2024-03-28T20:14:16Zhttp://i-rep.emu.edu.tr:8080/oai/request
oai:i-rep.emu.edu.tr:11129/42013-02-22T06:17:13Zhdl_11129_3
EMU I-REP
author
Naraghi, Nima Seif
2012-11-12T10:55:46Z
2012-11-12T10:55:46Z
2009
http://hdl.handle.net/11129/4
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.), Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2009. Supervisor: Assoc. Prof. Dr. Erhan Ince
ABSTRACT: Also the work entailed an effective shadow removal technique which is used to avoid detection of shadow pixels as part of the foreground mask.
The results show some critical tradeoffs between precision and speed of the process. For instance, although approximated median filtering seems to be a suitable approach due to its simplicity in computation, it fails to detect foreground objects accurately when the background scene contains movements, in addition it is slow in the case of adapting to frame changes which makes this algorithm impractical for many outdoor applications.
The results of progressive method indicate that the algorithm is able to handle the adaptation or deal more effectively than approximated median filtering with even better accuracy for foreground extracting in expense of slightly losing the performance speed. However, the background movement problem (shaking leaves, flag in the wind, flickering, etc) still stands.
Mixture of Gaussians based results was promising in both adaptation and precision however the method’s sensitivity to transient stops and its heavier computational complexity were its main drawbacks. Finally although the group based histogram was still too sensitive to fluctuation of light it led to acceptable results introducing itself as a reliable background-foreground segmentation method for its ability to deal with transient stops. Keywords: Temporal Median Filtering,Background estimation,Mixture of Gaussians background estimation, Median filtering, Histogram, Precision and recall, Shadow removal. ……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bir video dizinini oluşturan çerçevelerdeki hareketli nesnelerin bölütlenmesi birçok video tabanlı sistem için temel bir adım teşkil eder. Bu uygulamalardan bazıları aşagıdaki gibi sıralanabilir: kestirim ve tanıma, bina içi veya dışı ortamlarda nesne sınıflandırması, trafik akış hesaplaması, şerit doluluk analizi, kaza algılama vb. İzlenen alandaki nesnelerin sağlıklı takibi için güvenilir ve etkili arkaplan tahmin ve ayrıştırma üniteleri gerekmektedir. Bütün yönleri ile iyi bir algoritma geliştirmek hemen hemen imkansızı istemek gibidir. İlk olarak seçilen yöntemler aydınlatmada meydana gelebilecek değişikliklere karşı dayanıklı olmalıdır. Daha sonra algoritmalar sabitliği devamlı değişen nesneleri (sallanan ot ve yapraklar, yağmur ve kar gibi) arka planın bir parçası olarak almamalıdırlar. Ayrıca algoritmalar güneş ışığının bloke edilmesinden oluşan hareketli gölgeleri de arka plandan ayırabilmelidirler. Son olarak şehir içi trafiğinde sıkça karşılaşılan durma ve hareket etmelere karşı arka planı hızlı bir şekilde adapte edebilmelidirler. Bu yüzden yüksek doğruluk ve hesaplama karmaşıklığının gerçek zamanlı çalışacak kadar az olması önemli noktaları teşkil etmektedir. Bu tezde dört ayrı arkaplan çıkarma algoritmasına (background subtraction algorithms) odaklanılmıştır. Literatürde en çok referans almış ve iyi benzetim sonuçları veren yöntemler seçilmiş ve gerçekleştirilmiştir. Bu beş yöntem sırası ile yaklaşık ortanca süzgeçleme yöntemi, Gauss fonksiyonları karışım modeli, aşamalı arka plan kestirim yöntemi ve histogram/grup-tabanlı histogram yöntemleridir. Bu teknikler farklı ortamlar için değişik test video dizinleri kullanarak değerlendirilmiş ve ayrıca sentetik video dizinleri kullanılarak kıyaslamalı olarak karşılaştırılmıştır. Ayrıca, etkili bir gölge kaldırma tekniği tanıtılıp tahmini önplanlara uygulanmıştır. Sonuçlar işlemin kesinliği ve hızı arasında bazı kritik ödünleşimler göstermiştir. Örneğin approximated median filtering hesaplamadaki kolaylığı sebebiyle uygun bir yaklaşım olarak görülse de geri plandaki mekan hareket içerdiği taktirde önplandaki nesneleri doğru olarak tespit edememektedir. Ayrıca bu yöntem, çerçeve değişimlerine uyumu açısından da yavaştır ki bu durum sozkonusu algoritmayı birçok dış uygulama için kullanışsız kılmaktadır. Aşamalı arkaplan kestirim algoritmasıyla elde edilen sonuçlar göstermektedir ki bu algoritmanın adapte olma becerisi yaklaşık ortanca süzgeçli yönteme göre daha etkilidir. Çok az hız kaybına rağmen önplan çıkartması daha kesin bir biçimde yapılabilmektedir. Buna rağmen geri plan hareket problemi hala (sallanan yapraklar, dalgalanan bayrak, titreme, vb) devam etmektedir. Gauss fonksiyonları karışımlı arkaplan kestirim yöntemi keskinlik ve adaptasyonda iyi olmasına rağmen geçici duraklama ve kalkışlara hassas ve işlem zamanı açısından daha uzun bir zaman aralığı gerektiren bir yöntemdir. Son olarak, grup temelli histogram yöntemi ışık dalgalanmalarına karşı çok hassas olmasına karşın duraklama ve kalkmalara karşı başarılı olması nedeni ile güvenilir ve başarılı bir önplan-arkaplan bölütleme yöntemi olarak kabul edilebilir.
Anahtar kelimeler: zamansal ortanca süzgeçleme, aşamalı arkaplan kestirimi, Gauss fonksiyonları karışımlı arkaplan kestirimi, keskinlik ve hatırlama ölçekleri, gölge belirleme ve kaldırma.
en
Eastern Mediterranean University
Electrical and Electronic Engineering
Temporal Median Filtering
Background Estimation
Mixture of Gaussians Background Estimation
Median Filtering
Histogram
Precision and Recall
Shadow Removal
A Comparative Study of Background Estimation Algorithms
Thesis
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oai:i-rep.emu.edu.tr:11129/572013-02-22T06:54:16Zhdl_11129_3
EMU I-REP
author
Yeganli, Faezeh
2012-11-29T12:32:54Z
2012-11-29T12:32:54Z
2010
Yeganli, Faezeh. (2010). A Design of Q-shift Filter for Dual-Tree Complex Wavelet Transforms. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/57
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2010. Supervisor: Prof. Dr. Runyi Yu.
ABSTRACT: In this work a new method of designing filter for Dual-tree complex wavelet
transform is presented. In the new method, the space of orthonormal wavelet filters is
defined in terms of some parameters, these parameters are used to design Q-shift filters
to have desirable properties including good smoothness and support in [-2p/3, 2p/3]. The
constraints in parameterization method lead to wavelets having two vanishing moments.
For obtaining the group delay of 1/4 sample period and minimizing the magnitude or
energy in stop band [2p/3, p], Kingsbury minimized the energy in this domain. In the
proposed method in this work, we minimized the peak magnitude of filters in the stop
band. The design approach is illustrated with four examples. The results are compared
with Kingsbury’s Q-shift in ana lyticity measures, shift-invariance property and halfsample delay.
The designed filters are then used in image denoising. We used the Bivariate
shrinkage algorithm for wavelet coefficient modeling and thresholding. Three images
(Boat, Baboon, and Cameraman) have been used for test. The experimental results are
compared with those obtained using Kingsbury’s Q-shift filters. Keywords: Dual-tree complex wavelet transforms, Q-shift filters, Orthogonal wavelets, Parameterization, Image denoising. ……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu çalismada Ikili agaç kompleksi dalgacik dönüsümü için filtre tasarlamanin yeni bir yöntemi sunulmaktadir. Yeni yöntemde ortonormal dalgacik filtrelerinin alani parametrelerle belirlenmektedir, sonra bu parametreler iyi pürüzsüzlük ve [-2p/3, 2p/3]’de destek de dahil istenen özelliklere sahip Q-shift filtrelerinin tasarlanmasinda kullanilmaktadir. Parametrizasyon yöntemindeki kisitlar dalgaciklarin iki kaybolma hareketine sahip olmasina neden olmaktadir. 1/4 örnek periyodunun grup gecikmesini elde etmek ve [2p/3, p]’de istenmeyen büyüklük veya enerjiyi asgariye indirmek için Kingsbury bu alandaki enerjiyi minimize etmistir. Bu çalismada önerilen yöntemde filtrelerin tepe büyüklügünü söndürme kusaginda minimize ettik. Sekilli örnekler tasarimin yaklasimini göstermektedir ve sonuçlar çözümleyicilik ölçümünde ler, shift-degismezlik özelliginde ve yarim örnek gecikmesinde Kingsbury’nin Q-shift’i ile karsilastirilabilirdir. Tasarlanan filtreler görüntü gürültüsüzlestirmede kullanilmaktadir. Dalgacik
katsayi modellemesi ve esiklemesi için iki degiskenli fire algoritmasini kullandik. Test için üç image (Kayik, Babun ve Kameraman) kullanilmistir ve deneysel sonuçlar Kingsbury'nin Q-shift filtrelerinin kullanilmasiyla elde edilenlerle karsilastirilmistir.
Anahtar sözcükler: Ikili agaç kompleksi dalgacik dönüsümü, Q-shift filtresi, Ortogonal dalgaciklar, Parametrizasyon, Görüntü gürültüsüzlestirme.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Image processing - Digital techniques
Dual-tree complex wavelet transforms - Q-shift filters
Orthogonal wavelets - Parameterization - Image Denoising
A Design of Q-shift Filter for Dual-Tree Complex Wavelet Transforms
Thesis
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oai:i-rep.emu.edu.tr:11129/682013-03-04T06:19:35Zhdl_11129_3
EMU I-REP
author
Al Hassan, Falah
2012-11-30T06:58:21Z
2012-11-30T06:58:21Z
2011
Al Hassan, Falah. (2011). A Transformerless Step-Up DC-DC Converter. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/68
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2011. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: In distributed generation (DG) systems, interfacing photovoltaic (PV) energy based sources to the grid poses a number of problems. Nowadays, transformerless converters are preferred for higher efficiency, low size and cost. Such a converter has its own problems. The output voltage of PV arrays is relatively low, requiring a high step-up converter to obtain the DC voltage input of the inverter.
In this project, a new step up converter proposed in a recent work [1], is analyzed, designed, simulated with MATLAB Simulink and practically implemented. Besides, the performance and effectiveness of some standard and improved boost converter circuits are discussed and compared in terms of voltage gain, power loss and switch voltage stress requirement. In fact, those performances are examined with deriving formulas and equations of current, voltages, power loss and voltage gain.
A major aim of the project is to investigate the effectiveness of this converter regarding application in DG systems. The improved effectiveness due to the lower power loss invoked with such a converter, which at the same time possesses a high voltage step up gain and a lower switch voltage stress compared to the standard boost converter. These characteristics together are attractive feature for use with DG systems. Keywords: Transformerless, Boost Converter, Voltage Gain, DG Systems. …………………………………………………………………………………………………………………………………………………………………………………………………………………… ÖZ: Dağıtılmış üretim sistemlerinde (DÜS), güneş pilleri temelli enerji sistemlerini elektrik şebekesine bağlamak sorunlari yaratmaktadır. Günümüzde, trafosuz çevirgeçler yüksek verimlilik, düşük hacim ve maliyet gerekçeleri ile tercih edilmektedir. Fakat, böyle bir çevirgeçin de kendine göre sorunları vardır. Güneş pil dizilerinin çıkış gerilimleri genellikle düşüktür veçevirgeçin giriş gerilimini elde etmek için yüksek kazançlı bir DC-DC çevirgeçe ihtiyaç vardır. Bu projede, yakın zamanlarda önerilen yeni bir yükselticinin analizi, tasarımı, MATLAB Simulinkle simülasyonu ve deneysel uygulaması yapılmıştır. Bunun yanında, bazı standard ve iyileştirilmiş çevirgeç devrelerinin performans ve etkinlikleri tartışılıp, kazanç, güç kaybı ve anahtar üzerindeki gerilim baskısı bakımından karşılaştırmaları yapılmıştır. Bu çevirgeçlerin performansları, akım gerilim ve güç kaybı denklemleri elde edilerek değerlendirildi. Bu projenin başlıca amacı bu tip yükselteçlerin DÜS uygulamaları bakımından etkinliğini araştırmaktır. Bu çevirgeçlerin standard yükselticilere göre iyileştirilmiş etkinliği daha yüksek gerilim kazancı ve daha düşük anahtar gerilimi baskısından kaynaklanmaktadır. Bunlar DÜS’lerde uygulama için çekici özelliklerdir.
Anahtar kelimeler: Trafosuz, Yükseltici Çevirgeç, Gerilim Kazancı, Dağıtılmış Üretim Sistemleri.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Transformerless - Boost Converter - Voltage Gain - DG Systems
DC-to-DC converters
A Transformerless Step-Up DC-DC Converter
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/732012-12-25T13:39:36Zhdl_11129_3
EMU I-REP
author
Mayyala, Qadri Ahmad
2012-11-30T07:42:12Z
2012-11-30T07:42:12Z
2012
Mayyala, Qadri Ahmad Ata. (2012). Adaptive Equalization for Periodically VaryingFading Channels. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/73
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Osman Kükrer.
The problem of identification and tracking of periodically varying systems is
considered. Multipath fading channel imposes significant constraints and limitations
on wireless communication applications. When the multipath is caused by a few
strong reflectors, the channel behaves as a system with poly-periodically timevarying
response. The channel impulse response is then modeled by a linear
combination of a finite set of complex exponentials whose frequencies are termed by
Doppler frequencies. This model is well-motivated in radio cellular telephony and
aeronautical radio communication.
While the system coefficients start varying rapidly in time, the commonly used
adaptive least mean squares (LMS) and weighted least squares (WLS) algorithms are
unable to track the variations effectively. The key point is to employ basis functions
(BF) expansion algorithms, which are more specialized adaptive filters.
Unfortunately, this type of estimators is numerically very demanding and has a
limited mean square estimation error (MSE) performance.
This thesis explores two existing adaptive equalization algorithms, namely,
exponentially weighted basis function (EWBF), gradient basis function Gradient-BF,
and contributes by proposing a new efficient BF estimator termed as recursive
inverse basis function (RIBF) estimator. Furthermore, a frequency-adaptive version
of RIBF estimator is derived. Computer simulations are carried out, using Matlab
software package, to evaluate the proposed RIBF estimator performance. The new
BF estimator outperforms the EWBF estimator by large computational complexity savings. Moreover, RIBF is superior to the Gradient-BF and EWBF estimators since
it shows further reduction in the mean square parameter estimation error. These
advantages results in significant gains when applied in wireless communications to
reduce BER, SNR and channel bandwidth requirements.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Wireless Communication Engineering
Communication Networks
Basis Function Algorithms - Systems identification - Nostationary Processes
Periodicaly Varying Systems - Adaptive Filters
Adaptive Equalization for Periodically VaryingFading Channels
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/1142012-12-25T14:21:55Zhdl_11129_3
EMU I-REP
author
Attaei, Yazdan Mehdipour
2012-12-03T06:45:23Z
2012-12-03T06:45:23Z
2012
Attaei, Yazdan Mehdipour. (2012). Current Distribution on Linear Thin Wire Antenna Application of MOM and FMM. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/114
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Haluk U. Tosun.
Numerical techniques in solving electromagnetics problems are the most common methods which are used during the last decades, especially with the growing inventions of fast speed computers and powerful softwares. In this thesis, it is attempted to approach a fast efficient algorithm for solving the famous Hallen and Pocklington integral equations, regarding the current distribution on a finite-length linear thin wire antenna.
In order to approach this aim, Method of Moments (MOM) which is a powerful numerical technique to solve integral equations and Fast Multipole Method (FMM) which is a mathematical technique to accelerate iterative solutions is to be combined. Afterward, this technique will be applied on Hallen and Pocklington’s integral equations (HE and PE) for a transmitting thin wire antenna which is energized by delta-function generator (DFG) in order to find current distribution along the antenna.
In the thesis, there would be a discussion part about solvability and non-solvability of HE and PE equations and comparison between the results using this technique and the ones which have been extracted by applying the other methods mentioned in different books for solving HE and PE equations in frequency domain.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Antennas (Electronics)
Current Distribution - Thin Wire Antenna - Hallen's Integral Equation
Pocklington's Integral Equation
Glerkin Method - Entire Domain Basis Function - Fast Multipole Method
Current Distribution on Linear Thin Wire Antenna Application of MOM and FMM
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F114/3/Attaei.pdf.txt
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oai:i-rep.emu.edu.tr:11129/1162012-12-25T14:23:34Zhdl_11129_3
EMU I-REP
author
Shahrara, Reza
2012-12-03T06:57:24Z
2012-12-03T06:57:24Z
2011
Shahrara, Reza. (2011). Design and Implementation of a Microcontroller Based Wireless Energy Meter. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/116
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2011. Supervisor: Prof. Dr. Nuri Süha Bayındır.
Efficient use of energy becomes more crucial when increase in the cost of energy is observed. Since energy management is required to define the amount of consumed energy in a specific period of time, utilization of Energy Meters is essential. It is possible to measure the consumed energy by using a simple energy meter. But sometimes the limited functionality of these meters restricts their area of application; especially in inaccessible positions or in the situations where visibility of the meter is poor, it is not possible to use such an appliance. A possible solution is a Wireless Energy Meter (WEM) which is able to send its data via wireless communication to a PC where monitoring and analysis of the data will be easily made. This measurement system is aimed to be used in measuring energy related quantities of transformers and high voltage towers at remote locations. This document describes the design and implementation of a digital Wireless Energy Meter (WEM) based on AVR microcontroller. Calculation of the phase difference between current and voltage using Zero Cross Detection capability of the microcontroller is a distinct feature of this project. Hall Effect Sensor is used to measure the current signal and a resistive voltage divider is used to measure the voltage.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Energy Meter - Wireless - AVR Microcontroller - Hall Effect Sensors
Resistive Voltage Divider - Zero Cross Detection
Electric measurements
Design and Implementation of a Microcontroller Based Wireless Energy Meter
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F116/3/Shahrara.pdf.txt
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URL
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oai:i-rep.emu.edu.tr:11129/1612012-12-26T06:32:52Zhdl_11129_3
EMU I-REP
author
Bolourchi, Pouya
2012-12-05T09:29:02Z
2012-12-05T09:29:02Z
2012
Bolourchi, Pouya. (2012). Intelligent Decision Making Based on Fuzzy Logic System in Remote Wireless Communication. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/161
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: Wireless sensor networks (WSNs) consist of a large number of sensor nodes. The
sensors are tiny devices, which are easy to manufacture, low cost and very power efficient. The major objective of this thesis is to use WSNs in intelligent decision making based on the collected data. Intelligent decision making has important application especially in autonomous systems used in homeland security, health care improvement, wildlife monitoring, environmental surveillance, climate research and natural disaster – crises management. The main advantage and growing significance of intelligent decision making is the elimination of human factor which makes it reliable, conformable, adoptable and a major player in energy management of remotely located autonomous systems. The focus of this thesis is to design a system to make an intelligent decision based on the five levels of sensitivities introduced by Uysal et al [2]. In designing such a system, we will consider some parameters like power consumption, total cost and efficiency of the system in comparison to the PLCs developed by companies such as Siemens and Mitsubishi. For software implementation among the available techniques, we have chosen one that has a faster processing method in comparison to computational methods that are widely used in the processors. We introduce Fuzzy logic system, which is a very powerful method, commonly used in control systems, and can be easily simulated in MATLAB Toolbox.
Keywords: Intelligent decision making, wireless sensor network, fuzzy logic,
security system, PLC component.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Kablosuz Sensör Ağları çok sayıdaki sensör düğümlerinden oluşmaktadır. Sensörler, üretilmesi kolay, üretim maliyeti düşük ve yüksek güç performansına sahip cihazlardır. Bu tez çalışmasının temel amacı, Kablosuz Sensör Ağları’nın toplanmış olan verilere dayalı akıllı karar verme sistemlerinde kullanılmalarından ibarettir. Akıllı karar verme sistemleri, özellikle ülke güvenliği, sağlık sistemlerinin geliştirilmesi, vahşi hayatın izlenmesi, çevre gözetimi, iklim araştırmaları ve doğal felaket-krizlerin yönetiminde kullanılan özerk sistemlerde olmak üzere önemli uygulama alanlarına sahiptir. Akıllı karar verme sistemlerinin asıl avantajları ve büyümekte olan önemi, bu sistemleri güvenilir, uygun, uyarlanabilir ve uzakta yerleştirilen özerk sistemlerin enerji yönetiminde önemli bir rol üstlenen sistemler haline gelmesine neden olan insan faktörünün ortdan kaldırılmış olmasıdır. Bu tez çalışması, Uysal ve diğerleri [2] tarafından tanımlanan beş duyarlılık düzeyine
dayanan akıllı bir kararın alınmasını mümkün kılacak bir sistemin tasarlanması üzerinde yoğunlaşmakatdır. Böyle bir sistemin tasarlanması sırasında, Siemens veya Mitsubishi gibi firmalar tarafından geliştirilen PLC sistemleri ile karşılaştırmalı olarak söz konusu olan sistemin güç tüketimi, toplam maliyeti ve verimi gibi parametreler incelenmektedir. Yazılım uygulaması konusunda ise mevcut olan teknikler arasından, yaygın bir şekilde işlemcilerde kullanılmakta olan hesaplamalı yöntemlere nazaran daha yüksek işleme hızına sahip olan bir teknik seçilmiştir. Bu çalışmada oldukça güçlü bir yöntem olup genellike kontrol sistemlerinde kullanılan ve MATLAB Toolbox’dan yararlanılarak kolaylıkla simülasyonu yapılabilen Bulanık Mantık sistemi tanıtılmıştır.
Anahtar Kelimeler: Akıllı karar verme, kablosuz sensör ağları, bulanık mantık,
güvenlik sistemi, PLC bileşeni.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Fuzzy logic - Wireless Communication - Engineering Mathematics
Digital control Systems
Intelligent Decision Making - Wireless Sensor Network - Fuzzy Logic - Security System - PLC Component
Intelligent Decision Making Based on Fuzzy Logic System in Remote Wireless Communication
Thesis
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oai:i-rep.emu.edu.tr:11129/1722012-12-26T06:44:09Zhdl_11129_3
EMU I-REP
author
Nurellari, Edmond
2012-12-07T12:01:55Z
2012-12-07T12:01:55Z
2012
Nurellari, Edmond. (2012). LDPC Coded OFDM And It’s Application To DVB-T2, DVB-S2 And IEEE 802.16e. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/172
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT: Since the invention of Information Theory by Shannon in 1948, coding theorists have been trying to come up with coding schemes that will achieve capacity dictated by Shannon’s Theorem. The most successful two coding schemes among many are the LDPCs and Turbo codes. In this thesis, we focus on LDPC codes and in particular their usage by the second generation terrestrial digital video broadcasting (DVB-T2), second generation satellite digital video broadcasting (DVB-S2) and IEEE 802.16e mobile WiMAX standards. Low Density Parity Check (LDPC) block codes were invented by Gallager in 1962 and they can achieve near Shannon limit performance on a wide variety of fading channels. LDPC codes are included in the DVB-T2 and DVB-S2 standards because of their excellent error-correcting capabilities. LDPC coding has also been adopted as an optional error correcting scheme in IEEE 802.16e mobile WiMAX.
This thesis focuses on the bit error rate (BER) and PSNR performance analysis of DVB-T2, DVB-S2 and IEEE 802.16e transmission using LDPC coding under additive white Gaussian noise (AWGN) and Rayleigh Fading channel scenarios. The power delay profile for all transmissions was adopted from the ITU channel model. For modelling the fading environment, Jakes fading channel model[7] together with ITU Vehicular-A and ITU Vehicular-B[13] power delay profile parameters were used considering also the Doppler effect. The three scenarios presented in this thesis are the following: (i) simulation of LDPC coding for DVB-S2 standard, (ii) optional LDPC coding as suggested by the WiMAX standard and (iii) simulation of DVB-T2 using LDPC without outer BCH encoder and with outer BCH encoder. During the simulations the encoding algorithm used was the Forward Substitution algorithm. Even though the second generation DVB standards and WiMAX standard has been out since 2009, not many comparative results have been published for BCH and LDPC concatenated coding schemes making use of either a normal FEC frame or a shortened FEC frame. By carrying out the work presented here we tried to contribute towards this end. Throughout the simulations, we have considered two different size images as the source of information to transmit. Performance analysis have been presented by making comparisons between BER and PSNR values and psychovisually.
Keywords: Low Density Parity Check Coding; BCH coding; OFDM; WiMAX; Digital
Video Broadcasting; Rayleigh Fading Channel; Shortening; Zero-Padding; Digital Image
Processing; Iterative decoding.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ : 1948 de Shannon tarafından bilişim kuram geliştirildikten sonra, bir çok kodlama kuramcısı
Shanon teoreminde dikte edilen kapasiteye ulaşabilmek için farklı kodlama yöntemleri tasarlamışlardır. Bunlar arasında en başarılı alan ikisi, düşük yoğunluklu eşlik kontrol (DYEK)
kodları ve Turbo kodlarıdır. Bu tezde ilgi odağı DYEK kodları ve bu kodların ikinci nesil yerüstü sayısal video yayıncılığı (DVB-T2), ikinci nesil uydu sayısal video yayıncılığı (DVBS2) ve IEEE 802.16e mobil iletişim alanına uyarlanması olacaktır. Düşük yoğunluklu eşlik kontrol kodları 1962 de Gallager tarafındar keşfedilmiş ve sönümlemeli kanallar üzerinde Shanon sınırına yakın performans elde ettikleri gözlemlenmiştir. Bu özelliklerinden dolayı DYEK kodları DVB-T2 ve DVB-S2 standartlarında yerlerini almış ve IEEE 802.16e mobil WiMAX standardında ise CC ve RS-CC kodlama yöntemleri yanında bir seçenek olarak kabul görmüştür. Bu tezde, bit hata oranı (BHO) ve tepe işaret gürültü oranı metrikleri kullanılarak DVB-T2, DVB-S2 ve IEEE 802.16e fiziki iletişim sistemlerinin toplanır beyaz Gaus gürültülü kanal ve sönümlemeli kanalla üzerindeki performans analizleri sunulmaktadır. Tüm senaryolarda kullanılan gecikme profili, ITU kanal modelinden alınmıştır. Sönümlemeli ortamı modelleme ise Jake kanal modeli ve ITU Taşıtsal- A ve Taşıtsal- B[13] güç¸ gecikme profillerini kullanarak yapılmıştır. Modelleme Dopler değişimlerini de göz önüne almıştır. Sunulan üç¸ senaryo aşağıdaki gibidir: (i) DYEK destekli DVB-S2 benzetimleri, (ii) seçmeli DYEK destekli WiMAX benzetimleri ve (iii) DYEK veya DYEK-BCH seri bağlı kodlama destekli benzetimler. Benzetim çalışmaları esnasında kullanılan kodlama algoritması ileri ornatımlı bir algoritma idi. Hem ikinci nesil sayısal video kodlama standardı, hem de WiMAX standardı, 2009 dan beri bilinmesine rağmen literatürde BCH ve DYEK kodlarını ardışık birleştiren ve hem normal FEC çerçevesi hem de kısaltılmış FEC çerçevesi kullanan benzetim çalışmaları bulunmadı ğından bu çalışmayla bu alanda katkı koymaya çalışılmıştır. Benzetim çalışmaları esnasında, boyutları farklı iki imge iletilmesi arzu edilen veri olarak kabul edilmiştir. Tezde, BHO, tepe sinyal gürültü oranı ve görüntüsel kaliteye bağlı kıyaslamalar sunulmaktadır.
Anahtar kelimeler: Düşük yoğunluklu eşlik kontrol kodları, BCH kodlama; OFDM;WiMAX;
Sayısal Video Yayıncılığı, Rayleigh sönümlemeli kanal; Kısaltma; sıfır dolgulama; sayısal
imge işleme; Özyineli kod çözümleme.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Orthogonal Frequency Division Multiplexing (OFDM)
Low Density Parity Check Coding--BCH Coding--OFDM
WiMAX - Digital Video Broadcasting - Rayleigh Fading Channel
Shortening - Zero-Padding - Digital Image Processing - Iterative Decoding
LDPC Coded OFDM And It's Application To DVB-T2, DVB-S2 And IEEE 802.16e
Thesis
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URL
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Nurellari.pdf
oai:i-rep.emu.edu.tr:11129/1732012-12-26T06:48:02Zhdl_11129_3
EMU I-REP
author
Monfared, Mostafa Arbabi
2012-12-07T12:19:52Z
2012-12-07T12:19:52Z
2012
Monfared, Mostafa Arbabi. (2012). Localization in Wireless Sensor Networks Based onFuzzy Logic. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/173
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: One of the fundamental problems in Wireless Sensor Networks (WSNs) is the
localization of sensor nodes based on the known location of several nodes. In this thesis one of the intelligent localization schemes, which is a range free localization is used to estimate the location of the unknown nodes. In the proposed method, the anchor nodes (reference nodes) are connected to the sensor nodes and then each sensor node receives the signal strength indicator (RSSI) from each of the anchor nodes. The RSSIs are achieved based on the distance of the sensor node to each of anchor nodes. The RSSIs are fed to the sugeno fuzzy inference system to calculate the weights used in the centroid relation. The centroid technique is the range free based
localization scheme, which is proposed to estimate the location of the sensor nodes. Both analytical and experimental approaches are considered where the analytical approach is done by sugeno fuzzy inference in the two different environments with and without Additive White Gaussian Noise (AWGN). The experimental method is done for 6 sensor nodes and repeated 6 times in different positions in a region. There is an error of locating the actual and the estimated nodes in both analytical and experimental approaches. The error of location of the estimated sensor nodes in the experimental method is not much in comparison with the analytical method.
Keywords: Range free localization, received signal strength indicator, centroid localization, fuzzy logic system and wireless sensor network.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Kablosuz Sensör Ağları (KSA) (“Wireless Sensor Networks” – WSNs - ) konusunda yaşanmakta olan temel sorunlardan biri, bilinen birkaç sensör düğümünün konumlarına istinaden sensör düğümlerinin lokalizasyonudur. Bu tez çalışmasında, bilinmeyen sensör düğümlerinin konumlarının tahmin edilmesi amacıyla, uzaklığa bağlı olmayan bir lokalizasyon yöntemi olan akıllı lokalizasyon planlarından biri kullanılmaktadır. Önerilmekte olan yöntemde, referans sensör düğümleri diğer sensör düğümlerine bağlanmakta ve bundan sonraki aşamada her bir sensör düğümü Sinyal Güç Göstergesini (SGG) (“Signal Strength Indicator” – RSSI - ) her bir referans düğümünden almaktadır. Elde edilen Sinyal Güç Göstergeleri, sensor düğümünün her bir referans sensör düğümünden uzaklığına bağlı olmaktadır. Elde edilen Sinyal Güç Göstergeleri, ağırlık merkezi hesaplama bağıntısında kullanılmak amacıyla ağırlıkları hesaplanmak üzere Sugeno bulanık hesaplama ve sonuçlandırma sistemine verilmektedir. Ağırlık merkezi hesaplama tekniği, sensor düğümlerinin konumlarının tahmin edilmesi için önerilen ve uzaklığa bağlı olmayan baz lokalizasyon tekniklerinden biri olmaktadır. Bu çalışmada hem analitik hem de deneysel yöntemler dikkate alınmış olup analitik incelemeler, Beyaz Gauss Gürültülü (BGG) (“Additive White Gaussian Noise” – AWGN - ) ve Beyaz Gauss Gürültüsüz olmak üzere iki değişik ortamda Sugeno Hesaplama ve Sonuçlandırma Sistemi tarafından gerçekleştirilmiştir. Deneyler 6 sensör düğümü için yapılacak olup bir alandaki 6 farklı konumda tekrarlanacaktır. Hem analitik hem deneysel incelemeler sırasında düğümlerin gerçek konumları ile tahmin edilen konumları arasında bir hata bulunmaktadır. Deneysel çalışmalarda tahmin edilen her bir sensör düğümünün konumu ile gerçek düğüm konumu arasındaki fark analitik incelemeler ile karşılaştırıldığında çok büyük farklılıklar görülmamaktedır.
Anahtar Kelimeler: Uzaklığa bağlı olmayan lokalizasyon, Gelen sinyal güç göstergesi, ağırlık merkezi lokalizasyonu, bulanık mantık sistemi ve kablosuz sensor ağı.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Sensor networks
Digital Communication
Fuzzy logic - Engineering Mathematics
Range Free Localization - Received Signal Strenth Indicator
Centroid Localization - Fuzzy Logic System and Wireless Sensor Network
Localization in Wireless Sensor Networks Based onFuzzy Logic
Thesis
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oai:i-rep.emu.edu.tr:11129/1782012-12-26T06:51:25Zhdl_11129_3
EMU I-REP
author
Makvandi, Reza
2012-12-10T07:05:21Z
2012-12-10T07:05:21Z
2010
Makvandi, Reza. (2011). Microcontroller-based Implementation of ParseKey + for Limited Resources Embedded Applications. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/178
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2011. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: ParseKey+ is an approach to a new highly secure and safe authentication service.
The scheme provides secure authentication process for both client and server sides. It employs hash to hide the encrypted key in a key file retrievable only by the other side knowing the indices and lengths of sub-keys hidden inside ParseKey+ file. The ParseKey+ file itself is also encrypted by the password of the other party in authentication service using a symmetric encryption method. The key file is recreated at each sign-on procedure; it provides an additional security layer beyond using the login password. ParseKey+ avoids client and server impersonations while
guaranteeing mutual client/server authentication. Likewise, the ParseKey+ scheme avoids replay, meet-in-the-middle, ciphertext-only, and side-channel attacks. ParseKey+ relies on scattering sub-keys in a block of uniformly created random noise. We wish to implement the ParseKey+ authentication system with limited resources on AVR microcontrollers. More sophisticated versions of these families of microcontrollers are widely used in PDAs, new generation of mobile phones and various embedded devices. Implementation of ParseKey+ allows securing Internet communication and transactions on above-mentioned devices in addition to providing a highly secure mechanism for implementing very low-cost hardware USB keys for online banking applications.
Keywords: Microcontroller-based Authentication, Embedded System, ParseKey+
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ÖZ: ParseKey+ yeni, son derece güvenli bir kimlik doğrulama hizmet yaklasımıdır. Bu yaklaşım hem istemci hem de sunucu tarafı için güvenli kimlik doğrulama islemi sağlar. Hash kullanarak ParseKey+ dosyası içinde kilitlenmis olan kodlanmıs anahtarı sadece öteki taraftan endekseleri ve altanahtar uzunlukları bilenler tarafından alınabilir. ParseKey+ dosyasının kendisi de öteki partinin şifresi ile simetrik olarak kodlanmıştır. Her giriş işleminde anahtar dosya çağrılır; giriş kodu (password) kullanımına ilaveten artı bir güvenlik seviyesi sağlar. Karsılıklı istemci / sunucu kimlik doğrulaması garanti ederken ParseKey + istemci ve sunucu taklitleri önler. Aynı şekilde, ParseKey + düzeni tekrarı, ortada buluşmayı, şifreli-sadece ve yan kanal saldırılarını önler. ParseKey + düzgün oluşturulan rastgele gürültü bir blok saçılma alt anahtarlarına dayanmaktadır. Biz, sınırlı kaynaklara sahip AVR mikroislemcileri üzerinde ParseKey + kimlik doğrulama sistemi uygulamak istiyoruz. Mikroişlemcisi daha gelişmiş versiyonları yaygın PDA'lar, çesitli gömülü cihazlar ve yeni nesil cep telefonlarında kullanılmaktadır. ParseKey+ Uygulama online bankacılık uygulamaları için çok düşük maliyetli donanım USB anahtarları uygulanması için son derece güvenli bir mekanizma vermenin yanı sıra yukarıda bahsedilen cihazlarda internet iletişimi ve işlemlerinde güvenli olaral kullanılmaktadır.
Anahtar Kelimeler: Mikrodenetleyici tabanlı Doğrulama, Gömülü Sistem, ParseKey+
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Digital control systems - Microprocessors
Microcontroller-based authentication - Embedded System - ParseKey+
Microcontroller-based Implementation of ParseKey+ for Limited Resources Embedded Applications
Thesis
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oai:i-rep.emu.edu.tr:11129/1802012-12-26T07:09:34Zhdl_11129_3
EMU I-REP
author
Oyelami, Opeyemi Kazeem
2012-12-10T07:32:39Z
2012-12-10T07:32:39Z
2012
Oyelami, Opeyemi Kazeem. (2012). Modeling and Simulation of the Controllable Network Transformers. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/180
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: The work presented in this thesis looked into the working principle of the Controllable Network Transformer in controlling the flow of power through tie lines. It has always been difficult to control the power flowing through the tie lines that connect two areas. This causes a lot of stress on the power grid and makes it weak as time goes on. There had been a number of ways of controlling this flow of power and this has proven to achieve a limited amount of control. The previous method had made use of devices such as the Load tap Changing Transformers and Phase Shifting Transformers. The controllable transformer is introduced as a simple device that was realized by augmenting a fraction of a centre-tapped or a Linear Tap Changing transformer (LTC) with a small bidirectional low-rated AC-AC converter. The dual virtual quadrature sources (DVQS) scheme was also developed and used as against the conventional Pulse Width Modulation. This DVQS makes use of the Even Harmonic Modulation techniques (EHM) by injecting a series of voltage sources between the two buses to control both the magnitude and direction of the flow of power in the model. This thesis discussed the basics, modeling and theoretical analyses of the CNT extensively. The derived equations were then compared with results obtained from simulations using MATLAB simulink. The Simulations of the CNT Model was discussed extensively in Chapter Three. During the simulations, each elements of the model were tested to see their contributions to the model. It was also observed that there are huge amount of third harmonics in the circuit. These are unwanted, hence a third-harmonic trap was designed to reduce or remove the unwanted third harmonics in the circuit. The effect of the DC component K0 of the reference voltage, the second harmonic amplitude K2 and the phase angle φ on the Power output were also considered. The bidirectional control property of the CNT on the power flow was also considered. Finally, we also developed the Variable Structural System control of the CNT. This enabled us to analyze the full working principle of the CNT and the effect of the duty cycle d on the overall performance of the CNT model. The advantages and the shortcomings of the CNT as compared to the other power flow controller were also analyzed and discussed under the discussion section in Chapter 3.
Keywords: Controllable Network Transformer (CNT), Dual Virtual Quadrature Scheme (DVQS), Even harmonic modulation (EHM), Smart grid, Power flow control.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu tez, denetlenebilir şebeke trafosunun bir bağlantı hattı üzerinden geçen gücü kontrol etmesinin çalışma ilkeleri üzerinde durmaktadır. İki enerji tesis bölgesi arasındaki güç akışını denetlemek her zaman sorun yaratmıştır. Bu sorun şebeke üzerinde baskı yaratmakta ve onun kararlı çalışmasını zayıf hale getirmektedir. Bölgeler arası güç akışını denetlemek için bazı yöntemler uygulanmış, fakat kontrol edilebilen güç miktarı sınırlı olmuştur. Bu yöntemler yük altında kademe değiştiren trafolar (LTC) ve faz kaydıran trafolar kullanmaktadır. Denetlenebilir şebeke trafosu bu sorunları çözmek için önerilmiş basit yapıda bir cihaz olup, bir LTC ve düşük güçlü ve iki yönlü bir AA-AA çeviriciden oluşmaktadır. İkili sanal kaynak düzeneği (DVQS) ise geleneksel DGM (Darbe Genişliği Modülasyonu)’na alternatif olarak geliştirilip kullanılmaktadır. DVQS çift harmonik modülasyon yöntemini kullanıp iki taşıyıcı arasındaki güç akışının miktar ve yönünü kontrol etmek için bu ikisinin arasında bir dizi gerilim kaynağı oluşturmaktadır. Bu tez CNT’nin temel ilkeleri, modellenmesi ve kuramsal çözümlemelerini geniş bir biçimde tartışmaktadır. Elde edilen denklemler, MATLAB Simulink ile elde edilen sonuçlarla karşılaştırılmıştır. CNT modelinin benzetimleri 3’ncü bölümde geniş bir biçimde tartışılmıştır. Benzetim çalışmaları sırasında her eleman modele katkısını görmek için sınanmıştır. Ayrıca devrede büyük miktarlarda üçüncü harmonik olduğu gözlenmiştir. Bunlar istenmediğinden, devreden giderilebilmeleri için üçüncü harmonik tuzağı (süzgeçi) tasarlanmıştır. Referans işaretinin DA bileşeninin, ikinci harmonik tepe değeri K2’nin ve faz açısı φ’nin güç akışı üzerindeki etkileri de incelenmiştir. Ayrıca, CNT’nin iki yönlü güç akışını denetleme özelliği üzerinde de durulmuştur. Son olarak, CNT’nin yapısal değişken dizge modeli geliştirildi. Bu model bize CNT’nin çalışma ilkelerini daha iyi çözümleme, ve anahtar elemanlarının görev oranının (d) CNT’nin davranışına olan etkisini inceleme imkanı verdi. Diğer güç akış denetleyicilere göre CNT’nin avantaj ve sorunları da tartışılmıştır.
Anahtar sözcükler: Denetlenebilir Şebeke Trafosu, İkili sanal kaynak, Çift harmonic modülasyonu, Akıllı şebeke, Güç akışı kontrolu.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Electric Transformers
Electric Power Systems
Controllable Network Transformer (CNT) - Dual Virtual Quadrature Scheme (DVQS)
Modulation (EHM) - Smart Grid - Power Flow Control
Modeling and Simulation of the Controllable Network Transformers
Thesis
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oai:i-rep.emu.edu.tr:11129/1872012-12-26T07:27:53Zhdl_11129_3
EMU I-REP
author
Savaş, Merin
2012-12-10T12:28:59Z
2012-12-10T12:28:59Z
2009
Savas, Merin. (2009). Nonbinary Convolutional Coding For Multimedia Data Transmission. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/187
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2009. Supervisor: Assoc. Prof. Dr. Aykut Hocanın.
ABSTRACT: In this thesis, the performance of nonbinary convolutional coding technique is investigated and new nonbinary codes with better performance are proposed. Nonbinary convolutional coding technique is a coding technique which is similar to the binary convolutional codes with the same decoding strategy but they are designed for general nonbinary sources. The nonbinary convolutional coding technique is described and simulated under various channel conditions. Synthetic nonbinary source sequences are produced by using Markov processes. The channels used in the experimental simulations include additive white Gaussian noise (AWGN) and flat fading channel models. Coded image and video sequences are transmitted over the channels by using binary phase shift keying (BPSK) modulation technique. The Viterbi decoding algorithm is used for decoding the encoded sequences. Viterbi decoding employs hard and soft decision metrics. The soft metric is updated to include the source statistics. This enables the decoder to use the source redundancy for improved decoding performance. Results show that nonbinary convolutional coding which uses the source statistic is effective in reducing bit error rate (BER). New nonbinary convolutional coding is optimized to increase the code distance (). The optimized codes are shown to perform better at low BER.freedv.
Keywords: Error Control coding, Convolutional codes, Source metric.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu tezde, ikili olmayan evrişimsel kodlama tekniği incelenmiş ve daha yüksek başarımlı kodlar önerilmiştir. İkili olmayan evrişimsel kodlama tekniğinde, geleneksel evrişimsel kodlama tekniği ile aynı yöntem kullanılarak kod çözülmektedir. İkili olmayan kodlama, genel ikili olmayan veri kaynakları için tasarlanmakta ve bu tür kaynaklar için daha yüksek başarım sağlamaktadır. Bu tezde ikili olmayan evrişimsel kodlar incelenmiş ve farklı iletişim kanallarındaki çoklu-ortam veri iletim başarımı benzetimlerle gösterilmiştir. Sentetik ikili olmayan veri kaynakları Markov süreçleri kullanılarak üretilmiş ve hata düzeltme başarımı geliştirilmiş kodlar benzetimlerle gösterilmiştir.
