Hüseyin Arda Ülkü

Title:

Prof. Dr.

Department:

Electrical & Electronics Engineering Department

Position:

Chair

Email:

huseyinarda.ulku@yeditepe.edu.tr

Telephone:

0 216 578 17 41

Office:

A-605

Time:

Full Time

Akademik

Resume

YOK Academic

Research Interests:

Numerical solutions of electromagnetic and acoustic problems in time and frequency domains
Radar cross section analysis
Integral equations (Method of moments, marching on-in-time method)
Asymptotic techniques (Physical optics, Kirchhoff approximations, equivalent edge currents)
Inverse problems and microwave imaging methods (Born based methods, contrast source inversion method)

Biography:

B.Sc.: Electronics Engineering, Gebze Institute of Technology, 2006.
M.Sc.: Electronics Engineering, Gebze Institute of Technology, 2008.
Ph.D.: Electronics Engineering, Gebze Institute of Technology, 2011.

Projects:

TUBITAK, Researcher, “Double Green functions method for an inverse source problem related to hemisphere,” 2016 - 2017.
TUBITAK, Principal Investigator, "Conforming combination of electric and magnetic field integral equations and efficient solution of combined field integral equation by method of moments," 2017 - 2018.

Courses Given

Circuits and Systems

Antennas and Propagation

Publications

BOOK CHAPTERS

S. Bin Sayed, R. Chen, H. A. Ülkü, and H. Bağcı, “Explicit marching-on-in-time solvers for second-kind time domain integral equations,” in Advances in Time–Domain Computational Electromagnetic Methods, edited by Q. Ren, S. Yan, and A. Elsherbeni, Wiley-IEEE Press Series on Electromagnetic Wave Theory, 2023.
S. Bin Sayed, I. E. Uysal, H. A. Ülkü, and H. Bağcı, “New trends in time-domain methods for plasmonic media,” in New Trends in Computational Electromagnetics, edited by Ö. Ergül, SciTech Publishing (The Institution of Engineering and Technology), London, UK, 2019.

