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Publication
SCI(E) Papers
  1. Lixun Zhu, Junho Park and Chang-Seop Koh, “A dynamic hysteresis model based on vector play model for iron loss calculation taking the rotating magnetic fields into account,” IEEE Trans. Magn., vol. @@, no. @, article#. @@@@, @@@@. (@@@@) (SCI) (To be published)
  2. Lixun Zhu, Jeonghyeok Lim, and Chang-Seop Koh, “Comparison of two-dimensional single sheet testers for the measurements of vector hysteresis and magnetostriction characteristics,” IJAEM, (To be published)
  3. Lixun Zhu, and Chang-Seop Koh, “Measurement and modelling of magnetostriction characteristics of highly grain-oriented electrical steel sheet by round-type two-dimensional single sheet tester,” IJAEM, (To be published)
  4. Lixun Zhu, and Chang-Seop Koh, “A novel vector hysteresis model using anisotropic vector play model taking into account rotating magnetic fields,” IEEE Trans. Magn., vol. 53, no. 6, article#. 7300604, 2017. (Intramural research grant of Chungbuk National University in 2015) (SCI)
  5. Bin Xia, Seokyeon Hong, Kyung Choi, and Chang-Seop Koh, “ Optimal design of winding transposition of power transformer using adaptive co-Kriging surrogate model,” IEEE Trans. Magn., vol. 53, no. 6, article#. 7203904, 2017. (NRF No. 2014R1A1A4A03004537) (SCI)
  6. Bin Xia, Ziyan Ren, and Chang-Seop Koh, “A novel reliability-based optimal design of electromagnetic devices based on adaptive dynamic Taylor Kriging,” IEEE Trans. Magn., vol. 53, no. 6, article#. 7201504, 2017. (NRF No. 2014R1A1A4A03004537) (SCI)
  7. Bin Xia, Ziyan Ren, Kyung Choi, and Chang-Seop Koh, “A novel subregion-based multi-dimensional optimization of electromagnetic devices assisted by Kriging surrogate model,” IEEE Trans. Magn., vol. 53, no. 6, article#. 9401204, 2017. (NRF No. 2014R1A1A4A03004537) (SCI)
  8. Wei Li, Weinong Fu, Chang-Seop Koh, and Yangyang Wang, “A stable iteration procedure of Newton’s method in finite element computation of nonlinear magnetic field problems with a vector hysteresis model,” IEEE Trans. Magn., vol. 53, no. 2, article#. 7300106, Feb. 2017. (SCI)
  9. Bin Xia, Gil-Gyun Jeong, and Chang-Seop Koh, “Co-Kriging assisted PSO algorithm and its application to optimal transposition design of power transformer windings for the reduction of circulating current loss,” IEEE Trans. Magn., vol. 52, no. 3, article#. 7208604, Mar. 2016. (NRF No. 2014R1A1A4A03004537 (SCI)
  10. Bin Xia, Tae-Woong Lee, Kyung Choi, and Chang-Seop Koh, “A novel adaptive dynamic Taylor Kriging and its application to optimal design of electromagnetic devices,” IEEE Trans. Magn., vol. 52, no. 3, article#. 7208704, Mar. 2016. (NRF No. 2014R1A1A4A03004537 (SCI)
  11. Ziyan Ren, Siying He, Dianhai Zhang, Yanli Zhang, and Chang-Seop Koh, “A possibility-based robust optimal design algorithm in preliminary design stage of electromagnetic devices,” IEEE Trans. Magn., vol. 52, no. 3, article#. 7001504, Mar. 2016. (SCI)
  12. Yanli Zhang, Qiang Li, Dianhai Zhang, Baodong Bai, Dexin Xie, and Chang-Seop Koh, “Magnetostriction of silicon steel sheets under different magnetization conditions,” IEEE Trans. Magn., vol. 52, no. 3, article#. 6100204, Mar. 2016. (SCI)
