Publications

BOOK

IEEE PUBLICATIONs

41.  H.L. Dang, S. Kwak, and S. Choi, "Intelligence Detection of DC Parallel Arc Failure with Featuring from Different Domains, in IEEE Access, doi: 10.1109/ACCESS.2024.3389031.

40.  M. H. Nguyen, S. Kwak, and S. Choi, "Voltage Injection based MPDPC Technique for Individual Phase Loss Reduction in Active Front-End Rectifier," in IEEE Access, doi: 10.1109/ACCESS.2024.3382127.  

39.  M.H. Nguyen, S. Kwak, and S. Choi, "Model Predictive Based Direct Power Control Method Using Switching State Preference for Independent Phase Loss Decrease of Three-Phase Pulsewidth Modulation (PWM) Rectifiers," in IEEE Access, vol. 12, pp. 5864-5881, 2024, doi: 10.1109/ACCESS.2024.3350191.a

38.  H.L. Dang, S. Kwak, and S. Choi, "DC Series Arc Failure Diagnosis Using Artificial Machine Learning With Switching Frequency Component Elimination Technique," in IEEE Access, vol. 11, pp. 119584-119595, 2023, doi: 10.1109/ACCESS.2023.3327465.

37. M.H. Nguyen, S. Kwak, and S. Choi, "Modified Discontinuous Pulsewidth Modulation Approach with Independent Phase Loss Adjustment for Voltage Source Converters," IEEE ACCESS 2023.

36. M.H. Nguyen, S. Kwak, and S. Choi, "Lifetime extension technique for voltage source inverters using selected switching states based MPC method,” IEEE ACCESS 2023.

35. M.H. Nguyen, S. Kwak, and S. Choi, "Model Predictive Control Algorithm for Prolonging Lifetime of Three-Phase Voltage Source Converters," in IEEE Access, vol. 11, pp. 72781-72802, 2023, doi: 10.1109/ACCESS.2023.3294995.

34. M. Diat, C. D. New, S. Choi, and A. Lemmon, "Improved Methodology for conducted EMI assessment of wide bandgap power electronics,"  IEEE Open Journal of Power Electronics, 2022.

33. K. Islam, T.N. Nishat, S. Choi, S. Kwak, and AKM Arafat, "Designing Hih-Power Ultra-high-Speed Motor Using a New Multiphysics Multi-Objective Optimization Method for Mechanical Antenna Applications," IEEE ACCESS, 2022.

32. E. Wodoajo, E. Elbuluk, S. Choi, and H. Abu-Rub, "Three-parts modulation and hybrid DC capacitor voltage balancing for single phase two-leg five-level NPC inverter," IEEE Transaction on Industrial Electronics 2022.

31. H.L. Dang, S. Kwak, and S. Choi, "Identifying DC Series and Parallel ARCs based on Deep Learning Algorithms," IEEE ACCESS 2022

30. K. Islam, T.N. Nishat, S. Choi, S. Kwak, and Y.K. Hong, "Performance Evaluation and Comparison of Three-Phase and Six-Phase Winding in Ultra-High_speed Machine for High-Power Application," IEEE Transaction on Industrial Electronics, 2022.

29. H.L. Dang, S. Kwak, and S. Choi, "Parallel Dc Arc Failure Detection Method based on Artificial Intelligent Techniques," IEEE Access, 2022.

28. H.L. Dang, S. Kwak, and S. Choi, "Different Domain-based Machine and Deep Learning Diagnosis for DC Series Arc Failure," IEEE Access, 2021.

27. K. Islam, S. Choi, Y. Hong, and S. Kwak, "Design of High-Power ultra-High-Speed Rotor for Portable Mechanical Antenna Drives," IEEE Transaction on Industrial Electronics, 2021.

26. JHL Dang, JC Kim, S. Kwak, and S. Choi, "Series DC Arc Fault Detection Using Machin Learning Algorithm," IEEE ACCESS 2021. 

25. Jae-Chang Kim, Sangshin Kwak, and S. Choi, "DC Series arc Detection Algorithm based on Adaptive Moving Average Technique," IEEE ACCESS, 2021.

24. M. Haque and S. Choi, "Sparse Kernel Ridge Regression Assisted Particle Filter based Remaining Useful Life Estimation of Cascode GaN FET," IEEE Transaction on Industrial Electronics, 2020.

23. Jarred Glickstein, Jifu Liang, S. Choi, Arjuna Madanayake, and Soumyajit Mandal, “Power-Efficient ELF Wireless Communications using Electro-Mechanical Transmitters,” IEEE ACCESS, 2020. 

22. Ehsan Saeidpour Parizy, Hamid Bahrami, and S. Choi, “Grid-Specific Co-Optimization of Incentive for Generation Planning in Power Systems With Renewable Energy Sources,” IEEE Transaction on Sustainable Energy, 10.1109/TSTE.2019.2914875. 

21. Mostak Mohammad, S. Choi, and M. Elbuluk, “Loss Minimization Design of Ferrite Core in a DD- Coil based High-Power Wireless Charging System for Electrical Vehicle Application,” IEEE Transaction on Transportation Electrification, 2019. 

20. M. Mohammad, E. Wadajo, S. Choi, and M. Elbuluk, “Modeling and Design of Passive Shield to Limit EMF Emission and Minimize Shield Loss in Unipolar Wireless Charging System for EV,” IEEE Transaction on Power Electronics, 2019.

19. M. Islam, S. Bonthu, AKM Arafat, and S. Choi, “Design of a Robust Five-phase Ferrite-assisted Synchronous Reluctance Motor with Low Demagnetization and Mechanical Deformation,” doi:10.1109/TEC.2018.2882780, IEEE Transaction on Energy Conversion, 2019.

18. AKM Arafat and S. Choi, “Active Current Harmonic Suppression for Torque Ripple Minimization at Open Phase Faults in a Five-Phase PMa-SynRM,” IEEE Transaction Industrial Electronics, pp. 922-931, vol. 66, issue. 2, Feb. 2019.

17. Ehsan Saeidpour Parizy, Haid Bahrami, and S. Choi, “A Low Complexity and Secure Demand Response Technique for Peak Load Reduction,” doi: 10.1109/TSG.2018.2822729, IEEE Trans. on Smart Grid, 2018.

