Browsing Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D. by Title
Now showing items 46-65 of 132
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Gain variation and noise figure degradation in balanced amplifiers
(Bilkent University, 2017-07)Although using balanced amplifiers in modern wireless communication systems has many advantages, the output and the noise response of the balanced ampli- fiers may vary from the expected value considerably due to the ... -
Generalized filtering configurations with applications in digital and optical signal and image processing
(Bilkent University, 1999)In this thesis, we first give a brief summary of the fractional Fourier transform which is the generalization of the ordinary Fourier transform, discuss its importance in optical and digital signal processing and its ... -
High throughput decoding methods and architectures for polar codes with high energy-efficiency and low latency
(Bilkent University, 2017-11)Polar coding is a low-complexity channel coding method that can provably achieve Shannon’s channel capacity for any binary-input discrete memoryless channels (B-DMC). Apart from the theoretical interest in the subject, ... -
High-performance AlxGA1-xN-Based UV photodetectors for visible/solar-blind applications
(Bilkent University, 2004)High-performance detection of ultraviolet (UV) radiation is of great importance for a wide range of applications including flame sensing, environmental (ozone layer) monitoring, detection of biological/chemical ... -
Identification of legged locomotion via model-based and data-driven approaches
(Bilkent University, 2017-05)Robotics is one of the core areas where the bioinspiration is frequently used to design various engineered morphologies and to develop novel behavioral controllers comparable to the humans and animals. Biopinspiration ... -
Image coding for digitized libraries
(Bilkent University, 1998)III this thesis, image coding methods for two basic image types are developed under a digitized library framework. The two image types are gray tone or color images, and binary textual images, which are the digitized image ... -
Image deconvolution methods based on fourier transform phase and bounded energy
(Bilkent University, 2018-08)We developed deconvolution algorithms based on Fourier transform phase and bounded energy. Deconvolution is a major area of study in image processing applications. In general, restoration of original images from noisy ... -
Implantable SUB-cm wireless resonators For MRI: from circuit theory to medical imaging
(Bilkent University, 2018-01)Making implantable wireless resonators having small footprints is fundamentally challenging when using conventional designs that are subject to the inherent tradeo between their size and the achievable range of ... -
Implementation of a broadband multilevel fast multipole algorithm for multiscale electromagnetics problems
(Bilkent University, 2016-06)Fast multipole method (FMM) in computational physics and its multilevel version, i.e., multilevel fast multipole algorithm (MLFMA) in computational electromagnetics are among the best known methods to solve integral equations ... -
Innovative modular and arrayed coil systems for ultrahigh efficiency in inductive heating and automated metal detection
(Bilkent University, 2017-01)Induction systems have become increasingly more important and popular in our modern world and their application areas have widely expanded because of their high levels of safety and controllability. Today one important ... -
Intelligent sensing for robot mapping and simultaneous human localization and activity recognition
(Bilkent University, 2011)We consider three different problems in two different sensing domains, namely ultrasonic sensing and inertial sensing. Since the applications considered in each domain are inherently different, this thesis is composed ... -
İnvestigation, modeling, and applications feasibility of the thermal crosstalk in high Tc transition edge bolometer arrays
(Bilkent University, 2006)So far, the high Tc transition edge bolometer (TEB) devices are mostly used as single pixel detectors. Recently, there are a number of groups working on the 2-4 pixel array applications of the high Tc TEB. Though the ... -
Laser wavelength upconversion with optical parametric oscillators using simultaneously phase-matched crystals
(Bilkent University, 2002)In this thesis, we present our work on optical parametric oscillators that employ a single nonlinear crystal that is simultaneously-phase-matched for second-harmonic or sum-frequency generation in order to obtain frequency ... -
Linear quadratic control for harmonic signals
(Bilkent University, 2001) -
Local signal decomposition based methods for the calculation of three-dimensional scalar optical diffraction field due to a field given on a curved surface
(Bilkent University, 2013)A three-dimensional scene or object can be optically replicated via the threedimensional imaging and display method holography. In computer-generated holography, the scalar diffraction field due to a field given on an ... -
Low-frequency conductivity imaging using MRI gradient induced currents
(Bilkent University, 2016-09)Due to the switching of Magnetic Resonance Imaging (MRI) gradient fields, electric fields are induced in imaged subjects which give rise to `subject eddy currents'. The feasibility of low-frequency conductivity imaging ... -
Lumped element modeling of circular CMUT in collopsed mode
(Bilkent University, 2014)Capacitive micromachined ultrasonic transducer is a microelectromechanical device, which serves as an acoustic signal source or sensor, in a variety of applications including medical ultrasound imaging, ultrasound therapy, ... -
Magnetic resonance technologies based on reverse polarization for image-guided interventions
(Bilkent University, 2010)In this PhD dissertation, we presented four magnetic resonance (MR) technologies established upon reverse polarization for image guided interventions. The first three studies are based on tracking interventional devices, ... -
Maximum likelihood estimation of robust constrained Gaussian mixture models
(Bilkent University, 2013)Density estimation using Gaussian mixture models presents a fundamental trade off between the flexibility of the model and its sensitivity to the unwanted/unmodeled data points in the data set. The expectation ... -
Metasurface microlens focal plane arrays and mirrors
(Bilkent University, 2017-02)Lenses, mirrors and focal plane arrays (FPAs) are among the key components a ecting the functionality, performance and cost of electro-optical (EO) systems. Conventional lenses rely on phase accumulation mechanism for ...