  13. Lixun Zhu, Hee-Sung Yoon, Hyun-Jin Cho, Doo-Jong Um, and Chang-Seop Koh, “Finite-element analysis of magnetostriction force in power transformer based on the measurement of anisotropic magnetostriction of highly grain-oriented electrical steel sheet,” IEEE Trans. Magn., vol. 52, no. 3, article#. 6100304, Mar. 2016. (Intramural research grant of Chungbuk National University in 2014) (SCI)
  14. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “Investigation of reliability analysis algorithms for effective reliability-based optimal design of electromagnetic devices,” IET Sci. Meas. Technol., vol. 10, no. 1, pp. 44-49, Jan. 2016. (SCI)
  15. Ziyan Ren, Yu Shan, Dianhai Zhang, Yanli Zhang, and Chang-Seop Koh, “A novel subdivision-based optimal design algorithm for multidimensional electromagnetic problems,” IEEE Trans. Magn., vol. 51, no. 11, article#. 7003104, Nov. 2015. (SCI)
  16. Wei Li, and Chang-Seop Koh, “Investigation of the vector Jiles-Atherton model and the fixed point method combined technique for time periodic magnetic problems,” IEEE Trans. Magn., vol. 51, no. 4, article#. 7402906, Apr. 2015. (SCI)
  17. Bin Xia, Ziyan Ren, and Chang-Seop Koh, “Comparative study on kriging surrogate models for meta-heuristic optimization of multi-dimensional electromagnetic problems,” IEEE Trans. Magn., vol. 51, no. 3, article#. 9400704, Mar. 2015. (KETEP No.20104010100600) (SCI)
  18. Bin Xia, Nyambayar Baatar, Ziyan Ren, and Chang-Seop Koh, “A numerically efficient multi-objective optimization algorithm: combination of dynamic Taylor Kriging and differential evolution,” IEEE Trans. Magn., vol. 51, no. 3, article#. 9400604, Mar. 2015. (NRF No.2014R1A1A4A03004537) (SCI)
  19. Ziyan Ren, Hyunjin Cho, Junmo Yeon, and Chang-Seop Koh, “A new reliability analysis algorithm with insufficient uncertainty data for optimal robust design of electromagnetic devices,” IEEE Trans. Magn., vol. 51, no. 3, article#. 7207404, Mar. 2015. (NRF No.2014R1A1A4A03004537) (SCI)
  20. Kwangyoung Jeong, Dianhai Zhang, Jaehoon Kwon, Ziyan Ren, and Chang-Seop Koh, “Measurement and Comparison of Iron Loss in Bonded- and Embossed-Type Segmented Stator Cores for IPMSM,” Journal of Electrical Engineering and Technology (JEET), vol.9, no.6, pp. 2013-2018, Nov. 2014. (KETEP No.20104010100600) (SCIE)
  21. Ziyan Ren, Doojong Um, and Chang-Seop Koh, “Optimal design of inverse electromagnetic problems with uncertain design parameters assisted by reliability and design sensitivity analysis,” Journal of Magnetics (JoM), vol. 19, no. 3, pp. 266-272, Sep. 2014. (NRF 2011) (SCIE)
  22. Bin Xia, Ziyan Ren, Yanli Zhang, and Chang-Seop Koh, “An adaptive optimization algorithm based on Kriging interpolation with spherical model and its application to optimal design of switched reluctance motor,” Journal of Electrical Engineering and Technology (JEET), vol. 9, no.5. pp.1544-1550, Sep. 2014. (KETEP No.20104010100600) (SCIE) Impact Factor: 0.517
  23. Kwangyoung Jeong, Ziyan Ren, Heesung Yoon, and Chang-Seop Koh, “Measurement of stator core loss of an induction motor at each manufacturing process,” Journal of Electrical Engineering and Technology (JEET), vol.9, no.4, pp.1309-1314, July, 2014. (KETEP No.20104010100600) (SCIE)