16. S. Choi, Moinul Shahidul Haque, Vamsi Mulpuri, Md. Tawhid Bin Tarek,  Sanjoy Das, Vijay Garg, Dan Ionel, M. Abul Masrur, Behrooz Mirafzal, Yao Duan, and Hamid Toliyat, “Fault Diagnosis Techniques for Permanent Magnet AC Machines and Drives – A Review of Current State of the Art,” IEEE Transaction on Transportation Electrification, vol. 4, no. 2, pp. 444-463, June 2018.

15. Sai Sudheer Reddy Bonthu, Md. Tawhid Bin Tarek, and S. Choi, “Optimal Torque Ripple Reduction Technique for Outer Rotor Permanent Magnet Synchronous Reluctance Motors,” IEEE Transaction on Energy Conversion, vol. 33, no. 3, pp. 1184-1192, Sept. 2018.

14. S.S.R. Bonthu, S. Choi, and J. Beak, “Design Optimization with Multi-physics Analysis on External Rotor Permanent Magnet Assisted Synchronous Reluctance Motors,” IEEE Transaction on Energy Conversion, vol. 33, issue. 1, pp. 290 – 298, Mar. 2018.

13. A.K.M. Arafat and S. Choi, “Optimal Phase Advance under Fault Tolerant Control of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE Transaction on Industrial Electronics, vol. 65, issue 4, pp. 2915-2924, Apr. 2018.

12. Moinul Shahidul Haque, S. Choi, and J. Baek, “Auxiliary Particle Filtering-based Estimation of Remaining Useful Life of IGBT,” IEEE Transaction on Industrial Electronics, vol. 65, no. 3, pp. 2693-2703, March 2018.

11. A.K.M. Arafat, S. Choi, and J. Baek “Open Phase Fault Detection of a Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor based on Symmetrical Components Theory,” IEEE Transaction on Industrial Electronics, vol. 64, issue 12, pp. 9729-9738, Dec. 2017.

10. S.S.R. Bonthu, AKM Arafat, and S. Choi, “Comparisons of Rare-Earth and Rare-Earth Free External Rotor Permanent Magnet Assisted Synchronous Reluctance Motors,” IEEE Transaction on Industrial Electronics, vol. 64, pp. 6465-6474, Aug. 2017.

9. Mostak Mohammed, Md. Zakirul Islam, Sangshin Kwak, Jeihoon Baek, and S. Choi, “Core Design and Optimization for Better Misalignment Tolerance and Higher Range Wireless Charging of PHEV,” IEEE Transactions on Transportation Electrification, vol. 3, no. 2, pp. 445-453, June 2017.

8. S. Choi, Moinul Haque,  A.K.M. Arafat, and H. Toliyat, “Detection and estimation of extremely small fault signature by utilizing multiple current sensor signals in multiphase electric machine,” IEEE Transaction on Industry Applications, vol. 53, issue 3, pp. 2805-2816, Jan. 2017.

7. S. Choi, P. Elham, Bahrami Hamid, and J. Beak, “Iterative Condition Monitoring and Fault Diagnosis of Electric Motor for Harsh Industrial Application,” IEEE Trans. on Industrial Electronics, Vol. 62, no. 3, Mar. 2015. 

6. S. Choi, B. Akin, S. Kwak, and H.A. Toliyat, “A Compact Error Management Algorithm to Minimize False-Alarm Rate of Motor/Generator Faults in (Hybrid) Electric Vehicles,”  IEEE Journal of Emerging and Selected Topic in Power Electronics, vol.2, no. 3, Sept. 2014.

5. S. Kim, J. Park, S. Choi, Y. Kim, and M. Ehsani, “Optimal  Control Method  of Magnetic Switch in High-Voltage Power Supply, IEEE Trans. on Power Electronics, vol. 28, issue. 3, pp. 1065-1071, Mar. 2013.

4. B. Akin, S.  Choi, and H. Toliyat, “DSP Applications in Electric and hybrid electric vehicle,”  Invited paper, IEEE Signal Processing  Magazine, May, pp. 136 – 133, 2012.

3. S. Choi, B. Akin, M. Rahimian,  and H.A. Toliyat, “Performance-Oriented Electrics Motor Diagnostics in Modern  Energy Conversion System,” IEEE Trans. on Industrial Electronics, vol.  59, pp. 1266-1277, Feb. 2012.

2. B. Akin, S. Choi, U. Orguner, and H. Toliyat, “A Simple Real-Time Fault  Signature Monitoring Tool for Motor Drive  Embedded Fault Diagnosis Systems,” IEEE  Trans. on Industrial Electronics, vol. 58, no. 5, pp. 1990 – 2001, May 2011.

1. S. Choi, B. Akin, M. Rahimian,  and H.A. Toliyat, “Fault Diagnosis Implementation of Induction Machine based on  Advanced Digital Signal Processing Techniques,” IEEE Trans. on Industrial  Electronics, vol. 58, no.  3, pp. 957 – 963, Mar. 2011.

IET PUBLICATIONs

3. S.R. Bonthu, S. Choi, and J. Beak, “Comparisons of three-phase and five-phase Permanent Magnet Assisted Synchronous Reluctance Motors,” IET Electric Power Applications, vol. 10, issue 6, pp. 347-355, May 2016.

2. J. Beak, S.S.R. Bonthu, S. Choi, “Design of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor for Low Output Torque Ripple Applications,” IET Electric Power Applications, vol. 10, issue 5, pp. 339-346, May, 2016.

1. AKM Arafat, Khurshedul Islam, Joseph Herbert, and S. Choi, “Magnet Temperature Estimation based on a Novel Frequency Determination Algorithm for the Five-phase PMaSynRM,” IET Transaction on Power Application, 2019.

