Browsing Ph.D. Theses by Title

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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 ...
  • 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 ...
  • Design of high efficiency switching converters for mobile applications 
    Ozanoğlu, Kemal. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    High power efficiency is a key design specification in mobile applications, mainly to increase battery life. To answer this need, switching converters are preferred in such applications to convert the battery voltage to ...
  • 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 ...
  • Design of multidimensional perfectreconstruction filter banks with compression applications 
    Celasun, Işıl. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1996., 1996.)
    The acoustics, vibration, tacho voltage (tacho is a part of the universal motor used to get a feedback from the motor to control the speed), feeding voltage and the supply current signals reflect the health of the motor. ...
  • Design, fabrication and characterization of micromachined THz absorbers 
    Mamaghani, Ayda. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    The purpose of this research is to develop a new class of THz absorbers for imaging and sensing applications that can provide improved functionality and perfor mance. These absorbers consist of periodic arrays of layered ...
  • Development of a high level synthesis tool specialized on fir-based multirate systems 
    Yurdakul, Arda. (Thesis (Ph.D.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1999., 1999.)
    Digital Signal Processing (DSP) is the most studied area in design automation, because it is one of the most well-established branches of electrical engineering for several years. In the last few years, it is stimulated ...
  • 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 ...
  • Distributed group consensus in multi - agent networks 
    Erkan, Özlem Feyza. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    Recent advances in computing and communication technologies have led to considerable progress in multi-agent networks. A variety of applications ranging from social networks to intelligent transportation systems makes the ...
  • Electronic tunability in analog filters 
    Metin, Bilgin. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    In the beginning years of the analog design, discrete components were being used in the analog design procedures. After manufacturing, trimmer capacitors and potentiometers were used for electronic tunability to compensate ...
  • Energy harvesting wireless optical microsystems 
    Haydaroğlu, İskender. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    This thesis covers a novel approach to photovoltaic energy harvesting and optical data transmission in the context of millimeter-scaled smart autonomous microsystems through the use of a single light emitting diode (LED) ...
  • Enhanced layout-aware circuit / ststem synthesis 
    Unutulmaz, Ahmet. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    This thesis presents the layout description script (LDS) which is suitable to be used within a template synthesizing layout aware circuit synthesis loop. LDS is a hybrid programming language supporting both sequential and ...
  • Equivalence checking of designs modeled in simulink implemented in low level 
    Sağlamdemir, Muharrem Orkun. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    We propose methodologies for checking the equivalence of analog and digital Simulink models and their low level implementations. For digital methodology, we develop a flow utilizing commonly used tools used in digital ...
  • Error mitigation in next generation Nand flash memories 
    Ashrafi, Mahmood Reza Alizadeh. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    The rapid developments and deployments in the global market of digital con sumer electronics in the last decade have stimulated the universal research on the dig ital storage technologies. NAND flash memory, fabricated based ...
  • Estimating biological changes in human by different markers from RF exposure using modeling and measurements 
    Uluaydın, Niyazi Korkut. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    This thesis dissertation reviews the works of academia on natural occurring electrical, magnetic, and electromagnetic (EM) phenomena and their subtle relations with living organisms. It also investigates the artificial ...
  • Finite element method with weighted extended b-splines for electromagnetics 
    Apaydın, Gökhan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    This thesis presents fundamental overview of electromagnetics and finite element method (FEM) with weighted extended basis splines (web-splines), which is a new developed finite element method for electromagnetic problems. ...
  • 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 ...
  • 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 ...
  • Improving the error floor performance of LDPC codes 
    Sarıduman, Abdullah. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    Low-density parity-check codes (LDPC) have become one of the most popular error-correcting code families in recent years due to their high error correction performance and easy implementation. They became one of the biggest ...
  • 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 ...

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