Library and Information Science

Library and Information Science ISSN: 2435-8495
三田図書館・情報学会 Mita Society for Library and Information Science
〒108‒8345 東京都港区三田2‒15‒45 慶應義塾大学文学部図書館・情報学専攻内 c/o Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan
Library and Information Science 26: 89-102 (1988)

原著論文Original Article

PRECISオペレータの一貫性自然言語の意味的役割を検討の基礎としてConsistency of PRECIS operators : Viewing from the concept of semantic roles of natural language

学術情報センター助手Research Associate, National Center for Science Information System ◇ 〒112-0012 東京都文京区大塚三丁目29番1号 ◇ Otsuka 3-29-1, Bunkyo-ku, Tokyo 112-0012, Japan

受付日:1988年9月30日Received: September 30, 1988
発行日:1989年3月25日Published: March 25, 1989

Validity of PRECIS largely depends upon its operators. But the theoretical foundation of the operators is ambiguous, and the systematic examination of operators’ consistency has not yet been made.

The purpose of this paper is to examine the consistency of operators, For the purpose, subjects expressed in noun phrase form were classified according to its semantic role structure, and corresponding input string were examined.

The main findings are as follows: (1) Operator “2” has two functions, one is to indicate the subject’s main concept, and the other is to indicate whether the term is an action concept or a thing concept. Therefore, it sometimes causes conflict with other operators. (2) The application range of operator “p” is not clear, thus “p” conflicts with other operators in some cases. (3) Operator “3” is sometimes used to represent more than one semantic roles in a subject.

Because of these problems, assignment of operators is sometimes subjective and lacks consistency, and one of operators’ functions, to regulate the order of terms in the index entry, does not work well.

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