Yapılan deneylerde, kanal modelleri olarak Toplanır Beyaz Gauss Gürültü (TBGG) ve düz sönümlemeli kanal modelleri kullanılmıştır. Kodlanan resim ve video verileri kanal üzerinden İkili Evre Kaydırmaları Anahtarlama (İEKA) modülasyon tekniği kullanılarak iletilmiştir. Kodlanan dizileri çözmek için Viterbi kod çözme algoritması kullanılmıştır. Viterbi algoritması kod çözme işleminde ikili veya yumuşak ölçüt kullanmaktadır. Önerilen kodlarda, yumuşak ölçüt, kaynak istatistiklerini de kullanarak güncellenmiştir. Bunun sonucu olarak kod çözücü kaynak artıklığını da kullanarak başarımını artırmıştır. Sonuçlar ikili olmayan evrimşimsel kodlamada kaynak istatistiğinin kullanımının bit hata oranını düşürmede etkili olduğunu göstermektedir.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Data Transmission Systems
Digital Communications
Error - Correcting Codes (Information theory)
Digital Communication Systems - Error-Correcting Codes
Error Control Coding - Convolutional Codes - Source Metric
Nonbinary Convolutional Coding For Multimedia Data Transmission
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F187/3/Savas.pdf.txt
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oai:i-rep.emu.edu.tr:11129/1952012-12-26T07:32:20Zhdl_11129_3
EMU I-REP
author
Aghajamaliaval, Peyman
2012-12-11T09:16:36Z
2012-12-11T09:16:36Z
2011
Aghajamaliaval, Peyman. (2011). Power Control in DS-CDMA Forward Linkin Mobile Channels. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/195
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2011. Supervisor: Assoc. Prof. Dr. Aykut Hocanın.
ABSTRACT: In this thesis, performance of Direct Sequence Code Division Multiple Access (DS-CDMA) in wireless cellular communication system is investigated using Closed Loop Power Control (CLPC).Power control is significant in a DS-CDMA system, which is to reduce Multiple Access Interference (MAI) and near-far problems. In CDMA, the entire mobile users share the same frequency band simultaneously. Hence, they all interfere with one another. The significance of CLPC
is to maintain the received signal strength at the desired level. The desired values are set by Base Station(BS) in order to keep the Bit-Error-Rate(BER)at anacceptable level with minimum possible transmission power.System performance is demonstrated with BER comparisons. It is shown that CLPC optimizes transmission powersand improves the capacity of the system. The proposed power control scheme is based on estimated signal strengths. The performance of CLPC algorithm and the
DS-CDMA system is examined in AWGN and fading channels. The simulations are implemented on MATLABsoftware environment.
Keywords: Wireless cellular communication systems, DS-CDMA, Closed Loop Power Control.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu tezde, kablosuz hucresel haberleşme sistemi olan Doğrudan Dizili Kod Bolmeli Coklu Erişim (DD-KBÇE) başarımı Kapalı Cevrim Guc Denetimi (KÇGD) kullanılarak incelenmiştir. Güç denetimi Çoklu Eerişim Girişimi (ÇEG) ve Yakın- Uzak sorunlarını azaltmak için DD-KBÇE sistemlerinde DD-KBÇE kullanılmaktadır. DD-KBÇE sistemlerinde tum mobil kullanıcılar aynı frekans bandını paylaşmaktadırlar. KÇGD denetiminin amacı alınan sinyal gucu dengesini
sağlamaktır. İstenen sinyal gucu değerleri Yer İstasyonu (Yİ) tarafından en az Bit Hata Oranı (BHO) göz onune alınarak belirlenmektedir. Sistem başarımı BHO karşılaştırmaları kullanılarak incelenmiştir.KÇGD iletim güçlerini denetleyerek sistemin kapasitesini artırmaktadır. Önerilen güç denetim sistemi kestirilen sinyal güçlerine göre belirlenmektedir. KÇGD algoritması ve DD-KBÇE sisteminin başarımı AWGN ve sönümlemeli kanallarda incelenmiştir. Benzetimler MATLAB
yazılımı kullanılarak gercekleştirilmektedir.
Anahtar Kelimeler: Kablosuz hucresel haberleşme sistemleri, DD-KBÇE, Kapalı
Devre Güç Denetimi.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Wireless Communication - Mobile Communication Systems
Direct Sequence Code Division Multiple Access (DS-CDMA) - Power Control
Wireless Cellular Communication Systems - DS-CDMA - Closed Loop Power Control
Power Control in DS-CDMA Forward Linkin Mobile Channels
Thesis
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oai:i-rep.emu.edu.tr:11129/1962012-12-26T07:32:48Zhdl_11129_3
EMU I-REP
author
Feiz, Hossein
2012-12-11T09:24:56Z
2012-12-11T09:24:56Z
2012
Feiz, Hossein. (2012). Power Load Optimization in a Wireless Communication System in Remote Area. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/196
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: Obtaining the maximum power is a very important issue in self-powered wireless systems, especially for those fed by solar panels. Solar energy is one of the most significant renewable energy sources which has no pollution and does not make any noise, and because of these advantages using solar energy is increasing rapidly. This thesis is written under the research project called Integrated Homeland Security Surveillance System (IHSSS). IHSSS is a multipurpose security surveillance system fed by solar energy; this thesis follows the project limitation and objectives. In systems which use photovoltaic (PV) panels as power source, obtaining the maximum power is essential. There are many methods to optimize energy drawn by solar panels; maximum power point tracking (MPPT) is one of the methods which widely used to optimize system performance. There are also several algorithms for maximum power point tracking, but each of those methods has its own problems in speed and accuracy, and they couldn’t improve both factors simultaneously. Among those methods, Hill Climbing method has the most acceptable speed and accuracy, but still can’t deliver both factors simultaneously. In this thesis, we propose to employ novel techniques to improve the optimum power tracking using the Hill Climbing method. MATLAB/Simulink simulation platform will be used for the simulation. The current work can also be used in other applications using photovoltaic technology, especially in MPPT.
Keywords: solar panel, photovoltaic, maximum power Point tracking, power optimization, wireless communication system, renewable energy.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Özellikle güneş panelleri tarafından beslenen sistemler olmak üzere, kendi kendini besleyen kablosuz sistemlerde , maksimum gücün elde edilmesi oldukça önemli bir konuyu oluşturmaktadır. Güneş enerjisi, herhangi bir kirliliği olmayan ve hiçbir gürültüye neden olmayan en önemli yenilenebilir enerji kaynaklarından biri olup bu avantajlarından dolayı güneş enerjisinin kullanımı hızlı bir şekilde artmaktadır. Bu tez çalışması Entegre Ülke Güvenlik Gözetleme Sistemi (EÜGS) (Integrated Homeland Security Surveillance System – IHSSS -) konulu araştırma projesi kapsamında hazırlanmıştır. EÜGS güneş enerjisi ile beslenen çok amaçlı bir gözetleme sistemi olup bu tez çalışması proje sınırlamaları ve amaçlarını takip etmektedir. Güç kaynağı olarak güneş panellerini kullanan sistemlerde maksimum gücün elde edilmesi gerekmektedir. Güneş panelleri tarafından üretilen enerjinin iyileştirilmesi için birçok yöntem mevcut olup Maksimum Güç Noktası İzmele Yöntemi (MGNİY) (Maximum Power Point Tracking – MPPT-) sistem performansının iyileştirilmesi için oldukça yaygın bir şekilde kullanılan bir yöntemdir. Ayrıca maksimum güç noktasının izlenmesi için birçok algoritma kullanılmakta olup ancak bu yöntemlerin her birinin hız ve doğruluk açılarından kendine özel problemleri bulunmakta ve aynı zamanda her iki faktörü sağlayamamaktadırlar. Bu tez çalışmasında Yüksek Tırmanış Yöntemi (Hill climbing Method ) kullanılarak optimum güç izleniminin geliştirilmesi için yenilikçi tekniklerin kullanılması amaçlanmaktadır. Simülasyon için MATLAB/SIMULINK platformu kullanılmıstır. Bu çalışma özellikle Maksimum Güç İzleme olmak üzere güneş enerjisinden yararlanan diğer uygulamalarda da kullanılabilmektedir.
Anahtar Kelimeler : Güneş paneli, fotovoltaik, maksimum güç izleme, güç optimizasyonu, kablosuz haberleşme sistemi, yenilenebilir enerji.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Solar Energy - Power - Wireless Communication
Electric power systems - Solar Energy - Wirelless Communication
Solar Panel - Photovoltaic - Maximum Power Point Tracking
Power Optimization - Wireless Communication System - Renewable Energy
Power Load Optimization in a Wireless Communication System in Remote Area
Thesis
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oai:i-rep.emu.edu.tr:11129/2062012-12-26T07:37:23Zhdl_11129_3
EMU I-REP
author
Ahmad, Mohammad Mustafa Shukri
2012-12-12T13:50:10Z
2012-12-12T13:50:10Z
2011
Ahmad, Mohammad Mustafa Shukri. (2011). Recursive Inverse Adaptive Filtering Techniques And Applications. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/206
Doctor of Philosophy in Electrical and Electronic Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2011. Supervisor: Assoc. Prof. Dr. Aykut Hocanın.
ABSTRACT: Adaptive filtering techniques are widely used to cope with the variations of system parameters. In finite impulse response (FIR) adaptive filtering, the filter weights are updated iteratively by minimizing the mean-square-error (MSE) of the difference between the desired response of the adaptive filter and its output. However, most of the existing adaptive filters experience many difficulties; fixed-step size which provides poor performance in highly correlated environments, high computational complexity, stability due to the inversion of the autocorrelation matrix, tracking ability in non-stationary and impulsive noise environments. The novelty of this work resides in the derivation of a new FIR recursive inverse (RI) adaptive filtering algorithm. This algorithm has been proposed to overcome some of the difficulties experienced with the existing adaptive filtering techniques. The approach uses a variable step-size and the instantaneous value of the autocorrelation matrix in the coefficient update equation that leads to an improved performance. Avoiding the use of the inverse autocorrelation matrix, as the case of the recursive-least-squares (RLS) algorithm, would provide more stable performance. Convergence analysis of the algorithm has been presented. The ensemble-average learning curve of the RI algorithm is derived and compared with those of the RLS and least-mean-square (LMS) algorithms. A general fast implementation technique, which significantly reduces the computational complexity, of the RI algorithm is presented. A robust version of the RI algorithm, which leads to an improved performance, in impulsive noise environments is presented. The effect of the forgetting factor on the performance of the RI algorithm is investigated. Also, a twoiii dimensional (2D) version of the RI algorithm is introduced. Finally, a second-order version of the RI algorithm, which provides further improvement in the performance, is derived. The performance of the RI, fast RI, proposed robust RI (PRI), second order RI and 2D RI algorithms is compared to those of the standard LMS, normalized LMS
(NLMS), variable step size LMS (VSSLMS), discrete cosine transform LMS (DCTLMS),
transform domain LMS with variable step-size (TDVSS), RLS, stabilized fast transversal RLS (SFTRLS), robust RLS (RRLS) and proposed robust RLS algorithms in additive white Gaussian noise (AWGN), correlated Gaussian noise and white and correlated impulsive noise, in noise cancellation, system identification, channel equalization, echo cancellation and image deconvolution setting, in stationary and non-stationary environments. Simulations show that the RI algorithm and its variants outperform all the aforementioned algorithms as will be shown in detail later.
Keywords: Adaptive Filters, LMS Algorithm, RLS Algorithm, RI Algorithm, Correlated
Noise, Impulsive Noise.
…………………………………………………………………………………………………………………………………………………………………………………………………………………… ÖZ: Uuyarlanır süzgeçler, sistem parametrelerinin değişimine uyum sağlayabilmek amacıyla kullanılmaktadır. sonlu dürü yanıtlı (sdy) uyarlanır süzgeçlerde, süzgeç¸ ağırlıkları özyineli olarak güncellenmekte ve istenilen tepki ile süzgecin çıktısındaki ortalama karesel hata (okh) en aza indirgenmeye çalışılmaktadır. uyarlanır süzgeç ¸lerin uygulumalarında bir çok farklı sorun bulunmaktadır: ilintili ortamlarda sabit katsayılı süzgeçler düşük başarım göstermekte, özilinti matrisinin tersinin alınmasını gerektiren algoritmalarda yakınsama ve yüksek işlem karmaşıklığı gözlemlenmekte ve zamana göre değişen ortamlarda da izleme konusunda sorunlarla kars¸ılas¸ılmaktadır. bu tezde özyineli ters (öt), özgün bir sdy uyarlanır süzgeç¸ önerilmektedir. algoritma, değişken bir adım uzunluğu kullanmakta ve özilinti matrisinin anlık değerini katsayıların güncellenmesi sırasında hesaplayarak daha yüksek başarım sağlamaktadır. RLS algoritmasının aksine özilinti matrisinin tersinin hesaplanmasına ihtiyaç duyulmadığı için yakınsama daha başarılı bir şekilde dağlanmaktadır. öt algoritmasının ortalama öğrenme eğrisi türetilerek rls ve lms algoritmalarınınkilerle kıyaslanmıştır. önerilen algoritma için hızlı bir hesaplama yöntemi de önerilmiştir. dürtün gürültüyü gidermek amacıyla öt algoritmasının gürbüz sürümü de önerilmisştir. unutma katsayısının öt başarımına etkisi araştırılmıştır. ayrıca imge işleme uygulamalarında kullanılmak üzere iki boyutlu öt algoritması kullanılmıştır. Son olarak da öt algoritmasının ikinci dereceden kestirim yapan sürümü türetilmiş ve başarımı gösterilmiştir. Başarım karşlaştırılmalarında farklı özelliklerinden dolayı lms, nlms, değişken adımlı lms, dct lms, tdvss, rls, sftrls ve rrls algoritmaları kullanılmıştır. karşlaştırmalar, gauss veya dürtün, ilintili veya beyaz gürültü ortamlarında benzetimlerle gerçekleştirilmiştir. ayrıca, zamanda değişen gürültü ortamlarda, sistem tanımlaması ve yankı giderme uygulamalarında önerilen öt algoritmasının daha yüksek okh hata başarımına ve daha düşük işlem karmaşıklığına sahip olduğu gösterilmiştir.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Adaptive filters - Mathematical Models
Adaptive Filters - LMS Algorithm - RLS Algorithm - RI Algorithm - Correlated Noise - Impulse Noise
Recursive Inverse Adaptive Filtering Techniques And Applications
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/2742013-09-28T18:01:01Zhdl_11129_3
EMU I-REP
author
Bakhshi, Ramin
2013-01-04T13:54:11Z
2013-01-04T13:54:11Z
2011
Bakhshi, Ramin. (2011). 3D Modelling of Buildings and Environments using Laser Scanning and Surface Reconstruction. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/274
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2011. Supervisor: Prof. Dr. N. Süha Bayındır.
ABSTRACT: 3D models of environments and buildings are widely used in Geographical Information Systems (GIS), building information models, constructional management, environmental planning, city guides, path finding and Robotic applications, where the accuracy of data collection and resolution of the 3D model have been the main concern. 3D models of buildings and other objects can be constructed by following three main steps, namely, data acquisition, alignment and surface reconstruction. This project aims at introducing the process of forming a 3-D model from 3-D scan data and describing the data acquisition, alignment and surface reconstruction sequences in detail. Hardware and software design and implementation has been made for each stage of the 3D modelling process and a full grasp of the system is achieved. However, due to the complexity of the system, and also due to time limitation, it was not possible to achieve sufficient performance from the designed system. Instead, a commercial 3D laser scanner was used for the sake of completing the requirements of the 3D Modelling process with a reasonable performance. Current data acquisition systems have been reviewed and compared to discuss their advantages and drawbacks, as a result of which, 3D laser scanner has been chosen to be the most accurate and fast data acquisition system appropriate for scanning indoor and outdoor environments. Due to some limitations of the available 3D laser scanners, a commercial 1D-laser scanner has been converted into a 3D laser scanner, by designing and constructing a pan-tilt mechanism for the 3 axis control of the 1D laser scanner. The new 3D laser scanner is a simple and light in weight, which is easily adopted to a remote operating and monitoring Vehicle (ROMV) which has been designed in this project to add an indoor and outdoor mobility feature to the device. Although the new 3D Laser scanner operates properly, the accuracy and resolution of the scan results are not as expected yet. In order to complete the 3D modelling process with a reasonable accuracy and resolution, data acquisition is achieved by using the 3D laser scanner provided form the Stevens Institute of technology (CAD eye Scanner). This system is not only able to scan indoor and outdoor environments with acceptable resolution, but also it is able to collect RGB data corresponding to each scanned point in the scanned environment.
For the Alignment or Registration of the acquired coordinate data obtained by the 3D Laser scanner, this research has used the semi- automatic method produced by an academic software tool called Mesh-lab. Point cloud model of the Techno park building was obtained by using professional software called Pointools. Surface reconstruction methods are investigated to obtain models with seamless and smooth surfaces from the point cloud model. It is realized that the existing methods fail to produce realistic surfaces under noisy data and a new method based on implicit surface reconstruction using isotropic basis functions has been developed to represent the sharp features more close to their real appearance. Some initial simple results of this method are presented in the thesis. A further work is needed to apply this method to reconstruct the surfaces of a complete 3D building model.
Keywords: 3D Laser scanner, surface reconstruction, registration, radial basis functions, generalization..........
ÖZ: Çevrenin ve binaların 3B modelleri, Coğrafi Bilgi Sistemleri (CBS), bina bilişim modelleri, yapı yönetimi, çevre planlaması, şehir rehberleri, yol bulma ve Robotik uygulamalarında yaygın olarak kullanılmaktadır. Bu uygulamalarda, veri toplamadaki doğruluk ve 3B modellerin çözünürlüğü en önemli ilgi odağıdır. Binaların ve diğer nesnelerin 3B modelleri, aşağıdaki üç ana aşamada oluşturulur: veri toplama, yerleştirme ve yüzeylerin düzeltilmesi. Bu proje, taranmış 3B verilerinden, 3B modelleri oluşturma sürecini anlatmayı ve veri toplama, yerleştirme ve yüzey düzeltme süreçlerini detaylı olarak tanımlamayı hedefler. 3B modelleme işleminin her aşaması ile ilgili çeşitli donanım ve yazılım tasarımları ve uygulamaları yapılmış ve sistem tümüyle kavranmıştır. Ancak, sistemin çok karmaşık bir yapıda olması ve zaman sınırlaması nedeniyle, tasarlanan sistemden yeterli performans elde edilememiştir. Bunun yanı sıra, 3B modellemenin tüm aşamalarını, makul bir performans ile gerçekleştirebilmek için, ticari bir 3B Lazer tarayıcı kullanılmıştır. Mevcut veri toplama sistemleri taranmış, avantaj lar ile dezavantajları karşılaştırılmış ve sonuç olarak, 3B Lazer tarayıcı, iç ve dış mekanları taramak için kullanılabilecek en doğru ve hızlı tarayıcı olarak seçilmiştir. Mevcut 3B Lazer tarayıcıların sınırlamaları göz önüne alınarak, ticari bir 1B lazer tarayıcının 3 eksenli kontrolünü yapan bir pan-tilt mekanizması tasarlanıp üretilmiş ve sonuçta, 1B tarayıcı, 3B tarayıcıya dönüştürülmüştür. Yeni 3B lazer tarayıcı, bu projede tasarlanan ve
üretilen, uzaktan kumandalı ve göstergeli araç’a (UKGA) kolaylıkla adapte edilebilen basit ve hafif bir yapıdadır. Yeni 3B Lazer tarayıcı, düzgün çalışmakla birlikte, tarama sonuçlarının doğruluğu ve çözünürlüğü henüz beklendiği gibi değildir. 3B modelleme sürecini, makul bir doğrulukla tamamlayabilmek için, Stevens Teknoloji Enstitüsünden sağlanan 3B Lazer tarayıcı (Cade Eye Tarayıcı) kullanılmıştır. Bu sistem yalnızca iç ve dış mekanları, kabul edilebilir bir doğrulukla taramakla kalmayıp, aynı zamanda, taranan bölgedeki her noktanın RGB verilerini de toplayabilmektedir. 3B lazer tarayıcı tarafından toplanan verilerin yerleştirilmesi veya kaydedilmesi işleminde, Meshlab isimli bir akademik yazılım aracı tarafından üretilen, yarı-otomatik bir yöntem kullanılmıştır. Teknopark binasının nokta bulutu modeli, Pointools adlı bir profesyonel yazılım kullanılarak oluşturulmuştur. Nokta bulutu modelinden, kesintisiz ve düzgün yüzeyler elde edebilmek için, yüzey düzeltme yöntemleri araştırılmıştır. Mevcut yöntemlerin, gürültülü veriler altında, gerçekçi yüzeyler üretmekte başarısız olduğu anlaşılmış ve, keskin özelliklerin gerçek görüntülerine daha yakın temsil edilebilmesi için, izotropik tabanlı fonksiyonlar kullanan örtülü yüzey düzeltme yöntemini esas alan yeni bir yöntem geliştirilmiştir. Bu yöntemin bazı başlangıç düzeyindeki basit uygulamaları bu tezde sunulmuştur, ancak, bu yöntemin bir binanın tamamının 3B modeline uygulanabilmesi için daha ileri çalışmalara ihtiyaç vardır.
Anahtar Kelimeler: 3D Lazer tarayıcı, yüzey geriçatımı yerleştirilme, radial taban fonksiyonları, genelleme.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Three-Dimensional Display Systems
3D Laser Scanner - Surface Reconstruction - Registration - Rasial Basis Functions - Generalization
3D Modelling of Buildings and Environments using Laser Scanning and Surface Reconstruction
Thesis
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oai:i-rep.emu.edu.tr:11129/2872013-09-28T18:16:25Zhdl_11129_3
EMU I-REP
author
Sule, Halidu
2013-01-08T11:07:25Z
2013-01-08T11:07:25Z
2012
Sule, Halidu. (2012). Adult Content Filtering Using Text and Image Analysis. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/287
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT: The working principle of the Internet is such that anyone who sets up a server computer and connects it to the local area network in their neighborhood becomes equipped to shear with the world any type of information they deem appropriate. Generally, some of this information dispatched is not appropriate for viewing of our children and some steps should be taken to help the society so that classification and controlled access become possible. Throughout this thesis, we designed and implemented a text and image based web-page filtering system that makes use of web page parsing, HTML tags removal and string in string search procedures along with various other criteria for processing images downloaded from a web site using a custom written JAVA program. For the text, there are some words and phrases that are common to pornographic sites and are rarely seen in regular sites. To find out such words and phrases, a survey was done on a number of sites. With the words and phrases determined, our expectation is that any site which may contain pornographic oriented text will have in it some of these words and phrases. Hence, once the tested web page was parsed and the pure text string was obtained from the downloaded HTML code the string would be searched for the type of words and phrases previously determined and final decision would be made based on the frequency of words detected. From literature survey, everyone seems to agree that pornographic images have too much skin exposure which is why detecting skin is generally the starting point. To find out the amount of skin in an image, improved YCbCr color segmentation was implemented. The improved YCbCr segmentation would satisfactorily segment out the skin from the other regions but some skin like objects would still be falsely detected. Therefore, texture property was used to differentiate bearing in mind that skin is generally smooth and most others textures aren’t (many are more coarse). In order to classify a web site from which images have been extracted through the help of a JAVA program, criteria such as face detection, lacunarity, edge sum, uniformity, entropy and percentage of skin region have been employed and when three or more of the criteria were met this was taken as an indication for containing adult nature material. Final decision was made by computing percentages for the results obtained for both the text and image analysis and comparing the average of the two to some previously selected threshold ranges. For the five randomly selected adult content containing web sites that were used for test purposes the text analysis always gave 95-100% accuracy and the image analysis resulted in 56.83, 54.83, 52.63, 57.14, 66.67 % accuracy respectively for sites 1-5 as detailed in chapter 5. In chapter five it was also shown how the two results (text and image analysis) can be combined to get an average percentage. For the five different web sites considered the lowest average percentage obtained was 73.82%.
Keywords: HTML parsing, skin color segmentation, texture analysis, lacunarity.
………………………………………………………………………………………………………………………………………………………………………………
ÖZ: İnternetin çalışma prensipleri, bir bilgisayarı server olarak kullanıp komşuluğundaki yerel ağ bağlantısına bağlayan herkesin uygun gördüğü her türlü bilgiyi dünya ile paylaşmak için gerekli donanıma sahip olacağı bir ortam oluşturmaktadır. Genel olarak çocuklarımızın paylaşılan bu bilgilerin bir kısmına erişimleri uygun olmayıp sınıflandırma ve kontrollü erişimin sağlanması amacıyla topluma yardımcı olmak adına bazı çalışmaların yapılması gerekmektedir. Bu tez çalışmasında, geliştirilen bir JAVA programı sayesinde bir web sitesinden indirilen görüntülerin işlenmesi için çeşitli diğer kriterlerin yanında web sitesi ayrıştırılması, HTML etiketlerinin kaldırılması ve digi içinde dizgi araştırma prosedürlerini uygulayan metin ve görüntü bazlı bir web site filtreleme sistemi geliştirilmiştir. Metin ile ilgili olarak genellikle normal sitelerde nadiren görülen ve pornografik siteler arasında ortak olan bazı kelime ve terimler bulunmaktadır. Bu kelime ve terimlerin belirlenmesi ve saptanması amacıyla birkaç site üzerinde bir anket çalışması yapılmıştır. Belirlenen kelime ve terimlerden yola çıkılarak, beklentimiz pornografik odaklı metinleri içeren sitelerde bu kelime veya terimlerin bazılarının bulunacağı yönündedir. Dolaysıyla test edilen web sitesinin ayrıştırılıp indirilen HTML kodlarından saf metin dizelerinin elde edilmesinden sonra bu dizeler daha önceden belirlenen kelime ve terimler açısından araştırılacak olup nihai kararlar belirlenen kelimelerin kullanım sıklıkları dikkate alınarak verilecektir. Literatür çalışmasından, herkesin pornografik içerikli sitelerde yüksek deri gösterim oranlarının bulunduğu yönünde hem fikir olduğu belirlenmiş olup bu gerçek ise cilt belirlemesinin bir başlangıç noktası olarak kabul edilmesinin nedenini oluşturmaktadır. Bir görüntüdeki cilt oranının belirlenmesi için geliştirilmiş YCbCr renk ayrıştırmama algoritması uygulanmıştır. Bu yöntem cildin diğer kısımlardan ayırt edilmesinde iyi sonuçlar doğurmuş olup ancak cilt ile benzer özelliklere sahip olan bazı diğer kısımlar da yanlıkşlıkla ayırt edilmiştir. Dolaysıyla cildin genellikle diğer dokuların bir çoğu ile kıyas ile daha yumuşak olduğu (birçoğu daha kabadır) izleniminin göz önünde bulundurulması amacıyla doku özelliklerinden yararlanılmıştır. Bir JAVA programından yararlanılarak görüntülerin çıkarıldığı bir web sitesinin sınıflandırılması amacıyla yüz tanıma, lakunarite, kenar toplamları, tekdüzelik, cilt alanı entropi ve yüzdesi gibi bazı kriterler dikkate alınmış olup bu kriterlerin en az üçünün sağlandığı durumlarda yetişkenlere özel içeriklerin bulunduğu yönünde bir işaret olarak kabul edilmiştir. Nihai kararlar hem metin hem de görüntü analizlerinden elde edilen sonuçların yüzdelerinin hesaplanması ve bu iki faktörün ortalamasının daha önceden belirlenen bir eşik değer ile karşılaştırılması sonucunda verilmiştir. Yetişkinlere özel içeriklere sahip olup test amacıyla kullanılan ve gelişigüzel bir şekilde seçilen beş web sitesi için metin analizleri her zaman 95-100% oranında doğruluk göstermiş olup görüntü analizleri ise 1-5 olarak adlandırılan ve 5.bölümde detaylı bir şekilde açıklanan web siteleri için sırasıyla 56.83, 54.83, 52.63, 57.14 ve 66.67% olarak sonuçlanmıştır. Beşinci bölümde ayrıca ortalama bir yüzde oranının elde edilmesi için zikredilen iki sonucun (metin ve görüntü analizleri) nasıl birleştirilebileceği belirtilmiştir. Dikkate alınan beş farklı web sitesi için elde edilen en düşük ortalama yüzde oranı 73.82% olarak bulunmuştur. Anahtar Kelimeler: HTML ayrıştırması, deri rengi ayrıştırması, doku analizi, lakunarite.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Image Processing
HTML Parsing - Skin Color Segmentation - Texture Analysis - Lacunarity
Adult Content Filtering Using Text and Image Analysis
Thesis
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oai:i-rep.emu.edu.tr:11129/3262013-01-11T00:00:54Zhdl_11129_3
EMU I-REP
author
Sabah, Nasser M. A.
2013-01-10T12:07:17Z
2013-01-10T12:07:17Z
2012
Sabah, Nasser M.A. (2012). Enhancement of Mobile Ad-hoc Network Models by Using Realistic Mobility and Access Control Mechanisms. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/326
Doctor of Philosophy in Electrical and Electronic Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor:Assoc. Prof. Dr Aykut Hocanın.
ABSTRACT: A mobile ad-hoc network (MANET) is a collection of wireless mobile nodes forming a temporary network without the need for base stations or any other preexisting network
infrastructure. Ad-hoc networking received a great interest due to its low cost, high flexibility, fast network establishment, self-reconfiguration, high speed for data services, rapid deployment and support for mobility. However, in a wireless network without a fixed infrastructure and with nodes’ mobility enabled, the topology keeps on changing. This causes frequent path changes and leads to an increase in network congestion and transmission delay. Random waypoint (RWP) mobility model is widely used in ad-hoc network simulations. The model suffers from speed decay as simulation progresses, and may not reach the steady state in term of instantaneous average node speed. This usually leads to inaccurate results in protocol validation of MANETs modeling. The convergence of the average speed to its steady state value is delayed. Also, the probability distributions of speed vary over the simulation time, such that the node speed distribution at the initial state is different from the corresponding distribution at the end of the simulation. Gamma random waypoint (GRWP) mobility model has been proposed to overcome
these problems. The nodes’ speeds of GRWP are sampled from Gamma distribution. The analysis and simulation results indicate that the proposed GRWP mobility model outperforms the existing RWP mobility models. In modeling wireless ad-hoc networks, the assumption of infinite population is usually made. However, such models lead to deficiencies in the model, since they do not hold in real applications. Therefore, we model the wireless ad-hoc network as closedform
queueing network. In particular, the carrier sense multiple access with collision avoidance (CSMA/CA) based RTS/CTS handshake mechanism is modeled under finite population assumption. We take into account packet arrival time, network size, packet size, buffer size and backoff scheme. This is to ensure a realistic queueing model which describes the MAC protocol and nodes’ behavior in the network environment more precisely. The collected results indicate that the finite population model gives an accurate and more realistic behavior of the RTS/CTS mechanism.
Keywords: Ad-hoc Networks, IEEE 802.11, MANETs, performance of MAC protocol, CSMA/CA, mobility models, RWP, Gamma distribution, finite population, blocking
probability.
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ÖZ: Tasarsız gezgin ağlar yer istasyonu veya daha önceden kurulmuş ağ yapısı gerektirmeyen ve gezgin düğümler tarafından geçici olarak oluşturulan ağlardır. Tasarsız ağlar, düşük maliyet, yüksek esneklik, hızlı kurulum, kendi kendine düzenleşim sağlama, yüksek hızda veri iletişim hizmeti sunma ve gezgin iletişime olanak tanıma özelliklerinden dolayı araştırmacılar tarafından ilgi toplamıştır. Herhangi bir telsiz ağda sabit bir altyapı bulunmadığından ve düğümlerin gezgin
olmasından dolayı, ağ topolojisi sürekli değişmekte ve bunun sonucu olarak ağ tıkanıklığı ve iletim gecikmesi ortaya çıkmaktadır. Rasgele yolgösterme (RWP) devingenlik modeli tasarsız ağların benzetiminde geniş olarak kullanılanmaktadır. Benzetim ilerledikçe, düğümlerin hızlarının azalması sorunu modelde gözlemlenmekte ve anlık hızların dağılımı kararlı duruma ulaşamamaktadır. Bu, doğru olmayan sonuçlara yol açmakta ve protocol doğrulanmasını güçleştirmektedir. Ayrıca, ortalama hız, kararlı hız değerine geç ulaşmakta ve düğüm hızların olasılık dağılımı benzetim süresince değişmektedir. Gamma yolgösterme devingenlik (GRWP) modeli bu sorunların giderilmesi için önerilmiştir. Benzetim sonuçları ve analitik türetimler GRWP modelinin mevcut modellere göre daha iyi başarıma sahip olduğunu göstermektedir. Tasarsız gezgin ağların modellenmesinde genellikle sonsuz nüfus varsayımı kullanılmakta ama bu gerçek uygulamalarda eksikliklere yol açmaktadır. Bu nedenle, IEEE 802.11 RTS/CTS erişim protokolunda sonlu nüfus varsayımı kuyruk ağ modeli olarak kullanılmıştır. Paketlerin varış zamanı, ağın büyüklüğü ve yastık belleği göz önüne alınmış ve MAC protokolundaki düğümlerin davranışları gerçekçi ve daha doğru olarak modellenmiştir.
Anahtar Kelimeler: Tasarsız ağlar, IEEE 802.11, MAC protokolu, devinim modeli, RWP, sonlu nüfus varsayımı.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Mobile Communication - Wireless Communication
Ad Hoc Networks (Computer Networks)
Ad-Hoc Networks - IEEE 802.11 - MANETs - Performance of MAC Protocol
CSMA/CA - Mobility Models - RWP - Gamma Distribution
Finite Population - Blocking Probability
Enhancement of Mobile Ad-hoc Network Models by Using Realistic Mobility and Access Control Mechanisms
Thesis
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oai:i-rep.emu.edu.tr:11129/3342013-01-12T00:00:30Zhdl_11129_3
EMU I-REP
author
Ghasemzadeh, Aman
2013-01-11T09:27:35Z
2013-01-11T09:27:35Z
2012
Ghasemzadeh, Aman. (2012). Comparison of Feature Based Fingerspelling Recognition Algorithms. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/334
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT : Sign language is a manual language which uses hand gestures instead of sounds. These gestures are produced by combining hand-shapes, orientation and movement of hands. Sign language is not international and it has been defined with the intension of communicating with deaf people. In sign language, two major types of communication are considered. The first one is based on word sign vocabulary, where common words are defined by body language. The second, which is also known as fingerspelling is a letter based vocabulary which uses the letters in a particular alphabet and involves the use of hands only. The manual alphabets created for fingerspelling are called finger alphabets. There are two main families of manual alphabets. The one-hand and the two-hand families. American Sign Language (ASL) is used for deaf people in America and south of Canada and it belongs to the one-hand family. The work carried out in this thesis includes the analysis of recognition performance of ASL fingerspelling under four main methods. Mainly the prominent feature extraction, Principal Component Analysis (PCA), Discrete Cosine Transform (DCT) based code assignment and Singular Value Decomposition (SVD) are coupled with circularity. In this work while developing the ASL fingerspelling recognition for the 26 letters of the English alphabet a custom database has been used. This database was generated by using four different signers and each person has signed a total of six times for each letter. Hence 156 images for each signer and a total of 624 images for the entire alphabet were acquired. Each image had 640 × 480 pixel resolution. Throughout the simulations the custom hand dataset and three randomly shuffled versions of this original set were obtained. Each one of the four methods mentioned above had been applied to the individual sets and the results were compared referring to accuracy in determining the signed characters. The simulation results show that when DCT and SVD are applied locally (to sub-blocks instead of the global image) they both give very good performances. In the case of 4:2 training vs. testing the overall recognition rate for the SVD applied locally is 100% and for the DCT applied locally this value was 97.11%. When the SVD is applied globally under the same conditions the overall recognition rate was 92.3%. In fact, SVD using all the singular values has a better performance than the DCT using only the most important coefficients. If we are not concerned about complexity SVD would give the highest overall recognition rate whereas if reduction in complexity is a must DCT is the best contender. The third best result was obtained using the prominent features based method. In contrast, the poorest recognition rate was related to the PCA. The performance of PCA is degraded since hand patterns are not correlated and the mean hand image is quite dispersed. As the training to testing ratio is decreased the overall performance for all methods would gradually also go down.
Keywords: American Sign Language, fingerspelling, principal component analysis, discrete cosine transform and singular value decomposition.
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ÖZ: İşaret dili, ses yerine el hareketlerini kullanan manuel bir dil olarak tanımlanmaktadır. Bu figürler, değişik el-şekilleri, oryantasyonu ve hareketlerinden oluşmaktadır. İşaret dili uluslararası bir dil olmayıp duyma yeteneği bulunmayan insanlar ile iletişimin güçlendirilmesi amacıyla tanımlanmıştır. İşaret dilinde iki ana iletişim şekli tanımlanmaktadır. Bunların birincisi, ortak kelimeler için vücut dilinin kullanıldığı kelime işaretlerine dayanmaktadır. Aynı zamanda Parmak Yazımı olarak da adlandırılan ikinci iletişim yöntemi ise karakterleri özel bir alfabede kullanan ve yalnızca ellerin kullanıldığı yazıma dayalı bir anlatım yöntemidir. Parmak yazımı için oluşturulan manuel alfabe, parmak alfabesi olarak adlandırılmaktadır. Amerikan İşaret Dili (AİD) [ASL] duyma yeteneği bulunmayan insanlar için Amerika ve Güney Kanada’da kullanılmakta olup bir-el ailesine aittir. Bu tez çalışmasında AİD Parmak Yazımı tanıma performansı 4 ana yöntem altında analiz edilmiştir. Bu yöntemler esas olarak Önemli Özellik Çıkarma, Ana Bileşen Analizi (ABA) [PCA], Ayrık Kosinüs Dönüşümüne (AKD) [DCT] dayalı kod ataması ve dairesellikle bir araya getirilen Tekil Değer Ayrışması (TDA) [SVD] olarak sayılabilmektedir. Bu tez çalışmasında 26 statik İngiliz alfabesi karakteri için AİD tanıma sisteminin geliştirilmesi sırasında özel bir veritabanı kullanılmıştır. Bu veritabanı 4 değişik denek kullanılarak hazırlanmış olup her denek her bir karakter için toplam 6 kez işaret kullanmıştır. Dolaysıyla her bir denek için toplam 156 görüntü ve tüm alfabe için toplam 624 görüntü elde edilmiştir. Her görüntünün çözünürlüğü 640×480 pikseldir. Simülasyonlar boyunca özel el veritabanları ve bu orijinal setlerin gelişigüzel bir şekilde karıştırılan 3 versiyonu elde edilmiştir. Yukarıda açıklanan 4 yöntemin her biri bir kez olmak üzere her bir sete uygulanmış olup çıkan sonuçlar hassasiyet faktörü göz önünde bulundurularak karşılaştırılmıştır. Çıkan sonuçlar AKD ve TDA’nın yerel olarak kullanıldığında (global görüntü yerine alt-bloklara) bu yöntemlerin her ikisinin de çok iyi performans sergilediğini göstermektedir. 4:2’lik öğrenme – test durumunda genel tanıma oranı, yerel olarak uygulanan TDA için 100% olup bu oran yerel olarak uygulanan AKD için 97.11%’dir. TDA aynı koşullar altında global olarak uygulandığında genel tanıma oranı 92.3% olmuştur. Gerçek anlamda tüm tekil değerleri kullanan TDA yalnızca en önemli katsayıları kullanan AKD’den daha iyi bir performansa sahiptir. Karmaşıklık oranının azaltılmasının bir zorunluluk olduğu durumlarda AKD’nın en iyi performansı sunduğu gerçeğinin yanısıra, karmaşıkılık oranının bizim açımızdan endişe yaratmadığı durumlarda TDA en yüksek genel tanıma oranını sunacaktır. En iyi üçüncü sonuç Önemli Özellik bazlı yöntem kullanıldığında elde edilmiştir. Buna karşın en zayıf tanıma oranı ABA’ya ait olmuştur. ABA’nın performansı el hareketleri arasında bir ilişki bulunmadığından ve ortalama el görüntüsünün oldukça dağınık olduğundan dolayı düşmüştür. Öğrenme – test oranının düşmesi ile birlikte tüm yöntemler için genel performans değerleri de giderek azalacaktır.
Anahtar Kelimeler: Amerikan İşaret Dili, Parmak Yazımı, Ana Bileşen Analizi, Ayrık Kosinüs Dönüştürme ve Tekil Değer Ayrışması.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Recognition
American Sign Language - Fingerspelling - Principal Component Analysis - Discrete Cosine Transform and Singular Value Decomposition
Comparison of Feature Based Fingerspelling Recognition Algorithms
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/3422013-01-16T00:00:17Zhdl_11129_3
EMU I-REP
author
Hilal, Hasan Saed Abu
2013-01-15T11:20:51Z
2013-01-15T11:20:51Z
2012
Hilal, Hasan Saed Abu. (2012). Performance of MIMO CDMA in Impulsive Channels. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/342
Doctor of Philosophy in Electrical and Electronic Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Assoc. Prof. Dr. Aykut Hocanın.
ABSTRACT: In this thesis, multiple-input and multiple-output (MIMO) communication systems, in code division multiple access (CDMA) settings, and vertical-bell layered space time
(VBLAST) algorithms are investigated. The performance of linear CDMA detectors, operating in an environment with interference due to non-Gaussian noise and time mismatch is considered. The robust successive interference cancellation (RSIC) and robust space time decorrelating detectors (RSTDD) are employed to detect the signals received by multi receiving antennas having time mismatches. The performance of the detectors in practical situations such as incomplete channel state information, corre- lated antennas, and impulsive noise is investigated. The results show that RSIC and RDD have a good performance in adverse conditions. The performance of the DD in MIMO CDMA system under two different impulsive noise models is examined. A robust detection technique is proposed to overcome the impulsive effect on the system. Maximal ratio combining (MRC) and post detection combining (PDC) are used to achieve diversity reception. We show that the proposed RDD outperforms the linear decorrelating detector (DD) consistently for the ideal and power imbalanced cases. Furthermore, we analyzed and derived the probability of bit error (Pb) expression of a successive interference cancellation (SIC) system for MRC and PDC schemes. The performance bounds were also derived and depicted for identically independent distributed variances at the receiving ends. It is found that the MRCSIC has higher performance for equal variances at the receiving antennas. On the other hand, the PDCSIC performs better when the variances are i.i.d.
Keywords: CDMA, MIMO CDMA, diversity, impulsive noise, robust detection, VBLAST, SIC, channel estimation, time mismatch, multiuser detection.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Wireless Communication Systems
Code Division Multiple Access (CDMA) - Multiple Input and Multiple Output (MIMO) CDMA - Diversity - Impulsive Noise
Robust Detection - Vertical - Bell Layered Space Time (VBLAST) - Successive Interference Cancellation (SIC)
Channel Estimation - Time Mismatch - Multiuser Detection
Performance of MIMO CDMA in Impulsive Channels
Thesis
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oai:i-rep.emu.edu.tr:11129/3562013-01-19T00:00:20Zhdl_11129_3
EMU I-REP
author
Abrishambaf, Reza
2013-01-18T06:26:39Z
2013-01-18T06:26:39Z
2012
Abrishambaf, Reza. (2012). A Novel Methodology for Development of Distributed Industrial Wireless Sensor and Actuator Network in Reconfigurable Mechatronic Devices. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/356
Doctor of Philosophy in Electrical and Electronic Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Majid Hashemipour.
ABSTRACT: Recently the globalization of manufacturing industry systems has led to increase the competition in respond to today’s demanding market especially in medium-size companies. The global competition requires the manufacturing systems to be flexible and reconfigurable specifically in the shop floor level where mechatronic devices reside. In this thesis, a novel methodology for the development and structural modeling of industrial wireless sensors and actuators is presented in order to provide flexibility and reconfigurability to the mechatronic devices. The proposed methodology is based on the implementation of the IEC 61499 standard for the distributed control of mechatronic systems. The methodology also addresses the existing problems of this standard for capturing the system requirements in the development process. For this reason, the Unified Modeling Language (UML) is used in order to overcome this problem. Petri net as a mathematical modeling language is employed in order to demonstrate the performance of the proposed methodology. A prototype software tool is designed to translate the developed UML diagrams to IEC 61499 standard models as XML files.
