Levent Gurel

Electrical and Computer Engineering
Levent Gurel
Adjunct Professor

Primary Research Area

  • Electromagnetics and Optics

For more information

Profile

Education

  • 1988-1991, University of Illinois, Urbana-Champaign, IL, Ph.D. in Electrical and Computer Engineering
  • 1986-1988, University of Illinois, Urbana-Champaign, IL, M.S. in Electrical and Computer Engineering
  • 1982-1986, Middle East Technical University, Ankara, Turkey, B.Sc. (High Honors) in Electrical and Electronics Engineering

Academic Positions

  • University of Illinois, Urbana-Champaign,  Adjunct Professor, 2010 – present.
  • Bilkent University, Ankara, Turkey, Professor, Department of Electrical and Electronics Engineering, 2003 – 2014.
  • University of Illinois, Urbana‑Champaign, Adjunct Professor, 2005 – 2008.
  • Bilkent University, Ankara, Turkey, Associate Professor, Department of Electrical and Electronics Engineering, 1999 – 2003.
  • University of Illinois, Urbana‑Champaign, Visiting Associate Professor, 1997 – 1998.
  • Bilkent University, Ankara, Turkey, Assistant Professor, Department of Electrical and Electronics Engineering, 1994 –1999.
  • University of Illinois, Urbana-Champaign, Department of Electrical and Computer Engineering, Graduate research and teaching assistant, 1986 –1991.

Other Professional Employment

  • ABAKUS Computing Technologies, Founder and CEO, 2012 – present.
  • Izmir University of Economics, Izmir, Turkey, Member, Board of Trustees, 2012 – present.
  • Computational Electromagnetics Research Center (BiLCEM), Bilkent University, Founder and Director, 2005 – 2014.
  • IBM Research Division, Yorktown Heights, NY, Research staff member, 1991 – 1994.
  • IBM Research Division, Yorktown Heights, NY, 1989 – 1989.
  • ASELSAN Military Electronics Industries, Inc., Ankara, Turkey, Part time researcher in the Department of R&D, 1985 – 1986.
  • ASELSAN Military Electronics Industries, Inc., Ankara, Turkey, Summer internship in the Department of R&D, 1984 – 1984.
  • Izmir Iron and Steel Factory, Izmir, Turkey, Maintained power systems and electric machinery. Completed engineering drawings, 1983 – 1983.

Professional Highlights

  • 2006 – 2016, World Record in Computational Electromagnetics. Solution of integral-equation problems involving more than one billion unknowns.

Research Interests

  • Physics, electromagnetic theory, scattering and radiation, wave phenomena
  • Numerical analysis
  • Linear algebra, iterative solvers, preconditioners
  • Integral equations
  • Computer engineering, parallel architectures, multicore processors, high-performance networks, heterogeneous computing platforms, CPU-GPU architectures
  • Imaging, bio-imaging, multi-physics imaging, subsurface imaging, electromagnetic inverse problems
  • Big data, data-intensive computing
  • Parallel computing
  • Fast algorithms
  • Computational electromagnetics

Research Areas

Books Authored or Co-Authored (Original Editions)

Books Edited or Co-Edited (Original Editions)

  • L. Gürel, Ed., “CEM’13 Computational Electromagnetics,” Proceedings of the 2013 Computational Electromagnetics Workshop, Izmir, Turkey, Aug. 2-5, 2013.
  • L. Gürel, Ed., “CEM’11 Computational Electromagnetics,” Proceedings of the 2011 Computational Electromagnetics Workshop, Izmir, Turkey, Aug. 10-13, 2011.
  • L. Gürel, Ed., “CEM’09 Computational Electromagnetics,” Proceedings of the 2009 Computational Electromagnetics Workshop, Izmir, Turkey, July 20-23, 2009.
  • L. Gürel, Ed., “CEM’07 Computational Electromagnetics,” Proceedings of the 2007 Computational Electromagnetics Workshop, Izmir, Turkey, Aug. 30-31, 2007.

Selected Articles in Journals

  • Ö. Ergül and L. Gürel, “Fast and accurate analysis of large-scale composite structures with the parallel multilevel fast multipole algorithm,” J. Opt. Soc. Am. A., vol. 30, no. 3, pp. 509 - 517, Mar. 2013.
  • L. Gürel and Ö. Ergül, “Hierarchical parallelization of the multilevel fast multipole algorithm (MLFMA),” Proceedings of the IEEE, vol. 101, no. 2, pp. 332 - 341, Feb. 2013.
  • Ö. Ergül and L. Gürel, “Rigorous analysis of double-negative materials with the multilevel fast multipole algorithm,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 2, pp. 161-168, Feb. 2012.
  • T. Malas and L. Gürel, “Schur complement preconditioners for surface integral-equation formulations of dielectric problems solved with the multilevel fast multipole algorithm,” SIAM J. Sci. Comput., vol. 33, no. 5, pp. 2440–2467, 2011.
  • Ö. Ergül, T. Malas, and L. Gürel, “Analysis of dielectric photonic-crystal problems with MLFMA and Schur-complement preconditioners,” J. Lightw. Technol., vol. 29, no. 6, pp. 888-897, Mar. 2011.
  • Ö. Ergül and L. Gürel, “Rigorous solutions of electromagnetics problems involving hundreds of millions of unknowns,” IEEE Antennas Propagat. Mag., vol. 53, no. 1, pp. 18-27, Feb. 2011.
  • Ö. Ergül and L. Gürel, “Improving iterative solutions of the electric-field integral equation via transformations into normal equations,” J. of Electromagn. Waves Appl., vol. 24, no. 16, pp. 2129-2138, Nov. 2010.
  • Ö. Ergül and L. Gürel, “Efficient solutions of metamaterial problems using a low-frequency multilevel fast multipole algorithm,” Prog. Electromagn. Res., vol. 108, pp. 81-99, 2010.
  • Ö. Ergül, T. Malas, and L. Gürel, “Solutions of large-scale electromagnetics problems using an iterative inner-outer scheme with ordinary and approximate multilevel fast multipole algorithms,” Prog. Electromagn. Res., vol. 106, pp. 203-223, doi:10.2528/PIER10061711, 2010.
  • Ö. Ergül, A. Arslan-Ergül, and L. Gürel, “Computational study of scattering from healthy and diseased red blood cells,” J. Biomed. Opt., vol. 15, no. 4, 045004, doi:10.1117/1.3467493, July/Aug. 2010.
  • Ö. Ergül and L. Gürel, “Efficient solution of the electric and magnetic current combined-field integral equation with the multilevel fast multipole algorithm and block-diagonal preconditioning,” Radio Science, vol. 44, RS6001, doi:10.1029/2009RS004143, 2009.
  • Ö. Ergül and L. Gürel, “Discretization error due to the identity operator in surface integral equations,” Comput. Phys. Commun., vol. 180, no. 10, pp. 1746-1752, Oct 2009.
  • L. Gürel and Ö. Ergül, “Contamination of the accuracy of the combined-field integral equation with the discretization error of the magnetic-field integral equation,” IEEE Trans. Antennas Propagat., vol. 57, no. 9, pp. 2650 – 2657, Sept. 2009.
  • L. Gürel, Ö. Ergül, A. Ünal, and T. Malas, “Fast and accurate analysis of large metamaterial structures using the multilevel fast multipole algorithm,” Prog. Electromagn. Res., PIER 95, pp. 179-198, 2009.
  • Ö. Ergül and L. Gürel, “A hierarchical partitioning strategy for an efficient parallelization of the multilevel fast multipole algorithm,” IEEE Trans. Antennas Propagat., vol. 57, no. 6, pp. 1740–1750, June 2009.
  • Ö. Ergül and L. Gürel, “Iterative solutions of hybrid integral equations for coexisting open and closed surfaces,” IEEE Trans. Antennas Propagat., vol. 57, no. 6, pp. 1751–1758, June 2009.
  • Ö. Ergül, I. van den Bosch, and L. Gürel, “Two-step Lagrange interpolation method for the multilevel fast multipole algorithm,” IEEE Antennas Wireless Propagat. Lett., vol. 8, pp. 69–71, 2009.
  • T. Malas and L. Gürel, “Accelerating the multilevel fast multipole algorithm with the sparse-approximate-inverse (SAI) preconditioning,” SIAM J. Sci. Comput., vol. 31, no. 3, pp. 1968–1984, 2009.
  • Ö. Ergül and L. Gürel, “Comparison of integral-equation formulations for the fast and accurate solution of scattering problems involving dielectric objects with the multilevel fast multipole algorithm,” IEEE Trans. Antennas Propagat., vol. 57, no. 1, pp. 176-187, Jan. 2009.
  • L. Gürel and Ö. Ergül, “Design and simulation of circular arrays of trapezoidal-tooth log-periodic antennas via genetic optimization,” Prog. Electromagn. Res., PIER 85, pp. 243-260, 2008.
  • Ö. Ergül and L. Gürel, “Novel electromagnetic surface integral equations for highly accurate computations of dielectric bodies with arbitrarily low contrasts,” J. Comput. Phys., vol. 227, no. 23, pp. 9898-9912, Dec. 2008.
