Browsing M.S. Theses by Issue Date

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  • Computer-aided transcription tool 
    Akman, Çağdaş Kayra. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    State-of-the-art speech recognition and language processing systems widely use data-driven methods. These methods require large transcribed speech and annotated text corpora. The success of these systems greatly depends ...
  • Space-time polarization diversity in multiple input multiple output communication systems 
    Sevindik, Volkan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In wireless communications systems, diversity techniques are widely used to combat the e ects of wireless fading channels. Multiple-input multiple-output (MIMO) systems have better performance under fading channels than ...
  • Time-domain blind source separation for convolutive mixtures using second-order statistics 
    Demir, Cemil. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Blind Source Separation (BSS) methods are generally used to separate the speech of people in the same room by using audio data recorded by multi-microphone system. This thesis focuses on a time-domain technique in BSS. In ...
  • High performance adaptive sigma delta modulator designs 
    Gökdel, Yiğit Dağhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In this work two different solutions to the saturation problem of the integrator building block of Sigma Delta modulators are presented. Saturation causes an error that limits the dynamic input range of the Sigma Delta A/D ...
  • Wavelet based detection of network traffic anomalies 
    Hasan, Dağhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Computer Networks can be considered as an important component of today’s human life. Since data and information of various organizations and companies are transferred through private and public networks such as global ...
  • Adaptive neuro fuzzy inference systems (ANFIS) approach for autonomous flight control of unmanned aerial vehicles 
    Eriş, Can. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    This thesis concentrates on an ANFIS based, autonomous flight controller that has generalization capability, for UAVs (Unmanned Aerial Vehicle). Three different ANFIS modules are developed in order to control of the altitude, ...
  • Detecting intrusions in network traffic using maximum entropy technique 
    Tuna, Ömer Faruk. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    As interconnections among computer systems grow rapidly, network security is becoming a major challenge. Computer networks have to be protected against denial-ofservice (DoS) attacks, unauthorized disclosure of information ...
  • Synchronization, channel estimation and detection for ultra-wideband systems 
    Ekrem, Ersen. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Timing acquisition and synchronization of ultra-wideband UWB signals within nanosecond accuracy pose a major impediment. Noise is assumed to be additive white Gaussian noise (AWGN) in all of the works in spite of that ...
  • Angle of arrival estimation for cellular networks in multipath environments 
    Topaloğlu, Orçun. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Estimation of a mobile user’s location within the wireless network has become a significant area of research within the last 10 years. Parallel to the increasing popularity of mobile phones, numerous location estimation ...
  • A combined wavelet and auyoregressive based statistical intrusion detection system "the wavelet-AR IDS" 
    Güven, Umut. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Networks are complex interacting systems and are comprised of several individual entities such as routers and switches. Network performance information is not directly available, and the information obtained must be ...
  • Control of chaotic systems with time delayed feedback control 
    Yakar, Engin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Delayed Feedback Control (DFC) method proposed by Pyragas is a simple and efficient method to control chaotic systems by stabilizing the Unstable Periodic Orbits (UPOs) of these systems. Assuming that a UPO with period T ...
  • Smoothing and refinement of motion vector fields for video frame rate conversion applications 
    Malkoç, Ümit. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    The main goal of Video Enhancement (VE) applications is to improve the visual quality of the video by modifying the input frame sequence. The enhancement operations could be performed in the spatial domain (each frame of ...
  • 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 ...
  • 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 ...
  • Speech retrieval for Turkish broadcast news 
    Parlak, Sıddıka. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Speech retrieval is a recently emerging field of information retrieval, in which the information is spoken, instead of written. So far, spoken information retrieval has been studied in several languages. In this thesis, ...
  • Information theoretic cryptanalysis and reliable communications under codebook mismatch 
    Altuğ, Yücel. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, usage of typicality in two diffrent concepts is investigated. In the first concept, a new approach on cryptanalysis is proposed where the goal is to explore the fundamental limits of a specific class of ...
  • 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 ...
  • Finite difference beam propagation method for analyzing bend enhanced optical touch sensor 
    Afşer, Hüseyin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Analysis of waveguides by computational methods is very important and widely used in optical fiber communications since the power loss due to bending of the optical fibers decreases the channel capacity of the optical fiber ...
  • Radar cross section simulations of arbitrary shapes 
    İstemi, Oya. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    This thesis is about the Radar Cross Section measurements of arbitrary shapes. The progress in radar cross section measurements is strongly related to the progress in Radar technology. Arbitrary shapes, such as aircrafts, ...
  • 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 ...

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