Keywords: Distributed Control Systems, IEC 61499 Function Blocks, Industrial Wireless Sensor and Actuator Networksiv.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Son zamanlarda üretim endüstri sistemlerinde yaşanan globalleşme süreci, özellikle orta ölçekli şirketlerde olmak üzere günümüz talep piyasasının ihtiyaçlarının karşılanması doğrultusunda rekabet ortamının gelişmesi ve artmasına yol açmıştır. Köresel rekabet ortamı, özellikle mekatronik ürünlerinin bulunduğu fabrika ortamlarında, üretim sistemlerinin esnek ve yeniden yapılandırılabilir olmasını gerektirmektedir. Bu tez çalışmasında, mekatronik ürünlerinin esnekliği ve yeniden yapılandırılabilirliğinin sağlanması amacıyla endüstriyel kablosuz sensörler ve çalıştırıcıların geliştirilmesi ve yapısal olarak modellenmeleri için yeni bir yöntem geliştirilmiştir. Bahsı geçen yöntem mekatronik sistemlerinin dağınık kontrolü için kullanılmakta olan IEC 61499 standardının uygulanmasına dayanmaktadır. Bu yöntem ayrıca zikredilen standardın, geliştirilme sürecindeki sistem gereksinimlerinin belirlenmesi konusunda yaşamakta olduğu mevcut problemlerine de hitap etmektedir. Bu neden ile, bu problemin ortadan kaldırılması amacıyla Birleştirilmiş Modelleme Dili’nden (BMD) (Unifield Modeling Language- UML) yararlanılmıştır. Önerilen yöntemin performansının gösterilmesi amacıyla matematiksel bir modelleme dili olarak Petri net’den yararlanılmıştır. Geliştirilen BMD diyagramlarının XML dosyaları olarak IEC 61499 standart modellerine çevirilmesi amacıyla bir prototip yazılım aracı tasarlanmıştır.
Anahtar Kelimeler: Dağıtılmış Kontrol Sistemleri, IEC 61499 Standart, Endüstriyel Kablosuz Sensör ve Aktüatör Ağı.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Mechatronics
Distributed Control Systems - IEC 61499 Function Blocks - Industrial Wireless Sensor and Actuator Networks
A Novel Methodology for Development of Distributed Industrial Wireless Sensor and Actuator Network in Reconfigurable Mechatronic Devices
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/5922013-02-27T00:00:19Zhdl_11129_3
EMU I-REP
author
Khalaf, Murad Ghazy
2013-02-26T07:14:55Z
2013-02-26T07:14:55Z
2010
Khalaf, Murad Ghazy. (2010). Connectivity Analysis of Large-Scale Wireless Ad Hoc Networks with Heterogeneous Nodes. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/592
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2010. Supervisor: Assoc. Prof. Dr. Doğu Arifler.
ABSTRACT: Research in large-scale ad hoc and wireless sensor networks (WSNs) has developed rapidly due to the large number of applications in environmental monitoring, structure health monitoring, contaminant detection, industrial process control, and military target tracking. The nodes in WSNs communicate in a multi-hop fashion to deliver the sensed data to a unit called the sink. Communication requires network connectivity that might not be possible all of the time due to sensor deployment strategy or node failure. Hence, connectivity can be considered as an essential requirement in WSNs, because without having a connected network, not all of the nodes will be reachable to transmit information. This thesis has studied the problem of evaluating the connectivity in WSNs for a given number and given transmission ranges of nodes. Comparisons are carried out to evaluate the connectivity by using two different deployment strategies: deployment of homogeneous sensor nodes (in terms of transmission range) and heterogeneous sensor nodes. In particular, the connectivity of a WSN network with two types of nodes is analyzed. A distinct feature of the study presented is the modeling of the network as a directed graph. Phase transition behavior of connectivity that is observed in homogeneous deployments is also apparent in networks with heterogeneous deployments where the networks are modeled as directed graphs. It is established through a large set of simulations that networks with homogeneous node deployments provide higher connectivity for a given power budget. These results are consistent with previous related findings that use undirected graphs for modeling networks.
Keywords: Ad Hoc Networks, Wireless Sensor Networks, Network Connectivity, Phase Transitions.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Tasarsız ve kablosuz algılayıcı ağlar (WSNs) hakkında araştırma, uygulama alanlarının genişliğinden dolayı hızla gelişmiştir. Bu uygulama alanları arasında çevre gözlemleme, sağlık durumu takibi, atık madde sezimi, endüstriyel süreç denetlemesi ve askeri hedef izleme bulunmaktadır. Algılayıcı ağlardaki düğümler çoklu aktarımlarla algılanan veriyi hedefe iletmektedir. İletişim için bağlantısallık gerekmektedir. Düğümlerin çalışmamasından veya yerleştirilmelerinden dolayı her zaman bağlantısallık sağlamak olanaklı değildir. Bu yüzden bağlantısallık telsiz algılayıcı ağların başarımlarını değerlendirmek için etkili bir ölçüttür. Bu tezde, belirli bir sayıda düğüm ve bunların iletim uzaklığı ile elde edilen bağlantısallık oranları incelenmiştir. İki ana düğüm yerleştirme stratejisi olan tektürel ve çoktürel algılayıcı yerleştirme stratejileri karşılaştırılmıştır. Çoktürel yerleştirilmiş bir ağda iki farklı düğüm çeşidi kullanarak bağlantısallığı araştırılmıştır. Çalışmanın özgün yanlarından biri algılayıcı ağların yönlendirilmiş çizge ile modellenmesidir. Tektürel yerleştirilmiş ağlarda görülen evre geçişleri, çoktürel yerleştirilmiş ağlarda da görülmektedir. Benzetimler (sabit bir güç oranı için), tektürel algılayıcı yerleştirme stratejisinin daha yüksek bağlantısallık sağladığını göstermektedir. Bu da daha önce yönsüz çizge ile yapılan modellemelerle elde edilen sonuçlarla uyuşmaktadır.
Anahtar Kelimeler: Tasarsız ağlar, Telsiz algılayıcı ağlar, Bağlantısallık, Evre geçişleri.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Wireless Communication Systems
Ad Hoc Networks (Computer Networks)
Mobile Communication Systems
Ad Hoc Networks - Wireless Sensor Networks - Network Connectivity - Phase Transitions
Connectivity Analysis of Large-Scale Wireless Ad Hoc Networks with Heterogeneous Nodes
Thesis
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oai:i-rep.emu.edu.tr:11129/6002013-08-12T23:00:35Zhdl_11129_3
EMU I-REP
author
Makhamreh, Hamza A. M.
2013-08-12T07:02:49Z
2013-08-12T07:02:49Z
2013
Makhamreh, Hamza A.M. (2013). Sliding Mode Control Applied To UPS Inverter Using Norm of the State Error. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/600
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: In dynamical system it is impossible to avoid dealing with uncertain conditions such as disturbances; that case is applicable on the UPS Inverter. There are many approaches to control inverters; here we are going to introduce a new approach of sliding mode control applied to UPS inverters.
We reduce the sliding time of the state trajectory, by defining a function with respect to the error norm. This function gives the system a value of the sliding line at each instance, such that the performance is improved. The function is defined as the norm of both voltage error and its derivative multiplied by a factor. The norm value is saturated for small and large value of λ, which represents the slope of the sliding line. Another parameter (β) is also introduced, which is a gain multiplying the result of the saturated function.
When the state is far from the origin, small value of λ is used in the reaching mode, while large value of λ is used when the state reaches the sliding line and start to “slide” on the sliding line. From the definition of the norm error, a function is derived which is used to minimize the reaching time. The results of simulation are compared to Three level hysteresis and rotating sliding mode approaches. The new approach shows a fast response with very small value of the voltage error.
Keywords: uninterruptible power supply, inverters, sliding mode control, rotating sliding line.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Dinamik sistemlerde bozan etkenler gibi belirsiz durumlarla karşılaşmak mümkündür. Bu çevirgeçler için de geçerlidir. Çevirgeçleri kontrol etmek için bir çok yaklaşım vardır. Bu çalışmada Kesintisiz Güç Kaynak (KGK) çevirgeçlerin kontrolu için yeni bir kayan kipli kontrol yöntemi önerilmektedir.
Hata dizgesine bağlı bir işlev tanımlamak suretiyle durum gezingesinin kayma zamanını kısaltmak mümkündür. Bu işlev kayma çizgisine her an yeni bir eğim vererek başarımı artırmaktadır. Bu işlev çıkış voltajı ve türevinin düzgesi olarak tanınlanmaktadır. Düzge değeri kayma çizgisinin eğiminin çok küçük ve çok büyük değerleri için doyuma ulaşır. Bu doyumlu işlevi çarpan bir parametre (β) daha tanımlanmıştır.
Durum vektörü merkezden uzak olduğunda ve erişme kipi sırasında λ için küçük, durum vektörü kayma çizgisine ulaştığında ve bunun üzerinde kaymaya başladığında ise büyük bir değer kullanılır. Düzgenin tanımından hareketle kayma zamanını en aza indigemede kullanılabilecek bir işlev elde edilmiştir. Benzetim sonuçları üç-seviyeli histerisis ve dönen kayma kipli yöntemleri ile karşılaştırılmıştır. Önerilen yöntemin daha hızlı tepki ve daha düşük voltaj hatası verdiği gözlenmiştir.
Anahtar kelimeler: Kesintisiz Güç Kaynakları, Çevirgeçler, Kayan Kipli Kontrol, Dönen Kayma Çizgisi.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Control Devices - Inverters
Uninterruptible Power Supply - Inverts - Sliding Mode Control - Rotating Sliding Line
Sliding Mode Control Applied To UPS Inverter Using Norm of the State Error
Thesis
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oai:i-rep.emu.edu.tr:11129/6202013-08-13T23:00:44Zhdl_11129_3
EMU I-REP
author
Mirshahi, Shiva
2013-08-13T06:56:48Z
2013-08-13T06:56:48Z
2013
Mirshahi, Shiva. (2013). Integration of Radio Frequency Identification and Wireless Sensor Networks. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/620
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: Radio frequency identification (RFID) system is used for detecting and identifying the tagged objects by electromagnetic signals. The main components of RFID are tag (transponder), reader (transceiver) and a host computer. RFID can be implemented in wide applications such as supply chain, car access, animal tracking and smart cards. Wireless sensor network (WSN), which consists of a huge numbers of nodes, can monitor the condition of the environment including pressure, humidity, and temperature. The data are transferred via nodes to a certain location. Some applications of WSNs are in monitoring of earth, supply chain, agriculture, structural health monitoring and localization. Integration of RFID and WSN provides a new feature and improves their functionalities. In RFID systems each tag can only communicate with a reader but integrating RFID tags with nodes, communication of the RFID tags with each other is possible and by integrating readers with nodes, readers can communicate with each other, too. The integration of RFID and WSN in supply chain provides system intelligence. In such a case, tag is embedded in objects and reader is integrated with nodes. Therefore, identification and detection of tagged items is provided by using RFID and monitoring of environment can be obtained by using WSN. To conclude, the present case study is simulated in Petri Net Toolbox in MATLAB environment. It represented the negotiation of smart devices spontaneously in managing variety of instructions in order to enhance system performance such as productivity and efficiency. Moreover, the impact of smart nodes has been integrated for managing different automated guided vehicle (AGVs) to load or unload products to the relevant destinations. In other words, smart nodes satisfied the utilization rates related to different devices. Keywords: Radio frequency identification, wireless sensor network, integration of RFID and WSN, supply chain management, Petri net.
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ÖZ: Radyo Frekans Tanımlama (Radio Frequency Identification, RFID) Sistemi, elektromanyetik sinyaller ile etiketlenen objelerin belirlenmesi ve tanımlanması için kullanılmaktadır. RFID sisteminin ana bileşenleri, etiket (transponder), okuyucu (alıcı) ve bir host bilgisayardan oluşmaktadır. RFID sistemi, tedarik zinciri, araç erişimi, hayvan izleme ve akıllı kartlar gibi birçok uygulama alanında kullanılabilmektedir.
Çok sayıdaki düğümlerden oluşan Kablosuz Sensör Ağları (Wireless Sensor Netwroks, WSN), basınç, nem oranı ve sıcaklık olmak üzere çevre koşullarını izleme uygulamalarında kullanılabilmektedir. Elde edilen bilgiler sensör düğümleri tarafından belli bir noktaya transfer edilmektedir. Kablosuz sensör ağları, dünya izleme sistemleri, tedarik zincirleri, tarım, yapısal sağlık izleme ve lokalizasyon sistemleri gibi alanlarda kullanılmaktadır.
RFID ile kablosuz sensör ağlarının entegrasyonu yeni bir geleceğe kapı açmakta ve bu sistemlerin işlevselliklerini iyileştirmektedir. RFID sistemlerinde her bir etiket yalnızca bir okuyucu ile iletişim kurabilmekte iken, RFID etiketleri ile kablosuz sensör düğümlerinin birleştirilmesi RFID etiketlerinin birbirleri ile iletişim kurmalarına olanak sağlamakta ve okuyucular ile etiketlerin birleşimi sonucunda ise okuyucular da birbirleri ile iletişim kurma özelliğine sahip olacaklardır.
RFID ile kablosuz sensör ağlarının tedarik zincirlerinde birleşmesi ise sistemin akıllı sistem kimliğine sahip olmasını sağlamaktadır. Böyle bir durumda etiketler objelere yerleştirilmekte ve okuyucular ise düğümlere entegre edilmektedir. Dolaysıyla etiketlenen faktörler RFID yardımı ile belirlenip tanımlanacak ve çevresel koşullar kablosuz sensör ağlarından yararlanılarak izlenecektir. Bu çalışmanın simülasyonu MATLAB, Petri Net Toolbox yardımı ile gerçekleştirilmiştir. Çalışmada sistem performansının arttırılması amacıyla akıllı cihazların çok çeşitli talimatların yönetimindeki otomatik iletişimi temsil edilmiştir.
RFID ile kablosuz sensör ağları entegre edilerek iki yapısal sağlık izleme yöntemi tanımlanmıştır. İlk yöntem olan sensör ile pasif-etiket entegrasyonu bina yapılarının izlenmesi için kullanılmıştır. İkinci yöntem olan etiket ile düğüm entegrasyonu ise köprülerde yapısal sağlık izleme uygulaması için kullanılmıştır.
Anahtar Kelimeler : Radyo Frekans Tanımlama, Kablosuz Sensör Ağları, RFID ile Kablosuz Sensör Ağlarının Entegrasyonu, Tedarik Zinciri Yönetimi, Petri Net.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Wireless Sensor Networks
Radio Frequency Identification Systems
Wireless Communication Systems
Radio Frequency Identification - Wireless Sensor Network - Integration of RFID and WSN - Supply Chain Management - Petri Net
Integration of Radio Frequency Identification and Wireless Sensor Networks
Thesis
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URL
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Mirshahi.pdf.txt
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oai:i-rep.emu.edu.tr:11129/6232013-08-13T23:00:40Zhdl_11129_3
EMU I-REP
author
Musa, Aysar
2013-08-13T07:26:07Z
2013-08-13T07:26:07Z
2013
Musa, Aysar. (2013). Power System Stability Analysis Using Recursive Projection Method. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/623
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: Stability represents significant criteria in power system operation. Stability analysis of power systems has been done by using an efficient numerical technique that is the recursive projection method (RPM). RPM analyzes the outputs of the time domain simulation code (TDSC) that is used to simulate the dynamics of a power system, to define a slow/unstable operating mode as a subspace of system’s full space and applying Newton method to improve the convergence of system solution, while fixed-point iteration method is used in the supplement subspace of stable modes. The analysis is performed by detecting those eigenvalues of the state matrix with magnitudes greater than unity, and creating the corresponding orthonormal basis that participates in extending the solution's convergence. This leads to getting a more accurate and stable solution in power systems. When a perturbation occurs to the power system, applying RPM allows the numerical solution to reach its steady-state mode in a short time and without continuous oscillation. Verification of RPM’s achievements has been performed on an example of 6-bus power system. The environment of this work is the Matlab program supported by the power system toolbox (PST).
Keywords: Power system analysis, recursive projection method, numerical integration methods.
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ÖZ: Kararlılık güç sistemlerinin çalışması açısından önemli bir kriterdir. Bu çalışmada güç sistemlerinin kararlılık çözümlemesi, özyineli izdüşüm yöntemi (RPM) denen etkili bir sayısal yöntem kullanılarak yapılmıştır. RPM ilk önce güç sisteminin dinamiğinin benzetimi için kullanılan zaman erim benzetim yazılımının çıktılarını analiz eder ve yavaş veya kararsız çalışma kiplerini, sistem uzayının değişimsiz bir altuzayı olarak tanımlar. Bu değişimsiz altuzay üzerinde Newton yöntemi uygulanıp çözümün yakınsaması iyileştirilir. Kararlı kiplere ait tümleyen uzay üzerinde ise sabit-nokta dürümü uygulanmaya devam eder. Analiz, durum matrisinin özdeğerlerinin bulunmsı ve bunlardan genliği birden büyük olanlara karşılık gelen ve çözümün yakınsamasını sağlayacak olan tam dikgen temel oluşturarak yapılır. Bu yolla güç sistemlerinin analizinde kararlı ve doğruluğu yüksek olan bir çözüm elde edilir. Güç sisteminde bir hata oluştuğunda, RPM sayısal çözümün durağan duruma kısa zamanda ve salınımsız olarak erişmesini sağlar. RPM’in başarımı 6 baralı bir sistem üzerinde denenerek doğrulanmıştır.Çalışmalar Matlab ortamında, daha önce geliştirilmiş olan Güç Sistemleri Paketi kullanılarak yapılmıştır.
Anahtar kelimeler: Güç sistemleri kararlılığı, Özyineli İzdüşüm Yöntemi, Sayısal Çözüm Yöntemleri.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Electric Power System Stability
Electric Power Systems - System Analysis
Power System Analysis - Recursive Projection Method - Numerical Integration Methods
Power System Stability Analysis Using Recursive Projection Method
Thesis
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oai:i-rep.emu.edu.tr:11129/6802013-08-15T23:00:43Zhdl_11129_3
EMU I-REP
author
Moghaddam, Ali Farzan
2013-08-15T10:59:53Z
2013-08-15T10:59:53Z
2010
Moghaddam, Ali Farzan. (2010). Analysis of a Delay Compensated Deadbeat Current Controller for Inverters. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/680
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2010. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: Deadbeat control is one of the most attractive control techniques, as it exhibits very fast dynamic response. Deadbeat control has been widely applied in power electronics for Pulse Width Modulation (PWM) inverter. This control technique places all the system closed-loop poles at the origin of the z-plane. Hence, it can achieve fast dynamic response with low Total Harmonic Distortion (THD), even under nonlinear loads. In existing deadbeat control techniques for single-phase UPS inverters, the pulse width of the inverter output voltage is limited by the computation time of the controlling processor. With the development of power semiconductor devices that can switch at very high speeds, feedback control techniques have been considered for inverters in UPS systems. Classical open-loop techniques of obtaining sinusoidal output voltages are incapable of providing a satisfactory response with nonlinear or fast-changing loads. In this thesis current control of a single phase PWM inverter connected to the grid is studied. The main objectives of the control are that the current has minimum harmonic distortion and is in phase with the grid voltage. The control system should have fast dynamic response when distortion occurs and should be robust against drift in the system parameters. In this thesis delay problem of a dead beat current controller for inverter is investigated by applying the z-transform technique. A Simulink model is developed to investigate the performance of a control strategy proposed in the literature [1].
Keywords: PWM, THD, UPS, Deadbeat control.
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ÖZ: Ölüvuruş denetimi, çok hızlı dinamik tepki sergileyen bir yöntem olarak en yaygın denetim teknikleri arasındadır. Ölüvuruş denetimi yaygın olarak güç elektroniğinde Darbe Genişlik Modülasyonlu (DGM) çeviriciler için uygulanmıştır. Bu denetim tekniği sistemin kapalı döngü kutuplarını z-düzleminde sıfır noktasına yerleştirir. Dolayısıyla doğrusal olmayan yükler altında bile düşük Toplam Harmonik Distorsiyon (THD) ile hızlı dinamik tepkiye ulaşılabilir. Tek fazlı kesintisiz güç kaynağı (KGK) çeviricilerde uygulanan mevcut ölüvuruş denetim tekniklerinde, çevirici çıkış geriliminin darbe genişliği kontrol işlemcisinin hesaplama süresi ile sınırlıdır. Çok yüksek hızlarda anahtarlama yapabilen güç yarıiletkenlerinin geliştirilmesi ile, KGK sistemlerindeki çeviriciler için geri beslemeli denetim tekniklerinin uygulanması gündeme gelmiştir. Sinüs çıkış gerilimi elde etmek için uygulanan klasik açık çevrim teknikleri, hızlı değişen veya doğrusal olmayan yükler ile tatmin edici bir sonuç vermekte yetersiz kalmaktadır. Bu tez çalışmasında, şebekeye bağlı tek fazlı DGM çevirici için akım denetimi incelenecektir. Denetimin ana amaçları, akımın harmonik bozulmasını asgariye indirgemek ve şebeke voltajı ile olan faz kaymasının olmamasını sağlamaktır. Denetim sistemi yükteki oynamalar durumunda hızlı dinamik tepki vermeli ve sistem parametrelerindeki kaymalar karşısında dayanıklı olmalıdır. Bu çalışmada bir çevirici için uygulanan ölüvuruş akım denetleyicisinin gecikme sorunu z-dönüşümü tekniği kullanılarak incelenmiştir.
Anahtar Kelimeler: DGM, THD, KGK, Ölüvuruş denetim.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Power Electronics
Control Devices - Inverters
PWM - THD - UPS - Deadbeat Control
Analysis of a Delay Compensated Deadbeat Current Controller for Inverters
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/6832013-08-16T23:00:29Zhdl_11129_3
EMU I-REP
author
Konca, Mustafa
2013-08-16T07:14:09Z
2013-08-16T07:14:09Z
2010
Konca, Mustafa. (2010). Multi-Beam Patch Antenna Design. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/683
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2010. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: This thesis describes the design procedure of a circular microstrip antenna array to be used for wireless communications. The proposed antenna utilizes a novel feed network that enables the user to change the propagation direction by choosing one or more of the four input ports. Equilateral triangular patches are used as array elements to utilize the space efficiently around the circular feed network. Both the feed network and the radiating elements are placed on a 1.57 mm thick FR-4 substrate, which is suspended 5 mm above the ground plane. The antenna array is designed to operate at a center frequency of 2.45 GHz. Results show that single beams at eight different directions can be obtained by exciting certain combinations of input ports. Other combinations allow the array to radiate simultaneously in two directions. The dual-beam operation is possible in two different configurations. The steering angle is around 10o off the z-axis and the beamwidth is around 20o for all of the main beams. Gain values of up to 8.3 dB were obtained. Keywords: Circular antenna array, Triangular patch, Multi directional, Multi beam, Circular power divider.
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ÖZ: Bu tez, dairesel şekilde dizilmiş eşkenar üçgen elemanlardan oluşan bir basılı devre anten dizisi tasarımı ve bilgisayar modellemesi sonuçlarını içerir. Söz konusu anten uzak noktalardaki birimlerin esnek bir şekilde birbirleri ile iletişim kurmasına yarayacaktır. Anten dizisinde kullanılan basılı devre besleme ağı özgün bir tasarım olup, her elemanı değişik bir faz ile besleyerek antenin yayın yönünün değişmesini sağlar. Bu dairesel besleme şeridi üzerinde sağlanan dört değişik noktadan her birinin veya birkaçının kullanılması sonucunda anten yayın yönü seçilebilmektedir. Hem besleme ağı hem de anten dizisi 1.57 mm kalınlığındaki bir FR-4 plaka üzerine basılacaktır. Bu devre plakası toprak düzleminin 5 mm üzerine monte edilecektir. Bu anten dizisi 2.45 GHz merkez frekansında çalışmak üzere tasarlanmıştır. Sonuçlar, antenin değişik besleme noktaları kullanılarak, sekiz farklı yönde yayın yapabildiğini göstermiştir. Antenin aynı anda iki yöne yayın yapabilmesini sağlayan kombinasyonlar da mümkündür. Antenin yayın yönü yaklaşık olarak dikeyden 10 derece aşağıya kaydırılabilmektedir ve yayın alanı açısı yaklaşık olarak 20 derecedir. 8.3 dB’ye ulaşan kazanç değerleri elde edilmiştir. Anahtar Kelimeler: Dairesel anten dizisi, Üçgen panel anten, Çok-yönlü yayın, Dairesel besleme ağı.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Antennas (Electronics)
Circular Antenna Array - Triangular Patch - Multi Directional - Multi Beam - Circular Power Divider
Multi-Beam Patch Antenna Design
Thesis
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oai:i-rep.emu.edu.tr:11129/11192016-02-04T07:28:27Zhdl_11129_817
EMU I-REP
author
Uyguroğlu, Mustafa
author
Demirel, Hasan
2013-10-01T08:38:31Z
2013-10-01T08:38:31Z
2005-06
Uyguroglu, Mustafa, Demirel, Hasan (2005). TSAI–TOKAD (T–T) Graph: The Combination of Non-Oriented and Oriented Graphs for the Kinematics of Articulated Gear Mechanisms. Meccanica, 40 (3), 223-232.
Online: 1572-9648
Print: 0025-6455
DOI: 10.1007/s11012-005-4023-8
http://hdl.handle.net/11129/1119
http://dx.doi.org/10.1007/s11012-005-4023-8
Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s11012-005-4023-8) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.
ABSTRACT : The non-oriented and oriented linear graph techniques are used for the kinematic analysis of bevel-gear trains. In this paper, these two techniques are compared and the weaknesses of each technique are shown. In order to overcome the weaknesses of these techniques a new graphical technique called Tsai–Tokad (T–T) graph is introduced incorporating the important feature of the non-oriented graph which helps to determine the transfer vertex and the oriented graph technique. The theory is demonstrated by the kinematic analysis of articulated robotic mechanism used by Cincinnati Milacron T³.
en
Meccanica: An International Journal of Theoretical and Applied Mechanics, AIMETA / Springer
© Springer 2005
info:eu-repo/semantics/closedAccess
info:eu-repo/semantics/closedAccess
Geared Wrist Manipulators - Kinematic Analysis - Mechanics of Machines - Oriented and Non-Oriented Graphs
Mechanical Engineering - Mechanics
TSAI–TOKAD (T–T) Graph: The Combination of Non-Oriented and Oriented Graphs for the Kinematics of Articulated Gear Mechanisms
article
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oai:i-rep.emu.edu.tr:11129/11292013-11-20T06:51:17Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
2013-10-03T06:48:05Z
2013-10-03T06:48:05Z
2009-11
Amca, Hasan. (6-7 Kasım 2009). Vakıf Üniversitelerinde Kontenjan Boşluğunun Nedenleri ve İleriye Dönük Tehlikeler. 19. Mühendislik Dekanları Konseyi, Samsun, Türkiye
http://emu.edu.tr/amca
http://hdl.handle.net/11129/1129
Turkish (Türkçe)
Samsun 19 Mayıs Üniversitesi / 19. Mühendislik Dekanları Konseyi (MDK)
Vakıf Üniversiteleri - Kontenjanlar
Vakıf Üniversiteleri - Kuzey Kıbrıs Türk Cumhuriyeti
Vakıf Ünivesiteleri - Kontenjan Boşluk Sebepleri
19. Mühendislik Dekanları Konseyi
Vakıf Üniversitelerinde Kontenjan Boşluğunun Nedenleri ve İleriye Dönük Tehlikeler
Presentation
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http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1129/3/Vak%C4%B1f+%C3%9Cniversitelerinde+Kontenjan+Bo%C5%9Flu%C4%9Funun+Nedenleri+Ve+%C4%B0leriye+D%C3%B6n%C3%BCk.ppt.txt
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Vakıf Üniversitelerinde Kontenjan Boşluğunun Nedenleri Ve İleriye Dönük.ppt.txt
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oai:i-rep.emu.edu.tr:11129/11232013-11-20T06:50:12Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
2013-10-02T07:49:23Z
2013-10-02T07:49:23Z
2009
Amca, Hasan. (23-24 Ekim 2009). Teknoloji Liginin Neresindeyiz. Bilişim Adası Çalıştayı, Girne, Kıbrıs.
http://hdl.handle.net/11129/1123
Turkish (Türkçe)
Bilişim Adası Çalıştayı / KKTC Bayındırlık ve Ulaştırma Bakanlığı
Teknoloji - İnnovasyon - Kıbrıs, Kuzey
Bilim - Bilimsel Gelişme - Kıbrıs, Kuzey
Teknoloji Liginin Neresindeyiz
Presentation
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URL
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oai:i-rep.emu.edu.tr:11129/11462013-10-04T23:00:52Zhdl_11129_388hdl_11129_390
EMU I-REP
author
Amca, Hasan
2013-10-04T09:43:03Z
2013-10-04T09:43:03Z
2001-03
Hasan AMCA, "Information Technology in Education", International Information Technology
Workshop, 17-18 March 2001, Ledra Palace, Nicosia, Cyprus.
http://hdl.handle.net/11129/1146
Authors Contact Information: Email: hasan.amca@emu.edu.tr, Web: http://sct.emu.edu.tr/amca
Abstract: Latest advances in the Information
Technology (IT) opened up a new era, “The Digital Age”, in which every business had to adapt promptly to these advances or lose the competition. Education systems, lying in the heart of all businesses, must also be upgraded so as to supply the personnel demanded by the industry. Here, we discuss the influence of Information Technology (IT) and Instructional Technology on the
current education system and the adaptation procedures to the future.
en
International Information Technology Workshop
Education
Teaching and Learning
Information Technology
Learning - Digital World
Future Education
Pedagogy
Information Technology in Education
Research Paper
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oai:i-rep.emu.edu.tr:11129/11702016-01-06T08:13:48Zhdl_11129_817hdl_11129_1172
EMU I-REP
author
Bayraktar, Fatih
author
Amca, Hasan
2013-10-07T11:08:10Z
2013-10-07T11:08:10Z
2012-05-01
Bayraktar, Fatih, Amca Hasan (2012). Interrelations Between Virtual-World and Real-World Activities: Comparison of Genders, Age Groups,and Pathological and Nonpathological Internet Users. Cyberpsychology, Behavior, and Social Networking, 15 (5), pp. 263-269.
Print: 2152-2715
Online: 2152-2723
http://hdl.handle.net/11129/1170
The file in this item is the publisher version (published version) of the article.
ABSTRACT: After the Internet Revolution, people have started to spend most of their everyday time online carrying out
virtual activities. A limited number of studies tried to answer whether virtual activities match our real-world
(RW) activities. Moreover, to our knowledge, there was no study that dealt with these interrelations between
virtual and RW activities among the pathological and nonpathological users of the Internet (i.e. PIUs and
NPIUs). The primary aim of this study was to fill this gap and to investigate the correlations between virtualworld
(VW) and RW activities among PIUs and NPIUs. The secondary aim was to examine the perceptions of
the Internet and motivations to go online for PIUs and NPIUs. The third aim was to compare virtual and RW
activities across gender and age groups. The results indicated that correlations between most of the activities in
RW and VW were high among men and women, among age groups, and also among PIUs and NPUs. However,
beyond these similarities, perceptions of the Internet and motivations to browse into VW were differed among
PIUs and NPIUs. In other words, PIUs, but not NPIUs, perceived VW activities more gratified and had motivations
to go online for gratified functions.
en
CyberPsychology, Behavior & Social Networking / Mary Ann Liebert, Inc. Publishers
Internet - Interpersonal Relations
Internet Users - Behavior, Addictive - Motivation - Psychology
Adolescent - Adult - Age Factors - Female - Humans - Male - Questionnaires - Sex Factors - User-Computer Interface
Interrelations Between Virtual-World and Real-World Activities: Comparison of Genders, Age Groups,and Pathological and Nonpathological Internet Users
Article
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oai:i-rep.emu.edu.tr:11129/11832013-10-07T23:00:24Zhdl_11129_819
EMU I-REP
author
Amca, Hasan
2013-10-07T13:38:50Z
2013-10-07T13:38:50Z
2011-12
Amca, Hasan. (Aralık 2011). Cep Telefonlarından veya Baz İstasyonlarından Değil, Yanlış Kurulan ve Standartlara Uymayan Sistemlerden Korkunuz. Üniversitem Gazetesi, s. 3.
http://hdl.handle.net/11129/1183
Turkish (Türkçe)
Doğu Akdeniz Üniversitesi Halkla İlişkiler ve Basın Müdürlüğü
Mobil Haberleşme, İletişim – Kablosuz İletişim
Cep Telefonları – Baz İstasyonları – İnsan Sağlığına Etkileri
Cep Telefonlarından veya Baz İstasyonlarından Değil, Yanlış Kurulan ve Standartlara Uymayan Sistemlerden Korkunuz
Newspaper (Gazete)
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oai:i-rep.emu.edu.tr:11129/12012013-11-20T06:48:45Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
2013-10-09T13:50:12Z
2013-10-09T13:50:12Z
2012-11
Amca, Hasan. (29-30 November 2012). Education the Future Engineers. 7th ARCHENG International Architecture and Engineering Symposium, Lefke, Kibris.
http://hdl.handle.net/11129/1201
Prof. Dr. Hasan AMCA was the key-not speaker of the Symposium.
en
The European University of Lefke
Enginnering - Perspectives - World - World in the Future
Engineering Areas
Social Challenges
Different Nations
Engineering Jobs
Cultural Challenges
Education the Future Engineers
Presentation
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URL
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oai:i-rep.emu.edu.tr:11129/12032013-10-10T23:00:23Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Jönsson, Anders
2013-10-10T09:12:47Z
2013-10-10T09:12:47Z
2005-07
Hasan AMCA and Anders JÖNSSON, “E-Commerce: How Can Businesses Benefit From E-Commerce?” International Conference on Contemporary Issues in Information Technology in OIC Member States, July 26-27, 2005, Islamabad, Pakistan.
http://hdl.handle.net/11129/1203
About Authors: Hasan Amca, Dean of Facult of Engineering, Eastern Mediterranean University, Famagusta,TRNC. and Anders Jönsson, E-Commerce Specialist, UNDP Partnership for the Future, Nicosia,Cyprus.
E-business in general and e-commerce in particular is changing the way people do business and sell their product and services to the entire world without the need of physically existing around the globe. As enterprises exploit business opportunities via the Internet, they have discovered that not only they need a reliable and scalable IT infrastructure to support their online business, but also they must have the capability to deploy new online applications rapidly and integrate e-commerce to their already existing business model. The paper concentrates on the description of e-commerce, how businesses transform to
e-commerce and the technical details about the necessary IT infrastructure, business model for the transformation, payment schemes and success factors.
en
International Conference on Contemporary Issues in Information Technology in OIC Member States
Global Economics - E-Commerce - E- Business
E-Commerce - Technology
E- Commerce - Legal Framework
Security, Payment Issues
E-Commerce - Business
Commercial Networks
Business Opportunities
Attractive Market
E-Commerce: How Can Businesses Benefit From E-Commerce?
Conference Paper
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HasanAmcaConferencePaper1.txt
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oai:i-rep.emu.edu.tr:11129/12212013-11-13T00:00:31Zhdl_11129_3
EMU I-REP
author
Jazayeri, Kian
2013-11-12T11:05:51Z
2013-11-12T11:05:51Z
2012
Jazayeri, Kian. (2012). Determination of Power Losses in Solar Panels Using Artificial Neural Network. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1221
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: The world’s traditional energy resources remain insufficient with respect to the increasing energy requirements of the modern era. In recent decades the threats and limitations associated with energy resources such as fossil fuels have motivated researches to find alternative clean and sustainable energy resources. Concentrated solar power is considered as one of the most competitive and rapidly growing renewable energy resources which emerge to meet the modern world’s increasing energy requirements. Along with the rising demand for alternative energy resources, the technologies and methods regarding utilization of solar energy have been the subject of many scientific works recently. Solar panels made of solar cells generate electrical power from sun’s radiations and developing management and controlling techniques for solar panels plays a major role in benefitting from solar energy. The purpose of this study is to develop an intelligent fault detection system which provides possibilities of real time monitoring and fault detection of solar panels.
Utilizing artificial neural network technology, the intelligent solar panel fault detection system is capable of perceiving sun’s position in the sky and estimating the corresponding output power of a solar panel based on algorithms derived by the artificial neural network which has been trained on solar data at several time intervals. The system being capable of operating in any geographical location provides possibilities of 24-hour monitoring and fault detection as well as future power estimations for solar panels.
Keywords: Renewable Energy, Photovoltaic, Solar Energy, Solar Panel/Cell, Intelligent Fault Detection, Artificial Neural Network, Output Power Estimation.
…………………………………………………………………………………………………………
ÖZ:Modern asrın artan enerji ihtiyaçları dikkate alındığında dünyanın geleneksel enerji kaynaklarının yetersiz kaldığı görülmektedir. Son yıllarda özellikle fosil yakıtlar ve buna benzer enerji kaynaklarına yönelik olan sınırlamalar ve tehditler, araştırmaların alternatif temiz ve sürdürülebilir enerji kaynakları üzerinde yoğunlaşmasına neden olmuştur. Yoğunlaştırılmuş güneş enerjisi, modern dünyanın artan enerji ihtiyaçlarını karşılamak üzere alternatif olarak düşünülen, rekabet gücü en yüksek olan ve hızlı bir şekilde büyüyen yenilenebilir bir enerji kaynağı konumundadır. Alternatif enerji kaynaklarına yönelik olan taleplerin artması ile birlikte, güneş enerjisinin kullanımı ile ilgili olan teknoloji ve yöntemler de birçok bilimsel çalışmaya konu olmuştur. Güneş hücrelerinden oluşan güneş panelleri, güneş ışınlarından elektrik enerjisi üretmekte olup bu panellere yönelik gelişme yönetimi ve kontrol teknikleri güneş enerjisinden yararlanma yönünde önemli bir rol oynamaktadır. Bu çalışmada güneş panelleri için gerçek zamanlı izleme ve hata belirleme olanaklarını sağlayan akıllı bir hata belirleme sisteminin geliştirilmesi amaçlanmaktadır. Yapay zeka ağları teknolojisinden yararlanılarak güneş panelleri için tasarlanan akıllı hata blirleme sistemi, güneşin gökyüzündeki konumunu algılama ve çeşitli zaman aralıklarında toplanan solar bilgiler ile eğitilmiş olan yapay zeka ağları tarafından elde edilen algoritmalara dayanarak ilgili çıkış güçlerini tahmin etme kabiliyetine sahip olmaktadır. Herhangi bir coğrafi konumda çalışma kabiliyetine sahip olan sistem, güneş panellerine yönelik 24 saat izleme ve hata belirleme olanaklarının yanısıra güç tahmin olanaklarını da sağlamaktadır.
Anahtar Kelimeler : Yenilenebilir Enerji, Güneş Enerjisi, Güneş Paneli/Hücresi, Akıllı Hata Belirleme, Yapay Zeka Ağları, Güç Tahmini.
en
Eastern Mediterranean University (EMU)
Electrical and Electronic Engineering
Electric Power Production - Solar Energy
Renewable Energy - Photovoltaic - Solar Panel/Cell
Intelligent Fault Detection - Artificial Neural Network - Output Power Estimation
Determination of Power Losses in Solar Panels Using Artificial Neural Network
Thesis
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oai:i-rep.emu.edu.tr:11129/12452014-01-30T00:00:13Zhdl_11129_389
EMU I-REP
author
Amca, Hasan
2014-01-29T08:32:28Z
2014-01-29T08:32:28Z
2004-10-26
Amca, Hasan. (Ekim 2004). Akademik Değerlendirme Kıstasları’nın Doğu Akdeniz Üniversitesi İçin Önemi, Avantajları, Dezavantajları ve İlgili Kıstasların İyileştirilmesi İçin Öneriler. DAÜ-Üniversite Yönetim Kurulu
http://hdl.handle.net/11129/1245
Doğu Akdeniz Üniversitesi, Üniversite Yönetim Kurulu’nda
başlatılan bir tartışma sonucu, Yönetim Kurulu tarafından
Bilgisayar ve Teknoloji Yüksek Okulu Müdürü Doç. Dr. Hasan
AMCA’dan ADEK’in neden DAÜ için faydalı olduğu, 2000
yılında ADEK kurulduğundan bu yana kıstasların kullanımından
dolayı Üniversite’de ne gibi gelişmelerin kaydedildiği ve
Akademik Değerlendirme Kıstasları olmasaydı aynı gelişmelerin
olup olamayacağı konularını içeren bir rapor hazırlaması istenmiştir.
Bu çalışma, Doğu Akdeniz Üniversitesi Yönetim Kurulu’nda,
Akademik Değerlendirme Kıstasları’nın (Kriterleri’nin)
akademik yükseltmelerde yetersiz olduğu ve sistemde tıkanıklık
yarattığı iddialarının ortaya atılmasıyla yaratılan kavram
kargaşasını ortadan kaldırmak amacıyla hazırlanmıştır. Sorun;
yönetim yetmezliğinden ve uygulama yanlışlıklarından
kaynaklanan hatalardan dolayı ortaya çıkan olumsuz sonuçlardan
haksız yere ADEK’in sorumlu gösterilmesinden kaynaklanmaktadır.
Doğu Akdeniz Üniversitesi tarihinin en başarılı uygulama
örneklerinden biri olan ADEK’in bu tür yanlış ve asılsız
saptamalarla hedef haline getirilmesinden DAÜ'nün kurumsal
anlamda büyük zarar göreceği aşikardır.
Bu rapor, ADEK’in kuruluş amaçlarını, gelişmiş akademik
yapılardaki ADEK benzeri uygulamaları, ADEK’in DAÜ'ye
kazandırdıklarını ve yönetim ile öğretim üyeleri arasında
akademik barışın tesisine nasıl olumlu anlamda katkı koyduğunu açıklayabilmek amacıyla hazırlanmıştır.
other
Doğu Akdeniz Üniversitesi-ÜYK
DAÜ - Akademik Değerlendirme Sistemi
DAÜ - Akademik Değerlendirme Sisteminin Gerekçeleri
DAÜ - Öğretim Üyelerinin Akademik Performans Değerlendirmeleri
DAÜ - Akademik Yükseltmeler
ADEK - Akademik Değerlendirme Sistemi
Akademik Yükseltmelerde Yaşanan Tıkanıklıklar
Akademik Değerlendirme Kıstasları’nın Doğu Akdeniz Üniversitesi İçin Önemi, Avantajları, Dezavantajları ve İlgili Kıstasların İyileştirilmesi İçin Öneriler
Technical Report
Working Paper
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URL
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Akademik Degerlendirme Kistaslarinin DAU İcin Önemi, Avantajlari, Desavantajlari ve iyilestirilmesi icin Gerekli Calismalar.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1245/1/Akademik+Degerlendirme+Kistaslarinin+DAU+%C4%B0cin+%C3%96nemi%2C+Avantajlari%2C+Desavantajlari+ve+iyilestirilmesi+icin+Gerekli+Calismalar.pdf
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Akademik Degerlendirme Kistaslarinin DAU İcin Önemi, Avantajlari, Desavantajlari ve iyilestirilmesi icin Gerekli Calismalar.pdf
oai:i-rep.emu.edu.tr:11129/20592016-02-04T07:18:40Zhdl_11129_1952hdl_11129_817
EMU I-REP
author
Amca, Hasan
author
Rızaner, Ahmet
author
Hacıoğlu, Kadri
author
Ulusoy, Ali Hakan
2016-02-04T07:13:53Z
2016-02-04T07:13:53Z
2006-01
Hasan Amca, Ahmet Rizaner, Kadri Hacıoğlu, Ali H. Ulusoy, (2006)"Training Sequence Aided Signature Waveform Estimation", Wireless Personal Communications, 36:(1) 45–57.
1572-834X (online)
0929-6212 (print)
DOI: 10.1007/s11277-006-7533-3
http://dx.doi.org/10.1007/s11277-006-7533-3
http://hdl.handle.net/11129/2059
Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s11012-005-4023-8) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.
In code division multiple access channels multiuser detection techniques are known to be effective strategies
to counter the presence of multiuser interference towards improving spectral efficiency. Generally, multiuser
detectors can provide excellent performance only when the signature waveforms† of all users are precisely known.
