Search (104 results, page 6 of 6)

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Source

Journal of the American Society for Information Science. 37(1986), S.57-70

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Source

Information technology and libraries. 8(1989) no.2, S.146-160

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Abstract

Contribution to a thematic issue devoted to subject control in on-line catalogues. In contrast with data base searching, the use of an OPAC is direct, without intermediaries and without prior training. This tool allows decentralised information access, 1st in the library and now directly from users' homes. In France MINITEL has made distributed access possible. Outlines the French authority list, RAMEAU (Répertoire d'Autorité Matière Encyclopédique et Alphabétique Unifié) giving details or its users and describes searching the system and the search software, ALEXIS. ALEXIS can serve as an example of the direction to take since it was developed within the perspective of natural language queries.

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Abstract

Central to subject searching is the match between user vocabulary and the headings from Library of Congress Subject-Headings (LCSH) used in a library catalog. This paper evaluates previous matching studies, proposes a detailed list of matching categories, and tests LCSH in a study using these categories. Exact and partial match categories are defined for single LCSH and multiple LCSH matches to user expressions. One no-match category is included. Transaction logs from ORION, UCLA's online Information system, were used to collect user expressions for a comparison of LCSH and user language. Results show that single LCSH headings match user expressions exactly about 47% of the time; that single subject heading matches, including exact matches, comprise 74% of the total; that partial matches, to both single and multiple headings, comprise about 21% of the total; and that no match occurs 5% of the time.