  • Ö. Ergül and L. Gürel, “Efficient parallelization of the multilevel fast multipole algorithm for the solution of large-scale scattering problems,” IEEE Trans. Antennas Propagat., vol. 56, no. 8, pp. 2335-2345, Aug. 2008.
  • Ö. Ergül and L. Gürel, “Stabilization of integral-equation formulations for the accurate solution of scattering problems involving low-contrast dielectric objects,” IEEE Trans. Antennas Propagat., vol. 56, no. 3, pp. 799-805, Mar. 2008.
  • Ö. Ergül and L. Gürel, “Hierarchical parallelisation strategy for the multilevel fast multipole algorithm in computational electromagnetics,” Electron. Lett., vol. 44, no. 1, pp. 3-5, Jan. 2008.
  • Ö. Ergül and L. Gürel, “Efficient solution of the electric-field integral equation by the iterative LSQR algorithm,” IEEE Antennas Wireless Propagat. Lett., vol. 7, pp. 36-39, 2008.
  • L. Gürel and Ö. Ergül, “Fast and accurate solutions of extremely large integral-equation problems discretized with tens of millions of unknowns,” Electron. Lett., vol. 43, no. 9, pp. 499-500, doi:10.1049/el:20070639, Apr. 2007.
  • Ö. Ergül and L. Gürel, “Modelling and synthesis of circular-sectoral arrays of log-periodic antennas using multilevel fast multipole algorithm and genetic algorithms,” Radio Science, vol. 42, doi:10.1029/2006RS003567, RS3018, June 2007.
  • T. Malas and L. Gürel, “Incomplete LU preconditioning with multilevel fast multipole algorithm for electromagnetic scattering,” SIAM J. Scientific Computing, vol. 29, no. 4, pp. 1476-1494, doi:10.1137/060659107, June 2007.
  • Ö. Ergül and L. Gürel, “Linear-linear basis functions for MLFMA solutions of magnetic-field and combined-field integral equations,” IEEE Trans. Antennas Propagat., vol. 55, no. 4, pp. 1103-1110, Apr. 2007.
  • L. Gürel and Ö. Ergül, “Extending the applicability of the combined-field integral equation to geometries containing open surfaces,” IEEE Antennas Wireless Propagat. Lett., vol. 5, pp. 515-516, 2006.
  • Ö. Ergül and L. Gürel, “Enhancing the accuracy of the interpolations and anterpolations in MLFMA,” IEEE Antennas Wireless Propagat. Lett., vol. 5, pp. 467-470, 2006.
  • Ö. Ergül and L. Gürel, “Optimal interpolation of translation operator in multilevel fast multipole algorithm,” IEEE Trans. Antennas Propagat., vol. 54, no. 12, pp. 3822-3826, Dec. 2006.
  • Ö. Ergül and L. Gürel, “Enhancing the accuracy of the interpolations and anterpolations in MLFMA,” IEEE Antennas Wireless Propagat. Lett., vol. 5, pp. 467-470, 2006.
  • Ö. Ergül and L. Gürel, “Improving the accuracy of the magnetic-field integral equation with the linear-linear basis functions,” Radio Sci., vol. 41, RS4004, doi:10.1029/2005RS003307, July 2006.
  • Ö. Ergül and L. Gürel, “The use of curl-conforming basis functions for the magnetic-field integral equation,” IEEE Trans. Antennas Propagat., vol. 54, no. 7, pp. 1917-1926, July 2006.
  • Ö. Ergül and L. Gürel, “Improved testing of the magnetic-field integral equation,” IEEE Microwave Wireless Comp. Lett., vol. 15, no. 10, pp. 615-617, Oct. 2005.
  • L. Gürel and Ö. Ergül, “Singularity of the magnetic-field integral equation and its extraction,” IEEE Antennas Wireless Propagat. Lett., vol. 4, pp. 229-232, 2005.
  • Ö. Ergül and L. Gürel, “Solid-angle factor in the magnetic-field integral equation,” Microwave and Optical Technology Letters, vol. 45, no. 5, pp. 452-456, June 2005.
  • Ö. Ergül and L. Gürel, “Nonplanar trapezoidal-tooth log-periodic antennas: design and electromagnetic modelling,” Radio Science, vol. 40, RS5010, doi:10.1029/2004RS003215, Oct. 2005.
  • U. Oğuz and L. Gürel, “Reducing the dispersion errors of the finite-difference time-domain method for multifrequency plane-wave excitations,” Electromagnetics, vol. 23, no. 6, pp. 539-552, Aug.-Sep. 2003.
  • L. Gürel, H. Bağcı, J. C. Castelli, A. Cheraly, and F. Tardivel, “Validation through comparison: measurement and calculation of the bistatic radar cross section (BRCS) of a stealth target,” Radio Science, vol. 38, no. 3, pp. 12-1 - 12-10, June 2003.
  • U. Oğuz and L. Gürel, “Optimization of the transmitter-receiver separation in the ground-penetrating radar,” IEEE Trans. Antennas Propagat., vol. 51, no. 3, pp. 362-370, Mar. 2003.
  • L. Gürel and U. Oğuz, “Transmitter-receiver-transmitter-configured ground-penetrating radars over randomly heterogeneous ground models,” Radio Science, vol. 37, no. 6, pp. 6-1– 6-9, Nov.-Dec. 2002.
  • U. Oğuz and L. Gürel, “Frequency responses of ground-penetrating radars operating over highly lossy grounds,” IEEE Trans. Geosci. Remote Sensing, vol. 40, no. 6, pp. 1385-1394, June 2002.
  • U. Oğuz and L. Gürel, “Application of signal-processing techniques to dipole excitations in the finite-difference time-domain method,” J. Electromagn. Waves Appl., vol. 16, no. 5, pp. 671-687, May 2002.
  • L. Gürel and U. Oğuz, “Transmitter receiver transmitter configurations of the ground penetrating radar,” Radio Science, vol. 37, no. 3, pp. 5-1–5-7, May 2002.
  • M. I. Aksun, F. Çalışkan, and L. Gürel, “An efficient method for electromagnetic characterization of 2 D geometries in stratified media,” IEEE Trans. Microwave Theory Tech., vol. 50, no. 5, pp. 1264-1274, May 2002.
  • U. Oğuz and L. Gürel, “Modeling of ground-penetrating-radar antennas with shields and simulated absorbers,” IEEE Trans. Antennas Propagat., vol. 49, no. 11, pp. 1560-1567, Nov. 2001.
  • L. Gürel and U. Oğuz, “Simulations of ground-penetrating radars over lossy and heterogeneous grounds,” IEEE Trans. Geosci. Remote Sensing, vol. 39, no. 6, pp. 1190-1197, June 2001.
  • L. Gürel and U. Oğuz, “Three-dimensional FDTD modeling of a ground-penetrating radar,” IEEE Trans. Geosci. Remote Sensing, vol. 38, no. 4, pp. 1513-1521, July 2000.
  • L. Gürel and U. Oğuz, “Signal-processing techniques to reduce the sinusoidal steady-state error in the FDTD method,” IEEE Trans. Antennas Propagat., vol. 48, no. 4, pp. 585-593, April 2000.
  • L. Gürel, K. Sertel, and İ. K. Şendur, “On the choice of basis functions to model surface electric current densities in computational electromagnetics,” Radio Science, vol. 34, no. 6, pp. 1373-1387, Nov.–Dec. 1999.
  • U. Oğuz, L. Gürel, and O. Arıkan, “An efficient and accurate technique for the incident-wave excitations in the FDTD method,” IEEE Trans. Microwave Theory Tech., vol. 46, no. 6, pp. 869-882, June 1998.
  • L. Gürel and W. C. Chew, “Fast algorithm for scattering from planar arrays of conducting patches,” IEEE Microwave and Guided Wave Lett., vol. 8, no. 4, pp. 155-157, April 1998.
  • U. Oğuz and L. Gürel, “Interpolation techniques to improve the accuracy of the of the plane wave excitations in the finite difference time domain method,” Radio Science, vol. 32, no. 6, pp. 2189-2199, Nov.-Dec. 1997.
  • L. Gürel and M. I. Aksun, “Electromagnetic scattering solution of conducting strips in layered media using the fast multipole method,” IEEE Microwave and Guided Wave Lett., vol. 6, no. 8, pp. 277-279, Aug. 1996.
  • L. Gürel and W. C. Chew, “Recursive T-matrix algorithms for the solution of electromagnetic scattering from strip and patch geometries,” IEEE Trans. Antennas Propagat., vol. AP-41, pp. 91-99, Jan. 1993.
  • L. Gürel and W. C. Chew, “Scattering solution of three-dimensional array of patches using the recursive T-matrix algorithms,” IEEE Microwave and Guided Wave Lett., vol. 2, pp. 182-184, May 1992.
  • W. C. Chew, Y. M. Wang, and L. Gürel, “Recursive algorithm for wave-scattering solutions using windowed addition theorem,” J. of Electromagn. Waves Appl., vol. 6, no. 11, pp. 1537-1560, Nov. 1992.
  • L. Gürel and W. C. Chew, “A recursive T-matrix algorithm for strips and patches,” Radio Science, vol. 27, pp. 387-401, May-June 1992.
  • L. Gürel and W. C. Chew, “Recursive algorithms for calculating the scattering from N strips or patches,” IEEE Trans. Antennas Propagat., vol. AP-38, pp. 507-515, Apr. 1990.
  • L. Gürel and W. C. Chew, “Guidance or resonance conditions for strips or disks embedded in homogeneous and layered media,” IEEE Trans. Microwave Theory Tech., vol. MTT-36, pp. 1498-1506, Nov. 1988.
  • W. C. Chew and L. Gürel, “Reflection and transmission operators for strips or disks embedded in homogeneous and layered media,” IEEE Trans. Microwave Theory Tech., vol. MTT-36, pp. 1488-1497, Nov. 1988.

