Browsing M.S. Theses by Issue Date

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  • Comparison of single and multi frame super resolution reconstruction algorithms with analytical interpolation methods 
    Özdemir, Hüseyin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Generating high resolution image (or image sequence) from low resolution image (or image sequence) has various applications such as image expansion, printing and conversion between different resolution formats. There is a ...
  • Adaptive optimization of EDCA parameters for QOS in multimedia applications 
    Çil, Alparslan Mustafa. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The MAC layer of the IEEE 802.11 standard defines Distributed Channel Function (DCF), that provides simple and effective medium access mechanism. However with the increasing demand in multimedia applications and higher ...
  • Design and construction of a secure ID-card system using robust image hashing 
    Öztemel, Mehmet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    We present a very simple, cryptographically secure, inexpensive and contactless biometric identity veri cation system. The system we propose is a printout of individual's biometric feature (pictorial data) such as face, ...
  • High performance adaptive sigma delta modulator designs 
    Kurşunoğlu, Sedef. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Improvements in VLSI technology enabled data converters with increased speed. When compared to conventional converters, sigma delta modulators have a higher sampling speed for resolution; and they are less sensitive to ...
  • 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 ...
  • Bootstrapping a speech recognition system by using video text recognition 
    Som, Temuçin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In the broadcast news for the hearing impaired, the information is conveyed by three modalities: speech, sign language and sliding video text. In this work, we propose an HMM-based sliding video text recognition (SVTR) ...
  • 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 ...
  • User selection and density based decision method for cooperative spectrum sensing in cognitive radio networks 
    Çimentepe, Gonca Eryiğit. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Radio spectrum is one of the scarce source and its importance is increasing in recent years due to rapidly developing new technologies. Today's wireless networks use fixed spectrum assignment policy which causes inefficient ...
  • Afronoc: an adaptive flexible network on chip router 
    Çoğal, Ömer. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    As the complexity of on-chip systems grows, scalability and re-configurability becomes an important issue in both system and interconnection levels for SoC systems. Flexible and configurable architectures bring the advantage ...
  • 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 ...
  • Location estimation using RSS measurements with unknown path loss exponents 
    Zeytinci, Musa Bora. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In cellular networks, the location of an MS can be estimated using received signal strength (RSS) measurements from the control channels of several base stations. RSS-based location estimation techniques provide a low-cost, ...
  • Robust speech hashing 
    Şahin, Ekin Olcan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, a robust speech hashing algorithm is proposed and performance of this speech hashing algorithm is compared with several robust audio hashing algorithms. We use phone based frequency-time domain analysis for ...
  • Distributed synchronization in delayed and topology varying networks 
    Cihan, Onur. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    There are numerous network applications where nodes require a common notion of time, and as such distributed synchronization is an important task in topology varying networks. In this thesis, we introduce a well known ...
  • 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 ...
  • Power aware switched capacitor integrator design 
    Korkmaz, Seyrani. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Switched Capacitors are used as resistors because they have better accuracy and they consume less die area than other resistor implementations in integrated circuits. In this technique, a capacitor is charged and discharged ...
  • A unified approach to speech enhancement and voice activity detection 
    Kasap, Ceyhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this work, a unified system for voice activity detection (VAD) and speech enhancement is proposed. In the proposed system, there is mutual exchange of information between VAD and speech enhancement blocks. A new, robust ...
  • Sigma-delta dithering based frequency synthesis and modulation for DCS-1800 
    Atasoy, Oğuz. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Today cell phone industry tends to increase the capabilities of the cell phones and at the same time minimize the cost. This trend reflects itself to frequency synthesizer design. Hence, a cheap and efficient way of designing ...
  • 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 ...
  • 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 ...
  • 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 ...

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