JOURNAL PAPERS

I. Sisman, T. Haykir Ergin, D. Erol Barkana, and H. A. Ülkü, “Design and realization of an X band monopulse feed antenna for low earth orbit (LEO) satellite ground station,” International Journal of Antennas and Propagation, vol. 2024, article id 6659390, 2024.
A. Aktepe and H. A. Ülkü, “Evaluation of the retarded-time potentials due to an impulsively excited curvilinear RWG function,” IEEE Trans. Antennas Propag., vol. 71, no. 12, pp. 9268 – 9276, Dec. 2023.
S. Bin Sayed, R. Chen, H. A. Ülkü, and H. Bağcı, “A time domain volume integral equation solver to analyze electromagnetic scattering from nonlinear dielectric objects,” IEEE Trans. Antennas Propag., vol. 71, no. 12, pp. 9255 – 9267, Dec. 2023.
A. Aktepe and H. A. Ülkü, “Exact evaluation of time domain physical optics integral for high order triangles,” IEEE Trans. Antennas Propag., vol. 71, no. 1, pp. 1170 – 1173, Jan. 2023.
R. Chen, H. A. Ülkü, F. Andriulli, and H. Bağcı, “On the low-frequency behavior of vector potential integral equations for perfect electrically conducting scatterers,” IEEE Trans. Antennas Propag., vol. 70, no. 12, pp. 12411 – 12416, Dec. 2022.
A. Aktepe, A. A. Ergin, and H. A. Ülkü, “On the evaluation of the Kirchhoff approximation integral using Radon transform interpretation in time domain,” Turkish Journal of Engineering Research and Education, vol. 1, no. 2, pp. 86 – 91, Nov. 2022 (in Turkish).
A. Aktepe and H. A. Ülkü, “On the closed-form evaluation of the PO integral using the Radon transform interpretation for linear triangles,” Turk. J. Electr. Eng. Co., vol. 29, no. 5, pp. 2520-2528, Oct. 2021.
R. Chen, S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “An explicit time marching scheme for efficient solution of the magnetic field integral equation at low frequencies,” IEEE Trans. Antennas Propag., vol. 69, no. 2, pp. 1213 – 1218, Feb. 2021.
A. Aktepe, H. A. Serim, and H. A. Ülkü, “Transient analysis of scattering from impedance surfaces using physical optics approximation,” IET Microwaves, Antennas Propag., vol. 14, no. 15, pp. 2020 – 2026, Dec. 2020.
A. Aktepe and H. A. Ülkü, “Exact evaluation of time domain physical optics integral on quadratic triangular surfaces,” IEEE Trans. Antennas Propag., vol. 68, no. 3, pp. 7447 – 7456, Nov. 2020.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Explicit time marching schemes for solving the magnetic field volume integral equation,” IEEE Trans. Antennas Propag., vol. 68, no. 3, pp. 2224 – 2237, Mar. 2020.
H. A. Serim, H. A. Ülkü, S. Barak, and A. Alkumru, “On the reflection and shadow boundaries for a moving line source illumination,” Electromagnetics, vol. 38, no. 7, pp. 448-457, 2018.
H. A. Ülkü, “Temporal preconditioners for marching on-in-time based time domain integral,” Turk. J. Electr. Eng. Co., vol. 25, no. 4, pp. 2933-2942, Aug. 2017.
H. A. Ülkü, I. Bogaert, K. Cools, F. P. Andriulli, and H. Bağcı, “Mixed discretization of the time domain MFIE at low frequencies,” IEEE Antennas Wireless Propag. Lett., vol. 16, pp. 1565 – 1568, 2017.
I. E. Uysal, H. A. Ülkü, M. Sajjad, N. Singh, U. Schwingenschlogl, and H. Bağcı, “Quantum-corrected transient analysis of plasmonic nanostructures,” Optics Express, vol. 25, no. 6, pp. 5891-5908, Mar. 2017.
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions on plasmonic nanostructures using a surface integral equation solver,” J. Opt. Soc. Am. A, vol. 33, no. 9, pp. 1747-1759, Sep. 2016.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “A stable marching on-in-time scheme for solving the time domain electric field volume integral equation on high-contrast scatterers,” IEEE Trans. Antennas Propag., vol. 63, no. 7, pp. 3098 – 3110, July 2015.
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “MOT solution of the PMCHWT equation for analyzing transient scattering from conductive dielectrics,” IEEE Antennas Wireless Propag. Lett., vol. 14, pp. 507 – 510, 2015.
H. A. Ülkü, H. Bağcı, and E. Michielssen, “Marching on-in-time solution of the time domain magnetic field integral equation using a predictor-corrector scheme,” IEEE Trans. Antennas Propag., vol. 61, no. 8, pp. 4120 – 4131, Aug. 2013.
H. A. Ülkü and A. A. Ergin, “Application of analytical retarded-time potential expressions to the solution of time domain integral equations,” IEEE Trans. Antennas Propag., vol. 59, no. 11, pp. 4123 – 4131, Nov. 2011.
H. A. Ülkü, A. A. Ergin, and F. Dikmen, “On the evaluation of retarded-time potentials for SWG bases,” IEEE Antennas Wireless Propag. Lett., vol. 10, pp. 187 – 190, 2011.
H. A. Ülkü and A. A. Ergin, “On the singularity of the closed-form expression of the magnetic field in time domain,” IEEE Trans. Antennas Propag., vol. 59, no. 2, pp. 691 – 694, Feb. 2011.
H. A. Ülkü and A. A. Ergin, “Analytical evaluation of transient magnetic fields due to RWG current bases,” IEEE Trans. Antennas Propag., vol. 55, no. 12, pp. 3565 – 3575, Dec. 2007.

