Reinforcement Learning (RL)

Chang-Hoon Ji

[Github]

Yukyum Kang

[Email]

Ji-Young Hwang

[Github]

About team RL

● Mission: ​
We develop personalized AI diagnostics using reinforcement learning to adapt to individual brain connectivity and medical signals​

● Scope: ​
We use reinforcement learning to reflect individual brain differences and reduce site-specific noise in multi-site fMRI, enabling robust and generalizable diagnostics​

● Goal: ​
Our goal is to build a clinically scalable AI diagnostic system that adapts to patient-specific variability in medical pattern, and balances multiple diagnostic goals for individualized care​​​​​​

Available internship topics

● Conditional Diffusion Modeling for Personalized Medical Signal Synthesis and Reward-Based Quality Evaluation​​ ​​

● Simulation and evaluation of multi-agent reinforcement learning models for role-based diagnostic task distribution​

Our research topics

Personalized Decision Making with Reinforcement Learning

● Our team is using reinforcement learning to support optimal decision-making in personalized and complex medical situations. By continuously learning from patient-specific data such as ROI and EEG-based traits, we generate insights that contribute to more efficient care approaches and improved patient outcomes.

Related publications

[Under review] A Hierarchical Reinforcement Learning Approach to Personalized Decision-Making for Brain Connectivity Segmentation
[Under review] Integrated Ensemble Reinforcement Learning with Unified Decision for Personalized Mild Cognitive Impairment Diagnosis
[Under review] Personalized Brain Dynamic Functional Connectivity with Hierarchical Reinforcement Learning​
[Under review] Ensemble Reinforcement Learning for Personalized Mild Cognitive Impairment Diagnosis
[JBHI'24] Sparse Graph Representation Learning based on Reinforcement Learning for Personalized Mild Cognitive Impairment (MCI) Diagnosis

Feature Selection with Multi-Agent Reinforcement Learning

● We are developing a multi-agent reinforcement learning framework that identifies the most relevant features in medical datasets. This approach enhances diagnostic accuracy and model efficiency by selecting critical biomarkers through agent collaboration.

Related publications

[ICASSP'26] Adaptive Static-Dynamic Functional Connectivity Feature Fusion for Diagnosis of Mild Cognitive Impairment
[ICASSP'26] Reinforcement Learning with Multi-Objective Rewards for Functional Connectivity Augmentation
[ICEIC'26] Adaptive Reward Weighting via Reinforcement Learning for Major Depressive Disorder Diagnosis
[IEEE Trans. SMC'24] MARS: Multi-Agent Reinforcement Learning for Spatial-Spectral and Temporal Feature Selection in EEG-based BCI

Agentic AI with Reinforcement Learning

● We investigate an intelligent system that enables Agentic AI to autonomously set goals and explore problem-solving strategies across diverse domains by leveraging a reinforcement learning–based decision-making framework.

Related publications

[ICEIC'26] Agentic Brain: Agentic AI System for Autonomous Diagnosis of Functional Connectivity Network