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Publication
International conference papers
  1. Lixun Zhu, Minh-Trien Pham, Chang-Seop Koh, “On the construction of vector Pareisach model based on magnetic measurements for iron loss calculation in laminated core,” The 21th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2017), June 17- June 22, 2017, Deajeon, Korea. (Section PC5-A7-11)
  2. Lixun Zhu, Jeongheok Lim, 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,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section WP082-9)
  3. Lixun Zhu, and Chang-Seop Koh, “A novel iron loss calculation algorithm using vector stop model taking account of the rotating magnetic fields,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section WP082-2)
  4. Bin Xia, Seokyeon Hong, Kyung Choi, and Chang-Seop Koh, “Optimal design of winding transposition of power transformer using adaptive co-Kriging surrogate model,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section WP012-3)
  5. 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,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section TP081-8)
  6. Junmo Yeon, Bin Xia, Lixun Zhu, and Chang-Seop Koh, “Multi-objective optimization of IPMSM with consideration of torque characteristics and iron loss,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section TP081-5)
  7. Bin Xia, Minh-trien Pham, and Chang-Seop Koh, “Utilizing adaptive dynamic Taylor Kriging assisted multi-objective DE algorithm for optimization design of electromagnetic device,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section TP051-10)
  8. Bin Xia, Ziyan Ren, and Chang-Seop Koh, “A novel reliability-based optimal design of electromagnetic devices based on adaptive dynamic Taylor Kriging,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section MP042-10)
  9. Minh-trien Pham, and Chang-Seop Koh, “Differential evolution using adaptive mutation scaling factor for multi-objective electromagnetic constrainted optimization problems,” The 17th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2016), Miami, USA, Nov 13-16, 2016. (Section MP042-8)
  10. Lixun Zhu, Jeonghyeok Lim, and Chang-Seop Koh, “Comparison of two-dimensional single sheet testers for the measurements of vector hysteresis and magnetostriction characteristics,” 14th International Workshop on 1&2-Dimensional Magnetic Measurement and Testing, Tianjin, China, Sep. 23-25, 2016. (Section PD-3)
  11. 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,” 14th International Workshop on 1&2-Dimensional Magnetic Measurement and Testing, Tianjin, China, Sep. 23-25, 2016. (Section OD-1)
  12. Bin Xia, Junmo Yeon, and Chang-Seop Koh, “Optimal Shape Design of A Multi-Layered Interior Permanent Magnet Synchronous Machine Using Adaptive Dynamic Taylor Kriging Model,” Scientific Program of 14th International Workshop on Optimization and Inverse Problems in Electromagnetism (OIPE2016), Rome, Italy, Sep. 13-15, 2016.
  13. Doo-Jong Um, Hyun-Jin Cho, Chan-Hyuk Park and Chang-Seop Koh, “Measurement of magnetostriction characteristics of a highly grain-oriented electrical steel sheet,” ISEF 2015-17th International Symposium on Electromagnetic Fields, Valencia, Spain, Sep. 10-12, 2015.
  14. Bin Xia, Jun-Mo Yeon and Chang-Seop Koh, “Optimal shape design of a multi-layered interior permanent magnet synchronous machine using adaptive dynamic Taylor Kriging model,” ISEF 2015-17th International Symposium on Electromagnetic Fields, Valencia, Spain, Sep. 10-12, 2015.
  15. Yanli Zhang, Zheng Cao, Bin Xia, Baodong Bai, Dexin Xie, and Chang-Seop Koh, “Measurement and computation of rotational core loss considering higher harmonic components of magnetic flux density waveform,” The 20th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2015), June 28- July 2, 2015, Montreal, Canada. (Section PC5-16)
  16. Dianhai Zhang, Xu Tao, Yanli Zhang, and Chang-Seop Koh, “Calculation of residual magnetic fluc density distribution with consideration of aligning field for anisotropic bonded NdFeB magnets,” The 20th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2015), June 28- July 2, 2015, Montreal, Canada. (Section PD6-11)
  17. 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,” The 20th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2015), June 28- July 2, 2015, Montreal, Canada. (Section PD2-7)
  18. Ziyan Ren, Yu Shan, Yanli Zhang, Chang-Seop Koh, “A novel possibility-based robust optimal design algorithm in preliminary design stage of electromagnetic devices,” The 20th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2015), June 28- July 2, 2015, Montreal, Canada. (Section PB4-4)
  19. Bin Xia, Gil-Gyun Jeong, and Chang-Seop Koh, “Co-Kriging assisted PSO algorithm and its application to optimal transposition design of power transformer winding for the reduction of circulating current loss,” The 20th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2015), June 28- July 2, 2015, Montreal, Canada. (Section PA4-8)
  20. 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 a highly grain-oriented electrical steel sheet,” The 20th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2015), June 28- July 2, 2015, Montreal, Canada. (Section PA3-14)
  21. Dianhai Zhang and Chang-Seop Koh, “Topology optimization of interior permanent magnet machine to improve the utilization ratio of permanent magnet,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section PA1:2)
  22. Dianhai Zhang and Chang-Seop Koh, “Design of customized distribution of residual magnetic flux density for reducing cogging torque in BLDC motor with anisotropic bonded NdFeB magnet,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section PC1:5)
  23. Ziyan Ren, Hyunjin Cho, and Chang-Seop Koh, “Reliability analysis based on possibility theory with insufficient uncertainty data for optimal design of electromagnetic devices,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section PA4:16)
  24. Ziyan Ren, Jaehoon Kwon, and Chang-Seop Koh, “A new possibility-based optimal design algorithm to deal with uncertainties of electromagnetic devices,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section OD3:3)
  25. Ziyan Ren, Nyambayar Baatar, and Chang-Seop Koh, “A novel black hole assisted differential evolution algorithm for optimal design of inverse electromagnetic problem,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section PF3:1)
  26. Bin Xia, Ziyan Ren, and Chang-Seop Koh, “Comparative study on surrogate models for meta-heuristic optimization of multi-dimensional electromagnetic problems,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section OE3:3)
  27. Bin Xia, Nyambayar Baatar, and Chang-Seop Koh, “A numerically efficient multi-objective electromagnetic optimization algorithm combination of dynamic Kriging and differential evolution,” The sixteenth Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2014), Annecy, France, May 25-28, 2014. (Section PA4:6)
  28. Ziyan Ren, Bin Xia, and Chang-Seop Koh, “Multi-objective robust design of switched reluctance motor against manufacturing tolerance by worst-case scenario and Kriging,” IEEE International Magnetics Conference (Intermag 2014), pp.1836-1837, May 4-8, Dresden, Germany, 2014.