Articles in Conference Proceedings

  • A. Etminan, A. Sadeghi, and L. Gürel, “Electromagnetic imaging of three-dimensional dielectric objects with Newton minimization,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • M. Takrimi and L. Gürel, “A modified equivalence principle for open surfaces,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • M. Kazempour and L. Gürel, “Algebraic acceleration and regularization of the source reconstruction method with the recompressed adaptive cross approximation,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • M. Hidayetoğlu and L. Gürel, “MLFMA memory reduction techniques for solving large-scale problems,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • A. Etminan and L. Gürel, “Shape reconstruction of three-dimensional conducting objects via near-field measurements,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • M. Kazempour and L. Gürel, “Fast solution of electromagnetic scattering problems with multiple excitations using the recompressed adaptive cross approximation,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • L. Gürel, “Fast multipole methods in service of various scientific disciplines,” 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA, July 2014.
  • Ö. Ergül and L. Gürel, “Fast and accurate analysis of optical metamaterials using surface integral equations and the parallel multilevel fast multipole algorithm,” International Conference on Electromagnetics in Advanced Applications (ICEAA 13), Torino, Italy, Sept. 2013.
  • A. Etminan and L. Gürel, “Microwave imaging of three-dimensional conducting objects using the Newton minimization approach,” Computational Electromagnetics Workshop (CEM’13), İzmir, Turkey, Aug. 2013.
  • M. Kazempour and L. Gürel, “Solution of low-frequency electromagnetics problems using hierarchical matrices,” Computational Electromagnetics Workshop (CEM’13), İzmir, Turkey, Aug. 2013.
  • M. Hidayetoğlu, B. Karaosmanoğlu, and L. Gürel, “Reducing MLFMA memory with out-of-core implementation and data-structure parallelization,” Computational Electromagnetics Workshop (CEM’13), İzmir, Turkey, Aug. 2013.
  • M. Takrimi and L. Gürel, “Windowed equivalence principle for open surfaces,” Computational Electromagnetics Workshop (CEM’13), İzmir, Turkey, Aug. 2013.
  • L. Gürel, “Recursive algorithms: early years of developing fast solvers with Prof. Chew at UIUC Electromagnetics Laboratory,” 2013 International Workshop on Electromagnetic Theory, Modelling and Simulation, University of Electronic Science and Technology of China (UESTC), Chengdu, China, June 2013.
  • L. Gürel, “Parallel-MLFMA solutions of very large benchmark problems in computational electromagnetics,” 2013 International Workshop on Electromagnetic Theory, Modelling and Simulation, University of Electronic Science and Technology of China (UESTC), Chengdu, China, June 2013.
  • Ö. Ergül and L. Gürel, “A web-based tool for benchmarking the accuracy of solutions of some canonical electromagnetics problems,” European Conference on Antennas and Propagation (EuCAP 2013), Gothenburg, Sweden, April 2013.
  • L. Gürel, “Application of a Parallel MLFMA to Composite Structures With Arbitrary Material Properties,” The 29th International Review of Progress in Applied Computational Electromagnetics (ACES 2013), Monterey, CA, March 2013.
  • L. Gürel, “Accuracy considerations for the integral-equation sol utions of some canonical problems,” 6th LEMA-EPFL One-Day Workshop on Integral Techniques for Electromagnetics (INTELECT 2012), Sevilla, Spain, Oct. 2012.
  • L. Gürel, “Advanced numerical techniques for the scattering of waves by dielectric scatterers,” 14th International Conference on Mathematical Methods In Electromagnetic Theory, Kharkiv, Ukraine, Aug. 2012.
  • L. Gürel, “Solution of extremely large integral-equations in computational electromagnetics,” 2012 Indian Antenna Week (IAW), Gangtok, India, May 2012.
  • L. Gürel, “Efficient parallelization of the multilevel fast multipole algorithm (MLFMA),” 2012 Indian Antenna Week (IAW), Gangtok, India, May 2012.
  • Ö. Ergül and L. Gürel, “Parallel-MLFMA solutions of large-scale problems involving composite objects,” 2012 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Chicago, Illinois, USA, July 2012.
  • Ö. Ergül and L. Gürel, “Analysis of composite objects involving multiple dielectric and metallic partswith the parallel multilevel fast multipole algorithm,” The 28th International Review of Progress in Applied Computational Electromagnetics (ACES 2012), Columbus, Ohio, April 2012.
  • Ö. Ergül and L. Gürel, “Rigorous solutions of large-scale dielectric problems with the parallel multilevel fast multipole algorithm,” XXX URSI General Assembly and Scientific Symposium, Istanbul, Turkey, Aug. 2011.
  • Ö. Ergül and L. Gürel, “Analysis of double-negative materials with the surface integral equations and the multilevel fast multipole algorithm,” Computational Electromagnetics Workshop (CEM’11), İzmir, Turkey, Aug. 2011.
  • L. Gürel and Ö. Ergül, “Accuracy and efficiency considerations in the solution of extremely large electromagnetics problems,” Computational Electromagnetics Workshop (CEM’11), İzmir, Turkey, Aug. 2011.
  • Ö. Ergül and L. Gürel, “Benchmark solutions of large problems for evaluating accuracy and efficiency of electromagnetics solvers,” 2011 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Spokane, Washington, USA, July 2011.
  • Ö. Ergül and L. Gürel, “Analysis of lossy dielectric objects with the multilevel fast multipole algorithm,” 2011 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Spokane, Washington, USA, July 2011.
  • L. Gürel, “Ideas for the parallelization of (multilevel) fast multipole solvers on various dissimilar parallel computers,” 2011 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Spokane, Washington, USA, July 2011.
  • Ö. Ergül and L. Gürel, “Extremely large electromagnetics problems: are we going in the right direction?,” 24th Biennial Conference on Numerical Analysis, Glasgow, Scotland, UK, June-July 2011.
  • L. Gürel and Ö. Ergül, “Emphasizing the accuracy and efficiency aspects of solutions of extremely large benchmark problems in computational electromagnetics,” Workshop on Advanced Techniques in Computational Electromagnetics (AT-CEM’11), Glasgow, Scotland, UK, June 2011.
  • L. Gürel, “Accuracy aspect of the MLFMA solutions of extremely large electromagnetics problems,” 2011 International Workshop on Electromagnetic Theory, Modeling, and Simulation, Chengdu, China, June 2011.
  • Ö. Ergül and L. Gürel, “Accuracy: the frequently overlooked parameter in the solution of extremely large problems,” European Conference on Antennas and Propagation (EuCAP 2011), Rome, Italy, April 2011.
  • L. Gürel, “Solutions of extremely large integral-equation problems involving hundreds of millions of unknowns and their applications in computational electromagnetics,” Plenary Talk, The 27th International Review of Progress in Applied Computational Electromagnetics (ACES 2011), Williamsburg, Virginia, USA, March 2011.
  • L. Gürel and Ö. Ergül, “LL basis functions: half-order increase over RWG functions significantly improves MFIE and CFIE results,” The 27th International Review of Progress in Applied Computational Electromagnetics (ACES 2011), Williamsburg, Virginia, March 2011.
  • D. Doğan, M. E. İnal, A. Manyas, and L. Gürel, “Validation of RCS reduction with radar absorbing materials on canonical geometries,” in Turkish, URSI-Turkey 2010 Scientific Symposium, NCTR, Aug. 2010.
  • Ö. Ergül and L. Gürel, “An efficient parallel implementation of the multilevel fast multipole algorithm for rigorous solutions of large-scale scattering problems,” EMTS 2010 International Symposium on Electromagnetic Theory, Berlin, Germany, Aug. 2010.
  • L. Gürel, T. Malas, and Ö. Ergül, “Preconditioning iterative MLFMA solutions of integral equations,” EMTS 2010 International Symposium on Electromagnetic Theory, Berlin, Germany, Aug. 2010.
  • Ö. Ergül and L. Gürel, “Advanced partitioning and communication strategies for the efficient parallelization of the multilevel fast multipole algorithm,” 2010 IEEE International Symposium on Antennas and Propagation and CNC/USNC/URSI Radio Science Meeting, Toronto, Ontario, Canada, July 2010.
  • T. Malas and L. Gürel, “Iterative solution of dielectric waveguide problems via Schur complement preconditioners,” 2010 IEEE International Symposium on Antennas and Propagation and CNC/USNC/URSI Radio Science Meeting, Toronto, Ontario, Canada, July 2010.
  • Ö. Ergül, A. Arslan-Ergül, and L. Gürel, “Rigorous solutions of scattering problems involving red blood cells,” European Conference on Antennas and Propagation (EuCAP 2010), Barcelona, Spain, April 2010.
  • L. Gürel and Ö. Ergül, “Rigorous solutions of large-scale scattering problems discretized with hundreds of millions of unknowns,” International Conference on Electromagnetics in Advanced Applications (ICEAA), Torino, Italy, Sept. 2009.
  • Ö. Ergül and L. Gürel, “Fast and accurate analysis of complicated metamaterial structures using a low-frequency multilevel fast multipole algorithm,” International Conference on Electromagnetics in Advanced Applications (ICEAA), Torino, Italy, Sept. 2009.
  • T. Malas and L. Gürel, “Approximate Schur preconditioners for efficient solutions of dielectric problems formulated with surface integral equations,” Computational Electromagnetics Workshop (CEM’09), İzmir, Turkey, July 2009.
  • Ö. Ergül, T. Malas, S. Kılınç, S. Sarıtas, and L. Gürel, “Analysis of photonic-crystal problems with MLFMA and approximate Schur preconditioners,” Computational Electromagnetics Workshop (CEM’09), İzmir, Turkey, July 2009.
  • A. Manyas, Ö. Ergül, and L. Gürel, “Hybridizing physical optics with MLFMA for efficient scattering computations of three-dimensional complex targets,” Computational Electromagnetics Workshop (CEM’09), İzmir, Turkey, July 2009.
  • Ö. Ergül, and L. Gürel, “Fast and accurate solutions of extremely large scattering problems involving three-dimensional canonical and complicated objects,” Computational Electromagnetics Workshop (CEM’09), İzmir, Turkey, July 2009.
  • Ö. Ergül and L. Gürel, “Numerical analysis of three-dimensional frequency-selective structures using the multilevel fast multipole algorithm,” 23rd Biennial Conf. on Numerical Analysis, Glasgow, UK, June 2009.
  • Ö. Ergül and L. Gürel, “Preconditioned MLFMA solution of multiple dielectric-metallic composite objects with the electric and magnetic current combined-field integral equation (JMCFIE),” 2009 IEEE International Symposium on Antennas and Propagation and 2009 USNC/URSI National Radio Science Meeting, Charleston, South Carolina, USA, June 2009.
  • Ö. Ergül and L. Gürel, “Solutions of electromagnetics problems involving hundreds of millions of unknowns with parallel multilevel fast multipole algorithm,” 2009 IEEE International Symposium on Antennas and Propagation and 2009 USNC/URSI National Radio Science Meeting, Charleston, South Carolina, USA, June 2009.