  24. Bin Xia, Ziyan Ren, and Chang-Seop Koh, “Utilizing Kriging Surrogate Models for Multi-objective Robust Optimization of Electromagnetic Devices,” IEEE Trans. Magn., vol. 50, no. 2, article#. 7017104, Feb, 2014.(KETEP No.20104010100600) (SCI)
  25. Zhang Dianhai, Ziyan Ren, and Chang-Seop Koh, “Optimal Design of Powder-aligning and Magnetizing Fixtures for an Anisotropic Bonded NdFeB Permanent Magnet,” IEEE Trans. Magn., vol. 50, no. 2, article#. 7017204, Feb, 2014. No.10038973 (SCI)
  26. Nyambayar Baatar, Kwang-Young Jeong and Chang-Seop Koh, “Adaptive Parameter Controlling Non-dominated Ranking Differential Evolution for Multi-objective Optimization of Electromagnetic Problems,” IEEE Trans. Magn., vol. 50, no. 2, article#. 7017504, Feb. 2014. (KETEP No.20104010100600) (SCI)
  27. Ziyan Ren, Chanhyuk Park, and Chang-Seop Koh, “Numerically Efficient Algorithm for Reliability-Based Robust Optimal Design of TEAM Problem 22,” IEEE Trans. Magn., vol. 50, no. 2, pp. 7016304, Feb. 2014. (NRF 2011) (SCI)
  28. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “Multi-Objective Optimization Approach to Reliability-Based Robust Global Optimization of Electromagnetic Device,” COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 33, no.1/2, pp.191-200, 2014. (NRF 2011) (SCIE)
  29. Heesung Yoon and Chang-Seop Koh, “Vector Magnetic Property of Electrical Steel Sheet and its Influence on Distributions of Magnetic Field and Iron loss for Electrical Machines,” COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 33, no.1/2, pp.14-27, 2014. (KETEP No.20104010100600) (SCIE)
  30. Dianhai Zhang, Ziyan Ren and Chang-Seop Koh, “Multi-Objective Optimal Design of a NEMA Design D Three-phase Induction Machine Utilizing Gaussian-MOPSO Algorithm,” Journal of Electrical Engineering and Technology(JEET), Vol. 9, No. 1, pp. 184-189, Jan. 2014. (SCIE) (KETEP No.20104010100600)
  31. Heesung Yoon, Seok-Myeong Jang, and Chang-Seop Koh, “Iron loss analysis of a permanent magnet rotating machine taking into account of the vector hysteretic properties of electrical steel sheet,” Journal of International Conference on Electrical Machines and Systems (JICEMS), vol.2, no.2, pp.165-170, 2013. (KETEP No.20104010100600)
  32. Ziyan Ren and Chang-Seop Koh, “A second-order design sensitivity-assisted Monte Carlo simulation method for reliability evaluation of the electromagnetic devices,” Journal of Electrical Engineering and Technology, Vol. 8, No. 4, pp. 780-786, July 2013. (SCIE) (NRF 2011)
  33. Hyo-Jun Kim, and Chang-Seop Koh, “Design of a powder-aligning-fixture for a 4-pole anisotropic bonded Nd-Fe-B ring-type permanent magnet,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2363-2366, May 2013. (SCI) (Ministry of Knowledge Economy, MKE, No.10043780)
  34. Bin Xia, Minh-Trien Pham, Yanli Zhang, and Chang-Seop Koh, “A global optimization algorithm for electromagnetic devices by combining adaptive Taylor Kriging and particle swarm optimization,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2061-2064, May 2013. (SCI) (NRF 2011)