  29. Kwang Young Jeong, Ziyan Ren, Dianhai Zhang, IlKwon Jung, and Chang-Seop Koh, “Comparison of iron losses in bonded and Embossed type segmented stator core for IPMSM,” IEEE International Magnetics Conference (Intermag 2014), pp.1852-1853, May 4-8, Dresden, Germany, 2014.
  30. Dianhai Zhang, and Chang-Seop Koh, “Magnetizing analysis incorporated of FEM taking into account forming process for a 4-pole anisotropic bonded NdFeB Magnet,” IEEE International Magnetics Conference (Intermag 2014), pp.2287-2288, May 4-8, Dresden, Germany, 2014.
  31. Ziyan Ren and Chang-Seop Koh, “Selecting proper reliability analysis algorithm for reliability-based optimal design of electromagnetic devices,” The Ninth International Conference on Computation in Electromagnetics (CEM 2014), 31 March-1 April, London, UK. (P4-05).
  32. Bin Xia, Ziyan Ren, and Chang-Seop Koh, “Selecting proper Kriging surrogate model for optimal design of electromagnetic problem,” The Ninth International Conference on Computation in Electromagnetics (CEM 2014), 31 March-1 April, London, UK. (P4-13).
  33. Kwang-Young Jeong, Chan-Hyuck Park, and Chang-Seop Koh, “Comparison of Iron Loss at Different Manufacturing Process of Actual Stator Core,” The 16th International Conference on Electrical Machines and Systems (ICEMS 2013), Oct.26-29, Busan, Korea.
  34. Dianhai Zhang, Ziyan Ren and Chang-Seop Koh, “Hysteresis Modeling of Anisotropic and Isotropic Bonded NdFeB PM Utilizing The Jiles-Atherton Hysteresis Model,” The 16th International Conference on Electrical Machines and Systems (ICEMS 2013), Oct.26-29, Busan, Korea.
  35. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “Multi-objective Worst-Case Scenario Robust Optimal Design of Switched Reluctance Motor Incorporated with FEM and Kriging,” The 16th International Conference on Electrical Machines and Systems (ICEMS 2013), Oct.26-29, Busan, Korea.
  36. Dianhai Zhang, Ziyan Ren, and Chang-Seop Koh, “Vector Jiles-Atherton hysteresis model and Its application to magnetizing analysis for an anisotropic bonded NdFeB magnet,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30- July 4, 2013, Budapest, Hungary.
  37. Dianhai Zhang, Hyo-Jun Kim, and Chang-Seop Koh, “Shape optimal design of a powder-aligning-fixture of four-pole anisotropic bonded NdFeB ring magnet,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30- July 4, 2013, Budapest, Hungary.
  38. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “A numerically efficient reliability-based robust optimal design algorithm: application to TEAM 22,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  39. Ziyan Ren, Dianhai Zhang, and Chang-Seop Koh, “Multi-objective optimization approach to reliability-based optimal design of electromagnetic problems,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  40. Ziyan Ren, Bin Xia, Nyambayar Baatar, and Chang-Seop Koh, “Worst-Case-Scenario Robust Optimization Assisted by Dynamic Kriging Using Differential Evolution,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  41. Ziyan Ren, Chanhyuk Park, and Chang-Seop Koh, “A numerically efficient reliability-based robust optimal design algorithm: application to TEAM 22,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  42. Bin Xia, K.Y. Jeong, and Chang-Seop Koh, “Utilizing Kriging Surrogate Models for Multi-objective Robust Optimization of Electromagnetic Devices,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  43. Nyambayar Baatar, K.Y. Jeong, and Chang-Seop Koh, “Adaptive Parameter Controlling Non-dominated Ranking Differential Evolution for Multi-objective Optimization of Electromagnetic Problems,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  44. Heesung Yoon and Chang-Seop Koh, “Influences of Isotropic and Anisotropic Magnetostriction on Three-Phase Transformer with Highly Grain-Oriented Electrical Steel Sheet,” The 19th COMPUMAG Conference on the Computation of Electromagnetic Fields (COMPUMAG2013), June 30 - July 4, 2013, Budapest, Hungary.
  45. Heesung Yoon and Chang Seop Koh, “Convergence stabilization of E&S vector hysteresis model incorporated with non-linear finite element analysis of electromagnetic devices,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  46. Ziyan Ren, Dianhai Zhang, and Chang Seop Koh, “A new reliability calculation algorithm using FEM incorporated with second-order sensitivity analysis for electromagnetic devices,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  47. Nyambayar Baatar, Dianhai Zhang, and Chang Seop Koh, “An improved differential evolution algorithm adopting λ-best mutation strategy for a global optimization of electromagnetic devices,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  48. Ziyan Ren, Dianhai Zhang, and Chang Seop Koh, “Comparison of the reliability-based robust design optimization algorithms in the optimal design of electromagnetic devices: gradient index and worst-case-scenario based algorithms,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  49. Heesung Yoon, Chang Seop Koh, and Seok-Myeong Jang, “Iron loss prediction of an wind turbine permanent magnet synchronous generator utilizing E&S vector hysteresis model incorporated with FEM,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  50. Nyambayar Baatar, Minh-Trien Pham, and Chang Seop Koh, “Multi-guiders and non-dominate ranking differential evolution algorithm for multi-objective global optimization of electromagnetic problems,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  51. Bin Xia, Minh-Trien Pham, and Chang Seop Koh, “An efficient global optimization algorithm of electromagnetic devices by combining adaptive Taylor kriging and particle swarm optimization,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  52. Ziyan Ren, Dianhai Zhang, Chang Seop Koh, “A robust optimization algorithm: worst-case scenario approach assisted by design sensitivity analysis,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  53. Ziyan Ren, Dianhai Zhang, and Chang Seop Koh, “Constraint reliability incorporated design optimization of the electromagnetic device with uncertain design variables,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  54. Hyo-Jun Kim and Chang Seop Koh, “Design of a powder aligning fixture for a 4-pole ansotropic bonded NdFeB ring magnet,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  55. Dianhai Zhang, Hyo-Jun Kim, and Chang Seop Koh, “Analysis of a new anisotropic bonded NdFeB permanent magnet magnetizer using FEM combined with Jiles-Atherton Hysteresis model,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  56. Dianhai Zhang and Chang Seop Koh, “Apply multi-objective optimization approach to design of rotor slot shape for NEMA design D three-phase squirrel cage induction machine with high efficiency,” CEFC 2012, Oita, Japan, Nov. 11-14, 2012.
