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Hi-DARTS: Hierarchical Dynamically Adapting Reinforcement Trading System

Published in International Conference on ICT Convergence (ICTC 2025), 2025

Conventional autonomous trading systems struggle to balance computational efficiency and market responsiveness due to their fixed operating frequency. We propose Hi-DARTS, a hierarchical multi-agent reinforcement learning framework in which a meta-agent monitors market volatility and activates frequency-specialized sub-agents, outperforming buy-and-hold baselines in backtesting.

Recommended citation: Hoon Sagong, Heesu Kim, and Hanbeen Hong. (2025). "Hi-DARTS: Hierarchical Dynamically Adapting Reinforcement Trading System." International Conference on ICT Convergence (ICTC 2025).
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Cultural Evaluation of Large Language Models

Submitted to ACL Rolling Review (August 2026 cycle)

We extend cultural-bias benchmarks for LLMs — previously limited to Japanese — to a multilingual setting. I led the construction of the Korean subset and evaluated model behavior under zero-shot prompting, chain-of-thought prompting, and supervised fine-tuning. (First author)

Grounding Word Senses in Vision: Multimodal Word Sense Induction

Published: August 16, 2026

Poster presentation on grounding word sense induction in vision: building visual anchors from ImageNet images and using them to disambiguate word senses, comparing text-only and multimodal clustering across SemCor, DWUG EN, and SemEval benchmarks. Joint work with Zhidong Ling, Hajime Kiyama, and Prof. Mamoru Komachi (Komachi Lab, Hitotsubashi University).