  35. Heesung Yoon, Yanli Zhang, and Chang-Seop Koh, “Convergence stabilization of E&S vector hysteresis model incorporated with finite element analysis of electrical machines,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2371-2374, May 2013. (SCI) (KETEP No.20104010100600)
  36. Nyambayar Baatar, Minh-Trien Pham, and Chang-Seop Koh, “Multiguiders and nondominate ranking differential evolution algorithm for multiobjective global optimization of electromagnetic problems,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2105-2108, May 2013. (SCI) (NRF 2011)
  37. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “An improved robust optimization algorithm: second-order sensitivity assisted worst case optimization,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2109-2112, May 2013. (SCI) (NRF 2011)
  38. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “New reliability-based robust design optimization algorithms for electromagnetic devices utilizing worst case scenario approximation,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2137-2140, May 2013. (SCI) (NRF 2011)
  39. Dianhai Zhang, Hyo-Jun Kim, Wei Li, and Chang-Seop Koh, “Analysis of magnetizing process of a new anisotropic bonded NdFeB permanent magnet using FEM combined with Jiles-Atherton hysteresis model,” IEEE Trans. on Magnetics, vol. 49, no. 5, pp.2221-2224, May, 2013. (SCI) (Ministry of Knowledge Economy, MKE, No.10038973)
  40. Nyambayar Baatar, Dianhai Zhang, and Chang-Seop Koh, “An improved differential evolution algorithm adopting λ-best mutation strategy for global optimization of electromagnetic devices,” IEEE Trans. Magn., vol. 49, no. 5, pp. 2097-2100, May 2013. (SCI) (KETEP No.20104010100600)
  41. Z. Y. Ren, D. H. Zhang, and C. S. Koh, “A new sensitivity-based reliability calculation algorithm in the optimal design of electromagnetic devices,” Journal of Electrical Engineering and Technology, Vol.8, No.2, pp.331-338, Mar, 2013. (NRF 2011)
  42. Z. Y. Ren, M. T. Pham, and C. S. Koh, “Robust global optimization of electromagnetic devices with uncertain design parameters: comparison of the worst case optimization methods and multi-objective optimization approach using gradient index,” IEEE Trans. Magn., vol.49, no.2, pp.851-859, Feb. 2013. (NRF 2011)
  43. Heesung Yoon, Minho Song, and Chang-Seop Koh, “Improved dynamic E&S vector hysteresis model for non-elliptic magnetic flux density condition and its implementation to finite element method for iron loss analysis of a three-phase transformer,” Materials Science Forum, vol. 721, pp. 147-152, Jun. 2012. 충남대, No SCI (SCOPUS)
  44. Ziyan Ren, Dianhai Zhang, Minh-Trien Pham, and Chang Seop Koh, “A new reliability calculation algorithm based on sensitivity analysis and its application to reliability-based robust global optimization of electromagnetic device with uncertain design variables,” Materials Science Forum, vol. 721, pp. 165-170, Jun. 2012. 과학재단, No SCI (SCOPUS)
  45. Dianhai Zhang, Chang Soon Park, and Chang Seop Koh, “A new optimal design method of rotor slot of three-phase squirrel cage induction motor for NEMA class D speed-torque characteristic using multi-objective optimization algorithm,” IEEE Trans. on Magnetics, vol. 48, no. 2, pp. 879-882, Feb. 2012. 충남대
