Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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Optimization and machine learning in MRI: applications in rapid MR image reconstruction and encoding models of cortical representations
(Bilkent University, 2020-03)Magnetic Resonance Imaging (MRI) is a non-invasive medical imaging modality that is widely used by clinicians and researchers to picture body anatomy and neuronal function. However, long scan time remains a major problem. ... -
Cost constrained sensor selection and design for binary hypothesis testing
(Bilkent University, 2020-03)We consider a sensor selection problem for binary hypothesis testing with costconstrained measurements. Random observations related to a parameter vector of interest are assumed to be generated by a linear system corrupted ... -
Analytical model and design of load modulated balanced amplifier
(Bilkent University, 2020-02)RF power amplifiers (PA) with high efficiency and linearity are in high demand for modern communication systems. Modulated signals having a high peakto-average power ratio (PAPR) require PA’s to maintain these features in the ... -
New approach for designing cVEP BCI stimuli based on superposition of edge responses
(Bilkent University, 2020-01)Electroencephalography (EEG) based brain-computer interfaces (BCIs) are widely used in the field of neural engineering, due to their portability, noninvasive nature, and high temporal resolution properties. Among the different ... -
Rapid reconstruction for parallel magnetic resonance imaging with non-Cartesian variable-density sampling trajectories
(Bilkent University, 2020-02)Due to long acquisition times, the use of magnetic resonance imaging (MRI) remains challenging in some applications. Variable-density acquisitions enable scan acceleration while maintaining a desirable trade-off between ... -
Optimization of coupled Class-E RF power amplifiers for a transmit array system in 1.5T MRI
(Bilkent University, 2020-02)Radio Frequency (RF) field is generated mostly by linear RF power amplifiers in Magnetic Resonance Imaging (MRI). These amplifiers have relatively low efficiency and are placed far from the transmit coil in MRI system room. ... -
Distributed caching and learning over wireless channels
(Bilkent University, 2020-01)Coded caching and coded computing have drawn significant attention in recent years due to their advantages in reducing the traffic load and in distributing computational burden to edge devices. There have been many research ... -
Zone based GLRT for detecting physical random access channel signals in 5G
(Bilkent University, 2020-01)In LTE/5G systems, the random access channel (RACH) process occurs during the boot-up phase. As channel state information is not available at this stage, detecting several devices with high performance presents a challenging ... -
Optimal parameter encoding strategies for estimation theoretic secure communications
(Bilkent University, 2019-12)Physical layer security has gained a renewed interest with the advances in modern wireless communication technologies. In estimation theoretic security, secrecy levels are measured via estimation theoretic tools and ... -
Design and implementation of a general purpose median filter unit in VLSI
(Bilkent University, 1988-10)The median of a group, containing an odd number of elements, is defined as the middle element, when the elements of the group are sorted. A median filter finds the median of a number of elements at its inputs. Median filters ... -
Code design for interference channels
(Bilkent University, 2019-11)As the number of wireless devices dramatically increases, they experience more interference in their communications. As a result, managing interference in wireless networks is an important challenge in future wireless ... -
An analog neuromorphic classifier chip for ECG arrhythmia detection
(Bilkent University, 2019-10)Following Moore's Law, the increase in the availability of more processing power alongside the development of algorithms that can use this power, electrocardiogram (ECG) systems are now becoming a part of our daily lives. ... -
Non-uniformly sampled sequential data processing
(Bilkent University, 2019-09)We study classification and regression for variable length sequential data, which is either non-uniformly sampled or contains missing samples. In most sequential data processing studies, one considers data sequence is ... -
Effects of auditory attention on language representation across the human brain
(Bilkent University, 2019-09)Humans can effortlessly identify target auditory objects during natural listening and shift their focus between different targets. Unique allocation of brain resources would be inefficient for semantic search task. Here, ... -
Interactive real-time RF control for MRI transmit channels
(Bilkent University, 2019-09)Cardiac catheterization is one of the heavily researched areas of the real-time interventional studies in Magnetic Resonance Imaging (MRI), where elongated conductive wires are prone to excessive radiofrequency (RF) ... -
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 ...
