Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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Adaptive energy management for solar energy harvesting wireless sensor nodes
(Bilkent University, 2018-09)Wireless Sensor Networks (WSN) will have a key role in the upcoming era of the Internet of Things (IoT) as they will be forming the basis of communication infrastructure. Energy harvesting has been a widely used instrument ... -
Queuing analysis of the energy-delay trade-off in wireless networks
(Bilkent UniversityBilkent University, 2018-09)Energy-efficiency of wireless communication systems has been an important research topic in recent years. For such a system, a transmission profile is described by the transmission power and the modulation and coding ... -
Development and characterization of a direct detection fiber optic distributed acoustic sensor
(Bilkent University, 2018-09)Phase-sensitive optical time domain re ectometer (ø-OTDR) based distributed acoustic sensor (DAS) systems have attracted increasing attention in recent years due to their remarkable advantages in a wide range of industrial ... -
Improvement and comparison of complex B₁ mapping techniques for use in MREPT
(Bilkent University, 2018-09)Impedance imaging, (i.e., conductivity, , and permittivity, ) provides helpful information about contrast between healthy and malignant tissues. As one of the impedance imaging techniques, Magnetic Resonance Electrical ... -
Experimental and model based investigation of the effects of high stimulus presentation rate on code-modulated visual evoked potential based brain-computer interfaces
(Bilkent University, 2018-09)Objective. Previous studies on code-modulated visual evoked potentials (c- VEP) have yielded important results regarding the performance of c-VEP based brain-computer interfaces (BCIs) in recent years. Since, speed is ... -
Visible light positioning systems: fundamental limits, algorithms and resource allocation approaches
(Bilkent University, 2018-09)Visible light communication (VLC) is an emerging paradigm that enables multiple functionalities to be accomplished concurrently, including illumination, highspeed data communications, and localization. Based on the VLC ... -
Improved artificial neural network training with advanced methods
(Bilkent University, 2018-09)Artificial Neural Networks (ANNs) are used for different machine learning tasks such as classification, clustering etc. They have been utilized in important tasks and offering new services more and more in our daily ... -
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 ... -
Signaling games in networked systems
(Bilkent University, 2018-08)We investigate decentralized quadratic cheap talk and signaling game problems when the decision makers (an encoder and a decoder) have misaligned objective functions. We first extend the classical results of Crawford and ... -
User grouping in wireless networks with full duplex base stations and legacy mobile stations
(Bilkent University, 2018-08)Improving spectral efficiency is a key objective in next generation wireless networks. Recent advances in self-interference cancellation techniques made in-band full-duplex wireless communications possible. Unlike ... -
Low convective field artifact elimination using dielectric padding and multichannel receive in cr-MREPT conductivity images
(Bilkent University, 2018-08)Imaging the electrical conductivity of the tissues in RF frequencies is an important tool for medical diagnostic purposes along with the local specific absorption rate estimation that is closely related to MR safety ... -
Design, implementation and construction of an eight channel RF TEM array and its use in MR-EPT
(Bilkent University, 2018-08)Magnetic Resonance - Electrical Properties Tomography, aiming at reconstructing the electrical properties (EPs) at radio frequencies, has a continuously increasing importance in terms of identifying the cancerous tissues ... -
Power allocation strategies for channel switching and wireless localization
(Bilkent University, 2018-08)Optimal power allocation is an important approach for enhancing performance of both communication and localization systems. In this dissertation, optimal channel switching problems are investigated for average capacity ... -
Optimization Of collapsed mode CMUT receiver for maximum off-resonance sensitivity
(Bilkent University, 2018-07)Capacitive Micromachined Ultrasonic Transducer (CMUT) has a flexural conductive plate suspended over a fixed substrate with metal electrode deposited over it. This circular suspended plate is fixed at the rim but is free ... -
Experimental and model based investigation of period doubling phenomenon in human steady state visual evoked potential responses
(Bilkent University, 2018-08)Objective. Previous human Steady State Visual Evoked Potential (SSVEP) experiments have yielded different results regarding the range of stimulus frequencies in which Period Doubling (PD) behavior is observed. There also ... -
On mixed H2=H∞ controller design for systems with time delay
(Bilkent University, 2018-07)This study discusses mixed H2=H∞ controller design problem for uncertain Linear Time-Invariant (LTI) systems with a time delay. More precisely, the goal is to find an internally stabilizing controller that minimizes ... -
Colloidal photonics of semiconductor nanocrystals: from polarized color conversion to efficient solar concentration
(Bilkent University, 2018-07)Effective photon management is pivotal to the success of future photonic applications. The demand for high-performance electronic displays and solar light harvesters has been increasingly growing, ever with high expectations ... -
Transformation techniques from scalar wave fields to polarized optical fields for wide-viewing-angle holographic displays
(Bilkent University, 2018-07)Although the optical waves are vector-valued electromagnetic waves in nature, in holographic three-dimensional television (3DTV) research, an optical eld to be displayed is usually modeled as a scalar wave eld. In this ... -
Multiphysics modeling of Ge2Sb2Te5 based synaptic devices for brain inspired computing
(Bilkent University, 2018-07)Modeling nanoscale devices that emulate the functionality of synapses of the biological brain is a fundamental operation for developing brain-inspired computational systems. Phase-change material based synaptic devices ... -
Online learning with recurrent neural networks
(Bilkent University, 2018-07)In this thesis, we study online learning with Recurrent Neural Networks (RNNs). Particularly, in Chapter 2, we investigate online nonlinear regression and introduce novel regression structures based on the Long Short ...
