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Browsing Elektrik- Elektronik Mühendisliği by Issue Date

Browsing Elektrik- Elektronik Mühendisliği by Issue Date

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  • Density-based shape descriptors and similarity learning for 3D object retrieval 
    Akgül, Ceyhun Burak. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Next generation search engines will enable query formulations, other than text, relying on visual information encoded in terms of images and shapes. Content-based retrieval research aims at developing search engines that ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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. ...
  • 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 ...
  • Advanced transceiver design for continuous phase modulation 
    Özgül, Barış. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    This dissertation proposes advanced transceiver designs applying turbo and space-time (ST) concepts to continuous phase modulation (CPM), which is preferred in numerous power- and band-limited communication systems for its ...
  • 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, ...
  • High level modeling of sigma-delta analog to digital converters 
    Talay, Selçuk. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    This thesis discuss high-level modeling of Sigma-Delta ADC’s, development of a design automation tool which operates at system level, and other related software which are required for accurate operation of this tool. There ...
  • 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 ...
  • 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 ...
  • LMI formulations for a class of nonconvex quadratic programming problems 
    Yıldıran, Uğur. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Finding the optimal value of a polynomial function over a region determined by a finite number of polynomial constraints and determining the emptiness of such a region constitute major problems encountered in control theory ...
  • High level power efficient synthesis of FIR based digital systems 
    Aktan, Mustafa. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Digital filters are the most frequently used elements in signal processing applications. Among digital filters, FIR filters are preferred due to their stability, easily achievable linear-phase property, and low quantization ...
  • 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 ...
  • 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 ...
  • Analog circuit optimization with hierarchical genetic algorithms - 3rd order low-pass butterworth filter example 
    Azeri, Olcay Durul. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In the several previous studies, various kinds of Hierarchical Genetic Algorithm structures have been used to solve complex problems. In this thesis, a master-slave mode, two-layered Hierarchical Genetic Algorithm was ...
  • Location based spectrum sensing in cognitive radio systems 
    Alimoğlu, Fernaz. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Cognitive radio is a promising solution to the spectrum utilization problem in time and space. One of the most critical points of cognitive radio is spectrum sensing. A reliable sensing is important for not disturbing the ...
  • Multiple input multiple output transmission techniques and link adaptation in wireless systems with dual-polarized antennas 
    Kılıç, Yakup. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The use of dual-polarized antennas theoretically double the number of virtual antennas used in the system. On the other hand, the correlation effects and the crosspolar discrimination (XPD) deteriorates the system performance. ...
  • 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, ...

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