Welcome to the
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Research Lab
About Us

Overview | 요약

Stochastic processes and stochastic dynamical systems are widely used in many fields to model real-world systems affected by random phenomena (e.g., inherent uncertainties, external disturbances, measurement noise). Optimal control and estimation in the presence of these random phenomena pose many unique challenges that are absent from deterministic systems. Thus, stochastic systems remains a topic of high interest in the engineering community.

Recently, artificial intelligence (AI) has been immensely useful in the development of tools for stochastic control and estimation, including data-driven control policies and black-box modeling of highly complex dynamics. However, two well-known issues with AI-based methods (specifically, model-free methods) are its reliance on the availability of good-quality data and lengthy training time. While model-based methods, on the other hand, do not suffer from these issues, they often only work for systems under simple or restrictive assumptions, e.g., Gaussian white noise. This suggests that examining the tradeoff between model-free and model-based methods gives to us a wide spectrum of methods for handling stochastic systems.

Our Goal | 목적

We develop theory and algorithms for stochastic control, filtering & estimation, and autonomous decision-making by combining traditional model-based methods with modern data-driven AI methods.
Our research spans a broad range of applications, including motion-planning, fault-tolerance, robotics, reinforcement learning, multi-agent systems, sensor networks, and embodied AI.

See our individual projects for more.

Announcement for Prospective Postdocs:

Prof. Hiroyasu Tsukamoto at UIUC and I are looking for highly-motivated and skilled postdocs to collaborate with our research team on a new government-sponsored, multi-university project at the intersection of human-machine AI autonomy and nonlinear stochastic control theory!

Check out the details in the LinkedIn post [HERE]!
Applications and/or inquiries may be emailed directly to soojean@kaist.ac.kr and hiroyasu@illinois.edu.

To prospective students who would like to join our lab: Thank you, first of all, for your interest. Please consult the following instructions:

  • Undergraduate Interns: Please send an email to acss-admins@kaist.ac.kr with your CV and transcript attached.
  • MS/PhD Applicants: Please first apply through the EE application process [Link]. Then send an email to acss-admins@kaist.ac.kr with your CV and transcript attached.

Other inquiries may also be directed to acss-admins@kaist.ac.kr. Any direct emails to the professor might be missed.

Research | 연구

The research undertaken by ACSS is roughly distinguished by 3 major overlapping categories.
Click on each + to view the projects within each category.

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AUTONOMOUS DECISION-MAKING UNDER SYSTEM & ENVIRONMENT UNCERTAINTIES
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FAST, ANTI-REDUNDANT SITUATIONAL AWARENESS FOR LARGE UNCERTAIN ENVIRONMENTS
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SAMPLE- & MEMORY-EFFICIENT LEARNING FOR CONTROL UNDER UNCERTAINTY

Selected Publications | 논문

  1. Minseok Jeong, SooJean Han, Hyo-Sang Shin, "Scalable Infinitesimal Generator–Based Koopman Learning for Long-Horizon Prediction," Under review, Learning for Dynamics and Control Conference (L4DC), Nov 2025.

  2. Jeongyong Yang, Minseok Jeong, Hyo-Sang Shin, and SooJean Han, “Random Fourier Features Lifted Physics-Informed Koopman Network.” (in Korean.) in Proceedings of the Korean Society for Aeronautical & Space Sciences (KSAS), Nov 2025.

  3. Jeongyong Yang*, KwangBin Lee*, SooJean Han, "Heterogeneous Predictor-based Risk-Aware Planning with Conformal Prediction in Dense, Uncertain Environments." Under review, American Control Conference (ACC), Sep 2025. [PDF]

  4. Nakgyu Yang, Yechan Lee, SooJean Han, “CFG-EC: Error Correction Classifier-Free Guidance,” Submitted to 2026 Winter Conference on Applications of Computer Vision (WACV), Sep 2025.

  5. Sanghun Park, SooJean Han, "Approximate Orthogonal Gradient Descent for the Continual Reinforcement Learning of Robot Control." Conference of Korean Artificial Intelligence Association (CKAIA), Aug 2025.

  6. Eunwoo Sung, SooJean Han, "Distributed Kalman-IMM Cooperative Estimator Synthesis for Large-Scale Networked Switching Systems." To appear, IEEE Conference on Decision and Control (CDC), Jul 2025.

  7. Donggyu Kim, Seungki Min, SooJean Han, "Admission Control via Online Threshold Optimization for Unknown Streaming Task Distributions." Submitted, AAAI Conference on Artificial Intelligence, Jul 2025.