  57. Heesung Yoon, Chang Seop Koh, “Vector Magnetic Property of Electrical Steel Sheet and its Influence on Distributions of Magnetic Field and Iron Loss of Electrical Machines,” ICEF 2012, Dalian, China, June 19-21, 2012.
  58. Heesung Yoon, Chang Seop Koh, “Influence of Vector Hysteretic Property of Non-Oriented Silicon Steel Sheet on Three-Phase Induction Motor Model,” ICEF 2012, Dalian, China, June 19-21, 2012.
  59. Yanli Zhang, Yumei Li, Yang Liu, Dexin Xie, Chang Seop Koh, “Finite Element Analysis of Induction Motor Core Considering Rotating Magnetization in Electrical Steel Sheets,” ICEF 2012, Dalian, China, June 19-21, 2012.
  60. Ziyan Ren, Dianhai Zhang, Chang Seop Koh, “Multi-Objective Optimization Approach to Reliability-Based Robust Global Optimization of Electromagnetic Device,” ICEF 2012, Dalian, China, June 19-21, 2012.
  61. Ziyan Ren, Dianhai Zhang, Chang Seop Koh, “Reliability Evaluation of the Electromagnetic Device Based on the Second Order Sensitivity Analysis,” ICEF 2012, Dalian, China, June 19-21, 2012.
  62. Heesung Yoon, Minho Song, Pan Seok Shin, Chang Seop Koh, “Accuracy Improved Chua-Vector Hysteresis Model and Its Application to Iron Loss Analysis of Three-Phase Induction Motor”, Compumag2011, Australia, July 12-15, 2011.
  63. Wei Li, Minkyu Seo, Inhyun Kim, Chang Seop Koh, “A Vector Jiles-Atherton Hysteresis Model and Its Application to Finite Element Analysis of Iron Loss”, Compumag2011, Australia, July 12-15, 2011.
  64. Ziyan Ren, Minh-Trien Pham, Chang Seop Koh, “Robust Global Optimization of Electromagnetic Devices with Uncertain Design Parameters : Comparison of Worst-Case Optimization and Gradient Index Method”, Compumag2011, Australia, July 12-15, 2011
  65. Minh-Trien Pham, Wei Li, Chang Seop Koh, “Multi-guiders and Cross-searching Approaches in Multi-objective Particle Swarm Optimization for Electromagnetic Problems”, Compumag2011, Australia, July 12-15, 2011
  66. Dianhai Zhang, Wei Li, Chang Soon Park, Chang Seop Koh, “Optimal Shape Design of Rotor Bar of Three-Phase Squirrel Cage Induction Motor for NEMA Design D Torque-speed Characteristics”, Compumag2011, Australia, July 12-15, 2011
  67. Ziyan Ren, Dianhai Zhang, Chang Seop Koh, “A New Reliability Calculation Algorithm Based on Design Sensitivity Analysis for Reliability-based Optimization in Electromagnetic Devices”, JapMed’7, Hungary, pp.42, July 6-9, 2011
  68. Dianhai Zhang, Minh-Trien Pham, Chang Seop Koh, “Optimal Rotor Slot Design of Three Phase Squirrel Cage Induction Machine for Application on Motor Operated Valve Actuator”, JapMed’7, Hungary, pp.132, July 6-9, 2011
  69. Heesung Yoon, Minho Song, Chang Seop Koh, “Improved E&S Vector Hysteresis Model for Distorted Magnetic Flux Condition and its Implementation to Finite Elementary Method for Iron Loss Analysis of Three-Phase Transformer”, JapMed’7, Hungary, pp.130, July 6-9, 2011
  70. Heesung Yoon, Minho Song, Pan Seok Shin, and Chang Seop Koh, “An Improved Iron Loss Calculation Strategy and its Application to Iron Loss Analysis of a Three-Phase Transformer Model”, ISEF 2011, Portugal, September 1-3, 2011
  71. Zi Yan Ren, Dian Hai Zhang, Minh-Trien Pham, and Chang Seop Koh, “Constraints Reliability-Based Global Optimization of Electromagnetic Devices with Uncertain Design Parameters Based on Sensitivity Analysis”, ISEF 2011, Portugal, September 1-3, 2011
  72. Wei Li, Inhyun Kim, and Chang Seop Koh, ”Hysteresis modeling for electrical steel sheets using Jiles-Atherton vector hysteresis model,” Intermag 2011, Taipei, pp.192, April 25-29,2011
  73. Ziyan Ren, Minh-trien Pham, Wei Li and Chang Seop Koh, “Optimal design of a Thomson-coil actuator utilizing a mixed-integer-discrete-continuous variables global optimization algorithm”, Intermag 2011, Taipei, pp.233, April 25-29, 2011
  74. Yang Liu, Yanli Zhang, Dexin Xie, and Chang Seop Koh, “Analysis of magnetic field in three-phase induction motor core considering two-dimensional vector magnetic properties”, 2010 ICEMS, Incheon, Korea, October 10-13, 2010
  75. Heesung Yoon, Pan Seok Shin, and Chang Seop Koh, “Utilization of extended B-H curve method for consideration of 2-D magnetic properties of non-oriented electrical steels in motors”, 2010 ICEMS, Incheon, Korea, October 10-13, 2010
  76. Wei Li, and Chang Seop Koh, “Design of the thomson-coil actuator of an arc eliminator using adaptive equivalent circuit method”, 2010 ICEMS, Incheon, Korea, October 10-13, 2010
  77. Yanli Zhang, Houjian He, and Chang Seop Koh, “An adaptive response surface method combined with (1+λ) evolution algorithm and its application to optimal design of electromagnetic devices,” Industrial electronics and applications (ICIEA), Taichung, Taiwan, June 15-17, 2010
  78. Yanli Zhang, Jingguo Yuan, Dexin Xie, In Sung Hwang, and Chang Seop Koh, “Shape optimization of a PMLSM using Kriging and genetic algorithm,” Industrial electronics and applications (ICIEA), Taichung, Taiwan, June 15-17, 2010
  79. Heesung Yoon, Inhyun Kim, Pan Seok Shin, and Chang Seop Koh, “Finite element implementation of a Chua-type vector hysteresis model and application to iron Loss analysis of three-phase transformer,” CEFC 2010, Chicago, USA, May 9-12, 2010
  80. Minho Song, Heesung Yoon, Hong-soon Choi, and Chang Seop Koh, “Grid computing and surrogate objective function assisted multi-objective shape optimal design of PMLSM,” CEFC 2010, Chicago, USA, May 9-12, 2010