OTHER PUBLICATIONs

26. M.H. Nguyen, S. Kwak, and S. Choi, “High-Efficient Direct Power Control Scheme Using Predictive Virtual Flux for Three-Phase Active Rectifiers.” Machines 2024, 12, 290. https://doi.org/10.3390/machines12050290

25. M.H. Nguyen, S. Kwak, and S. Choi, “Model Predictive Virtual Flux Control Method for Low Switching Loss Performance in Three-Phase AC/DC Pulse-width-Modulated Converters,” Machines 2024, 12, 66. https://doi.org/10.3390/machines12010066

24.  H.L. Dang, S. Kwak, and S. Choi, “DC Series Arc Fault Diagnosis Scheme Based on Hybrid Time and Frequency Features Using Artificial Learning Models,” Machines 2024, 12, 102. https://doi.org/10.3390/machines12020102

23.  H.L. Dang, S. Kwak, and S. Choi, “Advanced Learning Technique Based on Feature Differences of Moving Intervals for Detecting DC Series Arc Failures.” Machines 2024, 12, 167. https://doi.org/10.3390/machines12030167

22.  H.L. Dang, S. Kwak, and S. Choi, "Various Feature-Based Series Direct Current Arc Fault Detection Methods using Intelligence Learning Models and Diverse Domain Exclusion Techniques,” Machines 2024, 12, 235. https://doi.org/10.3390/machines12040235 

21.  A.H. Okilly, S. Choi, S. Kwak, N. Kim, J. Lee, H. Moon, J. Baek, “Estimation Technique for IGBT Module Junction Temperature in a High-Power Density Inverter.” Machines 2023, 11, 990. https://doi.org/10.3390/machines11110990 

20. M.H. Nguyen, S. Kwak, S. Choi, “Performance Evaluation of Per-Phase Model Predictive Control Schemes for Extending Lifespan of Voltage Source Converters.”  Machines 2023, 11, 1053. https://doi.org/10.3390/machines11121053

19. H.L. Dang, S. Kwak, and S. Choi, "Empirical Filtering-Based Artificial Intelligence Learning Diagnosis of Series DC Arc Faults in Time Domains" Machines 11, no. 10: 968. https://doi.org/10.3390/machines11100968

18. M.H. Nguyen, S. Kwak, and S. Choi, "Comparisons of Loss Reduction Techniques based on Pulsewidth Modulation and Model Predictive Control for Three-phase Voltage Source Inverters,” Machines 2023, 11, 829. https://doi.org/10.3390/machines11080829.

17. HL. Dang, S. Kwak, and S. Choi, "Empirical Filtering based Artificial Intelligence Learning Diagnosis of Series DC Arc Fault in Time Domain," Machines 2023. 

16. M.H. Nguyen, S. Kwak, and S. Choi, "Individual Loss Reduction Technique for Each Phase in Three-phase Voltage Source Rectifier based on Carrier-based Pulse-Width Modulation,”  2023 Journal of Electrical Engineering & Technology. 

15. J. Jeong, S. Kwak, S. Choi, “Degradation-sensitive control algorithm based on Phase Optimization for Interleaved DC-DC Converters,” MDPI, Machines, https://doi.org/10.3390/machines11060624, 2023

14. J. Kim, M.H. Nguyen, S. Kwak, S. Choi, Lifetime Extension Method for Three-phase Voltage Source Converters using Discontinuous PWM Scheme with Hybrid Offset Voltage, MDPI, Machines, https://doi.org/10.3390/machines11060612, 2023.

13. M. Haque, Md Moniruzzaman, S. Choi, S. Kwak, A.H. Okilly, and J. Baek, "A Fast Loss Model for Cascode GaN-FETs and Real-Time Degradation-Sensitive Contol of Solid-State Transformers," MDPI, Sensors, https://doi.org/10.3390/s23094395, 2023.

12. J. Khan, I. Kaur, Y. Aider, H. Cho, S. Choi, and P. Singh, "Transient Thermal Performance Enhancement of Phase Change Material (RT82) Through Novel Pin Arrangements Under Varied  Gravity Conditions,” Numerical Heat Transfer, Part A: Applications, DOI: 10.1080/10407782.2023.2198738, 2023.

11. HL. Dang, HJ Park, S. Kwak, and S. Choi, "Evaluation of Single-Phase DC-AC Converters with Condition Monitoring Algorithm of Aluminum Electrolytic Capacitors Using Artificial Learnings with Vadiour Circuit Signals and Fltering Combinations," J. Elect. Eng. Technol., 2023, https://doi.org/10.1007/s42835-023-01426-x.     

10. J. Kim, S. Kwak, and S. Choi, "Impacts of SiC-MOSFET Gate Osixe Degradation on Three-phase Voltage and Current Source Inverters," Machines 2022, 10, 1194. https://doi.org/10.3390/machines10121194.

9. H. Dang, H. Park, S. Kwak, and S. Choi, "DC-link Electrolytic Capacitors Monitoring Techniques based on Advanced Learning Intelligence Techniques for Three-Phase Inverters," Machines 2022, 10, 1774. https://doi.org/10.3390/machines10121174.

8. HL Dang, JC Kim, SS Kwak, and S. Choi, "Analysis and Diagnosis Scheme of DC Parallel Arc Failure in DC Power Lines," Journal of Electrical Engineering & Technology, 2022.

7. H. Won, Y. Hong, M. Choi, J. Platt, B. Bryant, S. Choi, S. Li, H. Yoon, T.A. Haskew, J. Lee, T. Lee, and T.W. Lim, "Novel Design of Six-phase Spoke-type Ferrite Permanent Magnet Motor for Electric Truck Application," Energy, 2022.

6. JC Kim, S. Kwak, and S. Choi, "Standard Deviation Based Series DC Arc Detection Method for Voltage Source Converters," Journal of Power Electronics, 2022.

5. C. Park, D. Long, S. Kwak, and S. Choi, "Detection Algorithms of Parallel Arc Fault on AC Power Lines based on Deep Learning Techniques," Journal of Electrical Engineering & Technology, 2021.

4. M. Nguyen, S. Kwak, and S. Choi, "Indirect MPC Method with Improved Output Voltage and Current Waveforms for MMCs," Journal of Power Electronics, 2021.

3. Chan Roh, Sangshin Kwak, and S. Choi, "Three-phase three-level four-leg NPC converters with advanced model predictive control," Journal of Power Electronics, 2021.

