Fen Bilimleri Enstitüsü: Recent submissions

  • Study of the influence of unbalanced and wave form of the applied voltage systems on the output torque and asynchronous machine 
    Halıcı, Kemal. (Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1961., 1961.)
  • 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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • Fabrication and testing of polymer thin film transistors for basic digital circuits 
    Mert, Orhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis we developed fabrication and characterization methods for polymer thin lm transistors(PTFTs) and circuits. After analysis of the various aspects related to the PTFTs, we propose a new method to fabricate ...
  • 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 ...
  • 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 ...
  • 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) ...
  • 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. ...
  • Channel allocation system for wireless video communication in 802.11n MESH networks 
    Tekincan, Sinan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    With the latest technological achievements, wireless communication is spreading all around the world and entering into the daily life of individuals more. Especially with the development of 802.11n standard, high data rate ...
  • Design of M6800 based extendable, general purpose microcomputer 
    Ekinci, Firuzan. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.)
    The purpose of this thesis is the realization of a M6800 based extendable, self contained microcomputer system. A microcomputer is a microprocessor together with a memory and input/output channels for communication with ...
  • Design af active localization system front-end building blocks for MR-guided interventional procedures 
    Gerçek, İsmail. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In interventional procedures imaging plays an important role, as quick and accurate determination of the interventional device position and tissue structures are crucial for the procedure. Usually interventional procedures ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • 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 ...