Hence, the estimation of signature waveforms is a challenging issue in mobile communication systems. In this
paper, we compare the performance of two short training sequence aided signature waveform estimators. One
is maximum likelihood type signature waveform estimator that requires the knowledge of spreading sequences
and short training sequences. The other estimator is recently proposed based on subspace method and requires
the knowledge of training sequences only. Through the simulations, we show the signature waveform estimation
performance of both systems and the effect of the estimation error on the performance of a multiuser detector. The
complexity comparisons of both systems are also given.
en
Wireless Personal Communications, Springer
CDMA
multipath channel
signature waveform estimation
Training Sequence Aided Signature Waveform Estimation
Article
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oai:i-rep.emu.edu.tr:11129/12842014-09-02T23:00:35Zhdl_11129_3
EMU I-REP
author
Jaafar, Hussein Mohammed
2014-09-02T08:10:29Z
2014-09-02T08:10:29Z
2014
Jaafar, Hussein Mohammed. (2014). Broadband bow-tie antenna with tapered balun. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1284
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
ABSTRACT: In microwave applications spectrum Industrial, Scientific and Medical (ISM) band, especially in wireless communication systems applications such as GSM, 3G, Wi-Fi and Wi-MAX applications, high antenna characteristics such as high gain and wide bandwidth are required. In this thesis, a broadband Bow Tie Antenna (BTA) with high performance characteristics has been designed, to cover the wireless application requirements. One of the fundamental problems of the transmission line in the antenna system is the power loss due to the radiation which occurs on the feed excitation. This kind of transmission lines is called Unbalance Transmissions Lines (UTL). To reduce the power radiation on transmissions lines, in other words, to modify transmission line from unbalance to balance (BTL), i.e. UTL-to-BTL transition, the ―balun technique‖ can be used. In this study, for UTL bow tie antenna with Microstip Line (MSL) and coaxial cable feeds have been used. On the other hand for BTL bow tie antenna with Coplanar Strips line (CPS) feed has been used. Two kinds of taper impedance matching techniques have been applied to reduce reflection in the signal. A broadband BTA antenna with dual bands has been designed and simulated having the bandwidth 1.89-3.25 GHz and 3.5-3.67 GHz for operating frequency 2.45 GHz. Maximum gain achieved at 2 GHz which is equal to 6.9 dB and the gain for 2.5 GHz, 3 GHz, and 3.5 GHz, are equal to 4.8 dB, 5.1 dB, and 3.8 dB respectively. Keywords: Broadband Antenna, BTA, bow tie, Wireless Applications, UTL, BTL, Balun, taper, Microstrip line to Coupled Transitions.
………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Birçok mikrodalga uygulamasında (ISM band), özellikle 3G, Wi-LAN ve Wi-MAX kablosuz haberleşme alanlarında kullanılan antenlerde yüksek kazanç, geniş band gibi yüksek performans özellikleri aranmaktadır. Bu tez çalışmasında kablosuz haberleşme alanıda kullanılabilecek genişband ve yüksek kazanç özelliklerine sahip papyon anten tasarlanmıştır.
Anten sistemlerinde en temel sorunlardan biri, besleme mikroşerit hattaki radyasyondan kaynaklanan güç kayıbıdır. Bu tür iletim hatları dengesiz iletim hattı olarak adlandırılır (Unbalance Transmission Line, UTL). İletim hatlarındaki bu güç kayıbını önlemek için, diğer bir deyişle, iletim hattını dengesiz durumdan dengeli (Balanced Transmission Line, BTL) duruma çevirmek için (UTL-BTL) ―balun tekniği‖ kullanılmaktadır. Bu çalışmada, UTL için mikroşerit ve ortak eksenli kablo beslemeli papyon anten, BTL için ise eş düzlemli şerit kablo beslemeli popyon anten kullanılmıştır. Ayrıca, iki tür konik empedance uyumlama tekniği uygulayarak yansıma sinyalinin azalması sağlanmıştır.
2.45 GHz frekası için, 1.89-3.25 GHz ve 3.5-3.67 GHz band genişlikleri olan çift band BTA tasarlanmıştır. En yüksek kazanç 2 GHz’te 6.9 dB olarak elde edilmiştir. Kazanç, 2.5 GHz, 3 GHz, ve 3.5 GHz frekanslarında ise sırası ile 4.8 dB, 5.1 dB, ve 3.8 dB’dir. Anahtar Kelimeler: Genişband Anten, BTA, papyon, Kablosuz Uygulamalar, UTL, BTL, Balun, konik, Microstrip line to Coupled Transitions.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Antennas (Electronics)
Broadband Communication Systems - Antennas
Broadband Antenna, BTA, Bow Tie, Wireless applications, UTL, BTL, Balun, Taper, Microstrip Line to Coupled Transitions
Broadband bow-tie antenna with tapered balun
Thesis
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oai:i-rep.emu.edu.tr:11129/12912014-09-11T23:00:38Zhdl_11129_3
EMU I-REP
author
Akhbardeh, Farhad
2014-09-11T08:35:15Z
2014-09-11T08:35:15Z
2014-02
Akhbardeh, Farhad. (2014).K-means clustering based angiographic image analysis to measure coronary stenosis. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1291
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assoc. Prof. Dr. Hasan Demirel.
ABSTRACT: Medical imaging uses techniques or processes which use human body images for clinical or medical science. Medical imaging has a wide range of applications in the field of radiology, angiography and angiogram imaging. Nowadays, angiography and computerized tomography (CT) scans are two common methods that are used by doctors for the detection of coronary artery stenosis (artery blockage) in medical imaging. Most of the detection processes in medical imaging are performed by analyzing digital images generated through angiography and CT scan processes. Currently most of the diagnoses are performed by doctors after manual inspection of real time frames of the video generated by the respective medical imaging systems. In this thesis we propose to use digital image processing techniques in detection and categorization of the clogs in the arteries (stenosis/blockage) by using the frames generated from the X-ray angiography. Utilized image pre-processing methods includes selecting a line of Interest (LOI) on blocked vessel and further selection of the region of interest (ROI) on that area, then automatically cropping the region of interest followed by Gaussian filtering for smoothing. In the post processing, three alternative methods are proposed to measure the stenosis in the vessel. The first method applies thresholding to extract the vessel of interest. The extracted vessel is analyzed for the calculation of the stenosis in percentage. The second method utilizes segmentation of the vessel tissue over the extracted pixels of ROI. The final method uses K-means clustering to differentiate between the vessel regions and non-vessel regions. Among the proposed methods K-means clustering based method outperforms the thresholding and segmentation methods. The performance of the proposed methods is compared with the manually measured objective results and doctor’s opinion which can be considered a subjective score. The results indicate that the proposed methods are reliable alternatives to aid the doctors in deciding reliable stenosis scores. K-means based method produces the best average performance on the evaluated vessels with stenosis. A new metric, Maximum Percentage Error Ratio (MPER), in decibels is proposed to indicate the quality of the decisions regarding the generated stenosis (%) using different methods. K-means based method generates the highest performance in terms of MPER.
Keywords: Medical image processing, X-ray angiography, angiography imaging, segmentation, thresholding, K-means clustering, stenosis in heart vessels.
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ÖZ: Tıbbi görüntülemede insan vücuduna ait imgeler farklı teknikler ve süreçler ile klinik ve tıbbi bilim tarafından kullanılmaktadır.Tıbbi görüntüleme radyoloji, anjiografi ve anjiyogram görüntüleme alanında geniş bir uygulama yelpazesine sahiptir. Günümüzde, anjiyografi ve bilgisayarlı tomografi (BT) taramaları tıbbi görüntülemede koroner damar darlığı (damar tıkanıklığı) tespiti için doktorlar tarafından kullanılan iki yaygın yöntemlerdir. Tıbbi görüntüleme algılama süreçlerinde genellikle anjiyografi ve BT tarama ile üretilen sayısal görüntüler analiz edilmektedir. Günümüzde, doktorlar muayene sırasında tanı ortaya koyabilmek için ilgili medikal görüntüleme sistemleri tarafından üretilen video çerçeve imgelerini kullanmaktadırlar. Bu tezde, sayısal imge işleme teknikleri kullanarak X-ışını kaynaklı anjiyografi imgelerini işlenerek damar darlığı (damar tıkanıklığı) tespiti ve sınıflandırılması için kullanılmasını öneriyoruz. Kullanılan görüntü işleme yöntemleri sırasıyla: daralmanın oluştuğu damar üzerinden ilgi çizgisinin seçimi (LOI), bu çizgi etrafında ilgi alanının çıkarımı (ROI) daha sonra bu bölgenin kırpılması ile daha sonraki işlemler için ön işlem tamamlanır. Sonraki aşamada, Gauss filtresi kullanılarak bölge düzgünleştirilir. Düzgünleştirilen imgedeki damar içerisindeki daralmanın ölçülebilmesi için üç farklı yöntem onerilmektedir. İlk yöntem, ilgi konusu damarın çıkarımı için eşikleme yöntemi uygulamaktadır. Çıkarılan damar imgesi analiz edilerek damar daralması yüzdelik olarak hesaplanmaktadır. İkinci yöntem ROI üzerinden eşiklenerek çıkarılan piksellerin gerçek değerlerinin bölütleyerek damar daralmasını hesaplamaktadır. Önerilen, son yöntemde K-ortalamalar kümeleme yöntemi kullanılarak, bölgeler damar içeren ve damar içermeyen bölgeler olarak ikiye ayrılmaktadır. Önerilen yöntemler arasında K-ortalamalar kümeleme tabanlı yöntem, eşikleme ve segmentasyon tabanlı yöntemleri geride bırakmaktadır. Önerilen yöntemlerin performansı, elle ölçülmüş objektif sonuçlar ve sübjektif ölçüm olarak kabul edilebilir doktor görüşü ile karşılaştırılmaktadır. Sonuçlar önerilen yöntemlerin damar darlığı tespitinde karar aşamasında doktorlara yardımcı olabilecek güvenilir alternatifler oluşturduğunu göstermektedir. K-ortalamalar bazlı yöntem daralma bulunan damarlardaki darlık ölçümünde en iyi performansı göstermektedir. Farklı yöntemlerle hesaplanan darlık yüzdelerinin (%) ne kadar sağlıklı olduğunu ortaya çıkarabilmek için decibel olarak ölçülen, Maksimum Yüzde Hata Oranı (MPER), diye adlandırdığımız yeni bir metrik önerilmiştir. K-ortalamalar temelli yöntem MPER açısından en yüksek performansı göstermektedir.
Anahtar Kelimeler: Tıbbi İmge işleme, X-ışını anjiyografi, anjiyografi görüntüleme, bölütleme, eşikleme, K-ortalamalar kümeleme, kalp damarlarında darlık.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Imaging systems in medicine
Computer vision in medicine
Diagnostic imaging - Digital techniques - Data Processing
K-means clustering based angiographic image analysis to measure coronary stenosis
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/13112014-09-15T23:00:49Zhdl_11129_3
EMU I-REP
author
Elias, Bashar Bahaa Noori Qas
2014-09-15T11:04:18Z
2014-09-15T11:04:18Z
2014-01
Elias, Bashar Bahaa Noori Qas. (2014). Analysis of different structures of patch antennas. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1311
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
ABSTRACT: In this thesis, Method of Moment (MoM) based FEKO software version 5.5 was used to simulate patch antennas in different structures. For patch antennas, some of the fields are in the substrate and some of them in air. Due to this reason, it is necessary to calculate the effective dielectric constant which affects the resonant frequency and the wavelength of the wave in the substrate. Simulations were carried out to compute the value of effective dielectric constant of a single substrate layer which has a relative permittivity equal to 2.2 by making use of the standing wave pattern (SWP) generated by FEKO. After that, microstrip patch antennas were simulated based on multi-substrate layers instead of a single layer. Square, circular and triangular patches were simulated by FEKO and the resonant frequencies obtained were compared with other published (experimental, analytical, simulations by other methods) works. The results are close (from 1 to 3GHz difference) for different modes of the circular patch, while they were equal at 4.02 GHz and 7.03 GHz for the triangular and square patches respectively. Slot antennas are used to enhance the bandwidths, but slots may affect the relative permittivity. i.e. the effective permittivity. Triangular and square shape slot antennas were simulated by FEKO and the results were compared among themselves and with the published result for the triangular slot. The results very close. Slots on the patch are widely used. Here a triangular slot for various heights was simulated by FEKO for the rectangular patch. If has been observed that the resonance frequency reduces by the increase of the height. The optimum height for the given design was recorded. Also, circular slots were applied inside the circular patch to improve the return loss, voltage standing wave ratio and the bandwidth. Defected ground structures (DGS) in different shapes (rectangular, phi-shape, c-shape and plus-shape) were used to solve the surface wave problem which is a drawback for patch antennas. The use of this method resulted in gain enhancement.
Gain was enhanced by using patch antenna array topology. In this thesis, a 4 element array antenna was designed at 2 GHz and simulated by FEKO. A maximum gain of 13.1dB dB was achieved. Keywords: Effective Dielectric Constant, Gain, return loss, Patch Antenna, Patch Array Antenna.
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ÖZ: Bu tez çalışmasında Moment Metodu temelli FEKO yazılım programı kullanılarak, değişik yama antenlerin simülasyonu yapılmıştır. Yama antenlerde, sıçramadan ötürü elektrik alanının bir kısmı dielektrik içerisinde iken, bir kısmı havaya sıçradığından , efektif dielektrik sabiti, bağıl permitivite değerinden farklılık gösterir. Efektif dielektrik sabitinin resonant frekansına etkisi bilindiğinden, FEKO simülatörü kullanılarak elde edilen durgun dalga grafiği aracılığı ile bağıl permitivite değeri 2.2 olan bir dielektriğin, efektif değeri hesaplanıp, literatür değerleri ile karşılaştırma yapılmıştır. Daha sonra, çok katmanlı dielektrik maddeler için de benzer çalışma yapılmıştır. Kare, daire ve üçgen yama antenler FEKO simülatörü kullanılarak resonat frekansı hesaplamaları yapılmış, litedatürdeki benzeri tasarım değerlerine uygumlu neticeler elde edilmiştir. Daire yama anten için resonant değerinde 1-3GHz gibi bir fark mevcutken, üçgen ve kare yama anten resonant değerleri eşit bulunmuştur. Delik antenler, genişband elde etmek için kullanılmaktadır ancak, efektif permitivite değerinin hesaplanması gerekmektedir. FEKO simülatörü kullanılarak üçgen ve dikdörtgen delik antenlerin efektif permitivite değerleri hesaplanmış ve yayınlanmış değerlere çok yakın değerler elde edilmiştir. Yama antenlede yarıklar sıkça uygulanmaktadır. FEKO simülatötü aracılığı ile değişik yüksekte üçgen yarıklar uygulanmış, yarıkların yükseklikleri arttıkça resonant frekansının azaldığı gözlemlenmiş ve geri dönüş kayıbı için en iyi tasarım hükseklik değeri tesbit edilmiştir. Ayrıca, daire yama antene uygulanan dairesel yarıkların resonat frekansı ve geri dönüş yansıma katsayısı üzerindeki etkileri incelenmiştir. Referans iletken üzerinde dikdörtgen, C ve + şeklinde boşluklar açarak anten kazancı artırılmıştır. Dizi yama antenler kullanılarak anten performansını artırmak mümkündür. Bu tezde 2GHz frekansında dört elemanlı bir dizi anten tasarımı önerilmiş, 13.1 dB değerinde maximum kazanç elde edilmiştir. Anahtar Kelimeler: Efektif dielektrik sabiti, Kazanç, geri dönüş kazancı, yama anten, dizi anten.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Patch antennas
Antenna arrays
Antennas (Electronics)
Effective Dielectric Constant, Gain, Return Loss, Patch Antenna, Patch Array Antenna
Analysis of different structures of patch antennas
Thesis
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URL
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EliasBashar.pdf.txt
URL
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oai:i-rep.emu.edu.tr:11129/13242014-09-17T23:00:38Zhdl_11129_3
EMU I-REP
author
Hussein, Ahmed Ali
2014-09-17T05:20:00Z
2014-09-17T05:20:00Z
2014-02
Hussein, Ahmed Ali. (2014). Analysis of cross-talk and discontinuity problems in microstrip lines. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1324
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
ABSTRACT: In this thesis, microstrip line problems such as crosstalk and discontinuity that may occur in the microwave circuits have been studied in line with the literature and simulations have been carried out by using FEKO 5.5 full wave simulation software. The crosstalk problem is studied in three sections. The first section deals with the effect of placing rectangular trace between the strips, which is connected to the ground. With the proposed design 7dB of reduction has been observed in the Far-End crosstalk (FEXT). In the second section, perpendicular rectangular metals with Via fences connected to the Guard trace (RVG) have been used and FEXT enhancement of 7dB was observed. In the last section, Cross shape metals with via fence were connected by Guard trace (CVG) and The FEXT was reduced by 8dB. The results are compared with spacing rule results for S = 3W.
The discontinuity problem that occurs in right angle and step-width microstrip lines may be reduced by two types of chamfered methods. i.e. angle chamfered and tapered chamfered methods. In this study, a novel design has been applied to reduce the discontinuity problem by using tapered line on both sides of transmission lines. Simulation results show an improvement in reflection coefficient for 23 GHz (7-30) GHz bandwidth (BW) when compared with the step-width without chamfered. For the bend discontinuity, it was found out that the improvement in the reflection coefficient with a 70% chamfered ratio compared with 50% ratio is about 4dB for 70 GHz BW. Keywords: Coupling, FEXT, NEXT, Microstrip discontinuity, FEKO, RVG, CVG, Chamfer, taper, Via fence.
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ÖZ: Bu tez çalışmasında, mikroşerit devrelerdeki iletim hatlarında görülen çapraz girişim ve kesintilerden oluşan problemler ele alınmış; FEKO 5.5 yazılım paketi ile benzetişim yapılmış ve sonuçlar yayınlanmış sonuşlarara gore değerlendirilmiştir. Çapraz girişimle ilgili çalışma üç bölümden oluşmaktadır. Öncelikle, iki şerit arasına, referans metale temas edecek şekilde metal bar yerleştirilerek bir çalışma yapılmıştır. Daha sonra, iki mikrpşerit arasına yerleştirilmiş şerite, dik (dielektrik içerisine konmuş) silindirik yapılı metalik korumanın etkisi incelenmiştir.Önerilen şerit uzunluğu ve bağıl permitivite için FEXT değerinde 7dB’lik azalma görülmüştür. İkinci çalışmada, önceki tasarıma ek olarak şerit düzleminde metal dikdörtgen (RGV) eklenmiş ve FEXT değerinde 7dB’lik, dikdörtgen yerine çapraz şeritler kullanıldığı zaman ise 8dB’lik azalma tespit edilmiştir. Bu değerlendirme, şeritler arası mesafenin, şerit genişliğinin üç katı olduğu durumla karşılaştırılmıştır.
Ayrıca, mikroşerit iletim hatlarındaki dik açılı kıvrık ve merdiven türü genişleyen kesintilerden kaynaklanan empedans uyum sorunları,iki tür mikroşerit kesinti (chamfered) yöntemi ile azaltılmıştır; açı kesit ve konik kesit. Kesinti problemini azaltmak için mikroşeritin her iki yanına konik yöntemi ile empedans uyumlaması yapılmıştır. Simülasyon sonuçlarına göre, merdiven türü genişlemeli iletim hatlarına uygulanan kesintili uygumlaştırma yönteminin kesintisize göre 23GHz’(7-30) GHz lik BW için, yansıma katsayısı bakımından daha iyi olduğu görülmüştür. Kıvrık kesintili şeritlerde ise 70GHz BW için yansıma katsayısının 70%’lik oyuk oranıda, 50%’ye gore 4dB’lik bir iyileşme tesbit edilmiştir. Anahtar Kelimeler: çabraz girişim, FEXT, NEXT, kesintili mikroşerit, FEKO, RVG, CVG kesit, konik, metalik koruma yolu (via fence).
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Electronic Communications - Engineering
Antennas (Electronics)
Coupling, FEXT, NEXT, Microstrip Discontinuity, FEKO, RVG, CVG, Chamfer, Taper, Via Fence
Analysis of cross-talk and discontinuity problems in microstrip lines
Thesis
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oai:i-rep.emu.edu.tr:11129/13312014-09-17T23:00:55Zhdl_11129_3
EMU I-REP
author
Izadpanahi, Sara
2014-09-17T11:41:55Z
2014-09-17T11:41:55Z
2013-09
Izadpanahi, Sara. (2013). Motion block based video super resolution. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1331
Doctor of Philosophy in Electrical and Electronic Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Assoc. Prof. Dr. Hasan Demirel.
ABSTRACT: A multi-frame super resolution process can be used for enhancing the resolution of video frames by employing the information of consecutive low-resolution frames taken from almost the same scene. Most of these super resolution algorithms are only suitable for global motion model. Nevertheless, if a local motion pattern such as movements of some objects happens between the low resolution frames a global motion model cannot provide efficient performance. Considering this problem, we propose a novel super resolution framework, where the moving and static regions in video frames are processed separately. Occlusion is another issue, which is not considered in most of the video super resolution processes. This problem occurs when a new object appears or an object disappears in the video frames. The proposed motion-block based super resolution method not only offers a local motion model but also deals with the occluded areas in a proper way. This thesis presents a new video super resolution technique, based on the motion and static areas of the low resolution video frames. In order to separate the motion and static blocks, a block motion estimation method is employed between a reference and its neighbouring frames. Among the motion blocks, the occluded blocks are identified using an adaptive threshold applied on each block individually. Structure-adaptive normalized convolution (SANC) reconstruction method is used to generate the high resolution static and motion blocks where discrete wavelet transform (DWT) based interpolation is used to produce the high resolution occluded blocks. The static and motion blocks are combined into a high resolution frame. Finally, a sharpening process is performed on the high resolution frame in order to generate the super resolved high resolution output frame. The experimental results show that the proposed technique generates significantly better qualitative visual results as well as higher quantitative PSNR and SSIM than the state of the art video super resolution algorithms.
Keywords: Super resolution, resolution enhancement, multi-frame super resolution, video super resolution, motion estimation, local motion patterns.
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ÖZ: Çok çerçeveli süper çözünürlük işlemi video dizilerinin çözünürlüğünü hemen hemen aynı ayardaki düşük çözünürlüklü görüntülerden yararlanarak iyileştirmekte kullanılabilir. Çoğu süper çözünürlük algoritmaları sadece evrensel haraket modeli için uygundur. Yine de, eğer yerel hareket şablonunda bazı nesnelerin düşük çözünürlüklü çerçevelerde sedece yerel hareketleri olursa evrensel haraket modeli yeterli bir performans ortaya çıkarmaz. Bu problemi dikkate alarak, görüntü dizilerindeki haraketli ve sabit bölgelerin ayrı ayrı işlendiği yeni bir çözünürlük çerçeve modelini önermekteyiz. Kapanma çoğu süper görüntü çözünürlük işlemlerinde dikkate alınmayan başka bir problemdir. Bu problem görüntü dizilerinde yeni bir nesne oluşunca yada yok olunca oluşur. Önerilen blok tabanlı süper çözünürlük yöntemi sadece yerel hareket modeliyle değil kapanan alanlarla da uyumlu bir şekilde çalışmaktadır.
Bu çalışmada düşük çözünürlüklü görüntü dizinlerinin haraketli ve sabit alanlarından oluşan yeni bir süper görüntü çözünürük tekniği sunulmaktadır. Haraketli ve sabit blokları ayırmak için, referans noktası ile komşu dizinler arasında hareketli blok kestirimi yöntemi kullanılmaktadır. Haraketli blokların arasındaki kapanmış bloklar, her blok için uygun eşik değerleri kullanılarak belirlenir.Yapısal-uyarlanır düzgeleme konvolüsyon (SANC) geriçatım yöntemi yüksek çözünürlükte hareketli ve sabit bloklar üretmek için kullanılırken, interpolasyon tabanlı ayrık dalgacık dönüşümü (DWT) yüksek çözünürlüklü kapalı blok üretmek için kullanılmaktadır. Sabit ve hareketli bloklar birleştirilerek yüksek çözünürlüklü çerçeveler oluşturulmaktadır. Son olarak da bir bileme işlemi yüksek çözünürlüklü çerçeve üzerinde süper yüksek çözünürlüklü çıktı çerçevesini yaratmak için uygulanmaktadır. Deneysel sonuçlar önerilen yöntemin literatürde yer alan video süper çözünürlük algoritmalarına göre görsel görüntü kalitesi ve sayısal göstergeler ,PSNR ve SSIM gibi metrikler, aracılığı ile daha başarılı olduğunu ortaya koymaktadır.
Anahtar Kelimeler: Süper çözünürlük, çözünürlük iyileştirme, çoklu-çerçeve süper çözünürlük, video süper çözünürlük, hareket kestirimi, yerel hareket örüntüleri.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Image processing - Digital techniques
Video processing
Super resolution
Super Resolution, Resolution Enhancement, Multi-Frame Super Resolution, Video Super Resolution, Motion Estimation, Local Motion Patterns
Motion block based video super resolution
Thesis
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oai:i-rep.emu.edu.tr:11129/13442014-09-19T23:00:44Zhdl_11129_3
EMU I-REP
author
Bahmani, Keivan
2014-09-19T11:43:49Z
2014-09-19T11:43:49Z
2013-06
Bahmani, Keivan. (2013). Priority aware frame packing for OFDMA systems in distributed permutation mode. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1344
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT: As of today the two candidates for 4G which has been commercially deployed are the Institute of Electrical and Electronics Engineers (IEEE) standard 802.16e (“Mobile WiMaX”) and the 3rd Generation Partnership Project (3GPP) standard Long Term Evolution (LTE-Advanced). Both standards make use of Orthogonal Frequency Division Multiple Access (OFDMA) as their downlink modulation schemes and allocations for users must be carried out using both time and frequency (sub-channels vs. symbols). In this thesis we focus on the IEEE 802.16e in Partially Used Sub-Carrier (PUSC) mode which is taking advantage of frequency diversity. For each 5 milliseconds frame, the data for different users must be placed into the DL part of the frame based on the decision of a scheduler. Once the scheduling is complete a packing algorithm will then try to fit all requests into the frame considering channel quality, selecting Modulation and Coding Scheme (MCS) and deciding on the number of bytes per slot per burst.
The empirical channel model adopted in the thesis is the COST 231 extended version of the Hata model using 2360-2370 MHz band. All simulations were done using the MATLAB platform and writing dedicated functions for each task. We consider an urban microcell environment and assume that based on the traffic characteristics the admission control module has admitted 20 connections. The cell coverage area was assumed to be circular with a diameter of 4 km. The starting values of the radial distance (in meters) of the mobile stations in the cell were determined using varieties drawn from a uniform distribution in the range 100-2000 meters. Then, for the future frames, the position of each Mobile Station (MS) was re-calculated assuming a vehicular speed chosen uniformly between 0-60 km/h either towards or away from the Base Station (BS).
First, the well-known Enhanced One Column Stripping with Non-Increasing Area First Mapping (eOCSA) algorithm was used for packing and then a novel packing algorithm making use of priority aware packing was proposed to extend the eOCSA in order to get a more efficient packing algorithm. In the priority-aware extended eOCSA algorithm each user was given a priority number between 1 and 6. When the number is 1 or 2, the user’s bursts are assumed to be “low-priority”, and when it is between 3 and 6, the bursts are considered to be “high-priority.” The priority-aware packing algorithm would first pack the bursts in the high-priority class and then would move on to the ones in the low-priority class. If a burst cannot be fitted into a frame, its priority number would be increased (by one unit) in an attempt to upgrade its class in the next frame. That way, the leftover bursts would be progressively given higher priority numbers in upcoming frames. If the priority number associated with a burst become larger than 6, the algorithm would drops that burst. To show the effectiveness of the newly proposed priority aware packing algorithm we compared the average percentage of unallocated burst in our proposed algorithm against that of eOCSA which was obtained using 6 seconds worth of simulation (1200 frames) for the 100 times the simulation was repeated.
Keywords: SOFDMA; WiMaX; PUSC; eOCSA; Priority-Aware eOCSA.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: 4G’nin ticari olarak işletime konan iki adayı Elektrik ve Elektronik Mühendisleri Enstitüsü (IEEE) standardı 802.16e (mobil WiMaX) ve 3. Nesil Ortaklık Projesi (3GPP) standardı Uzun Süreli Evrim dir (LTE-İleri Düzey). Bu standartların ikisi de aşağı bağlantı kiplemesi olarak Dikgen Frekans Bölmeli Çoklu Erişimini (OFDMA) kullanmakta ve özgüleme hem zaman hem de frekansda (alt kanallara karşı semboller) yapılmaktadır. Bu tez, frekans çeşitliliğini avantaj olarak kullanan Kısmi Kullanılmış Alt Taşıyıcı (PUSC) modundaki IEEE 802.16e üzerinde yoğunlaşmaktadır. Farklı kullanıcılara ait veriler çizelgeleyicinin kararına göre beş mili saniye aralarla olan çerçevelerin aşağı bağlantı bölümüne yerleştirilmelidir. Çizelgeleme sona erdikten sonra, bir yerleştirme algoritması kanal kalitesini göz önünde bulundurarak, Modülasyon Kodlama Düzenini (MCS) seçerek ve dilim başına düşen bayt sayısını belirleyerek bütün istekleri çerçeveye sığdırmaya çalışacaktır.
Bu tezde kullanılan ampirik kanal modeli, 2360-2370 MHz bandını kullanan Hata modelinin geliştirilmiş bir versiyonu olan COST 231’dir. Tüm benzetimler MATLAB platformunu kullanarak ve her görev için özel fonksiyonlar yazarak gerçekleştirilmiştir. Benzetimler kentsel makrohücre ortamı ve 20 kullanıcı varsayımı ile elde edilmiştir. Hücre kapsama alanının 4 km çapında ve dairesel olduğu varsayılmış ve düzgün dağılımdan elde edilen rastgele değerlerle (100-2000 metre arası bir değer alacak şekilde) hücredeki mobil istasyonların radyal mesafeleri belirlenmiştir. Daha sonra, gelecekteki çerçeveler için her Mobil İstasyonun (MS) pozisyonu taşıt hızı Baz İstasyonundan (BS) yada Baz İstasyonuna doğru saatte 0-60 km olarak tahmin edilerek yeniden hesaplanmıştır. İlk olarak, yoğunlaşma sağlamak için iyi bilinen eOCSA algoritması kullanılmış ve daha sonra de daha etkin bir yoğunlaşma sağlayacak ve önceliklerin farkında olan eOCSAin geliştirilmiş bir versiyonu önerilmiştir. Başlangıçta önceliklerin farkında olan genişletilmiş eOCSA algoritması her kullanıcıya 1 ve 6 arasında bir öncelik sayısı vermiştir. Bu sayı 1 veya 2 olduğunda kullanıcıların önceliğinin "düşük "; 3 ve 6 arasında olduğunda ise “yüksek" olduğu varsayılmıştır. Öncelik-farkındalığı olan algoritma ilk olarak yüksek öncelikli patlamaları yoğunlaştırmaya başlamakta ve daha sonra düşük öncelikleri olanlara geçmektedir. Bir patlamanın çerçeveye yerleştirilememsi durumunda bir sonraki çerçevede sınıfının yükseltilmesi amacı ile bu patlamaların öncelik sayısı bir birim artırılmıştır. Bu sayede, artık patlamalara bir sonraki çerçeveler için kademeli olarak daha yüksek öncelik numaraları verilmektedir. Bir patlama için verilen öncelik sayısı 6’yı aştığında ise bu patlama düşürülmektedir. Yeni önerilen ve öncelik farkındalığı olan algoritmanın etkinliğini göstermek amaçlı 100 kez tekrarlanan 6 saniyelik (1200 çerçeve) benzetimler gerçekleştirilmiş ve elde edilen sonuçlar ve eOCSA için patlamaları yoğunlaştıramama avaraj yüzdelik değerleri karşılaştırılmıştır.
Anahtar kelimeler: SOFDMA; WiMaX; PUSC; eOCSA; Priority-Aware eOCSA.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Orthogonal Frequency Division multiple Access (OFDMA)
Broadband communication systems
Mobile communication systems
SOFDMA, WiMaX, PUSC, eOCSA, Priority-Aware eOCSA
Priority aware frame packing for OFDMA systems in distributed permutation mode
Thesis
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oai:i-rep.emu.edu.tr:11129/13842014-10-02T23:00:44Zhdl_11129_3
EMU I-REP
author
Jofreh, Amirhossein
2014-10-02T11:55:07Z
2014-10-02T11:55:07Z
2013-08
Jofreh, Amirhossein. (2013). . Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1384
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Runyi Yu.
ABSTRACT: Orthogonal matching pursuit (OMP) is one of the most effective techniques to
recover a sparse signal from limited number of measurements. However, when the number of measurements necessary is very large recovering the sparse signal would a challenge for CPU. In this thesis we aim to improve the performance of large array reconstruction by using parallel computing technology. We use Open Computing Language (OpenCL) in implementing parallel OMP in CPU and GPU. We also make some modification in pseudoinverse algorithm (i.e. using QR decomposition instead of naive matrix inverse) to improve the robustness of the implementation. To examine the performance and quality of implementation, we consider signals of four different sizes (i.e. small, medium, large and massive) and evaluate the results. We can obtain better performance (over 2 times faster) for signals of large and massive sizes in terms of the speed and accuracy of the reconstruction. Thanks to portability of OpenCL, the proposed implementation can be run on all kind of devices such as embedded devices, smart phones, and laptops. Keywords: Compressive Sensing, Orthogonal Matching Pursuit, OpenCL, Graphic
Processing Unit, Central Processing Unit.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Dik Eşleştirme Takib tekniği, sınırlı sayıda ölçümlerden bir seyrek sinyal kurtarmak
için en cazip tekniklerinden biridir. Ancak, bu sınırlı sayıda ölçümlerin pek çok olduğu zaman, orijinal sinyal kurtarma işi CPU için çok zor olacaktır. Bu tezde önerilen yöntem, CPU tarafından kurtarılması zor olan büyük sayıda olan ölçümler için iyidir. Bu tezde, Heterojen bilgisayar teknolojisini kullanarak, büyük miktarda olan ölçümlerin hızlıca hesaplanması için yeni bir yöntem öneriyoruz. Bu son teknolojinin gücünü kullanmak için, bize ölçümleri işlemekte tüm kaynakları kullanmak için OpenCL yi kullanıyoruz. Deneylere göre, işlem hızında hemen hemen üç kat iyileştirme vardır. Ayrıca bu hesaplama deneyi bize küçük bir hata ile çok net bir sonuç verebilir olduğunu gösteriyoruz. Eğer OpenCL yeni atom fonksiyonunu kullanırsak, kata yakın daha hıza ulaşmamız mümkün olacaktır. Ayrıca, en yüksek performans elde etmek için daha hızlı bir donanım kullanmak da mümkündür. Önerdiğimiz yöntem ile, gömülü cihazlar, akıllı telefonlar ve dizüstü bilgisayarlar gibi her türlü cihazları çalıştırmak için OpenCLyin taşınabilirliğinden
yalarlanabiliriz. Anahtar Kelimeler: Ortogonal Eşleştirme Takip, OpenCL, Grafik İşleme Birimi,
Merkezi İşlem Birimi.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
OpenCL (Computer program language)
Parallel programming (Computer science)
Compressive Sensing, Orthogonal Matching Pursuit, OpenCL, Graphic Processing Unit, Central Processing Unit
Parallel implementation of orthogonal matching pursuit in OpenCL
Thesis
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oai:i-rep.emu.edu.tr:11129/14162014-10-16T23:00:41Zhdl_11129_3
EMU I-REP
author
Yassen, Ahmad Hani
2014-10-16T12:03:36Z
2014-10-16T12:03:36Z
2014-03
Yassen, Ahmad Hani. (2014). Fixed switching frequency sliding mode control for single phase unipolar inverters. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1416
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: For the application of UPS inverters. The aim of the UPS is to provide the necessary loads with a sinusoidal output voltage at low harmonic distortion. The controller has to be able to handle any external disturbances may occur, and should have a fast response at low steady state error. For that purpose; the sliding mode controller is applied to the UPS system here. Sliding mode controller has the advantage of robustness to parameter variations and disturbances, but still suffers from chattering problem when the state of the error approaches the equilibrium point. In this thesis, the control input has been saturated in narrow boundary, aiming to reduce the chattering problem. Pulse width modulation is used to compare the smoothed control function with a reference carrier resulting a fixed switching frequency for the unipolar UPS inverter.
The output voltage of the inverter has low total harmonic distortion according to IEC62040-3 standard. The proposed controller is fast and robust as the simulations show.
Keywords: Pulse width modulation, voltage source inverter, sliding mode control.
…………………………………………………………………………………………………………………………
ÖZ: Kesintisiz güç kaynakları hassas yükleri düşük harmonik bozunumlu sinüzoidal gerilim ile beslemek için kullanılır. Bir KGK’nın denetleyicisinin dış bozanetkenlerle başedebilmesi ve düşük durağan durum hatası ile hızlı tepkimeye sahip olması gerekir. Bu amaçla KGK’ya kayan kipli denetim uygulanmıştır. Kayan kipli denetim, bozanetkenlere ve parametre değişimlerine karşı dayanıklı olmasına rağmen, durum değişkenlerinin hatası denge noktasına yaklaşırken oluşan yüksek frekanslı salınım sorununa sahiptir. Bu tezde anahtarlamalı denetleyici çıkışı dar bir bölgede girişin doğrusal işlevidir. Bunun amacı yüksek frekanslı salınımların önüne geçmektir. Düzgün hale getirilmiş denetleyici çıkışını taşıyıcı işaret ile karşılaştırmak suretiyle darbe genişlik kiplemesi kullanılmıştır. Bu şekilde KGK evirgeçini sabit anahtarlama frekansı ile çalıştırmak mümkün olmuştur.
Evirgeç çıkış gerilimi IEC62040-3 standardına uygun olarak düşük harmonik bozunuma sahiptir. Benzetim sonuçları, önerilen denetleyicinin hızlı ve dayanıklı olduğu gözlenmiştir.
Anahtar kelimeler: Darbe genişlik kiplemesi, gerilim kaynaklı evirgeç, kayan kipli denetim.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Control Devices - Inverters
Inverters - Electronic Circuits
Pulse Width Modulation, Voltage Source Inverter, Sliding Mode Control
Fixed switching frequency sliding mode control for single phase unipolar inverters
Thesis
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oai:i-rep.emu.edu.tr:11129/14302016-02-03T07:42:50Zhdl_11129_3
EMU I-REP
author
Aşık, Hüseyin
2014-10-27T09:23:18Z
2014-10-27T09:23:18Z
2013-12
Aşık, Hüseyin. (2013). A Design. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1430
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Co-Supervisor: Prof. Dr. Hasan Amca and Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: Some research results published in the literature claim that human‟s exposure to Electro-Magnetic-Fields (EMF) increases the risk of brain cancer while other research results deny this. Studying all the data available to date, the expert group working for World Health Organization (WHO), in Lyon, France came to a conclusion which classifies Radio-Frequency Electro-Magnetic-Fields (RF-EMF) as possibly carcinogenic to humans and they put RF-EMF in Group 2B. In conjunction with this, the International Commission on Non-Ionizing Radiation Protection (ICNIRP) reconsidered RF exposure limits, which should not be exceeded for human health. Whereas previous research have often focused on the result of EMF exposure and measures of EMF exposure limits, the work presented here targets methods for decreasing Global System for Mobile Communications (GSM) Base Station (BS) and Mobile Station (MS) related health concerns with reference to the numbers, transmission powers and location of the BSs in the initial design stage. The goal of this thesis is therefore, to develop methods of reducing BS and MS related health concern while maintaining functionality and keeping additional investment expenditure as low as possible for the service providers. The proposed work also provides a review of relationship between EMF exposure due to GSM phones and BSs with cancer risks. The results suggest that, the number of BSs should be increased and the transmit powers and hand-off cut-off levels adjusted such that both BS and MS transmit at minimum possible levels for maintaining a reliable communication link in order to minimize health concerns and improve service quality without compromising the functionality and operational economy. Hence, considering the population, terrain and coverage area and employing the Hata Signal Attenuation Model, a reasonable solution for the Famagusta city is estimated to use 16 Watt BSs and enable full coverage of the targeted geographic area.
Keywords: Electro-Magnetic-Fields, Radio Frequency, Base Station, Mobile Telephone.
…………………………………………………………………………………………………………………………
ÖZ: Bu araştırma, Baz İstasyonlarından (Bİ) ve özelde Cep Telefonları (CT) genelde de Mobil İletişim Cihazlarından (MİC) yayılan Elektromanyetik Alanların (EMA) kanser ile ilişkisinin, yapılan en son çalışmalara atfen incelenmesi ve olası olumsuz etkilerin daha da azaltılması konusunda yapılacak önerilerden oluşturmaktadır. Yapılan birçok ciddi çalışma birbirleri ile çelişmesine rağmen, Dünya Sağlık Örgütü (DSÖ) EMA‟nın insan sağlığı açısından “bir ihtimal kanserojendir” ibaresini kullanarak kanser açısından 2B gurubuna dahil etmiştir.
Uluslararası İyonlaştırıcı Olmayan Radyasyondan Koruma Komitesi (ICNIRP), EMA‟ların insan sağlığını etkilediği sınırları yayınlanmıştır. Fakat Bİ ve CT‟den kaynaklanan EMA‟ların bu sınırlarla olan ilişkisi hala tartışılmaktadır. Burada esas olarak Bİ‟nın ve CT‟larının mümkün olan en düşük güç seviyesinde çalışabilmesi için Bİ‟larının yerleşim düzeninin önemi üzerinde durulmuştur. Yerleşim düzeni tasarımı yapılırken halkın sağlıkla ilgili endişeleri ve servis sağlayıcıların ekonomi ve fonksiyon açısından hassasiyetleri de dikkate alınmıştır. Bu doğrultuda, Hata Sinyal Kaybı Modeli‟ne göre, Gazimağusa‟nın yüz ölçümü ve nüfusu ele alındığı zaman 16 Watt kaynak gücüne sahip Baz İstasyonunun en uygun tasarım olacağı sonucuna varılmıştır.
Anahtar kelimeler: Elektromanyetik Alan, Baz İstasyonlarından, Cep Telefonu.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Mobile communication systems
Cell phone systems
Electro-Magnetic-Fields, Radio Frequency, Base Station, Mobile Telephone
Economically and functionally sound cellular mobile communications system design consideration for minimizing health concerns
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1430/3/AsikHuseyin.pdf.txt
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oai:i-rep.emu.edu.tr:11129/14322014-10-29T00:00:42Zhdl_11129_3
EMU I-REP
author
Farhadifard, Fahimeh
2014-10-28T13:08:39Z
2014-10-28T13:08:39Z
2013-12
Farhadifard, Fahimeh. (2013). Single image super resolution based on sparse representation via structurally directional dictionaries. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1432
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Hüseyin Özkaramanlı.
ABSTRACT: In this thesis, we propose an algorithm of sparse representation using structurally directional dictionaries to super resolve a single low resolution input image. We have focused on the designing structured dictionaries for different clusters of patches instead of a global dictionary for all the patches. Due to highly directional nature of image content, designing structurally directional dictionaries promises to better capture the intrinsic image characteristics. Furthermore, designing multiple dictionaries with smaller sizes leads to less computational complexity. The proposed algorithm is based on dictionary learning in the spatial domain. In order to design dictionaries the K-SVD algorithm is used and for this purpose for each of the structured dictionaries a structured training set is prepared. In order to classify the patches into different data sets, a set of templates are designed and each patch is clustered using template matching. Each and every of the templates is modeled according to a specific direction. Then using a similarity measurement, the HR patches and the corresponding features (LR patches) are clustered into directional clusters. Then structurally directional dictionaries are learned by employing the structured training clusters via the K-SVD algorithm. For every cluster two dictionaries are designed: one for the HR patches and the other one for the features. In the reconstruction part, a LR input image comes in and all the features are coded sparsely with the most suitable directional LR dictionary; and the sparse coding coefficients are then used together with the corresponding HR dictionary to reconstruct the HR patch. In order to choose the best dictionary in sense of direction, a dictionary selection model is needed. Many approaches are tried to find the best dictionary selection method which are mostly error based. But it is not an easy issue while the LR patches (features) are the main criteria to select the most appropriate HR dictionary; it does not always yield to correct selection. However the core idea of the proposed method, designing structurally directional dictionaries, is demonstrated to have superior results compared to the state-of-the-art algorithm proposed by R. Zeyde et.al [23], both visually and quantitatively with an average of 0.2 dB improvements in PSNR over Kodak set and some bench mark images.
