Search (6 results, page 1 of 1)

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Abstract

Subject access in library OPACs might be improved for some users by taking advantage of all of the hierarchical relationships which are indicated on existing LCSH entries. Recommends that cross references pointing to broader terms be displayed, in addition to those for narrower and related terms to which users have traditionally benn directed. Traces the old practice back to Charles Cutter, reports on deliberations of the ALCTS Subject Analysis Committee nearly 120 years later. Discusses practical concerns related to implementing the change, including the accuracy of hierarchical relationships in the LCSH system and possible techniques for using the MARC format to generate the cross references

Date

22. 4.1997 20:43:23

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Source

Searcher. 3(1995) no.8, S.18-22

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Abstract

Vorsatz zum Sinn von Normdateien: "Die sachgerechte Nutzung von Normdateien erfordert eine ausgeklügelte Datenbankstruktur, über die sich Bibliothekare und Informatiker offensichtlich erst noch verständigen müssen"; Hauptsatz zur Redundanz von P,T,G,C,K,Z,F - verbale Sacherschließung als Funktion: "Außer den Sachschlagwörtern können alle anderen Schlagwortkategorien der RSWK/SWD 'eingespart', auf die Einrichtung eigener Schlagwortkettenfelder in den Titelaufnahmen kann verzichtet werden: Nachsatz zur 'Kombinatorik': "An die Stelle von Schlagwortketten würden Chiffren für Verknüpfungskombinationen ('Kombinationsmuster') treten, die auch im Sinne von Steuerungsinstrumenten zu nutzen wären"

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Abstract

Experimental evidence suggests that enhancing the subject content of OPAC records can improve retrieval performance. This is based on the use of natural language index terms derived from the table of contents and back-of-the-book index of documents. The research reported here investigates the alternative approach of translating these natural language terms into controlled vocabulary. Subject queries were collected by interview at the catalogue, and indexing of the queries demonstrated the impressive ability of PRECIS, and to a lesser extent LCSH, to represent users' information needs. DDC performed poorly in this respect. The assumption was made that an index language adequately specific to represent users' queries should be adequate to represent document contents. Searches were carried out on three test databases, and both natural language and PRECIS enhancement of MARC records increased the number of relevant documents found, with PRECIS showing the better performance. However, with weak stemming the advantage of PRECIS was lost. Consideration must also be given to the potential advantages of controlled vocabulary, over and above basic retrieval performance measures

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Date

22. 9.1997 19:16:05

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Date

15. 7.2018 16:22:16

Footnote

Rez. in: Mitteilungen VÖB 48(1995) H.1, S.66-68 (K. Niedermair) - Vgl. auch Lepsky, K. in: Bibliotheksdienst 29(1995) H.3, S.500-519; Bibliothek: Forschung u. Praxis 19(1995) H.2, S.251-254 (G. Hartwieg; auch in: LDV-Forum Bd. 12, Nr. 2, Jg. 1995, S.22-29 [unter: http://www.jlcl.org/1995_Heft2/Rezensionen_19-27.pdf]) .