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Journal Papers

  1. Y. Hu, S.-Y. Choe and T.R. Garrick, “Hybridized time-frequency method for the measurement of entropy coefficient of lithium-ion battery,” Electrochimica Acta, Vol. 362, https://doi.org/10.1016/j.electacta.2020.137124, 2020.

  2. M.-S. Song, Y. Hu, S.-Y. Choe and T. R. Garrick, “Analysis of the Heat Generation Rate of Lithium-Ion Battery Using an Electrochemical Thermal Model,” J. of Electrochem. Soc., Vol. 167, Nr. 12, 2020

  3. Y.-L Bi and S.-Y.Choe, “Online state of health and aging parameter estimation using a physics-based life model with a particle filter,” Journal of Power Sources, https://doi.org/10.1016/j.jpowsour.2020.228655, Vol. 476, 2020.

  4. Y.-L Yin, S.-Y. Choe, “Actively temperature controlled health-aware fast charging method for lithium-ion battery using nonlinear model predictive control, ” Applied Energy, Vol.271, Aug, 2020

  5. Y.Hu, Y. Bi, Y.-L Yin and S.-Y. Choe, “A control oriented reduced order electrochemical model considering variable diffusivity of lithium ions in solid,” Journal of Power Sources,2020

  6. Y.-L Bi* and S.-Y.Choe, "An adaptive sigma-point Kalman filter with state equality constraints for online state-of-charge estimation of a Li(NiMnCo)O2/Carbon battery using a reduced-order electrochemical model," Applied Energy, 2019

  7. M.-S. Song* and S.-Y. Choe, "Fast and safe charging method suppressing side reaction and lithium deposition reaction in lithium ion battery," Journal of Power Sources, 2019.

  8. Y. Yin*, Y. Hu*, S.-Y. Choe, H. Cho and W.-T. Joe, "New Fast Charging Method of Lithium-Ion Batteries Based on a Reduced Order Electrochemical Model Considering Side Reaction," Journal of Power Sources, Vol. 423, pp. 367-379, 2019

  9. X. Zhao*, Y. Yin*, Y. Hu* and S.-Y. Choe, "Electrochemical-thermal modeling of lithium plating/stripping of Li(Ni0.6Mn0.2Co0.2)O2/Carbon lithium-ion batteries at subzero ambient temperatures," Journal of Power Sources, Vol. 418, pp. 61-73, 2019

  10. X. Zhao*, Y. Bi*, S.-Y. Choe and S.-Y Kim, "An Integrated Reduced Order Model Considering Degradation Effects for LiFePO4/Graphite Cells," Electrochimica Acta, Vol.280, pp.41-54, 2018

  11. Y. Zhao*, S.-Y. Choe and J. Kee, "Modeling of degradation effects and its integration into electrochemical reduced order model for Li(MnNiCo)O2/Graphite polymer battery for real time applications," Electrochimica Acta, Vol 270, pp.440-452, 2018.

  12. X. Zhao*, Y. Bi*, and S.-Y. Choe, "Development and Validation of a Reduced Order Model Incorporating a Semi-Empirical Degradation Model for Pouch Type LiFePO4/Graphite Cells," SAE International Journal of Alternative Powertrains 6, no. 2017-01-1218, pp. 279-289, 2017

  13. Y.L. Yin*, Z. Zheng* and S.-Y. Choe, "Design of a Calorimeter for Measurement of Heat Generation Rate of Lithium Ion Battery Using Thermoelectric Device," SAE International Journal of Alternative Powertrains 6, no. 2017-01-1213, pp.252-260, 2017.

  14. X. Li*, S.-Y. Choe and W.T. Joe, "A reduced order electrochemical and thermal model for a pouch type lithium ion polymer battery with LiNixMnyCo1-x-y O2/LiFePO4 blended cathode," Journal of Power sources, Vol. 294, pp 545-555, 2015.

  15. Y. Zhao* and S.-Y. Choe, "A highly efficient reduced order electrochemical model for a large format LiMn2O4/Carbon polymer battery for real time applications," Electrochimica Acta, Vol. 164, 2015, pp. 97-107.

  16. R. Fu*, S.-Y. Choe, V. Agubra* and J. W. Fergus, "Development of a physics-based degradation model for lithium ion polymer batteries considering side reactions," Journal of Power Sources, Vol. 278, 2015, pp. 506-521.

  17. X. Li*, M. Xiao*, S.-Y. Choe and W.T. Joe, "Modeling and analysis of LiFePO4/Carbon battery considering two-phase transition during galvanostatic charging/discharging," Electrochimica Acta, Vol. 155, 2015, pp. 447-457.

  18. M. Xiao* and S.-Y. Choe, "Impedance model of lithium ion polymer battery considering temperature effects based on electrochemical principle: Part I for high frequency," Journal of Power Sources, Vol. 277, 2015, pp. 403-415.

  19. V. A. Agubra*, J.W. Fergus, R. Fu*, and S.-Y. Choe, "Analysis of the Deposit Layer from Electrolyte Side Reaction on the Anode of the Pouch Type Lithium Ion Polymer Batteries: The Effect of State of Charge and Charge Rate," Electrochimica Acta, Vol.149, 2014, pp. 1-10.

  20. V. A. Agubra*, J.W. Fergus, R. Fu*, and S.-Y. Choe, "Analysis of effects of the state of charge on the formation and growth of the deposit layer on graphite electrode of pouch type lithium ion polymer batteries," Journal of Power Sources, Vol. 270, 2014, pp. 213-220.