Keywords: super resolution, sparse representation, structurally directional dictionary.
…………………………………………………………………………………………………………………………
ÖZ: Bu tez çalışmasında, düşük çözünürlüklü tek bir giriş görüntüsü mükemmel bir şeklilde dönüştürülmek üzere yapısal yönlü sözlükler kullanılarak bir seyrek tasarım algoritması tasarlanmıştır. Çalışmada, tüm parçalar için global bir sözlük yerine, farklı parça kümeleri için yapılandırılmış sözlüklerin tasarlanması üzerinde yoğunlaşılmıştır. Görüntü içeriğinin çok yönlü yapısı nedeniyle yapısal yönlü sözlüklerin tasarımı gerçek görüntü karakteristiklerinin daha iyi bir şekilde ele alınmasını sağlamaktadır. Ayrıca çok daha küçük boyutlara sahip çoklu sözlüklerin tasarımı daha düşük hesaplama karmaşıklığına yol açmaktadır.
Tasarlanan algoritma, uzaysal alanda sözlük öğrenimine dayanmaktadır. Sözlüklerin tasarlanması amacıyla K-SVD algoritması kullanılmış olup bu amaç ile her bir yapılandırılmış sözlük için yapılandırılmış bir çalışma seti hazırlanmıştır. Parçaların farklı veri grupları arasında sınıflandırılması amacıyla bir şablon seti tasarlanmış olup şablon eşleştirmesi kullanılarak her bir parça toparlanmıştır. Şablonların her biri belirli bir yön dikkate alınarak modellenmiştir. Daha sonra bir benzerlik ölçümü yardımıyla, yüksek çözünürlüklü parçalar ve bunlara karşılık gelen özellikler (düşük çözünürlüklü parçalar) yönlü kümelerde toplanmıştır. Daha sonra ise yapısal yönlü sözlükler K-SVD algoritması üzerinden yapılandırılmış çalışma kümelerinden yararlanılarak öğrenilmiştir. Her bir küme için, biri yüksek çözünürlüklü parçalar için ve diğeri özellikler için olmak üzere iki sözlük tasarlanmıştır.
Yeniden yapılandırma kısmında, düşük çözünürlüklü bir giriş görüntüsü giriş yapıp tüm özellikler en uygun yönlü düşük çözünürlüklü sözlük yardımıyla seyrek bir şekilde kodlanmakta ve daha sonra ise, yüksek çözünürlüklü parçanın yeniden yapılandırılması amacıyla, ilgili yüksek çözünürlüklü sözlük ile seyrek kodlama katsayıları birlikte kullanılmaktadır. Yön açısından en iyi sözlüğün seçilmesi amacıyla bir sözlük seçim modeline gereksinim duyulmaktadır. En iyi sözlük seçim yönteminin bulunması amacıyla çoğunlukla hata bazlı olan birçok yöntem denenmiştir. Ancak bu kolay bir konu olmayıp düşük çözünürlüklü parçalar (özellikler) en uyugn yüksek çözünürlüklü sözlüğün temel seçim kriteri olduğu sürece her zaman doğru seçim ile sonuçlanmamaktadır. Ancak yine de tanıtılan yöntemin temel fikri olan yapısal yönlü sözlüklerin tasarımının, model seçiminin her zaman en uygun sözlüğü seçmesi halinde, Kodak seti ve bazı kriter görüntüler üzerinden PSNR’da ortalama 0.2 dB iyileştirme ile hem görsel hem de nicel olmak üzere iki açıdan R. Zeyde et.al [23], tarafından öne sürülen benzer algortimaya üstünlük sağladığı gösterilmiştir.
Anahtar Kelimeler: süper çözünürlük, seyrek gösterim, yapısal yönlü sözlük.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Image processing - Digital techniques
image recovery
Super Resolution, Sparse Representation, Structurally Directional Dictionary
Single image super resolution based on sparse representation via structurally directional dictionaries
Thesis
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oai:i-rep.emu.edu.tr:11129/14332014-10-29T00:00:45Zhdl_11129_3
EMU I-REP
author
Dorreh, Nasrin
2014-10-28T13:21:17Z
2014-10-28T13:21:17Z
2014-01
Dorreh, Nasrin. (2014). Shifted linear interpolation for images. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1433
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Prof. Dr. Runyi Yu.
ABSTRACT: In this work we study the shifted linear interpolation (SLI) method and apply this method in wavelet domain in addition to the spatial domain. The SLI is computationally cheaper than the cubic interpolation and a little more computationally complicated than the standard linear in this way: the computed optimal shift for the SLI is used to change coefficients amplitude and location of the standard linear interpolation. In the spatial domain we achieve a noticeable improvement over the standard linear interpolation in cost of some simple computations. We compare the SLI with other interpolation methods in practical test to ensure its superiority over others. We then evaluate the SLI in wavelet domain, so we carry out our experimental tests in this domain. The SLI method is originated from the principle attempt to minimizing the least square error which is much in the case of the standard linear interpolation. We Evaluate the SLI with experimental results such as rotation and magnification in spatial and wavelet domain. In rotation experiment, we use the SNR and SSIM to evaluate the standard linear, the SLI, and the cubic methods and this comparison is carried out in spatial domain. A second practical experiment is magnification which is done in spatial as well as wavelet domain and the comparison between the nearest, the standard linear, the SLI and the cubic is hold by visual and objective evaluation.
Keywords: Linear interpolation, Shifted linear interpolation, Super resolution, Spline functions, Discrete wavelet transform.
…………………………………………………………………………………………………………………………
ÖZ: Bu tez çalışmasında kaydırılmış bir çizgisel enterpolasyon (KÇE) yöntemi üzerinde çalışılmış olup yöntem zaman alanına ek olarak dalgacık alanında da dikkate alınmıştır. Çalışma sonucunda basit hesaplama maliyeti ile standart çizgisel enterpolasyon ile doğru orantılı olarak dikkate alınabilecek bir gelişme sağlanmıştır. Diğer yöntemlere üstünlüğü tespit edilmek üzere, KÇE, diğer enterpolasyon yöntemleri ile deneysel olarak karşılaştırılmıştır. Son olarak KÇE’nin dalgacık alanında değerlendirilmesi kararlaştırılmış olup bu neden ile deneysel testler bu alanda gerçekleştirilmiştir. KÇE yönteminin kökeni, daha çok standart çizgisel enterpolasyon konusundaki en düşük kare hatasının en düşük düzeye indirgenmesi yönündeki temel girişimlere dayanmaktadır. KÇE hesaplama açısından kübik enterpolasyondan daha ucuz olup hesaplama karmaşıklığı standart çizgisel enterpolasyondan açıklanan şekilde biraz daha fazladır : KÇE için hesaplanan optimum kayma, standart çizgisel enterpolasyonun katsayı değeri ve konumunun değiştirilmesi için kullanılmış olup daha sonra ise standart çizgisel enterpolasyon yöntemi uygulanmıştır. KÇE yöntemi, zaman ve dalgacık alanlarında rotasyon ve büyütme gibi deneysel sonuçlar ile analiz edilmiştir. Rotasyon deneyinde, standart çizgisel, KÇE ve kübik yöntemlerinin değerlendirilmesi için SNR ve SSIM kullanılmış olup bu karşılaştırma zaman alanında gerçekleştirilmiştir. İkinci deneysel bir test ise büyütme deneyi olup hem zaman hem de dalgacık alanlarında gerçekleştirilmiş olup en yakın, standart çizgisel, KÇE ve kübik yöntemleri arasındaki karşılaştırma görsel değerlendirme yolu ile geçekleştirilmiştir.
Anahtar Kelimeler: parçalı çizgisel polinomlar, enterpolasyon, hata analizleri, yaklaşma yöntemleri, şerit fonksiyonları, ayrık dalgacık dönüştürme.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Image processing - Digital techniques
Linear Interpolation, Shifted Linear Interpolation, Super Resolution, Spline Functions, Discrete Wavelet Transform
Shifted linear interpolation for images
Thesis
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oai:i-rep.emu.edu.tr:11129/14382014-10-31T00:00:40Zhdl_11129_3
EMU I-REP
author
Zedan, Derar Ahmad Abdalatef
2014-10-30T07:34:05Z
2014-10-30T07:34:05Z
2014-03
Zedan, Derar Ahmad Abdalatef. (2014). Predictive current control strategy for single phase grid connected inverter. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1438
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: In this thesis, the predictive current control method is employed to control the single phase grid connected inverter under the condition of known grid voltage and load current. In real implementation the controller needs a certain time to do the required digital sampling and computations before the control command proceed to the inverter switches. Traditional predictive current control use the previous switching interval values in order to predict the required average inverter output voltage to follow the reference current. Nowadays, the availability of fast and low cost digital signal processer boards (DSP's) makes the implementation of predictive controllers simpler and more sufficient, based on above an improved predictive current control algorithm is developed such that the inverter work with high performance.
An improved predictive current control algorithm is developed by setting the sampling point just ahead the controlling point by the period of total sampling and computation delay, this adjustment make the control approach more robust against the system parameter variation. Moreover, the grid voltage prediction using the linear sine wave prediction instead of the traditional linear extrapolation prediction is sufficient to give more enhancements to the injected power in the utility grid.
Keywords: predictive current control, single phase grid connected inverters, discrete time control, renewable energy.
…………………………………………………………………………………………………………………………
ÖZ: Bu tezde, şebekeye bağlanmış tek faz bir evirgeçin, şebeke geriliminin bilinmesi durumu için, öngörücü akım denetim yöntemi kullanılmıştır. Gerçek uygulamada, denetim komutunun evirgeç anahtarlarına uygulanmasından önce, gerekli sayısal örnekleme ve hesaplamaların yapılabilmesi için denetleyicinin belli bir zamana gereksinimi vardır. Geleneksel öngörücü akım denetimi, referans akımının takip edilebilmesi için gerekli olan evirgeç ortalama çıkış gerilimini hesaplamak için bir önceki örnekleme aralığına ait değerleri kullanır. Günümüzde, hızlı ve düşük maliyetli sayısal işaret işlemcilerinin bulunabilirliği, öngörücü denetleyicilerin uygulanmasını basitleştirmiştir. Buna dayanarak, evirgeçin yüksek başarımlı çalışması için iyileştirilmiş bir öngörücü akım denetleyicisi geliştirilmiştir.
Bu denetleyicide örnekleme anı, toplam örnekleme ve hesaplama gecikmesine eşit bir zaman aralığı farkı ile denetleme anından önceye alınmaktadır. Bu ayarlama ile denetim yaklaşımı sistemin parametre değişimleri karşısında daha dayanıklı hale gelmesine yol açmıştır. Buna ek olarak, şebeke geriliminin öngörülmesi için, geleneksel doğrusal dışdeğerleme yerine sinüs dalga doğrusal öngörü kullanılarak şebekeye verilen gücün daha verimli olması sağlanmıştır.
Anahtar Kelimeler: Öngörücü akım denetimi, tek faz şebekeye bağlı evirgeç, kesik zamanlı denetim, yenilenebilir enerji.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Electric Power Systems
Renewable energy sources
Predictive Current Control, Single Phase Grid Connected Inverters, Discrete Time Control, Renewable Energy
Predictive current control strategy for single phase grid connected inverter
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/14422014-10-31T00:00:48Zhdl_11129_3
EMU I-REP
author
Rouhafzay, Ghazal
2014-10-30T09:07:24Z
2014-10-30T09:07:24Z
2014-02
Rouhafzay, Ghazal. (2014). Improving the efficiency of OBBP allocation algorithm. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1442
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT: Mobile WiMAX based on IEEE 802.16e is a broad band wireless access technology which has been widely accepted as the best solution for wireless broad band services. This technology is implemented by Orthogonal Frequency Division Multiple Access (OFDMA) that breaks down the spectrum into narrower bands with smaller number of subcarriers. In this thesis a comprehensive study of WiMAX system was carried out. We mainly focus on downlink transmission scenario where users assigned by the scheduler should be placed in DL subframe. Different frame packing algorithms are implemented and the work also introduces a new strategy to improve the packing efficiency of the standard Orientation Based Burst Packing (OBBP) algorithm. The aim while packing is to maximize the utilization of the DL subframe space and also at the same time to minimize the wasted slots. Enhanced One Column Striping with non-increasing Area first mapping (eOCSA) and the OBBP algorithms were first implemented using the MATLAB platform and by introducing a new strategy in the 3rd stage of the OBBP frame packing algorithm a substantial improvement in frame utilization and hence efficiency has been obtained. To start with the efficiency of the modified OBBP (MOBBP) and standard OBBP algorithms were obtained through simulations where a subframe with a capacity of 840 slots (60 subchannels × 28 symbols) was assumed and the instantaneous offered load was varied in the range 0.8 to 3.2. For this set up it was observed that for all offered loads MOBBP had higher efficiencies in comparison to OBBP. The efficiency gain varied between 1-3 % and was most distinct when the load was around 1 %. In a second experiment, the (eOCSA), OBBP and MOBBP algorithms were compared assuming a subframe with 360 slot capacity (30 subchannels × 12 symbols). For this experiment till the instantaneous load reached 1.5 % the MOBBP would have a 4-5 % improvement in efficiency over OBBP. When the offered load exceeded 1.5 % the gain in efficiency would gradually drop. Comparing eOCSA with OBBP and MOBBP clearly shows that efficiency for eOCSA is consistently better than both over all offered loads. The difference between MOBBP and eOCSA is around 2-2.5 % after the offered load exceeds 2 %. The thesis also provides the mean over allocated slots per frame for the three algorithms compared. By far the eOCSA has the highest over allocated slots among the three compared algorithms. A third experiment was conducted to compare the OBBP and MOBBP under real traffic using the COST-231 Hata Extended channel model. The distance of each user from the base station and speed of user’s have been selected from a uniform distribution. We have varied the number of users between 20 and 40. Packing efficiency and number of padded slots in the two algorithms have been compared. For the (30 × 24) DL subframe the results show
that MOBBP is again consistently better than the standard OBBP. It was observed that the gain in the frame packing efficiency would change up to 1.2 %. Keywords: eOCSA; OBBP; MOBBP; OFDMA; DL-PUSC; WiMAX.
…………………………………………………………………………………………………………………………
ÖZ: IEEE 802.16 standartlarına bağlı bir geniş bant erişim teknolojisi olan WiMAX kablosuz servis sunabilen diğer teknolojiler arasında en iyi çözüm olarak ortaya çıkmaktadır. Bu teknolojinin temelinde dikgen frekans bölüşümlü Çoklu Erişim (OFDMA) yöntemi bulunmaktadır ki bu yöntem frekans bandını katlı ara-taşıyıcılara paylaştırmaktadır. Bu tezde WiMAX sistemi ve içerdiği alt bloklar kapsamlı bir şekilde çalışılmıştır. Ağırlıkla aşağı bağlantı iletim senaryosu altında çizelgeleyici tarafından atanan kullanıcıların DL altçerçevesine yerleştirilmesi incelenmiştir. Çalışmada farklı çerçeve doldurma algoritmaları kıyaslanmış ve yeni bir strateji doğrultusunda standard OBBP çerçeve dolgulama algorıtmasının altçerçeve kullanım oranı ve dolayısı ile verimlilik yüzdesinin nasıl artırılabileceği gösterilmiştir. Dolgulama esnasında esas hedef DL alt çerçevesini en iyi şekilde kullanma ve ayni zamanda da dilim heba oranını en aza indirmek idi. İlk olarak MATLAB platforumu üzerinde eOCSA ve OBBP algoritmaları gerçekleştirilmiş ve standard OBBP algoritmasının 3. ayağında yeni bir strateji kullanılarak çerçeve kulanım oranı ve dolayısı ile dolgulama verimliliği önemli oranda iyileştirilmiştir. Başlangıçta, standard OBBP ve geliştirilmiş OBBP (MOBBP) algoritmalarının verimlilikleri 840 dilimli ( 60 alt kanal × 28 sembol) bir altçerçeve varsayan ve anlık yükü 0.8 ile 3.0 arasında değiştiren benzetim çalışmaları ile elde edilmiştir. Bu deneyde MOBBP nin tüm anlık yüklerde OBBP ye göre daha yüksek verimliliğe sahip olduğu ortaya çıkmıştır. Verimlilik kazancı yüzde 1-3 arasında değişmiş ve en yüksek kazanç yükün 1% oldu durumda görülmüştür. İkinci bir deneyde ise geliştirilmiş eOCSA, OBBP ve MOBBP algoritmaları 360 dilimlik (30 alt kanal × 24 sembol) kapasitesi olan bir alt-çerçeve varsayarak kıyaslanmıştır. Görülmüştür ki anlık yük yüzde 1.5’i aşana kadar MOBBP, standard OBBP ye göre 4-5 % verimlilik kazancı sağlamaktadır. Yükün daha da artırıldığı durumlarda aradaki verimlilik kazanç farkı yavaşça düşmektedir. Bütün anlık yüklerde eOCSA’in verimlilik değerleri hem OBBP hem de MOBBP ye göre daha yüksek bulunmuştur. MOBBP ve eOCSA arasındaki fark anlık yük 2 % bulduktan sonra yaklaşık yüzde 2-2.5 civarındadır. Bildiride ayrıca frame başına her algoritmanın ortalama fazladan özgüleme değerleri de farklı anlık yükler için sunulmuştur. En yüksek fazladan özgüleme yapan algoritmanın eOCSA olduğu görülmüştür. Bir üçüncü deney de ise COST-231 genişletilmiş Hata kanal modeli gerçekleştirilmiş ve OBBP ve MOBBP algoritmaları gerçek trafik altında kıyaslanmıştır. Kullanıcıların baz istasyonundan uzaklıkları ve her kullanıcının hızı düzgün dağılımlardan çekilmiştir ve sistemdeki kullanıcı sayısı 20 ile 40 arasında değiştirilmiştir. Her iki algoritmanın altçerçeve doldurma verimliliği ve kaç dilim dolguladığı incelenmiştir. ( 30 × 24 ) lük altçerçeveler için MOBBP nin OBBP ye göre devamlı daha iyi sonuç verdiği görülmüştür. Gerçek kanal ve yük altında elde edilen çerçeve
dolgulama verimlilik kazancı kadar yüzde 1.2 arasında değişmektedir.
Anahtar Kelimeler: eOCSA; OBBP; MOBBP; OFDMA; DL-PUSC; WiMAX.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Mobile communication systems
eOCSA, OBBP, MOBBP, OFDMA, DL-PUSC, WiMAX
Improving the efficiency of OBBP allocation algorithm
Thesis
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oai:i-rep.emu.edu.tr:11129/14672014-11-05T00:00:59Zhdl_11129_3
EMU I-REP
author
Allahakbari, Farshid
2014-11-04T12:26:21Z
2014-11-04T12:26:21Z
2013-08
Allahakbari, Farshid. (2013). Double-Band hysteresis current control method for three-phase shunt active power filters. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1467
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Hasan Kömürcügil.
ABSTRACT: The widespread use of nonlinear loads in all branches of industry and in the power electronic equipment has increased the harmonic current distortion on the power system which leads to poor power factor, increased heating losses, and harmful disturbance to other loads connected at the same point of common coupling (PCC). For harmonic elimination and improving the power factor, passive LC filters have conventionally been used although, they have many drawbacks. Alternatively, shunt active power filters (APFs) have been considered as a potential candidate. In recent publications, diverse control strategies have been introduced for three-phase APFs. Among the current-control strategies, the conventional single-band hysteresis current-control (SBHCC) has received much attention due to its major advantages such as higher accuracy, fast dynamic response, robustness and simplicity in implementation. Despite these advantages, the SBHCC has a major disadvantage that the switching frequency is very high which increases the switching losses. These losses can be decreased by increasing the hysteresis band, at the expense of decreasing the switching frequency. In this thesis, a double-band hysteresis current-control (DBHCC) scheme is introduced for three-phase shunt active filters. First, the mathematical modeling of the three-phase APF is developed. Then, it is implemented by using SIMULINK/MATLAB. Finally, the results are compared with that of obtained by the SBHCC method.
Keywords: Active Power Filter, Power Electronics, Hysteresis Current Control Method.
…………………………………………………………………………………………………………………………
ÖZ: Doğrusal olmayan yüklerin endüstrinin tüm dallarında ve güç elektroniği cihazlarında yaygın olarak kullanımı güç sistemlerindeki harmonik akım bozunumunu artırmıştır. Akımdaki bu bozunum ise güç faktörünün istenen değerden küçük olmasına, ısı kayıplarının artmasına ve ortak noktaya bağlı olan diğer yüklerin de olumsuz etkilenmesine neden olmaktadır. Geleneksel olarak, akımdaki istenmeyen harmoniklerin yok edilmesi ve güç faktörünün de iyileştirilmesi için pasif LC süzgeçler kullanılmıştır. Ancak, bu süzgeçlerin birçok dezavantajları bulunmaktadır. Bunlara çare olarak, paralel aktif güç süzgeçleri potansiyel bir aday olarak dikkate alınmıştır.
Yakında yapılan çalışmalarda, üç fazlı aktif süzgeçler için çeşitli kontrol yöntemleri önerilmiştir. Bu akım kontrol yöntemlerinin içinde geleneksel tek bandlı histeresiz akım kontrolü, yüksek doğruluk, hızlı dinamik cevabı, parametrelere olan dayanıklılığı ve uygulamada olan kolaylığı gibi önemli avantajlarından dolayı çok dikkat çekmiştir. Bu avantajlara rağmen, tek bandlı histeresiz akım kontrolunun önemli bir dezavantajı ise anahtarlama frekansının çok yüksek olmasıdır. Yüksek anahtarlama frekansı anahtarlama kayıplarının artmasına neden olmaktadır. Bu kayıplar, histeresiz bandını artırmak suretiyle azaltılabilir. Histeresiz bandının artırılması anahtarlama frekansının azalmasına sebebiyet verir.
Bu tezde, üç fazlı paralel aktif güç süzgeçleri için iki bandlı histeresiz akım kontrol yöntemi tanıtılmıştır. İlk olarak, üç fazlı paralel güç süzgecinin matematiksel modellenmesi yapılmıştır. Daha sonra ise, önerilen kontrol yönteminin MATLAB ortamında benzetimi yapılmıştır. Son olarak, elde edilen sonuçlar, tek bandlı histeresiz akım kontrol yönteminden elde edilen sonuçlarla karşılaştırılmıştır.
Anahtar Kelimeler: Aktif Güç Süzgeci, Güç Elektroniği, Histeresiz Akım Kontrol Yöntemi.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Electronics
Active Power Filter, Power Electronics, Hysteresis Current Control Method
Double-Band hysteresis current control method for three-phase shunt active power filters
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1467/3/AllahakbariFarshid.pdf.txt
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oai:i-rep.emu.edu.tr:11129/14712014-11-06T00:00:37Zhdl_11129_3
EMU I-REP
author
Al-Khafaji, Ahmed Samawi Ghthwan
2014-11-05T11:25:25Z
2014-11-05T11:25:25Z
2013-06
Al-Khafaji, Ahmed Samawi Ghthwan. (2013). Disturbance estimator based predictive current control of grid-connected inverters. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1471
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: The work presented in my thesis considers one of the modern discrete-time control approaches based on digital signal processing methods, that have been developed to improve the performance control of grid-connected three-phase inverters. Disturbance estimator based predictive current control of grid-connected inverters is proposed. For inverter modeling with respect to the design of current controllers, we choose the d-q synchronous reference frame to make it easier to understand and analyze. In accordance with the d-q system coordinate, we select the space vector pulse-width modulation (SVPWM) to implement the drive logic of the electronic switches, which is considered the best method used to generate the PWM control pulses because it provides a fixed switching frequency. Therefore, the distortion in the output voltage and current is to be less compared with the other PWM methods. In this thesis, we discuss the basics of grid-connected inverter modeling and analysis. In addition, all the equations have been derived in ( ) and ( ) reference frames. The simulations of predictive current control and disturbance estimator are discussed. In the simulation study, we obtain grid current waveforms in the steady-state and for step changes in the d-component of the reference current. The controlled grid current is observed to track the desired current with negligible differences. The grid angle is extracted via PLL using the estimated reactive disturbance component. Moreover, the abc dq stability of the disturbance estimator due to the parameter errors in the inductor filter is analyzed numerically regarding the estimator gains.
The advantage of this strategy comes from the fact that grid voltage sensors are not required, thus we obtain a low-cost implementation with high performance and robustness.
Keywords: Inverters, Predictive Current Control (PCC), d-q Synchronous Reference Frame, Space Vector (PWM).
…………………………………………………………………………………………………………………………
ÖZ: Bu çalışmanın amacı, şebekeye bağlı 3-faz inverterlerin başarımını iyileştirmek için son zamanlarda geliştirilen, sayısal işaret işleme tabanlı, kesikli-zaman kontrol yaklaşımlarını incelemektir.
Şebekeye bağlı inverterlerin bozanetken kestirimli öngörülü akım kontrolü için bir yöntem önerilmektedir. Akım kontrolünün daha anlaşılır ve analizinin daha kolay olması açısından d-q senkron referans çerçevesi seçilmiştir. Bu çerçeveye uygun olarak, elektronik anahtarların darbe genişliği kiplemeli (DGK) kontrol sinyallerini üretmek için uzay vektörü DGK’si seçilmiştir. Bunun bir nedeni de bu yöntemin sabit anahtarlama frekansına sahip olmasıdır. Bunun sonucunda çıkış gerilimi ve akımındaki bozunumun diğer DGK yöntemlerine göre daha az olması beklenir.
Bu tezde şebekeye bağlı inverterlerin modelleme ve analizinin temelleri tartışılmıştır. Bütün denklemler (abc) ve (dq) çerçevelerinde çıkarılmıştır. Öngörülü akım kontrolü ve bozanetken kestirimcisinin benzetimleri de tartışılmıştır. Benzetim çalışmalarında, şebeke akımının durağan durum ve referansın d-bileşenindeki akım değişimi durumlarında dalga şekilleri elde edilmiştir. Kontrol edilen akımın istenen akımı çok az farkla takip ettiği gözlenmiştir. Daha sonra, PLL uygulamak suretiyle bozanetken kestiriminin reaktif bileşenini kullanarak şebeke faz açısının elde edilmesi tartışılmıştır. Son olarak ise, bobin süzgeç ve kestirimci kazançlarındaki parametre hataları durumunda bozanetken kestiriminin kararlılığı, sayısal olarak incelenmiştir. Bu yaklaşımın bir üstünlüğü de, şebeke gerilim duyargalarına ihtiyaç duymamasıdır. Dolayısiyle yüksek başarımı olan ve çalışması istikrarlı bir sistem düşük maliyetle elde edilmektedir.
Anahtar kelimeler: Inverterler, Öngörülü Akım Kontrolü, d-q Senkron Referans Cerçeve, Uzay Vektörü DGK.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Power electronics
Predictive control
Inverters, Predictive Current Control (PCC), d-q Synchronous Reference Frame, Space Vector (PWM)
Disturbance estimator based predictive current control of grid-connected inverters
Thesis
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oai:i-rep.emu.edu.tr:11129/14752014-11-16T00:00:44Zhdl_11129_3
EMU I-REP
author
Marrogy, Ghassan A. Qas
2014-11-15T13:22:25Z
2014-11-15T13:22:25Z
2013-06
Marrogy, Ghassan A. Qas. (2013). Performance analysis of routing protocols and TCP variants under HTTP and FTP traffic in MANET's. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1475
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Assoc. Prof. Dr. Ali Hakan Ulusoy.
ABSTRACT: MANET stands for mobile ad-hoc network that has multi-hop and dynamic nature, where each station changes its location frequently and automatically configures itself. Nodes can move freely in MANET while transmitting and receiving the data traffic by using wireless radio waves. Hence, nodes mobility in MANET requires a routing mechanism to communicate with each other. Additionally MANET experiences several types of delays and losses which may not be related to congestions. Appropriate precaution has to be taken for assessing such losses and distinguishing them from congestion losses, so that TCP can be sensitive while invoking the congestion control mechanism. In this thesis, four routing protocols that are optimized link state routing (OLSR), geographic routing protocol (GRP), dynamic source routing (DSR), and ad-hoc on-demand distance vector (AODV) are discussed along with three TCP variants that are SACK, New Reno and Reno. The main focus of this thesis is to study the impact of high, medium and low traffic load on routing protocols and TCP variants. The thesis also analyzes the performances of routing protocols and TCP variants on other environmental conditions such as scalability and mobility. The results of the thesis show that the proactive protocols OLSR and GRP outperform the reactive protocols AODV and DSR with the same nodes size, nodes speed, and traffic load. On the other hand, regarding the TCP variants, the results of the research reveal the superiority of the TCP SACK variant over the other two variants in case of adapting to varying network size, while the TCP Reno variant acts more robustly in varying mobility speeds and traffic loads.
Keywords: MANET, routing protocols, TCP variants, performance evaluation, network load.
…………………………………………………………………………………………………………………………
ÖZ: Mobil tasarsız ağlar anlamına gelen MANET dinamik bir yapıya sahip olup, her istasyonun sık sık yer değiştirdiği ve otomatik olarak düzenlendiği bir yapıya sahiptir. Düğümler kablosuz radyo dalgalarıyla iletim ve alış veri trafiğini sağlarken MANET içerisinde serbestçe hareket edebilirler. Bu nedenle, düğümlerin MANET içerisindeki hareketliliğinden dolayı birbirleri ile iletişim kurabilmeleri için bir yönlendirme mekanizmasına ihtiyaç vardır. Ayrıca MANET’de tıkanıklık ile ilişkili olmayabilen birçok gecikme ve kayıp yaşanabilir. TCP’nin duyarlı bir şekilde tıkanıklık kontrol mekanizmasını sürdürebilmesi için bu kayıpların değerlendirilmesi ve tıkanıklık kayıplarından ayırt edilmesi için uygun özenin gösterilmesi gerekmektedir. Tezde en uygun bağlantı durumu yönlendirme (OLSR), coğrafi yönlendirme protokolü (GRP), dinamik kaynak yönlendirme (DSR), ve anlık talep üzerine mesafe vektörü (AODV) olarak adlandırılan yönlendirme protokolleri ile birlikte SACK, Yeni Reno ve Reno olarak adlandırılan TCP türevleri incelenmiştir. Tezin ana inceleme alanı yönlendirme protokolleri ve TCP türevleri üzerinde, yüksek, orta ve düşük trafik yükünün etkisini incelemektir. Tez ayrıca ölçeklenebilirlik ve hareketlilik gibi diğer çevresel koşullara göre yönlendirme protokollerinin ve TCP türevlerinin başarımlarını analiz etmektedir. Tezden elde edilen sonuçlar neticesinde, proaktif yönlendirme protokolleri OLSR ve GRP’nin ayni düğüm boyutu, düğüm hızı ve trafik yükü altında reaktif protokoller AODV ve DSR’den daha iyi başarımlar verdiği gösterilmiştir. Diğer yandan, TCP türevleri ile ilgili olarak yapılan araştırma sonuçları göstermiştir ki, TCP Reno türevi farklı hızlarda hareket ve trafik yükünde daha sağlıklı davranmasına rağmen, TCP SACK türevi değişik ağ boylarına uyum sağlama açısından diğer iki türevden daha iyi başarım göstermektedir.
Anahtar Kelimeler: MANET, yönlendirme protokolleri, TCP türevleri, başarımlarının değerlendirme, ağ yükü.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Computer networks
MANET, Routing Protocols, TCP Variants, Performance Evaluation, Network Load
Performance analysis of routing protocols and TCP variants under HTTP and FTP traffic in MANET's
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/15032014-11-20T00:00:47Zhdl_11129_3
EMU I-REP
author
Çetinkaya, Şadi
2014-11-19T11:26:12Z
2014-11-19T11:26:12Z
2013-05
Çetinkaya, Şadi. (2013). DFT - based high resolution frequency estimation using three samples. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1503
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: Estimation of the parameters of a complex sinusoid in noise usually consists of two steps; a coarse frequency estimation found by applying the N-point DFT of an N length input. Then a search method is applied around the peak frequency.
Different search methods can be applied around the peak frequency. In this thesis, we try to compare the method proposed by Candan with the Jacobsen, Macleod and Quinn’s estimators. The performance measure of these algorithms will be compared in terms of the Cramer-Rao lower bound. Different experiments have been implemented with different number of observations. Simulations show that as the number of observations becomes larger, these methods converge to the Cramer-Rao lower bound expressed as RMS error. However, Candan’s method has shown the best performance among all other algorithms.
Keywords:Frequency Estimation, DFT, Jacobsen Estimator, Quinn Estimator, Macleod Estimator, Cramer-Rao Lower Bound.
…………………………………………………………………………………………………………………………
ÖZ: Bir gürültülü karmaşık üstelin parametre kestirimi genellikle iki adımdan oluşur: Uzunluğu N olan bir veriye N-noktalı bir DFT uygulanmak suretiyle yaklaşık sıklık kestirimi, daha sonra ise bu sıklık etrafında bir arama yönteminin uygulanması.
Yaklaşık kestirilmiş sıklık etrafındaki arama için farklı yöntemler uygulanabilir. Bu tezde, Candan tarafından önerilmiş yöntemin, Jacobsen, Macleod ve Quinn’in kestirim yöntemleri ile karşılaştırılmasına çalışılmıştır. Bu algoritmaların karşılaştırılması için Cramer-Rao alt sınırı başarım ölçütü olarak alınmıştır.
Farklı sayıda gözlemler ile birçok deney yapılmıştır. Benzetim çalışmaları, bu yöntemlerin, gözlem sayısı arttıkça MSE’nin karekökü cinsinden ifade edilen Cramer-Rao alt sınırına yakınsadığını göstermiştir. Candan’ın yöntemi, diğer algoritmalara göre en iyi başarımı göstermiştir.
Anahtar kelimeler: Sıklık kestirimi, DFT, Jacobsen kestirimi, Quinn Kestirimi, Macleod kestirimi, Cramer-Rao alt sınırı.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Çetinkaya
Şadi
DFT - based high resolution frequency estimation using three samples
Thesis
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oai:i-rep.emu.edu.tr:11129/15162014-11-26T00:00:45Zhdl_11129_3
EMU I-REP
author
Azar, Fariba Beiramzadeh Azar
2014-11-25T09:45:35Z
2014-11-25T09:45:35Z
2013-08
Azar, Fariba Beiramzadeh. (2013). Detecting lesions in MRI brain images combining pseudo-color segmentation with fuzzy C-Means clustering. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1516
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Assoc. Prof. Dr. Hasan Demirel.
ABSTRACT: As biomedical image analysis has been improved over the last decades, the widespread advancement of detection/estimation approaches has aided the rapid development of new technologies for monitoring and diagnosis, as well as, treatment of patients. Image segmentation plays a substantial role as part of the preprocessing in various biomedical applications. The segmentation technique is widely used by the radiologists to interpret the input medical image into meaningful data to be used for the extraction of the required features for further processing. Clustering as one of the widely used image segmentation techniques, which can be used in numerous biomedical applications, such as quantification of tissue volumes, diagnosis, study of anatomical structure, and computer-integrated surgery. There is a vast variety of imaging tools such as Magnetic Resonance Imaging (MRI), Computed Tomography (CT), Positron Emission Tomography (PET) and ultra sound in which the segmentation can be utilized.
In this thesis we propose a new approach for tumor detection in magnetic resonance imaging (MRI) brain images, which is utilized by using pseudo-color based segmentation with Fuzzy C-Means clustering (FCM) method. The key idea of pseudo-colored segmentation method with FCM is to segment the given MRI image by converting the prior gray-scale image into a pseudo-colored image and then identify the tumor tissue by using proposed clustering algorithm FCM. The proposed method contains an efficient clustering scheme which can be used in MRI applications. The application of this method in tumor detection and segmentation could assist pathologist to recognize tumor size and region successfully. The results obtained by the proposed FCM based approach are very competitive and better in most cases in comparison with the K-Means clustering method, which is one of the important approaches available in the literature for the same problem. FCM based system outperforms the K-Means based system with respect to final segmentation performance evaluated by sensitivity, precision, SSIM, PSNR and segmentation accuracy metrics. The superiority of the FCM based system over the K-Means based system has been verified with the obtained results.
Keywords: Image segmentation, Clustering, K-Means, FCM, medical image processing, brain tumor detection, MRI analysis.
…………………………………………………………………………………………………………………………
ÖZ: Biyomedikal imge analizi son on yıl içinde gelişme kaydetmiş ve algılama/kestirim yaklaşımlarında yaygın ilerleme sağlayarak hasta izleme ve tanı yanı sıra, hastaların tedavisi için de yeni teknolojilerin hızla gelişmesine destek vermiştir. Görüntü bölütleme çeşitli biyomedikal uygulamalarda ön işlem süreçi olarak önemli bir rol oynamaktadır. Bölütleme tekniği yaygın olarak radyologlar tarafından medikal girdi imgelerinden anlamlı veri çıkarımı ve yorum yapabilme amacıyla kullanılmakta ve çıkarımı yapılan verilere daha sonraki süreçlerde gereksinim duyulmaktadır. Kümeleme birçok biyomedikal uygulamalarda yaygın olarak kullanılabilen bir görüntü bölütleme tekniği olarak değerlendirilebilir. Bahse konu uygulamalar arasında doku hacmi niceleme, tanı koyma, anatomik yapı değerlendirme, ve bilgisayar destekli cerrahi sayılabilir. Ayrıca, Manyetik Resonans görüntüleme (MRI), Bilgisayarlı Tomografi (CT), Pozitron Emisyon Tomografi (PET) ve ultra ses görüntüleme gibi çok çeşitli araçlarda bölütleme uygulamaları kullanılmaktadır.
Bu tezde, bulanık c-ortalama (FCM) kümeleme ile sözde-renkli bölütleme yöntemlerini kullanan manyetik rezonans görüntüleme (MRI) tabanlı beyin görüntülerinde tümör tespiti gerçekleştirebilen yeni bir yaklaşım öneriyoruz. FCM ile sözde-renkli bölümleme yöntemlerini kullanmadaki en önemli ve anahtar fikir eldeki gri-tonlu MRI girdi imgesinin sözde-renkli bir imgeye dörüştürüldükten sonra önerilen FCM kümeleme algoritması yordamı ile tümör dokusunun belirlenmesi ve bölütlenmesidir. Önerilen yöntem, MRI uygulamalarında rahatlıkla kullanılabilecek önemli bir yaklaşımdır. Bu tümör tespit ve bölütleme yönteminin uygulanması patologlara başarılı bir şekilde tümör boyutu ve bölgesinin balirlenmesinde yardımcı olabilir. Önerilen FCM dayalı bir yaklaşım ile elde edilen sonuçlar, literatürde mevcut olan önemli yaklaşımlardan biri olan K-ortalama yöntemi ile karşılaştırıldığında pek çok durumda daha rekabetçi ve başarılı sonuçlar elde edilmiştir. FCM tabanlı sistem ile K-ortalama tabanlı sistem ile sonuçta elde edilen bölütleme performasları duyarlılık, hassasiyet, SSIM, PSNR ve belütleme doğruluğu metrikleri bağlamında karşılaştırılmış ve FCM tabanlı sistemin üstünlüğü doğrulanmıştır.
Anahtar Kelimeler: Görüntü bölütleme, kümeleme, K-Araçları, FCM, tıbbi görüntü işleme, beyin tümörü tespit, MRI analizi.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Imaging systems in medicine
Artificial intelligence - Medical applications
Computer Vision
Image processing - Digital techniques
Diagnostic imaging - Digital techniques
Image Segmentation, Clustering, K-Means, FCM, Medical Image Processing, Brain Tumor Detection, MRI Analysis
Detecting lesions in MRI brain images combining pseudo-color segmentation with fuzzy C-Means clustering
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/15312014-11-26T00:01:03Zhdl_11129_3
EMU I-REP
author
Makki, Hayder Mazin
2014-11-25T15:26:42Z
2014-11-25T15:26:42Z
2013-09
Makki, Hayder Mazin. (2013). Multi - band fractal antenna modeling. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1531
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
ABSTRACT: This thesis demonstrates the design procedure of a multilayer fractal patch antenna to be used. A novel combination structure of fractal geometries arranged in two stacked layers that allows a multiband/wideband operation has been utilized for the proposed antenna. Rectangular and triangular patches are used in layer 1 and layer 2, respectively. A combination of Sierpinski Carpet Fractal (SCF) geometry and Minkowski Fractal (MKF) geometry is used as layer 1; Layer 2 composed of the combination of Koch Snowflake Fractal (KSF) with Sierpinski gasket geometry (SGG). Layers’ separation has been achieved by using 4 mm air layer for the purpose of surface wave reduction. Proximity coupled feed technique with 50 Ω microstrip line is used. Both the radiating layers and the feeder are placed on 1.59 mm thick FR4 substrate.
The simulation results show that the antenna can operate at 11 different resonance frequencies 2.08, 2.32, 3.17, 4.04, 4.49, 5.14, 6.20, 7.35, 9.22, 11.1, 11.98 (GHz), with bandwidths of 61, 36, 204, 82, 349, 673, 1142, 1481, 507, 1770 and 530 (MHz) respectively. Gain values up to 6.03 dB were obtained.
Keywords: Multiband/Wideband antenna, Fractal geometries, Multilayer patch antenna, Proximity coupled feed technique.
…………………………………………………………………………………………………………………………
ÖZ: Çalışma, farklı haberleşme sistemlerinde kullanılabilecek, çok katmanlı fraktal yama anten tasarımı sunmaktadır. Önerilen anten, iki katmanlı fraktal geometrik yapı kullanılarak elde edilmiş çokbantlı / genişbant olarak kullanılabilir.Birinci ve ikinci katmanlarında sırasıyla dikdörtgen ve üçgen yamalar kullanılarak özgün bir anten tasarlanmıştır. Sierpinski Carpet Fractal (SCF) ve Minkowski Fractal (MSF) geometrileri birleşimi birinci katmanda, Sierpinski Gasket Fractal (SGF) ve Koch Snowflake Fractal (KSF) geometri birleşimi ise ikinci katmanda kullanılmıştır. Electromanyetik yüzey dalgalarını ortadan kaldırmak için, katmanlar arasında 4’er mm’lik hava katmanları yaratılmıştır. Anten beslemesi, miktoşerit hat ile yakınlık bağdaştırma temassız besleme yöntemi ile gerçekleştirilmiştir. Besleme ve radyasyon katmanları 1.59 mm’lik FR4 maddesi üzerine yerleştirilmiştir. 50
FEKO simülatörü ile elde edilen sonuçlar, tasarlanan antenin 11 değişik rezonans frekansında, 2.08, 2.32, 3.17, 4.04, 4.49, 5.14, 6.20, 7.35, 9.21, 11.096, 11.98 (GHz), frekans bantgenişlikleri ile 61, 36, 204, 82, 349, 673, 1142, 1481, 507, 1770 and 530 (MHz), çalışabileceğini ve kazanç değerlerinin de 6.03dB’ye kadar ulaşabildiğini göstermektedir.
Anahtar Kelimeler: Çokbant/genişbant anten, fraktal geometriler, çok katmanlı yama anten, yakınlık bağdaştırma temassız besleme.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Antennas (Electronics)
Multiband/Wideband antenna, Fractal geometries, Multilayer patch antenna, Proximity coupled feed technique.
Multi - band fractal antenna modeling
Thesis
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oai:i-rep.emu.edu.tr:11129/15352014-11-27T00:00:45Zhdl_11129_3
EMU I-REP
author
Sadeghi, Bashir
2014-11-26T06:48:03Z
2014-11-26T06:48:03Z
2013-09
Sadeghi, Bashir. (2013). Shift -variance of linear periodically shift-variant systems and non-stationarity of wide-sense cyclostationary random processes. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1535
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Runyi Yu.