  46. Minh-Trien Pham, Dianhai Zhang, and Chang Seop Koh, “Multi-guider and cross-searching approach in multi-objective particle swarm optimization for electromagnetic problems,” IEEE Trans. on Magnetics, vol. 48, no. 2, pp. 539-542, Feb. 2012. 과학재단
  47. Heesung Yoon, Minho Song, Inhyun Kim, Pan Seok Shin, and Chang Seop Koh, “Accuracy improved dynamic E&S vector hysteresis model and its application to analysis of iron loss distribution in a three-phase induction motor,” IEEE Trans. on Magnetics, vol. 48, no. 2, pp. 887-890, Feb. 2012. 충남대
  48. Dianhai Zhang and Chang Seop Koh, “An efficient semianalytic computation method of magnetic field for a circular coil with rectangular cross section,” IEEE Trans. on Magnetics, vol. 48, no. 1, pp. 62-68, Jan. 2012. 충남대
  49. Wei Li, Inhyun Kim, Seok Myeong Jang, and Chang Seop Koh, ”Hysteresis modeling for electrical steel sheet using improved vector Jiles-Atherton hysteresis model,” IEEE Trans. on Magnetics, vol. 47, no. 10, pp. 3821-3824, Oct. 2011 충남대
  50. Minh-trien Pham, Ziyan Ren, Wei Li, and Chang Seop Koh, “Optimal design of a Thomson-coil actuator utilizing mixed-integer-discrete-continuous variables global optimization algorithm,” IEEE Trans. on Magnetics, vol. 47, no. 10, pp. 4163-4166, Oct. 2011 홍익대
  51. Yong Bae Kim, Hong Soon Choi, Chang Seop Koh, and Pan Seok Shin, “A back EMF optimization of double layered large-scale BLDC motor by using hybrid optimization method,” IEEE Trans. on Magnetics, Vol.47, No.5, pp.998-1001, May 2011 ETC
  52. Heesung Yoon, Inkyun Kim, Pan Seok Shin, and Chang Seop Koh, “Finite element implementation of a generalized Chua-type vector hysteresis model and application to iron loss analysis of three-phase transformer,” IEEE Trans. on Magnetics, Vol.47, No.5, pp.1122-1125, May 2011 홍익대
  53. Minho Song, Heesung Yoon, Haiwon Yang, and Chang Seop Koh, “A generalized Chua-type vector hysteresis model for both the non-oriented and grain-oriented electrical steel sheets,” IEEE Trans. on Magnetics, Vol.47, No.5, pp.1146-1149, May 2011, KETEP(한양대)
  54. Wei Li, Ziyan Ren, Young Woo Jeong, and Chang Seop Koh, “Optimal shape design of a Thomson-coil actuator utilizing generalized topology optimization based on equivalent circuit method,” IEEE Trans. on Magnetics, Vol.47, No.5, pp.1246-1249, May 2011, NRF
  55. Ziyan Ren, Minh-Trien Pham, Minho Song, Dong-Hun Kim, and Chang Seop Koh, “A robust global optimization algorithm of electromagnetic devices utilizing gradient index and muilti-objective optimization method,” IEEE Trans. on Magnetics, Vol.47, No.5, pp.1254-1257, May 2011 NRF
  56. Wei Li, Young Woo Jung, and Chang Seop Koh, “An adaptive equivalent circuit modeling method for the eddy current-driven electromechanical system”, IEEE Trans. on Magnetics, vol.46, No.6, pp.1859~1862, June 2010, NO_Fund
  57. Hyo Jun Kim, Chang Seop Koh, and Pan Seok Shin, “A new anisotropic bonded NdFeB permanent magnet and its application to a small DC motor,” IEEE Trans. on Magnetics, vol. 46, no. 6, pp. 2314-2317, June 2010, NO_Fund
  58. Nyambayar Baatar, Hee Sung Yoon, Minh Trien Pham, Pan Seok Shin, and Chang Seop Koh, “Shape optimal design of a 9-pole 10-slot PMLSM for detent force reduction using adaptive response surface method,” IEEE Trans. on Magnetics, vol. 45, no. 10, pp. 4562-4565, October 2009, KOSEF