  • Ö. Ergül and L. Gürel, “On the errors arising in surface integral equations due to the discretization of the identity operator,” 2009 IEEE International Symposium on Antennas and Propagation and 2009 USNC/URSI National Radio Science Meeting, Charleston, South Carolina, USA, June 2009.
  • T. Malas and L. Gürel, “Effective parallelization of the sparse-approximate-inverse preconditioner for the solution of large-scale integral-equation problems,” 2009 IEEE International Symposium on Antennas and Propagation and 2009 USNC/URSI National Radio Science Meeting, Charleston, South Carolina, USA, June 2009.
  • T. Malas and L. Gürel, “An effective preconditioner based on the Schur complement reduction for integral-equation formulations of dielectric problems,” 2009 IEEE International Symposium on Antennas and Propagation and 2009 USNC/URSI National Radio Science Meeting, Charleston, South Carolina, USA, June 2009.
  • P. Yla-Oijala, Ö. Ergül, L. Gürel, and M. Taskinen, “Efficient surface integral equation methods for the analysis of complex metamaterial structures,” European Conference on Antennas and Propagation (EuCAP 2009), Berlin, Germany, March 2009.
  • Ö. Ergül and L. Gürel, “Contamination of the accuracy of the surface integral equations with the discretization error of the identity operator,” Vth International Workshop on Electromagnetic Wave Scattering (EWS), Antalya, Turkey, Oct. 2008.
  • Ö. Ergül and L. Gürel, “Field-based-stabilized combined tangential formulation for the accurate solution of scattering problems involving low-contrast dielectric objects,” Vth International Workshop on Electromagnetic Wave Scattering (EWS), Antalya, Turkey, Oct. 2008.
  • T. Malas and L. Gürel, “Iterative block near-field preconditioners for surface integral-equation formulations of dielectric problems,” Vth International Workshop on Electromagnetic Wave Scattering (EWS), Antalya, Turkey, Oct. 2008.
  • Ö. Ergül and L. Gürel, “Hierarchical parallelization of MLFMA for the efficient solution of large-scale electromagnetics problems,” Vth International Workshop on Electromagnetic Wave Scattering (EWS), Antalya, Turkey, Oct. 2008.
  • B. Tiryaki, A. Ünal, Ö. Ergül, and L. Gürel, “Computations and comparisons of radar-cross-section values of various airborne targets by using parallel multilevel fast multipole algorithm,” in Turkish, URSI-Turkey 2008 Scientific Symposium, Antalya, Turkey, Oct. 2008.
  • S. Kılınç, Ö. Ergül, and L. Gürel, “Investigation of electromagnetic transmission properties of finite periodic dielectric structures by using integral equations and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey 2008 Scientific Symposium, Antalya, Turkey, Oct. 2008.
  • A. Ünal, Ö. Ergül, and L. Gürel, “Investigation of complicated metamaterial structures with low-frequency multilevel fast multipole algorithm,” in Turkish, URSI-Turkey 2008 Scientific Symposium, Antalya, Turkey, Oct. 2008.
  • Ö. Ergül, and L. Gürel, “Solutions of electromagnetics problems involving large dielectric objects with the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey 2008 Scientific Symposium, Antalya, Turkey, Oct. 2008.
  • L. Gürel, Ö. Ergül, and T. Malas, “Solutions of extremely large electromagnetics problems involving tens of millions of unknowns using parallel MLFMA and preconditioners,” XXIX General Assembly of the International Union of Radio Science, Chicago, Illinois, USA, Aug. 2008.
  • T. Malas and L. Gürel, “Preconditioning large integral-equation problems involving complex targets,” 2008 IEEE International Symposium on Antennas and Propagation and the 2008 USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 2008.
  • Ö. Ergül and L. Gürel, “Hierarchical parallelization of the multilevel fast multipole algorithm for the efficient solution of large-scale scattering problems,” 2008 IEEE International Symposium on Antennas and Propagation and the 2008 USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 2008.
  • W. C. Chew, C. P. Davis, K. F. Warnick, Z. P. Nie, J. Hu, S. Yan, and L. Gürel, “EFIE and MFIE, why the difference?,” 2008 IEEE International Symposium on Antennas and Propagation and the 2008 USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 2008.
  • Ö. Ergül and L. Gürel, “Solution of large-scale scattering problems with the multilevel fast multipole algorithm parallelized on distributed-memory architectures,” 22nd International Symposium on Computer and Information Sciences (ISCIS07), Ankara, Turkey, Nov. 2007.
  • T. Malas, Ö. Ergül, and L. Gürel, “Parallel preconditioners for solutions of dense linear systems with tens of millions of unknowns,” 22nd International Symposium on Computer and Information Sciences (ISCIS07), Ankara, Turkey, Nov. 2007.
  • Ö. Ergül, T. Malas, Ç. Yavuz, A. Ünal, and L. Gürel, “Computational analysis of complicated metamaterial structures using MLFMA and nested preconditioners,” European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK, Nov. 2007.
  • T. Malas, Ö. Ergül, and L. Gürel, “Effective preconditioners for large integral-equation problems,” European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK, Nov. 2007.
  • Ö. Ergül and L. Gürel, “Accurate solutions of scattering problems involving low-contrast dielectric objects with surface integral equations,” European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK, Nov. 2007.
  • T. Malas and L. Gürel, “Solution of large EFIE problems via preconditioned multilevel fast multipole algorithm,” European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK, Nov. 2007.
  • Ö. Ergül and L. Gürel, “Parallel-MLFMA solution of CFIE discretized with tens of millions of unknowns,” European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK, Nov. 2007.
  • L. Gürel, Ö. Ergül, and A. Manyas, “PO-MLFMA hybrid technique for the solution of electromagnetic scattering problems involving complex targets,” European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK, Nov. 2007.
  • Ö. Ergül, T. Malas, A. Ünal, and L. Gürel “Solutions of large integral-equation problems with preconditioned MLFMA,” 37th European Microwave Conference (EuMC), Munich, Germany, Oct. 2007.
  • Ö. Ergül, T. Malas, and L. Gürel, “Solution of extremely large integral-equation problems,” International Conference on Electromagnetics in Advanced Applications (ICEAA 07), Torino, Italy, Sept. 2007.
  • Ö. Ergül and L. Gürel, “Fast and accurate solutions of scattering problems involving dielectric objects with moderate and low contrasts,” Computational Electromagnetics Workshop (CEM’07), İzmir, Turkey, Aug. 2007.
  • Ö. Ergül, Alper Ünal, and Levent Gürel, “MLFMA solutions of transmission problems involving realistic metamaterial walls,” Computational Electromagnetics Workshop (CEM’07), İzmir, Turkey, Aug. 2007.
  • Tahir Malas, Ö. Ergül, and L. Gürel, “Sequential and parallel preconditioners for large-scale integral-equation,” Computational Electromagnetics Workshop (CEM’07), İzmir, Turkey, Aug. 2007.
  • Alp Manyas and L. Gürel, “Memory-efficient multilevel physical optics algorithm for fast computation of scattering from three-dimensional complex targets,” Computational Electromagnetics Workshop (CEM’07), İzmir, Turkey, Aug. 2007.
  • L. Gürel and Ö. Ergül, “Efficient solution of the combined-field integral equation with the parallel multilevel fast multipole algorithm,” Computational Electromagnetics Workshop (CEM’07), İzmir, Turkey, Aug. 2007.
  • Ö. Ergül, A. Ünal, T. Malas, and L. Gürel, “Integral-equation-based approach for the accurate analysis of metamaterials,” NanoTR-III Nanoscience and Nanotechnology Conference, Ankara, Turkey, June 2007.
  • L. Gürel and A. Manyas, “Multilevel physical optics algorithm for fast solution of scattering problems involving nonuniform triangulations,” 2007 IEEE International Symposium on Antennas and Propagation, Honolulu, Hawai'i, USA, June 2007.
  • T. Malas, Ö. Ergül, and L. Gürel, “Approximate MLFMA as an efficient preconditioner,” 2007 IEEE International Symposium on Antennas and Propagation, Honolulu, Hawai'i, USA, June 2007.
  • Ö. Ergül, Ç. Yavuz, A. Ünal, and L. Gürel, “Investigation of Various Metamaterial Structures Using Multilevel Fast Multipole Algorithm,” 2007 IEEE International Symposium on Antennas and Propagation, Honolulu, Hawai'i, USA, June 2007.
  • Ö. Ergül and L. Gürel, “Iterative solution of the normal-equations form of the electric-field integral equation,” 2007 IEEE International Symposium on Antennas and Propagation, Honolulu, Hawai'i, USA, June 2007.
  • Ö. Ergül and L. Gürel, “Improving the accuracy of the surface integral equations for low-contrast dielectric scatterers,” 2007 IEEE International Symposium on Antennas and Propagation, Honolulu, Hawai'i, USA, June 2007.
  • Ö. Ergül and L. Gürel, “Fast and accurate solutions of large-scale scattering problems with parallel multilevel fast multipole algorithm,” 2007 IEEE International Symposium on Antennas and Propagation, Honolulu, Hawai'i, USA, June 2007.
  • L. Gürel, Ö. Ergül, and A. Ünal, “Accurate analysis of metamaterials involving finite arrays of split-ring resonators and thin wires,” PIERS 2007 Progress in Electromagnetics Research Symposium, Beijing, China, March 2007.
  • L. Gürel, T. Malas, and Ö. Ergül, “Efficient preconditioning strategies for the multilevel fast multipole algorithm,” PIERS 2007 Progress in Electromagnetics Research Symposium, Beijing, China, March 2007.
  • L. Gürel, Ö. Ergül, and T. Malas, “Solutions of large integral-equation problems with parallel preconditioned MLFMA,” The 23rd International Review of Progress in Applied Computational Electromagnetics (ACES 2007), Verona, Italy, March 2007.
  • L. Gürel, Ö. Ergül, and A. Ünal, “Investigation of transmission properties of multilayer metamaterial structures with MLFMA,” The 23rd International Review of Progress in Applied Computational Electromagnetics (ACES 2007), Verona, Italy, March 2007.
  • L. Gürel, T. Malas, and Ö. Ergül, “Preconditioning the MLFMA solution of EFIE with nested flexible iterative solvers,” SIAM Conference on Computational Science and Engineering, Costa Mesa, California, USA, Feb. 2007.
  • A. Manyas and L. Gürel, “Multilevel PO algorithm for non-uniform triangulations,” European Conference on Antennas and Propagation (EuCAP 2006), Nice, France, Nov. 2006.
  • T. Malas and L. Gürel, “Incomplete LU preconditioning for the electric-field integral equation,” European Conference on Antennas and Propagation (EuCAP 2006), Nice, France, Nov. 2006.
  • Ö. Ergül, A. Ünal, and L. Gürel, “Accurate modeling of metamaterials with MLFMA,” European Conference on Antennas and Propagation (EuCAP 2006), Nice, France, Nov. 2006.
  • Ö. Ergül and L. Gürel, “Efficient parallelization of multilevel fast multipole algorithm,” European Conference on Antennas and Propagation (EuCAP 2006), Nice, France, Nov. 2006.
  • Ö. Ergül and L. Gürel, “Circular arrays of log-periodic antennas for broadband applications,” European Conference on Antennas and Propagation (EuCAP 2006), Nice, France, Nov. 2006.
  • Ö. Ergül and L. Gürel, “On the accuracy of MFIE and CFIE in the solution of large electromagnetic scattering problems,” European Conference on Antennas and Propagation (EuCAP 2006), Nice, France, Nov. 2006.