  81. Minh-Trien Pham, Minho Song ,Dong-Hoon Kim, and Chang Seop Koh, “A robust global optimization algorithm of electromagnetic devices utilizing gradient index and surrogate objective function,” CEFC 2010, Chicago, USA, May 9-12, 2010
  82. Wei Li, Ziyan Ren, Young-woo Jung, and Chang Seop Koh, “Optimal shape design of a Tomson-coil actuator utilizing generalized topology modification based on equivalent circuit method,” CEFC 2010, Chicago, USA, May 9-12, 2010
  83. Ziyan Ren, Minh-Trien Pham, Wei Li, and Chang Seop Koh, “A new global optimization algorithm for mixed-integer-discrete-continuous variables based on particles swarm optimization,” CEFC 2010, Chicago, USA, May 9-12, 2010
  84. Minho Song, Minh-Trien Pham, Heesung Yoon, and Chang Seop Koh, “Utilizing grid computing technique for numerically efficient global optimization of electromagnetic devices,” CEFC 2010, Chicago, USA, May 9-12, 2010
  85. Wei Li and Chang Seop Koh, “Parametric analysis of Thomson-coil actuator using adaptive equivalent circuit method,” CEFC 2010, Chicago, USA, May 9-12, 2010
  86. Heesung Yoon, Chang Soon Park, and Chang Seop Koh, “Finite element analysis of iron loss estimation of 3MVA three-phase transformer utilizing generalized Chua-type vector hysteresis model,” CEFC 2010, Chicago, USA, May 9-12, 2010
  87. Minho Song, Heesung Yoon, Pan Seok Shin, and Chang Seop Koh, “A generalized Chua-type vector hysteresis model for both the non-oriented and grain-oriented electrical steel sheets,” CEFC 2010, Chicago, USA, May 9-12, 2010
  88. Yanli Zhang, Xiaona Li, Dexin Xie, and Chang Seop Koh, “ Finite element calculation in transformer cores considering anisotropic magnet property under distorted rotational magnetic flux condition,” CEFC 2010, Chicago, USA, May 9-12, 2010
  89. Yanli Zhang, Bing Yan, Dexin Xie, and Chang Seop Koh, “An adaptive optimization method using Kriging model and latin hypercube design its application to optimum design of PMLSM,” CEFC 2010, Chicago, USA, May 9-12, 2010
  90. YoungBae Kim, Hyeong Taek Jang, 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,” CEFC 2010, Chicago, USA, May 9-12, 2010
  91. Pan Seok Shin, Hee Jun Cheung, Hyun Koo Chung, and Chang Seop Koh, “A magnetostrictive force analysis of large scale motor by a strong magneto-mechanical coupling formulation,” 11th Joint MMM/Intermag Conference, Washington DC, USA, January 18-22, 2010
  92. Wei Li and Chang Seop Koh, “An adaptive equivalent circuit modeling method for eddy current driven electromechanical system,” 11th Joint MMM/Intermag Conference, Washington DC, USA, January 18-22, 2010
  93. Yanli Zhang, Chunmiao Xu, Dexin Xie, Hee Sung Yoon, and Chang Seop Koh, “Analysis of magnetic characteristic in the three-phase transformer core considering two-dimensional magnetic anisotropic property,” ICEMS 2009, Tokyo, Japan, November 15-18, 2009
  94. Yanli Zhang, Jingguo Yuan, Dexin Xie, and Chang Seop Koh, “An improved reluctivity model for vector magnetic properties of silicon steels under distorted magnetic flux density,” COMPUMAG2009, Brazil, November 22-26, 2009
  95. Chang Seop Koh, Hyo Jun Kim, and Hee Sung Yoon, “A new anisotropic bonded NdFeB permanent magnet and its application to a small DC motor,” COMPUMAG2009, Brazil, November 22-26, 2009
  96. Hee Sung Yoon, Nyambayar Baatar, Hong-soon Choi, and Chang Seop Koh, “Multi-objective shape optimal design of PMLSM utilizing response surface method and grid computing,” COMPUMAG2009, Brazil, November 22-26, 2009
  97. Sun-Ki Hong and Chang Seop Koh, “A study for harmonic iron loss for electrical steel under alternating magnetic field,” COMPUMAG2009, Brazil, November 22-26, 2009
  98. Wei Li, Jiang Lu, and Chang Seop Koh, “An adaptive equivalent circuit method for TEAM Problem 28: An electrodynamic levitation device,” COMPUMAG2009, Brazil, November 22-26, 2009
  99. Wei Li, Jiang Lu, Young Woo Jeong, and Chang Seop Koh, “Shape optimization of a thomson-coil actuator for fast response using topology modification,” COMPUMAG2009, Brazil, November 22-26, 2009
  100. Pan Seok Shin, Hee Jun Cheong, Sung Hyun Woo, and Chang Seop Koh, “Magnetic forces and displacement analysis of large scale BLDC motor by magneto-mechanical formulation,” COMPUMAG2009, Brazil, November 22-26, 2009
  101. Hee Sung Yoon, Pan-seok Shin, and Chang Seop Koh, “An extended B-H curve modeling of 2D magnetic properties of silicon steel and its influences on motor performances,” COMPUMAG2009, Brazil, November 22-26, 2009
  102. Hee Sung Yoon, Sun-ki Hong, and Chang Seop Koh, “A new 2D magnetic reluctivity model for rotating magnetic fields and its application to FEM,” COMPUMAG2009, Brazil, November 22-26, 2009
  103. Minh-Trien Pham, Nyambayar Baatar, and Chang Seop Koh, “Coupling particles swarm optimization for multimodal function optimization,” COMPUMAG2009, Brazil, November 22-26, 2009
  104. Hee Sung Yoon, Pan-Seok Shin, Koji Fujiwara, and Chang Seop Koh, “Finite element analysis of a very large-scale permanent magnet BLDC motor considering two-dimensional magnetic properties of electrical steels,” INTELEC2009, Incheon, KOREA, October 18-22, 2009
  105. Nyambayar Baatar, Hee Sung Yoon, In Hyun Kim, and Chang Seop Koh, “Shape optimization of a 9 pole 10 slot structure PMLSM for detent force reduction using response surface method,” LDIA2009, Incheon, Korea, September 20-23, 2009