  21. R. Fu*, S.-Y. Choe, V. Agubra* and J. W. Fergus, "Electrochemical Thermal Model of a Pouch Type NMC/Carbon Li-ion Battery Considering Degradation Effects of Side Reactions," Journal of Power Sources, Vol.261, 2014, pp. 120-135. (40%)

  22. M. Xiao* and S.-Y. Choe, "Theoretical and experimental analysis of heat generations of a pouch type LiMn2O4/carbon high power Li-polymer," Journal of Power Sources, Vol.241, 2013, pp. 56-55. (50%)

  23. X. Li* and S.-Y. Choe, "Reduced Order Model (ROM) of a Pouch Type Lithium Polymer Battery based on Electrochemical Thermal Principles for Real time Applications," Electrochimica Acta, Vol. 97, 2013, pp. 66-78. (50%)

  24. R. Fu*, M. Xiao* and S.-Y. Choe, "Modeling, Validation and Analysis of Mechanical Stress Generation and Dimension Changes of a Pouch Type High Power Li-ion Battery," Journal of Power Sources, Vol.224, 2013, pp.211-224. (50%)

  25. S.-K. Park, S.-Y. Choe, T. -W. Lim; J. -S. Kim; D. -H. Seo, and J. H. Choi, " Analysis of a shell-and-tube type gas-to-gas membrane humidifier for an automotive polymer electrolyte membrane fuel cell power system," International Journal of Automotive Technology, Vol. 14-3, 2013, pp. 449–457.

  26. S.-Y. Choe, X. Li and M. Xiao. "Fast Charging Method Based on Estimation of Ion Concentrations using a Reduced Order of Electrochemical Thermal Model for Lithium Ion Polymer Battery," World Electric Vehicle Journal Vol. 6 , pp.782-792, 2013

  27. M. Xiao* and S.-Y. Choe, "Dynamic modeling and analysis of a pouch type LiMn2O4 /Carbon high power Li-polymer battery based on electrochemical-thermal principles," Journal of Power Sources, Vol. 218, 2012, pp. 357-367. (50%)

  28. R. Fu*, S.-Y. Choe, R. L. Jackson, G. T. Flowers, and D. Kim, "Modeling and analysis of vibration induced changes in connector resistance of high power electrical connectors for Hybrid Vehicles," Journal of Mechanics-based Design of Structures and Machines, Vol. 40, Issue 3, 2012, pp. 349-365. (60%)

  29. S. V. Angadi*, R. L. Jackson, S.-Y. Choe, G. T. Flowers, Bong-Yi Lee, Liang Zhong, "A Multi-physics Finite Element Model of a 35A Automotive Connector including Multiscale Rough Surface Contact," ASME Journal of Electronic Packaging, Vol. 134, Issue 1, 2012. http://dx.doi.org/10.1115/1.4005955. (30%)

  30. R. Fu*, S.-Y. Choe, R. L. Jackson, G. T. Flowers, M. J. Bozack, L. Z. and D. Kim, "Vibration induced changes in the contact resistance of high power electrical connectors for hybrid vehicles," IEEE Trans. Components and Packaging and Manufacturing Technology, Vol. 2, Issue 2, 2012, pp. 185-193. (50%)

  31. J. He*, J.-W Ahn*, S.-Y. Choe, "Analysis and control of a fuel delivery system based on a two-phase anode model of the PEM fuel cell stack," Journal of Power Sources, Vol. 196, 2011, pp. 4655-4670. (50%).

  32. K. Siniard*, M. Xiao*, S.-Y. Choe, "One dimensional dynamic modeling and validation of maintenance-free lead-acid batteries emphasizing temperature effects," Journal of Power Sources, Vol.195, 2010, pp. 7102-7114. (60%)

  33. D.H Shen*, J.-H. Park*, J.-H. Noh, S.-Y. Choe, S.- H. Kim, H.- C Wikle III, D.-J. Kim, "Micromachined PZT cantilever based on SOI structure for low frequency vibration energy harvesting," Sensors & Actuators A, Physical, Vol. 154-1, 2009, pp. 103-108. (20%)

  34. J. Ajitsaria*, S.-Y. Choe, P. Ozmun, D. Shen, and D. J. Kim, "Modeling and Analysis of a bimorph PZT cantilever beam based micro-power generator," Sensor and Transducers Journal, Vol.105-6, June, 2009, pp. 81-93. (60%)

  35. S.-K. Park and S.-Y. Choe, "Modeling and experimental analyses of a two-cell PEM fuel cell stack emphasizing individual cell characteristics," ASME Journal of Fuel Cell Science and Technology, Vol.6-1, Feb.2009, pp. 01101901-01101911. (80%)

  36. S. V. Angadi*, R. L Jackson, S.-Y. Choe, G. T Flowers, J. C Suhling, Y.-K Chang, J.-K. Ham, "Reliability and life study of hydraulic solenoid valve - Part 1 - A Multi-physics finite element mode," Journal of Engineering Failure Analysis, Vol. 16-3, April 2009, pp. 874-887. (30%)

  37. S. V. Angadi*, R. L Jackson, S.-Y. Choe, G. T Flowers, J. C Suhling, Y.-K. Chang, J.-K. Ham, J.-I Bae, "Reliability and life study of hydraulic solenoid valve-Part 2 experimental study," Journal of Engineering Failure Analysis, Vol. 16-3, April 2009, pp. 944-963. (30%)

  38. J.-H. Park*, S. H. Yoon, D. Shen, S.-Y. Choe, Y. S. Yoon, M. Park and D.-J. Kim, "Effects of preferred orientation on the piezoelectric properties of Pt/Pb(Zr0.3Ti0.7)O3/Pt thin films grown by sol–gel process," Journal of Material Science: Materials in Electronics, Vol. 20-4, April 2009, pp. 366-373. (20%)

  39. J. He*, S.-Y. Choe, C.-O. Hong, "Analysis and control of a hybrid fuel delivery system for a PEM fuel cell," Journal of Power Sources, Vol. 185-2, Dec. 2008. pp. 973-984 (60%).

