Ph.D. Theses: Recent submissions

  • Autonomus multi-robot topological spatial cognition 
    Karaoğuz, Hakan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    This thesis is concerned with topological spatial cognition in multi-robot systems. With topological reasoning, continuous space is discretized into a set of places that are spatially related. Thus, topological spatial ...
  • Modelling the population dynamics in a cell culture at two different scales 
    Habiboğlu, Mehmet Gökhan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    In this thesis the development of three novel models at two di erent scales are presented for population dynamics in cell cultures. Biological knowledge and empirical observations are used to design an agent-based discrete-time ...
  • Asynchronous sigma-delta analog to digital converters 
    Kayaaltı, Balkır. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    Analog to digital conversion is the process of translating analog real world signals to their corresponding binary encoded form which digital devices need. Among the examples for analog signal sources storage devices like ...
  • Design aspects of discrete time chaos based true random number generators 
    Çiçek, İhsan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    In this thesis, design aspects of discrete time chaos based cryptographic grade TRNGs are studied starting from chaotic map equations to in depth analyses of the generated entropy. Custom mathematical models of discrete ...
  • Realization and analysis of high performance physical unclonable functions based on ring oscillators 
    Kömürcü, Giray. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    Physical Unclonable Functions (PUFs) are powerful techniques that are proposed recently to address security related problems. They have a wide range of applications including cryptographic key generation and storage, ...
  • Ring oscillator based randon number generators 
    Güler, Ülkühan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    System-on-a-chip solutions require hardware based integrated circuit (IC) random number generator (RNG) for trustworthy transmission of information. Fully digital gate based IC RNGs became popular because of their uncomplicated ...
  • Single-channel speech-music separation for robust ASR with mixture of NMF models 
    Demir, Cemil. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    In this dissertation, we analyze the single-channel speech-music separation problem for automatic speech recognition (ASR). The motivation of the study is to increase the performance of the ASR systems by decreasing the ...
  • TYPE-4 fuzzy clustering for fuzzy modeling applications 
    Aras, Ayşe Çisel. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    In this study, a novel approach is described to the design of an interval type- 2 fuzzy neural system (IT2 FNS). It differs from the classical IT2 FNS in its use of parameterized conjunctors. In the optimization of the IT2 ...
  • Multiprocessor optimizations: |interconnection and task assignment 
    Erdim, Füsun. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1985., 1985.)
    Effective spreading of the use of muLtiprocessors, -or distributed processing in general-, and achieving the potential advantages of this new design option require various hardware and software-related probLems to be solved. ...
  • Development of new learning algorithms for spiking neural networks 
    Öniz, Yeşim. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    The main shortcomings with the gradient descent-based learning algorithms used for neural networks are that the convergence speed is relatively slow and the algorithm can be easily trapped into a local optimum. The studies ...
  • Modeling and simulation of interaction between light sources and living biological tissues 
    Çitkaya, Ahmet Yasin. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    The assessment of exposure level due to commonly used light sources needs specific attention in today's technology of lighting. The main reason behind this concern is that if exposure levels are not known, the biological ...
  • Convergence rate analysis and optimization of distributed consensus algorithms 
    Cihan, Onur. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    The problem of achieving a common value in a distributed information sharing context, referred to as distributed consensus or agreement, is an important topic that has drawn significant research attention of late. Consensus ...
  • Multirobot communication and task coordination 
    Bayram, Haluk. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    This thesis is concerned with multi-robot systems. Robots are increasingly being used in applications such as patrolling or exploration whose natures necessitate the consideration of multiple cooperating robots. The ...
  • CMOS based optoelectronic catheter localization system for magnetic resonance imaging environment 
    Sarıoğlu, Baykal. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    The use of minimally invasive medical techniques has greatly reduced risks to patients and has increased our understanding of how the body works. Detection of catheters is one of the most important tasks in these techniques. ...
  • Place recognition with an attentive robot 
    Erkent, Özgür. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    This thesis is concerned with robotic place recognition. From the robot’s perspective, the goal of place recognition is to determine its whereabouts - given its knowledge of places it has visited previously. This problem ...
  • Structured and sequential representations for human action recognition 
    Çeliktutan, Oya. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    Human action recognition problem is one of the most challenging problems in the computer vision domain, and plays an emerging role in various elds of study. In this thesis, we investigate structured and sequential ...
  • Multivariate modeling and diagnostic classification of pulmonary sounds 
    Şen, İpek. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    Computerized pulmonary sounds analysis has become prevalent in the recent decades as it provides means for quantitative and objective evaluation, contrary to the limited and subjective nature of stethoscope auscultation. ...
  • Novel results on frequency estimation and statistical characterization of three spectral estimation techniques 
    Anarın, Emin. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1985., 1985.)
    The problem of detecting a sinusoidal signal in white noise and estimati on of its parameters is essentially a problem in signal processing such as radar, sonar, biomedical, etc. In this dissertation, various modern spectrum ...
  • 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 ...
  • 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 ...

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