2. Chan-Ju Park, Hoang-Lon Dang, Sanshin Kwak, and S. Choi, "Deep learning-based series AC arc detection algorithms," Journal of Power Electronics, 2021.

1. Md. Z. Islam, S. Choi, M.E. Elbuluk, S.R. Bonthu, AKM Arafat, and J. Baek, "Design of External Rotor Ferrite-assisted Synchronous Reluctance Motor for High Power Density,” Appl. Sci. 2021.

CONFERENCE PRESENTATIONs

107. Md Z. Hasan and S. Choi, “Impact of Environmental Conditions on the Remaining Useful Lifetime of SiC MOSFET.” IEEE ECCE 2024.

106. MD Rashedur, S. Choi and H.G. Kim, “A High-Speed Rare-Earth Free IPM with Carbon Composite Wrapped Rotor,” IEEE ECCE 2024.

105. Md. Moniruzzaman, S. Choi, and J. Baek, "A Comprehensive Study of Machine Learning Algorithms for GPU base dRealtime monitoring and Lifetime Prediction of IGBTs," IEEE APEC 2024.

104. T. Mannan, A. Amin, S. Choi, and M. Mohammad, "Designing of a 1> 1kV Medium voltage Line Impedance Stabilization Network," IEEE APEC 2024.

103. T. Mannan, A. Amin, and S. Choi, "Investigation of SiC MOSFET Aging Effects on Common-Mode EMI Emission," IEEE ESTS 2023.

102.Md. Moniruzzaman, S. Choi, and J. Baek, "GPU-based Multivariate IGBT Lifetime Prediction," IEEE ECCE 2023.

101. A. Amin, T. Mannan, and S. Choi, "Simple Experimental Characterization of Switching Node Prasistic in Half Bridge Module," IEEE ECCE 2023

100. Dinh Le, A. Amin, and S. Choi, "Network Common Mode EMI Attenuation Using Bandwidth Indexing," IEEE ITEC 2023.

99. Dinh Le and S. Choi, "Network Common Mode EMI Reduction Using Sinusoidal Frequency Modulated Carrier Wave Indexing," IEEE ICPE 2023-ECCE Asia. 

98. Md Islam, K.N. Tasnim, H. Kim, and S. Choi, “Design of Ultra-High-Speed Motor for Fuel-cell air Compressor Using an Amorphous Stator with Multiphase Winding,” IEEE APEC 2023.

97. E. Wadajo, M. Elbuluk, and S. Choi, “Three-parts modulation and hybrid balancing for three phase five level NPC inverter,” IEEE ECCE 2022.

96. Dinh Le, A. Amin, T. Mannan, and S. Choi, “Sinusoidal frequency modulated carrier wave topology,” IEEE ECCE 2022.

95. K.N. Tasnim, Md. Islam, M.S. Haque and S. Choi, “Networked Control of Multiple Ultra-High-Speed (UHS) PMSMs for AMEBA,” IEEE ECCE 2022. 

94. Md Islam, K.N. Tasnim, Zakirul Islam, H. Kim, and S. Choi, “Performance Comparison of Permanent Magnet  Motors for Traction Application,” IEEE ECCE 2022. 

93. (Student Attendance Support Award) M. Didat and S. Choi, “Simple, Low Cost, Method for Measuring Single Phase Line Impedance,” IEEE APEC 2022.

92. (Outstanding Presentation Award) MD Khurshedul Islam, K. Nishat, S. Choi, and P. Singh, “Comparison of Three-Phase and Six-Phase High-Power Ultra-High-Speed Machine for Portable Mechanical Antenna,” IEEE APEC 2022.

91. S.A. Jawdeh, S. Choi, and C. Liu, “Model-Based Deep Learning for Cyber-Attack Detection in Electric Drive Systems,” IEEE APEC 2022.

90. (Student Attendance Support Award) K. Nishat, MD Khurshedul Islam, M. Haque, and S. Choi, “A Novel Speed Controller of Ultra-High-Speed PMSM for A-Mechanically-Based-Antenna (AMEBA),” IEEE APEC 2022.

89. Ashik Amin, Tahmid Ibne Mannan, and S. Choi, "Common Mode EMI Analysis in Power Electronics Enabled Power Systems," IEEE ECCE 2021.

88. MD Khurshedul Islam and S. Choi, "Multiphysics Analytical Optimization Model to Design High-Power, Ultra-High-Speed Machine for Portable Mechanical Antenna Application," IEEE ECCE 2021.

87. Hoyun Won, Yang-Ki Hong, Minyeong Choi, Briana Bryant, Jonathan Platt, and S. Choi, “Cost-Effective Hybrid Permanent Magnet Assisted Synchronous Reluctance Machine for Electric Vehicle,” IEEE IEMDC 2021. 

86. Hoyun Won, Yang-Ki Hong, Minyeong Choi, Briana Bryant, and S. Choi, “Six-phase Fractional-Slot Concentrated Winding Ferrite Spoke-type Permanent Magnet Synchronous Motor for Electric Truck,” IEEE IEMDC 2021.

85. MD Khurshedul Islam and S. Choi, "Rotordynamic Analysis of 500 000 r/min 2 kW Ultra-High-Speed Machine for Portable Mechanical Antenna," IEEE IEMDC 2021.

84. Moinul Haque and S. Choi, "Deep Deterministic Gradient Policy (DDGP) Reinforcement Learning Assisted Degradation-Aware Control of Solid-State Transformer," IEEE APEC 2021.

83. ((i)Student Travel Award, (ii) Invited to a Special Session, and (iii) Technical Session Best Presentation Award) MD Khurshedul Islam and S. Choi, "Modeling and Design of a 6-Phase Ultra-High-Speed Machine for ELF/VLF Wireless Communication Transmitter," IEEE APEC 2021.

82. MD Khurshedul Islam, M. Karimi, and S. Choi, "Design of a Robust Optimal Controller for Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor in Electric Vehicle Application," IEEE APEC 2021.

81. Ashik Amin and S. Choi, "Common Mode EMI Characterization Through Phase Modeling," IEEE APEC 2021.

80. Akm Arafat, MD Khurshedul Islam, Kazi Nishat Tasnim and S. Choi, “Minimum Loss Control of a Five-phase Permanent Magnet Assisted Synchronous Reluctance Motor under Open Phase Fault,”  IEEE ECCE 2020.