CONFERENCE PAPERS

M. Korkut, T. Haykir-Ergin, I. Sisman, and H. A. Ülkü “Design of an ultra low-power tunable ring VCO in 65 nm CMOS technology for 2.9-4.5 GHz frequency,” Fourth International Conference on Electrical, Communication and Computer Engineering (ICECCE), Dubai, UAE, Dec. 30-31, 2023.
A. Aktepe and H. A. Ülkü, “On the evaluation of retarded-time potentials due to CRWG functions: self-term case,” International Conference on Electromagnetics in Advanced Applications (ICEAA), Venice, Italy, Oct. 9-13, 2023.
S. Dinleyen and H. A. Ülkü, “Hybridized contrast source inversion method,” 34th International Union of Radio Science General Assembly and Scientific Symposium, Rome Italy (hybrid), Aug. 28-Sep. 4, 2021 (URSI Young Scientist Award ).
A. Aktepe and H. A. Ülkü, “Time domain physical optics integral evaluation on third order triangles,” 33rd International Union of Radio Science General Assembly and Scientific Symposium, Rome Italy (online due to covid-19), Aug. 29-Sep. 30, 2020 (URSI Young Scientist Award ).
A. Aktepe and H. A. Ülkü, “Evaluation of PO and EEC radiation integrals on quadratic triangles and edges in time domain,” The 5th International EMC Conference (EMC Türkiye 2019), Kocaeli, Turkey, Sep. 22-25, 2019.
A. F. Yılmaz and H. A. Ülkü, “Comparison of mixed discretization schemes for combined field integral equation,” The 5th International EMC Conference (EMC Türkiye 2019), Kocaeli, Turkey, Sep. 22-25, 2019.
S. Dinleyen and H. A. Ülkü, “Comparison of contrast source inversion based methods for solving two dimensional electromagnetic inverse scattering problems,” The 5th International EMC Conference (EMC Türkiye 2019), Kocaeli, Turkey, Sep. 22-25, 2019.
S. Yıkılmazçınar, E. Başaran, and H. A. Ülkü, “Single fed UWB Sierpinski fractal monopole antenna array,” The 5th International EMC Conference (EMC Türkiye 2019), Kocaeli, Turkey, Sep. 22-25, 2019.
S. Dinleyen and H. A. Ülkü, “Comparison of CSIM and MR-CSIM methods for two- dimensional inverse scattering problems,” International Symposium on Engineering Natural Sciences and Architecture, Izmit, Turkey, May 02-04, 2019 (in Turkish).
A. F. Yilmaz and H. A. Ülkü, “Range space projected combined field integral equation,” International Symposium on Engineering Natural Sciences and Architecture, Izmit, Turkey, May 02-04, 2019 (in Turkish).
A. Aktepe and H. A. Ülkü, “Evaluation of the contour integral on curved edges in time domain equivalent edge currents,” Applied Computational Electromagnetics Society Symposium, Miami, Florida, USA, Apr. 14-18, 2019.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions in magnetized plasma using volume integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Boston, Massachusetts, USA, July 8-13, 2018.
I. E. Uysal, S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Electron energy loss spectroscopy simulation for plasmonic nanoparticles using a time domain surface integral equation solver,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, , Boston, Massachusetts, USA, July 8-13, 2018.
A. Aktepe, H. A. Serim, and H. A. Ülkü, “Evaluation of time domain physical optics integral on curved surfaces,” URSI Atlantic Radio Science Conference (URSI AT-RASC), Gran Canaria, Canary Islands, Spain, May 28 - June 1, 2018.
A. F. Yilmaz and H. A. Ülkü, “On the conforming combination of the electric and magnetic field integral equations,” Applied Computational Electromagnetics Society Symposium, Denver, Colorado, USA, Mar. 25-29, 2018 (Finalist (top 10) on student paper competition).
S. Bin Sayed, I. E. Uysal, H. A. Ülkü, and H. Bağcı, “A volume integral equation solver for quantum-corrected transient analysis of scattering from plasmonic nanostructures,” Applied Computational Electromagnetics Society Symposium, Denver, Colorado, USA, Mar. 25-29, 2018 (3rd place on student paper competition).
H. A. Serim and H. A. Ülkü, “Analysis of transient scattering from impedance surfaces using physical optics approximation,” Applied Computational Electromagnetics Society Symposium, Denver, Colorado, USA, Mar. 25-29, 2018.
I. E. Uysal, H. A. Ülkü, O. Gulseren and H. Bağcı, “Scattering analysis of silver nanoparticles for solar cell applications using integral equations,” Applied Computational Electromagnetics Society Symposium, Denver, Colorado, USA, Mar. 25-29, 2018.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Electromagnetic analysis of time varying media using volume integral equations,” 32nd International Union of Radio Science General Assembly and Scientific Symposium, Montreal, Canada, Aug. 19-26, 2017.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions on magnetized ferrites using Landau-Lifshitz-Gilbert and volume integral equations,” 32nd International Union of Radio Science General Assembly and Scientific Symposium, Montreal, Canada, Aug. 19-26, 2017.
S. Bin Sayed, I. E. Uysal, H. A. Ülkü, and H. Bağcı, “Quantum-corrected transient analysis of plasmonic nanostructures using a volume integral equation solver,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 9-14, 2017.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “An explicit MOT scheme for solving the TD-EFVIE on nonlinear and dispersive scatterers,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 9-14, 2017.