ABSTRACT: We study shift-variance of linear periodically shift-variant (LPSV) systems and non-stationarity of wide-sense cyclostationary (WSCS) random processes (with continuous-time input and output). We determine how far an LPSV system is away from the space of linear shift-invariant systems. We consider the average of commutator’s norm as a shift-variance level, and the normalized version of it is then defined to be a shift-variance measure (SVM). Extending these ideas to random processes, we then consider non-stationarity of WSCS random processes based on the SVM of the autocorrelation operator of the process. We also introduce the expected shift-variance (which is a kind of SVM) for LPSV systems when the input is wide-sense stationary (WSS) random process, allowing us to investigate properties of output of an LPSV system when its input is a WSS random process. Finally, we analyze shift-variance and non-stationarity of generalized sampling-reconstruction
processes, discrete wavelet transforms, double sideband amplitude modulated signals and double sideband amplitude modulation systems. Keywords: Linear periodically shift-variant system, Shift-variance, Generalized sampling-reconstruction process, Non-stationarity.
…………………………………………………………………………………………………………………………
ÖZ: Bu çalışmada, doğrusal periyodik kayan-değişke sistemlerin (LPSV) kayma farkları ve
geniş anlamda dönemli durağan (WSCS) rastgele süreçlerin (sürekli zaman giriş ve çıkış) durağan olmama durumu incelenmiştir. Bir LPSV sistemin doğrusal kayandeğismez sistem uzayından uzaklığı belirlenmiştir. Komütatör normunum ortalaması, bir kayma farkı düzeyi olarak ele alınmış ve normalize değerleri kayma farkı ölçüsü (SVM) olarak tanımlanmıştır. Bu düşünceler, rastgele süreçlere uygulanarak, geniş anlamda dönemli durağan (WSCS) rastgele süreçlerin durağan olmama durumu, sürecin otokorelasyonunun kayma farkı ölçüsüne (SVM) uyarlanmıştır. Ayrıca, doğrusal periyodik kayan-değişke sistemlerin (LPSV) kayma farkı, giriş değişkeni geniş anlamda durağan (WSS) bir süreç iken açıklanmıştır. Bu durum, LPSV sistemin girişi geniş anlamda durağan iken, sistemin çıkışını incelememize olanak sağlar. Son olarak, genelleştirilmiş örnekleme yapılandırmasının, ayrık dalgacık dönüşümünün, çift yan bant genlik modülasyonlu işaretlerin ve çift yan bant genlik modülasyon sistemlerinin kayma farkı ve durağan olmaması incelenmiştir.
Anahtar Kelimeler: Doğrusal Periyodik Kayan-Değişke Sistem, Kayma Farkı, Genelleştirilmiş Örnekleme Yapılandırması Süreci, Durağan Olmama.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Signal Processing
Linear Periodically Shift-Variant System, Shift-Variance, Generalized Sampling-reconstruction process, Non-Stationarity
Shift -variance of linear periodically shift-variant systems and non-stationarity of wide-sense cyclostationary random processes
Thesis
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oai:i-rep.emu.edu.tr:11129/16362015-03-12T00:01:46Zhdl_11129_3
EMU I-REP
author
Ehineni, Kehinde Oluwaseyi
2015-03-11T08:48:55Z
2015-03-11T08:48:55Z
2014-09
Ehineni, Kehinde Oluwaseyi. (2014). Partial Discharge Modeling by Simulink. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1636
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Suna Bolat.
ABSTRACT: The presence of partial discharges (PD) is one of the most conspicuous signs of
defects and ongoing defection of insulation in electrical equipment. In this study,
partial discharges (PD) are simulated by adopting the classical PD model. In the
literature, different models for partial discharges have been presented. The capacitive
void model has been effectively instrumental in the study of void breakdown and its
generated transients. As an alternative to this, the induced charge concept is been
introduced expressing strong criticism against the capacitance modeling of voids.
The aim of the study is to use this concept to examine partial discharges in solid
insulators with Simulink. A model is created that can effectively represent the
existence of a void in an XLPE cable, implemented in MATLAB Simulink and
simulated. The effect of the conductor-void proximity on the magnitude of discharge
is verified as well as the effect of void sizes. The simulated results are compared with
other Simulink models created in other literatures.
By this study, it is possible to get one step closer to understand the physics behind
partial discharge phenomena.
Keywords: Partial Discharge, Void, Induced charge concept, Simulink.
…………………………………………………………………………………………………………………………
ÖZ: Elektriksel yalıtımının bozulması sürecinin ve yalıtım hatasının en göze çarpan
göstergelerinden biri Kısmi Boşalmalardır (KB). Bu çalışmada, kısmi boşalmaların
benzetimi klasik KB modelinin uyarlanmasıyla gerçekleştirilmiştir. Literatürde,
kısmi boşalmalar için farklı modeller sunulmuştur. Kapasitif model, katı yalıtkan
içindeki boşlukta meydana gelen boşalmanın yarattığı geçici durumları incelemek
için, çok uzun zamandır kullanılmaktadır. Boşluğun kapasitif modeline bir alternatif
olarak, kapasitif modeli eleştiren endüklenmiş yük kavramı ortaya sürülmüştür.
Bu çalışmanın amacı, Simulink ile katı yalıtkan içindeki boşluklarda meydana gelen
kısmi boşalmaların bu kavramla incelenmesidir. Bir XLPE kablo içindeki boşluğu
etkin bir şekilde yansıtan bir model oluşturulmuş ve MATLAB Simulink kullanılarak
benzetimi yapılmıştır. İletken – boşluk yakınlığının ve boşluk boyutunun boşalma
şiddetine etkisi incelenmiştir. Benzetim sonuçları, literatürdeki diğer benzetim
çalışmalarıyla karşılaştırılmıştır.
Bu araştırma yardımıyla, kısmi boşalma olaylarının arkasındaki fiziksel
mekanizmayı anlamaya bir adım daha yakınlaşılmıştır.
Anahtar Kelimeler: Kısmi boşalma, Boşluk, Endüklenmiş yük kavramı, Simulink.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Electric power distribution
Electric discharges
Partial Discharge, Void, Induced Charge Concept, Simulink
Partial Discharge Modeling by Simulink
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1636/3/EhineniKehinde.pdf.txt
File
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1636/1/EhineniKehinde.pdf
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oai:i-rep.emu.edu.tr:11129/16862015-04-07T23:01:16Zhdl_11129_3
EMU I-REP
author
Yurtkan, Kamil
2015-04-07T06:49:15Z
2015-04-07T06:49:15Z
2014-08
Yurtkan, Kamil. (2014). Entropy Based Feature Selection for 3D Facial Espression Recognition. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1686
Doctor of Philosophy in Electrical and Electronic Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assoc. Prof. Dr. Hasan Demirel.
ABSTRACT: Human face is the most informative part of the human body that carries information
about the feelings of the human. Recent improvements in computer graphics and
image processing fields of computer science make facial analysis and synthesis
algorithms applicable with the current digital Central Processing Units (CPUs). The
information embedded to the human face can be analyzed with facial movements and
mimics. The extracted parameterized data can be used in defining the facial
expressions. Improvements in Human-Computer Interaction (HCI) systems have
placed face processing research studies into a crucial stage in order to develop
algorithms and applications. Therefore, facial expression recognition is an essential
part of face processing algorithms.
The thesis presents novel entropy based feature selection procedures for person
independent 3D facial expression recognition. The coarse-to-fine classification model
and the expression distinctive classification model which are both based on Support
Vector Machine (SVM) are used for the proposed feature selection procedures.
Information content of the facial features is analyzed in order to select the most
discriminative features which maximize expression recognition performance. Entropy
and variance have been employed as information content metrics.
The input features are 3D facial feature points provided in MPEG-4 standard. A face is
represented with 3D positions of geometric facial feature points. The feature selection
algorithm selects the best feature points using novel entropy based method and
represents the face with the selected points. Selections are done depending on Fisher’s
criterion. High entropy facial feature points maximizing Fisher’s criterion are selected.
The main contributions of the thesis are entropy based feature selections based on two
different classifier models. The first one is a two-level coarse-to-fine classifier model
and the second one is expression distinctive classifier model. For each model, entropy
based feature selection is applied. Feature selection in two-level classifier model is
accomplished in two levels. First, the best features are selected that classify the
unknown input face into the one of the big expression classes, which are Class 1 and
Class 2. Class 1 includes anger, disgust and fear expressions, where Class 2 includes
happiness, sadness and surprise expressions. In the second level, the best features for
each class are selected that classifies an expression into one of the three expressions
presented in the selected class. As a result, three different feature models are proposed
for the two-level coarse-to-fine classifier model. One feature model in order to classify
into Class 1 and Class 2, and the two other feature models for each class’s inner class
classification processes. The second classifier model is the expression distinctive
model in which entropy based feature selection method is applied to each expression
specifically. Thus, the feature selection algorithm proposes six different feature
models that maximize Fisher’s criterion for each expression.
The proposed algorithms are tested in BU-3DFE and Bosphorus databases and the
experimental results provide significant improvements on recognition rates. Proposed
methods achieve comparable recognition rates for all of the six basic expressions
which overcome the problem of having very high recognition rates for some of the
expressions and unacceptable rates for some others, resulting in good average rates.
Keywords: Facial expression recognition, feature selection, face biometrics, entropy,
information content.
…………………………………………………………………………………………………………………………
ÖZ:
İnsan yüzü, insan bedeninde kişinin duygu durumu hakkında bilgi taşıyan en önemli
kısımdır. İçinde bulunduğumuz dönemdeki bilgisayar bilimi araştırmalarının sunduğu
yenilikler ve hatırı sayılır gelişme gösteren bilgisayar grafikleri ile imge işleme
algoritmaları, günümüz sayısal işlemcilerinin insan yüzünü işleyebilmelerine olanak
tanımaktadırlar. Parametrelendirilmiş yüz hareketleri, yüz ifadelerinin analizi ve
tanınması için kullanılabilmektedir. Temelinde İnsan Makine Etkileşimi (İME) olan
uygulamaların gelişimi, insan yüzünün sayısal işlemciler tarafından işlenmesi
gereksinimini çok kritik bir safhaya taşımıştır. İnsan yüzünde gömülü olan bilginin
çıkarımı yüzdeki hareketlerin ve mimiklerin tespiti ile mümkündür. Bu nedenle, yüz
ifadeleri analizi, yüz işlemeyi kullanan algoritmalar için vazgeçilmez bir kısım
konumundadır.
Tezde, kişiden bağımsız yüz ifadeleri tanınmasına yönelik öznitelik seçimi için
geliştirilen özgün yöntemler sunulmaktadır. Destek Vektör Makinesi (DVM) tabanlı
iki farklı sınıflandırma modeli sunulmuştur. Bunlar kabadan inceye doğru
sınıflandırıcı ve yüz ifadesine özel sınıflandırıcı modelleri olarak ikiye ayrılır. Yüz
özniteliklerinin seçimi için önerilen yöntem her iki modele de uygulanmıştır. En
ayrıştırıcı özniteliklerin seçimi için yüz ifadelerinin oluşumu esnasında öznitelikerin
bilgi içeriği incelenmiştir. Bilgi içeriğinin ölçümünde entropi ve varyans ölçüm
metrikleri olarak kullanılmıştır. Yüz ifadelerinin oluşumu esnasında en çok bilgiyi
taşıyan ve tanınma başarısını geliştiren yüz öznitelikleri seçilmektedir.
Sistemin girdi öznitelikleri MPEG-4 standardında tanımlanan yüz öznitelik
noktalarıdır. Yüz, bu geometrik noktaların 3 boyutlu konum bilgisinden temsil
vi
edilmektedir. Özgün öznitelik seçim yöntemi, söz konusu öznitelik noktalarından
entropiye göre seçim yapmakta ve seçilen özniteliklerle yüzü temsil etmektedir.
Öznitelik seçimleri Fisher kriteri göz önünde bulundurularak yapılmıştır. Fisher
kriterinin en büyük olduğu yüksek entropiye sahip noktalar seçilmektedir. Tezin iki
ana katkısı öznitelik seçimlerinin iki farklı sınıflandırma modeline yönelik yapılması
ve sonucunda farklı öznitelik modellerinin önerilmesidir. Birinci model iki seviyeli
kabadan inceye doğru sınıflandırma modeli, ikinci model ise yüz ifadesine özel
sınıflandırıcı modelidir. Öznitelik seçim yöntemi her iki modele farklı şekilde
uygulanmıştır. İki seviyeli modelde öznitelik seçimi önce birinci seviye olan ve
bilinmeyen yüz vektörünün iki büyük sınıfa ayrıldığı seviyede yapılmıştır. Bunlar
Sınıf 1 ve Sınıf 2 olarak isimlendirildiğinde, Sınıf 1 içerisinde öfke, ,iğrenti ve korku
ifadeleri, Sınıf 2 içerisinde ise mutluluk, üzüntü ve sürpriz ifadeleri bulunmaktadır.
İkinci seviye için ise mevcut üç ifade arasında en ayrıştırıcı öznitelikleri bulmak için
öznitelik seçimi yapılmıştır. Bu seviyede seçilen öznitelikler her bir sınıfın sınıf içi
sınıflandırma başarısını artıracak şekilde yapılmıştır. Buna göre ilk seviye için bir ve
ikinci seviyedeki herbir sınıf için öznitelik seçimi yapılmış, toplamda üç farklı
öznitelik modeli önerilmiştir. Yüz ifadesine özel sınıflandırıcı modelinde ise entropiye
dayalı öznitelik seçimi her bir temel yüz ifadesi için ayrı ayrı yapılmış ve sonuç olarak
bu model için Fisher kriterinin en büyük olduğu altı farklı öznitelik modeli
önerilmiştir.
Önerilen yöntemler BU-3DFE ve Bosphorus veritabanları üzerinde test edilmiş ve
ümit verici sonuçlar elde edilmiştir. Önerilen yöntemlerde tüm temel yüz ifadelerinin
yakın ve yüksek oranlarda tanınma başarısı gösterdiği gözlemlenmiştir. Mevcut bazı
sistemlerde görülen bir problem olan belli yüz ifadelerinin çok yüksek, diğer yüz
ifadelerinin ise başarıyla tanınması fakat ortalama tanınma başarısının yüksek olması,
vii
önerilen metodlarda tüm yüz ifadelerinde yakın tanınma oranları elde edilerek
aşılmıştır.
Anahtar Kelimeler: Yüz ifadeleri tanıması, öznitelik seçimi, entropi,
yüz biyometrisi, bilgi içeriği.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Image processing - Digital techniques
Image Processing and Computer Vision
Facial Expression Recognition, Feature Selection, Face Biometrics, Entropy, Information Content
Entropy Based Feature Selection for 3D Facial Espression Recognition
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/17472015-06-25T23:00:52Zhdl_11129_3
EMU I-REP
author
Aimua, Fidelis
2015-06-25T10:30:26Z
2015-06-25T10:30:26Z
2015-02
Aimua, Fidelis. (2015). Contour optimization of a pin insulator using neural network. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1747
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2015. Supervisor: Assist. Prof. Dr. Suna Bolat.
ABSTRACT: Insulator geometry strongly affects the distribution of electric field along the surface of the insulator. If the field distribution is not uniform, that stresses the insulator unevenly which most often may lead to unnecessary loss of energy, flashover and eventual breakdown of the power network system. As the desire to have a more efficient, effective and reliable system devoid of losses increases; the need for a well optimized insulator arises.
In this study, neural network is used to obtain an optimized form of a pin insulator. Neural network is trained by using geometric information of the pin insulator and field intensities in order to provide a field distribution as uniform and minimum as possible along the insulator surface. Electric field intensities along the surface for different insulator profiles are obtained numerically by using finite element method.
Finally, the result obtained such as the mean absolute error of less than 0.1 at optimum, shows that the network has successfully been used to optimize the contour geometry of the pin insulator.
Keywords: High voltage, insulator, contour optimization, neural network, electric field distribution.
…………………………………………………………………………………………………………………………
ÖZ: İzolatör geometirisi, izolator yüzeyindeki elektrik alan dağılımını büyük oranda etkiler. Eğer izolatör yüzeyinde elektrik alan dağılımı düzgün değilse, izolatör zorlanır; bu durum genellikle güç sisteminde gereksiz enerji kaybına, atlamaya ve zamanla delinmeye yol açabilir. Daha verimli, etkin ve güvenilir kayıpsız bir sistem ihtiyacı arttıkça, optimum izolatör ihtiyacı da artar.
Bu çalışmada, bir mesnet izolatörünün optimizasyonu için yapay sinir apı kullanılmıştır. Yapay sinir ağı, izolatörün geometrik bilgileri ve alan şiddetleri kullanılarak mümkün oladuğu kadar düzgün ve düşük şiddetli alan dağılımı sağlayacak şekilde eğitilmiştir. Farklı izolatör biçimleri için yüzey boyunca elektrik alan şiddetleri, sonlu elemanlar yöntemi kullanılarak sayısal olarak elde edilmiştir.
Elde edilen sonuç, % 0,1 ortalama mutlak hata ile, sinir ağının mesnet izolatörü optimizasyonunda başarılı olduğunu göstermektedir.
Anahtar Kelimeler: Yüksek gerilim, izolatör, biçim optimizasyonu, yapay sinir ağı, elektrik alan dağılımı.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Electric insulators and insulation - Electric power distribution - High tension
Electric cables - Insulation
High Voltage, Insulator, Contour Optimization, Neural Network, Electric Field Distrubution
Contour optimization of a pin insulator using neural network
Thesis
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URL
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oai:i-rep.emu.edu.tr:11129/18142015-10-27T00:00:15Zhdl_11129_3
EMU I-REP
author
Mohammadzadeh, Saeed
2015-10-26T13:46:22Z
2015-10-26T13:46:22Z
2014-02
Mohammadzadeh, Saeed. (2014). A Generalized Loading Algorithm for Adaptive Beamforming in Uniform Linear Array. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1814
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Prof. Dr. Osman Kükrer.
ABSTRACT: The aim of this work is focused on designing a new generalized loading approach for Uniform Linear Array (ULA). This method achieves robust adaptive beamforming against direction-of-arrival (DOA) mismatches by shaping the directional response of the adaptive Uniform Linear Array. To achieve this purpose, we consider an ULA with sensors, which are located at half wavelength spacing. The desired spatial signal impinges from a specific direction, such that the presumed direction has a mismatch with the true direction. Furthermore we assume that the desired signal components are present in the beamformer training data snapshots and that the data sample size is limited. Therefore, we desire to develop a robust adaptive beamformer to improve the performance against inaccuracies caused by limited sample size and the look direction mismatch by shaping the directional response of the array. N
The ability of the directional response shaping (DRS) will follow the modified conventional loading methods for an adaptive ULA. However, it stresses on the range of specified direction (cut off angle) in the presence of undesired interferences.
In this technique, a general loading matrix is considered which is derived from a weight function. This matrix is added to the estimated correlation matrix, such that the directional response of the beamformer is shaped. Also, the loaded matrix minimizes the output power of the beamformer. By using the loaded matrix, beamformer weight vector will approach to an optimal value regarding the output SINR. The weight function can be chosen to further suppress the interferences by making the weight large in the vicinity of DOA’s of interferences.
To demonstrate the capability of the proposed method, it is compared with some of the well-known methods such as Sample Matric Inversion (SMI), Loaded Diagonally Sample Matrix Inversion (LSMI), Robust Capon Beamformer (RCB), Iterative Minimum Variance Beamformer (IRMVB (Li’s)) algorithms. The results clarify that, convergence of our method to optimal SINR in different conditions is superior. Keywords: Adaptive Beamformer, Uniform Linear Array (ULA), Mismatch, Interferences, Generalized Loading matrix, Correlation Matrix.
…………………………………………………………………………………………………………………………
ÖZ: Bu çalışmanın amacı uyarlanır demet oluşturmada genel yükleme yaklaşımı geliştirmektir. Bu yaklaşım, uyarlanır doğrusal dizgenin yönsel tepkimesini şekillendirmek suretiyle, yönsel varma açısındaki uyumsuzluklara karşı dayanıklı hale gelir.
Bu amaca ulaşmak için duyarga sayısı N ve duyargalar arası uzaklığın yarı dalgaboyu olan bir tekdüze doğrusal dizge ele aldık. İstenen işaretin, gerçek yaklaşım yönü ile varsayılan yaklaşım yönü arasında bir uyumsuzluk olacak şekilde dizgeye ulaşmaktadır. Ayrıca, istenen işaretin demet-oluşturucunun alıştırma veri dizilerinde mevcut olduğu, ve örnek veri büyüklüğünün sınırlı olduğu varsayılmıştır.
Bu sorunlar karşısında uyarlanır demet-oluşturucunun başarımını artırmak için dizgenin yönsel tepkimesini şekillendirmeye çalıştık.
Bu yöntemde, bir ağırlık işlevinden elde edilen genel bir yükleme matrisi üzerinde durduk. Bu matris kestirilen ilinti matrisi ile toplanır, ve sonuçta demet-oluşturucunun yönsel tepkimesi şekillendirilmiş olur. Bu yolla demet-oluşturucunun ağırlık vektörü çıkış SINR’ı açısından en iyi durumu yaklaşır. Ağırlık işlevi, karışma işaretlerinin varış yön açılarının cıvarında büyük seçilerek bu işaretler daha etkili olarak bastırılır.
Önerilen yöntemin olumlu özelliklerini göstermek için, SMI, LSMI, RCB ve IRMVB gibi iyi bilinen diğer yöntemlerle karşılaştırıldı. Sonuçlar, önerilen yöntemin farklı durumlar için en iyi SINR değerlerine yakınlığı açısından üstün olduğunu göstermiştir.
Anahtar Kelimeler: Uyarlanır Demet Oluşturmada, , Tekdüze Doğrusal Dizge, Uyumsuzluk, Karışım, Ilinti Matrisi, Genelliştirilmiş Yükleme Matrisi.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Adaptive Beamformer, Uniform Linear Array (ULA), Mismatch, Interferences, Generalized Loading matrix, Correlation Matrix
A Generalized Loading Algorithm for Adaptive Beamforming in Uniform Linear Array
Thesis
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oai:i-rep.emu.edu.tr:11129/18192015-10-28T00:00:23Zhdl_11129_3
EMU I-REP
author
Mohamed, Emad M.
2015-10-27T05:56:02Z
2015-10-27T05:56:02Z
2013-05
Mohamed, Emad M. (2013). Performance Analysis of Transmit Diversity STBC-OFDM and Differential STBC-OFDM Over Fading Channels. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1819
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT: Alamouti space-time block coding (A-STBC) is a relatively well known coding technique that is employed to enhance the capacity of wireless communication systems without affecting the bandwidth efficiency. Furthermore, A-STBC is known to have a linear decoding complexity which has made it one of the most popular among space time codes (STCs). The decoding of space-time block codes, however, requires knowledge of channel state information (CSI) at the receiver and in general, channel parameters are assumed to be known (assumes that channel estimation is possible). However, when there is high mobility and the channel conditions are fluctuating rapidly it may be difficult to obtain perfect or close to perfect estimates for the channel. To alleviate this problem another space-time block coding technique known as Differential Space-Time Block Coding (DSTBC) has been proposed. Differential phase shift keying (DPSK) which is employed by DSTBCs is a common form of phase modulation that conveys data by changing the phase of the carrier wave. The decoder in DPSK modulation does not require CSI since the transmitted symbols depend on the previous symbol and the decoder would sense the data from symbols that come one after another. When channel fluctuations are very high DSTBCs need to be used at the expense of lower bit error rate.
The work presented herein, provides a link level bit error rate analysis of none line- of-sight (NLOS) Alamouti space-time block coded with Orthogonal Frequency Division Multiplexing (OFDM) using either BPSK or QPSK modulation. OFDM is a multicarrier modulation technique where a high rate data stream is sub-divided into a number of lower rate data streams and transmitted over a number of subcarriers. The performance increment due to OFDM comes from the fact that the usage of a guard interval that help reduce or completely eliminate the interference between symbols due to multipath effect.
The simulation results presented in this thesis have all been obtained using the readily available MATLAB platform and writing dedicated functions for different tasks. The results have been presented in four parts. The first part provides the bit error rate performance for BPSK modulated data transmitted over a Rayleigh fading channel. This is then followed by a performance analysis of OFDM over the AWGN channel using either BPSK or QPSK modulation. Third part demonstrates the BER vs. SNR for Alamouti STBC and Alamouti DSTBC coded data transmitted over a Rayleigh fading channel without using OFDM. Finally, part four will provide STBC and DSTBC coded OFDM performance when BPSK and QPSK are the preferred modulation and the channel is again the Rayleigh fading channel.
The work presented clearly demonstrates that even though OFDM by itself is giving good performance by mitigating inter-symbol interference, combining OFDM with a transmit diversity technique like Alamouti STBC helps further improve the link level BER performance. The simulation results indicate that when no CSI is available and DSTBC needs to be employed, the system performance will degrade approximately by 2.2dB at a BER of 10-4 (in comparison to STBC-OFDM using BPSK).
Keywords: STBC, DSTBC, OFDM, Rayleigh Fading, BER.
…………………………………………………………………………………………………………………………
ÖZ: Alamouti uzay-zaman blok kodlama yöntemi (A-UZBK) nispeten iyi tanınan ve bant genişliği verimini etkilemeksizin kablosuz iletişim kapasitesini artırmak üzere yararlanılan bir yöntemdir. Buna ek olarak A-UZBK çözücüsünün doğrusal bir kod çözme karışıklığına sahip oluşu da bu yöntemi diğer uzay-zaman kodlayıcılar arasında öne çıkarmaktadır. Genellikle Alamouti uzay-zaman blok kodlama tekniğinin kod çözücüsü kanal durum bilgilerinin (KDB) bilinmesini gerektirmektedir ki bu da kanal tahmininin mümkün olduğu varsayımını gerektirir. Fakat yüksek hareketlilik oranının bulunduğu ve kanal koşullarının hızlı bir dalgalanma gösterdikleri durumlarda kanal için mükemmel veya mükemmele yakın tahminlerin elde edilmesi zorlaşabilmektedir. Bu problemin hafifletilmesi için Fark-Kodlamalı Uzay-Zaman Blok Kodlama (FK-UZBK) yöntemi önerilmiştir.
FK-UZBK’lar tarafından kullanılan diferansiyel faz değiştirme anahtarlama (DPSK) yöntemi, taşıyıcı dalganın fazını değiştirerek verileri ileten yaygın bir faz geçiş şeklidir. İletilen semböller bir önceki semböle bağlı olup şifre çözücü verileri birbiri ardına gelen semböllerden algıladığından DPSK modülasyondaki şifre çözücü KDB’ni gerektirmemektedir. Kanal dalgalanmalarının yüksek olduğu durumlarda FK-UZBK’ların daha düşük bit hata oranı pahasına kullanılması bir zorunluluk olmaktadır. Bu çalışmada, Alamouti uzay-zaman blok kodlarıyla ikili ve dörtlü faz kaydırmalı kipleme kullanan Dikgen Frekans Bölüşümlü Çoğullama (DFBÇ) yöntemi birleştirilerek görüş hattı dışındaki (NLOS) durumlar için link seviyesinde bit hata oranı analizi gerçekleştirilmiştir. DFBÇ, yüksek hızlı veri akışına sahip bir katarın daha düşük hızlardaki birden fazla katara bölündüğü ve birçok alt taşıyıcı üzerinden aktarma yapılan çoklu taşıyıcılı bir modülasyon tekniğidir. DFBÇ’deki performans artışı, çoklu yol etkisinden kaynaklanan semböller arası karışmaların azaltılması veya tamamen ortadan kaldırılmasına yardımcı olan bir koruma bandının (çevrimsel öntakı) kullanımı ile sağlanmaktadır. Bu tez çalışmasında sunulan tüm benzetim sonuçları MATLAB platformunu kullanarak ve gerekli tüm görevler için adanmış fonksiyonlar yazarak elde edilmiştir. Sonuçlar dört bölüm halinde sunulmuştur. İlk bölüm, ikili faz kaydırmalı kiplenmiş verinin bir Rayleigh kanalı üzerinde göndrildiği durumlardaki bit hata oranı verimini sunmaktadır.
Daha sonra ikinci bölümde ikili ve dörtlü faz kaydırmalı kipleme kullanan DFBÇ’nin Toplanır Beyaz Gauss Gürültü (TBGG) kanal üzerindeki performansı incelenmiştir. Üçüncü bölümde DFBÇ kullanılmadan yavaş sönümlemeli bir Rayleigh kanalı üzerinden aktarılan Alamouti UZBK ve Alamouti FK-UZBK ile kodlanmış veriler için bit-hata-oranı karşılaştırma sonuçları sunulmaktadır. Son olarak dördüncü bölüm ikili ve dörtlü faz kaydırmalı kipleme tekniklerinin tercih edildiği ve kanalın yine yavaş sönümlemeli bir Rayleigh kanalı olduğu durumlar için A-UZBK ve Alamouti FK-UZBK yöntemleri ile kodlanmış DFBÇ için elde edilen bit-hata-oranlarını sunmuştur.
Yapılan çalışmalarda görülmüştür ki her ne kadar da DFBÇ semböller arası karışmaları hafifleterek tek başına iyi bir performans gösterse de, DFBÇ’nin Alamouti UZBK gibi bir gönderim çeşitleme tekniği ile birleşiminden elde edilecek bağlantı düzeyi bit-hata-oranları daha da iy olmaktadır. Simülasyon sonuçları KDB’nin mevcut olmadığı ve FK-UZBK’nin kullanımının gerekli olduğu durumlarda sistem performansının 10-4 bit-hata-oranında yaklaşık olarak 2.2 dB gerilediğini göstermiştir (ikili faz kaydırmalı kipleme kullanan UZBK-DFBÇ ile karşılaştırıldığında).
Anahtar Kelimeler: UZBK, Diferansiyel UZBK, DFBÇ, Çoklu-Çıkış, Rayleigh Zayıflama.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Wireless Communication Systems
Orthogonal frequency division multiplexing
STBC, DSTBC, OFDM, Rayleigh Fading, BER
Performance Analysis of Transmit Diversity STBC-OFDM and Differential STBC-OFDM Over Fading Channels
Thesis
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oai:i-rep.emu.edu.tr:11129/18262015-10-29T00:00:21Zhdl_11129_3
EMU I-REP
author
Şenergin, Mete Eray
2015-10-28T05:51:51Z
2015-10-28T05:51:51Z
2014-11
Şenergin, Mete Eray. (2014). M188: A New Preprocessor for Better Compression of Text and Transcription Files. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1826
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
ABSTRACT: Compression of natural language text files is worthwhile for communities such as Project Gutenberg in terms of their storage space and even for text messaging applications' bandwidth efficiency. Thus, there has been extensive research on preprocessing techniques. The thesis proposes a new word-based preprocessor named METEHAN188 (M188). The proposed method provides better compression of text and transcription files when concatenated with some well known data compression algorithms. M188 and state-of-the-art preprocessors; starNT, WRT, ETDC, SCDC and RPBC are compared while concatenated with PPMD and PPMonstr. M188 differs from the other methods; it has larger dictionary which provides coverage of more words, the disadvantage is that it slows down the process; it has longer alphabet which gives M188 the opportunity of assigning shorter codewords; it does not code space and punctuation characters which speeds up M188 also output a more predictable scheme. During experiments, Wall Street Journal, Calgary, Canterbury, Large, Gutenberg and Pizza & Chili corpora are used. For the files in Calgary corpus the experimental results yield that M188 can overcome all other preprocessing techniques in terms of compression effectiveness. For the files selected from the project Gutenberg and Canterbury corpora WRT+PPMonstr has 1.22% gain in over M188+PPMonstr on the average. The results showed that best two preprocessors for compression effectiveness are M188 and WRT and for timing performance ETDC and SCDC are the fastest preprocessors.
Keywords: LIPT, StarNT, WRT, Universal Preprocessor, PPMonstr, M188, ETDC, SCDC, RPBC, PPM, Data Compression.
…………………………………………………………………………………………………………………………
ÖZ:
Gutenberg projesi gibi toplulukların veri depolama alanlarını ve hatta metin mesajlaşma uygulamalarının bant genişliğini kazanımı için metin sıkıştırma kayda değer bir uygulamadır, araştırmalar önişlemcilerin kayda değer kazanç sağladığını göstermiştir. İş bu tez, metin dosyaları için sıkıştırılma oranını en iyileştirmeye yönelik yeni bir önişlemciyi önermektedir. Bu önişlemciyi Metehan 188 ya da M188 olarak adlandırmış bulunuyorum. M188 ile LIPT, StarNT, WRT, ETDC, SCDC, RPBC önişlemcileri PPMonstr ve PPMD sıkıştırma algoritmalarına önişlem yapacak şekilde kullanılmış daha sonrasında zaman ve sıkıştırma başarımı açısından kıyaslanmıştır. Diğer metotlara göre; M188 daha büyük bir sözlüğe sahiptir bu da kodlama kapsamını genişletmiştir; ayrıca, M188 kodlarını daha uzun bir alfabeden yararlanarak yaratmaktadır, bu sayede daha kısa kodlar atayabilmektedir. Son olarak M188 boşluk ve noktalama işaretlerini kodlamamaktadır bu da zamanlamada kazanç sağlamakta olup sıkıştırma algoritmalarına daha tahmin edilebilir bir yapı sağlamaktadır. Deneylerde; Wall Street Journal, Calgary, Canterbury, Large, Gutenberg ve Pizza & Chili metin derlemelerinden alınan dosyalar kullanılmıştır. Calgary dosyalarında M188 diğer tüm önişlemcilerden daha iyi sıkıştırma sağlamıştır. Gutenberg ve Canterbury dosyalarında ise WRT+PPMonstr ikilisi M188+PPMonstr 'ye göre yüzde 1.22 daha iyi sıkıştırma başarımı sağlamıştır. Sonuç olarak sıkıştırma başarımları en iyi olan iki algoritma M188 ve WRT olarak belirlenmiştir. En hızlı iki algoritma ise ETDC ve SCDC olarak belirlenmiştir.
Anahtar Kelimeler: LIPT, StarNT, WRT, Evrensel Önişlemci, PPMonstr, M188, ETDC, SCDC, RPBC, PPM, Veri Sıkıştırma.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Text processing (Computer science)
LIPT, StarNT, WRT, Universal Preprocessor, PPMonstr, M188, ETDC, SCDC, RPBC, PPM, Data Compression
M188: A New Preprocessor for Better Compression of Text and Transcription Files
Thesis
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oai:i-rep.emu.edu.tr:11129/18492015-11-14T00:00:27Zhdl_11129_3
EMU I-REP
author
Farazandeh, Fazel
2015-11-13T07:29:26Z
2015-11-13T07:29:26Z
2012-08
Farazandeh, Fazel. (2012). Hybrid Energy Efficient Routing Protocol for Wireless Sensor Networks. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1849
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2012. Supervisor: Prof. Dr. Şener Uysal.
ABSTRACT: Deployment of wireless sensor networks is rapidly increasing in many different monitoring and control applications. Design and implementation of wireless sensor networks, requires diverse knowledge from several different disciplines. Therefore, this is a new interdisciplinary technology, which has been discussed widely in the literatures.
Sensor nodes of the WSNs are powered by limited resources, which are mostly the batteries with constrained energy. Design of an energy efficient routing protocol contributes to increasing the network lifetime. In this thesis, based on energy analysis of the routing protocols, a new method of data transmission is proposed. However, design and applying a routing protocol in WSNs is very application specific and can be changed for different parameters of the environment.
The new proposed method is applicable for different network sizes, while the energy efficiency of the protocol is the main characteristics of the design. Moreover, some other important parameters, which affect the efficiency of the transmission, such as number of nodes and massage length, are considered during the simulations.
Keywords: Routing protocols, Energy Efficiency, Wireless Sensor Networks, Energy analysis.
…………………………………………………………………………………………………………………………
ÖZ: Son zamanlarda kablosuz sensor ağlarının birçok değişik uygulamadaki kullanımı hızlı bir şekilde artmaktadır. Kablosuz Sensör Ağlarının tasarımı ve uygulaması farklı alanlarda bilgi sahibi olunmasını gerektirmektedir. Dolaysıyla, bu konu birçok araştırmada incelenen yeni bir disiplinlerarası teknoloji olarak düşünülebilmektedir.
Kablosuz Sensör Ağlarındaki sensör düğümlerinin enerjisi çoğunlukla sınırlı kapasiteye sahip olan pillerden oluşan sınırlı kaynaklar tarafından temin edilmektedir. Enerji açısından verimli olan bir yönlendirme protokolunun tasarımı ağın ömür süresinin artmasına katkıda bulunmaktadır. Bu tez çalışmasında, yönlendirme protokollarına ait enerji analizleri esas alınarak, yeni bir bilgi aktarma yönteminin geliştirilmesi amaçlanmıştır. Yine de Kablosuz Sensör Ağları konusunda bir yönlendirme protokolunun tasarlanması ve uygulanması yüksek oranda yapılacak olan uygulamaya bağlı ve buna özel olup çeşitli ortam parametreleri için değiştirilebilmektedir.
Geliştirilen yeni yöntemde protokolun enerji verimliliği tasarım sürecinin asıl karakteristiğini oluştururken bu yöntem çeşitli ağ boyutları için uygulanabilmektedir. Bunun dışında düğüm sayıları ve mesaj uzunluğu gibi aktarma süreci üzerinde etkili olan başka parametreler de simülasyon sürecinde dikkate alınmıştır.
Anahtar Kelimeler: Yönlendirme protokolunun, Enerji açısından, Kablosuz Sensör Ağları, Enerji analizleri.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Wireless Sensor Networks - Energy Consumption
Routing protocols (Computer Network Protocols)
Sensor Networks - Power Supply
Routing Protocols Energy Efficiency Wireless Sensor Networks Energy Analysis
Hybrid Energy Efficient Routing Protocol for Wireless Sensor Networks
Thesis
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http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1849/3/Farazandeh.pdf.txt
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oai:i-rep.emu.edu.tr:11129/18582015-11-19T00:00:19Zhdl_11129_3
EMU I-REP
author
Al-obaidi, Mohammed Khalid Ibraheem
2015-11-18T06:00:49Z
2015-11-18T06:00:49Z
2014-08
Al-Obaidi, Mohammed Khalid Ibraheem. (2014). Rotman Lens Design and Simulation in ISM’s Band. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1858
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
ABSTRACT: Wide coverage area is one of the most important requirements of the antenna applications, such as radar systems or satellite communications. Rotman lens is a low cost beam forming system that provides wide scan angle and it is simple to implement in microstrip model [1]. Rotman lens is a multi-input device which controls the beam scan angle depending on the phase shift corresponding to the path length between the input source positions and the radiator elements. In this study, beside the Rotman lens design and implementation, the conventional matching method (taper line) between the lens region and feeder lines was simulated by FEKO [2] [3]. A new matching method based on the transmission line theory was developed by making use of the standing wave pattern obtained from the FEKO simulation results, to match the feeder line to the lens by considering the lens as a parallel plate region with a given aperture width.
Keywords: Rotman lens, steering beam, phased array antenna.
…………………………………………………………………………………………………………………………
ÖZ: Geniş kapsama alanı, radar veya uydu haberleşme sistemleri gibi anten uygulamalarında çok aranan bir özelliktir. Mikroşerit modele haiz, düşük maliyetli Rotman lens antenler kullanılarak değişik yönlerde hüzme elde edilebilir [1].
Rotman Lens, çok girişli bir yapıya sahip olduğundan, gişiş ve çıkış noktaları arasında dalganın değişik yollar takip etmesinden kaynaklanan faz farkından ötürü, hüzmenin yönü kontrol edilebilir.
Bu çalışmada, literatürdeki Rotman lens tasarımları göz önünde tutulmuş, FEKO benzetim yazılımı uygulanarak, elde edilen sonuçlarların yayınlanan sonuçlarla uyum içerisinde olduğu görülmüştür [2], [3].
Bu çalışmada, 2.45 GHz frekansında çalışan bir Rotman lens tasarımı göz önünde tutulmuş ve Rotman lens ile mikroşerit uyumlaştırması için yöntem geliştirilmiştir.
Paralel iletkenlerden oluşan lens anten ile besleme kablosunu uyumlaştırmak için bir yöntem geliştirilmiştir. Yöntem, FEKO benzetim yazılımı sonuçlarından elde edilen durgun dalda grafiği ve iletim hattı teorisine dayandırılarak geliştirilmiştir.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Lens antennas
Antennas (Electronics)
Rotman lens, steering beam, phased array antenna
Rotman Lens Design and Simulation in ISM’s Band
Thesis
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oai:i-rep.emu.edu.tr:11129/18692015-11-20T00:00:18Zhdl_11129_3
EMU I-REP
author
Al-musaadi, Thaar Abdalraheem Kareem
2015-11-19T07:44:38Z
2015-11-19T07:44:38Z
2014-09
Al-Musaadi, Thaar Abdalraheem Kareem. (2014). A Study on The Determinant Spectrum and Performance of STTC on Slow Fading Channels. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1869
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Hassan Abou Rajab.
ABSTRACT: Wireless communication has faced fading which is one of the major problems. Fading is a result of multipath signals, multi-input multi-output MIMO system is used to minimize the effect of this phenomenon. MIMO is meant to be more than one copy of the same information that is sent by more than one transmitter antenna. Space-Time Trellis Codes (STTCs) are a technique which can be used to enhance the performance of wireless communications systems over fading channels. It is combination of space and time diversity. It provides capacity benefits in fading channels, and helps to improve the reliability and the data rate of wireless communication. Several researchers have undertaken the construction of Space-Time Trellis Codes. The Rank and Determinant Criteria (R&DC) and Euclidean Distance Criteria (EDC) have been developed as design criteria. In this thesis, the effect of determinant spectrum on code design and performance of Space-Time Trellis codes (STTCs) are discussed. Some new 4-state and 8-state 4-PSK and 8-state 8-PSK are constructed as well. The determinant spectrum and the simulation results indicate that the new constructed codes are superior in performance to some existing STTC schemes for a small number of independent subchannels. It is also important to note that many error events and not only the first one are dominating the performance of STTC on a slow fading channel.
Keywords: STTCs, Determinant spectrum, Error event, Distance matrix.
…………………………………………………………………………………………………………………………
ÖZ: kablosuz iletişim önemli sorundan biri olan solma ile karşı gelmiştir. Bu olayın etkisini düşürmek için MIMO sistemi kullanılmıştı MIMO, aynı bilginin birden fazla kopyasının birden fazla verici antenle yollanması anlamına gerlir. STTC, kablosuz iletişimin, solmakta olan kanallar üzerine performansını gelistırmek için kullanılan bir tekniktır. Bu, uzay ve zaman çeşitliğinin kombinasyonudur, solmakta olan kanallarda kapasite faydalar sağlar ve kablosuz iletişimin emniyetini ve veri hızını geliştırır. çesitlı araştırmacılar STTS nin inşaatını üstlenmişlerdir. R&DC ve EDC tasarım krıterleri olarak tasarlanmıştır
Bu tezde, belırleyici spektrumun kod tasarımı üzerindeki etkisi ve STTC nin performansı tartışılmıştır. Bazı yeni 4-state ve 8-state 4-psk ve 8-state 8-psk kurumuştur. Belirleyici spekturum ve simulasyon sonuçları, yeni kurulan kodların, az sayıda bağımısız alt kanal nedeniyle bazı mevcut STTC düzenlerin güre daha üstün performansı olduğ unu belirtir. Birçok hata olayları ve ilk sadece yavaş bir solma kanalda STTC performansını hakim olduğunu da not etmek önemlidir.
Anahtar Kelimeler: STTCs, Determinant spektrum, hata olayı, Uzaklık matrisi.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Wireless Communication
Digital communications
STTCs, Determinant spectrum, Error event, Distance matrix
A Study on The Determinant Spectrum and Performance of STTC on Slow Fading Channels
Thesis
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URL
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MusaadiKareem.pdf.txt
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oai:i-rep.emu.edu.tr:11129/18722015-11-20T00:00:21Zhdl_11129_3
EMU I-REP
author
Salami, Reza
2015-11-19T11:12:55Z
2015-11-19T11:12:55Z
2014-02
Salami, Reza. (2014). Steering Kernel Regression via Laplacian for Image Denoising in Spatial Domain. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/1872
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Prof. Dr. Hüseyin Özkaramanlı.
