Browsing Theses  Department of Electrical and Electronics Engineering by Title
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Fall detection and classification using wearable motion sensors
(Bilkent University, 201709)Effective falldetection systems are vital in mitigating severe medical and economical consequences of falls to people in the fall risk groups. One class of such systems is wearable sensor based falldetection systems. ... 
Fast algorithms for large 3D electromagnetic scattering and radiation problems
(Bilkent University, 1997)Some interesting reallife radiation and scattering problems are electrically very large and cannot be solved using traditional solution algorithms. Despite the difficulties involved, the solution of these problems usually ... 
Fast algorithms for linear and nonlinear microwave circuit simulation
(Bilkent University, 1994)A new method is proposed for dominant polezero (or poleresidue) analysis of large linear microwave circuits containing both lumped and distributed elements. This method is based on a multipoint Fade approximation. It ... 
Fast and efficient solutions of multiscale electromagnetic problems
(Bilkent University, 202011)Frequencydomain surface integral equations (SIEs) used together with the method of moments (MoM), and/or its accelerated versions, such as the multilevel fast multipole algorithm (MLFMA), are usually the most ... 
Fast and robust solution techniques for large scale linear least squares problems
(Bilkent University, 202007)Momentum Iterative Hessian Sketch (MIHS) techniques, a group of solvers for large scale linear Least Squares (LS) problems, are proposed and analyzed in detail. Proposed MIHS techniques are obtained by incorporating the ... 
Fast calibration and image reconstruction for magnetic particle imaging
(Bilkent University, 201805)Magnetic particle imaging (MPI) is a relatively new medical imaging modality that images the spatial distribution of magnetic nanoparticles (MNPs) administered to the body. For image reconstruction with the system matrix ... 
Fast multipole method for the solution of electromagnetic scattering problems
(Bilkent University, 2003)The fast multipole method (FMM) is investigated in detail for the solution of electromagnetic scattering problems involving arbitrarily shaped threedimensional conducting surfaces. This method is known to reduce the ... 
Fast solutions of multiple monostatic radar cross section problems using the recompressed adaptive cross approximation algorithm
(Bilkent University, 201401)We developed a method that incorporates an algebraic compression technique to accelerate the computation of multiple monostatic radar cross sections (RCSs) of arbitrary 3D geometries. Since most radars rely on the ... 
Feature extraction with the fractional Fourier transform
(Bilkent University, 1998)In this work, alternative design and implementation techniques for feature extraction applications are proposed. The proposed techniques amount to decomposing the overall feature extraction problem into a global linear ... 
Feature point classification and matching
(Bilkent University, 2007)A feature point is a salient point which can be separated from its neighborhood. Widely used definitions assume that feature points are corners. However, some nonfeature points also satisfy this assumption. Hence, ... 
Feedback fluid queues with multiple tresholds
(Bilkent University, 2006)Unlike discrete or continuous time queuing systems fed with point processes, workload in fluid queues arrives at the system as a fluid flow rather than jobs or packets. The rate of the fluid flow is governed by a continuous ... 
Femtosecond optical parametric amplifiers based on betabarium borate crystals
(Bilkent University, 1996)In this thesis we describe our experiments to construct and evaluate nondegenerate and degenerate optical parametric amplifiers (OP.\) based on betabarium borate (BBO) crystals. VVe used a modelocked Titanium.Sapphire laser ... 
Femtosecond optical parametric oscillators based on potassium titanyl phosphate crystals
(Bilkent University, 1996)In this thesis, we describe our experiments to construct and characterize optical parametric oscillators (OPO) based on a potassium titanyl phosphate (KTP) crystals. The oscillator is synchronously pumped by a ... 
Finite element method based simulation, desing, and resonant mode analysis of radio frequency birdcage coils used in magnetic resonance imaging
(Bilkent University, 2012)Radio Frequency (RF) birdcage coils are widely used in Magnetic Resonance Imaging (MRI) since they can generate very homogeneous RF magnetic field inside the coil and have high signaltonoise ratio (SNR). In practice, ... 
Finite element method based simulations of low frequency magnetic field in seawater
(Bilkent University, 2013)Propagation properties of the electromagnetic waves in seawater are different than in air (vacuum) due to electrical conductivity (σ) and high relative permittivity (εr) of the seawater. Numerically it is hard to solve ... 
Finite representation of finite energy signals
(Bilkent University, 2011)In this thesis, we study how to encode finite energy signals by finitely many bits. Since such an encoding is bound to be lossy, there is an inevitable reconstruction error in the recovery of the original signal. We also ... 
Finitedifference timedomain solution of electromagnetic scattering problems
(Bilkent University, 1997)The "finitedifference timedomain" (FDTD) method is an efficient and powerful way to solve threedimensional scattering problems. Unbounded medium problems are easily solved in this method using the absorbing boundaries, ... 
Fir filter design by convex optimization using rank refinement
(Bilkent University, 2014) 
Fire and flame detection methods in images and videos
(Bilkent University, 2010)In this thesis, automatic fire detection methods are studied in color domain, spatial domain and temporal domain. We first investigated fire and flame colors of pixels. Chromatic Model, Fisher’s linear discriminant, ... 
Fire detection algorithms using multimodal signal and image analysis
(Bilkent University, 2009)Dynamic textures are common in natural scenes. Examples of dynamic textures in video include fire, smoke, clouds, volatile organic compound (VOC) plumes in infrared (IR) videos, trees in the wind, sea and ocean waves, ...