Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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Algorithms and regret bounds for multi-objective contextual bandits with similarity information
(Bilkent University, 2019-01)Contextual bandit algorithms have been shown to be e ective in solving sequential decision making problems under uncertain environments, ranging from cognitive radio networks to recommender systems to medical diagnosis. ... -
Design and applications of A Z-gradient array in magnetic resonance imaging
(Bilkent University, 2019-01)Array of gradient coils driven by independent power amplifiers can generate gradient fields with dynamically changing gradient field profiles. Nine channel prototype z-gradient coil array with a diameter of 25 cm is ... -
Prediction with expert advice: on the role of contexts, bandit feedback and risk-awareness
(Bilkent University, 2018-12)Along with the rapid growth in the size of data generated and collected over time, the need for developing online algorithms that can provide answers without any offline training has considerably increased. In this thesis, ... -
Low complexity efficient online learning algorithms using LSTM networks
(Bilkent University, 2018-12)In this thesis, we implement efficient online learning algorithms using the Long Short Term Memory (LSTM) networks with low time and computational complexity. In Chapter 2, we investigate efficient covariance information-based ... -
Load balancing enhancements to the routing protocol for low power and lossy networks in the internet of things
(Bilkent University, 2018-12)The internet today is shifting from the Internet of people to the Internet of Things (IoT). Particularly, in IoTs, wireless sensors connect edge devices to the Internet via a gateway that provides connectivity between ... -
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 ...