  59. Hee Sung Yoon, Young Hwan Eum, Yanli Zhang, Pan-Seok Shin, and Chang Seop Koh, “Comparison of magnetic reluctivity models for FEA considering two-dimensional magnetic properties,” IEEE Trans. on Magnetics, vol. 45, no. 3, pp. 1202-1205, March 2009, KOSEF
  60. Yanli Zhang, Young Hwan Eum, Wei Li, Dexin Xie, and Chang Seop Koh, “An improved modeling of vector magnetic properties of electrical steel sheet for FEM application and its experimental verification,” IEEE Trans. on Magnetics, vol. 45, no. 3, pp. 1162-1165, March 2009, KOSEF and China fund
  61. Pan Seok Shin, Sung Hyun Woo, and Chang Seop Koh, “An optimal design of large scale permanent magnet pole shape using adaptive response surface method with latin hypercube sampling strategy,” IEEE Trans. on Magnetics, vol. 45, no. 3, pp. 1214-1217, March 2009, ETC
  62. Yanli Zhang, Young Whan Eum, Dexin Xie, and Chang Seop Koh, ”An improved engineering model of vector magnetic properties of grain-oriented electrical steels,” IEEE Trans. on Magnetics, vol. 44, No.11, November 2008, pp. 3181-3184, KESRI
  63. P. S. Shin, S. H. Woo, Y. Zhang, and C. S. Koh, “An application of Latin hypercube sampling strategy for cogging torque reduction of large-scale permanent magnet motor,” IEEE Trans. on Magnetics, vol. 44, No.11, November 2008, pp. 4421-4424 , ETC
  64. S. W. Youn, J. J. Lee, H. S. Yoon, and C. S. Koh, “A new cogging-free permanent-magnet linear motor,” IEEE Trans. on Magnetics, vol. 44, No. 7, pp.1785-1790, July 2008, KOTEF
  65. Yanli Zhang, Dexin Xie, Baodong Bai, Hee Sung Yoon, Chang Seop Koh, “New Development of Monohedral Magnet for MRI Using the Combination of Genetic Algorithm and FEM-NESM,” IEEE Trans. on Magnetics, Vol. 44, No. 6, pp. 1266-1269, June. 2008, KOSEF
  66. Yanli Zhang, Dexin Xie, Baodong Bai, Hee Sung Yoon , Chang Seop Koh, “A Novel Optimal Design Method of Passive shimming for Permanent MRI Magnet,” IEEE Trans. on Magnetics, Vol. 44, No. 6, pp. 1058-1061, June 2008, ETC Fund
  67. H. J. Kim, D. H. Kim, C. S. Koh, and P. S. Shin, “Application of Polar Anisotropic NdFeB Ring Type Permanent Magnet to Brushless DC Motor,” IEEE Trans. on Magn., Vol. 43, No. 6, pp. 2522-2524, June. 2007, JAWHA
  68. Y. Yao, C. S. Koh, S. Yang, G. Ni, “A Global Optimization Algorithm Based on C1 Piecewise Response Surface Patches,” IEEE Trans. on Magnetics, Vol. 43, No. 4, pp. 1629-1632, April. 2007, ETC Funds
  69. Y. K. Choi, H. S. Yoon, and C. S. Koh, “Pole-Shape Optimization of a Switched-Reluctance Motor for Torque Ripple Reduction,” IEEE Trans. on Magnetics, Vol. 43, No. 4, pp. 1797-1800, April. 2007, KOTEF
  70. P. S. Shin, H. D. Kim, G. B. Chung, H. S. Yoon, G. S. Park, and C. S. Koh,, “Shape Optimization of a Large-Scale BLDC Motor Using an Adaptive RSM Utilizing Design Sensitivity Analysis,” IEEE Trans. on Magnetics, Vol. 43, No. 4, pp. 1653-1656, April. 2007, OTHER
  71. C .S. Koh, J. S. Ryu, and K. Fujiwara, “Convergence Acceleration of the Newton-Raphson Method Using Successive Quadratic Function Approximation of Residual,” IEEE Trans. on Magn., vol. 42, No.4, pp.611-614, April 2006. KESRI R-2002-B-031