  8. Hyeongmin Choe, SooJean Han, "Advantages of Feedback in Distributed Data-Gathering for Accurate and Power-Efficient State-Estimation." Preprint, Jul 2025. [PDF]

  9. Jeongyong Yang, Hojin Ju, SooJean Han, "Curvature and Energy-based Trajectory Optimization in Unstructured Environments." (in Korean.) Korean Robotics Conference (KRoC), 2025.

  10. Seunghwan Jang, SooJean Han, "Comparison of Compression Codec Algorithms to Image Datasets in 3D Gaussian Splatting Models." (in Korean.) Workshop on Image Processing and Image Understanding (IPIU), 2025.

  11. SooJean Han*, Minwoo Kim*, Ieun Choo, "A Stochastic Robust Adaptive Systems Level Approach to Stabilizing Large-Scale Uncertain Markovian Jump Linear Systems." IEEE Conference on Decision and Control (CDC), Sep 2024. [PDF]

  12. Mukul Chodhary, Kevin Octavian, SooJean Han, "Efficient Replay Memory Architectures in Multi-Agent Reinforcement Learning for Traffic Congestion Control." IEEE Intelligent Transportation Systems Conference (ITSC), Jul 2024. [PDF]

  13. SooJean Han, Soon-Jo Chung, John C. Doyle, "Predictive Control of Linear Discrete-Time Markovian Jump Systems by Learning Recurrent Patterns." Automatica, May 2023. [Link] [PDF]

  14. SooJean Han, Soon-Jo Chung, "Incremental Nonlinear Stability Analysis for Stochastic Systems Perturbed by Lévy Noise." International Journal of Robust and Nonlinear Control, vol. 32, no. 12, p. 7174-7201, Aug 2022. [Link] [PDF]

PI | 교수

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SooJean Han, Ph.D. (한수진)

[Homepage]

PhD Students | 박사과정

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Minseok Jeong (정민석)

Mar 2025 -

MS Students | 석사과정

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Jeongyong Yang (양정용)

Jan 2024-

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Hojin Ju (주호진)

Jan 2024-

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Eun-Woo Sung (성은우)

Feb 2024-

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Sanghun Park (박상훈)

Feb 2024-

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Jeonghyeon Noh (노정현)

Aug 2024-

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Seunghwan Jang (장승환)

Aug 2024-

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Kwang Bin Lee (이광빈)

Aug 2024-

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Jungyo Jung (정준교)

Feb 2025-

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Hyeongmin Choe
(최형민)

Feb 2025-

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Hyewon Choi (최혜원)

Nov 2024-

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Donggyu Kim (김동규)

Feb 2025-
[LinkedIn]

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Yechan Lee (이예찬)

Feb 2025-
[Homepage]

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Nakgyu Yang (양낙규)

Feb 2025-

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Doyoung Heo (허도영)

Aug 2025-

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Mincheol Kang (강민철)

Incoming Spring 2026
[LinkedIn]

(Area of Research Interest: Legend)
  • Stochastic Control
  • Distributed / Multiagent Control
  • Control with Safety
  • Adaptive Control
  • Uncertainty Quantification
  • Uncertain Decision-Making
  • Online Learning
  • Reinforcement Learning
  • Modeling with Generative AI
  • Dynamics Modeling
  • Filtering & State-Estimation
  • Computer Vision & Perception
  • Statistical Learning Theory
  • Application: Robotics
  • Application: Motion-Planning

Research Interns | 연구인턴

  • Chaewoo Lim (임채우). [LinkedIn]
  • Woojin Shin (신우진).
  • Eugene Jeong (정유진).
  • Yongmin Kim (김용민).

Guest Researchers | 게스트 연구원

Past Affiliates

  • Jeonghun You (유정훈). Undergraduate Intern.
  • Nijat Abbasov. KAIST URP Fellow, Undergraduate Intern.
  • SeungEon Lee (이승언). Undergraduate Intern.
  • Jiwoo Park (박지우). Undergraduate Intern.
  • Sanghyun Lee (이상현). Undergraduate Intern.
  • Jerry Song (송제리). Undergraduate Intern.
  • Seongjun Mun (문성준). Undergraduate Intern.
Autonomous Control for Stochastic Systems
School of Electrical Engineering(E3-2), KAIST #2228
291 Daehak-ro, Yuseong-gu, Daejeon 34141,
Republic of Korea
Last updated: Nov 2025.