Fen Bilimleri Enstitüsü: Recent submissions

  • Super-resolution spectral estimation methods for buried and through-the-wall object detection 
    Özdemir, Erman. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Seeing the targets behind and inside visually opaque obstacles such as walls using microwave signals is considered as a powerful tool for a variety of applications in both military and commercial paradigms. The ultimate ...
  • Coordinated navigation of spherical robots in three-dimensional workspace: independent and order constrained scenarios 
    Ulutaş, Barış. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, the coordinated navigation of multiple disk-shaped robots is extended to three-dimensional workspace. The robots are assumed all to be spherical and residing within the same spherical workspace. In addition, ...
  • Two approaches to min-max feedback control and design of uncertain systems 
    Eksin, İbrahim. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.)
    In designing control systems with optjmal performance parameter variations pose a great problem. In prjnciple, it is possible to attain an ideal performance by sensing the uncertain parameters and using an adaptive controller. ...
  • 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, ...
  • 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 ...
  • 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, ...