  72. J. S. Ryu, Y. Yao, C. S. Koh, and Y. J. Shin, “3-D Optimal Shape Design of Pole Piece in Permanent Magnet MRI Using Parameterized Nonlinear Design Sensitivity Analysis,” IEEE Trans. on Magn., vol. 42, No.4, pp.1351-1354, April 2006. KRF, MOEHRD R-05-2003-000-10199-0
  73. Y. Yao, Y. Fang, C. S. Koh, and G. Ni, “A new design method for completely open architecture permanent magnet for MRI,” IEEE Trans. on Magnetics, vol. 41, No. 5, pp. 1504-1507, May 2005 ETC Fund
  74. J. S. Ryu, Y. Yao, C. S. Koh, S. Yoon, and D. S. Kim, ”Optimal shape design of 3-D nonlinear electromagnetic devices using parameterized design sensitivity analysis,” IEEE Trans. on Magnetics, Vol. 41, No. 5, pp.1792-1795, May 2005 No Grant
  75. Y. Yao, C. S. Koh, G. Ni, and D. Xie, “3-D nonlinear transient eddy current calculation of online power transformer under DC bias,” IEEE Trans. on Magnetics, vol. 41, No. 5, pp.1804-1843, May 2005 ETC Fund
  76. Y. Yao, C. S. Koh, D. Xie, “Three-Dimensional Optimal Shape Design of Magnetic Pole in Permanent Magnet Assembly for MRI Taking Account of Eddy Currents due to Gradient Coil Field,” IEEE Trans. on Magnetics, Vol. 40, No.2, pp.1164-1167, March 2004, KRF E00150
  77. Y. Yao, J. S. Ryu, C. S. Koh, D. Xie,” A Novel Mesh Regeneration Using Structural Deformation Analysis for 3D Shape Optimization of Electromagnetic Devices,” IEEE Trans. on Magnetics, vol. 40, No.2, pp. 1009-1012, March 2004, No Grant
  78. Y. Yao, J. S. Ryu, C. S. Koh and D. Xie, “Robust 3-D shape optimization of Electromagnetic Devices by Combining Sensitivity Analysis and Adaptive Geometric Parameterization,” IEEE Trans. on Magnetics, Vol. 40, No.2, pp. 1200-1203, March 2004, KRF E00150
  79. Y. Yao, D. Xie, C. S. Koh, J. S .Ryu, and T. G, Um, “Utilizing Design Sensitivity Analysis for 3D Optimization of Transformer Tank Shields Considering Eddy Currents,” COMPEL, Vol. 23, pp. 506-517, Issue 2, 2004 KRF E00150
  80. C. S. Koh, and J. S. Seol, “New Cogging Torque Reduction Method for Brushless Permanent Magnet Motors,” IEEE Trans. on Magnetics, Vol. 39, No. 6, pp. 3503-3506, Nov. 2003
  81. Seung-yong Hahn, Song-yop Hahn, and Chang Seop Koh, “An effective hysteresis loss computation for HTS bulk material,” IEEE Transactions on Applied Superconductivity, Vol.13, Issue: 2, pp. 2259-2262, June 2003
  82. C. S. Koh, B. K. Kang, J. S. Ryu, and J. S. Seol, “The effects of the distribution of residual magnetization on the cogging torque and switching signals in PM motors,“ IEEE Trans. on Magnetics, Vol. 38, No.2, pp.1217-1220, March 2002
  83. Seung-Yong Hahn; Woo-Seok Kim; Ji Hoon Kim, Chang-Seop Koh, Song-Yop Hahn, “Low speed FES with induction motor and generator, IEEE Transactions on Applied Superconductivity,” Volume: 12, Issue: 1, March 2002, Page(s): 746-749
  84. S. Y. Hahn, J. H. Kim, C. S. Koh, and S. Y. Hahn, “3-D field analysis of a superconducting bulk magnet,” IEEE Trans. on Applied Superconductivity, Vol.11, No.1,pp.1996-1999. march 2001
  85. C. S. koh, K. S. Jung, and S. Y. Hahn, “A design of eddy current controller in electron gun using 3D boundary element method,” IEEE Trans. on Magn., Vol.36, No.4, pp. 1800-1903, July 2000
  86. C.S.Koh, S.Y.Hahn, and G.W.Park, “Vector hysteresis modeling by combining Stoner-Wohlfarth and Preisach models,” IEEE Trans. on Magn., Vol.36, No.4, pp.1254-1267, July 2000