A. Alkumru, H. A. Ülkü, G. Çınar, S. Vatansever, and H. Sertlek, “A novel two Green functions method for the identification of sources located in a hemisphere,” Progress in Electromagnetics Research Symposium (PIERS), St. Petersburg, Russia, May 22-25, 2017.
S. Vatansever, A. Alkumru, H. Sertlek, H. A. Ülkü, and G. Çınar, “A double Green function method for an inverse source problem related to a hemisphere,” Applied Computational Electromagnetics Society Symposium, Firenze, Italy, Mar. 26-30, 2017.
M. Akkuş, F. Dikmen, H. A. Ülkü, and A. A. Ergin, “Radon transform interpretation of retarded-time potentials for SWG bases,” Applied Computational Electromagnetics Society Symposium, Firenze, Italy, Mar. 26-30, 2017.
I. E. Uysal, H. Bağcı, A. A. Ergin, and H. A. Ülkü, “On the initial condition problem of the time domain PMCHWT surface integral equation,” Applied Computational Electromagnetics Society Symposium, Firenze, Italy, Mar. 26-30, 2017.
Y. F. Shi, I. E. Uysal, P. Li, H. A. Ülkü, and H. Bağcı, “A surface integral equation solver for transient analysis of graphene devices,” Advanced Electromagnetics Symposium (AES 2016), Torremolinos (Malaga), Spain, July 26–28, 2016.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions on ferromagnetic scatterers using Landau-Lifshitz-Gilbert and volume integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Fajardo, Puerto Rico, June 26- July 1, 2016, (Finalist on student paper competition-top 13 among 158 competitors).
Y. F. Shi, I. E. Uysal, P. Li, H. A. Ülkü, and H. Bağcı, “An MOT-TDIE solver for analyzing transient fields on graphene-based devices,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Fajardo, Puerto Rico, June 26- July 1, 2016.
A. Litvinenko, A.-L. Haji-Ali, I. E. Uysal, H. A. Ülkü, J. Oppelstrup, R. Tempone, and H. Bağcı, “Computation of fields scattered from dielectric objects of uncertain shapes using multilevel Monte Carlo,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Fajardo, Puerto Rico, June 26- July 1, 2016.
I. E. Uysal, H. A. Ülkü, M. Sajjad, N. Singh, U. Schwingenschlögl, and H. Bağcı, “DFT-corrected electromagnetic analysis of nanostructures,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Fajardo, Puerto Rico, June 26- July 1, 2016.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions on nonlinear dispersive scatterers using volume integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Fajardo, Puerto Rico, June 26- July 1, 2016.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “An explicit MOT-TD-VIE solver for time varying media,” IEEE International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES), Honolulu, Hawaii, USA, Mar. 13-17, 2016, (Finalist (top 10) on student paper competition).
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “Quantum-corrected plasmonic field analysis using a time domain PMCHWT integral equation,” IEEE International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES), Honolulu, Hawaii, USA, Mar. 13-17, 2016, (4th place on student paper competition).
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “An efficient explicit marching on in time solver for magnetic field volume integral equation,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Vancouver, British Columbia, Canada, July 19-25, 2015, (Honorable Mention Award on student paper competition).
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “Transient analysis of plasmonic nanostructures using an MOT-PMCHWT solver,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Vancouver, British Columbia, Canada, July 19-25, 2015.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions on ferrite structures using Landau-Lifshitz-Gilbert and volume integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Vancouver, British Columbia, Canada, July 19-25, 2015.
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “Analysis of transient electromagnetic interactions on nanodevices using a quantum corrected integral equation approach,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Vancouver, British Columbia, Canada, July 19-25, 2015.
Y. F. Shi, I. E. Uysal, P. Li, H. A. Ülkü, and H. Bağcı, “Analysis of transient electromagnetic wave interactions on graphene-based devices using integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Vancouver, British Columbia, Canada, July 19-25, 2015.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Recent advances in marching-on-in-time schemes for solving time domain volume integral equations,” URSI Atlantic Radio Science Conference (URSI AT-RASC), Gran Canaria, Canary Islands, May 18-22, 2015.
Y. F. Shi, I. E. Uysal, P. Li, H. A. Ülkü, and H. Bağcı, “Analysis of electromagnetic wave interactions on graphene sheets using time domain integral equations,” Applied Computational Electromagnetics Society Symposium, Williamsburg, Virginia, USA, Mar. 22-26, 2015.
