Browsing by Author "Malas, T."
Now showing items 17 of 7

Accelerating the multilevel fast multipole algorithm with the sparseapproximateinverse (SAI) preconditioning
Malas, T.; Gürel, Levent (Society for Industrial and Applied Mathematics, 2009)With the help of the multilevel fast multipole algorithm, integralequation methods can be used to solve reallife electromagnetics problems both accurately and efficiently. Increasing problem dimensions, on the other hand, ... 
Analysis of dielectric photoniccrystal problems with MLFMA and Schurcomplement preconditioners
Ergül, Özgür; Malas, T.; Gürel, Levent (IEEE, 20110113)We present rigorous solutions of electromagnetics problems involving 3D dielectric photonic crystals (PhCs). Problems are formulated with recently developed surface integral equations and solved iteratively using the ... 
Fast and accurate analysis of large metamaterial structures using the multilevel fast multipole algorithm
Gürel, Levent; Ergül, Özgür; Ünal, A.; Malas, T. (2009)We report fast and accurate simulations of metamaterial structures constructed with large numbers of unit cells containing splitring resonators and thin wires. Scattering problems involving various metamaterial walls are ... 
Incomplete LU preconditioning with the multilevel fast multipole algorithm for electromagnetic scattering
Malas, T.; Gürel, Levent (Society for Industrial and Applied Mathematics, 2007)Iterative solution of largescale scattering problems in computational electromagnetics with the multilevel fast multipole algorithm (MLFMA) requires strong preconditioners, especially for the electricfield integral ... 
Iterative nearfield preconditioner for the multilevel fast multipole algorithm
Gürel, Levent; Malas, T. (Society for Industrial and Applied Mathematics, 20100706)For iterative solutions of large and difficult integralequation problems in computational electromagnetics using the multilevel fast multipole algorithm (MLFMA), preconditioners are usually built from the available sparse ... 
Parallel image restoration using surrogate constraint methods
Uçar, B.; Aykanat, Cevdet; Pınar, M. Ç.; Malas, T. (Academic Press, 2007)When formulated as a system of linear inequalities, the image restoration problem yields huge, unstructured, sparse matrices even for images of small size. To solve the image restoration problem, we use the surrogate ... 
Solutions of largescale electromagnetics problems using an iterative innerouter scheme with ordinary and approximate multilevel fast multipole algorithms
Ergül, A.; Malas, T.; Gürel, Levent (2010)We present an iterative innerouter scheme for the efficient solution of largescale electromagnetics problems involving perfectlyconducting objects formulated with surface integral equations. Problems are solved by ...