  40. D. Shen, H. C. Wikle III, S.-Y. Choe, and D.-J. Kim, "Piezoelectric energy harvesting device in a viscous fluid for high amplitude vibration application," Applied Physics Express, Vol. 1, 098002 2008. (30%)

  41. S.-Y. Choe, "Dynamic simulator and controls for a PEM fuel cell power system," Journal of the World Electric Vehicle Association, Vol.2-3, 2008, pp. 219-235. (100%)

  42. J.-G. Lee, S.-Y Choe, J.-W. Ahn* and S.H. Baek, "Modeling and simulation of a PEM fuel cell system with a PWM DC/DC converter for stationary applications," Institution of Engineering and Technology, Power Electronics, Vol. 1/3, 2008, pp. 305-317. (80%)

  43. S.-K Park, S.-Y. Choe, S.-H. Choi, "Dynamic modeling and analysis of a shell-and-tube type gas-to-gas membrane humidifier for PEM fuel cell applications," International Journal of Hydrogen Energy, Vol. 33/9, 2008, pp. 2273-2282. (80%)

  44. D.-A. Shen, J.-H. Park, J. Ajitsaria*, S.-Y. Choe, Howard C. Wikle III, and Dong-Joo Kim, "Design, fabrication, and evaluation of a MEMS PZT cantilever with an integrated Si proof mass for vibration energy harvesting," Journal of Micro-mechanics and Micro-engineering, Vol. 18, 2008, pp. 55017-55024. (20%)

  45. S.-K. Park and S.-Y. Choe, "Dynamic modeling and analysis of a 20-cell stack considering temperature and two phase effects," Journal of Power Sources, Vol. 179/2, 2008, pp. 660-672. (80%)

  46. S.-Y. Choe, J.-W Ahn, J.-G Lee and S.-H. Baek, "Dynamic simulator for a PEM fuel cell system with a PWM DC/DC converter," IEEE Transactions on Energy Conversion, Vol. 23/2, June, 2008, pp. 669-680. (80%)

  47. J.-W. Ahn* and S.-Y. Choe, "Coolant controls of a PEM fuel cell power system," Journal of Power Sources, Vol. 179/2, May 2008, pp. 660-672. (80%)

  48. D.-J. Kim, D.-N. Shen, S.-H. Yoon, S.-Y. Choe and D.Y. Kaufman, "Effect of Ru and LaNiO3 barrier layers on lead zirconate titanate films grown on nickel-based metal foils by sol-gel process," Ceramics International, Vol. 34/5, 2008, pp. 1261-1265. (20%)

  49. D. Shen, S.-Y. Choe and D.-J. Kim, "Analysis of piezoelectric materials for energy harvesting devices under high-g vibration," Japanese Journal of Applied Physics, Vol. 46/10A, 2007, pp. 6755-6760. (20%)

  50. J. Ajitsaria*, S.-Y. Choe, D. Shen and D.-J. Kim, "Modeling and analysis of a bimorph piezoelectric cantilever beam for voltage generation," Smart Materials and Structures, Vol. 16/2, 2007, pp. 447-454. (60%)

  51. Y. Shan*, S.-Y. Choe and S.-H Choi, "Unsteady 2D PEM fuel cell modeling for a stack emphasizing thermal effects," Journal of Power Sources, Vol. 165, No. 1, February 2007, pp. 196-209. (80%)

  52. S.-Y. Choe, J.-G. Lee, J.-W. Ahn* and S. H. Baek, "Integrated modeling and control of a PEM fuel cell system with a DC/DC PWM converter," Journal of Power Sources, Vol. 164/2, 2007, pp. 614-623. (80%)

  53. Y. Shan* and S.-Y. Choe, "Modeling and simulation of a PEM fuel cell stack considering temperature effects," Journal of Power Sources, Vol. 158/1, 2006, pp. 274-286. (80%)

  54. Y. Shan* and S.-Y. Choe, "A high dynamic PEM fuel cell model with the temperature effects," Journal of Power Sources, Vol. 145/1, 2005, pp. 30-39. (80%)

  55. M.-H. Shin, D.-S. Hyun, S.-B. Cho and S.-Y. Choe, "An improved stator flux estimation for speed sensorless stator flux orientation control of induction motors," IEEE Transactions on Power Electronics, Vol. 15/2, 2000, pp. 312-318.

  56. Y.-H. Park, H.-S. Moon and S.-Y. Choe, "Modeling and dynamic analysis of electro-mechanical system in machine tools - Gain tuning of PI speed controller," Journal of the Korean Society of Precision Engineering,” Vol. 16/94, 1999, pp. 265-271. (60%)

  57. Y.-H. Park, H.-C. Shin, H.-S. Moon and S.-Y. Choe, "Dynamic modeling and analysis of electro-mechanical system in machine tools – Modeling and dynamic analysis of a feed system," Journal of the Korean Society of Precision Engineering, Vol. 16-2/95, 1999, pp. 218-224. (60%)

  58. S.-Y. Choe and K. Heumann, "Power converter system in power utilities (Stromrichter im Versorgungsnetz)," ElektroTechnik Zeitschrift, Vol. 112/23, 1991, pp. 1300-1306. (80%)

Invited Paper and Lecture

  1. S.-Y. Choe, "Design of Fast Charging Method of Lithium-Ion Batteries Based on Electrochemical Model," Korea Battery Conference, May 2018.

  2. S.-Y. Choe, "Fast and Safe Charging of NMC/Graphite Lithium Ion Batteries," Daegu International Future Auto Forum, Oct. 2018.

  3. S.-Y. Choe, "Fast Charging Method based on Electrochemical Thermal Model for Lithium Ion Polymer Battery," Daegu International Future Auto Forum, Nov. 2017.