ABSTRACT: Recently digital imaging devices are used in many applications and they often suffer from some degradation, such as noise, blurring, aliasing effects, and more due to environment limitations. Captured images are mostly not of favorable quality and need to be enhanced by software. One of the significant reasons of the performance degradations for most methods is the presence of noise. Noise removal, therefore, is one of the most important tools for many applications. In this thesis, we focus on this issue as one of the main important problem of image processing. We discuss about the various sources of noise corrupting image and illustrate the statistical behavior of noise and discuss about how to eliminate the effects of the noise from our images. The classic kernel regression (KR) is a statistical framework that enables us to regard a variety of image restoration problems as regression, and it has a few beneficial properties instead of other regression methods. We have modified the classic kernel regression (KR) with steering matrices which are estimated by the singular value decomposition of the second derivatives of pixels that we apply, which makes our method relying not only the spatial properties (the sample location and density), but also the photometric properties of these samples (i.e., pixel value). Thus, the effective size and shape of the regression kernel are adapted locally to the underlying image structure. Steering kernel regression (SKR) method has been shown to provide excellent denoising result. Steering kernels adapt to the local pixel intensity statistics and geometry. SKR employs the gradient for finding the structure of local region by applying the first order structure tensor, but in this work we propose to use an adaptive kernel, which is based on the second derivative of pixels and find the structure tensor of hessian matrix (which related to the second derivative) for each pixel to make the structure tensor more robust in the face of noise to maintain the image details. Since edges in an image have significant profile, we apply second derivative because gradient produces thick edges while second order derivative (Laplacian) produces finer edges also magnitude of gradient can be used to detect presence of edge at point, but sign of second derivative can be used to determine whether edge pixel itself lies on the dark or bright side of edges. The motivation behind structure tensor is a fact that image contains directional structure such as edges and the motivation behind second derivative is to obtain finer edges. Quantitative and perceptual evaluations from simulations have been shown that proposed framework indicates an average PSNR improvement compared to other framework, and compared with the conventional SKR method an average 0.3 dB PSNR increase is obtained. Comparisons show the superiority of this method over other descriptors.
Keywords: Denoising, kernel function, kernel regression, Steering matrix, Taylor series, structure tensor.
…………………………………………………………………………………………………………………………
ÖZ: Görüntü alma aygıtları birçok uygulamada sıkça kullanılmaktadır. Bu aygıtlar aracılığı ile elde edilen gürültü, görüntüler, bulandırma, frekans örtüşmesi ve daha birçok etken tarafından olumsuz yönde etkilenmektedirler. Bu nedenle elde edilen görüntülerin tasarlanacak algoritmalar tarafından iyileştirilmesi gerekmektedir. En önemli olumsuz etken ise, gürültüdür.
Gürültünün temizlenmesi çoğu uygulama için büyük önem arzetmektedir. Bu tezde görüntülerde gürültü temizleme konusu incelenecektir. Görüntüleri kötüleştiren değişik gürültü çeşitleri tartışıldıktan sonra klasik temizleme yöntemleri sunulacaktır.
Istatistiksel bir çerçeve olan klasik çekirdek regresyon birçok görüntü işleme uygulaması için önemli bir enstrümandır. Bu tezde klasik çekirdek regresyon yöntemini yönlü çekirdek regresyon için uyarlanmıştır. Yön matrisleri ikinci türev kullanılarak tekil değer çözümlemesi ile hesaplanmıştır. Önerilen yöntem hem piksellerin hem koordinatlarını hemde şiddetlerini dikkate almaktadır. Bu şekilde regresyon çekirdeği yerel olarak görüntünün yapısına uyarlanmaktadır. Yönlü çekirdek regresyon yönteminin gürültü temizlemede çok başarılı sonuçlar verdiği gösterilmiştir.
Yön çekirdekleri pixel geometri ve değerlerine uyarlanmıştır. Klasik yönlü çekirdek regresyonun birinci türevi kullanmaktadır. Bu çalışmada ise piksellerin ikinci türevi kullanılmış ve Hession matrisi aracılığı ile pikselin yapısal niteliği gürültüye karşı daha sağlam hale getirilmiştir.Bu yöntemle detay bilgiler, kenarlar daha iyi ifade edilmiştir. Kenar bölgelerde birinci türev daha kalın bir profil yaratmakta, ikinci türev ise daha ince bir profil vermektedir. Birinci türevinbüyüklüğü kenar bölgesi olup olmadığını ifade etmektedir. İkinci türevin işareti kenar pikselinin parlak veya koyu bölgede olup olmadığını da vermektedir.
Sayısal kıyaslamalar önerilen yöntemin klasik yönlü çekirdek regresyona kıyasla ortalama 0.3 dB iyileştirme sağladığı yönündedir. Görsel kıyaslamalar da iyileştirmeyi doğrular niteliktedir. Anahtar kelimeler: Gürültünün temizlenmesi, çekirdek regresyon, gergi yapısı, taylor serısi, yönledırme matrısi.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Image Processing, Computer-Assisted
Digital image processing
Denoising, kernel function, kernel regression, Steering matrix, Taylor series, structure tensor
Steering Kernel Regression via Laplacian for Image Denoising in Spatial Domain
Thesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F1872/3/SalamiReza.pdf.txt
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oai:i-rep.emu.edu.tr:11129/20232016-01-21T00:00:19Zhdl_11129_3
EMU I-REP
author
Nkachukwu, Chimbuchi Chioma
2016-01-20T12:22:32Z
2016-01-20T12:22:32Z
2014-08
Nkachukwu, Chimbuchi Chioma . (2014).Short-term Load Forecasting using Neural Network for a Residential Building . Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2023
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2014. Supervisor: Assist. Prof. Dr. Suna Bolat.
As energy consumption rises it becomes important for electric utilities to make adequate plan for this increase to avoid inefficiencies in generation, transmission and distribution of electrical energy. One of the ways of tackling this is to forecast the load for a period of time for proper energy management and utilization. Load forecasting has gained so much popularity over the years however having an accurate load forecast has become a great challenge for researchers as this is very important in power system management.
The aim of this study is to have an idea of energy performance in residential buildings, analyze the historical data to see the trend line of energy consumptions in residential buildings, identify factors that influence the increase in energy use and then employ a short term load forecast using Neural Network (NN) in order to encourage proper utility planning. Factors affecting load consumptions are studied, different short-term load forecasting models are reviewed and a neural network architecture is proposed.
A 1.233% mean absolute percentage error (MAPE) result is obtained by analysing the load data, classifying it into day types, selecting similar days and constructing the neural network architecture. From the results obtained it can be concluded that the tendency of the neural network to forecast load consumption is accurate.…………………………………………………………………………… ÖZ: Enerji tüketimi arttıkça, elektrik kurumlarının bu artış için elektrik enerji üretimi, iletimi ve dağıtımında oluşabilecek yetersizliklerden kaçınmak için gerekli planlamayı yapması önemlidir. Bunu takip edebilmenin bir yolu, uygun enerji yönetimi ve kullanımı için belli bir süre boyunca yük tahmini yapmaktır. Yük tahmini yıllar geçtikçe çok yaygınlaşmıştır ancak güç sistemi yönetiminde önemli yeri olan yük tahminin doğru yapılabilmesi araştırmacılar için zorlu bir görevdir.
Bu çalışmanın amacı, konutlarda enerji performansı ile ilgili bilgi edinmek, konutlarda enerji tüketim trendini önceki verileri çözümleyerek incelemek, enerji artışındaki etmenleri belirlemek ve daha sonra uygun planlamaya teşvik amacıyla Yapay Sinir Ağı kullanarak kısa dönem yük tahmini gerçekleştirmektir. Yük tüketimini etkileyen etmenler araştırılmış, farklı kısa dönem yük tahmini modelleri incelenmiş ve yapay sinir ağı mimarisi sunulmuştur.
Yük verisi incelenerek gün tipleri sınıflandırılmış, benzer günler seçilmiş ve yapay sinir ağı mimarisi oluşturularak, % 1.233 ortalama mutlak yüzde hatalı sonuçlara ulaşılmıştır. Elde edilen sonuçlara göre, yapay sinir ağının yük tahmininde doğru sonuçlar verdiği söylenebilir.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Energy consumption - Residential Buildings
Electric power consumption
Dwellings - Energy consumption
Dwellings - Energy conservation - Sustainable construction
Energy consumption, short-term load forecasting, neural network
Short-term Load Forecasting using Neural Network for a Residential Building
Thesis
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oai:i-rep.emu.edu.tr:11129/20452016-01-27T00:00:12Zhdl_11129_3
EMU I-REP
author
Rezaie, Pouyan
2016-01-26T06:54:36Z
2016-01-26T06:54:36Z
2013
Rezaie, Pouyan. (2013). Performance Estimation of DVB-T under Co-Channel Interference for Deployment of DVB-T in National Border Regions. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2045
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2013. Supervisor: Prof. Dr. Hasan Amca.
In solving the frequency planning problem for Digital Video Broadcasting Terrestrial (DVB-T), it is assumed that all geographical neighboring services interfere with each other. The neighbors then have to agree on the terms of how to dissolve this situation and eliminate the frequency collisions by sacrificing for some of the frequencies. ITU is helping member countries to coordinate each other’s Digital Video Broadcasting services in order to reduce the Co-Channel-Interference (CCI) but it can’t be fully implemented in many parts of the world, especially in the conflict regions. This thesis focuses on the bit error rate analysis for DVB-T systems subject to heavy co-channel interference. The tolerance of DVB-T system with Co-Channel-Interference (CCI) in AWGN and Rician fading channels has been investigated. The four scenarios presented in this thesis are as follow: 1-the evaluation of BER for DVB-T system consideration with AWGN channel and the DVB-T system with Rician channel. 2- The evaluation BER of DVB-T system after adding co-channel interference. 3- Comparing the BER with CCI and without CCI. 4- Determine tolerance of DVB-T system with different channels when the various levels of co-channel interference happen. The BER of the system has been checked in low, normal and high SNR by MATLAB simulation and it is expected that the system works properly in normal SNR but the CCI prevents this. The system worked properly while SNR is increased. The DVB-T system with AWGN channel has less BER than the system with Rician. One of the important parts of this thesis is related to tolerance of the system while encountering with the different levels of co-channel interference. As it is expected, the system with AWGN channel can
iv
tolerate the heavy CCI but the system with Rician can handle it when S/CCI=20dB (signal to co-channel interference). In this case increasing the SNR was not useful. As a result, the OFDM and AWGN and Rician channels are employed plus RS encoder for correcting the errors.Keywords: Digital Video Broadcasting, OFDM, AWGN Channel, Rician Fading Channel, Co-Channel Interference…………………………………………………………………………… ÖZ: Karasal Dijital Video Yayını için, frekans planlanlama problemlerinin çözümünde, bütün coğrafik komşu servisler birbirleri ile girişim halinde oldukları kabul edilmiştir. Komşu servisler bu durumun nasıl çözüleceği konusunda hemfikir olmak zorundadır ve bazı frekansları feda ederek frekans çarpışmaları elimine edilmiştir. Yardımcı kanal girişimlerini azaltmak için, ITU üye ülkelererin, birbirleri ile Karasal Dijital Video Yayını konusunda koordine olmaları konusunda yardımcı olmaktadır. Fakat dünyanın bir çok kısmında uygulanamamaktadır. Özellikle engebeli bölgelerde. Bu araştırmanın odak nokası Karasal Dijital Video Yayını sistemlerinde ağırlıklı olarak yardımcı kanal elde etmek için kullanılan BER ve SNR’dır.Karasal Dijital Video Yayını sistemlerinin töleransı ile AWGN ve Rician zayıflama kanallarındaki yardımcı kanal girişimleri araştırılmıştır. Bu tezde bulunan dört senaryo şu şekilde sıralanmıştır; 1- Karasal Dijital Video Yayın sistemi ile AWGN kanal ve Karasal Dijital Video Yayın sistemi ile Rician kanallarının BER değerlendirmeleri yapılmıştır. 2-Yardımcı kanal girişimlerini ekledikten sonraki sistemlerin BER’i değerlendirilmiştir. 3-Yardımcı kanal girişimli ve yardımcı kanal girişimsiz olarak BER’ler karşılaştırılmıştır. 4-çeşitli seviyelerdeki yardımcı kanalların girişim yaptıkları zaman, Karasal Dijital Video Yayın sistemlerindeki farklı kanalların tolerelerinin tanımlanması . BER sistemleri düşük, Normal ve yüksek SNR’ları matlab simulasyonları ile kontrol edildi ve sistemin SNRda düzenli bir şekilde çalışacağı beklenirdi fakat yardımcı kanal girişimi bunu korudu.SNR arttığı zaman sistem düzenli olarak çalışmştır.AWGN kanal ile çalışan Karasal Dijital Video Yayın sistemleri Rician ile çalışandan daha az BERe sahiptir. Bu tezdaki en
önemli kısımlardan biri, farklı seviyelerdeki yardımcı kalan girişimlerinin birbirleri ile karşılaştıklarındaki toleranslardı.Beklenildiği gibi AWGN kanalı ağırlıklı yardımcı kanal girişiminde toleranslı olabilmektedir, fakat Rician ile olan sistemlerde sadece normal yardımcı kanal girişimi işlenmiştir.Bu durumda SNR’ı arttırmak faydalı olmayacaktır.Sonuç olarak OFDM, AWGN ve Rician kanalları ve buna ek olarak hataları düzeltmek için RS kodlayıcılar kullanıldı.
Anahtar Kelimeler: Dijital Video Yayını, OFDM, AWGN Kanal, Rician Solma Kanal, Co-Kanal Girişim.
en
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
Electrical and Electronic Engineering
Image transmission - Image processing
Multimedia communications - Image processing - Wireless communication systems
Digital Video Broadcasting, OFDM, AWGN Channel, Rician Fading Channel, Co-Channel Interference
Performance Estimation of DVB-T under Co-Channel Interference for Deployment of DVB-T in National Border Regions
Thesis
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RezaeiPouyan.pdf.txt
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oai:i-rep.emu.edu.tr:11129/20532016-02-04T00:00:21Zhdl_11129_390
EMU I-REP
author
Hasan, Amca
author
Huseyin, Aşık
2016-02-03T07:28:12Z
2016-02-03T07:28:12Z
2013-09
Hasan Amca, Huseyin Aşık, 9-11 Eylul 2013,"Ekonomi, Fonksiyon ve Sağlık Açısından Optimum Mobil İletişim Sistemi Tasarım"2. Ulusal EMC Konferansı, Işık Universitesi/ Türkiye
http://hdl.handle.net/11129/2053
Bu araştırma, Baz-İstasyonlarından ve özelde Cep-Telefonları genelde de Mobil İletişim Cihazlarından yayılan elektromanyetik alanların kanser ile ilişkisinin incelenmesi ve olası olumsuz etkilerinin azaltılması konusunda yapılacak önerilerden oluşmaktadır. Yapılan birçok çalışma birbirleri ile çelişmesine rağmen, Dünya Sağlık Örgütü, elektromanyetik alanlar insan sağlığı açısından “bir ihtimal kanserojendir” ibaresini kullanarak kanser açısından 2B gurubuna dahil etmiştir [1]. ICNIRP’nin yayınladığı Baz-İstasyonlarından ve Cep-Telefonlarından kaynaklanan elektromanyetik alanların insan sağlığını etkilediği sınır değerleri hala tartışılmaktadır [2]. Burada esas olarak Baz-İstasyonlarının ve Cep-Telefonlarının mümkün olan en düşük güç seviyesinde çalışabilmesi için Baz-İstasyonlarının yerleşkesinin önemi üzerinde durulmuştur. Yerleşke tasarımı yapılırken halkın sağlığıyla ilgili endişeleri ve servis sağlayıcılarının ekonomi ve fonksiyon açısından hassasiyetleri de dikkate alınmıştır.
other
2. Ulusal EMC Konferansı, Işık Universitesi/ Türkiye
Baz İstasyonları
Cep Telefonları
Mobil İletişim Cihazları
elektromanyetik alanlar
elektromanyetik alanların - kanserle ilişkisi
Gazimağusa Şehri - İdeal Baz İstasyonu
Ekonomi, Fonksiyon ve Sağlık Açısından Optimum Mobil İletişim Sistemi Tasarım
Article
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Ekonomi Fonksiyon ve Sağlık Açısından Optimum Mobil İletişim Sistemi Tasarımı.pdf.txt
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oai:i-rep.emu.edu.tr:11129/20542016-02-04T00:00:15Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Amca, Hasan
author
İlkan, Mustafa
author
Alicik, Şensev
author
Çırak, Yeşim Kapsıl
2016-02-03T09:22:30Z
2016-02-03T09:22:30Z
2008
Hasan Amca, Mustafa İlkan, Şensev Alicik, Yeşim Kapsıl Çırak,(2008) "Endüstriden Sağlanan Gerçek Hayat Problemleri ile Bilişim Öğrencilerinin Mezuniyetten Önce Endüstriye Adaptasyonlarının Sağlanması, Bilişim Mezunlarından Beklentiler " Mesleki Eğitim Sempozyumu.
http://hdl.handle.net/11129/2054
Uygulanmakta olan geleneksel bilişim teknolojileri eğitim modelleri endüstrinin beklentilerini karşılamaktan çok uzakta olup yeni bir anlayış getirilmesi kaçınılmazdır. Gerçek hayat problemlerini temel alan proje uygulamalarını eğitim hayatına katmadığımız sürece genelde mesleki eğitimde, özelde de bilişim eğitiminde endüstri ile gerçek bir bütünleşme sağlanamaz. Olayları öğrenme ve hatırlama üzerine kurulan geleneksel eğitim modelleri endüstri ile ilişkilerin geliştirilmesinde oldukça zayıf kalmaktadır. Uygun projelerin seçimi ile eğitim modelini proje tabanlı bir sisteme oturtmak endüstri ile entegrasyonun temelidir. Bu makale, proje tabanlı öğrenim (PTÖ) modeli çerçevesinde bilişim uzmanı yetiştirmede önemli işlevi olacak bir müfredat geliştirilmesi üzerine bir model geliştirmektedir. Bu makale endüstri-üniversite işbirliğini de cesaretlendirmek için önerilmektedir.
other
Bilgisayar ve Teknoloji Yüksek Okulu - Doğu Akdeniz Üniversitesi/KKTC
Endüstriyel Staj
Proje Tabanlı Öğrenim (PTÖ),
Eğitim Politikası
Müfredat
Mezuniyet Projesi
Endüstriden Sağlanan Gerçek Hayat Problemleri ile Bilişim Öğrencilerinin Mezuniyetten Önce Endüstriye Adaptasyonlarının Sağlanması, Bilişim Mezunlarından Beklentiler
Article
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URL
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Endüstriden Sağlanan Gerçek Hayat Problemleri ile Bilişim Öğrencilerinin Mezuniyetten Önce Endüstriye Adaptasyonlarının Sağlanması.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2054/1/End%C3%BCstriden+Sa%C4%9Flanan+Ger%C3%A7ek+Hayat+Problemleri+ile+Bili%C5%9Fim+%C3%96%C4%9Frencilerinin+Mezuniyetten+%C3%96nce+End%C3%BCstriye+Adaptasyonlar%C4%B1n%C4%B1n+Sa%C4%9Flanmas%C4%B1.pdf
File
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Endüstriden Sağlanan Gerçek Hayat Problemleri ile Bilişim Öğrencilerinin Mezuniyetten Önce Endüstriye Adaptasyonlarının Sağlanması.pdf
oai:i-rep.emu.edu.tr:11129/20562016-02-04T00:00:16Zhdl_11129_390
EMU I-REP
author
Çelebi, Erbuğ
author
Amca, Hasan
2016-02-03T16:20:28Z
2016-02-03T16:20:28Z
2008-05
Erbuğ Çelebi, Hasan Amca, 16-18 Mayıs 2008, "Mobil Telefonların Mikro-Ödeme Aracı Olarak Kullanılması"Ağ ve Bilgi Güvenliği Ulusal Sempozyumu 2 ABG '08.
http://hdl.handle.net/11129/2056
Today, using different technologies for electronic-payment in retail market carries some issues in the mean of security and usability. The use of portable communication devices became particularly attractive candidates when versatility, security and simplicity features of payment technologies are considered.
In this paper, we investigate the use of mobile communication devices as versatile, secure and simple micro-payment tool, which satisfy the related financial, technological, computational and managerial requirements. The versatility and security of the method comes from the use of mobile telephone with a Variable Transaction Number in each transaction. Experimental results show that, the systematic requirements for the implementation of this technology are minimal and the costs involved are very much reasonable.
other
Ağ ve Bilgi Güvenliği Ulusal Sempozyumu 2 ABG '08, Girne / KKTC
info:eu-repo/semantics/openAccess
kart tabanlı elektronik ödeme yöntemleri
elektronik ödeme araçları
cep telefonu uygulamaları
industrial devices - mobile phone application
secure payment
Mobil Telefonların Mikro-Ödeme Aracı Olarak Kullanılması
Article
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URL
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CepTelefonlarinin_Micro-odemearaciolarakKullanilmasi_formated.pdf.txt
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oai:i-rep.emu.edu.tr:11129/20572016-02-04T00:00:21Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Çelebi, Erbuğ
2016-02-03T16:26:04Z
2016-02-03T16:26:04Z
2007-12
Hasan Amca, Erbuğ Çelebi, 3-12 December 2007,"Mobile Telephone As An Operator Independent, Secure Micro-Payment Tool"CISSE2007, International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering.
http://hdl.handle.net/11129/2057
With the latest advances in Information and Communication Technologies (ICT), using different technologies for electronic-payment has become a major issue in the retail market. The use of portable communication devices became particularly attractive candidates when versatility, security and simplicity considerations of payment technologies are considered.
In this paper, we investigate the use of mobile communication devices as versatile, secure and simple micro-payment tools, which satisfy the related financial,
technological, computational and managerial requirements.The versatility and security of the method comes from the use of a mobile telephone and a Variable Transaction Number
(VTN) in each transaction. Experimental results have shown that, the systematic requirements for the implementation of
this technology are minimal and the costs involved are very much reasonable.
en
CISSE2007, International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering, California/USA
info:eu-repo/semantics/openAccess
Payment
secure payment
industrial devices
mobile phone application
Mobile Telephone As An Operator Independent, Secure Micro-Payment Tool
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2057/3/Mobile+Telephone+as+a+Secure+Micro-Payment+Tool.pdf.txt
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Mobile Telephone as a Secure Micro-Payment Tool.pdf.txt
URL
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Mobile Telephone as a Secure Micro-Payment Tool.pdf
oai:i-rep.emu.edu.tr:11129/20612016-02-04T13:35:47Zhdl_11129_1949hdl_11129_1952hdl_11129_817
EMU I-REP
author
Rızaner, Ahmet
author
Ulusoy, Ali Hakan
author
Amca, Hasan
author
Hacıoğlu, Kadri
2016-02-04T13:32:07Z
2016-02-04T13:32:07Z
2011-11
Ahmet Rızaner, Ali Hakan Ulusoy, Hasan Amca, Kadri Hacıoğlu (2011) "An adaptive least squares channel estimation based on conjugate gradient approach for multipath fading CDMA systems" Computers & Electrical Engineering Volume 37, Issue 6, Pages 1082–1089 .
0045-7906
DOI: 10.1016/j.compeleceng.2011.07.003Ş
http://dx.doi.org/doi:10.1016/j.compeleceng.2011.07.003
http://hdl.handle.net/11129/2061
Du to copyright restirctions,the access to teh publisher version (publishe version)of this article is only available via subscription. You may clik URI (with DOI:10.1016/j.compeleceng.2011.07.003)and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.
Publisher Version (Published Version).
Multiple access interference (MAI) is the main factor affecting the performance of channel estimation techniques for code division multiple access (CDMA) systems. Although, several multi-user channel estimation algorithms have been proposed to mitigate MAI, these algorithms require high computational complexities. In this paper, we address the problem of iterative least squares (LS) mobile channel estimation at high channel efficiency that requires a short training sequence along with the spreading sequences. We employ an efficient iterative method based on conjugate gradient (CG) algorithm to reduce the computational complexity of the estimation method. Computer simulations illustrate that the proposed method performs almost identical to the exact LS estimate for reasonable training lengths.
en
Computers & Electrical Engineering, Elsevier
info:eu-repo/semantics/closedAccess
multiple access interference
channel estimation techniques
mobile channel estimation
power updates in wireless CDMA systems
An adaptive least squares channel estimation based on conjugate gradient approach for multipath fading CDMA systems
Article
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oai:i-rep.emu.edu.tr:11129/20642016-02-05T00:00:10Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Kansoy, Raygan
2016-02-04T14:00:25Z
2016-02-04T14:00:25Z
2007-08
Hasan Amca, Raygan Kansoy, (22-24 Aug. 2007)" A Mobile Telephone Based, Secure Micro-Payment Technology Using The Existing ICT Infrastructure"Chinacom 2007: International Conference On Communications And Networking.
http://hdl.handle.net/11129/2064
The need to use mobile telephones and PDA’s as electronic-payment devices became stronger as the global mobile penetration rate reached 17 percent. However, due to
the technological limitations and security considerations, the
well established jargon of electronic-payment could not be employed in mobile-payment (m-payment), specifically for payment of very low amounts (e.g. micro-payment). Therefore, new technologies are needed for enabling m-payment. In this paper, we investigate the shortcomings of the available card-based micro-payment schemes and propose a new scheme that is suitable to apply to multiple-vendors for
m-payment. The proposed scheme uses a Variable Transaction Number (VTN) used per purchase,in the form of an on-screen barcode, readable by the CCD barcode scanners. The proposed method satisfies requirements of micro-payment systems in terms of financial, hnological,computational and managerial costs.
en
Chinacom 2007: International Conference On Communications And Networking / Shangai,China
Using credit cards
Preview Online Payment Processing (OPP)
global mobile equipment penetration
mobile-payment or m-payment
E-Charge - My-Phone Using SMS method
consumers in different applications
computational and managerial costs.
A Mobile Telephone Based, Secure Micro-Payment Technology Using The Existing ICT Infrastructure
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2064/3/A+Mobile+Telephone+Based+Secure+Micro-Payment+Technology+Using+the+Existing+ICT+Infrastructure+2.pdf.txt
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text/plain
A Mobile Telephone Based Secure Micro-Payment Technology Using the Existing ICT Infrastructure 2.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2064/1/A+Mobile+Telephone+Based+Secure+Micro-Payment+Technology+Using+the+Existing+ICT+Infrastructure+2.pdf
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A Mobile Telephone Based Secure Micro-Payment Technology Using the Existing ICT Infrastructure 2.pdf
oai:i-rep.emu.edu.tr:11129/20632016-02-05T00:00:26Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Rızaner, Ahmet
author
Amca, Hasan
author
Hacıoğlu, Kadri
author
Ulusoy, Ali Hakan
author
Scherb, Ansgar
2016-02-04T13:50:06Z
2016-02-04T13:50:06Z
2006-07
Ahmet Rızaner, Hasan Amca, Kadri Hacıoğlu, Ali H. Ulusoy, Ansgar Scherb, (29-31 Jul 2006) "An Adaptive Near-far Resistant Single-user Channel Estimation Algorithm for Multipath Fading DS-CDMA Systems "İnternational Conference on Wireless and Mobile Communications.
http://hdl.handle.net/11129/2063
Channel estimation techniques for CDMA systems need
to combat multiple access interference and near-far
effects to improve the estimation performance. Linear
single-user MMSE detector has certain advantages with
respect to near-far problem. In this paper, single-user
MMSE detector is used to develop an iterative near-far
resistant radio channel estimation algorithm. Computer
simulation results demonstrate that a significant
performance improvement against conventional singleuser
estimator can be achieved with the developed
method especially under extreme near-far conditions.
en
İnternational Conference on Wireless and Mobile Communications/Bucharest, Romania.
info:eu-repo/semantics/openAccess
Channel estimation techniques
multipath fading channel parameters
Linear singl -user MMSE
radio channel estimation algorithm
near-far resistant channel estimation
An Adaptive Near-far Resistant Single-user Channel Estimation Algorithm for Multipath Fading DS-CDMA Systems
Article
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URL
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An Adaptive Near-far Resistant Single-user Channel Estimation.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2063/1/An+Adaptive+Near-far+Resistant+Single-user+Channel+Estimation.pdf
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An Adaptive Near-far Resistant Single-user Channel Estimation.pdf
oai:i-rep.emu.edu.tr:11129/20622016-02-05T00:00:16Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Rızaner, Ahmet
author
Amca, Hasan
author
Hacıoğlu, Kadri
author
Ulusoy, Ali Hakan
2016-02-04T13:45:20Z
2016-02-04T13:45:20Z
2006-02
Ahmet Rizaner, Hasan Amca, Kadri Hacıoğlu, Ali H. Ulusoy , (19-25 Feb 2006) "Iterative Least Squares Channel Estimation in CDMA Systems" International Conference on Internet and Web Applications and Services /Advanced International Conference(AICT- ICIW) ,on vol. 00, pp.86-86
ISBN 0-7695-2522-9
http://dblp.uni-trier.de/db/conf/aict/aict2006.html
http://hdl.handle.net/11129/2062
Multiple access interference (MAI) is the main factor
affecting the performance of channel estimation
techniques for code division multiple access (CDMA)
systems. Although, several multi-user channel estimation
algorithms have been proposed to mitigate MAI, these
algorithms require high computational complexities. In
this paper, we address the problem of least squares (LS)
mobile channel estimation at high channel efficiency that
requires a short training sequence along with the
spreading sequences. Then, we employ an efficient
iterative method based on conjugate gradient (CG)
algorithm to reduce the computational complexity of the
estimation method. Computer simulations illustrate that
the proposed method performs almost identical to the
exact LS estimate for reasonable training lengths.
en
International Conference on Internet and Web Applications and Services /Advanced International Conference(AICT- ICIW) /France
info:eu-repo/semantics/openAccess
Multiple access interference (MAI)
multi-user channel estimation
efficient iterative method based on conjugate gradient (CG)
mobile channel estimation
Iterative Least Squares Channel Estimation in CDMA Systems
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2062/3/Iterative+Least+Squares+Channel+Estimation+in+Frequency+Selective+CDMA+Systems.pdf.txt
File
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Iterative Least Squares Channel Estimation in Frequency Selective CDMA Systems.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2062/1/Iterative+Least+Squares+Channel+Estimation+in+Frequency+Selective+CDMA+Systems.pdf
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Iterative Least Squares Channel Estimation in Frequency Selective CDMA Systems.pdf
oai:i-rep.emu.edu.tr:11129/20812016-02-06T00:00:18Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Jönsson, Anders
2016-02-05T11:54:42Z
2016-02-05T11:54:42Z
2005-07
Hasan Amca, Anders Jönsson, (26-27 July 2005) "E-COMMERCE: How Can Businesses Benefit From E-Commerce?"International Conference on Contemporary issues in Information Technology in OIC Member States.
http://hdl.handle.net/11129/2081
E-business in general and e-commerce in particular is changing the way people do business and sell
their product and services to the entire world without the need of physically existing around the
globe. As enterprises exploit business opportunities via the Internet, they have discovered that not
only they need a reliable and scalable IT infrastructure to support their online business, but also
they must have the capability to deploy new online applications rapidly and integrate e-commerce
to their already existing business model.
The paper concentrates on the description of e-commerce, how businesses transform to
e-commerce and the technical details about the necessary IT infrastructure, business model for the
transformation, payment schemes and success factors.
en
International Conference on Contemporary Issues in Information Technology in OIC Member States /Islamabad, Pakistan.
info:eu-repo/semantics/openAccess
Internet and other commercial networks
E-business
E-commerce
E-Commerce Technologies
sectors suitable for e-commerce
e-commerce laws
E-COMMERCE: How Can Businesses Benefit From E-Commerce?
Article
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E-COMMERCE HOW CAN BUSINESS.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2081/1/E-COMMERCE+HOW+CAN+BUSINESS.pdf
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oai:i-rep.emu.edu.tr:11129/20822016-02-06T00:00:35Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Elci, Alev
2016-02-05T11:56:40Z
2016-02-05T11:56:40Z
2005-03
Hasan Amca, Alev Elci, (March 2005) "A Multidisciplinary Education Framework to Adopt IT Undergraduates in non-IT Disciplines"Cyprus Academic Forum, 1st All Cyprus Social Sciences and Humanities Conference.
http://hdl.handle.net/11129/2082
Computing and Information Technology (IT) skills became
more and more desirable for many non-IT disciplines such as,
Communication and Media Studies, Education, and Economy.
Therefore, a new multidisciplinary education framework is
required, in which the students IT skills will be developed
along with the soft skills before they are transferred to the
education environment to develop their professional skills.
This is due to the need to satisfy the industries requirements.
We propose an effective and economically feasible educational
framework where the graduates from the Information
Technology departments, fully proficient in data collection,
processing and management besides system analysis skills,
would continue their graduate/postgraduate education in non-
IT disciplines. Such students will have completed, without
wasting any time, the deficiency programs through the use of
free-elective courses which are already available in their
curricula.
en
Cyprus Academic Forum, 1st All Cyprus Social Sciences and Humanities Conference / Nicosia , Cyprus.
info:eu-repo/semantics/openAccess
Computing and Information Technology
non-IT disciplines
multidisciplinary education framework
transdisciplinary education
system analysis skills
graduate/postgraduate education in non- IT disciplines
A Multidisciplinary Education Framework to Adopt IT Undergraduates in non-IT Disciplines
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2082/3/Copy+of+A+Multidisciplinary+Education+Framework+to+Adopt+IT+Undergraduates+in+non-IT+Disciplines.pdf.txt
File
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28961
text/plain
Copy of A Multidisciplinary Education Framework to Adopt IT Undergraduates in non-IT Disciplines.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2082/1/Copy+of+A+Multidisciplinary+Education+Framework+to+Adopt+IT+Undergraduates+in+non-IT+Disciplines.pdf
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application/pdf
Copy of A Multidisciplinary Education Framework to Adopt IT Undergraduates in non-IT Disciplines.pdf
oai:i-rep.emu.edu.tr:11129/20802016-02-06T00:00:34Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Ulusoy, Ali Hakan
author
Rızaner, Ahmet
author
Hacıoğlu, Kadri
author
Amca, Hasan
2016-02-05T11:52:12Z
2016-02-05T11:52:12Z
2002-02
Ali Hakan Ulusoy, Ahmet Rızaner, Kadri Hacıoğlu, Hasan Amca,"Performance Analysis of The Path Selective Decorrelating Detector with a Maximum Likelihood Channel Estimator", European Wireless 2002, (EW2002).
http://hdl.handle.net/11129/2080
The adaptive path selective decorrelating detector requires the knowledge of the channel coefficients for path selection to reduce both system complexity and noise enhancement. Generally, the
channel coefficients are assumed to be known at the receiver. However, this is not realistic. Therefore, we propose a maximum-likelihood channel estimation method that makes use of both known spreading sequences and short training sequences for the estimation of channel coefficients. We derive an expression for the Mean Square Error (MSE) of the channel estimate and extend the semi-analytic Bit Error Rate
(BER) analysis of the path selective receiver to include estimation errors. Results show that with a fairly
short training sequence (8-16 bits) the system performs very close to the known channel case.
en
European Wireless 2002,( EW2002),/ Florence-Italy
info:eu-repo/semantics/openAccess
CDMA based systems
computationally demanding
significant factors
Multipath-Decorrelating Detector
noise enhancement
system complexity
Performance Analysis of The Path Selective Decorrelating Detector with a Maximum Likelihood Channel Estimator
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2080/3/Copy+of+Performance+Analysis+of+The+Path+Selective+Decorrelating+Detector.pdf.txt
File
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text/plain
Copy of Performance Analysis of The Path Selective Decorrelating Detector.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2080/1/Copy+of+Performance+Analysis+of+The+Path+Selective+Decorrelating+Detector.pdf
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Copy of Performance Analysis of The Path Selective Decorrelating Detector.pdf
oai:i-rep.emu.edu.tr:11129/21092016-02-10T00:00:31Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Rızaner, Ahmet
author
Hacıoğlu, Kadri
author
Amca, Hasan
author
Ulusoy, Ali Hakan
2016-02-09T04:38:19Z
2016-02-09T04:38:19Z
2001-10
Ahmet Rızaner, Kadri Hacıoğlu, Hasan Amca, Ali Hakan Ulusoy, (15-18 Oct. 2001),"Signature Waveform Estimation By Using Short Training Sequences", nternational Conference on Information, Communications and Signal Processing (ICIC2001).
http://hdl.handle.net/11129/2109
Multiuser detection techniques are known to be effective
strategies to counter the presence of multiuser
interference in code division multiple access channels.
Generally, multiuser detectors can provide excellent
performance only when the signature waveforms1 of all
users are precisely known. Hence, the estimation of
signature waveforms is a challenging issue in mobile
communication systems. In this paper, we compare the
performance of two training based estimators of using
short training sequences. One is maximum likelihood
type signature waveform estimator that requires the
knowledge of spreading sequences and training
sequences. The other estimator is based on subspace
method and requires the knowledge of training sequences
only. Through the simulations, we show the signature
waveform estimation performance of both systems and
the effect of the estimation error on the performance of a
multiuser detector. The complexity comparisons of both
systems are also given.
en
International Conference on Information, Communications and Signal Processing (ICIC2001),/Singapore
multiuser detection techniques
code division multiple access channels
signature waveforms
using short training sequences
future mobile radio systems
Maximum Likelihood (ML) channel estimation method
Signature Waveform Estimation By Using Short Training Sequences
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2109/3/Copy+of+Signature+Waveform+Estimation+By+Using+Short+Training+Sequences.pdf.txt
File
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text/plain
Copy of Signature Waveform Estimation By Using Short Training Sequences.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2109/1/Copy+of+Signature+Waveform+Estimation+By+Using+Short+Training+Sequences.pdf
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Copy of Signature Waveform Estimation By Using Short Training Sequences.pdf
oai:i-rep.emu.edu.tr:11129/20872016-02-06T00:00:40Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Amca, Hasan
author
İlkan, Mustafa
author
Varoğlu, Ekrem
author
Yağlı, Cem
2016-02-05T17:15:15Z
2016-02-05T17:15:15Z
2002-09
Hasan Amca, Mustafa İlkan, Ekrem Varoğlu, Cem Yağlı (2002) "Online Tourism Promotion in the TRNC ", EMU Tourizm Congress
http://hdl.handle.net/11129/2087
The paper discusses the effect of web usage on businesses with emphasis on tourism promotion. A detailed solution method is proposed for connecting the small tourism facilities in the TRNC to the Internet, which, can not built their on-line Internet infrastructure. The role of individual customers, companies and the government offices in realizing this project is well explained. The possible mutual benefits of such an implementation, is outlined.
en
EMU Tourizm Congress, Famagusta,/ North Cyprus
e-tourism
tourism information system,
web usage
Online Tourism Promotion in the TRNC
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2087/3/Copy+of+Online+Tourism+Promotion+in+the+TRNC.pdf.txt
File
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Copy of Online Tourism Promotion in the TRNC.pdf.txt
URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2087/1/Copy+of+Online+Tourism+Promotion+in+the+TRNC.pdf
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Copy of Online Tourism Promotion in the TRNC.pdf
oai:i-rep.emu.edu.tr:11129/21102016-02-10T00:00:32Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Bilgekul, Hüseyin
2016-02-09T04:59:11Z
2016-02-09T04:59:11Z
1995-09
Hasan Amca, Hüseyin Bilgekul, (11-17 Eylül 1995), "Oda İçi, Milimetre Dalga Boyu, Taşınabilir İletişim Sistemlerinin Karşılaştırılması Ve İyileştirme Yöntemlerine Karşı Davranışları ", Elektirik Mühendisliği 6.Ulusal Kongresi
http://hdl.handle.net/11129/2110
Bu makalede, bina-içi milimetre dalga boylu,
taşınabilir iletişim sistemlerinin (TİS) çeşitleme ve
denkleştirme yöntemleriyle elde edilebilecek potansiyel
başarımları araştırılmıştır. Başarımları karşılaştırılan
kipleme yöntemleri; ikili ve dörtlü evre
kaydırmalı anahtarlama’nın (BPSK, QPSK) uyumlu
(coherent) türleri (CBPSK ve CQPSK) ile uyumsuz
(incoherent) minimum kaydırmalı anahtarlama
(IMSK) ve Gauss süzgeçlenmiş IMSK (IGMSK)-
’dir. CQPSK’nın, CBPSK, IMSK ve IGMSK’dan
daha iyi başarım gösterdiği gözlamlenmiştir fakat
yine de bu sistemlerin hiç birisi sayısal sebekelere
kablosuz bağlantı sağlıyacak 10Mb/s veri hızında
gerekli başarımı gösteremediler. Bu veri hızına
ulaşabilmek için uygulanan iyileştirme yöntemlerinden
uyarlanabilir denkleştiriciler pek fazla yarar
sağlamadılar. Başarımda kayda değer iyileştirme
sadece frekans çeşitleme yöntemiyle elde edilmiştir.
other
Elektirik Mühendisliği 6.Ulusal Kongresi, Bursa/ Türkiye
bina-içi milimetre dalga boylu
taşınabilir iletişim sistemleri
frekans çeşitleme yöntemleri
çokyollu bayılabilen Rayleigh kanal modeli
Oda İçi, Milimetre Dalga Boyu, Taşınabilir İletişim Sistemlerinin Karşılaştırılması Ve İyileştirme Yöntemlerine Karşı Davranışları
Article
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2110/1/Copy+of+ODA+%C4%B0%C3%87%C4%B0%2C+M%C4%B0L%C4%B0METRE+DALGA+BOYU%2C+TA%C5%9EINAB%C4%B0L%C4%B0R+%C4%B0LET%C4%B0%C5%9E%C4%B0M+S%C4%B0S-TEMLER%C4%B0N%C4%B0N+KAR%C5%9EILA%C5%9ETIRILMASI+.pdf
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Copy of ODA İÇİ, MİLİMETRE DALGA BOYU, TAŞINABİLİR İLETİŞİM SİS-TEMLERİNİN KARŞILAŞTIRILMASI .pdf
oai:i-rep.emu.edu.tr:11129/21072016-02-10T00:00:12Zhdl_11129_390
EMU I-REP
author
Hacıoğlu, Kadri
author
Amca, Hasan
2016-02-09T04:29:38Z
2016-02-09T04:29:38Z
1999-06
Kadri Hacıoğlu, Hasan Amca (15-18 june 1999),"A Soft Decision Feedback Equalizer"International Conference on Telecommunications.
http://hdl.handle.net/11129/2107
In this paper, a method to reduce the error prop-agation in Decision Feedback Equalizers (DFEs) is addressed. An M-level staircase nonlinearity is pro-posed for the feedback chain of the DFE.
