Choi, Hyung Tae
Ph.D.
Year of Graduation: 2025
Current Position: Pohang University of Science and Technology - Post doctoral
Research Interests: L1 controller synthesis, Controlled invariance, Control barrier function, Networked control systems
E-mail: choiht2015@postech.ac.kr
Publications / Awards
Publications
[20] H. T. Choi, "L1 analysis and synthesis for nonlinear systems: Set-invariance-based approach," Doctoral Dissertation, POSTECH, 2025.
[19] H. T. Choi, and J. H. Kim*, "An L∞ performance control for time-delay systems with time-varying delay: delay-independent approach via ellipsoidal D-invariance," Special issue of Numerical Analysis of Differential Equations with Real-world Applications, AIMS Mathematics, vol. 9, no. 11, pp. 30384--30405, 2024.
[18] H. T. Choi, and J. H. Kim*, "The L1 controller synthesis for piecewise continuous nonlinear systems via set invariance principles: A dissemination version," International Conference on Control, Automation and Systems, pp. 877--881, Jeju, Korea, Oct. 29 -- Nov. 1, 2024.
[17] H. T. Choi, J. H. Kim*, and T. Hagiwara, "Characterizing L1 output feedback controller for nonlinear systems: Existence conditions via output controlled invariance domain," International Journal of Robust and Nonlinear Control, vol. 34, no. 17, pp. 11760--11785, 2024, 2024. (SCI)
[16] H. T. Choi, and J. H. Kim*, "On set-invariance for nonlinear output-feedback control systems: A modified control barrier function", International Conference on Control, Automation and Systems, pp. 66--69, Yeosu, Republic of Korea, Oct. 17-- Oct. 20, 2023.
[15] 최형태, 박해연, 김태완, 김정훈*, "RRCF 알고리즘을 활용한 전력시스템의 고장 검출 (RRCF-based fault detection for power systems)," 대한전기학회 하계 학술대회 (KIEE), pp. 1808 -- 1809, 평창, Jul. 12--15, 2023.
[14] 최형태, 김정훈*, "시변 시간지연 시스템에 대한 도달가능집합 추정: 보조 범함수 기반 접근법 (Reachable set estimation for linear systems with time-varying delays: Auxiliary functional approach)," 제어로봇시스템학회 국내학술대회 (ICROS), pp. 112 -- 113, 삼척, Jun. 21--23, 2023.
[13] H. T. Choi, and J. H. Kim*, "The L1 controller synthesis for piecewise continuous nonlinear systems via set invariance principles," International Journal of Robust and Nonlinear Control, vol. 33, no. 14, pp.8670--8692, 2023.
[12] H. T. Choi, H. Y. Park, and J. H. Kim*, "Output-based event-triggered control for discrete-time system with three types of performance analysis," Special issue of Stability and Optimal Control on Uncertain Systems, AIMS Mathematics, Vol. 8, No. 7, pp. 17091-17111, 2023.
[11] H. Y. Park, H. T. Choi, and J. H. Kim*, "The l∞/p-gains for discrete-time observer-based event-triggered systems," International Journal of Robust and Nonlinear Control, Vol. 33, No. 11, pp. 6121--6134, 2023.
[10] H. T. Choi, and J. H. Kim*, "The L∞-gain analysis of time-delay systems via ellipsoidal D-invariance", International Conference on Control, Automation and Systems, pp. 1124--1127, Busan, Republic of Korea, 2022.
[9] 최형태, 김정훈*, "전력 네트워크 시스템의 이상 예측 알고리즘 (Anomaly forecasting algorithm for power network systems)," 대한전자공학회 추계 학술대회 (IEIE), pp. 259 -- 262, 광주, Nov. 25--26, 2022.
[8] 최형태, 김정훈*, "시변 시간지연을 지니는 Positive 시스템의 도달가능집합 추정 (Rechable set estimation for positive systems with time-varying delays)," 대한전기학회/대한전자공학회 정보 및 제어 학술대회 (CICS), pp. 261 -- 262, 평창, Oct. 19--22, 2022.
