work TOPIK Automatic Writing Assessment Research and development of an automated scoring system for the TOPIK (Test of Proficiency in Korean) writing section, with multi-trait scoring and rationale generation. TOPIK Item Similarity Analysis & Auto-Generation Research on automatic item similarity analysis and generation algorithms for the TOPIK test, leveraging aspect-wise semantic similarity and faceted query-by-example retrieval. Korean Voice Data Construction for Language Education Construction and validation of a Korean speech dataset from Western and Asian language native speakers, supporting language education research. Digital Therapeutics for Autism Spectrum Disorder Development of a contextual assessment model to assist the linguistic development of children with autism spectrum disorder (ASD). TOPIK IBT Intelligent Evaluation & Scoring System Development of a comprehensive automated scoring framework for TOPIK IBT writing tasks, tailored for non-native Korean language learners.