Theses - Department of Electrical and Electronics Engineering
Faculty of Engineering
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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 ... -
S-band GaN high power amplifier design and implementation
(Bilkent University, 2019-02)High power RF Microwave amplifiers are becoming more important as the telecommunications, defense and aerospace industries' demands develop. GaN on SiC technology offers higher power and better form factors for these ... -
S-band GaN based low noise MMIC amplifier design and characterization
(Bilkent University, 2019-02)Low Noise Amplifiers (LNA) are widely preferred components in receiver frontend modules. The received signal level is generally very low and amplifying it without adding too much noise is very crucial in communication ... -
Development of fiber optical delay line based 10 GHZ phase noise measurement system
(Bilkent University, 2019-02)Microwave photonics is an emerging field of study exploiting broadband, low loss photonics technology for high spectral purity microwave generation, processing and distribution. Fiber optical delay lines are such systems ... -
Design of an X-band GaN based microstrip MMIC power amplifier
(Bilkent University, 2019-02)RF power amplifiers are crucial components of modern radar and communication systems. However, their design poses some challenges due to device limitations in high power and high frequency regime, as well as inherent ... -
Improved Wilkinson power divider structures for millimeter-wave applications
(Bilkent University, 2019-01)Communication systems, radars, electronic warfare and space applications desire integrated circuits with higher operating frequencies. Working at the millimeter-wave region increases data rates, provides a more efficient use ... -
Design, implementation, manufacturing and measurements of Dickson charge pump circuits for capacitive micromachined sensor biasing
(Bilkent University, 2019-02)This work presents the design and testing process of Dickson charge pump circuits for micromachined sensor biasing. Necessary blocks of different types of circuits with different functions are examined such as inverters, ... -
Ku-band substrate integrated waveguide bandpass filter design using mechanical tuning
(Bilkent University, 2019-02)Substrate integrated waveguide (SIW) filters are widely used due to their easy fabrication techniques and relatively high quality factor. In microwave frequencies, manufacturing tolerances become comparable with wavelength ... -
Rapid multi-contrast magnetic resonance imaging and time-of-flight angiography
(Bilkent University, 2019-02)Magnetic resonance imaging (MRI) is a frequently used imaging modality for examining soft tissue structures. Long scanning time is the most crucial constraint that limits the use of MRI in the clinics. Partial Fourier ... -
Performance analysis of CSMA/CD for in-band full duplex wireless communication
(Bilkent University, 2019-01)In-band full duplex (IBFD) wireless communication is gaining a lot of interest as it improves spectral efficiency. Due to development in self-interference cancellation schemes and overcoming hardware limitations, IBFD ... -
Numerical methods for the transient analysis of multi-regime Markov fluid queues
(Bilkent University, 2019-01)Markov fluid queue models have served as one of the main tools for the performance analysis of computer and communication systems and networks. These models have also been used in other disciplines such as insurance risk, ... -
Reservation frame slotted ALOHA for multi-class IOT networks
(Bilkent University, 2019-01)The Internet of Things (IoT) is a promising technology capable of revolutionizing our work and daily lives. ALOHA based medium access schemes are widely used in IoT applications due to their low complexity despite lower ... -
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 ...
