Fen Bilimleri Enstitüsü: Recent submissions

  • Design of a PDA-based stethoscope for pulmonary sound parametrization and classification 
    Özdemir, Ömer Faruk. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Technological developments made in the near past, gave us a chance to analyze respiratory sounds quantitatively. Digitization of respiratory sounds, obviously, was the key in the analysis of respiratory sounds. Although ...
  • Second order sigma delta modulator architecture with low voltage swing at the output of the first integrator 
    Çakır, Necmettin Levent. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The technological improvements in digital Very Large Scale Integration (VLSI) circuits increase the need of analog digital converter with high performance and lower power consumption. Primarily, the oversampling techniques ...
  • Impulse radio ultra-wideband communication over free-space optical links 
    Davaslıoğlu, Kemal. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    A composite impulse radio ultra-wideband (IR-UWB) communication system is presented. The proposed system model aims to transmit UWB pulses over several kilometers through free-space optical (FSO) links and depending on the ...
  • Analysis of FXLMS algorithm for active noise control 
    Aytaç, Erdem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    With the increased number of industrial equipment and automation, acoustic noise problem become more and more evident, which has many negative effects on human health. This work is concerned with analysis of filtered - ...
  • True random number generation via sampling from band-limited Gaussian processes 
    Gov, Necmettin Caner. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    A true random number generator topology based on regular sampling of an "irregular" process is considered, which is obtained via thresholding a continuoustime Gaussian (normal) process, of which spectrum is assumed to be ...
  • Design of blocks for an ultra wireband transceiver 
    Akdağ, Evren. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Ultra wideband (UWB) is one of the strongest technologies for short-range high data rate and longer range low data rate communications. Wireless personal area networks are one example of the first group while wireless ...
  • Using sonar ears for robotic navigation 
    Erdem, Mustafa. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    This thesis presents work on previously developed hardware module for in-air ultrasound measurements and analysis. Redesigned hardware and firmware enable real-time ultrasound echo measurements which are then transmitted ...
  • Rom-Ram programmable digital IC tester 
    Sonlu, Yaşar. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.)
    In this thesis, the design of a ROM-RAM programmable digital IC tester by using a microcomputer system has been investigated. The tester is a compact automatic test instrument that interrogates the parametriC and functional ...
  • Multi-user communication over hybrid FSO UWB channels 
    Çağıral, Erman. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    UWB communication provides high data rates with a simple signal model over RF channels up to 10 meters. In literature, several studies have been done to generate and transmit UWB signals over optical carrier via fiber ...
  • Performance bounds on the localization of cellular phones using RSS measurements with unknown pathloss exponents 
    Sarı, Veli. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this thesis, performance of an Received Signal Strength (RSS) based location estimation model, which incorporates the antenna radiation pattern information into log-normal path loss the signal model is evaluated. ...
  • Power optimization and modeling of switched-capacitor integrators suitable for delta-sigma modulators 
    Evci, Gökhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this thesis, the power dissipation aspects of the Switched-Capacitor (SC) integrators used in Delta-Sigma ( ) modulators are treated. Delta-Sigma modulators which employ oversampling are one of the most critical types ...
  • Analysis of an averaging based synchronization algorithm in continuous-time 
    Ersöz, Didem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Synchronization in distributed networks plays a significant role in a broad range of applications that consist of mobile and/or wireless nodes which need to agree on a common notion of time to successfully fulfill the tasks ...
  • Mobility tracking algorithms for cellular networks based on Kalman filtering 
    Yeşilyurt, Alper. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    This thesis is an in depth theoretical and practical survey of dynamic mobility tracking systems specifically for cellular networks. A user mobility state model that is originally proposed for tracking targets in tactical ...
  • Automatic analysis of head and facial gestures in video streams 
    Akakın, Hatice Çınar. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Automatic analysis of head gestures and facial expressions is a challenging research area and it has significant applications for intelligent human-computer interfaces. An important task is the automatic classification of ...
  • A learning framework for robust hashing of face images 
    Şenel, Kamil. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Robust image hashing has been actively researched over the last decade with varied applications in image content authentication and identification under distortions. In the existing literature on robust image hashing, hash ...
  • 0-30V / 5A digital power supply with computer control 
    Sünetci, Önder. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Most of the electronic circuits require a DC power supply to operate. There are many designs and topologies covering different properties and specifications for DC power supplies. The voltage and current range and accuracy, ...
  • A steady state analysis of competitive prediction using LMMN combination 
    Soysal, Betül. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this thesis, the adaptive linear prediction of autoregressive signals under additive Gaussian noise model is investigated in a competitive algorithm framework. In this framework, there is a comparison class of predictors ...
  • Indexation, retrieval and decision techniques for spoken term detection 
    Can, Doğan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    Speech Retrieval (SR) systems aim to provide access to large multimedia archives that include a vast amount of spoken media like lecture videos, podcasts, news clips and audio books. To that end, SR integrates two well ...
  • Location based spectrum sensing in cognitive radio systems 
    Alimoğlu, Fernaz. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Cognitive radio is a promising solution to the spectrum utilization problem in time and space. One of the most critical points of cognitive radio is spectrum sensing. A reliable sensing is important for not disturbing the ...
  • Data acquisition system 
    İskit, Sabri Metin. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.)
    In this study several analog to digital converter systems are described and their advantages and disadvantages are told. Among them,a successive approximation type one is designed and buit.To obtain flexibility, it is ...

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