  87. J. K. Cho, C. H. Lee, H. K .Jung, Y. W. Ahn, S. Y. Hahn, and C. S. Koh, ”Multiresolution analysis for permeability reconstruction using wavelet,” IEEE Trans. on Magn., Vol.35, No.5, pp.3757-3759, September, 1999
  88. C. S .Koh, and S. K. Hong, “Finite element analysis of magnetizer using Preisach model,” IEEE Trans. on Magn., Vol.35, No.3, pp.1227-1230, May, 1999
  89. C. S. Koh, M. K. Kim, H. K. Jung, B. S. Suh and S. Y. Hahn, “Electric Resistivity Tomography for Geophysical Inverse Problems,” IEEE trans. On Magn., Vol. 33(2), pp. 1852-1855, March 1997
  90. D. J. Bae, D. W. Kim, H. K. Jung, S. Y. Hahn and C. S. Koh, “Determination of induction motor parameters by using neural network based on FEM results,” IEEE Trans. On Magn., Vol. 33 (2), pp.1924-1927, March 1997
  91. C. S. Koh, H. S. Yoon, K. W. Nam and H. S. Hong, “Magnetic pole shape optimization of permanent magnet motor for reduction of cogging torque,” IEEE Trans. on Magn., Vol. 33(2), pp.1822-1827, March 1997.
  92. C. S. Koh, M. C. Joe, B. H. Kang and K. J. Joo, “Design Optimization of Coil Distribution in Deflection Yoke for Color Picture Tube,” IEEE Trans. on Magn., Vol. 32(3), pp. 1665-1668, May 1996
  93. G. Fuat Uler, Osama A. Mohammed and C. S. Koh, “Design Optimization of Electrical Machines using Genetic Algorithms,” IEEE Trans. on Magn., Vol. 31(3), pp. 2008-2011, May 1995
  94. C. S. Koh, S. Y. Hahn, and Osama. A. Mohammed, “Nonlinear shape design sensitivity analysis of magnetostatic problems using boundary element method,” IEEE Trans. on Magn., Vol. 31(3), pp. 1944-1947, May 1995
  95. F. Uler and Osama A. Mohammed and C. S. Koh, “Utilizing genetic algorithm for the optimal design of electromagnetic devices,” IEEE Trans. on Magn., Vol. 30(6), pp. 4296-4298, November 1994
  96. C. S. Koh, S. Y. Hahn and Osama. A. Mohammed, “Detection of magnetic body using artificial neural network with modified simulated annealing,” IEEE Trans. on Mag., Vol. 30(5), pp. 3644-3647, September 1994
  97. C. S. Koh, J. O. Kim, S. Y. Hahn and Osama. A. Mohammed, “Optimum design of Voice Coil Motor with constant torque coefficients using evolution strategy,” Journal of Applied Physics, Vol. 75(10), pp. 6045-6047, 15 May 1994
  98. C. S. Koh, S. Y. Hahn, T. K. Chung and K. Choi, “Design sensitivity analysis for shape optimization of 3-D electromagnetic devices,” IEEE Trans. on Magn., Vol. 29(2), pp. 1753-1757, March 1993
  99. C. S. Koh, S. Y. Hahn, H. K. Jung and K. Choi, “A continuum approach in shape design sensitivity analysis of magnetostatic problems using the boundary element method,” IEEE Trans. on Magn., Vol. 29(2), pp. 1771-1774, March 1993
  100. C. S. Koh, S. Y. Hahn, H. K. Jung and T. K. Chung, “A sensitivity analysis using boundary element method for shape optimization of electromagnetic devices,” IEEE Trans. on Magn., Vol. 28(2), pp. 1577-1580, March 1992.
  101. C. S. Koh, K. Choi, S. Y. Hahn, H. K. Jung and K. S. Lee, “An adaptive finite element scheme using multi-grid method for magnetostatic problems,” IEEE Trans. on Magn., Vol. 25(4), pp. 2959-2961, July 1989.
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