Fen Bilimleri Enstitüsü: Recent submissions

  • 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 ...
  • Analog CMOS implementation of neuro-fuzzy systems 
    Sarıoğlu, Baykal. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In this thesis, a novel neuro-fuzzy system presented and implemented in analog CMOS. The system is based on the fact that a rule in a zero order TSK fuzzy system can be represented as an area on an input space which is ...
  • 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 ...
  • 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 ...
  • 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, ...
  • Digital filter design, error modeling and error correction in sigma-delta modulators 
    Genç, Necmiye. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Modern electronic systems that are used in computers, automotive, communication, etc., are mostly mixed-signal systems. To implement mixed-signal systems, it is necessary to convert analog signals into the digital domain ...
  • Estimation of basın detection and representation from non-linear system data 
    Habiboğlu, Mehmet Gökhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In this thesis, we are interested in a good qualititive representation of a nonlinear autonomous flow. It is assumed that the equations governing a given nonchaotic nonlinear autonomous flow are unknown. The only prior ...
  • Yet another simulation based sensitivity analysis tool for analog layout generation 
    Şen, Taşkın. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In this thesis, a high performance and flexible analysis tool is presented for computing the sensitivities of performance measures of analog integrated circuits to the parasitic effects that are introduced during layout ...
  • 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 ...
  • Current mode continuous time sigma delta converter design 
    Yapar, Ufuk. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Most sigma delta modulators are realized in the discrete-time domain using circuit techniques such as switched capacitor. In typical discrete time implementations, there are some speed constraints. For example, maximum ...
  • A dynamically clock-controlled binary stream cipher with memory and dynamic multiplexing "the mono stream cipher" 
    Uzun, Orçun. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Streams ciphers are appropriate for high speed encrypted communications because this type of ciphers provide high output speed and ease of implementation in hardware. Generally, stream ciphers makes use of Linear Feedback ...
  • Domain-specific keyword spotting 
    Haznedaroğlu, Ali. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In large vocabulary continuous speech recognition based keyword spotting applications, language modeling directly affects the system performance. In this study, a keyword adapted language model is proposed and a Turkish ...
  • Analysis of the compression techniques and memory bit effects on compression for pseudo-random generation 
    Seren, Ümit. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Compression of sequence is one of the most useful tools for strengthening the pseudo-random generators used in stream ciphers. Using compression components can prevent algebraic attacks against LFSR-based stream ciphers. ...
  • A study of infrared principles with emphasis on thermal detection 
    Demirelli, Atanur. (Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1969., 1969.)
    A survey of infrared principles is given in an attempt to determine the factors effecting the performance of infrared detection system. Various detection phenomena are discussed in a comparative manner. A full treatment ...
  • A new nonlinear combination generator "myboun" 
    Özgan, Meltem Doğaner. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In cryptographic systems, usually linear feedback shift register based keystream generators are used because of the fact that they can produce sequences with large period, good statistical properties. They are suitable for ...

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