Fen Bilimleri Enstitüsü: Recent submissions

  • Microwave propagation predictions on radio coverage of UMTS 
    Yelen, Satı. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The success story of GSM system is very well known throughout the world. The reason for its success is due to its ability to give services to its users anywhere and anytime. In fact, GSM basically gives speech services. ...
  • Microprocessor controlled single phase to single phase cycloconverter 
    Baş, M. Serdar. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.)
    The object of this thesis is to design and construct a microprocessor-conrolled cycloconverter. The microprocessor is used to generate the gating signals for a single phase to ignle phase cycloconverter, the thyristors ...
  • A comparison of identification techniques for fractional order systems 
    Şenyuva, Rıfat Volkan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    This thesis compares the performances of various identification methods of deterministic and linear systems described by fractional order models. A detailed introduction to fractional calculus and fractional differential ...
  • Bayesian methods for deconvolution of sparse processes 
    Yıldırım, Sinan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this work, various Bayesian methods for deconvolution and blind deconvolu- tion of sparse processes are studied. By using the prior assumption of sparsity, decon- volution and blind deconvolution operations are mapped ...
  • Conversion of current mode continuous time sigma delta converters from 1 bit to 3 bits 
    Akçakaya, Feyyaz Melih. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Sigma delta analog digital converters which are widely used in electronics are gradually achieving faster speeds and lower power consumption. The most important factor that affects speed and power consumption is the type ...
  • Communication theoretic analysis of digital fingerprinting under linear averaging Gaussian attack 
    Dalkılıç, Özgür. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, performance of correlation detector is investigated from a communication theoretic perspective for additive fingerprinting under Gaussian averaging attack. First, digital fingerprinting problem is modeled ...
  • Optimum quantization for detection with side information 
    Ayerden, Nafiz Polat. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this work, we considered the problem of binary detection with side information. The receiver, observes the transmitted data which is corrupted by Gaussian noise, and tries to make a decision between two hypotheses where ...
  • Effects of data duration, model size and session variability on speaker verification performance 
    Dikici, Erinç. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Speaker verification is one of the most challenging branches of biometric authentication. Covering a wide spectrum from security services to law enforcement, speaker veri cation systems are employed in phone banking, ...
  • Analog layout synthesizer for a parasitic aware design loop 
    Unutulmaz, Ahmet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Analog design automation is being studied for a couple of decades and many researchers developed their own tools. However, there are no standards for these tools. The work done in this M.S. thesis aims to define standard ...
  • Frequency domain channel estimation and symbol detection for impulse radio ultra-wireband systems with short cyclic prefix 
    Bahçeci, Salim. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Frequency Domain (FD) reception techniques provide the telecommunication system designers with low complexity receiver structures. However, when ultra-wideband (UWB) communication is considered with long channel impulse ...
  • Detection with partial information for the Gaussian setup in the potential presence of a jammer 
    Özyeşil, Onur. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    We introduce the problem of communication with partial information, where there is an asymmetry between the transmitter and the receiver codebooks. We study this setup in a binary detection theoretic context for the additive ...
  • Realization of charge pump circuits using polymer semiconductors 
    Haydaroğlu, İskender. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, design methodology and test results of a polymer charge pump circuit built using polymer semiconductors are presented. The charge pump is built using basic lithography techniques, in which solution processed ...
  • Nondestructive testing of concrete by ultrasound 
    Kumcuoğlu, Ali Sina. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.)
    In this thesis, nondestructive testing of materials using Ultrasonic techniques has been investigated. Especially the determination of the quality of concrete, how the sonic wave behaves in concrete, relation of acoustic ...
  • Wheeze detection in respiratory sounds via statistical signal modeling 
    Aydöre, Sergül. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The aim of this study is detection of wheeze and non-wheeze epochs within respiratory sound signals acquired from patients with asthma and COPD. Since a wheeze signal, having a sinusoidal waveform, has a different behavior ...
  • Investigation of automatically derived subword units for Turkish LVCSR 
    Aksungurlu, Tuncay. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, we performed large vocabulary continuous speech recognition (LVCSR) experiments using language models that are built upon different recognition units in order to create a suitable and successful language ...
  • Watermarking algorithm based on modified non-negative matrix factorization 
    Kayacan, Can. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Non-negative matrix factorization has become a significant area of research within the last 10 years. After the research paper ”Learning the parts of objects by non-negative matrix factorization” by Daniel D. Lee & H. ...
  • 3.125Gbps FIR equalizer implementation in 65nm CMOS technology 
    Kurnaz, Hande Akın. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    This thesis describes channel degradation in a basic telecommunication system with its sources (crostalk and metalic channel los) and results (inter-symbol interference). Compensation of this channel degradation via ...
  • High performance 16 bit multiplier design using mos current mode logic 
    Delican, Yavuz. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this work, MOS Current Mode Logic (MCML) is determined for low power and high speed applications. A small MCML cell library is developed and optimized for several different performance requirements. These requirements ...
  • Robust facial feature localization in frontal views 
    Çeliktutan, Oya. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, we focus on the reliable detection of facial fiducial points in frontal face images, such as eye, eyebrow and mouth corners. The proposed algorithm aims to improve automatic landmarking performance in ...
  • User cooperative communications in ultra-wideband wireless networks 
    Yalçın, Cumhur Ozan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, we consider the user cooperation in ultra-wideband (UWB) systems characterized by severe frequency selective channels. To circumvent this problem we present a space-time (ST) coded UWB system employing the ...

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