79. MD Khurshedul Islam and S. Choi, “Analysis of axial temperature variation effects on the performance of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE ECCE 2020.

78. Ashik Amin and S. Choi, “Common Mode EMI Mitigation at a Power Converter Network,” IEEE ECCE 2020.

77. Moinul Haque and S. Choi, “Analysis and Control of High Power Wireless Battery Charging for Electric Ship Applications,”  IEEE APEC 2020.

76. Moinul Haque and S. Choi, “Real-time Degradation Aware Control of Solid State Transformer,” IEEE APEC 2020.

75. Eshet Wodajo, Malik Elbuluk, and S. Choi, “Capacitor Voltage Ripple Reduction of Hybrid Balanced Two-Leg Five-Level Neutral Point Clamped Inverter,”  IEEE APEC 2020.

74. Eshet Wodajo, Malik Elbuluk, Haitham Abu-Rub, and S. Choi, “Nested Active Balancing DC Link Capapcitor Voltage in Neutral Point Clamped Multilevel Inverters,” IEEE ECCE 2019.

73. Ehsan Saeidpour Parizy, R. Esmaeeli, S. Choi, Hamid Bahrami, “Super Soldier Program: A Numerical Optimization Approach for Optimal Planning and Utilization of Distributed Generation and Storage in Power Grids,” IEEE Power and Energy Conference at Illinois (PECI), Mar. 2019.

72. Ashik Amin and S. Choi, “A Review on Recent Characterization Effort of CM EMI in Power Electronics System with Emerging Wide Band Gap Switch,” IEEE Electric Ship Technology Symposium, Arlington, VA, 2019.

71. S. Dharmasena and S. Choi, “Model Predictive Control of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor considering dynamic model variations under Single Phase Open fault,” IEEE APEC, Anaheim, CA, Mar. 2019.

70. Mostak Mohammad, Moinul Haque, and S. Choi, "Comparison of 22kHz and 85 Khz 50 Kw Single Phase Phase-Shifted Full Bridge Si and SiC Inverter for Inductive Wireless Charging System for Electric Vehicle," IEEE WiPDA, Atlanta, GA, Oct. 2018.

69. Moinul Haque and S. Choi, "Support Vector Regression Assisted Auxiliary Particle Filter based Remaining Useful Life Estimation of GaN FET," IEEE IECON, Washington DC, 2018.

68. Mohammad Tarek, Shamini Dharmasena, Arjuna Madanayake, S. Choi, Jarred Goldstein, Jifu Liang, and Soumyajit Mandal, “Power-Efficient Data Modulation for All-Mechanical ULF/VLF Transmitters,” IEEE MWSCAS, 2018.

67. Sai Sudheer Reddy Bonthu, Md. Zakirul Islam, and S. Choi, “Performance review of permanent magnet assisted synchronous reluctance traction motor designs,” IEEE ECCE in Portland, Oregon, 2018.

66. Mohammad Noor Shaheed and S. Choi, “Reliability Analysis of Small Scale DC Microgrid using Stochastic Hybrid System Modeling,” IEEE ECCE in Portland, Oregon, 2018.

65. AKM Arafat, Md. Zakirul Islam, Md Tawhid Bin Tarek, and S. Choi, “Performace Comparison at Maximum Torque per Ampere Control between Rare Earth and Rare Earth Free Five-phase PMa-SynRM under Open Phase Faults,” IEEE ECCE in Portland, Oregon, 2018.

64. Md. Zakirul Islam,  Md Tawhid Bin Tarek, AKM Arafat, and S. Choi, “Design of Five-phase Bearingless Permanent Magnet Assisted Synchronous Reluctance Motor for High-Speed Applications,” IEEE ECCE in Portland, Oregon, 2018.

63. (Best Paper Award (First place) / IEEE IAS TSC) Mostak Mohammad, M. Haque, and S. Choi, “A Litz Wire Based Passive Shield Design to Limit EMF Emission from Wireless Charging System,” IEEE ECCE in Portland, Oregon, 2018.

62. AKM Arafat, Md. Zakirul Islam, and S. Choi, “Transient Stability Comparison between Five-phase and Three-phase Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE ITEC, Long Beach. CA, 2018.

61. Moinul Haque, and S. Choi, “Evolutionary Time-series Prediction based RUL Estimation of Power Semiconductor Switch for Vehicular Applications,” IEEE ITEC 2018, Long Beach. CA.

60. Moinul Haque, Mohammad Noor Shaheed, and S. Choi, “Application of Deep Learning based Fault Detection and Classification system for Electric Vehicle Micro-grid,” IEEE ITEC 2018, Long Beach. CA.

59. Vamsi Mulpuri, Mohammad Noor Shaheed, Moiinul Haque, and S. Choi, “Multistate Markov Analysis in Reliability Evaluation and Life Time Extension of DC-DC Power Converter for Electric Vehicle Applications,” IEEE ITEC 2018, Long Beach. CA.

58. Shamini Dharmasena, AKM Arafat, S. Choi, “Fault-Tolerant Model Predictive Control of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor under Single Phase Open-Circuit Condition,” IEEE ITEC 2018, Long beach. CA.

57. Md Tawhid Bin Tarek and S. Choi, “Efficiency Optimization Method of a Ultra High Speed, Low Torque Permanent Magnet Motor with Multiphase Configuration,” IEEE ITEC 2018, Long beach. CA.

56. Md. Zakirul Islam, AKM Arafat, and S. Choi, “Determining the Operating Region for Demagnetization-Free Fault Tolerant Control of Multiphase PMa-SynRM,”  IEEE APEC, Tx, 2018.

55. Sai Sudheer Reddy Bonthu, Md Tawhid Bin Tarek, AKM Arafat, Md Zakirul Islam, and S. Choi, “Fault-Tolerant Performance Comparisons between External and Internal Rotor PMa-SynRMs,” IEEE APEC, Tx, 2018.