  • L. Gürel, “Solutions of large problems of computational electromagnetics at Bilkent University,” IV. International Workshop on Electromagnetic Wave Scattering, Gebze, Turkey, Sept. 2006.
  • T. Malas and L. Gürel, “Effective preconditioning techniques for iterative solutions of integral-equation methods,” IV. International Workshop on Electromagnetic Wave Scattering, Gebze, Turkey, Sept. 2006.
  • Ö. Ergül and L. Gürel, “Rigorous analysis of circular log-periodic arrays using the multilevel fast multipole algorithm,” IV. International Workshop on Electromagnetic Wave Scattering, Gebze, Turkey, Sept. 2006.
  • Ö. Ergül, A. Ünal, and L. Gürel, “Efficient and accurate analysis of large metamaterial structures with the multilevel fast multipole algorithm,” IV. International Workshop on Electromagnetic Wave Scattering, Gebze, Turkey, Sept. 2006.
  • Ö. Ergül, F. Akdeniz, and L. Gürel, “Efficient and accurate electromagnetic simulation of double-ridged horn antennas with the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • L. Gürel, Ö. Ergül, and T. Malas, “Parallel MLFMA solution of large integral-equation problems,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • T. Malas and L. Gürel, “A parallel sparse approximate inverse preconditioner for the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • T. Malas and L. Gürel, “Incomplete LU preconditioners for surface integral equations,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • T. Malas and L. Gürel, “Using nested solvers as effective preconditioners in computational electromagnetics,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • A. Manyas and L. Gürel, “Solution of high-frequency scattering problems of complex geometries via multilevel PO algorithm,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • Ö. Ergül and L. Gürel, “Parallelization of the multilevel fast multipole algorithm for the solution of three-dimensional arbitrary geometries,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • Ö. Ergül, A. Ünal, and L. Gürel, “Electromagnetic simulation of large metamaterial structures,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • Ö. Ergül and L. Gürel, “Solution of composite geometries with open and closed surfaces via the hybrid-field integral equation,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • Ö. Ergül and L. Gürel, “Investigation of integral-equation formulations for iterative solutions of dielectric bodies,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • Ö. Ergül and L. Gürel, “Least-squares solution of the electric-field integral equation," in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • Ö. Ergül and L. Gürel, “Efficient Solutions of circular arrays of log-periodic antennas via the electric-field integral equation,” in Turkish, URSI-Turkey 2006 Scientific Symposium, Ankara, Turkey, Sept. 2006.
  • L. Gürel, A. Ünal, and Ö. Ergül, “Electromagnetic modeling of split-ring resonators,” 36th European Microwave Conference 2006, Manchester, UK, Sept. 2006.
  • L. Gürel and Ö. Ergül, “Iterative solution of composite problems with the combined-field integral equation,” 36th European Microwave Conference 2006, Manchester, UK, Sept. 2006.
  • L. Gürel, Ö. Ergül, T. Malas, and A. Ünal, “Preconditioned parallel MLFMA solution of metamaterial structures,” PIERS 2006 Progress in Electromagnetics Research Symposium, Tokyo, Japan, Aug. 2006.
  • L. Gürel, Ö. Ergül, and A. Ünal, “MLFMA modeling of metamaterials containing split-ring resonators,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting and AMEREM Meeting, Albuquerque, New Mexico, USA, July 2006.
  • T. Malas and L. Gürel, “Incomplete LU preconditioning strategies for MLFMA,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting and AMEREM Meeting, Albuquerque, New Mexico, USA, July 2006.
  • L. Gürel and T. Malas, “Variable preconditioning with nested iterations employing MLFMA,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting and AMEREM Meeting, Albuquerque, New Mexico, USA, July 2006.
  • Ö. Ergül and L. Gürel, “Design of circular log-periodic arrays using electromagnetic simulations,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting and AMEREM Meeting, Albuquerque, New Mexico, USA, July 2006.
  • L. Gürel and Ö. Ergül, “Investigations of load balancing, communications, and scalability in parallel MLFMA,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting and AMEREM Meeting, Albuquerque, New Mexico, USA, July 2006.
  • Ö. Ergül and L. Gürel, “On the lagrange interpolation in multilevel fast multipole algorithm,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting and AMEREM Meeting, Albuquerque, New Mexico, USA, July 2006.
  • L. Gürel, Ö. Ergül, and T. Malas, “Preconditioned iterative solution of the combined-field integral equation with the MLFMA,” PIERS 2005 Progress in Electromagnetics Research Symposium, Hangzhou, China, Aug. 2005.
  • Ö. Ergül and L. Gürel, “Hybrid CFIE-EFIE solution of composite geometries with coexisting open and closed surfaces,” 2005 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Washington, DC, USA, July 2005.
  • Ö. Ergül and L. Gürel, “Iterative least-squares solution of the combined-field integral equation,” 2005 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Washington, DC, USA, July 2005.
  • L. Gürel and Ö. Ergül, “Solution of large CEM problems with parallel multi-level fast multipole algorithm (MLFMA),” 2005 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Washington, DC, USA, July 2005.
  • F. Yıldırım and L. Gürel, “Coupled deconvolution for frequency extrapolation of electromagnetic solutions with matrix pencil method,” 2005 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Washington, DC, USA, July 2005.
  • F. Yıldırım and L. Gürel, “Coupled matrix pencil method for frequency extrapolation of electromagnetic solutions,” 2005 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Washington, DC, USA, July 2005.
  • Ö. Ergül and L. Gürel, “Combined-field solution of composite geometries involving open and closed conducting surfaces,” 2005 IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, Hawaii, USA, April 2005.
  • L. Gürel and T. Malas, “Algebraic properties of preconditioned dense linear systems arising in computational electromagnetics,” SIAM Conference on Computational Science and Engineering, Orlando, Florida, USA, Feb. 2005.
  • F. Yıldırım and L. Gürel, “Extrapolation of frequency domain solution of electromagnetic problems with matrix pencil method,” in Turkish, URSI-Turkey 2004 Scientific Symposium, Ankara, Turkey, Sept. 2004.
  • Ö. Ergül, A. R. Bozbulut, and L. Gürel, “Parallelization of the multi-level fast multipole method for the solution of large electromagnetic scattering problems,” in Turkish, URSI-Turkey 2004 Scientific Symposium, Ankara, Turkey, Sept. 2004.
  • Ö. Ergül and L. Gürel, “The use of linear basis functions for the magnetic-field integral equation,” in Turkish, URSI-Turkey 2004 Scientific Symposium, Ankara, Turkey, Sept. 2004.
  • Ö. Ergül and L. Gürel, “Problems in the use of the RWG functions for the magnetic-field integral equation,” in Turkish, URSI-Turkey 2004 Scientific Symposium, Ankara, Turkey, Sept. 2004.
  • Ö. Ergül and L. Gürel, “Improving the accuracy of the MFIE with the choice of basis functions,” 2004 IEEE AP-S International Symposium and URSI Radio Science Meeting, Monterey, CA, June 2004.
  • Ö. Ergül and L. Gürel, “Investigation of the inaccuracy of the MFIE discretized with the RWG basis functions,” 2004 IEEE AP-S International Symposium and URSI Radio Science Meeting, Monterey, CA, June 2004.
  • L. Gürel, “3-D FDTD simulations of ground penetrating radar scenarios,” PIERS 2004 Progress in Electromagnetics Research Symposium, Pisa, Italy, Mar. 2004.
  • L. Gürel and Ö. Ergül, “EFIE, MFIE, and CFIE solutions of electromagnetic scattering problems,” PIERS 2003 Progress in Electromagnetics Research Symposium, Honolulu, Hawaii, USA, Oct. 2003.
  • L. Gürel and U. Oğuz, “Three-dimensional electromagnetic modeling of various GPR problems,” PIERS 2003 Progress in Electromagnetics Research Symposium, Honolulu, Hawaii, USA, Oct. 2003.
  • Ö. Ergül and L. Gürel, “Comparisons of FMM implementations employing different formulations and iterative solvers,” 2003 IEEE AP-S International Symposium and USNC/CNC/URSI National Radio Science Meeting, Columbus, Ohio, USA, June 2003.
  • Ö. Ergül and L. Gürel, “Log-periodic antenna design using electromagnetic simulations,” 2003 IEEE AP-S International Symposium and USNC/CNC/URSI National Radio Science Meeting, Columbus, Ohio, USA, June 2003.
  • U. Oğuz and L. Gürel, “FDTD simulations of multiple GPR systems,” 2003 IEEE AP-S International Symposium and USNC/CNC/URSI National Radio Science Meeting, Columbus, Ohio, USA, June 2003.
  • L. Gürel, "Electromagnetic modelling and simulation," in Turkish, Symposium: Modelling and Simulation for Defense Applications, Ankara, Turkey, May 2003.
  • L. Gürel, Ö. Ergül, and H. Bağcı, “Computation of the bistatic RCS of stealth airborne targets via the fast multipole method,” PIERS 2003 Progress in Electromagnetics Research Symposium, Singapore, Jan. 2003.
  • L. Gürel, “Domestic R&D contributions for national defense projects,” in Turkish, Symposium on Strategic Relations in the Defense Industry, Ankara, Turkey, Nov. 2002.
  • Ö. Ergül and L. Gürel, “Solution of the electromagnetic scattering problems with the fast multipole method,” in Turkish, High Performance Computing Symposium, Gebze Institute of Technology, Kocaeli, Turkey, Oct. 2002.
  • C. Cengiz Yıldırım and L. Gürel, “Electromagnetic method of moments in the presence of an infinitely large conducting plane,” in Turkish, URSI-Turkey’2002 Scientific Conference and National General Assembly Meeting, İstanbul Technical University, İstanbul, Turkey, Sept. 2002.
  • L. Gürel and U. Oğuz, “Electromagnetic simulations of ground penetrating radars,” in Turkish, URSI-Turkey’2002 Scientific Conference and National General Assembly Meeting, İstanbul Technical University, İstanbul, Turkey, Sept. 2002.
  • L. Gürel, “Electromagnetic compatibility simulations,” in Turkish, URSI-Turkey’2002 Scientific Conference and National General Assembly Meeting, İstanbul Technical University, İstanbul, Turkey, Sept. 2002.
  • Ö. Ergül and L. Gürel, “Broadband log-periodic antenna-array design using genetic algorithms in an electromagnetic simulation environment,” in Turkish, URSI-Turkey’2002 Scientific Conference and National General Assembly Meeting, İstanbul Technical University, İstanbul, Turkey, Sept. 2002.
  • Ö. Ergül and L. Gürel, “Electric-field, magnetic-field, and combined-field integral equations for electromagnetic scattering problems,” in Turkish, URSI-Turkey’2002 Scientific Conference and National General Assembly Meeting, İstanbul Technical University, İstanbul, Turkey, Sept. 2002.
  • L. Gürel and H. Bağcı, “FMM computation of the bistatic RCS of stealth and nonstealth targets,” 2002 IEEE AP S International Symposium and URSI National Radio Science Meeting, San Antonio, Texas, USA, June 2002.