  106. Hee Sung Yoon, Min Ho Song, and Chang Seop Koh, “Optimal shape design of a single phase AC solenoid actuator using multi-objective optimization with response surface method,” LDIA2009, Incheon, Korea, September 20-23, 2009
  107. Wei Li, Jiang Lu, Young Woo Jeong, and Chang Seop Koh, “Analysis of parameters influence on the characteristics of Thomson coil arc eliminator using equivalent circuit method,” LDIA2009, Incheon, Korea, September 20-23, 2009
  108. Nyambayar Baatar, Hee Sung Yoon, 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,” INTERMAG2009, Sacramento, USA, May 4-8, 2009
  109. Pan-Seok Shin, Hee Jun Chung, Sung Hyun Woo, and Chang Seop Koh, “An optimal design of permanent magnet pole shape for a BLDC motor by using latin hypercube sampling strategy,” INTERMAG2009, Sacramento, USA, May 4-8, 2009
  110. Wei Li, Young Woo Jeong, and Chang Seop Koh, “A fast solving technique for dynamic characteristic analysis of electromagnetic repulsive system,” ICEMS2008, Wuhan, China, October, 17-20, 2008
  111. Yanli Zhang, Dexin Xie, Baodong Bai, and Chang Seop Koh, “An improved magnetic property modeling for electrical steel sheets based on double-exciting type 2D measuring system,” ICEMS2008, Wuhan, China, October, 17-20, 2008
  112. Yanli Zhang, Young Whan Eum, Chang Seop Koh, and Dexin Xie, “An improved engineering model of vector magnetic properties of grain-oriented electrical steels,” INTERMAG2008, Madrid, Spain, May 4-8, 2008
  113. Chang Seop Koh, In Sung Hwang, and Hee Sung Yoon, “A new PMLSM having 9 pole 10 slot structure and its shape optimal design for detent force reduction,” INTERMAG2008, Madrid, Spain, May 4-8, 2008
  114. Pan-Seok Shin, Sung Hyun Woo, Yanli Zhang, and Chang Seop Koh, “An application of the Latin hypercube sampling strategy for optimal design of large scale permanent magnet pole using adaptive response surface method,” INTERMAG2008, Madrid, Spain, May 4-8, 2008
  115. Hee Sung Yoon, Yanli Zhang, Pan-Seok Shin, and Chang Seop Koh, “Comparison of magnetic reluctivity models for finite element analysis considering two-dimensional magnetic properties,” CEFC2008, Athens, Greece, May 11-15, 2008
  116. Hee Sung Yoon, Minh-Trien Pham, Yanli Zhang, and Chang Seop Koh, “An optimum sampling strategy for efficient global optimum design of electromagnetic devices using response surface method,” CEFC2008, Athens, Greece, May 11-15, 2008
  117. 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,” CEFC2008, Athens, Greece, May 11-15, 2008
  118. Pan Seok Shin, Sung Hyun Woo, Yanli Zhang, and Chang Seop Koh, "An optimal design of large scale permanent magnet pole shape using adaptive response surface method with latin hypercube sampling strategy," CEFC2008, Athens, Greece, May 11-15, 2008
  119. Yani Zhang, Hee Sung Yoon, Chang Seop Koh, Dexin Xie, “An Adaptive Response Surface Method Combined with Experiment Design Strategy and its Application to optimal Design of Electromagnetic Devices,” APCOM’07, International Conference, Kyoto Japan, Dec. 3-6, 2007
  120. In Sung Hwang, Hee Sung Yoon, Chang Seop Koh, “ A Computationally Efficient Shape Optimization of a Short-Primary PMLSM for Detent Force Reduction Using RSM Coupled with Finite Element Method,” APCOM’07, International Conference, Kyoto Japan, Dec. 3-6, 2007
  121. Yani Zhang, Hee Sung Yoon, Chang Seop Koh, Dexin Xie, “Global Optimization of Electromagnetic Devices combining Latin Hypercube Sampling Experiment and adaptive Response Surface Method,” ICEMS2007, International Conference on Electrical Machine and Systems, Seoul Korea, pp. 1414-1418, Oct. 8-11, 2007
  122. Hee Sung Yoon, Yanli Zhang, Pan-Seok Shin, Chang Seop Koh,,“A Robust Optimal Design Method of Electromagnetic Devices using Genetic Algorithm Coupled with Adaptive Response Surface Method,” COMPUMAG2007, The 16th conference on the computation of electromagnetic fields,Aachen, Germany, June 24-28, 2007
  123. In Sung Hwang, Sung Whan Youn, Sun-Ki Hong, Chang Seop Koh, “Shape Optimization of a PMLSM having 9 Pole 10 Slot Structure for Detent Force Reduction,” COMPUMAG2007, The 16th conference on the computation of electromagnetic fields,Aachen, Germany, June 24-28, 2007
  124. Yani 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,” COMPUMAG2007, The 16th conference on the computation of electromagnetic fields,Aachen, Germany, June 24-28, 2007
  125. Hee Sung Yoon, In Sung Hwang, Sonam Yoon, Chang Seop Koh, “Optimal Design of a Single Phase AC Solenoid Valve for Minimization df Force Pulsation using Adaptive Response Surface Method ,”COMPUMAG2007, The 16th conference on the computation of electromagnetic fields,Aachen, Germany, June 24-28, 2007
  126. Yanli Zhang, Dexin Xie, Baodong Bai, Hee Sung Yoon , Chang Seop Koh, “A Novel Optimal Design Method of Passive shimming for a Permanent MRI Magnet,” COMPUMAG2007, The 16th conference on the computation of electromagnetic fields, Aachen, Germany, June 24-28, 2007
  127. Yingying Yao, Chang Seop Koh, “A Computationally Efficient Finite Element Analysis Algorithm Considering Two-Dimensional Magnetic Properties,” COMPUMAG2007, The 16th conference on the computation of electromagnetic fields,Aachen, Germany, June 24-28, 2007
  128. Yong Kwon Choi, Hee Sung Yoon, and Chang Seop Koh, “Shape Optimization of a High Speed Switched Reluctance Motor to Minimize Torque Ripple Using Response Surface Methodology,” ICEMS2006, International Conference on Electrical Machine and Systems, Nagasaki Japan, Nov. 20-23, 2006
