Fen Bilimleri Enstitüsü: Recent submissions

  • 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 ...
  • Stable - matching based resource allocation methods in wireless communication systems 
    Sabuncu Sandal, Yağmur. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    As the number of smart devices increases day by day, the need for new resource allocation techniques also increases. 5G technologies such as Long-Term Evolution Advanced (LTE-A), carrier aggregated heterogeneous networks ...
  • Novel signal processing techniques for fiber optic distributed acoustic sensing 
    Ölçer, İbrahim. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    In this thesis, to reduce the effect of noise in phase-sensitive optical time domain based (φ-OTDR) distributed acoustic sensing (DAS) systems, two novel approaches are proposed and a real experimental φ-OTDR system is ...
  • Unsupervised learning of word alignments for statistical machine translation 
    Mermer, Coşkun. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Word alignment is a crucial first step in learning statistical translation models. In this dissertation, we propose a Bayesian approach to unsupervised learning of word alignments by introducing a sparse prior on the ...
  • Molecular communication in diffusion based channel 
    Akdeniz, Bayram Cevdet. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    This thesis deals with diffusion based molecular communication. Unlike conven tional communication systems, the information is encoded with molecules and these molecules are emitted by nanodevices in a diffusive environment. ...
  • Magnetically actuated MEMS scanners for laser scanning confocal microscopy 
    Oyman, Hilmi Artun. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Magnetically actutated micro-scanners are fabricated via three-dimensional (3D) printingandlasermachiningtechnologiestouseinalaserscanningconfocalmicroscopy application. First, a 3D printed polymer based scanning mirror ...
  • Keyword search for low resource languages 
    Gündoğdu, M. Batuhan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    Retrieval of spoken content is one key endeavor, not only for finding the speech parts of interest, but also for an automated and facilitated speech mining towards better automatic speech recognition (ASR) systems. In ...
  • 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 ...
  • 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 ...
  • Realization and modeling of water-gated field effect transistors (WG-FET) using 16-NM-THICK single crystalline silicon film and their circuit applications 
    Sönmez, Bedri Gürkan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    This thesis covers realization and modeling of novel water-gated field effect transistors (WG-FETs) which use 16-nm-thick single crystalline silicon lm as active layer. WG-FET devices utilize electrical double layer ...
  • Supervised, semi-supervised and unsupervised methods in discriminative language modeling for automatic speech recognition 
    Dikici, Erinç. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    Discriminative language modeling aims to reduce the error rates by rescoring the output of an automatic speech recognition (ASR) system. Discriminative language model (DLM) training conventionally follows a supervised ...
  • Time - frequency and time - scale analysis, decomposition and classification of adventitious pulmonary sounds 
    Ulukaya, Sezer. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    Pulmonary diseases a ect the quality of life and disturb the patients throughout their life. Due to some disadvantages of auscultation with a traditional stethoscope, computerized lung sound analysis has become a necessity. ...
  • 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. ...
  • Content based medical image retrieval 
    Marvasti, Neda Barzegar. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    Fast technological developments of di erent medical imaging and data collection techniques increase the expectation of more accurate interpretations and diagnoses of radiologists. However, to carefully analyze the resulting ...
  • Analog circuit design automation against process variations and aging phenomena 
    Afacan, Engin. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    Reliability of CMOS circuits has become a major concern due to substantially worsening process variations and aging phenomena in deep sub-micron devices. As a result, conventional analog circuit sizing tools have become ...
  • Consensus based power control algorithms for heterogenous networks 
    Şenel, Kamil. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    The resource allocation problem is crucial for unveiling the potential of heterogeneous networks. The demand for higher data rates from an increasing number of devices compels the operators to look for solutions beyond the ...
  • Standard cell all-digital phase locked loop design, analysis and high-level synthesis 
    Balcıoğlu, Yalçın. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    This thesis presents a new quantization noise suppression method for a timeto- digital Converter (TDC) and proposes an all-digital phase locked loop (ADPLL) architecture using only standard cell logic gates. Using new ...
  • 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) ...
  • Channel polarization with higher - order memory 
    Afşer, Hüseyin. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    Channel coding is one of the most fundamental problems regarding the nature of communication. Polar codes, developed by Ar kan, were the rst demonstration of practical channel codes that provably achieve theoretical limits ...

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