  4. S.-Y Choe, "Fast charging method," Jeju electric vehicle conference, March 23, 2016

  5. S.-Y. Choe, "Modeling, analysis and controls of lithium ion batteries," Korea Maritime engineering conference, Green ship session, June 24, 2016

  6. S.-Y. Choe, "First Principle of Modeling, Analysis and Controls for Advanced Lithium battery," Society of Korea electrochemistry, April 7th, 2016

  7. S.-Y. Choe, " Hybrid and electric vehicles and batteries technologies, " Workshop for Automotive Manufacturing and Automation Technology, Tuskegee University, Electric Vehicle Transportation Center (EVTC), October 6, 2015

  8. S.-Y. Choe, "Principles of Controls and PLC," Workshop for Automotive Manufacturing and Automation Technology, Auburn, April, 2015

  9. S.-Y. Choe, "Modeling, Analysis and controls of Lithium Ion Polymer batteries," University of Alabama, April 1, 2015.

  10. S.-Y. Choe, Meng Xiao, and Victor Agubra, “Modeling, Analysis and controls of Lithium Ion Polymer batteries," Oak Ridge National Laboratory, Dec. 18, 2014.

  11. S.-Y. Choe, "High resolution modeling of li-ion battery and its applications," SEC Symposium, Atlanta, GA, Feb. 10-12, 2013.

  12. S.-Y. Choe, "Highly reliable and efficient operations of a PEM fuel cell system," 2007 International Seminar on Reliability Technology, November 2007.

  13. S.-Y. Choe, "The state-of-the-art power electronics in automotive applications," Proceedings of the International Conference Power Electronics, October 2001, pp. 870-879. (100%)

Conference Proceedings Articles

  1. S.-Y. Choe, Y.L Yin, M.S Song, "Fast charging method for Lithium ion batteries suppressing side reactions and lithium plating," 32nd Electric Vehicle Symposium (EVS32), Lyon, France, May 19 - 22, 2019.

  2. Y.-L. Bi and S.-Y. Choe, "A Hybrid State of Charge Estimation Method of a LiFePO4/Graphite Cell Using a Reduced Order Model with an Extended Kalman Filter," ACC, 2019

  3. Y.-L. Bi and S.-Y. Choe, "Automatic Estimation of Parameters of a Reduced Order Electrochemical Model for Lithium-ion Batteries at the Beginning-of-life," IEEE VPPC, August 27th-30th, Chicago 2018

  4. Y. Zhao, R. Fu, S.-Y. Choe, "Modeling of SEI formation based on a electrochemical reduced order model for Li(MnNiCo)O2/Carbon polymer battery", IEEE Vehicle Power and Propulsion Conference (VPPC), 2015.

  5. Y. Zhao, S.-Y. Choe, "Evaluation of Order Reduction Techniques for Porous Electrode Diffusion Equation in Lithium Ion Model" SAE Technical Paper, No. 2014-01-1835. 2014.

  6. Y. Zhao and S.-Y Choe, "Evaluation of Order Reduction Techniques for Porous Electrode Diffusion Equation in Lithium Ion Model," No. 2014-01-1835, Society of Automotive Engineering, April ,2014

  7. X. Li*, and S.-Y. Choe, "State-of-charge (SOC) estimation based on a reduced order of electrochemical thermal model and extended Kalman filter," Proceeding of American Control Conference, Washington, 2013.

  8. Victor Agubra, J. W. Fergus, Rujian Fu and S.-Y Choe, "The Effect of Battery Potential and Charge Rate on the Decomposition Reaction on the Anode Electrode of Lithium Ion Polymer Battery," 225th Meeting of Electrochemical Society, Orlando, USA, 2013.

  9. J. W. Fergus, S.-Y. Choe, Victor Agubra and Rujian Fu, "Lithium Ion Battery Degradation Due to Anode-Electrolyte Reaction," 224th Meeting of Electrochemical Society, San Francisco, USA, 2013.

  10. X. Li*, M. Xiao*, K. Malinowski*, and S.-Y. Choe," State-of-charge (SOC) estimation based on reduced order of electrochemical model for a pouch type high power Li-polymer battery," IEEE Vehicle Power and Propulsion Conference, S11-4 Sept, 2011.

  11. J.-W. Ahn*, J.-L. He and S.-Y. Choe, "Design of Air, Water, Temperature and Hydrogen controls for PEM Fuel Cell System," Proceedings of the ASME International Conference on Fuel Cell Science, Engineering and Technology, August 2011, paper Nr. ESFuelCell2011-54554.

  12. X. Li *, M. Xiao*, and S.-Y. Choe, "Reduced order of electrochemical model for a pouch type high power Li-polymer battery," IEEE International Conf. On Clean Electrical Power, Italy, June 14th-16th, 2011.

  13. V. Krithivasan*, R. L. Jackson, R. W. Russell*, S.-Y. Choe and H. Jo, "Sensor Module Development for Study of Tire Deformation," Proceeding of the 29th Annual Meeting on Tire Science and Technology, 2010.

  14. J. R. Polchow, S. V. Angadi, R. Fu*, S.-Y Choe, R.L. Jackson, G.T. Flowers, B.-Y. Lee, and L. Zhong, "A Multi-Physics Finite Element Analysis of Round Pin High Power Connectors," The Joint 25th International Conference on Electrical Contacts and the 56th IEEE Holm Conference on Electrical Contacts, Charleston, October 4-7, 2010.

  15. S. V. Angadi, R. L. Jackson, S.-Y. Choe, G. T. Flowers, B.-Y. Lee and L. Zhong, "A Multi-physics Finite Element Model of a 40A Automotive Connector including Multiscale Rough Surface Contact," The Joint 25th International Conference on Electrical Contacts and the 56th IEEE Holm Conference on Electrical Contacts, October 4-7, 2010.

  16. R. Fu*, S.-Y Choe, R. L. Jackson, G. T. Flowers, M.l J. Bozack, L. Zhong, and D. Kim, "Experimental Study of the Vibration-induced Fretting of Silver-plated High Power Automotive Connectors," The Joint 25th International Conference on Electrical Contacts and the 56th IEEE Holm Conference on Electrical Contacts, October 4-7, 2010.