54. (Best Presentation Award in a Session) Sai Sudheer Reddy Bonthu, Md Tawhid Bin Tarek, Ms Zakirul Islam and S. Choi, “Performance Analysis of Rare-earth and Rare-earth free External Rotor Motors under Eccentricity Faults,” IEEE APEC, Tx, 2018.

53. AKM Arafat and S. Choi, “State Space Modeling and Feedback Control of Five-phase Permanent Magnet Assisted Synchronous Reluctance Motor under Open Phase Faults,” IEEE APEC, Tx, 2018.

52. Mostak Mohammad and S. Choi, “Design and Optimization of Ferrite for Bipolar Wireless Charging Pad to Minimize Core Loss and EMF emission in PHEV/EV Application,” IEEE APEC, Tx, 2018.

51. Arjuna Madanayake, S. Choi, Mohammad Tarek, Shamini Dharmasena, Soumyajit Mandal, Jarred Goldstein, and Alp Sehirlioglu, “Energy-Efficient ULF/VLF Transmitters Based on Mechanically-Rotating Dipoles,” MERCon 2017.

50. Mostak Mohammad and S. Choi, “Sensorless Estimation of Coupling Coefficient Based on Current and Voltage Harmonics Analysis for Wireless Charging System,” IEEE ECCE 2017, Cincinnati, OH.

49. Moinul Shahidul Haque and S. Choi, “Prognosis of Enhance Mode Gallium Nitride High Electron Mobility Transistors using On-state Resistance as a Fault Precursor,” IEEE ECCE 2017, Cincinnati, OH.

48. Vamsi Mulpuri and S. Choi, “Degradation of SiC MOSFETs with gate oxide breakdown under short circuit and high temperature operation,” IEEE ECCE 2017, Cincinnati, OH.

47. Eshet Wodajo, Malik Elbuluk, and S. Choi, “A New Ladder Transistor-Clamped Multilevel Inverter with High Voltage Variation,” IEEE ECCE 2017, Cincinnati, OH.

46. Md Tawhid Bin Tarek and S. Choi, “Design and Rotor Shape Modification of a Multiphase High Speed Permanent Magnet Assisted Synchronous Reluctance Motor for Stress Reduction,” IEEE ECCE 2017, Cincinnati, OH.

45. Md. Zakirul Islam and S. Choi, “Performance Comparison between Three-Phase and Five-Phase Ferrite Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE ITEC 2017.

44. Sai Sudheer Reddy Bonthu and S. Choi, “Five-phase external rotor permanent magnet assisted synchronous reluctance motor for in-wheel applications,” IEEE ITEC 2017.

43. Md. Zakirul Islam and S. Choi, “Design Optimization of Rare-earth Free PM-assisted Synchronous Reluctance Motor to Improve Demagnetization Prevention Capability,” IEEE IEMDC, Miami, FL, 2017.

42. Md. Zakirul Islam, Sai Sudheer Reddy Bonthu, and S. Choi, “Comparison of Two Different Winding Topologies for External-Rotor Five-phase PM-assisted Synchronous Reluctance Motor in Vehicle,” IEEE IEMDC, Miami, FL, 2017.

41. AKM Arafat, Joseph Herbert, and S. Choi, “Study of the Thermal Effects of a Five-Phase Permanent Magnet Assisted Synchronous Reluctance motor under Fault Tolerant Control,” IEEE IEMDC, Miami, FL, 2017. 

40. AKM Arafat and S. Choi, “Torque Ripple Minimization under Unbalanced Phase Resistance in a Five-phase Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE IEMDC, Miami, FL, 2017.

39. Md Tawhid Bin Tarek, Joseph Herbert, and S. Choi, “Analysis of Unbalanced Magnetic Pull of Permanent Magnet Assisted Synchronous Reluctance Motor Based on Uneven Axial Temperature Distribution of Magnets,”  IEEE IEMDC, Miami, FL, 2017. 

38. Md Tawhid Bin Tarek and S. Choi, “Center Post and Rib Length Optimization of a High Speed Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE IEMDC, Miami, FL, 2017.

37. Sai Sudheer Reddy Bonthu, Md. Zakirul Islam, and Tawhid Bin Tarek, and S. Choi, “Design of a rare earth free external rotor permanent magnet assisted synchronous reluctance motor,” IEEE IEMDC, Miami, FL, 2017.

36. Moinul Shahidul Haque and S. Choi, “Prognosis of Power MOSFET Based on Continuous time Markov Process,” IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017.

35. Mohammad Noor Shaheed and S. Choi, “Microgrid Reliability Analysis Under Distributed Degradation Of Semiconductor Power Switch Modules Through A New Stochastic Hybrid System Modeling,” IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017.

34. (Best Presentation Award in a Session) Joseph Herbert, AKM Arafat, and S. Choi, “Novel Frequency Determination Method for Dynamic Magnet Temperature Estimation of a Five Phase PMa-SynRM Using Signal Injection Method,” IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017.

33. AKM Arafat, Joseph Herbert, and S. Choi, “Torque Ripple Minimization of a Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor under Open-Phase Faults,” IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017.

32. Vamsi Mulpuri and S. Choi, “Reliability of SiC Power MOSFETs under High Repetitive Pulse Current Conditions,” IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017

31. Sai Sudheer Reddy Bonthu, Md. Zakirul Islam, A.K.M. Arafat, S. Choi, “Rare-earth free multi-phase motor with fault tolerant control,” Advanced Machinery Technology Symposium by American Society of Naval Engineers, 2016.

30. A.K.M. Arafat and S. Choi, “Comparison of Electrical Losses In An Inverter-fed Five-Phase and Three-Phase Permanent Magnet Assisted Synchronous Reluctance Motor,” IEEE Applied Power Electronics Conference and Exposition (APEC), Longbeach, CA, 2016.

29. J. Herbert, AKM Arafat, Guo-Xiang Wang, S. Choi, “Investigation of a thermal model for a Permanent Magnet assisted Synchronous Reluctance motor,” IEEE Applied Power Electronics Conference and Exposition (APEC), Longbeach, CA, 2016.

28. Moinul Haque, J. Beak, J. Herbert, and S.  Choi, “Prognosis of Wire Bond Lift-Off Fault of an IGBT based On Multisensory Approach,” IEEE Applied Power Electronics Conference and Exposition (APEC), Longbeach, CA, 2016.

