Hi, welcome to my website. I am a second year combined M.S./Ph.D. student at DSLab@POSTECH, under the supervision of Professor Wook-Shin Han.

Research Interests

My research interests are in Natural Language Processing, with a primary focus on Retrieval-Augmented Generation (RAG).
I am particularly passionate about multimodal document RAG. My current work centers on enabling multihop retrieval from complex documents composed of text, tables, and images. In the future, I plan to extend this research to encompass a broader range of modalities and domains.

Previously, I focused on discovering schemas from JSON documents effectively and efficiently, which resulted in a first-author publication at VLDB.

Publications

2025

LILaC: Late Interacting in Layered Component Graph for Open-domain Multimodal Multihop Retrieval
Yun, J., Lee, D., and Han, W.
In Proc., the 2025 Conference on Empirical Methods in Natural Language Processing, EMNLP, Suzhou, China, November 2025 (First Author)

HELIOS: Harmonizing Early Fusion, Late Fusion, and LLM Reasoning for Multi-Granular Table-Text Retrieval
Park, S., Yun, J., Lee, J., and Han, W.
In Proc., 63rd Annual Meeting of the Association for Computational Linguistics, ACL, Vienna, Austria, July 2025

2024

ReCG: Bottom-Up JSON Schema Discovery Using a Repetitive Cluster-and-Generalize Framework
Yun, J., Tak, B., and Han, W.
In 50th Int’l Conf. on Very Large Data Bases (VLDB) / Proc. the VLDB Endowment (PVLDB), Aug. 2024 (ISSN: 2150-8097) (First Author)

KDD Cup Meta CRAG 2024 Technical Report: Three-Step Question-Answering Framework
Park, S., Seok, J., Lee, J., Yun, J., and Lee, W.
2024 KDD Cup Workshop for Retrieval Augmented Generation

Trivia