  • L. Gürel and U. Oğuz, “Application of signal processing techniques to reduce the errors related to the FDTD excitations,” 2001 IEEE AP S International Symposium and USNC/URSI National Radio Science Meeting, Boston, Massachusetts, USA, July 2001.
  • U. Oğuz and L. Gürel, “Simulation of TRT configured ground penetrating radars over heterogeneous grounds,” 2001 IEEE AP S International Symposium and USNC/URSI National Radio Science Meeting, Boston, Massachusetts, USA, July 2001.
  • U. Oğuz and L. Gürel, “On the frequency band selection for ground penetrating radars operating over lossy and heterogeneous grounds,” 2001 IEEE AP S International Symposium and USNC/URSI National Radio Science Meeting, Boston, Massachusetts, USA, July 2001.
  • L. Gürel, “The importance of electromagnetic compatibility (EMC) in military systems and EMC education,” in Turkish, Space Symposium: Global Space Activities and Potential in Turkey, Ankara, Turkey, pp. 395-402, May 2001.
  • L. Gürel and U. Oğuz, “Design and electromagnetic modelling of radars detecting land mines,” in Turkish, Space Symposium: Global Space Activities and Potential in Turkey, Ankara, Turkey, pp. 403-410, May 2001.
  • L. Gürel and H. Bağcı, “The use of RCS computations in developing and precluding stealth techniques and radar design,” in Turkish, Space Symposium: Global Space Activities and Potential in Turkey, Ankara, Turkey, pp. 443-449, May 2001.
  • L. Gürel and Ö. Ergül, “Design of broadband log periodic antenna arrays using genetic algorithms,” in Turkish, Space Symposium: Global Space Activities and Potential in Turkey, Ankara, Turkey, pp. 411-416, May 2001.
  • L. Gürel, “Electromagnetic compatibility (EMC) in defense systems and EMC education,” in Turkish, National Defense Industry Symposium, Ankara, Turkey, Nov. 2000.
  • U. Oğuz and L. Gürel, “Electromagnetic modeling of mine detection systems,” in Turkish, National Defense Industry Symposium, Ankara, Turkey, Nov. 2000.
  • L. Gürel and U. Oğuz, “Radar cross section (RCS) computation of military targets and development of invisibility (stealth) techniques,” in Turkish, National Defense Industry Symposium, Ankara, Turkey, Nov. 2000.
  • U. Oğuz and L. Gürel, “Three-dimensional FDTD modeling of a GPR,” Proceedings of the 2000 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Salt Lake City, Utah, USA, July 2000.
  • L. Gürel and U. Oğuz, “Simulation of realistic three-dimensional GPR scenarios using the FDTD method,” Progress in Electromagnetics Research Symposium, Cambridge, Massachusetts, USA, July 2000.
  • L. Gürel, “Electromagnetic compatibility standards and computer simulations,” in Turkish, Proceedings of the 1999 Symposium of Effects of Electromagnetic Pollution, pp. 61-64, Ankara, Turkey, Nov. 1999.
  • L. Gürel and U. Oğuz, “Employing PML absorbers in the design and simulation of ground penetrating radars,” Proceedings of the 1999 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, pp. 1890-1893, Orlando, Florida, USA, July 1999.
  • L. Gürel, A. E. Yılmaz, and W. C. Chew, “Fast computation of scattering from (near-)resonant structures,” Proceedings of the 1999 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, pp. 1174-1177, Orlando, Florida, USA, July 1999.
  • L. Gürel and İ. K. Şendur, “Computational ınvestigation of radiation from conducting boxes with arbitrary apertures,” International Symposium on Electromagnetic Compatibility, Rome, Italy, Sept. 1998.
  • L. Gürel, K. Sertel, and İ. K. Şendur, “On the charge-modeling capabilities of a class of current basis functions,” Progress in Electromagnetics Research Symposium, Nantes, France, July 1998.
  • F. Çalışkan, M. I. Aksun, and L. Gürel, “Efficient methods for electromagnetic characterization of 2-D geometries in stratified media,” 1998 IEEE AP-S International Symposium and URSI North American Radio Science Meeting, Atlanta, GA, June 1998.
  • L. Gürel and W. C. Chew, “Fast noniterative steepest descent path algorithm for planar and quasi-planar patch geometries,” 1998 IEEE AP-S International Symposium and URSI North American Radio Science Meeting, Atlanta, GA, June 1998.
  • L. Gürel and W. C. Chew, “Fast Direct (Noniterative) Solvers for ıntegral-equation formulations of scattering problems,” 1998 IEEE AP-S International Symposium and URSI North American Radio Science Meeting, Atlanta, GA, June 1998.
  • İ. K. Şendur and L. Gürel, “Solution of radiation problems using the fast multipole method,” 1997 IEEE AP-S International Symposium and URSI Radio Science Meeting, Montréal, Canada, July 1997.
  • K. Sertel and L. Gürel, “A comparison of surface-modeling techniques,” 1997 IEEE AP-S International Symposium and URSI Radio Science Meeting, Montréal, Canada, July 1997.
  • L. Gürel, İ. K. Şendur, and K. Sertel, “Quantitative comparison of rooftop and RWG basis functions,” 1997 IEEE AP-S International Symposium and URSI Radio Science Meeting, Montréal, Canada, July 1997.
  • L. Gürel and W. C. Chew, “Fast direct solution algorithm for electromagnetic scattering from 3D planar and quasi-planar geometries,” 1997 IEEE AP-S International Symposium and URSI Radio Science Meeting, Montréal, Canada, July 1997.
  • U. Oğuz and L. Gürel, “Subsurface-scattering calculations via the 3D FDTD method employing PML ABC for layered media,” 1997 IEEE AP-S International Symposium and URSI Radio Science Meeting, Montréal, Canada, July 1997.
  • L. Gürel, U. Oğuz, and O. Arıkan, “Accurate plane-wave excitation in the FDTD method,” 1997 IEEE AP-S International Symposium and URSI Radio Science Meeting, Montréal, Canada, July 1997.
  • K. Sertel and L. Gürel, “FMM solution of electromagnetic scattering problems involving curved surfaces,” Progress in Electromagnetics Research Symposium, Cambridge, MA, July 1997.
  • İ. K. Şendur and L. Gürel, “FMM solution of large three-dimensional electromagnetics problems with arbitrary surface triangulations,” Progress in Electromagnetics Research Symposium, Cambridge, MA, July 1997.
  • L. Gürel, “Fast algorithms for the RCS computations of complex and large targets,” in Turkish, Symposium for the Technological Progress in the Defense Industry, Ankara, Turkey, June 1997.
  • L. Gürel, “Electromagnetic modeling of the GPR (ground penetrating radar) and scenario simulations,” in Turkish, Symposium for the Technological Progress in the Defense Industry, Ankara, Turkey, June 1997.
  • L. Gürel, “Electromagnetic compatibility and computational electromagnetics,” in Turkish, Symposium for the Technological Progress in the Defense Industry, Ankara, Turkey, June 1997.
  • L. Gürel, “Fast RCS computation via the fast multipole method,” NATO AGARD SPP Symposium on Radar Signature Analysis and Imaging of Military Targets, Ankara, Turkey, Oct. 1996.
  • L. Gürel and M. I. Aksun, “Fast multipole method in layered media: 2-D electromagnetic scattering problems,” 1996 IEEE AP-S International Symposium and URSI Radio Science Meeting, Baltimore, MD, July 1996.
  • L. Gürel, “Computational electromagnetics, electromagnetic compatibility and European Community,” in Turkish, 6. National Symposium of Electrical Engineering, Bursa, Turkey, Sept. 1995.
  • L. Gürel, “Fast-multipole-method solution of two-dimensional conductor geometries,” 1995 IEEE AP-S International Symposium and URSI Radio Science Meeting, Newport Beach, CA, June 1995.
  • L. Gürel, S. Daijavad, and B. J. Rubin, “Investigation of the resonances of open rectangular cavities,” 1994 URSI Radio Science Meeting, Seattle, WA, June 1994.
  • L. Gürel and T. Gürel, “Absorbing boundary condition for monochromatic oblique incidence,” Progress in Electromagnetics Research Symposium Proceedings, Pasadena, CA, p. 118, July 1993.
  • L. Gürel, “Fast algorithm for electromagnetic solution of modified-geometry problems,” 1993 IEEE AP-S International Symposium Digest, Ann Arbor, MI, pp. 60-63, June 1993.
  • W. C. Chew, Y. M. Wang, and L. Gürel, “A recursive algorithm using windowed addition theorem,” 1992 IEEE AP-S International Symposium Digest, Chicago, IL, pp. 1587-1590, July 1992.
  • W. C. Chew, Y. M. Wang, L. Gürel, J. H. Lin, and Q. H. Liu, “Fast algorithms for calculating scattering by inhomogeneous and impenetrable objects,” Progress in Electromagnetics Research Symposium Proceedings, Cambridge, MA, p. 699, July 1991.
  • L. Gürel and W. C. Chew, “Recursive T-matrix algorithms for conducting patches,” 1991 North American Radio Science Meeting, Program and Abstracts, London, Ontario, Canada, June 1991.
  • L. Gürel and W. C. Chew, “Recursive T-matrix algorithms for 1-D and 2-D clusterings of strips,” 1991 International IEEE AP-S Symposium Digest, London, Ontario, Canada, June 1991.
  • L. Gürel and W. C. Chew, “On the connection of T matrices and integral equations,” 1991 International IEEE AP-S Symposium Digest, London, Ontario, Canada, June 1991.
  • W. C. Chew, Y. M. Wang, L. Gürel, and J. H. Lin, “Recursive algorithms to reduce the computational complexity of scattering problems,” The 7th Annual Review of Progress in Applied Computational Electromagnetics, Conference Proceedings, Monterey, CA, pp. 278-291, Mar. 1991.
  • W. C. Chew and L. Gürel, “An O(N2) recursive algorithm for calculating the scattering from strips or patches,” 1990 URSI Radio Science Meeting, Program and Abstracts, Dallas, TX, p. 5, May 1990.
  • W. C. Chew and L. Gürel, “Recursive algorithms for calculating the scattering from N strips or disks,” 1989 URSI Radio Science Meeting, Program and Abstracts, San Jose, CA, p. 220, June 1989.
  • L. Gürel and W. C. Chew, “Guidance or resonance conditions for strips or disks embedded in homogeneous and layered media,” 1988 URSI Radio Science Meeting Digest, Syracuse, NY, p. 320, June 1988.
  • W. C. Chew and L. Gürel, “Reflection and transmission operators for strips or disks embedded in homogeneous and layered media,” 1988 URSI Radio Science Meeting Digest, Syracuse, NY, p. 312, June 1988.
  • M. Hidayetoğlu and L. Gürel, “Accelerating Hybrid Integral-Equation and Physical-Optics Solutions with MLFMA,” 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), Gran Canaria, Canary Islands, Spain, May 2015.
  • M. Hidayetoğlu and L. Gürel, “Parallel out-of-core MLFMA on distributed-memory computer architectures,” Computational Electromagnetics Workshop (CEM’15), İzmir, Turkey, July 2015.
  • M. Hidayetoğlu and L. Gürel, “An MPIxOpenMP implementation of the hierarchical parallelization of MLFMA,” Computational Electromagnetics Workshop (CEM’15), İzmir, Turkey, July 2015.
  • M. Salim, A. O. Akkirman, M. Hidayetoğlu, and L. Gürel, “Comparative benchmarking of matrix multiplication on a multicore coprocessor and a GPU,” Computational Electromagnetics Workshop (CEM’15), İzmir, Turkey, July 2015.
  • M. Hidayetoğlu and L. Gürel, “Full-Wave and Approximate Solutions of Large Electromagnetic Scattering Problems,” 2015 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, Vancouver, Canada, July 2015.
  • L. Gürel, “Reduced-complexity solvers for extremely large problems in computational electromagnetics: a personal perspective,” 9th LEMA-EPFL Workshop on Integral Techniques for Electromagnetics (INTELECT 2015), Cappadocia, Turkey, Sept. 2015.

