About

Summary

I am a graduate student in Data Science at Seoul National University, researching value alignment in LLMs under Prof. Yohan Jo. Currently, I’m particularly interested in two areas: assessing values in LLMs and reasoning in LLMs. I believe that aligning language models with specific value systems is a crucial first step toward building personalized AI systems. I am also interested in improving reasoning capabilities in LLMs, particularly in mathematical domains.

Research Interests

• Value alignment in LLMs
• Assessing values in LLMs
• Reasoning in LLMs

Publications

Value Portrait: Assessing Language Models’ Values through Psychometrically and Ecologically Valid Items [arXiv]
Jongwook Han*, Dongmin Choi*, Woojung Song*, Eun-Ju Lee, Yohan Jo [ACL] Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics, 2025, *Equal Contributions

PVP: An Image Dataset for Personalized Visual Persuasion with Persuasiveness Ratings, Persuasion Strategies, and Viewer Characteristics [arXiv]
Junseo Kim, Jongwook Han, Dongmin Choi, Jongwook Yoon, Eun-Ju Lee, Yohan Jo
[ACL] Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics, 2025

Preprints

Established Psychometric vs. Ecologically Valid Questionnaires: Rethinking Psychological Assessments in Large Language Models [arXiv]
Dongmin Choi, Woojung Song, Jongwook Han, Eun-Ju Lee, Yohan Jo
Under Review at TACL

Future Policy Aware Preference Learning for Mathematical Reasoning [arXiv]
Minjae Oh, Yunho Choi, Dongmin Choi, Yohan Jo
Under Review at ICLR 2026