상호정보량의 정규화에 대한 연구

이재윤

Abstract

Mutual information, as an association measure, has been used for various purposes as well as for calculating term similarity. There are, however, some limits in mutual information. It tends to emphasize low frequency terms extremely because the marginal value of mutual information changes inversely to frequency of terms. To compensate for this limit, this study suggests relative mutual information(RMI) coefficients which normalize mutual information, and examines their characteristics in some details. The RMI coefficients also improve effectiveness of global query expansion when they are adapted to three different collections.

keywords: 상호정보량, 상대적 상호정보량 계수, 연관성척도, 정보검색, 질의확장Mutual Information, Relative Mutual Information Coefficients, Association Measures, Information Retrieval, Query Expansion, 상호정보량, 상대적 상호정보량 계수, 연관성척도, 정보검색, 질의확장Mutual Information, Relative Mutual Information Coefficients, Association Measures, Information Retrieval, Query Expansion

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Journal of the Korean Society for Library and Information Science

Article Contents

Vol.37 No.4

Abstract

Journal of the Korean Society for Library and Information Science