  17. M. Xiao*, S.-Y. Choe and F. Rahman, "Static and dynamic analysis of Li-polymer Battery using Thermal Electrochemical Model," Proceeding of the IEEE Conf. on Innovative Technologies for an Efficient and Reliable Electricity Supply (CITRES), Sept. 2010, pp. 309-316.

  18. J.-W. Ahn* and S.-Y. Choe, “A Thermal Management System for a PEM Fuel Cell System in Commercial Vehicles,” Proceedings of the ASME International Conference on Fuel Cell Science, Engineering and Technology, June 2010, paper Nr. 2010-33217.

  19. J.-W. Ahn* and S.-Y. Choe, “ Dynamic Modeling of a 110-cell PEM Fuel Stack Considering Temperature and Two-phase Effects,” Proceedings of the ASME International Conference on Fuel Cell Science, Engineering and Technology, June 2010, paper Nr. 2010-33218.

  20. J. He*, S.-Y. Choe, “Modeling and Control of a Hybrid Fuel Delivery System Based on a Two-phase Anodic Model of a PEM Fuel Cell,” Proceedings of the ASME international Conference on Fuel Cell Science, Engineering and Technology, June 2010, paper Nr. 2010-33309.

  21. J. He*, S.-Y. Choe, “Modeling a Two-phase Control-oriented Transient Model of a Single PEM Fuel Cell,” Proceedings of the ASME international Conference on Fuel Cell Science, Engineering and Technology, June 2010, paper Nr. 2010-33310.

  22. V. Krithivasan*, R.L. Jackson, R.W.Green*, and S.-Y. Choe, “Characterization of Tire Behavior by a Finite Element Method (Part I)-Normal Load and Camber Angle,” Proceeding of the 28th Annual Meeting on Tire Science and Technology, 2009.

  23. H. Lee*, S.-Y. Choe, “Dynamic modeling and analysis of a 88-cell PEM fuel cell stack considering temperature and liquid water,” The 5th IEEE Vehicle Power and Propulsion Conference (VPPC), 2009, pp. 678-685.

  24. J. He*, S.-Y. Choe, C.-O. Hong, “ Analysis of Pressure Drop and Water Flooding of Two-phase Flow along Channels for a PEM Fuel Cell System,’ Proceedings of the ASME International Conference on Fuel Cell Science, Engineering and Technology, June 2009, paper Nr. 2009-85175.

  25. S. V. Angadi*, R. L Jackson, S.-Y. Choe, G. T Flowers, J. C Suhling, Y.-K Chang, J.-K. Ham, “Reliability and Life Study of Hydraulic Solenoid Valve - Part 1 - A Multi-physics Finite Element Model,” to appear in the proceedings of the Society of Automotive Engineering 2009 World Congress, Detroit, MI, April 20-23, 2009.

  26. S. V. Angadi*, R. L Jackson, S.-Y. Choe, G. T Flowers, J. C Suhling, Y.-K Chang, J.-K. Ham, J.-I Bae, “Reliability and Life Study of Hydraulic Solenoid Valve - Part 2 - Experimental Study,” to appear in the proceedings of the Society of Automotive Engineering 2009 World Congress, Detroit, MI, April 20-23, 2009.

  27. D.-J. Kim, J.-H. Park, D. Shen, J. Ajitsaria*, and S.-Y. Choe, “PZT-based MEMS Devices for Vibration Energy Harvesting,” to appear in the proceedings of the 17th International Symposium on the Applications of Ferroelectrics and 2008 Meeting of the Electronics Division of the American Ceramic Society, 2008.

  28. J. He*, S.-Y. Choe, C.-O. Hong, “Modeling and Controls of a Fuel Delivery System with Dual Recirculation Lines for a PEM Fuel Cell System,” Proceedings of the ASME International Conference on Fuel Cell Science, Engineering and Technology, June 2008, paper Nr. 2008-65064.

  29. R. L. Jackson, W. R. Ashurst, G. T. Flowers, S. V. Angadi, S.-Y. Choe, M. J. Bozack, “The effect of initial connector insertions on electrical contact resistance,” to appear in the Proceedings of the IEEE Holm Conference on Electrical Contacts, 2007, pp. 17-24.

  30. S.-Y. Choe, “Dynamic simulator and controls for a PEM fuel cell power system,” the Proceedings CD of the Electric Vehicle Symposium, 7E, propulsion systems, 2007.

  31. J.-W. Ahn*, S.-Y. Choe and S.-K. Park, “Modeling and control of air and coolant flow for a PEM fuel cell system,” Proceedings of the ASME International Conference on Fuel Cell Science, Engineering and Technology, June 2007, paper Nr. 2007-25247.

  32. J. Ajitsaria*, S.-Y. Choe, D. Kim, D. Shen, “Modeling of bimorph piezoelectric cantilever beam for voltage generation,” Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, Proceedings of SPIE, Vol. 6529, 2007, pp. 652910-1 to 652910-11.

  33. D. Shen, S.-Y. Choe and D.-J. Kim, “Comparison of piezoelectric materials for vibrating energy conversion devices,” Proceedings of the Materials Research Society Symposium, Vol. 966, page 0966-07-34, 2007.

  34. D. Shen, J. Ajitsaria*, S.-Y. Choe and D.-J. Kim, “Evaluation and modeling of power generator with bimorph PZT cantilever,” Materials Research Society Symposium Proceeding, Vol. 966, page 0966-T07-29, 2007.

  35. D. Shen, J. Ajitsaria*, J.-G. Lee, S.-Y. Choe and D.-J. Kim, “Comparative study of piezoelectric materials for power Scavenger,” Proceedings of the 2006 Materials Science & Technology: Materials and Systems, Vol. 2, 2006, pp. 167-176.

  36. D. Shen, S.-Y. Choe and D.-J. Kim, “Comparative study of piezoelectric transducers for power scavengers,” Proceeding of the IEEE 15th International Symposium on the Applications of Ferroelectrics, 2006, pp. 224-227.

