Elektrik- Elektronik Mühendisliği: Recent submissions

  • Generalized improved spread spectrum watermarking robust against translation attacks 
    Gerek, Neslihan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this work, we consider the ISS (improved spread spectrum) watermarking framework, and propose a generalized version of it, termed "generalized improved spread spectrum" (GISS), where we achieve both host-interference ...
  • 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 ...
  • 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, ...
  • An efficient hardware implementation of the tate pairing in characteristic three 
    Kömürcü, Giray. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Discrete Logarithm systems with bilinear structure recently became an important base for succesful cryptographic protocols such as identity-based encryption, short signatures and multiparty key exchange. Since the main ...
  • An information gain based feature selection method and a network-based intrusion detection system framework utilizing anomaly detection using self organizing maps 
    Tiryakioğlu, Fatih. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this work, an information gain based feature selection method and a networkbased intrusion detection system utilizing anomaly detection using Self Organizing Maps (SOM) are proposed. KDD 99 (The International Knowledge ...
  • A comparison of fuzzy methods for modeling 
    Aras, Ayşe Çisel. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Type-1 Fuzzy Logic Controllers (FLCs) have been used in control applications for more than thirty years. However, traditional type-1 FLCs are de cient in dynamical unstructured environments and in many real-time applications ...
  • Detecting denial of service attacks in network traffic with maximum entropy and hypothesis testing techniques 
    Çakırtaş, Didem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    With the growth of computer networking and increased dependency of our every day life on the computer based systems, assuring reliable operation of computer systems has become very important. In order to render computer ...
  • Implementation and performance evaluation of sigma-delta modulators 
    Sağlamdemir, Muharrem Orkun. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    SigmaDelta A/D converters have recently become popular since they achieve high resolution by means of oversampling without the need of high accuracy matching of elements and complex analog circuitry. They even reach higher ...
  • 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 ...
  • Design of optimal sampled data linear regulator 
    Ayzan, Ömer. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.)
    Optimal Sampled-data control for linear time invariant processes with quadratic cost criteria are determined through the application of the discrete minimum principle. In order to apply the discrete minimum principle. both ...
  • 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 ...
  • An automatic architecture generator for sigma-delta modulators considering component non-idealities 
    Yetik, Ömer. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In this thesis, a tool generated in MATLAB environment for automatic modeling and architecture synthesis of sigma-delta modulators is introduced. The tool is capable of generating the parametric signal and noise transfer ...
  • 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 ...
  • 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 ...
  • Maximum entropy estimated payload based intrusion detection system "the me-payl" 
    Erhan, Derya. (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 are transferred through private and public networks such as the global internet, ...
  • Simulated and experimental study of antilock braking system using grey sliding mode control 
    Oniz, Yesim. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Antilock Braking System (ABS) is an electronically controlled system that prevents the wheels from locking by limiting the pressure delivered to each slave cylinder of the vehicle. By preventing lock up, ABS gives the ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Digital heart rate monitor and clinical thermometer 
    Altay, Cemil Müjdat. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.)
    In this thesis, a heart rate monitor and digital thermometer has been designed and, built. This instrument has low and high alarms for heart rate and temperature. The device does not need frequent calibration and has an ...