27. (Best Presentation Award in a Session) M. Mohammed, S. Kwak, and S. Choi, “Core design for better misalignment tolerance and higher range of wireless charging system for hybrid electric vehicle,” IEEE Applied Power Electronics Conference and Exposition (APEC), Longbeach, CA, 2016.

26. S.R. Bonthu and S. Choi, “Design procedure for multi-phase external rotor permanent magnet assisted synchronous reluctance machines,” IEEE Applied Power Electronics Conference and Exposition (APEC), Longbeach, CA, 2016.

25. (Student Travel Award) Z. Islam and S. Choi, “Design of Rare-Earth Free Five-Phase Outer-Rotor PMa-SynRM Drive for Electric Bicycle,” IEEE Applied Power Electronics Conference and Exposition (APEC), Longbeach, CA, 2016.

24. A.K.M. Arafat and S. Choi, “Fault Tolerant Control of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor based on Dynamic Current Phase Advance,” IEEE Energy Conversion Congress & Expo (ECCE), Montreal, Canada, 2015.

23. Z. Islam, S.S.R. Bonthu, and S. Choi, “Obtaining Optimized Designs of Multi-Phase PMa-SynRM Using Lumped Parameter Model Based Optimizer,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

22. A.K.M. Arafat and S. Choi, “Open phase fault detection of a five – phase permanent magnet synchronous reluctance motor based on symmetrical components theory,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

21. A.K.M. Arafat and S. Choi, “Optimal sustainable fault tolerant control of five – phase permanent magnet assisted synchronous reluctance motor,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

20. E. Pazouki and S. Choi, “Fault diagnosis and condition monitoring of bearing using multisensory approach based FCM clustering,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

19. E. Pazouki, Z. Islam, and S.S.R. Bonthu, and S. Choi, “Eccentricity fault detection in multi – phase permanent magnet assisted synchronous reluctance motor,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

18. S.S.R. Bonthu, J. Baek, Z. Islam, and S. Choi, “Optimal design of five phase permanent magnet assisted synchronous reluctance motor for integrated starter generator application,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

17. S.S.R. Bonthu, S. Choi, and K. Jang, “Design of permanent magnet assisted synchronous reluctance motor with eternal rotor architecture,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May, 2015.

16. Z. Islam and S. Choi, “Design of Five-phase Ferrite Magnet Assisted Synchronous Reluctance Motor using Lumped Parameter Model Based Optimizer and FEA,” International Electric Machines and Drives Conference (IEMDC), Coeur d’Alene, ID, May 2015.

15. J. Baek, S.S.R. Bonthu, S. Kwak, and S. Choi, “Optimal Design of Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor for Low Output Torque Ripple,”  IEEE ECCE 2014, Pittsburgh.

14. S.S.R. Bonthu, J. Baek, and S. Choi, “Comparison of Optimized Permanent Magnet Assisted Synchronous Reluctance Motors with Three-phase and Five-phase Systems,” IEEE ECCE 2014, Pittsburg.

13. E. Pazouki, H. Bahrami, and S. Choi, “Condition Based maintenance optimization of wind turbine generators using degradation prediction,” IEEE PES GM 2014, Washington DC

12. J. Baek, C. Ahn, B. Kim, S. Choi, and S. Kwak, “High Frequency Wireless Power Transfer System for Robot Vacuum Cleaner, “ ICCE 2014.

11. J. Beak S. Kwak, and S. Choi, “Adaptive PWM Algorithm Using Digital-Signal Processing based THD measurement for Electric Vehicle Application,” IEEE Applied Power Electronics Conference and Exposition (APEC), Dallas, Tx, 2014.

10. S. Choi, Bahrami Hamid, and Bilal Akin, “Reliability Assessment of Energy Conversion Components in  a Geographically Distributed Power Grid through Modern Communication Network,”  APEC’13, CA

9. M. Rahimian, S. Choi,  and K. Butler-Purry, “A Novel Analytical Method for Prediction of the Broken  Bar Fault Signature Amplitude in Synchronous Machine Damper Winding and  Induction Machine Cage Rotor,” IEEE ECCE 2011.

8. S. Choi, B. Akin, M. Rahimian,  H.A. Toliyat, “A Robust Sensorless Fault Diagnosis Algorithm for Low Cost Motor  Drive,” APEC’10, Palm spring, CA, USA.

7. S. Choi, B. Akin, M. Rahimian, H.A. Toliyat, and M. Rayner, “Fault monitoring technique of a induction machine with ordered harmonic and noise cancelation,” Electric Machines & Drives Conference (IEMDC), Miami, FL, May 3 – 6, 2009.

6. S. Choi, B. Akin, M. Rahimian,  H.A. Toliyat, and M. Azadpour, “A Generalized Condition Monitoring Method for  Multi-Phase Induction Motors,” IEMDC’09, May 3-6, Miami, FL, USA, 2009.

5. S. Choi, B. Akin, M. Rahimian,  and H.A. Toliyat, “Fault Diagnosis Implementation of Induction Machine based on  Advanced Digital Signal Processing Techniques,” APEC’09, Feb. 15-19,  Washington, DC, USA 2009.

4. B. Akin, S. Choi,  M. Rahimian, and H.A. Toliyat, “DSP Based Continuous Multi-Fault Signature  Monitoring Implementation,” APEC’09, Feb. 15-19, Washington, DC, USA,  2009.

3. S. Choi, J.M. Choi, and J.H. Lee,  “An Initial Timing Offset Estimation Method for OFDM Systems in Rayleigh Fading  Channel,” IEEE VTC 2006-fall, Montreal, CA, Sept. 25-28, 2006.

2. S. Choi, J.M. Choi, and J.H. Lee,  “Study on the OFDM timing synchronization” IEEK-fall 2005, Seoul Korea  vol.28, no. 2, Nov. 2005.

1. S. Choi, J.M. Choi, and J.H. Lee,  “An improved coarse timing offset estimation method For OFDM system,” ITC-CSCC  2005, Che-Ju Korea vol. 2, July. 2005.

