본 연구는 한국어 에세이 자동 평가(AES) 성능 향상을 위해 2 종 한국어 에세이 데이터셋(국립
국어원 글쓰기 채점 말뭉치, 한국어 학습자 말뭉치)에 대해 사전학습 언어모델 기반 자동 채점 모
델을 구축하고 2 단계 LoRA 미세조정(Two-Stage Fine-Tuning with LoRA) 및 점수 정렬 기법(Score
Alignments, SA)의 효과를 비교·분석하였다. mBERT, KoBERT, KoELECTRA, Funnel-Kor 4 개의 사전학
습 언어모델을 적용하여 5-fold 교차검증으로 QWK 를 계산해 성능 평가한 결과, baseline 대비 LoRA
와 SA 를 함께 적용한 경우 대부분의 모델에서 최고 성능을 달성하였다. 또한, 한국어 학습자 말뭉
치에서 Holistic 0.694, 글쓰기 채점 말뭉치에서 0.655 로 Funnel-Kor 에서 baseline 대비 각각
0.155, 0.054 향상되는 우수한 성능을 보였다. 본 연구는 공개 데이터 중심으로 제한되었던 기존
한국어 AES 연구 범위를 확장하고, 데이터 조건에 따른 모델 성능 편차를 정량적으로 제시한다.
KSP Keywords
Two-Stage, fine-tuning, score alignment
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