  129. Young Hwan Eum, Sun-Ki Hong, Pan-Seok Shin, and Chang Seop Koh, “Measurement of the Two Dimensional Magnetic Properties of Electrical Steel Sheets under Rotating Magnetic Fields,” ICEMS2006, International Conference on Electrical Machine and Systems, Nagasaki Japan, Nov. 20-23, 2006
  130. Sung Whan Youn, Jong Jin Lee, and Chang Seop Koh, “A New Cogging Free Permanent Magnet Linear Motor having 3 Phase 9 Pole 10 Slot Structure,” ICEMS2006, International Conference on Electrical Machine and Systems, Nagasaki Japan, Nov. 20-23, 2006
  131. C.S Koh, S.G Hong, P.S Shin, “An Efficient Identification Algorithm of the Preisach Model from B-H curve using Optimization Algorithm,” INTERMAG2006, IEEE International Magnetics Conference, San Diego, California, May 8-12,2006
  132. H.J Kim, C.S Koh, D. Kim, G. Kang, “Application of Polar Anisotropic Sintered NdFeB Ring-type Permanent Magnet to Brushless DC Motor,” INTERMAG2006, IEEE International Magnetics Conference, San Diego, California, May 8-12,2006
  133. Yong Kwon Choi, and Chang Seop Koh, “Pole Shape Optimization of Switched Reluctance Motor for Reduction of Torque Ripple,” CEFC2006, 12th biennial conference on electromagnetic field computation, Miami, Florida, USA, pp. 332, April30-May3, 2006
  134. Pan-seok Shin, Han-Deul Kim, Chang Seop Koh, Gwan-soo Park, “Magnet Pole Shape Optimization For Large Scale BLDC Motor by Using Response Surface Method,” CEFC2006, 12th biennial conference on electromagnetic field computation, Miami, Florida, USA, pp. 298, April30-May3, 2006
  135. J.G Lee, J.H Lee, J.S Ryu, Y.K Kim, Y.J Shin and C.S Koh, Senior Member, IEEE, “An Optimal Design of Solid Insulated Vacuum Interrupter using Response Surface Method,” CEFC2006, 12th biennial conference on electromagnetic field computation, Miami, Florida, USA, pp. 139, April30-May3, 2006
  136. Chang Seop Koh, Senior Member, IEEE, Young Hwan Eum, Sun-ki Hong, Pan-seok Shin, “Comparison of the Identification Methods of Preisach Model For a Grain-Oriented Electrical Steel Sheet,” CEFC2006, 12th biennial conference on electromagnetic field computation, Miami, Florida, USA, pp. 97, April30-May3, 2006
  137. Yingying Yao, and Chang Seop Koh, Senior Member, IEEE, “A Computationally Efficient Finite Element Analysis Algorithm Considering Two-Dimensional Magnetic Properties,” CEFC2006, 12th biennial conference on electromagnetic field computation, Miami, Florida, USA, pp. 91, April30-May3, 2006
  138. Yingying Yao, and Chang Seop Koh, Senior Member, IEEE, “A Global Optimization Algorithm Based on C Piecewise Response Surface Patches,” CEFC2006, 12th biennial conference on electromagnetic field computation, Miami, Florida, USA, pp. 57, April30-May3, 2006
  139. J.S.Ryu, and Y.Yao and C.S.Koh, “3D optimal shape design of pole piece in permanent magnet MRI using parameterized nonlinear design sensitivity analysis,” COMPUMAG, The 15th conference on the computation of electromagnetic fields, Shenyang, China, vol. 1, pp 96-97, June26-30, 2005
  140. S.K.Hong, C.S.Koh, “Improved method of determining the Preisach density function using Lorentzian and Gaussian function with genetic algorithm,” COMPUMAG, The 15th conference on the computation of electromagnetic fields, Shenyang, China, vol. 2, pp 38-39, June26-30, 2005
  141. C.S.Koh, J.S.Ryu and K.Fujiwara, “Convergence acceleration of the Newton-Raphson method using successive quadratic function approximation of residual,” COMPUMAG, The 15th conference on the computation of electromagnetic fields, Shenyang, China, vol. 2, pp 76-77, June26-30, 2005
  142. Y.Yao, Y.Fang and C.S.Koh, “A direct coupled field-circuit-movement finite element method for modeling EMS-MAGLEV system,” COMPUMAG, The 15th conference on the computation of electromagnetic fields, Shenyang, China, vol. 3, pp 160-161, June26-30, 2005
  143. Y.Yao, S.Yang and C.S.Koh, “Utilizing design sensitivity analysis for the global optimization of electromagnetic devices with C piecewise response surface patches,” COMPUMAG, The 15th conference on the computation of electromagnetic fields, Shenyang, China, vol. 3, pp 180-181, June26-30, 2005
  144. I.K.Kim and C.S.Koh, “A spherical permanent magnet motor without winding-overhang,” COMPUMAG, The 15th conference on the computation of electromagnetic fields, Shenyang, China, vol. 4, pp 16-17, June26-30, 2005
  145. J.S.Ryu, and C.S.Koh, ”Parameterized sensitivity analysis for shape optimization of magnetic pole in permanent magnet type MRI device,” ICEMS2004, International Conference on Electrical Machine and Systems, Jeju, Korea, PC-36, Oct. 31 – Nov. 3, 2004
  146. J.S.Ryu, Y.Yao and C.S.Koh, “Optimal shape design of 3D nonlinear electromagnetic devices using parameterized design sensitivity analysis,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 34, June6-9, 2004
  147. Y.Yao, C.S.Koh, G. Ni and D. Xie, “On-line calculation of eddy current in power transformers under DC bias,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 43, Jun6-9, 2004
  148. Y.Yao, G.Ni, C.S.Koh and Y. fang, “The design method of completely open architecture permanent magnet for MRI,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 88, June6-9, 2004
  149. S.K.Hong and C.S.Koh, “Determination of the distribution of the Presich density function with optimization algorithm,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 93, June6-9, 2004