H. A. Ülkü, S. Bin Sayed, and H. Bağcı, “An explicit MOT-TDVIE scheme for analyzing electromagnetic field interactions on nonlinear scatterers,” IEEE Int. Conf. Computational Electromagetics (ICCEM), Hong Kong SAR, Feb. 2-5, 2015.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Transient analysis of electromagnetic wave interactions on high-contrast scatterers using volume electric field integral equation,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Memphis, Tennessee, USA, July 6-12, 2014 (Honorable Mention Award on student paper competition).
H. A. Ülkü, S. Bin Sayed, and H. Bağcı, “Analysis of electromagnetic wave interactions on nonlinear scatterers using time domain volume integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Memphis, Tennessee, USA, July 6-12, 2014.
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “Analysis of transient plasmonic interactions using an MOT-PMCHWT integral equation solver,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Memphis, Tennessee, USA, July 6-12, 2014.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “An explicit marching on-in-time solver for time domain volume magnetic field integral equation,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Memphis, Tennessee, USA, July 6-12, 2014.
S. Bin Sayed, H. A. Ülkü, and H. Bağcı, “Stable quasi-explicit MOT solver for the time domain volume electric field integral equation,” Applied Computational Electromagnetics Society Symposium, Jacksonville, Florida, USA, Mar. 23-27, 2014 (3rd place on student paper competition).
I. E. Uysal, H. A. Ülkü, and H. Bağcı, “MOT solution of time domain PMCHWT integral equation for lossy dielectric scatterers,” Applied Computational Electromagnetics Society Symposium, Jacksonville, Florida, USA, Mar. 23-27, 2014 (5th place on student paper competition).
H. A. Ülkü and H. Bağcı, “Stability analysis of predictor-corrector based quasi-explicit MOT-TDIE solvers,” Progress in Electromagnetics Research Symposium (PIERS), Stockholm, Sweden, Aug. 12-15, 2013.
I. E. Uysal, H. A. Ülkü and H. Bağcı, “A PMCHWT surface integral equation solver for analyzing transient plasmonic interactions,” Progress in Electromagnetics Research Symposium (PIERS), Stockholm, Sweden, Aug. 12-15, 2013.
S. Bin Sayed, H. A. Ülkü and H. Bağcı, “A stable and explicit MOT solver for the time domain volume electric field integral equation,” Progress in Electromagnetics Research Symposium (PIERS), Stockholm, Sweden, Aug. 12-15, 2013.
H. A. Ülkü and A. A. Ergin, “Solution of the initial condition problem of time domain EFIE,” Computational Electromagnetics 2013 International Workshop, Izmir, Turkey, Aug. 3-5, 2013.
H. A. Ülkü, H. Bağcı, and E. Michielssen, “Explicit solution of Calderon preconditioned time domain integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Orlando, Florida, USA, July 7-12, 2013.
H. A. Ülkü and H. Bağcı, “Explicit marching on-in-time solution of the mixed-discretized time domain magnetic field integral equation at low frequencies,” Applied Computational Electromagnetics Society Symposium, Monterey, California, USA, Mar. 24-28, 2013.
H. A. Ülkü, H. Bağcı, and E. Michielssen, “Explicit solution of the time domain magnetic field integral equation using a predictor-corrector scheme,” International Conference on Electromagnetics in Advanced Applications, Cape Town, South Africa, Sept. 2-7, 2012.
H. A. Ülkü, I. Bogaert, K. Cools, F. P. Andriulli, and H. Bağcı, “On the mixed discretization of the time domain magnetic field integral equation,” International Conference on Electromagnetics in Advanced Applications, Cape Town, South Africa, Sept. 2-7, 2012.
H. A. Ülkü, I. Bogaert, K. Cools, F. P. Andriulli, and H. Bağcı, “On the low frequency behavior of the mixed discretized time domain magnetic field integral equation,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Chicago, Illinois, USA, July 8-14, 2012.
H. A. Ülkü and A. A. Ergin, “Radon transform interpretation of the physical optics integral and application to near and far field acoustic scattering problems,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, Toronto, Ontario, Canada, July 11-17, 2010.
H. A. Ülkü and A. A. Ergin, “Radon transform interpretation of physical optics integral for scalar waves: the near-near field case,” Progress in Electromagnetics Research Symposium (PIERS), Moscow, Russia, Aug. 18-21, 2009.
H. A. Ülkü, F. Dikmen, and A. A. Ergin, “Extension of exact evaluation of retarded time potentials from 2D to 3D source distributions,” Progress in Electromagnetics Research Symposium (PIERS), Moscow, Russia, Aug. 18-21, 2009.
H. A. Serim, H. A. Ülkü, H. Öztürk, S. Karaca and A. A. Ergin, “Geometric evaluation of physical optics integrals using a time-domain approach,” Vth International Workshop on Electromagnetic Wave Scattering, Antalya, Turkey, Oct. 22-25, 2008.
H. A. Serim, H. A. Ülkü, S. Karaca, H. Öztürk and A. A. Ergin, “Geometric evaluation of physical optics integrals using a time-domain approach,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 5-12, 2008.
H. A. Ülkü and A. A. Ergin, “Application of analytical expressions of transient potentials to the MOT solution of integral equations,” IEEE Int. Symp. Antennas Propag. and USNC/URSI National Radio Science Meeting, San Diego, California, USA, July 5-12, 2008.

