Theses - Graduate School of Engineering and Science
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Nanotribological properties of graphene grown by chemical vapor deposition and transferred onto silicon oxide substrates
(Bilkent University, 2015)To extend the lifespan of mechanical systems, wear and friction must be minimized with the utilization of lubricants. On the other hand, traditional fluid-based lubrication schemes fail in nano- and micro-scale systems ... -
A hybrid approach for human motion retrieval
(Bilkent University, 2015)Retrieving similar motions from motion databases has become an essential topic of computer animation research. The use of binary geometric features and inverted indexes is one of the efficient solutions to this problem. ... -
Functional nanoplasmonic devicesand novel photonic materials
(Bilkent University, 2015)Plasmonics is one of the pillars of nanophotonics involving light matter interactions. Its applications found very wide range covering photovoltaics, photodetection, optical communication, surface enhanced infrared ... -
Exceptional Belyi coverings
(Bilkent University, 2015)Exceptional Belyi covering is a connected Belyi covering uniquely determined by its ramification scheme or the respective dessin d’enfant. Well known examples are cyclic, dihedral, and Chebyshev coverings. We add to this ... -
Heart sound segmentation using signal processing methods
(Bilkent University, 2015)Heart murmurs are pathological heart sounds that originate from blood flowing with abnormal turbulence due to physiological defects of the heart, and are the prime indicator of many heart-related diseases. Murmurs can ... -
Preparation, characterization, and ınvestigation of H2 storage capacities of Pruussian blue analogues
(Bilkent University, 2015)A convenient and efficient hydrogen storage system is a research challenge since hydrogen storage is one of the most critical steps in hydrogen economy. The media where hydrogen molecule is stored is important not ... -
Sequential nonlinear learning
(Bilkent University, 2015)We study sequential nonlinear learning in an individual sequence manner, where we provide results that are guaranteed to hold without any statistical assumptions. We address the convergence and undertraining issues of ... -
Image restoration and reconstruction using projections onto epigraph set of convex cost fuchtions
(Bilkent University, 2015)This thesis focuses on image restoration and reconstruction problems. These inverse problems are solved using a convex optimization algorithm based on orthogonal Projections onto the Epigraph Set of a Convex Cost functions ... -
Structure and nanotribology of thermally deposited gold nanoparticles on graphite
(Bilkent University, 2015)Forming a complete understanding of the physical mechanisms that govern friction on the nanometer and atomic scales is an ongoing endeavor for scientists from various disciplines. While atomic force microscopy (AFM) has ... -
Tribological transfer of polytetrafluoroethylene onto silicon oxide and polymer surfaces
(Bilkent University, 2015)The main objective of this study is to understand the nature of tribological transfer of polytetrafluoroethylene (PTFE) onto counter thermally-oxidized silicon, polystyrene (PS), polyvinylchloride (PVC) and poly(methyl ... -
Design of P and PI controllers for head positioning in hard disk drives with time delay
(Bilkent University, 2015)In today’s high performance positioning applications, due to stringent design objectives, it is very challenging to cope with input-output time delays. In Hard Disk Drive (HDD) servo system, the information flow between ... -
Design of PD controlleers for unstable infinitive dimensional plants with time-delay
(Bilkent University, 2015)In real life, everything is in movement so there are always continuous transfers, transmissions and transports of people, materials, information and energy to other places. These transfers, transmissions and transports ... -
Online learning over distributed networks
(Bilkent University, 2015)We study online learning strategies over distributed networks. Here, we have a distributed collection of agents with learning and cooperation capabilities. These agents observe a noisy version of a desired state of the ... -
Topic-based influence computation in social networks under resource constraints
(Bilkent University, 2015)As social networks are constantly changing and evolving, methods to analyze dynamic social networks are becoming more important in understanding social trends. However, due to the restrictions imposed by the social network ... -
Supramolecular chiral self-assembled peptide nanostructures
(Bilkent University, 2016-01)Self-assembly process is an easy and convenient bottom-up technique for designing novel functional materials. Self-assembled peptide amphiphile (PA) molecules are remarkable building blocks for a wide-range of applications ... -
Investigation of NO2 and SO2 adsorption/desorption properties of advanced ternary and quaternary mixed oxides for DENOx catalysis
(Bilkent University, 2015-11)The main premise of the current study is the design, synthesis and functional characterization of novel catalytic materials with superior resistance against sulfur poisoning without compromising NOx storage capacity (NSC) ... -
CoFe prussian blue coordination compounds incorporating metallopolymers: Investigation of electrocatalytic water oxidation activities
(Bilkent University, 2016-02)Hydrogen economy, which depends on water and sunlight as energy source, needs to be implemented as an alternative to carbon based economy. For the development of a technology that incorporates hydrogen energy to our daily ... -
S³-TM : scalable streaming short text matching
(Bilkent University, 2014)Micro-blogging services have become major venues for information creation, as well as channels of information dissemination. Accordingly, monitoring them for relevant information is a critical capability. This is typically ... -
Teaching vocabulary using collocations versus using definitions in EFL classes
(Bilkent University, 2000)Teaching words in collocations is a comparatively new technique and it is accepted as an effective one in vocabulary teaching. The purpose of this study was to find out whether teaching vocabulary would result in better ... -
A study on the effect of immediate reading about a topic on students' writing proficiency
(Bilkent University, 1992)It is a generally observed fact that reading and writing are taught as isolated skills rather than in an integrated way and this is one of the reasons why students fail to improve their writing skill as their writing ...
