Browsing Ph.D. Theses by Issue Date

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  • 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 ...
  • 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 ...
  • Achievable rates and transceiver design in ultra-wideband communications 
    Güney, Nazlı. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In a multipath dominated environment, ultra-wideband (UWB) systems that transmit trains of subnanosecond duration pulses exhibit the desirable property of fine resolution in time of the received paths, which as a result ...
  • Statistical and discriminative language modeling for Turkish large vocabulary continuous speech recognition 
    Arısoy, Ebru. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Turkish, being an agglutinative language with rich morphology, presents challenges for Large Vocabulary Continuous Speech Recognition (LVCSR) systems. First, the agglutinative nature of Turkish leads to a high number of ...
  • Object recognition in subspaces: applications in biometry and 3D model retrieval 
    Dutağacı, Helin. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Shape description is a crucial step in many computer vision applications. This thesis is an attempt to introduce various representations of two and three dimensional shape information. These representations are aimed to ...
  • Circuit level analog design automation 
    Sönmez, Özsun Serkan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    This thesis presents a simulation-based analog circuit synthesis methodology, its integration with system and layout level analog synthesis tools, and synthesis examples that were performed to validate the usefulness of ...
  • Low-voltage low-power design and implementation of current-mode circuits 
    Çakır, Cem. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Low-voltage and low-power analog and digital circuits are needed to realize batteryoptimized, reliable and low-cost electronic devices for many applications. Example applications include remote environmental monitoring, ...
  • A generalized pareto front approach for performance estimation in analog design automation systems 
    Deniz, Engin. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The design of analog circuits requires a deep insight into both physical and technological parameter interactions. In addition, every application of analog circuits has speci c constraints and requirements with large number ...
  • Design of low noise CCII based current mode circuits to be used in high frequency applications 
    Arslan, Emre. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    High performance analog circuits need to be modified according to modern telecommunication needs such as higher frequency (GHz regions), low power, low voltage, low noise and higher relative dynamic range. The attractive ...
  • Alternative arithmetic structures using redundant numbers and multi-valued circuit techniques 
    Çini, Uğur. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Arithmetic circuits play a crucial role in VLSI technology. Arithmetic blocks are usually the most power consuming parts in a system since the switching activity is quite high. Alternative arithmetic implementations can ...
  • The design aspects of an optically powered CMOS receiver front-end for electrically isolated applications 
    Aktan, Ozan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    The receiver circuitry in a wireless communication system is a key component in determining the overall system performance. The power of the receiver circuitry is usually provided from a battery or through copper wires. ...
  • Realization of two dimensional MEMS based displays using polymer composite micro-scanners integrated with one dimensional polymer LED arrays 
    Gökdel, Yiğit Dağhan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    A novel type of displays are realized by hybrid and monolithic integration of optoelectronic devices with micro electro mechanical systems (MEMS). MEMS platform, with mechanical quality factor (20-50 in air) enhanced ...
  • Web-splines solution of 3D electromagnetic problems 
    Kunter, Fulya. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    This dissertation proposes the weighted extended basis splines (web-splines) approach in the finite element method (FEM) for electrostatic, electromagnetic, and bioheat problems for radially symmetric and three dimensional ...
  • Interval type-2 fuzzy logic systems: theory and design 
    Kayacan, Erdal. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    This Ph.D. dissertation has four main objectives. Firstly, the noise reduction property of type-2 fuzzy logic systems that use a novel type-2 fuzzy membership function is studied. A number of papers exist in literature ...
  • Non-rigid registration-based data-driven 3D facial action unit detection 
    Savran, Arman. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    Automated analysis of facial expressions has been an active area of study due to its potential applications not only for intelligent human-computer interfaces but also for human facial behavior research. To advance automatic ...
  • Broadband power-line noise modeling and compensation 
    Güzel, Tayyar. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    Broadband power-line communication (BPLC) has become more popular in the Smart Grid context as it allows broadband access, media sharing, automated meter reading etc. However, it still remains as a challenging task to ...
  • Telephone-based text-dependent speaker verification 
    Büyük, Osman. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    In this thesis, we investigate model selection and channel variability issues on telephone-based text-dependent speaker verification applications. Due to the lack of an appropriate database for the task, we collected two ...
  • Security and privacy analysis of authentication protocols in RFID systems 
    Ergüler, İmran. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    Radio Frequency IDentification (RFID) technology continues to flourish as an inherent part of virtually every ubiquitous environment. However, it became clear that the public— implying the industry— seriously needs mechanisms ...
  • Current-model CMOS sequential multiple-valued logic circuits 
    Sarıca, Fatma. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    The use of circuits with more than two logic levels, named as Multiple-Valued Logic (MVL) circuits, have a potential for reducing chip area consumed by interconnection wiring and functional units in Very-Large Scale ...

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