  150. J.S.Ryu and C.S.Koh, “ An adaptive mesh refinement for precise force calculation in 3D finite element method,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 117, June6-9, 2004
  151. J.S.Ryu, C.S.Koh and P.S.Shin,” Magnetic pole shape optimization of permanent MRI magnet using non-linear parameterized sensitivity analysis,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 372, June6-9, 2004
  152. J.S.Ryu, M.R.Seo, C.S.Koh, S.Yoon and D.S.Kim,” Optimal design of constant force solenoid for pressure control using axisymmetric nonlinear parameterized sensitivity analysis,” CEFC2004, 11th biennial conference on electromagnetic field computation, Seoul, Korea, pp. 390, June6-9, 2004
  153. C. S. Koh, J. S. Ryu, S. K. Hong, “Optimum shape design of magnetizing yoke of 2 pole PM motor for cogging torque reduction,” ISEF 2003-11th International Symposium on Electromagnetic Fields in Electrical Engineering, Maribor, Slovenia, Sep. 18-20, pp.665-670, 2003
  154. S. K. Hong, C. S. Koh, P. S. Shin, “Determination of the distribution of the Everett function using genetic algorithm,” ISEF 2003-11th International Symposium on Electromagnetic Fields in Electrical Engineering, Maribor, Slovenia, Sep. 18-20, pp.643-646, 2003
  155. P. S. Shin, C. S. Koh, P. J. Otaduy, “Cogging torque reduction of an magnet embedded BLDC motor using advanced evolution strategy,” ISEF 2003-11th International Symposium on Electromagnetic Fields in Electrical Engineering, Maribor, Slovenia, Sep. 18-20, pp.585-590, 2003
  156. Y. Yao, J. S. Ryu, C. S. Koh, D. Xie, P. S. Shin, “3D shape optimization of eddy current problems using deisgn sensitivity analysis,” ISEF 2003-11th International Symposium on Electromagnetic Fields in Electrical Engineering, Maribor, Slovenia, Sep. 18-20, pp.553-558, 2003
  157. Y. Yao, C. S. Koh, G. Ni, S. yang, D. Xie, “The optimal shape design of passive shimming element for high homogeneous permanent magnets sensitivity analysis,” ISEF 2003-11th International Symposium on Electromagnetic Fields in Electrical Engineering, Maribor, Slovenia, Sep. 18-20, pp.547-552, 2003
  158. Yingying Yao, Chang Seop Koh*, and Dexin Xie, “A Novel Mesh Regeneration Using Structural Deformation Analysis for 3D Shape Optimization of Electromagnetic Devices,” Record of the 14th COMPUMAG Conference on the Computation of Electromagnetic Fields, sagatoga, USA, July 2-5, 2003
  159. Yingying Yao, Chang Seop Koh*, Dexin Xie,” 3D Optimal Shape Design of Magnetic Pole in Permanent Magnet Assembly for MRI Taking Account of Gradient Coil Field,” Record of the 14th COMPUMAG Conference on the Computation of Electromagnetic Fields, sagatoga, USA, July 2-5, 2003
  160. Yingying Yao, Jae Seop Ryu*, Chang Seop Koh*, Dexin Xie, “Robust 3D Shape Optimization of Electromagnetic Devices by Combining Sensitivity Analysis and Adaptive Spline,” Record of the 14th COMPUMAG Conference on the Computation of Electromagnetic Fields, sagatoga, USA, July 2-5, 2003
  161. Chang seop Koh; Byung-Kil Kang; Sung-Soo Kang; In-Koo Kim; "Optimum Design of 2 Pole Permanent Magnet Motor for Cogging Torque Reduction," IEEE CEFC2002, Perugia, Italy, The 10'th IEEE Conference on Electromagnetic Field Computation, June 16-19, 2002, pp.59
  162. Yingying. Yao; Chang seop. Koh; Xie Dexin, "3D Shape Optimization of Electromagnetic Devices Including Eddy Currents by Using Design Sensitivity Analysis," IEEE CEFC2002, Perugia, Italy, The 10'th IEEE Conference on Electromagnetic Field Computation, June 16-19, 2002, pp.292
  163. Jae Seop Ryu; Yan Xiuke; Chang Seop Koh; Dexin, M.; Song-Yop Hahn, 3d adaptive finite element method with edge elements, Electrical Machines and Systems, 2001. ICEMS 2001. Proceedings of the Fifth International Conference on , Volume 2, Page(s): 1174 -1177, Shenyang, China, August 18-20, 2001
  164. Chang Seop Koh; Byung-Kill Kang, Jae-Seop Ryu; and Jin-Soo Seol, The Effects of the Distribution of Remnant Magnetization on the Cogging Torque and Switching Signals in Permanent Magnet Motors, Record of the 13th COMPUMAG Conference on the Computation of Electromagnetic Fields, Volume II, Page(s): PC2-17, Evian France, July 2-5, 2001
  165. Chang Seop Koh; Jae-Seop Ryu; and Eung-Soo Shin, Finite Element Analysis of the Mechanical Vibration of a Spindle System Under Electro- magnetic Excitations. Record of the 13th COMPUMAG Conference on the Computation of Electromagnetic Fields, Volume IV, Page(s): PG2-13, Evian France, July 2-5, 2001
  166. Seung-young Hahn, Woo-seok Kim, Chang Seop Koh; and Song-yop Hahn, 3D Finite Element Analysis of Hysteresis Loss in a Superconduction Bulk Magnet. Record of the 13th COMPUMAG Conference on the Computation of Electromagnetic Fields, Volume III, Page(s): PE2-11, Evian France, July 2-5, 2001
  167. C.S.Koh, and J.S.Ryu, "Magnetization analysis of the Isotropic permanent magnet using vector hysteresis model," IEEE CEFC2000, Milwaukee, Wisconsin, USA, The 9'th IEEE Conference on Electromagnetic Field Computation, June 4-7, 2000, pp.422
  168. C.S.Koh, "Identification of distribution function of the Preisach model using Inverse algorithm," IEEE CEFC2000, Milwaukee, Wisconsin, USA, The 9'th IEEE Conference on Electromagnetic Field Computation, June 4-7, 2000, pp.417
  169. C.S.Koh, and J.S.Seol, "Optimum shape design of permanent magnet motor for reduction of cogging torque," IEEE CEFC2000, Milwaukee, Wisconsin, USA, The 9'th IEEE Conference on Electromagnetic Field Computation, June 4-7, 2000, pp.345
