publications

2025

1. CoRL

   Q-Guided Flow Q-Learning

   Yejun Jang, Hong Chul Nam, Jeong Min Park, and 2 more authors

   In CoRL 2025 Workshop RemembeRL, Sep 2025

   Abs PDF

   Generative policies improve expressivity over Gaussian actors but often come with entangled training pipelines (e.g., joint actor–critic training, student–teacher distillation, or sequence-to-sequence planners). We introduce \emphQ-Guided Flow Q-Learning (QFQL), an actor–critic framework where the actor is trained \emphindependently via conditional flow matching for behavior cloning, and the critic is trained \emphseparately via temporal-difference (TD) learning. At inference, actions are produced by integrating the flow field and adding a value-seeking correction proportional to the action-gradient of the critic, i.e., a guidance term . This decoupled design simplifies optimization, reduces instability from joint updates, and enables controllable trade-offs between behavioral realism and value-seeking at test time. Empirically, QFQL achieves strong offline reinforcement learning (RL) performance and stable training across tasks without auxiliary student models or policy regularizers, making it a strong candidate for offline RL.

2. KICS

   Exploring the Structure and Hyperparameters of a DQN Model for Penetration Testing on Large-Scale Networks

   Yejun Jang, Jihun Shin, and Janghyong Lee

   In Proceedings of Symposium of the Korean Institute of communications and Information Sciences, Feb 2025

2024

1. CISC-W

   Preventing Model and Data Poisoning Attacks on Military AI Systems via Supply Chain Verification Techniques

   Yejun Jang, Rocky Kim, and Yeongwha Lee

   In Conference on Information Security and Cryptography Winter 2024, Nov 2024

2023

1. Book

   Living Ideas from Future Observers (미래 관찰자의 살아있는 아이디어)

   Institute Seoul National University

   Nov 2023

   Editor and contributor.

2020

1. ISEF

   A Study on Real-Time Feedback System for Forward Head Posture Using Markerless Skeletal Tracking

   Yejun Jang and Sunjin Kim

   In International Science and Engineering Fair (ISEF), May 2020

   ISEF 2020 Finalist

   Finalist