@article{ART003234187},
author={Jun-Won Seo and Junghye Min},
title={Optimization of a Hybrid RAG System for Korean Legal QA},
journal={Journal of The Korea Society of Computer and Information},
issn={1598-849X},
year={2025},
volume={30},
number={8},
pages={53-63}
TY - JOUR
AU - Jun-Won Seo
AU - Junghye Min
TI - Optimization of a Hybrid RAG System for Korean Legal QA
JO - Journal of The Korea Society of Computer and Information
PY - 2025
VL - 30
IS - 8
PB - The Korean Society Of Computer And Information
SP - 53
EP - 63
SN - 1598-849X
AB - Legal question-answering systems demand high reliability and accuracy, and large language models (LLMs) have recently been actively explored to meet these requirements. However, pretrained LLMs often struggle to reflect the most recent case law or specific legal provisions, which can lead to so-called “hallucination” — the generation of factually incorrect information. To address this issue, Retrieval-Augmented Generation (RAG), which generates responses based on external documents, has received growing attention. This study aims to develop a RAG system tailored to the Korean legal domain by optimizing key components including document chunking, embedding models, and retrieval strategies. Experimental results show that combining BM25 with a fine-tuned embedding model trained on Korean legal data, applied to semantically chunked documents, yields the best performance. The proposed hybrid retrieval approach outperformed baseline methods in both retrieval accuracy and factual consistency of the generated answers.
KW - Retrieval-Augmented Generation (RAG);Legal QA;Hybrid Retrieval;Semantic Chunking;Embedding Fine-tuning
DO -
UR -
ER -
Jun-Won Seo and Junghye Min. (2025). Optimization of a Hybrid RAG System for Korean Legal QA. Journal of The Korea Society of Computer and Information, 30(8), 53-63.
Jun-Won Seo and Junghye Min. 2025, "Optimization of a Hybrid RAG System for Korean Legal QA", Journal of The Korea Society of Computer and Information, vol.30, no.8 pp.53-63.
Jun-Won Seo, Junghye Min "Optimization of a Hybrid RAG System for Korean Legal QA" Journal of The Korea Society of Computer and Information 30.8 pp.53-63 (2025) : 53.
Jun-Won Seo, Junghye Min. Optimization of a Hybrid RAG System for Korean Legal QA. 2025; 30(8), 53-63.
Jun-Won Seo and Junghye Min. "Optimization of a Hybrid RAG System for Korean Legal QA" Journal of The Korea Society of Computer and Information 30, no.8 (2025) : 53-63.
Jun-Won Seo; Junghye Min. Optimization of a Hybrid RAG System for Korean Legal QA. Journal of The Korea Society of Computer and Information, 30(8), 53-63.
Jun-Won Seo; Junghye Min. Optimization of a Hybrid RAG System for Korean Legal QA. Journal of The Korea Society of Computer and Information. 2025; 30(8) 53-63.
Jun-Won Seo, Junghye Min. Optimization of a Hybrid RAG System for Korean Legal QA. 2025; 30(8), 53-63.
Jun-Won Seo and Junghye Min. "Optimization of a Hybrid RAG System for Korean Legal QA" Journal of The Korea Society of Computer and Information 30, no.8 (2025) : 53-63.
