Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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Automated image reconstruction for non-cartesian magnetic particle imaging
(Bilkent University, 2019-09)Magnetic particle imaging (MPI) is a high-contrast imaging modality that images the spatial distribution of superparamagnetic iron oxide (SPIO) nanoparticles by exploiting their nonlinear response. In MPI, image ... -
Electrically unbiased and half frequency driven waterborne 16×16-element 2-D phased array CMUT
(Bilkent University, 2019-09)Capacitive micromachined ultrasonic transducers (CMUT) are typically used as arrays consisting of separate cells or interconnected sub arrays, and these cells have several operation modes. Design procedure and ... -
Design and analysis of metamaterial based perfect absorbers
(Bilkent University, 2019-09)Subwavelength light absorbers have an enormous potential on applications such as photodetection, optoelectronics, solar cells and sensing. Scaling down the device dimensions provides artificial and advanced properties. ... -
Adaptive ambulance redeployment via multi-armed bandits
(Bilkent University, 2019-09)Emergency Medical Services (EMS) provide the necessary resources when there is a need for immediate medical attention and play a signi cant role in saving lives in the case of a life-threatening event. Therefore, it is ... -
Measuring and improving interpretability of word embeddings using lexical resources
(Bilkent University, 2019-08)As an ubiquitous method in natural language processing, word embeddings are extensively employed to map semantic properties of words into a dense vector representations. They have become increasingly popular due to their ... -
Personalizing treatments via contextual multi-armed bandits by identifying relevance
(Bilkent University, 2019-08)Personalized medicine offers specialized treatment options for individuals which is vital as every patient is different. One-size-fits-all approaches are often not effective and most patients require personalized care ... -
Hybrid and model based approaches for new BCI spellers
(Bilkent University, 2019-07)Electroencephalography (EEG) based brain-computer interfaces (BCIs), due to their non-invasive, portable and temporal resolution properties, are widely used in the field of neural engineering. In order to make BCI paradigms ... -
Stability of third order conewise linear systems
(Bilkent University, 2019-08)A conewise linear, time-invariant system is a piecewise linear system in which the state-space is a union of polyhedral cones. Each cone has its own dynamics so that a multi-modal system results. We focus our attention ... -
Design and development of an SSVEP based low cost, wearable, and wireless BCI system
(Bilkent University, 2019-08)It has become a challenging research topic to design and develop cheap and wearable brain-computer interface (BCI) systems but not compromising the performance. In this thesis, the design and development of a steady state ... -
Efficient parameter mapping for magnetic resonance imaging
(Bilkent University, 2019-08)Balanced steady-state free precession (bSSFP) is a magnetic resonance imaging (MRI) sequence that enables high signal-to-noise ratios in short scan times. However, it has elevated sensitivity to main eld inhomogeneity, ... -
Universally polarization-insensitive achromatic metasurfaces
(Bilkent University, 2019-07)Transparent optical components constitute the key elements of modern electro-optical systems including optical sensors, displays and imaging systems. The working principle of conventional transparent components rely on ... -
Iterative fitting approach to CR-MREPT
(Bilkent University, 2019-07)Electrical properties (conductivity, and permittivity, ) imaging, reveals information about the contrast between tissues. Magnetic Resonance Electrical Properties Tomography (MREPT) is one of the electrical properties ... -
Metamaterials as broadband absorbers, tunable color filters, and multi-functional metasurfaces
(Bilkent University, 2019-07)Metamaterials have enabled us to come up with artificial structures and designs that can perform optical functionalities which are not achievable with natural materials. Here we design and implement three important ... -
Fair user scheduling for downlink power domain NOMA
(Bilkent University, 2019-07)Non-Orthogonal Multiple Access (NOMA) has been proposed as a new radio access technique in which multiple users (the case of user pairs or triples are covered in this thesis) are allowed to use the wireless channel ... -
Optical gain and lasing of colloidal semiconductor quantum wells intimately integrated into optical cavities
(Bilkent University, 2019-07)Colloidal semiconductor quantum wells, also known as nanoplatelets (NPLs), attract an increasingly greater deal of interest as a promising material platform for light-generating applications. The superior optical properties ... -
Design, fabrication, and characterization of normally-off GaN HEMTS
(Bilkent University, 2019-07)GaN-based high-electron-mobility transistors (HEMTs) have been developing rapidly from the time when they were first demonstrated in the 1990s. They have consistently been presented as a displacement technology to silicon ... -
Online anomaly detection with kernel density estimators
(Bilkent University, 2019-07)We study online anomaly detection in an unsupervised framework and introduce an algorithm to detect the anomalies in sequential data. We first sequentially learn the density for the observed data with a novel kernel based ... -
In-chip devices fabricated with nonlinear laser lithography deep inside silicon
(Bilkent University, 2019-06)The integration of photonic elements with electronic elements on the same chip is highly desirable, since it may lead to new generation of devices. One constraint in this direction is the limited space available on the ... -
Activity recognition invariant to position and orientation of wearable motion sensor units
(Bilkent University, 2019-04)We propose techniques that achieve invariance to the placement of wearable motion sensor units in the context of human activity recognition. First, we focus on invariance to sensor unit orientation and develop three ... -
Tailoring nonlinear temperature profile in laser-material processing
(Bilkent University, 2019-04)Ablation cooled material removal opened up great opportunities for understanding nonlinear processes. Especially using lasers as a tool to tailor nonlinear temperature gradient of material and engineering them to achieve ...