  37. D. Shen, J. Ajitsaria*, S.-Y. Choe and D.-J. Kim, “The optimal design and analysis of piezoelectric cantilever beams for power generation devices,” Materials Research Society Symposium Proceeding, Vol. 888, 2006, pp. V03.04.1-V03.04.6.

  38. J-G. Lee, S.-Y. Choe, J-W Ahn* and S.-H. Baek, “Integrated modeling and simulation of a PEM fuel cell system for active and reactive power compensation,” Proceedings of IEEE Power Electronics Specialists Conference, June 2006, Digital Object Identifier 10.1109/PESC.2006.1712098 pp. 1-8.

  39. Q.-L Yu, S.-Y. Choe, A.-K. Srivastava and W.-Z. Gao, “Improved modeling and control of a PEM fuel cell power system for vehicles,” Proceedings of IEEE South East Conference, Memphis, March 30th-April 2nd, 2006, pp. 331-336.

  40. S. Adanur, F. Abdel-Hady, S-Y. Choe, B. Tatarchuk, Q. Fan and S. Warner, “Coated and Laminated Fabrics for Fuel Cells,” Technical letter, National Textile Center Research Briefs, June 2006, http://www.ntcresearch.org/pdf-rpts/Bref0606/F04-AE01-06e.

  41. Y. Shan* and S.-Y. Choe, “Computation of dehydration effects of the membrane on a PEM fuel cell,” Proceedings of ASME 3rd International Conference on Fuel Cell Science, Engineering and Technology, 2005, paper Nr. Fuel cell 2005-74163.

  42. S. Adanur, F. Abdel-Hady, S.-Y. Choe, Q. Fan and S. Warner, “Coated and Laminated Fabrics for Fuel Cells,” Technical Letter, National Textile Center Research briefs, June 2005, http://www.ntcresearch.org/pdf-rpts/Bref0605/F04-AE01-05e.

  43. J. Wu, Q Liu and S.-Y. Choe, “Integrated Multi-Resolution Fuel Cell Simulation,” 204th Electrochemistry Society Proceedings of Power Sources for Transportation Applications, ECS, Vol. 2003-24, 2003, pp. 251-262.

  44. W. Gao, Q. Yan, J. Wu and S.-Y. Choe, “Transient model-based PEM fuel cell system control,” 204th Electrochemistry Society Proceedings of Power Sources for Transportation Applications, ECS, Vol. 2003-24, 2003, pp. 240-250.

  45. J.-H. Jung, Y.-K. Lee and S.-Y. Choe, “Power control strategy based on SOC for series hybrid electric vehicle system,” Proceedings of the 1st China-Japan Electric Vehicle Joint Conference, Beijing, China, November 2001, pp. 156-163.

  46. H.-D. Lee and S.-Y. Choe, “Future trend of electric, hybrid and fuel cell vehicles”, Proceedings of the Korean Institute of Electrical Engineering, Vol. 49/5, May 2000, pp. 4-10.

  47. S.-Y. Choe, “Future trend of electric, hybrid and fuel cell vehicles,” Proceedings of the Korean Society of Automotive Engineers, September 2000, pp. 31-45.

  48. J.-D. Kim and S.-Y. Choe, “PWM ASIC development for AC servo and spindle motor control,” Proceeding of the Korean Institute of Power Electronics, January 2000, pp. 605-609.

  49. K. S. Park, S. C. Ahn, D. S. Hyun, and S.-Y. Choe, “New control scheme for 3-phase PWM AC/DC converter without phase angle detection under unbalanced input voltage conditions,” Proceedings of the Fifteenth Annual IEEE Applied Power Electronics Conference, Vol. 1, February 2000, pp. 501-505.

  50. K.-S. Park, S.-C. Ahn, D.-S. Hyun and S.-Y. Choe, “Control scheme for 3-Phase PWM AUDC Converter Considering Unbalanced Input Voltage,” Proceedings of the IEEE Industrial Electronics, Controls, and Instrumentation Conference, Vol. 1, 1999, pp. 496-501.

  51. M. H. Shin, D. S. Hyun, S. B. Cho and S.-Y. Choe, “An improved Stator Flux Estimation for Speed Sensorless Stator Flux Orientation Control of Induction Motors,” Proceedings of the IEEE Power Electronic Specialists Conference, 1998, pp. 1581-1586.

  52. M.-H. Shin, D.-S. Hyun, S.-B. Cho and S.-Y. Choe, “Speed sensorless vector control of induction motors with an improved stator flux estimator,” Proceedings of the Korean Institute of Power Electronics, July 1998, pp. 371-375.

  53. H-S. Kim, H.-S. Mok, G.-H Choe, D.-S. Hyun and S.-Y. Choe, “Design of current controller for 3-phase PWM converter with unbalanced input voltage,” Proceedings of the IEEE Power Electronic Specialists Conference, 1998, pp. 503-509.

  54. D.-K. Min, S.-C. Ahn, D.-S. Hyun and S.-Y. Choe, “Optimal Control of a Three-Phase Voltage-Source PWM Converter with an Expanded Operation Region,” Proceedings of the Korean Institute of Power Electronics, June 1998, pp. 156-164.

  55. C.-T. Kim, C.-W. Noh and S.-Y Choe, “Improvement of speed ripple in low speed range for PMSM using observer,” Proceedings of the Korean Institute of Power Electronics, July 1997, pp. 65-69.

  56. Y.-K. Lee, C.-W Noh and S.-Y. Choe, “Design and simulation of analog controller for 3 phase PWM converter based on stationary reference frame,” Proceedings of the Korean Institute of Power Electronics, July 1997, pp. 14-20.

  57. H.-C Shin and S.-Y. Choe, “Application of linear motor for the high-speed feed system of machine tools,” Proceedings of the Korean Society of Precision Engineering Conference, 1996, pp. 621-625.

  58. Y.-M. Yang, S.-C. Lee, S.-Y. Choe and S.-K. Kang, “A study on the development of CAM system for turning,” Proceedings of the Korean Society of Precision Engineering Conference, 1996, pp. 529-533.