  170. Chang Seop Koh; Song-Yop Hahn; Gwan-Soo Park , Vector hysteresis modeling by combining stoner-Wohlfarth and Preisach models, the 12th COMPUMAG Conference on the Computation of Electromagnetic Fields, Volume II, Page(s): 802-803, Sapporo, Japan, October 25-28, 1999
  171. Chang Seop Koh , Magnetization Analysis of the Permanent Magnet Using Vector Hysteresis Model, the 12th COMPUMAG Conference on the Computation of Electromagnetic Fields, Volume II, Page(s): 818-819, Sapporo, Japan, October 25-28, 1999
  172. Chang Seop Koh; Kwang-Sig Jung; Song-Yop Hahn, A Design of Eddy Current Controller in Electron Gun using 3D Boundary Element Method, the 12th COMPUMAG Conference on the Computation of Electromagnetic Fields, Volume II, Page(s): 854-855, Sapporo, Japan, October 25-28, 1999
  173. Jung-Kyun Cho; Chang-Hwan Lee; Hyun-Kyo Jung; Young-Woo Ahn; Song-Yop Hahn; Chang-Seop Koh, Multiresolution analysis for permeability reconstruction using wavelet, Magnetics Conference, 1999. Digest of INTERMAG 99. 1999 IEEE International , 1999, Page(s): EQ18
  174. G. S. Jung, S. Y. Hahn and C. S. Koh, A Transient magnetic field analysis of electron gun in Cathod Ray Tube using boundary element method, ICEE 98, July 21-25, 1998, Kyongju, KOREA, Vol.I, pp.87-90
  175. C. S. Koh, J. S. Ryu, J. S. Seol, and H. S. Yoon, A finite element analysis of magnetization of the anisotropic permanent magnet using magnetization dependent Preisach model, ICEE 98, July 21-25, 1998, Kyongju Korea, Vol. I, pp.701-704
  176. C. S. Koh and S. K. Hong, Finite element analysis of Magnetizer using Preisach Model, IEEE CEFC98, Tucson, Arizona, USA, The Eight IEEE Conference on Electromagnetic Field Computation, June 1-3, 1998, pp.187
  177. D. J. Bae, C. S. Koh, H. K. Jung and S. Y. Hahn, Design of high efficiency three phase induction motor using neural networks trained from FEM results, IEEE Compumag97 Rio de Janeiro, The 11th Conference on computation of electromagnetic fields, November 3-6, PP.717, 1997, ,
  178. D. J. Bae, C. S. Koh, H. K. Jung, and S. Y. Hahn, Calculation of cage induction motor parameters using artificial neural network based FEM results, The international ISEM symposium on Non-Linear Electromagnetic Systems, Cardiff, UK, September 17-20, 1995
  179. M. K. Kim, H. K. Jung, C. S. Koh, B. S. Suh, and S. Y. Hahn, Sensitivity analysis for electric resistivity tomography, The international ISEM symposium on Non-Linear Electromagnetic Systems, Cardiff, UK, September 17-20, 1995
  180. C. S. Koh, X. Dexin, F. Uler and Osama A. Mohammed, T-Ω Finite element analysis of 3D nonlinear transient eddy current problems, The international ISEM symposium on advanced design technologies, Seoul, Korea, pp. 131, June 22-24, 1994
  181. C. S. Koh, F. Uler and Osama A. Mohammed, Genetic algorithms applied to design optimization,  The international ISEM symposium on advanced design technologies, Seoul, Korea, pp.114, June 22-24, 1994
  182. C. S. Koh, S. Y. Hahn, H. K. Jung and Osama A. Mohammed, The application of artificial neural network to defect characterization in eddy current NDT, The international ISEM symposium on advanced design technologies, Seoul, Korea, pp.84, June 22-24, 1994
  183. C. S. Koh, S. Y. Hahn and Osama A. Mohammed, Design optimization of electromagnetic devices using shape design sensitivity analysis, IEEE SOUTHEASTCON '94, April 10-13, 1994, Miami, Florida, USA
  184. C. S. Koh, J. O. Kim, H. B. Lee, S. Y. Hahn and H. K. Jung, Optimal Design of VCM with Constant Torque Coefficients, The First Pan-Pacific Conference on Computational Engineering, p.461-464, Seoul Korea, November 1-5, 1993
  185. K. R. Hong, C. S. Koh, H. K. Jung, D. K. Jung and S. Y. Hahn, A 3-Dimensional Approach for Aperture Design of Electron Gun, The First Asian Symposium on Information Display, pp.31-34, Taiwan , Rep. of China, October 27-29, 1993
  186. C. S. Koh, K. R. Hong, S. Y. Hahn and H. K. Jung, Optimum shape design of electron lens using evolution strategy, Simulation and design of applied electromagnetic systems, pp.29-32, Elsevier, --The Proceeding of the international ISEM symposium on simulation and design of applied electromagnetic systems, Sapporo, Japan, January 26-30, 1993
  187. K. R. Hong, M. Y. Choi, C. S. Koh, S.Y. Hahn and H. K. Jung, Computer Aided Design of Magnetic Deflection System, 3-rd Japan-Korea Joint Symposium on Information Display, pp. 149-155, Seoul Korea, October 19-20, 1992
  188. C. S. Koh, S. Y. Hahn and H. K. Jung, Optimum shape design of electrostatic devices using Design sensitivity analysis, Electromagnetic Field Problems and Applications, pp. 171-174, 1992, International Academic Publishers, - The Proceeding of International Conference on Electromagnetic Field Problems and Applications, Hangzhou, China, October 1992
  189. C. S. Koh, S. Y. Hahn, H. K. Jung and K. S. Lee, A posterior error estimate for adaptive boundary element method, IEEE COMPUMAG conference on the computation of electromagnetic fields, Sorrento, Italy, pp. 99-102, July 1991
  190. C. S. Koh, K. R. Hong, K. W. Kim, S. Y. Hahn and H. K. Jung, A sensitivity analysis for optimum coil design in magnetic deflection systems, Korea-Japan Joint Symposium on Information Display, pp. 111-114, Seoul Korea, October 29-30, 1990
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