Analytical results are presented to show advantages
obtained with increasing M. Finally, the saturation
nonlinearity (the limiting case as M tends to in nity)
is suggested for the DFE. Simulations are provided to support the proposed DFE. Its performance is found to be better than that of the recently proposed Era-sure DFE.
en
International Conference on Telecommunications, Cheju/ Korea.
communications systems
feedback equalizer
simulations
subsequent decisions
A Soft Decision Feedback Equalizer
Article
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oai:i-rep.emu.edu.tr:11129/21082016-02-10T00:00:31Zhdl_11129_390
EMU I-REP
author
Amca, Hasan
author
Yenal, Tolga
author
Hacıoğlu, Kadri
2016-02-09T04:32:59Z
2016-02-09T04:32:59Z
1998-06
Hasan Amca, Tolga Yenal, Kadri Hacıoğlu, (1998)," A Sample Diversity Decision-Feedback-Equalisation For Multipath Channels "ICT 98.
http://hdl.handle.net/11129/2108
A new Decision-Feedback-Equalisation (DFE)
technique is introduced, namely, the Sample-Diversity (SD) DFE. To realise a sample-diversity at the DFE input,N samples are taken from each symbol and these samples are used to drive N different DFE’s. A simple selection
mechanism is introduced to select the best sampling phase and DFE to be used in the tracking mode. Through simulations, for normalized-rms-delay-spread over the
range from 0.01 to 1, the SDDFE is shown to have a much better performance than a conventional DFE. Being a combination of diversity and equalisation techniques,
the SD approach is shown as a promising technique for
symbol detection in multipath fading channels.
en
ICT 98,/ Athens.
decision - feedback- equalisation
sample - diversity
symbol detection in multipath fading channels
multipath channels
A Sample Diversity Decision-Feedback-Equalisation For Multipath Channels
Article
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oai:i-rep.emu.edu.tr:11129/21122016-02-17T00:00:42Zhdl_11129_389
EMU I-REP
author
Ay, Gokhan
author
Doğanalp, Neşet
author
Elbousiffi, Ans Mohamed
2016-02-16T08:54:56Z
2016-02-16T08:54:56Z
2015-06
Gökhan Ay, Neşat Doğanalp, Ans Mohamed A Elbousiffi, (2015),"Exploring Mobile/WiFi Handover with Multipath TCP "Eastern Mediterranean University, Electrical and Electronic Engineering Department.
http://hdl.handle.net/11129/2112
Undergraduate Project Report
submitted in partial fulfillment of
the requirements for the
degree of Bachelor of Science (B.S.)
in Electrical and Electronic Engineering Department Eastern Mediterranean University June 2015.Supervisor:Prof. Dr. Hasan AMCA
The everlasting fact that data traffic always increases due to the expanding number of subscribers. Users always want to have a fast and reliable network speeds. As this growth in demand led data traffic to increase, operators started dedicating their work on some new and efficient ways that is different from 3G or 4G networks,one idea has been considered here offloading to Wi-Fi. Multipath TCP (MPTCP) which is an evolution of TCP that allows the simultaneous use of multiple interfaces for a single connection while standard TCP is kept the same for socket API to application. Multipath TCP allows to smooth handover from WiFi to 3G back and forth.In our experiment,we observe the workability of MPTCP over real WiFi / 3G or 4G networks and use our linux kernel implementation of Multipath TCP that results in smooth handover without lose of data.We observe that Multipath TCP energy consumption and performance depends on the modes of the kernel by performing perfect results in applications such as VoIP.
en
Eastern Mediterranean University (EMU), Famagusta /North Cyprus
Multipath TCP
Join capability
HMAC
Middlebox
3G
4G
Handover
Exploring Mobile/WiFi Handover with Multipath TCP
Technical Report
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oai:i-rep.emu.edu.tr:11129/21132016-02-17T00:00:19Zhdl_11129_1949hdl_11129_390
EMU I-REP
author
Amca, Hasan
2016-02-16T08:56:12Z
2016-02-16T08:56:12Z
2001-03
Hasan Amca, (2001),"Information Technology in Education ",International Information Technology Workshop.
http://hdl.handle.net/11129/2113
(IT) opened up a new era, “The Digital
Age”, in which every business had to adapt promptly to
these advances or lose the competition. Education
systems, lying in the heart of all businesses, must also be
upgraded so as to supply the personnel demanded by the
industry. Here, we discuss the influence of Information
Technology (IT) and Instructional Technology on the
current education system and the adaptation procedures
to the future.
en
International Information Technology Workshop, (17-18 March 2001), Ledra Palace, Nicosia / Cyprus
digital world
information Technology (IT)
education systems
learning and teaching in the digital age
multi - cultural
learning rather than memorizing
multi- lingual
teacher’s computer expertise
Information Technology in Education
Article
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oai:i-rep.emu.edu.tr:11129/21652016-02-29T12:45:01Zhdl_11129_817
EMU I-REP
author
Hüseyin, Bilgekul
author
Amca, Hasan
2016-02-29T12:43:33Z
2016-02-29T12:43:33Z
1996-10
Huseyin Bilgekul and Hasan Amca,Multicarrier Transmission Using Quadrature frequency/Phase Modulation, Electronics Letters, Vol.32, No.22, pp.2051-2053, Oct. 1996.
1350-911X (online)
0013-5194 (print)
DOI: 10.1049/el:19961386
http://dx.doi.org/10.1049/el:19961386
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=543808
http://hdl.handle.net/11129/2165
Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1049/el:19961386) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.
Multicarrier (MC) systems using quadrature frequency and phase modulation (QFPM) schemes called MC-QFPM are described. In MC-QFPM systems, the power efficiency and resistance lo dehy
spread can be increased for the price of reduced bandwidth cffkiency. M-ary orthogonal frequency-shift-keying with M = I, 2 and 4 are considered along with MC modulation. The BER performance of MC-QFPM schemes in frequency selective delay
spread environments is examined and compared
eng
Electronics Letters
10.1049/el:19961386
info:eu-repo/semantics/openAccess
modulation
frequency modulation
phase modulation
delays
digital communications
error statistics
frequency shift keying
quadrature phase shift keying
Multicarrier transmission using quadrature frequency/phase modulation
article
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oai:i-rep.emu.edu.tr:11129/22192016-03-09T00:00:21Zhdl_11129_3
EMU I-REP
advisor
Amca, Hasan (Supervisor)
advisor
Rızaner, Ahmet (Co-Supervisor)
author
Kavianirad, Shahrzad
2016-03-08T20:24:30Z
2016-03-08T20:24:30Z
2015-08
2015
Kavianirad, Shahrzad . (2015). Performance of DVB-T System under Multipath Fading with LS Channel Estimation and Equalization. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2219
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2015. Supervisor: Prof. Dr. Hasan Amca and Co-Supervisor: Assoc. Prof. Dr. Ahmet Rizaner .
Digital Video Broadcast-Terrestrial (DVB-T) is a broadly used digital television standard in use around the globe for terrestrial television transmission. It offers many services and enables efficient use of the available radio frequency spectrum than the previous multiplexing modulation techniques to provide high data rates along with robustness against multipath. However, due to the frequency selectivity of the channel, DVB-T systems show poor performance and high probability of errors.
In this research, DVB-T system has been implemented in accordance with European Telecommunications Standards Institute (ETSI), EN 300 744 standard. Simulations and analysis based on performance evaluation of DVB-T system in Portable Indoor (PI), Portable Outdoor (PO), Rural Area (RA6), Rayleigh and Typical Urban (TU6) channel models has been conducted. In order to overcome the distortions caused by the multipath channel, Least Square (LS) channel estimation method has been proposed. BER performance of the system has been analysis for 4, 16 and 64 QAM constellations in all five channels. In order to clarify the results image transmission has been done for all three constellations in mentioned channels. As a result in received image distortion has been appeared as a salt and pepper noise, so that we proposed Median filter to overcome with channel noise. However in 4-QAM and 16-QAM the result was acceptable, in 64-QAM constellation result could not be clarify completely, although in RA6 channel with 24dB SNR and with usage of Median filter good improvement can be observed.
ÖZ:
Sayısal Karasal Yayıncılık (SKY), karasal televizyon yayını için dünya çapında yaygın olarak kullanılan dijital televizyon standardıdır. Bu standart, çokyollu kanala karşı sağlamlığının yanında yüksek veri hızlarına ulaşmak için mevcut radyo frekans spektrumunun daha önceki modülasyon tekniklerinden daha etkili kullanımını sağlayan birçok hizmetleri sunmaktadır. Ancak, kanalın frekans seçici olduğu ortamlarda SKY sistemleri zayıf performans ve yüksek hata oranları vermektedir.
Bu araştırmadaki benzetimler ETSI EN 300 744 standardına uygun olarak gerçekleştirilmiştir. SKY sisteminin performans değerlendirmesi için gerekli benzetim çalışmaları ve analizler Bina içi Taşınabilir (BT), Açık hava Taşınabilir (AT), Kırsal Alan (KA), Rayleigh ve Tipik Kentsel (TK) kanal ortamlarında gerçekleştirilmiştir. Çokyollu kanaldan kaynaklanan bozulmaların üstesinden gelebilmek için, En Küçük Kareler (EKK) kanal kestirim yöntemi önerilmiştir. Sistemin Bit Hata Oranı (BHO) 4, 16 ve 64 QAM kullanılarak beş farklı kanal durumunda analiz edilmiştir. Görüntü aktarımının söz konusu kanallar altında nasıl olacağını gösteren çalışmalar her üç işaret kümesi için gerçekleştirilmiştir. Alına görüntülerde tuz ve biber gürültü olarak bilinen bozulmalar ortaya çıkmış ve bu bozulmaların üstesinden gelebilmek için ortanca süzgeci önerilmiştir. 4 ve 16-QAM ortamlarında kabul edilebilir sonuçlar alınabilmesine rağmen 64-QAM kullanılması durumunda tatmin edici sonuçlar alınamamıştır ancak RA6 ortamında 24dB’de ortanca süzgeci kullanımıyla 64-QAM ortamında da iyileşme gözlemlenmiştir.
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic Engineering
Digital television -Television broadcasting
Television broadcasting - Digital video
DVB-T
OFDM
LS estimation
multipath fading channels
median filter
Performance of DVB-T System under Multipath Fading with LS Channel Estimation and Equalization
masterThesis
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oai:i-rep.emu.edu.tr:11129/26752016-05-24T23:00:33Zhdl_11129_3
EMU I-REP
advisor
Uyguroğlu, Rasime
author
Zakariyya, Sikiru Olayinka
2016-05-24T09:35:11Z
2016-05-24T09:35:11Z
2015-09
2015-09
Zakariyya, Sikiru Olayinka . (2015). Modeling of Miniaturized, Multiband and Ultra-Wideband Fractal Antenna . Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2675
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2015. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
Due to advancements in communication technology, there is an increase in the demand of small size, low cost, multiband and wideband antennas. With a view to address these demands, a fractal design was employed in this study. Despite the advantages provided by these antennas, miniaturization and performance enhanced further by using a partial ground plane. This research work presents an antenna which is based on the well-known Sierpinski Carpet fractal with iteration factor of 1/3. The antenna was designed up to third iteration with a view of achieving miniaturization. A simple antenna was designed for purpose of comparison, by using a simple rectangular slot at the middle of the patch and a 34.88% size reduction was achieved at the same resonant frequency. This is achieved by introducing defected ground structure into the design which gives the antenna wideband behaviour with bandwidth of 442MHz at centre frequency of 2.45GHz.
A multiband square patch antenna using third order Sierpinski Carpet was designed to operate at 1.88GHz alongside a new circular fractal antenna up to third iteration with a partial ground structure to achieve ultra wideband behaviour with a bandwidth of 8.18GHz at centre frequency of 2.54GHz. The designed antenna was simulated using three dimensional finite integration time domain commercial software microwave studio. The objective of this thesis to design a fractal antenna with small size, multiband and wideband behaviour was largely met.
Keywords: Miniaturized, Multiband and Ultra Wideband antenna, Fractal geometries, Partial Ground Structure.
İletişim teknolojisindeki gelişmeler ile, küçük boyutlu, düşük maliyetli, çok bantlı ve geniş bantlı anten taleplerinde büyük bir artış olmuştur. Bu talepleri karşılamak üzere yapılan bu çalışmada fraktal anten tasarımları gerçekleştirilmiştir. Fraktal antenlerin sağladığı bu avantajlara rağmen, performansının artırılması ve boyutlarının küçültülmesi için kısmi yer düzlemi uygulamak gerekmiştir. Bu çalışma, 1/3 yineleme faktörü ile bilinen Sierpinski Halı fractal anten tasarımına dayalı bir tasarım içermektedir. Anten, minyatür anten elde etmek amacıyla üçüncü yineleme faktörüne (iterasyon) kadar tasarlanmıştır. Karmaşık yapıları ile bilinen fraktal antenlerin performansı ile karşılaştırma maksatlı basit bir anten tasarlanmış ve aynı rezonans frekansında antenin boyutunda %34.88 küçülme sağlanmıştır. Tasarımda, arızalı zemin yapısı kullanılarak, geniş band davranışı gösteren 442MHz’lik bir bant elde edilmiştir.
Bu çalışmada, 1.88GHz frekansında üçüncü dereceden kare Sierpinski Halı ile kısmi yer düzlemli, dairesel fraktal anten tasarımı gerçekleştirimiştir. İki durum için de anten çok band ve çok geniş band elde etmek için üçüncü iterasyona kadar tasarlamnıştır. Kısmi yer düzlemi ile ultra geniş bant davranış gösteren dairesel fraktal anten, 2.54GHz merkez frekansında 8.18GHz’lik bir bant genişliğine sahiptir. Çalışma tam-dalga benzetim programı kullanılarak yapılmıştır.
Bu tezin amacı olan, küçük boyutu, çok bantlı ve geniş bantlı davranış gösteren bir fraktal anten tasarımı büyük ölçüde gerçekleştirilmiştir.
Anahtar Kelimeler: minyatür, Çok Bantlı ve Ultra Geniş Bantlı anten, Fraktal geometri, Kısmi yer düzlemi.
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic Engineering
Antennas (Electronics)
Broadband communication systems
Miniaturized, Multiband and Ultra Wideband antenna, Fractal geometries, Partial Ground Structure
Modeling of Miniaturized, Multiband and Ultra-Wideband Fractal Antenna
masterThesis
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oai:i-rep.emu.edu.tr:11129/27302016-06-13T23:00:30Zhdl_11129_3
EMU I-REP
advisor
İnce, Erhan A.
author
Malekan, Mostafa
2016-06-13T04:55:39Z
2016-06-13T04:55:39Z
2015-06
2015
Malekan, Mostafa. (2015). Face Recognition Based on Local Zernike Moments . Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2730
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2015. Supervisor: Assoc. Prof. Dr. Erhan A. İnce.
The thesis combines Principal Component Analysis (PCA) (a dimensionality reduction tool), Local Zernike Moments (LZM) (a filtering method), and some image processing techniques to design a face recognition system based on minimum distance criteria. During simulations, training images were first partitioned and then passed through an LZM transformation to compute moments at each pixel by considering local neighborhood of the pixels in each sub-image. Repeating this calculation for different moment components a set of complex moment images were obtained. Then for each moment image phase and magnitude histograms (PMHs) were extracted. To cut down on processing time the extracted histograms were then concatenated and PCA was applied to extract a reduced dimensionality set that represents the data well.
The thesis presents simulation results that are two-fold. The first set of results are achieved by computing moment images that are obtained by partitioning the input intensity image, normalizing the sub-regions, passing them through an LZM filter and then extracting and concatenating the phase and magnitude histograms (PMH) of each smaller moment-image to create a final feature vector that can be used for recognition purposes. The second set of results are obtained by performing almost the same steps but after the LZM filtering the reduced size moment-images are passed through a 2D Gaussian weighting operation. The Gaussian weighting kernel used was the same size as the sub-region and the standard deviation was taken as 8. The histograms were created by multiplying the magnitude of each pixel with the corresponding kernel weight before histogram binning. In both simulations since the final feature vectors obtained after concatenating the PMHs of all the sub-moment-images are long (high computational complexity) we have used PCA to reduce the size of the feature vectors. Finally our system was tested using some probe sets from the ‘The Face Recognition Technology’ (FERET) image database and rank1 to rank5 matches were found based on minimum distance calculations.The recognition accuracy for our system was tested using four different probe sets (FaFb, FaFc, Dup-I and Dup-II) from FERET image database. While using reduced dimensionality feature vector based on PMHs the accuracy of recognition for the probe sets FaFb, FaFc, Dup-I and Dup-II were respectively 94%, 86%, 73%, and 70%. When a 2D Gaussian kernel is applied on the magnitude of the moment images obtained from the LZM filter the corresponding accuracies for the same probe sets became 97%, 95%, 78%, and 76%. This indicates that filtering the moment-images using a 2D weighting function helps improve the results on average by 5.75 %.
Finally we have compared the accuracy of our proposed system with face recognition systems using Local Binary Patterns (LBP) and Histograms Local Zernike Moments (H-LZM). Results indicate that our H-LZM-PCA methods would provide higher recognition rates for all probe sets when compared with the LBP and while using reduced dimensionality feature vector by PCA algorithm, features vectors were limited to facial features by removing other additional information and since the dimensions are reduced, computation time reduced when compared with H-LZM.
Keywords: Face Recognition; Local Zernike Moments; Principle Component Analysis; FERET Database; Local Binary Patterns;
ÖZ: Bu tez çalışmasında, en küçük mesafe kriterine dayalı bir yüz tanıma sistemi tasarlanmak üzere, Temel Bileşen Analizi (TBA) (bir boyutluluk indirgeme aracı), Yerel Zernike Momentleri (YZM) (bir filtreleme yöntemi) ve bazı görüntü işleme teknikleri birleştirilmiştir. Simülasyonlar boyunca, ilk olarak eğitme görüntüleri bölümlenmiş olup daha sonra ise her bir alt-görüntüdeki piksellerin yerel komşuluğu dikkate alınarak her bir pikseldeki momentler hesaplanmak üzere bir YZM dönüşümünden geçirilmiştir. Bu hesaplama işlemi farklı moment bileşenleri için tekrarlanarak bir karmaşık moment görüntü seti elde edilmiştir. Daha sonra her bir moment görüntüsü için faz ve büyüklük histogramları (FBH) çıkarılmıştır. Daha sonra işlem süresinin azaltılması amacı ile çıkarılan histogramlar birleştirilmiş olup verileri uygun bir şekilde temsil eden boyutluluğu indirgenmiş bir setin çıkarılması amacı ile TBA uygulanmıştır.
Bu tez çalışması iki-kat olan simülasyon sonuçlarını sunmaktadır. Sonuçların ilk seti, giriş yoğunluk görüntüsünün bölümlenmesinden elde edilen moment görüntülerinin hesaplanması, alt-bölgelerin normalize edilerek bir YZM dönüşümünden geçirilmesi ve daha sonra ise tanıma amaçları için yararlanılabilecek nihai bir özellik vektörünün oluşturulması için daha küçük olan her bir moment-görüntü için faz ve büyüklük histogramlarının (FBH) çıkarılması ve birleştirilmesinden elde edilmiştir. Sonuçların ikinci seti ise neredeyse aynı adımların uygulanması sonucunda elde edilmiş olup ancak YZM filtreleme işleminden sonra boyutları indirgenmiş olan moment-görüntüleri iki boyutlu bir Gauss filtresinden geçirilmiştir. Kullanılan Gauss ağırlıklandırma çekirdeği alt-bölge ile aynı boyuta sahip olup standart sapma ise 8 olarak dikkate alınmıştır. Histogramlar, her bir pikselin büyüklüğünün histogram gruplandırmasından önceki ilgili çekirdek ağırlığı ile çarpması sonucunda oluşturulmuştur. Her iki simülasyonda da tüm alt-moment-görüntülerin FBH’larının birleştirilmesi sonucunda elde edilen nihai özellik vektörlerinin uzun olması nedeniyle (yüksek hesaplama karmaşıklığı) özellik vektörlerinin boyutlarının indirgenmesi amacı ile TBA kullanılmıştır. Son olarak sistemimiz “Yüz Tanıma Teknolojisi” (YTT) görüntü veri tabanından bazı sonda setleri kullanılarak test edilmiş olup 1.Derece ile 5.Derece arası dereceler, en küçük mesafe hesaplamalarına dayanılarak elde edilmiştir.
Sistemimiz için tanıma doğruluğu, YTT görüntü veri tabanından dört farklı sonda seti (FAFB, FAFC, Dup-I ve Dup-II) kullanılarak test edilmiştir. FBH’a dayalı boyutluluğu indirgenmiş özellik vektörü kullanıldığında FaFb, FaFc, Dup-I ve Dup-II sonda setleri için tanıma doğruluğu sırasıyla %94, %86, %73 ve %70 olarak elde edilmiştir. YZM filtresinden elde edilen moment görüntülerinin büyüklüğü üzerinde iki boyutlu bir Gauss çekirdeği uygulandığında ise aynı sonda seti için ilgili doğruluk oranları sırasıyla %97, %95, %78 ve %76 olmuştur. Bu sonuçlar iki boyutlu ağırlıklandırma fonksiyonu kullanılarak moment-görüntülerin filtrelenmesinin sonuçların ortalama %5.75 oranında iyileştirilmesine yardımcı olduğunu göstermektedir.
Son olarak Yerel İkili Örnekler (YİÖ) ve Yerel Zernike Moment Histogramları (H-YZM) kullanılarak önerilen sistemin doğruluğu, yüz tanıma sistemleri ile karşılaştırılmıştır. Elde edilen sonuçlar, önerilen H-YZM-TBA yöntemlerinin YİÖ ile karşılaştıtrıldığında tüm sonda setleri için daha yüksek tanıma oranları sunacağını
göstermektedir ve TBA algoritması tarafından azaltılmış boyut özellik vektörü kullanırken, özellik vektörlari diğer ek bilgiler kaldırarak yüz özellikleri sınırlandırıdı ve boyutları azaltıldi bu yana H-YZM ile karşılaştırıldığında hesaplama süresi azaltılmış.
Anahtar Kelimeler: Yüz Tanıma; Yerel Zernike Momentleri; Temel Bileşen Analizi; YTT Veri Tabanı; Yerel İkili Örnekler;
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic
Image processing - Digital techniques
Face Recognition
Local Zernike Moments
Principle Component Analysis
FERET Database
Local Binary Patterns
Face Recognition Based on Local Zernike Moments
masterThesis
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URL
http://i-rep.emu.edu.tr:8080/xmlui/bitstream/11129%2F2730/3/MostafaMalekan.pdf.txt
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oai:i-rep.emu.edu.tr:11129/28902016-08-19T06:12:12Zhdl_11129_787hdl_11129_817hdl_11129_781
EMU I-REP
author
Garip, Mehmet U.
author
Erdil, Erzat
author
Bilsel, Ayhan
2016-08-19T06:12:12Z
2016-08-19T06:12:12Z
2006
M. Garip, E. Erdil& A. Bilsel; “Engineering Faculty Attitudes to General Chemistry Courses in Engineering Curricula”,
JOURNAL OF CHEMICAL EDUCATION 83(12): 1873-1878 2006
0021-9584(print)
1938-1328(online)
http://eric.ed.gov/?id=EJ755014
http://hdl.handle.net/11129/2890
Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.
A survey on the attitudes of engineering faculty to chemistry, physics, and mathematics was conducted with the aim of clarifying the attitudes of engineering faculty to chemistry courses in relation to engineering education or curricula and assessing their expectations. The results confirm that on the whole chemistry is perceived as having a legitimate place as a core course in engineering curricula with frequently appearing comments from faculty to make chemistry relevant to real-life problems and everyday applications.
eng
Amer Chemical Soc
info:eu-repo/semantics/embargoedAccess
CHEMISTRY
MULTIDISCIPLINARY, EDUCATION
SCIENTIFIC DISCIPLINES, Engineering Education
Engineering faculty attitudes to general chemistry courses in engineering curricula
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oai:i-rep.emu.edu.tr:11129/28552016-08-05T23:00:32Zhdl_11129_819
EMU I-REP
author
Amca, Hasan
2016-08-05T10:35:29Z
2016-08-05T10:35:29Z
2015-08-03
Üniversitelerin kalitesinin rakamlarka değil, eğitim-öğretim, araştırma ve tpluma/dünya kültürüne yapılan katkılarla ölçülebileceği örneklerle anlatılmıştır.
http://emuprnews.emu.edu.tr/3agustos2015/haber1.jpg
http://hdl.handle.net/11129/2855
Üniversitelerin Kalitesi Meselesi!
Üniversitelerin Kalitesi Meselesi
tur
Kıbrıs Postası, Kıbrıs Gazetesi
info:eu-repo/semantics/openAccess
Üniversitelerin Kalitesi Meselesi
Üniversitelerin Kalitesi Meselesi
Üniversiteler - Kalite - Kuzey Kıbrıs Türk Cumhuriyeti
Kıbrıs Üniversiteleri
Üniversitelerin Kalitesi Meselesi!
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Üniversitelerin Kalitesi Meselesi.pdf.txt
URL
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oai:i-rep.emu.edu.tr:11129/29292016-09-30T23:00:50Zhdl_11129_3
EMU I-REP
advisor
Uyguroğlu, Rasime
author
Sohail, Muhammad
2016-09-30T08:54:28Z
2016-09-30T08:54:28Z
2016-02
2016
Sohail, Muhammad. (2016). Near Field Focusing of Rectangular Microstrip Patch Antenna Array . Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2929
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2016. Supervisor: Assist. Prof. Dr. Rasime Uyguroğlu.
Near Field focusing is one of the most demanded current day research study.
Microstrip patch antenna arrays are widely used for the purpose of focusing the
radiation from an antenna in the near field (Fresnel) region. Several researchers are
working to reduce the focused spot size and improve the power density within the
focused region. A 44 microstrip patch antenna array has been proposed here to be
used as a near field focused array at a distance of 800mm in the space with respect
to the reference origin at frequency 2.4GHz . A 36mm28mm inset fed microstrip
patch antenna has been used, with dielectric substrate FR4 . The thickness of the
substrate is 1.6mm. Radiation from the antenna is focused at the focal point by
providing each element with a different phase shift with respect to the reference
point. The designed structure is a focused MPA array, having maximum radiation at
350mm away from the aperture. The sport size at the point of maximum radiation is
2 80120mm , while at the focal point the size of spot is 2 260260mm . The
structure is furthermore modified, in order to move the main beam of the focused
field with variation in the frequency. The movement of the main beam is achieved by
introducing extra lengths of microstrip lines which are multiples of wavelengths. The
proposed structure is able to vary the position of main beam with variation in
frequency.
Keywords: Microstrip patch antenna, near field, NFF antennas, phase distribution,
return loss, E-Field radiation.
ÖZ:
Günümüzde, yakın alan odaklama konusu, en çok talep edilen mikrodalga araştırma
konularından biridir. Mikroşerit yama anten dizileri, anten ışınlarının yakın alan
odaklaması için yaygın olarak kullanılmaktadırlar. Birçok araştırmacı, odaklanan
bölgenin boyutunu azaltmak ve odaklanmış bölgedeki güç yoğunluğunu artırmak için
çalışmalar yapmaktadır. Bu çalışmada, 2.4GHz frekansında, besleme referans
noktasından 800mm uzaklıktaki alana odaklanan, bir mikrodalga yama anten dizisi
önerilmiştir. Gömme mikroşerit besleme ile beslen 3628mm boyutlarındaki
antenin alt tabakasında FR-4 kullanılmıştır. Alt tabaka kalınlığı 1.6mmolarak
alınmıştır. Anten radyasyonunun belli bir bölgede odaklanmasını sağlamak için,
dizideki her eleman için bir referans noktasına göre faz kayması uygulanmıştır. Faz
farkı, bireysel antenlerin radyasyonunun uzayda, yakın alan bölgesindeki bir noktada
odaklanmasını sağlamaktadır. Tasarlanan anten, 350mm mesafede 2 80120mm
boyutundaki alanda maksimum radyasyona sahip, odak noktasında ise
2 260260mm alanda odaklanan bir mikroşerit yama dizi antendir. Tasarım, frekans
değişimi ile odak alanını hareket ettirmek amacıyla, geliştirilmiştir. Ana hüzmenin
hareketi, mikroşerit hatlara dalgaboyunun katları olan hatlar ilave edilerek elde
edilmiştir ve bilgisayar benzetim teknolojisi ile teori başarı ile test edilmiştir.
Anahtar Kelimeler: Mikroşerit yama anten, yakın alan, NFF antenler, faz dağılımı,
geri dönüş kayıbı, E-alanı, ışıma eğrisi.
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic
Antennas (Electronics)
Broadband communication systems
Microstrip patch antenna
near field
NFF antennas
phase distribution
return loss
E-Field radiation
Near Field Focusing of Rectangular Microstrip Patch Antenna Array
masterThesis
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URL
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File
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oai:i-rep.emu.edu.tr:11129/28602016-08-18T23:00:38Zhdl_11129_389
EMU I-REP
author
Omisakin, Adedayo
author
Amca, Hasan
2016-08-18T07:01:21Z
2016-08-18T07:01:21Z
2016-08-18
http://hdl.handle.net/11129/2860
DATA TRANSMISSION USING HIERARCHICAL MODULATION OVER A MOBILE WIRELESS CHANNEL
This project is about the modeling and simulation of data transmission (picture or video) ,using hierarchical modulation over a mobile wireless channel characterized by Rayleigh fading, Additive White Gaussian Noise (AWGN) and shadowing with two-Antenna diversity selection for system improvement. The objectives are to determine which modulation technique will be best suitable- Quadrature Amplitude Modulation (QAM) or Phase Shift Keying(PSK), the maximum level of modulation as well as switching decisions that will meet the Bit Error Rate (BER) target of 10-3,and choosing between uncompressed and compressed transmission of data(images or video) through the channel. The entire modelling and simulation is done using Matlab and Simulink software. Result shows QAM’s poor performance and irreducible bit error rate, and extremely great distortion when compressed data is being transmitted. From the result, conclusions can be drawn that PSK performs better than QAM over the channel and that uncompressed data transmission over the channel is better in terms of error sensitivity and since uncompressed images and video was able to be enhanced appreciably using median filtering.
eng
-;-
info:eu-repo/semantics/openAccess
Wireless Communications, Hierarchical modulation, QAM, PSK, Rayleigh fading , Eb/No, BER, Median filtering ,Compressed video
DATA TRANSMISSION USING HIERARCHICAL MODULATION OVER A MOBILE WIRELESS CHANNEL
project
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oai:i-rep.emu.edu.tr:11129/28812016-08-19T23:00:30Zhdl_11129_390hdl_11129_1949
EMU I-REP
author
Erdil, Erzat
author
İlkan, Mustafa
author
Gürkan, Ahmet
2016-08-19T05:10:55Z
2016-08-19T05:10:55Z
2001
http://www.ktemo.org/uploads/documents/12-06_yenilenebilir_enerji_kaynaklari_ve_temiz_cevre.pdf
http://hdl.handle.net/11129/2881
Turizmin temel unsurları, kesintisiz enerji ve temiz çevre oldugu gerçegi ile çevre dostu yenilebilir enerji
kaynaklarının kullanımı ve bunların çevreye olan olumlu etkileri ile dolaylı olarak turizme olan pozitif
katkıları inceleyip ileriye dönük öneriler gelistirmistir.
tur
KTEMO
info:eu-repo/semantics/openAccess
Alternatif, enerji, çevre, karbondioksit emisyonu, küresel ısınma, turizm
Yenilenebilir Enerji Kaynakları ve Temiz Çevre
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oai:i-rep.emu.edu.tr:11129/28942016-08-22T23:00:41Zhdl_11129_3
EMU I-REP
advisor
Amca, Hasan (Supervisor)
advisor
Ulusoy, Ali Hakan (Co-Supervisor)
author
Malik, Muhammad Waqas
2016-08-22T11:47:23Z
2016-08-22T11:47:23Z
2015-02
2015
Malik, Muhammad Waqas. (2015). Video Transmission Using Scalable Video Coding For 4G Wireless Communications Systems. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2894
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2015. Co-Supervisor: Assoc. Prof. Dr. Ali Hakan Ulusoy, Supervisor: Prof. Dr. Hasan Amca.
The technology foundation preferred by 4G wireless broadband networks is Long Term Evolution (LTE). This is because of its speed, robustness and lots of significant technological and business advantages. In recent years, applications based on video streaming have turned out to be immensely important. Due to the data-intensive nature of videos, alternatives for the delivery process have been investigated. In order to maximize throughput and video quality, Scalable Video Coding (SVC), combined with adaptive modulation and coding schemes and wireless multicast provides an excellent solution for streaming video to heterogeneous wireless devices. By choosing different modulation and coding schemes for different video layers, SVC can provide good video quality to users in good channel conditions while maintaining basic video quality for users in bad channel conditions. SVC provides three sorts of scalability, i.e. the spatial, temporal and quality scalability. Quality scalability in particular, plays an important role on the Quality of Experience. In view of the above, the research in the thesis addresses the specific problem of the performance assessment of video traffic over a wireless communication link with varying channel conditions. The objective of the research is to mainly involve re-definition of system quality measures and parameters to adjust (such as modulation and video quality) for improvement of these quality measures and implement a successful SVC scenario where optimization of performance over varying channel conditions and scaling rate for the SVC is obtained. Keywords: LTE, SVC, modulation and coding schemes, quality scalability.
ÖZ: Long Term Evolution (LTE) teknolojisi 4G kablosuz geniş bant ağları tarafından tercih edilen teknolojidir. Bu tercih teknolojinin sağladığı hız, sağlamlık ve önemli teknolojik ve ticari avantajdan kaynaklanmaktadır. Son yıllarda, video akışı işlemlerine dayalı uygulamalar son derece popüler olmuştur. Videoların yoğun veri boyu nedeniyle, veri aktarım süreci için alternatif araştırmalar yapılmıştır. Veri hızını ve video kalitesini en üst düzeye çıkarmak için, değişken modülasyon ve kodlama düzenleri ile birlikte kullanılan Ölçeklenebilir Video Kodlama (ÖVK) kablosuz çoğa gönderim yöntemi ile heterojen kablosuz aygıtlara video akışı için mükemmel bir çözüm sağlamıştır. Farklı modülasyon ve kodlama şemaları seçimi ile ÖVK kötü kanal koşullarındaki kullanıcılar için temel video kalitesini korurken, iyi kanal koşullarındaki kullanıcılar için iyi video kalitesi sağlayabilmektedir. ÖVK uzamsal, zamansal ve nitelik olarak üç değişik türde ölçeklenebilirlik desteklemektedir. Özellikle nitelik ölçeklenebilirlik, deneyim kalitesi üzerine önemli bir rol oynar.
Yukarıdakiler ışığında, tezdeki araştırma değişen kanal koşullarına sahip kablosuz iletişim bağlantısı üzerindeki video akışında oluşacak sorunun giderilmesine yöneliktir. Araştırmanın amacı esas olarak sistemin kalite ölçüm ve parametre ayarlarının (örneğin modülasyon ve video kalitesi gibi) yeniden tanımını yaparak kalite ölçümlerinde iyileştirme sağlamak ve değişen kanal şartlarında başarılı bir ÖVK senaryosu oluşturabilmektir.
Anahtar Kelimeler: LTE, ÖVK, modülasyon düzeni, nitelik ölçeklenebilirlik.
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic Engineering
Image transmission - Image processing - Digital techniques
Multimedia communications - Image processing - Wireless communication systems
LTE, SVC, modulation and coding schemes, quality scalability
Video Transmission Using Scalable Video Coding For 4G Wireless Communications Systems
masterThesis
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oai:i-rep.emu.edu.tr:11129/29192016-09-30T23:00:48Zhdl_11129_3
EMU I-REP
advisor
Kükrer, Osman
author
Manasra, Ayman Yousef
2016-09-30T07:41:18Z
2016-09-30T07:41:18Z
2016-02
2016
Manasra, Ayman Yousef. (2016). Denoising Using Low-Pass Filtering Combined With Total Variation Filtering. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2919
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2016. Supervisor: Prof. Dr. Osman Kükrer.
Generally LTI filters are appropriate to denoise a signal that have low-frequency band. On the other hand, total variation denoising is appropriate to filter a signal having sparse representation. Some signals cannot be classified as having specific frequency band, or having sparse representation, such as the signal comprised in biomedical applications (near infrared spectroscopic imaging and nano-particle biosensing). This thesis introduces a new approach for denoising signals based on low-pass filtering combined with total variation denoising, assuming that the noisy observation is near infrared spectroscopic time series measurement, which can be modelled as a sum of two components, one of them low frequency and the other sparse or sparse derivative. The problem is formulated in terms of an optimization problem, and the cost function of the optimization problem is convex. As a consequence, two iterative algorithms are presented; the first one is derived using the majorization-minimization technique, and models the signals as consisted of low frequency and sparse derivative components. On the other hand, the second algorithm is derived using alternative direction method of multipliers, and models the signals as consisted of low frequency, sparse and sparse derivative components. In view of the above, simulation algorithms based on existing noisy observations are developed for validation and verification of the proposed approach. The simulation results show that the proposed approach for denoising signals recovers the signals well. Furthermore, it was found that the proposed approach is better in terms of run time.
Keywords: NIRS, low-pass filter, total variation denoising, sparse derivative.
ÖZ:
LTI filtereler genellikle düşük frekans bandında olan sinyallerin gürültüden temizlenmesi için uygundur. Diğer yandan, toplam değişim gürültü giderme, seyrek temsiliyeti olan sinyalleri filtreleme için uygundur. Bazı sinyaller, yalnız belirli bir frekans bandına sahip, veya yalnız seyrek temsiliyeti olan sinyal diye tanımlanamaz. Buna örnek, biomedikal uygulamalarda karşılaşılan (yakın kızılötesi spektroskopik görüntüleme ve nano-parçacık bio-algılama) sinyallerdir. Bu tez, düşük-frekans geçirgen filtereleme ve toplam değişim gürültü gidermenin, sinyallerin gürültü giderilmesi için birarada kullanıldığı bir çalışmaya dayanmaktadır. Gürültülü verinin yakın kızılötesi spektroskopik zaman-dizisi ölçümlerinden elde edildiği varsayılmaktadır. Bu veri, biri düşük frekans içerikli, diğeri ise seyrek veya seyrek türevi olan iki sinyalin toplamı olarak modellenebilir. Problem, bir eniyileştirme problemi olarak düzenlenip, maliyet işlevi konvekstir. Problemin çözümü için iki tane algoritma incelenmiştir. Birincisi büyükleme-en aza indirgeme yöntemine dayanıp sinyali, düşük frekans içerikli ve seyrek türevli bileşenlerden oluşan sinyal olarak modellemektedir. İkinci algoritma ise sinyali düşük frekans içerikli ve seyrek ek olarak seyrek bir bileşenden oluşan sinyal olarak modeller, ve.Bu algoritmalar, önerilen yaklaşımı doğrulamak üzere, gerçek gözlemlerle elde edilmiş gürültülü sinyal uygulanmıştır. Benzetim sonuçları algoritmaların, sinyallerin gürültüden temizlenmesinde başarılı olduklarını göstermiştir. Buna ek olarak, önerilen yöntemin hesaplama zamanı olarak diğer yöntemlere göre daha iyi olduğu bulunmuştur.
Anahtar Kelimeler: NIRS, alçak geçiş filtresi, toplam varyasyon filtreler, seyrek türevi.
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic Engineering
NIRS
low-pass filter
total variation denoising
sparse derivative
Denoising Using Low-Pass Filtering Combined With Total Variation Filtering
masterThesis
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oai:i-rep.emu.edu.tr:11129/29432016-09-30T23:00:46Zhdl_11129_3
EMU I-REP
advisor
Demire, Hasan
author
Alkraik, Asma Abdallah
2016-09-30T11:01:50Z
2016-09-30T11:01:50Z
2016-02
2016
Alkraik, Asma Abdallah. (2016). Robust Color Image Watermarking Techniques Based on DWT, DCT and SVD in Different Color Spaces. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Electrical and Electronic Engineering, Famagusta: North Cyprus.
http://hdl.handle.net/11129/2943
Master of Science in Electrical and Electronic Engineering. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Electrical and Electronic Engineering, 2016. Supervisor: Prof. Dr. Hasan Demirel.
Within the last decade, with the development of communication technologies and the
increasing growth in the internet has become insecure, so it created different
techniques to solve this problem. One of these techniques is the digital watermark,
which provides the protection of property rights.
In this thesis, we suggest new techniques of watermarking image aim to increase the
degree of robustness of the watermark against various attacks and to increase the
imperceptibility of the watermark image. Also these techniques aim to ensure the
watermark image using Arnold transform where the watermark is available only to a
legitimate user.
The proposed approaches of watermarking image based on DWT, DCT and SVD
have been applied on gray and color images in different color spaces like RGB, YIQ
and YCbCr. Therefore, we have seven proposed algorithms namely: a gray image
watermarking technique, an image watermarking technique in RGB color space
(using a gray watermark image), an image watermarking technique in RGB color
space (using a color watermark image), an image watermarking technique in YIG
color space (using a gray watermark image), an image watermarking technique in
YIQ color space (using a color watermark image), an image watermarking technique
in YCbCr color space (using a gray watermark image) and an image watermarking
technique in YCbCr color space (using a color watermark image). The difference
between these algorithms is the type of watermark and the colorspace used (gray or
color image: RGB, YIQ or YCbCr). To test the performance of proposed approaches,
we calculated the PSNR and the SSIM.
The best proposed approach which gives high robustness and imperceptibility of the
watermark image against different attacks is an image watermarking technique in
YIQ colour space (using a gray watermark image). And, the worst proposed
approach which gives low robustness and low imperceptibility of the watermark
image against different attacks is an image watermarking technique in YCbCr color
space (using a color watermark image). In addition, our proposed approaches give
high imperceptibility and high robustness of the watermark image when compared
with other techniques [17][22][23].
Through the results, it has been verified superiority of our proposed approaches on
many techniques. Our proposed approaches have high robustness of the watermark
against various attacks with high quality for the watermarked image and security of
the watermark image.
Keywords: Watermarking Image, robustness, imperceptibility, PSNR, SSIM.
ÖZ:
Son on yıl içinde, iletişim teknolojilerinin gelişmesi ve artan büyüme ile İnternet
güvensiz hale gelmiştir, dolayısıyla bu sorunu çözmek için farklı teknikler
geliştirilmiştir. Bu tekniklerden biri de sayısal filigran tekniğidir. Sayısal filigran
temelde mülkiyet haklarının korunmasını sağlamaktadır.
Bu tezde, yeni teknikler kullanarak farklı saldırılara karşı filigran sağlamlığını
artırmak ve filigran görüntüsünün fark edilemezliğini artırmayı hedeflemekteyiz.
Arnold dönüşümü kullanan bu teknikler ile filigran görüntüsüsün sadece meşru bir
kullanıcı tarafından kullanılabilir olması sağlanmaktadır.
DWT , DCT ve SVD dayalı damgalama önerileri RGB , YIQ ve YCbCr gibi farklı
renk uzaylarında gri ve renkli filigranlar kullanılarak uygulanmıştır. Bu çerçevede
yedi farklı algoritma önerilmiştir. Bunlar, sırasıyla: gri görüntü filigran tekniği, RGB
renk uzayında bir filigran görüntü tekniği (gri filigran kullanılarak), RGB renk
uzayında bir filigran görüntü tekniği (renkli filigran kullanılarak), YIG renk uzayında
bir filigran görüntü tekniği (gri filigran kullanılarak), YIQ renk uzayında bir görüntü
filigran tekniği (renkli filigran kullanılarak), YCbCr renk uzayında bir görüntü
filigran tekniği (gri filigran kullanılarak) ve YCbCr renk uzayında bir görüntü
filigran tekniği (renkli filigran kullanılarak). Bu algoritmalar arasındaki farkları renk
uzaylarındaki (RGB , YIQ ya da YCbCr) farklarla filigran türü arasındaki farklar (gri
ya da renkli) oluşturmaktadır. Önerilen yaklaşımların performansını test etmek için
PSNR ve SSIM metrikleri kullanılmaktadır.
Önerilen yaklaşımlar arasında en yüksek sağlamlık ve farklı saldırılara karşı en
kaliteli filigran fark edilemezliği sağlayan yaklaşım (gri filigran görüntü kullanılarak)
YIQ renk uzayında elde edilmişti. Öte yandan, önerilen yaklaşımlar arasında en
düşük sağlamlık ve farklı saldırılara karşı en düşük kalitede filigran fark
edilemezliği sağlayan yaklaşım (renkli filigran kullanılarak) YCbCr renk uzayında
elde edilmişti. Literatürdeki alternatif tekniklerle ([17] [22] [23]) karşılaştırıldığında,
önerilen yaklaşımlar yüksek fark edilemezlik ve yüksek filigran sağlamlığı ortaya
çıkarmaktadır.
Elde edilen sonuçlar, önerilen yaklaşımların literatürdeki yaklaşımlara göre olan
üstünlüğü doğrulanmıştır. Önerilen yaklaşımlar filigranlı görüntünün yüksek kalitede
olmasını ve faklı saldırılara karşı filigran sağlamlığının güvenlik açısından üst
seviyede olduğunu göstermektedir.
Anahtar Kelimeler: Filigramlı görüntü, filigram sağlamlığı, fark edilemezlik,
PSNR, SSIM.
eng
Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)
info:eu-repo/semantics/openAccess
Electrical and Electronic Engineering
Computer security - Digital watermarking - Data protection
Multimedia systems - Digital watermarking
Watermarking Image
robustness
imperceptibility
PSNR
SSIM
Robust Color Image Watermarking Techniques Based on DWT, DCT and SVD in Different Color Spaces
masterThesis
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