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Department of Biomedical Engineering, College of Medicine, Seoul National University, Seoul 110-799, sbinhan@snu.ac.kr Abstract: The Metathesaurus of the Unified Medical Language System (UMLS MT) is one of the most useful and largest thesaurus to develop conceptual information retrieval system. This papers shows how the Metathesaurus can improve the retrieval performance for medical records and what requirements must consider to get best performance when we are going to adapt the Metathesaurus. We examined the retrieval performance of expanded query by the Metathesaurus with selected 4 original query in 5000 braintest results as a test collection. The Metatheasaurus for query expansion, our experiment results reveal that Metatheasaurus increase the retrieval performance than pure string match for retrieving relevant medical records. It is also however, required lexical processing such as stemming, phrase separation into each words. We has suggested the use of Metatheasaurus for retrieval effectiveness by query expansion. Keyword: UMLS, Metathesaurus, query expansion, retrieval performance, information retrieval(IR) system>5. 񈂬 aQɡe i (indexing) aa A e aa iae awa a̩A wA e i aaa awa aw Aae ii aa. we i A ae i aa a⸡ aA xaea ae i wae awai aw ⸥ aawСe, We 񈂬 aQɡa 100% ѡ eIi i i e a. a Ae , awa a AAa ae w w e 񈂬A gea. , 񈂬aСa ae A e e ae awae a a aA ae i baeA eЁa a[1]. aa 񈂬aIi wae wae ai awaa (original query)i waa 񈂬ae a. e⸥ ae aa a {a ue awAe ae eii a e i iea[2]. aСe 񈂬i ᶁ awAe ae ᴅ aa i e ɉ⸥ ʼni aaȁe aa , w, a, ʼneA ʼne a wA a. aa 񈂬aQAᬁ ae a awai {e qi ᬡ aaA awi e i iaeA Awaa I eIi waa. ^