[7] H. T. Choi, and J. H. Kim*, "Set-invariance-based interpretations for the L1 performance of nonlinear systems with non-unique solutions," International Journal of Robust and Nonlinear Control, Vol. 33, No. 3, pp. 1858 -- 1875, 2023.
[6] 최형태, 김정훈*, "순환신경망을 이용한 전력시스템의 다중-스텝 상태 예측 (Multi-step state forecasting in power systems via recurrent neural network)," 대한전자공학회/대한전기학회 정보 및 제어 심포지움 (KIEE), pp.1855--1856, 여수, Jul. 13--16, 2022.
[5] H. T. Choi, and J. H. Kim*, "The L1 dynamic output-feedback controller synthesis for nonlinear systems", Asian Control Conference, pp.1427--1428, Jeju, Republic of Korea, 2022.
[4] H. T. Choi, and J. H. Kim*, "Invariance domain for the L1 performance of nonlinear systems", International Conference on Control, Automation and Systems, pp.1194--1198, 2021.
[3] 최형태, 김정훈*, "구분적인 연속성을 갖는 비선형 시스템의 L1 제어 문제 (The L1 control problem of piecewise continuous nonlinear systems)," 제어로봇시스템학회 국내학술대회 (ICROS), pp. 639 -- 640, 여수, Jun. 23--25, 2021.
[2] 최형태, 김정훈*, "비선형 시스템의 L1 성능에 관한 연구 (A study on the L1 performance of nolinear systems)," 대한전기학회/대한전자공학회 정보 및 제어 학술대회 (CICS), pp .136 -- 137, 제주, Oct. 22--24, 2020.
[1] HyungTae Choi, "Control theory: an application of frobenius' Theorem", B.S. thesis. POSTECH, 2019
Awards & Scholarship
2025 POSTECH - EE 우수 연구성과 경진대회 - 장려상
2024 NRF-BK21 우수 대학원생 국제 공동연수 지원
2024 POSTECH 우수성과 경진대회 - 우수논문도전상
2024 POSTECH - EE 우수 연구성과 경진대회 - 장려상
2023 POSTECH - EE 우수 연구성과 경진대회 - 장려상
Alexander Meyer
M.S.
Year of Graduation: 2023
Current Position: University of Hawaii Maui College - Lecturer of Astronomy
Research Interests: Application of artificial intelligence in control
E-mail: meyera@hawaii.edu
Publications / Awards
[2] Alexander Meyer, "Fast nonlinear model predictive control using long short -term memory networks", M.S. thesis. POSTECH, 2023.
[1] 알렉산더 마이어, 김정훈*, "LSTM 기반 비선형 모델 예측 제어기의 성능 해석 (Performance analysis of LSTM-based nonlinear model predictive controllers)," 대한전기학회/대한전자공학회 정보 및 제어 학술대회 (CICS), pp. 257 -- 258, 2022.
Publications / Awards
Publications
[3] M. J. Park, "State observer and trajectory tracking controller synthesis for wafer RTA process: Periodic/Nonperiodic linearization scheme", M.S. thesis. POSTECH, 2023.
[2] 박민주, 김정훈*, "웨이퍼 급속 열처리 공정의 선형화 모델 및 온도 추정 알고리즘 (Temperature estimation of wafer rapid thermal process based on its linearization model)," 대한전기학회/대한전자공학회 정보 및 제어 학술대회 (CICS), pp. 255 -- 256, 2022.
[1] 박민주, 김정훈*, "베지에 곡선을 활용한 경로 평활화 및 모바일 로봇의 모델 예측 제어 응용 (Path smoothing via Bezier curve with applications to model predictive control of mobile robots)," 대한전자공학회/대한전기학회 정보 및 제어 심포지움 (ICS), pp.31--32, 2022.
Awards