MAJOR SEMINARs

15. S. Choi, Ultra High-Speed Machine Design, Invited Presentation, Korea Power electronics Society Winter Workshop, Feb. 2023

14. S. Choi, Rare Earth Material Free Electric Motor for Automotive Market, Panel Presentation, IEEE Transportation Electrification Conference, Detroit, 2023.

13. S. Choi, High Speed Electric Machine Design and Control, Invited Presentation, Oak Ridge National Lab, 2023.

12. S. Choi, Reliability of Power Electronics on Electrified Transportation System, ECE Research Seminar at the University of Arkansas, 2019

11. S. Choi, Reliability of Power Electronics on Electrified Transportation System, ECE Research Seminar at the University of Alabama, 2019

10. S. Choi, Reliability of Power Electronics on Electrified Transportation System, Keynote presentation at IEEE ITEC-Asia, 2019

9. S Choi, Polyphase electric machine applications for traction system, Panel Presentation at IEEE ITEC, 2017.

8. S. Choi, Moinul Haque, and Vamsi Mulpuri, Fault diagnosis of the power converter (SiC, GaN, and Film capacitor) for future high-speed electric motor drive,” Panel Presentation at IEEE PES General Meeting, Chicago, 2017.

7. S. Choi, “Advanced Condition Monitoring and Diagnosis of Electric Propulsion System,” Korea Railroad Research Institute, Aug. 2015.

6. S. Choi, “Advanced Condition Monitoring and Diagnosis of Electric Propulsion System,” Chung-Ang University, Korea, Aug. 2015.

5. S. Choi, “Electric Motor and Battery Application in Transportation System,” Jeonju University, Korea, Aug. 2015.

4. S. Choi, “Critical Service Application of Multiphase Electric Machine: Design and Control,” Korea Electro Technology Research Institute, Korea, July 2015.

3. S. Choi and Mark Rayner, “Advanced condition monitoring and diagnosis for electric motors and drives,” Professional education seminar at IEEE Applied Power Electronics Conference and Expo (APEC), Charlotte, NC, Mar. 2015.

2. S. Choi, Mostak Mohammad, and Bob Chalfant, “Implementation of entrepreneurship education in engineering course program,” VentureWell 19th Annual Conference, Washington D.C., Mar. 2015.

1. S. Choi and E. Pazouki, “Advanced condition monitoring, diagnosis, and maintenance,” Panel presentation at IEEE PES General Meeting, Washington D.C., 2014.

PATENTs

15. USA Patent # 10,429,419 B2, S. Choi, Method for iterative condition monitoring and fault diagnosis of electric machine, 10/01/2019.

14. US Patent #10,185,802, S. Choi and S. Bonthu, “Method for Design and Customization of a Multiphase Electric Motor,” 1/22/2019.

13. USA Patent #:9,787,237, S. Choi and AKM Arafat, “Fault Tolerant Control System for Multiphase Permanent Magnet Assisted Synchronous Reluctance Motors,” 10/10//2017.

12. Korea Patent #: 1013655610000, S. Choi, Y. Yun, K. Kim, H. Kim, S. Yoon, and J. Ahn, “Method for effectively transmitting synchronization channel and method for allocating transmission power for the same,” Feb. 2014.

11. Korea Patent #: 101319870000, S. Choi, Y. Woon, K. Kim, S. Yoon, H. Kim, and J. Ahn, “Method for allocating resource, and method for transmitting resource allocation information,” Oct. 2013.

10. USA Patent #: US8050704 B2, S. Choi, Y. Yun, K. Kim, H. Kim, S. Yoon, and J. Ahn, “Method for effectively transmitting synchronization channel and method for allocating transmission power for the same,” Mar. 2013.

9. Korea Patent #: 1011004450000, S. Choi, K. Kim, S. Yoon, D. Lee, and J. Ahn, “Method Of transmitting scheduling information in TDD system,” Dec. 2011.

8. Korea Patent #: 1010491380000, D. Lee, B. Kim, Y. Yun, K. Kim, D. Roh, S. Yoon, J. Ahn, D. Seo, H. Kim, J. Lee, E. Kim, and S. Choi, “A method for receiving ack/nack signal in mobile communication system,” July 2011.

7. Korea Patent #: 1009254360000, H.S. Kim, S. Choi, K. Kim, S. Yoon, B. Kim, D. Seo, Y. Yun, J. Lee, and S. Jeong, “Method for transmitting control signal using efficient multiplexing,” Oct. 2009.

6. Korea Patent #: 1009178280000, H. Kim, S. Choi, K. Kim, S. Yoon, J. Ahn, B. Kim, D. Seo, Y. Yun, S. Jeong, E. Kim, D. Lee, and J. Lee, “Method for transmitting downlink control signal,” Sept. 2009.

5. USA Patent #: US 8027297 B2, H. Kim, S. Choi, K. Kim, S. Yoon, J. Ahn, B. Kim, D. Seo, Y. Yun, S. Jeong, E. Kim, D. Lee, and J. Lee, “Method for transmitting downlink control signal,” Sept. 2011

4. USA Patent #: US9078247 B2, D. Lee, B. Kim, Y. Yun, K. Kim, D. Roh, S. Yoon, J. Ahn, D. Seo, H. Kim, J. Lee, E. Kim, and S. Choi, “Method for receiving ack/nack signal in mobile communication system,” July. 2015.

3. USA Patent #: US9451613 B2, H. Kim, S. Choi, K. Kim, S. Yoon, J. Ahn, B. Kim, D. Seo, Y. Yun, J. Lee, S. Jeong, and S. Jeong, “Method for transmitting control signal using efficient multiplexing,” Sept. 2016.

2. USA Patent #: US9106379 B2 H. Kim, S. Choi, K. Kim, S. Yoon, J. Ahn, B. Kim, D. Seo, Y. Yun, J. Lee, S. Jeong, and S. Jeong, “Method for transmitting control signal using efficient multiplexing,” Aug. 2015.

1. USA Patent #: US9071400 B2, S. Choi, K. Kim, S. Yoon, D. Lee, and J. Ahn, “Method Of Transmitting Scheduling Information In TDD System,” June 2015.