Advisors
Now showing items 117 of 17

Accurate and efficient solutions of electromagnetic problems with the multilevel fast multipole algorithm
(Bilkent University, 2009)The multilevel fast multipole algorithm (MLFMA) is a powerful method for the fast and efficient solution of electromagnetics problems discretized with large numbers of unknowns. This method reduces the complexity of ... 
A comparative study of twodimensional modeling methods for electromagnetic scattering data
(Bilkent University, 2007)The aim of this research is to model twodimensional data encountered in electromagnetic scattering problems using modelbased parameter estimation techniques. Once a highly accurate model is constructed from a few ... 
Effective preconditioners for iterative solutions of largescale surfaceintegralequation problems
(Bilkent University, 2010)A popular method to study electromagnetic scattering and radiation of threedimensional electromagnetics problems is to solve discretized surface integral equations, which give rise to dense linear systems. Iterative ... 
Electromagnetic imaging of threedimensional conducting objects using the Newton minimization approach
(Bilkent University, 2013)The main goal of shape reconstruction is to retrieve the location and shape of an unknown target. This approach is used in a wide range of areas, from detecting cancer tumors to finding buried objects. Various methods ... 
Extrapolation with the matrix pencil method to combine lowfrequency and highfrequency electromagnetic scattering results
(Bilkent University, 2005)Accurate frequency domain solutions of electromagnetic scattering problems are known to require high computing resources as the solution frequency increases. On the other hand, highfrequency techniques provide us solutions ... 
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 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 ... 
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, ... 
Interpolation and extrapolation of scattering results of a canonical geometry
(Bilkent University, 2002)It is wellknown that calculation of scattered fields at high frequencies is consuming too much CPU time and memory allocation. The exponential model is used to predict the high frequency values in the radar cross section ... 
Memoryefficient multilevel physical optics algorithm for the solution of electromagnetic scattering problems
(Bilkent University, 2007)For the computation of electromagnetic scattering from electrically large targets, physical optics (PO) technique can provide approximate but very fast solutions. Moreover, higher order approximations, such as physical ... 
Outofcore implementation of the parallel multilevel fast multipole algorithm
(Bilkent University, 2013)We developed an outofcore (OC) implementation of the parallel multilevel fast multipole algorithm (MLFMA) to solve electromagnetic problems with reduced memory. The main purpose of the OC method is to reduce incore ... 
Parallel hardware and software implementations for electromagnetic computations
(Bilkent University, 2005)Multilevel fast multipole algorithm (MLFMA) is an accurate frequencydomain electromagnetics solver that reduces the computational complexity and memory requirement significantly. Despite the advantages of the MLFMA, ... 
Scattering and radiation problems of arbitrarily shaped conducting bodies above the ground plane
(Bilkent University, 2002)A method of moment solution is applied for the scattering and radiation problems of arbitrarily shaped conducting bodies placed close to an infinite ground plane. An equivalent problem is produced by using image theory ... 
Solution of electromagnetic scattering problems involving curved surfaces
(Bilkent University, 1997)The method of moments (MoM) is an efficient technique for the solution of electromagnetic scattering problems. Problems encountered in reallife applications are often three dimensional and involve electrically large ... 
Solution of electromagnetic scattering problems with the locally corrected Nyström method
(Bilkent University, 2010)The locally corrected Nystr¨om (LCN) method is used to solve integral equations with high accuracy and efficiency. Unlike commonly used methods, the LCN method employs highorder basis functions on highorder surfaces. ... 
Solution of electromagnetics problems with the equivalence principle algorithm
(Bilkent University, 2010)A domain decomposition scheme based on the equivalence principle for integral equations is studied. This thesis discusses the application of the equivalence principle algorithm (EPA) in solving electromagnetics scattering ...