Invited Lectures

  • “Solution of Extremely Large Integral Equations in Computational Electromagnetics with Fast Algorithms and Parallel Computing,” Keynote Speech, 15th Mediterranean Microwave Symposium (MMS 2015), Lecce, Italy, Dec. 2015.
  • “Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures,” University of Manitoba, Winnipeg, Canada, July 2015.
  • “Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures,” University of Toronto, Toronto, Canada, July 2015.
  • “Accelerating the Solution of Forward Problems Related to Inverse Problems Involving Conducting and Dielectric Objects/Regions,” Schlumberger-Doll Research Center, Cambridge, Massachussetts, USA, June 2015.
  • “Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics,” Polytechnic University of Catalonia (UPC), Barcelona, Spain, May 2015.
  • “Integral Equations, Fast Algorithms, and Parallelization Strategies for the Solution of Extremely Large Problems in Computational Electromagnetics,” Invited Instructor (Sole Instructor), 2015 URSI Commission B School for Young Scientists, Gran Canaria, Spain, May 2015.
  • Novel and Effective Preconditioners for Iterative Solvers, Northeastern University, Boston, Massachussetts, USA, Dec. 2014.
  • A Class of Algebraic and Kernel-Dependent Fast Solvers for Integral Equations in Computational Electromagnetics, CSE Distinguished Seminar Speaker, Computational Science and Engineering, University of Ilinois at Urbana-Champaign, Illinois, USA, Dec. 2014.
  • Accurate Solutions of Extremely Large Integral-Equation Problems Involving Complex Metamaterial Structures, Department of Electrical and Computer Engineering, University of Ilinois at Urbana-Champaign, Illinois, USA, Dec. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, University of Massachusetts Lowell, Massachussetts, USA, Nov. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, Tel Aviv University, Israel, Nov. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, Council for Scientific and Industrial Research (CSIR), Pretoria, South Africa, Oct. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, Centre for High Performance Computing, University of Cape Town (UCT), Cape Town, South Africa, Oct. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, Stellenbosch University (SUN), Stellenbosch, South Africa, Oct. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, Georgia Institute of Technology, Atlanta, Georgia, USA, July 2014.
  • Novel and Effective Preconditioners for Iterative Solvers, University of Maryland, College Park, Maryland, USA, July 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, IEEE Baltimore AP/MTT Chapter, Baltimore, Maryland, USA, July 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, New Jersey Institute of Technology, Newark, New Jersey, USA, June 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, IEEE New Jersey Coast EMC/VT/AP Chapter, Middletown, New Jersey, USA, June 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, IEEE AP Long Island Chapter, New York, USA, June 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, Massachussetts Institute of Technology, Cambridge, Massachussetts, USA, Apr. 2014.
  • (Multilevel) Fast Multipole Method, Schlumberger-Doll Research Center, Cambridge, Massachussetts, USA, Feb. 2014.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Real-Life Problems in Electromagnetics, ECE Colloquium, Department of Electrical and Computer Engineering, University of Ilinois at Urbana-Champaign, Illinois, USA, Jan. 2014.
  • A Class of Algebraic and Kernel-Dependent Fast Solvers for Integral Equations in Computational Electromagnetics, Schlumberger-Doll Research Center, Cambridge, Massachussetts, USA, Dec. 2013.
  • Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures, Electroscience Laboratory, Ohio State University, Columbus, Ohio, USA, Dec. 2013.
  • Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures, MIT Lincoln Laboratory, Boston, Massachusetts, USA, Dec. 2013.
  • Fast Algorithms and Parallel Computing for the Solution of Extremely Large Integral Equations in Computational Electromagnetics, Wright State University, Dayton, Ohio, USA, Dec. 2013.
  • Fast Algorithms and Parallel Computing: Solution of Extremely Large Integral Equations in Computational Electromagnetics, University of Illinois at Chicago, Chicago, USA, Sept. 2013.
  • Fast Algorithms and Parallel Computing for the Solution of Extremely Large Integral Equations in Computational Electromagnetics, Marquette University, Milwaukee, Wisconsin, USA, Sept. 2013.
  • Parallel-MLFMA Solutions of Large-Scale Problems Involving Dielectric and Composite Metamaterial Structures, University of Illinois at Urbana-Champaign, Illinois, USA, Sept. 2013.
  • Recursive Algorithms: Early Years of Developing Fast Solvers with Prof. Chew at the UIUC Electromagnetics Laboratory, 2013 Workshop on Electromagnetic Theory, Modeling and Simulation, University of Electronic Science and Technology of China (UESTC), Chengdu, China, June 2013.
  • Parallel-MLFMA Solutions of Very Large Benchmark Problems in Computational Electromagnetics, 2013 Workshop on Electromagnetic Theory, Modeling and Simulation, University of Electronic Science and Technology of China (UESTC), Chengdu, China, June 2013.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics with Fast Algorithms and Parallel Computing, South China University of Technology (SCUT), Guangzhou, China, June 2013.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics with Fast Algorithms and Parallel Computing, IEEE Santa Clara Section, Santa Clara County, California, USA, March 2013.
  • World Records @ Bilkent: Parallel Computing and Fast Algorithms for the Solution of World’s Largest Integral Equations in Computational Electromagnetics, Bilkent University, Ankara, Turkey, Feb. 2013.
  • Accuracy Considerations for the Integral-Equation Solutions of Some Canonical Problems, Laboratory of Electromagnetics and Acoustics (LEMA), Ecole Polytechnique Federale de Lausanne, Sevilla, Spain, Oct. 2012.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics, University of Manitoba, Winnipeg, Canada, July 2012.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics, Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA, July 2012.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics, Marquette University, Milwaukee, Wisconsin, USA, July 2012.
  • Novel and Effective Preconditioners for Iterative Solvers, Beijing Institute of Technology, Beijing, China, June 2012.
  • Parallel Computing of CEM Methods, Computational Electromagnetics Summer School at the University of Electronic Science and Technology of China, Chengdu, China, June 2012.
  • Fast Computational Electromagnetics Algorithms, Computational Electromagnetics Summer School at the University of Electronic Science and Technology of China, Chengdu, China, June 2012.
  • Solution of Extremely Large Integral-Equations in Computational Electromagnetics, Fudan University, Shanghai, China, June 2012.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics, Indian Institute of Technology (IIT), New Delhi, India, May 2012.
  • Novel and Effective Preconditioners for Iterative Solvers, Indian Institute of Technology (IIT), New Delhi, India, May 2012.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics, Gdansk University of Technology, Gdansk, Poland, May 2012.
  • Solution of Extremely Large Integral Equations in Computational Electromagnetics, MIT Lincoln Laboratory, Boston, Massachusetts, USA, April 2012.
  • Novel and Effective Preconditioners for Iterative and Parallel MLFMA Solvers, ElectroScience Laboratory, Ohio State University, Ohio, USA, April 2012.
  • Novel and Effective Preconditioners for Iterative and Parallel MLFMA Solvers, University of Illinois at Urbana-Champaign, Illinois, USA, April 2012.
  • Parallel Computing Records @ Bilkent: World’s Largest Integral Equations Solved in Computational Electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Feb. 2012.
  • Fast Algorithms and Parallel Computing for the Solution of Extremely Large Integral Equations in Computational Electromagnetics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Nov. 2011.
  • Parallel Computing and Fast Algorithms: Solving the World’s Largest Integral Equations in Computational Electromagnetics, TOBB University of Economics and Technology, Ankara, Turkey, Oct. 2011.
  • World Records @ Bilkent: Parallel Computing and Fast Algorithms for the Solution of World’s Largest Integral Equations in Computational Electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Oct. 2011.
  • Computational Electromagnetics and Parallel Computing: Solutions of Extremely Large Integral Equations and Their Applications, University of Michigan, Ann Arbor, Michigan, USA, Sept. 2011.
  • A Review of Novel and Effective Preconditioners for Iterative and Parallel MLFMA Solvers, Schlumberger-Doll Research Center, Cambridge, Massachussetts, USA, Aug. 2011.
  • Solutions of Extremely Large Integral Equations and Their Applications: Computational Electromagnetics and Parallel Computing, Syracuse University, Syracuse, USA, July 2011.
  • Emphasizing the Accuracy and Efficiency Aspects of Solutions of Extremely Large Benchmark Problems in Computational Electromagnetics, Workshop on Advanced Techniques in Computational Electromagnetics (AT-CEM’11), Glasgow, Scotland, UK, June 2011.
  • A Review of Novel and Effective Preconditioners for Iterative and Parallel MLFMA Solvers, Area of Excellence on Theory, Modeling, and Simulation of Emerging Electronics, The University of Hong Kong, Hong Kong, China, Apr. 2011.
  • Computational Electromagnetics and Parallel Computing: Solutions of Extremely Large Integral Equations and Their Applications, Schlumberger-Doll Research Center, Cambridge, Massachussetts, USA, Apr. 2011.
  • What is Computational Electromagnetics??, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Mar. 2011.
  • Solutions of Extremely Large Integral-Equation Problems Involving Hundreds of Millions of Unknowns and Their Applications in Computational Electromagnetics, Plenary Talk, The 27th International Review of Progress in Applied Computational Electromagnetics (ACES 2011), Williamsburg, Virginia, Mar. 2011.
  • Parallel Computing for the Solution of World’s Largest Matrix Equations in Computational Electromagnetics, Department of Computer Engineering, Bilkent University, Ankara, Turkey, Mar. 2011.
  • Parallel Computing for the Solution of World’s Largest Matrix Equations in Computational Electromagnetics, Department of Computer Engineering, METU, Ankara, Turkey, Mar. 2011.
  • Solutions of the World’s Largest Physical Problems in Computational Electromagnetics with Parallel Computing and Fast Algorithms, Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey, Nov. 2010.
  • Breaking World Records @ Bilkent: Solving Hundreds of Millions of Unknowns in Computational Electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Oct. 2010.
  • A World Record in Turkey: Computational Electromagnetics, Europe Science and Fun Day (organized by TUBITAK), Bilkent University, Ankara, Turkey, Sept. 2010.
  • Computational Electromagnetics and Parallel Computing: Extremely Large Integral-Equation Solutions and Applications, Ginzton Laboratory, Stanford University, California, USA, June 2010.
  • Efficient parallelization of the multilevel fast multipole algorithm for the solution of hundreds of millions of unknowns in computational electromagnetics, VII Iberian Meeting on Computational Electromagnetics (EIEC), Monfragüe, Cáceres, Spain, May 2010.
  • Continuing the Series of World Records @ Bilkent: Solving Hundreds of Millions of Unknowns in Computational Electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Feb. 2010.
  • Breaking World Records @ Bilkent: Solving Hundreds of Millions of Unknowns in Computational Electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Dec. 2009.
  • Solution of the World’s Largest Dense-Matrix Electromagnetics Problems with Parallel Computing and Fast Algorithms, BAŞARIM’09 High Performance and Grid Computing Conference, Middle East Technical University, Ankara, Turkey, Apr. 2009.
  • Computational Electromagnetics: What Does It Mean to Break the World Record in Bilkent, Bilkent University Library, Ankara, Turkey, Feb. 2009.
  • World Record in Computational Electromagnetics: Solution of Equations Involving Hundreds of Millions of Unknowns, Yıldız Technical University, Istanbul, Turkey, Feb. 2009.
  • Breaking the World Record @ Bilkent: Solving Tens of Millions of Unknowns in Computational Electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Feb. 2009.
  • Computational Electromagnetics: Solving the World’s Largest Integral-Equation Problems with Hundreds of Millions of Unknowns, Faculty of Science, Bilkent University, Ankara, Turkey, Dec. 2008.
  • Parallel Computing and Fast Algorithms for the Solution the World’s Largest Dense-Matrix Problems in Computational Electromagnetics, High Performance Computing Galician Network, The Supercomputing Center of Galicia (CESGA), Santiago de Compostela, Spain, Sept. 2008.
  • Parallel MLFMA for the Solution of the World’s Largest Integral-Equation Problems in Computational Electromagnetics: Towards 100 Million Unknowns, Faculty of Engineering Distinguished Lecture, The University of Hong Kong, Hong Kong, China, May 2008.
  • Towards 100 Million Unknowns: Solving the World’s Largest Dense-Matrix Problems in Computational Electromagnetics with Parallel Computing, Department of Industrial Engineering, METU, Ankara, Turkey, May 2008.
  • Breaking the World Record in Computational Electromagnetics: Solving Tens of Millions of Unknowns with Parallel Computing, Department of Electrical and Electronics Engineering, METU, Ankara, Turkey, Mar. 2008.
  • Breaking the World Record in Computational Electromagnetics: Solving Tens of Millions of Unknowns with Parallel Computing, IBM Thomas J. Watson Research Center, Yorktown Heights, New York, USA, Dec. 2007.
  • MLFMA Solution of Large Problems of Computational Electromagnetics, Helsinki University of Technology, Helsinki, Finland, Apr. 2006.
  • Solution of Large Problems in Computational Electromagnetics, Nokia Research Center, Helsinki, Finland, Apr. 2006
  • Solution of Large Problems in Computational Electromagnetics, ONERA, Paris, France, Apr. 2005.
  • Accurate Solution of Large Computational Electromagnetics Problems, Auburn University, Alabama, USA, Mar. 2005.
  • Essays on the Iterative Solution of the Combined-Field Integral Equation, University of Illinois at Urbana-Champaign, Illinois, USA, Feb. 2005.
  • Solution of Large Problems in Computational Electromagnetics, IBM Thomas J. Watson Research Center, Yorktown Heights, New York, USA, Jan. 2005.
  • Improving the Accuracy of the Magnetic-Field Integral Equation (MFIE), University of Illinois at Urbana-Champaign, Illinois, USA, May 2004.
  • Electromagnetic Compatibility, Department of Electrical and Electronics Engineering, Hacettepe University, Ankara, Turkey, Mar. 1995.
  • Recursive T-matrix algorithms for electromagnetic scattering problems, IEEE North Jersey Section, Microwave Theory and Techniques Society Chapter, Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, Feb. 1994
  • Fast algorithm for electromagnetic solution of modified-geometry problems, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Sept. 1993.
  • Fast recursive algorithms in electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, Nov. 1992.
  • Recursive algorithms for computational electromagnetics, Electromagnetics Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Illinois, USA, Apr. 1991.
  • Recursive algorithms for computational electromagnetics, IBM Thomas J. Watson Research Center, Yorktown Heights, New York, USA, Dec. 1990.
  • Recursive algorithms for computational electromagnetics, Schlumberger-Doll Research, Ridgefield, Connecticut, USA, Nov. 1990.
  • Recursive algorithms for computational electromagnetics, Department of Electrical and Electronics Engineering, Bilkent University, Ankara, June 1990.
  • Electromagnetic characterization of strip and patch geometries using reflection operators, IBM Zurich Research Center, Zurich, Switzerland, Aug. 1989.