  59. Y.-H. Park, H.-C. Shin, H.-S. Moon and S.-Y. Choe, “Modeling and dynamic analysis of electro-mechanical system in machine tools,” Proceedings of the Korean Society of Precision Engineering Conference, 1995, pp. 991-994.

  60. H.-B. Lim, C.-W. Noh and S.-Y. Choe, “Development of motor drives for machine tools,” Proceedings of the Korean Society of Precision Engineering Conference, 1995, pp. 1009-1012.

  61. H.-S. Jang and S.-Y. Choe, “Application of non-causal filter to a PC-NC,” Proceedings of the Korean Society of Precision Engineering Conference, 1995, pp. 1039-1042.

  62. S.-M. Lim, S.-K Kang and S.-Y. Choe, “A stock removal cycle with collision detection function for turning operation,” Proceedings of the Korean Society of Precision Engineering Conference, 1995, pp. 1050-1053.

  63. S.-K. Kang, J.-S. Lee and S.-Y. Choe, “An enhanced shop floor oriented programming (AESOP) system using interactive graphics for the turning machine,” Proceedings of the Korean Society of Precision Engineering Conference, 1995, pp. 707-712.

  64. S.-Y. Choe and K. Heumann, “Harmonic current compensation using three phase current source converter,” Proceedings of the Europe Power Electronics Conference, 1991, pp. 3006-3001.

  65. S.-Y. Choe and K. Heumann, “Current control strategies for active power filter with inductive energy storage,” Proceeding of the International Power Electronics Conference, Vol. 2, April 1990, pp. 817-824.

Presentations and Posters at Conferences

  1. Y. Hu, M.-S. Song, and S.-Y. Choe, "Reduced Order Electrochemical Model of NMC/Graphite Lithium-Ion Battery Considering Variable Diffusion Coefficient of Cathode Electrode: Modeling, Parameter Prediction, and Validation," 2018 NASA Aerospace Battery Workshop, USA.

  2. Y.-L. Yin, X. Zhao and S.-Y. Choe, “Fast Charging (FC) Method Based on Reduced Order Electrochemical Model – NMC/Carbon Lithium-Ion Batteries,” 2018 NASA Aerospace Battery Workshop, USA.

  3. S.-Y. Choe, “Modeling, Analysis and Controls of Lithium ion batteries”, Southern Automotive Conference, 2018, USA.

  4. X. Zhao and S.-Y. Choe, “Analysis of degradation effects caused by side reaction at a wide range of temperature for LiFePO4/graphite cells,” 2017 NASA Aerospace Battery Workshop, USA.

  5. Y. Bi and S.-Y. Choe, “Estimation of SOC of LiFePO4 Cells Using a Reduced Order Model with Extended Kalman Filter,” 2017 NASA Aerospace Battery Workshop, USA.

  6. Y. Bi and S.-Y. Choe, “Online Estimation of Beginning-of-Life Parameters of a Reduced Order Electrochemical Model for a High Power Li-Ion Battery,” 2017 Graduate Engineering research Show case.

  7. Y. Yin and S.-Y. Choe, “Fast charging algorithm based on a reduced electrochemical model,” 15th Annual Element of Mechanical Engineering, 2017.

  8. S.-Y. Choe, “Physics based Modeling of Lithium Ion Polymer Battery and its Applications,” UKC, Washington DC, Aug. 2017.

  9. S.-Y. Choe, “Fast Charging Method based on Electrochemical Thermal Model for Lithium Ion Polymer Battery,” Daegu International Future Auto Forum, Nov. 2017.

  10. Y. Zhao, S.-Y. Choe, J.-D Kee,”Reduced order model based on electrochemical-thermal principle considering degradation for pouch type lithium ion batteries,” Advanced Battery Power, Germany, April 26-27 2016.

  11. Y.-L. Yin, S.-Y Choe and Y.M Gao, “Online State‐of‐Charge Estimation of Absorbent Glass Mat (AGM) Lead‐Acid Battery Using Kalman Filter Considering the Effect of Temperature and Aging,” Advanced Battery Power, Germany, April 26-27 2016.

  12. X. Zhao, S.-Y Choe, “Development and validation of a ROM incorporated by a semi-empirical aging model for a large-format LiFePO4/graphite cell,” Oct 2-7, 2016, The Electrochemical Society, USA

  13. S.-Y. Choe, “Advanced controls of Lithium batteries based on electrochemical and thermal principle,” Auburn University Faculty symposium, Sept. 30, 2015.

  14. V. Agubra, J. Fergus, R. Fu and S.-Y.Choe, “The growth of the surface film on graphite electrode: Influence of SOC,” NASA Battery Workshop, 2013.

  15. Y. Zhao and S.-Y. Choe, “Evaluation of Order Reduction Techniques for Porous Electrode Diffusion Equation in Li-Ion Model, “ NASA Battery Workshop, 2013.

  16. R. Fu and S.-Y. Choe, “Modeling of Degradation Effects from Side Reactions for Li-Ion Polymer Batteries,” NASA Battery Workshop, 2013.

  17. M. Xiao and S.-Y. Choe, “High Frequency Impedance Model Based on Electrochemical Thermal Principle,” NASA Battery Workshop, 2013.

  18. M. Xiao and S.-Y. Choe, “Study of heat of mixing on temperature distribution of a lithium polymer battery,” 221st Meeting of Electrochemical Society, Seattle, USA, 2012.

  19. R. Fu and S.-Y. Choe, “Modeling and Validation of Stress Generation and Volume Change of Li-ion Battery,” 221st Meeting of Electrochemical Society, Seattle, USA, 2012.

  20. M. Xiao and S.-Y. Choe, “Thermal modeling and Analysis of a Pouch type LiPB,” NASA Battery workshop, Nov. 2012.

  21. X. Li and S.-Y. Choe, “SOC estimation based on the reduced order model with extended Kalman filter,” NASA Battery workshop, Nov. 2012.