OTHER PUBLICATIONS

A. Aktepe, D. Ozturk, and H. A. Ülkü, “NURBS kütüphanesi kullanılarak fiziksel optik integralinin zaman uzayında hesaplanması,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 1-2, 2022 (in Turkish).
S. Dinleyen, A. Karatas, O. U. Yildirim, A. Alkumru, and H. A. Ülkü, “Makine öğrenmesi aracılığıyla iki boyutlu elektromanyetik ters saçılma problemlerinin çözümü,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 1-2, 2022 (in Turkish).
F. Cugalir, H. A. Ülkü, C. S. Atesavci, and Y. Bahadirlar, “Vivaldi anten dizisinde yönlü ortak bağlaşım ve temel yön bulma algoritmalarına etkisi,” 8th International Congress on Engineering, Architecture and Design, Istanbul, Turkey, Dec. 6-7, 2021 (in Turkish).
A. Aktepe and H. A. Ülkü, “Fiziksel optik integralinin yüksek mertebeden üçgenler için zaman uzayında hesaplanması,” X. URSI-Turkish Scientific Congress National General Council Meeting, Gebze Technical University, Kocaeli, Turkey, online-live, Sep. 7-9, 2021 (in Turkish) (1st place on student paper competition).
S. Dinleyen and H. A. Ülkü, “Hibrit kontrast kaynak evirme yöntemi,” X. URSI-Turkish Scientific Congress National General Council Meeting, Gebze Technical University, Kocaeli, Turkey, online-live, Sep. 7-9, 2021 (in Turkish) (3rd place on student paper competition).
U. C. Koç, E. Başaran, H. A. Ülkü, and A. Alkumru, “Hareketli bir küreye ilişkin enerji dağılımı ve saçılma katsayısı,” X. URSI-Turkish Scientific Congress National General Council Meeting,, Gebze Technical University, Kocaeli, Turkey, online-live, Sep. 7-9, 2021 (in Turkish).
M. Akkuş, F. Dikmen, H. A. Ülkü, and A. A. Ergin, “Zaman domeninde SWG bazlarından saçılan alanların analitik hesabı,” X. URSI-Turkish Scientific Congress National General Council Meeting, Gebze Technical University, Kocaeli, Turkey, online-live, Sep. 7-9, 2021 (in Turkish) (2nd place on student paper competition).
A. Aktepe and H. A. Ülkü, “İkinci dereceden üçgenler ile modellenen saçıcıların kırınımın fiziksel teorisi ile zaman uzayında analizi,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
A. Aktepe and H. A. Ülkü, “İkinci dereceden üçgenlerle modellenen saçıcıların fiziksel optik yaklaşımı ile analizi için verimli gölgeleme yöntemi,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
A. F. Yılmaz and H. A. Ülkü, “Karma ayrıklaştırılmış birleşik alan integral denklemlerinin kıyaslanması,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
S. Dinleyen and H. A. Ülkü, “Kontrast kaynak evirme yöntemlerinin duvar ötesi görüntüleme problemlerine uygulanması,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
S. Yıkılmazçınar, E. Başaran, and H. A. Ülkü, “Tek beslemeli, ultra geniş bantlı ve yüksek verimli Sierpinski üçgen fraktal monopol anten dizisi tasarımı,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
N. Yıldırım, A. F. Yılmaz, S. Yıkılmazçınar, and H. A. Ülkü, “Geniş bantlı dairesel disk mikroşerit yama anten tasarımı,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
