Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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Event-triggered distributed estimation with reduced communication load
(Bilkent University, 2017-02)We propose a novel algorithm for distributed processing applications constrained by the available communication resources using diffusion strategies that achieves up to a 103 fold reduction in the communication load over ... -
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 ... -
Biased competition in semantic representations across the human brain during category-based visual search
(Bilkent University, 2017-01)Humans can perceive thousands of distinct object and action categories in the visual scene and successfully divide their attention among multiple target categories. It has been shown that object and action categories are ... -
Probing viscosity via relaxation in magnetic particle imaging
(Bilkent University, 2017-01)Magnetic Particle Imaging (MPI) is a high-contrast imaging modality with applications such as angiography, stem cell tracking, and cancer imaging. In recent years, MPI was shown to be a potential functional imaging modality ... -
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 ... -
H∞ Filter based target tracking under time delayed measurements
(Bilkent University, 2005-09)In this thesis target traking problem for time delayed linear systems is studied. The standard mixed sensitivity problem is considered with time delayed continuous time processes. Using the duality between control and ... -
A modified wideband Gysel power divider structure
(Bilkent University, 2016-12)Power dividers/combiners are one of the essential and crucial components of the modern RF communication systems since dividing makes RF power amplification easier to handle. As the data rates of the systems increase, the ... -
Randomized convolutional and concatenated codes for the wiretap channel
(Bilkent University, 2016-11)Wireless networks are vulnerable to various kinds of attacks such as eavesdropping because of their open nature. As a result, security is one of the most important challenges that needs to be addressed for such networks. ... -
Secrecy rates of finite-input intersymbol interference channels
(Bilkent University, 2016-11)Due to the broadcast nature of the communication medium, security is a critical problem in wireless networks. Securing the transmission at the physical layer is a promising alternative or complement to the conventional ... -
Development and implementation of SBR technique for scattering and RCS problems
(Bilkent University, 2016-10)Full wave solution techniques are preferred to calculate the electromagnetic characteristic of an object. These methods give very accurate results. However, when the object is electrically large regarding wavelength, ... -
Development of femtosecond infrared fiber laser for multiphoton silicon micromachining
(Bilkent University, 2016-10)Femtosecond laser is widely used in material processing. Application of ultrashort lasers makes it possible to process with higher precision compared to picosecond and nanosecond lasers. Moreover, a major challenge in ... -
Multichannel and phase based magnetic resonance electrical properties tomography
(Bilkent University, 2016-09)Imaging of electrical properties (EPs, i.e. conductivity and dielectric permittivity) of tissues give valuable information about the physiological and pathological conditions of tissues. Among the EP imaging modalities, ... -
Signal detection theory analysis of category-based visual search in natural movies
(Bilkent University, 2016-09)The human brain changes its inner hierarchy and connection strength between the neurons in order to apprehend the real world. In visual search, It is thought that the human brain changes the sensitivity of neurons in the ... -
Dynamic resource allocation and activity management for improving energy efficiency and fairness in 5G heterogeneous networks
(Bilkent University, 2016-09)The higher energy consumption of Heterogeneous Networks (HetNet) compared to Macro Only Networks (MONET) raises a great concern about the energy e ciency of HetNets. In this thesis a dynamic activation strategy is ... -
Foraging motion of swarms as nash equilibria of differential games
(Bilkent University, 2016-09)The question of whether foraging swarms can form as a result of a non-cooperative game played by individuals is shown here to have an affirmative answer. A dynamic (or, differential) game played by N agents in one-dimensional ... -
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 ... -
Classification of vessel acoustic signatures using non-linear scattering based feature extraction
(Bilkent University, 2016-09)This thesis proposes a vessel recognition and classification system based on acoustic signatures. Conventionally, acoustic sounds are recognized by sonar operators who listen to audio signals received by ship sonars. The ... -
Regenerator placement in elastic optical networks with adaptive modulation and coding
(Bilkent University, 2016-09)Due to the rapid and diverse increase in the tra c load on the optical networks, e cient utilization of the network resources becomes an important issue. Using di erent modulation formats and coding rates in optical ... -
Tunable graphene plasmonic structures with different gating schemes
(Bilkent University, 2016-08)The aim of this thesis is to examine graphene plasmonic structures which yields actively tunable spectral resonances and compare two different ways to gate graphene. Plasmonic structures that consist of periodic fractal ... -
Inter-regional connectivity in the human brain during visual search
(Bilkent University, 2016-08)Separate groups of regions in the human brain are thought to be functionally specialized for representing specific categories of visual objects, and for controlling and deployments of visual attention. It is commonly ...