  22. R. Fu, M. Xiao and S.-Y. Choe, “Modeling, Validation and Analysis of a Pouch Type High Power Lithium ion Battery based on Electrochemical-thermal-mechanical Principles,” Advanced Automotive Battery Conference 2012.

  23. X. Li, Y. Zhao, S.-Y. Choe, “Fast Charging Method for Lithium Battery based on Reduced Order Electrochemical Thermal Model,” Advanced Automotive Battery Conference 2012.

  24. S.-Y. Choe, “Research on High Power Battery for power system-Modeling and its applications,” NASA Battery workshop, Nov. 2011.

  25. M. Xiao* and S.-Y. Choe, “Performance Analysis of Li-polymer Battery based on one Dimensional Dynamic Electrochemical Thermal Model,” Advanced Automotive Battery Conference, May 2010.

  26. Vijaykumar Krithivasan*, Robert L. Jackson, R. W. Russell* and S.-Y. Choe, “Characterization of Tire Behavior by a Finite Element Method, “ 28th Annual meeting and Conference on Tire Science and Technology, Sept, 2009.

  27. Kevin Siniard* and S.-Y. Choe, “Dynamic Modeling of Quasi-1D Automotive Batteries,” Advanced Automotive Battery Conference, May 2008.

  28. Jong-woo Ahn* and S.-Y. Choe, “Coolant flow control with an observer for a PEM fuel cell system,” ASME International Conference on Fuel Cell Science, Engineering and Technology, paper Nr. Fuelcell 2008-65082, June 2008.

  29. H.-J. Lee* and S.-Y. Choe, “Modeling and parametric analysis of a 2 cell PEM fuel cell stack considering two-phase effect,” ASME International Conference on Fuel Cell Science, Engineering and Technology, paper Nr. Fuelcell 2008-65211, June 2008.

  30. Jung Sang Lee and S.-Y. Choe, “Two dimensional unsteady analysis of a PEM fuel cell stack considering temperature and two-phase effects,” ASME International Conference on Fuel Cell Science, Engineering and Technology, paper Nr. Fuelcell 2008-65241, June 2008.

  31. S.-K. Park and S.-Y. Choe, “Modeling and experimental analyses of a two-cell PEM fuel cell stack emphasizing individual cell characteristics,” ASME International Conference on Fuel Cell Science, Engineering and Technology, paper Nr. Fuel cell 2007-25246, June 2007.

  32. S.-Y. Choe, D. Beale and D. Bevly, “Flexible and patentable bio-fueled future hybrid engine for heat, electricity and mechanical power,” Alternative Fuels Conference, October, 2006.

  33. Y. Shan* and S.-Y. Choe, “A new PEM FC model considering temperature effects”, Fuel cell seminar, 2004.

  34. S.H. Song, S.-Y. Choe and J.H Jang, “A PEM fuel cell stack model considering reactants diffusion effects”, Society for Solid-state and Electrochemical Science and Technology Conference, Hawaii, 2004.

  35. J.-H. Jang, S.-Y. Choe and S.-.H. Song, “An analysis on operation conditions of PEMFC to minimize external humidification of Gases”, Society for Solid-state and Electrochemical Science and Technology Conference, Hawaii, 2004.

  36. J. Wu, Q. Yan, W. Gao, P. Rajkumar and S.-Y. Choe, “A mechanistic fuel cell model for system control,” 204th Meeting of Electrochemical Society, Abstract 269, Orlando, October 2003.

  37. Q. Yan, J. Wu, W. Gao, P. Rajkumar, S.-Y. Choe, H. Toghiani and C.U. Pittman, Jr., “Particle level modeling of catalyst layer for PEM fuel cell,” 204th Electrochemistry Society Proceedings of Advanced Materials for Fuel Cells and Batteries, 2003.

  38. Q. Yan, J. Wu, W. Gao, P. Rajkumar and S.-Y. Choe, “Particle level catalyst modeling and simulation,” 204th Meeting of Electrochemical Society, Abstract 1020, Orlando, October 2003.

  39. J. Wu, Q. Liu and S.-Y. Choe, “Integrated multi-resolution fuel cell simulation,” 204th Meeting of Electrochemical Society, Abstract 271, Orlando, October 2003.

  40. W. Gao, Q. Yan, J. Wu and S.-Y. Choe, “Transient model-based PEM Fuel Cell System Control,” 204th Meeting of Electrochemical Society, Abstract 270, Orlando, October 2003.

Patents and Inventions

  1. Control algorithm for synchronization of position loops by interlock methods (Patent No. Korea 10-0205122-0000, K.-H. Lee, S.-K. Kang and S.-Y. Choe, April. 1999.

  2. Turning system and too path generation (Patent No. Korea 10-0257611-0000), S.-Y. Choe, S.-K. Kang and S.-M. Lim, March, 2000.

  3. Air and Coolant circuit configurations and control of fuel cell systems as power source in automotive, stationary and portable applications, Auburn University Technology Transfer (Filing Number; AU#07-08401 for Korea, US and international patent), S.-Y. Choe, J.-W. Ahn, S.-H. Choi, S.-N. Joen and D.-J Kim, (AU 60%), July 10, 2008.

  4. Fast charging algorithms based on Li ion concentrations, S-Y. Choe (90%), Xueyan Li (5%) and Meng Xiao (5%), US Patent No.: 9,197,089, 11/24/2015.

  5. Fast Charging Method of Lithium-Ion Batteries Based on a Reduced Order of Electrochemical Model with Side Reaction, S.-Y. Choe (95%) and Y.L. Yin (5%), IP Invention No.: 2018-036, April 18, 2018.

  6. Fast and safe charging method with negative pulses suppressing side reaction and lithium plating, S.-Y. Choe (95%) and Minseok Song, IP Application Nr. 62/751177, Oct. 26, 2018.