H. Atar, F. Erden, and H. A. Ülkü, “Bir mikroşerit antenin insan kafatasına farklı frekanslardaki etkisinin incelenmesi,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, June 17-18, 2019 (in Turkish).
S. Dinleyen and H. A. Ülkü, “Ters saçılma problemlerinin çözümünde distorted Born iteratif ve Born iteratif yöntemlerinin karşılaştırılması,” IX. URSI-Turkish Scientific Congress National General Council Meeting, KTO Karatay University, Konya, Turkey, Sep. 6-8, 2018.
A. Aktepe, H. A. Serim, and H. A. Ülkü, “Kuadratik üçgenler ile modellenen saçıcıların fiziksel optik yaklaşımı ile zaman uzayında analizi,” IX. URSI-Turkish Scientific Congress National General Council Meeting, KTO Karatay University, Konya, Turkey, Sep. 6-8, 2018, (Finalist on student paper competition).
A. Aktepe, H. A. Serim, and H. A. Ülkü, “İkinci dereceden üçgenler ile modellenen saçıcıların fiziksel optik yaklaşımı ile zaman uzayında analizi,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, May 14-16, 2018.
A. F. Yılmaz and H. A. Ülkü, “Uyumlu ayrıklaştırılmış elektrik ve manyetik alan integral denklemlerinin hedef uzayı uyumlu birleşimi,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, May 14-16, 2018.
S. Dinleyen and H. A. Ülkü, “Distorted Born iteratif yöntemi ile 2 boyutlu elektromanyetik ters saçılma problemlerinin çözümü,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, May 14-16, 2018.
S. Gedikli, A. Alkumru, and H. A. Ülkü, “Bir yarım küreye ilişkin ters kaynak problemi için çift Green fonksiyonu yöntemi,” Gebze Technical University Institute of Natural and Applied Sciences Symposium on Graduate Research, GTÜ, Kocaeli, Turkey, May 14-16, 2018.
M. Akkuş, F. Dikmen, H. A. Ülkü, and A. A. Ergin, “Radon transform interpretation of retarded-potentials for SWG basis functions,” VIII. URSI-Turkish Scientific Congress National General Council Meeting, METU, Ankara, Turkey, Sep. 1-3, 2016 (in Turkish).
H. A. Ülkü, “Temporal preconditioning of MOT based TDIE solvers,” VIII. URSI-Turkish Scientific Congress National General Council Meeting, METU, Ankara, Turkey, Sep. 1-3, 2016 (in Turkish).
I. E. Uysal, H. A. Ülkü, and H. Bağcı, SOLBOX-04, The Radio Science Bulletin, vol. 77, pp. 51 – 53, June 2016.
F. Dikmen, M. Akkuş, and H. A. Ülkü, “Correction to analytical evaluation of retarded-time potentials for SWG bases,” IEEE Trans. Antennas Propag., vol. 64, no. 6, p. 2587, June 2016.
H. A. Ülkü and A. A. Ergin, “Application of analytical expressions of retarded-time potentials to the MOT solution of integral equations,” IV. URSI-Turkish Scientific Congress National General Council Meeting, Akdeniz University, Antalya, Turkey, Oct. 20-22, 2008 (in Turkish).
F. Dikmen, H. A. Ülkü and A. A. Ergin, “Closed-form expressions of acoustic pressure fields at a constant density in time domain,” IV. URSI-Turkish Scientific Congress National General Council Meeting, Akdeniz University, Antalya, Turkey, Oct. 20-22, 2008 (in Turkish).

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