Journal Editorships

  • 2014 – present, Associate Editor, ACES Express, Applied Computational Electromagnetics Society (ACES)
  • 2014 – present, Associate Editor, IET Microwaves, Antennas & Propagation
  • 2013 – 2014, Associate Editor, ACES Journal, Applied Computational Electromagnetics Society (ACES)
  • 2011, Guest Editor, Special Issue, ACES Journal
  • 2008 – present, Associate Editor, Progress In Electromagnetics Research (PIER)
  • 2008 – present, Associate Editor, Journal of Electromagnetic Waves and Applications (JEMWA)
  • 2007 – 2013, Associate Editor, IEEE Antennas and Wireless Propagation Letters, IEEE
  • 2003 – 2015, Associate Editor, Radio Science, American Geophysical Union (AGU)

Other Scholarly Activities

  • 2016, Member, Technical Program Committee, IEEE International Conference on Computational Electromagnetics (ICCEM), Guangzhou, China
  • 2015, Keynote Speaker, 15th Mediterranean Microwave Symposium (MMS 2015), Lecce, Italy
  • 2015, Technical Program Subcommittee Co-Chair, PIERS 2015 Progress in Electromagnetics Research Symposium, Prague, Czech Republic
  • 2015, Sole Instructor, 2015 URSI Commission B School for Young Scientists, Gran Canaria, Spain
  • 2015, Member, Technical Program Committee, IEEE International Conference on Computational Electromagnetics (ICCEM), Hong Kong
  • 2014, TEDx Speaker, Ankara, Turkey
  • 2014, Organizer, Special Session on "Algebraic and Kernel-Dependent Solvers for Integral Equations," 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA
  • 2014, Organizer, Special Session on "Multi-Scale and Multi-Physics Solvers," 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Memphis, TN, USA
  • 2012 – present, Member, Board of Trustees, Izmir University of Economics, Izmir, Turkey
  • 2012, Invited Keynote Speaker, 12th Mediterranean Microwave Symposium (MMS 2012), Istanbul, Turkey
  • 2012, Invited Keynote Speaker, 6th URSI-Turkey National Assembly and Congress, Istanbul, Turkey
  • 2012, Member, Technical Program Committee, 2012 IEEE International Conference on Ultra-Wideband, Syracuse, New York, USA
  • 2012, Member, International Advisory Committee, PIERS 2012 Progress in Electromagnetics Research Symposium, Moscow, Russia
  • 2011 – present, Fellow, Applied Computational Electromagnetics Society (ACES)
  • 2011, Guest Editor, Special Issue, Applied Computational Electromagnetics Society (ACES) Journal
  • 2011 – 2013, Member, Board of Directors, Applied Computational Electromagnetics Society (ACES)
  • 2011 – 2013, Distinguished Lecturer, IEEE Antennas and Propagation Society
  • 2011, Member, Scientific Committee, ICEAA’11 International Conference on Electromagnetics in Advanced Applications and IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, Torino, Italy
  • 2011, Plenary Speaker, Applied Computational Electromagnetics Society Conference (ACES 2011), Williamsburg, Virginia
  • 2011, Convener, Special Session on "EM Modelling for EMC," URSI General Assembly and Scientific Symposium, Istanbul, Turkey
  • 2011, Member, Scientific Program Committee, URSI General Assembly and Scientific Symposium, Istanbul, Turkey
  • 2011, Reviewer, 2011 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Spokane, Washington, USA
  • 2010 – present, Member, Awards Committee of the IEEE Antennas and Propagation Society
  • 2010, Member, Scientific Committee, VII Iberian Meeting on Computational Electromagnetics (EIEC), Monfragüe, Cáceres, Spain
  • 2010, Special Session Organizer, "Recent Advances in Integral Equations and Fast Methods," Applied Computational Electromagnetics Society Conference (ACES 2010), Tampere, Finland
  • 2010, Convener, Special Session on "Numerical Methods in Scattering," 2010 URSI Commission B International Symposium on Electromagnetic Theory, Berlin, Germany
  • 2010, Member, International Advisory Committee, PIERS 2010 Progress in Electromagnetics Research Symposium, Cambridge, MA, USA
  • 2010, Member, Program Committee, BAŞARIM’10 High Performance and Grid Computing Conference, Istanbul Technical University, Istanbul, Turkey
  • 2010, Member, International Program Committee, IASTED International Conference on Antennas, Radar and Wave Propagation (ARP 2010), Cambridge, MA, USA
  • 2010, Member, International Advisory Committee, PIERS 2010, Xi’an, China
  • 2010, Reviewer, 2010 IEEE International Symposium on Antennas and Propagation and CNC/USNC/URSI Radio Science Meeting, Toronto, Ontario, Canada
  • 2009 – present, Member, Graduate Studies Committee, Dept. of Electrical and Electronics Eng., Bilkent University
  • 2009 – present, Fellow, The Institute of Electrical and Electronics Engineers (IEEE)
  • 2009, Reviewer, Student Paper Competition, 2009 IEEE International Symposium on Antennas and Propagation and 2009 USNC/URSI National Radio Science Meeting
  • 2009, Member, Textbook Award Committee, Turkish Academy of Sciences (TUBA)
  • 2009, Member, Scientific Committee, ICEAA’09 International Conference on Electromagnetics in Advanced Applications, Torino, Italy
  • 2009, Member, Evaluation Committee, I. National High Performance and Grid Conference, Ankara, Turkey
  • 2009, Member, International Advisory Committee, PIERS 2009, Beijing, China
  • 2008 – present, Member, URSI Commission B Technical Advisory Board
  • 2008, Member, Textbook Award Committee, Turkish Academy of Sciences (TUBA)
  • 2008 – 2009, Member, ABET Committee, Dept. of Electrical and Electronics Engineering, Bilkent University
  • 2008, Member, Advisory Committee for SynergyTurk, Undersecretariat for Defence Industries (SSM), Ankara, Turkey
  • 2008, Member, International Advisory Committee, PIERS 2008 in Cambridge, MA, USA
  • 2008 – 2009, Chair, European Union FP7 REGPOT Project Committee for National Nanotechnology Research Center (UNAM), Bilkent University
  • 2008, Supercomputing: constructed a 136-core parallel cluster with state-of-the-art quad-core processors and 544 GB of memory at BiLCEM, Bilkent University
  • 2008, Member, Technical Program Committee, PIERS 2008 in Hangzhou, China
  • 2008, Member, Technical Committee, EWS’2008 Vth International Workshop on Electromagnetic Wave Scattering, Antalya, Turkey
  • 2007 – present, Fellow, The Electromagnetics Academy
  • 2007, Session Organizer, PIERS 2007 in Beijing, China
  • 2007, Editor, Proceedings of CEM’07 International Workshop on Computational Electromagnetics
  • 2007 – present, Member, Transnational Committee of the IEEE Antennas and Propagation Society
  • 2007, Member, Technical Program Committee, PIERS 2007 in Prague, Czech Republic
  • 2007, Supercomputing: constructed a 64-core parallel cluster with state-of-the-art quad-core processors and 256 GB of memory at BiLCEM, Bilkent University
  • 2007, Member, Technical Program Committee, NATO RTO SET-121 Specialists’ Meeting on "Multi-Band Radar for Air Defence," La Spezia, Italy
  • 2007, Member, International Technical Programme Committee, 7th Mediterranean Microwave Symposium (MMS 2007), Budapest, Hungary
  • 2006, “Opponent” at the public examination of Dr. Matti Taskinen’s doctoral dissertation, Helsinki University of Technology, Finland
  • 2006 – present, Member, Advisory Committee, National Meteorology Institute (UME), Turkey
  • 2006 – 2008, Member, General Assembly of the European Microwave Association (EuMA)
  • 2006, Member, Technical Committee, 6th Mediterranean Microwave Symposium (MMS 2006), Genova, Italy
  • 2005, Founder, Bilkent University Computational Electromagnetics Research Center (BiLCEM)
  • 2005 – present, Member, Society for Industrial and Applied Mathematics (SIAM)
  • 2005 – present, Member, SIAM Activity Group on Computational Science and Engineering (CS&E)
  • 2005, Member, Technical Committee, 5th Mediterranean Microwave Symposium (MMS 2005), Athens, Greece
  • 2005, Member, EUR-ACE Department Committee for the Evaluation of MS Theses, Bilkent University
  • 2004, Member, Review Board, 4th Mediterranean Microwave Symposium (MMS 2004), Marseille, France
  • 2003, Session Organizer, PIERS 2003 in Hawaii, USA
  • 2003 – present, Member, USNC, International Union of Radio Science (URSI)
  • 2002 – 2007, Member, The Electromagnetics Academy
  • 2001 – 2003, Member, IEEE Turkey Section ADCOM
  • 2000, Founder, IEEE EMC Turkey Chapter
  • 1997 – 2008, Senior Member, The Institute of Electrical and Electronics Engineers (IEEE)
  • 1992 – 1997, Member, The Institute of Electrical and Electronics Engineers (IEEE)
  • 1992 – 2011, Member, Applied Computational Electromagnetics Society (ACES)
  • 1987 – 1991, Student Member, The Institute of Electrical and Electronics Engineers (IEEE)

Conferences Organized or Chaired

  • 2015, General Chairman, CEM’15 International Workshop on Computational Electromagnetics
  • 2013, General Chairman, CEM’13 International Workshop on Computational Electromagnetics
  • 2011, General Chairman, CEM’11 International Workshop on Computational Electromagnetics
  • 2011, Co-Chair, Industry Liaisons, The 2011 High Performance Computing & Simulation Conference (HPCS 2011), Istanbul, Turkey
  • 2009, General Chairman, CEM’09 International Workshop on Computational Electromagnetics
  • 2007, General Chairman, CEM’07 International Workshop on Computational Electromagnetics
  • 2006 – present, Chair, Commission E: Electromagnetic Noise and Interference, URSI Turkey National Committee
  • 2003 – 2004, Chair, Faculty Search Committee, Dept. of Electrical and Electronics Eng., Bilkent University
  • 2003, Cochairman, 2003 IEEE International Symposium on Electromagnetic Compatibility
  • 2000 – 2003, Chairman, IEEE AP/MTT/ED/EMC Turkey Chapter

Honors

  • IEEE Harrington-Mittra Award in Computational Electromagnetics (2015)
  • ECE Distinguished Alumni, University of Illinois, Urbana-Champaign (2013)
  • Distinguished Lecturer, IEEE Antennas and Propagation Society (2011 – 2014)
  • Fellow, Applied Computational Electromagnetics Society (ACES) (2011)
  • White Thought, Awarded for Excellence in Academia, Bornova Anadolu Lisesi Education Foundation (BALEV) (2010)
  • Fellow, The Institute of Electrical and Electronics Engineers (IEEE) (2009)
  • Fellow, The Electromagnetics Academy (2007)
  • Science Scholarship, Turkish Academy of Sciences (TUBA) (2002 – 2005)
  • Young Scientist Award, Scientific and Technical Research Council of Turkey (TUBITAK) (2003)
  • Certificate of Appreciation, IEEE Microwave Theory and Techniques Society (2002)
  • Volunteer Award, Region 8, The Institute of Electrical and Electronics Engineers (IEEE) (2001)
  • Associate Professor, title awarded by the Institute of Higher Education, Ankara, Turkey (1993)
  • Fellowship, Turkish Education Foundation, Istanbul, Turkey (1986 – 1987)
  • Fellowship, Scientific and Technical Research Council of Turkey (TUBITAK) (1982 – 1986)
  • High Honor Certificates, Middle East Technical University, Ankara, Turkey (7 semesters) (1982 – 1986)
  • Honor Certificate, Middle East Technical University, Ankara, Turkey (1 semester) (1985)
  • 18. Place, Nationwide University Entrance Examination, Turkey (1982)
  • Highest Score, Chemistry Contest, Scientific and Technical Research Council of Turkey (1982)
  • Fellowship, Scientific and Technical Research Council of Turkey (TUBITAK) (1979 – 1982)