Search (6 results, page 1 of 1)

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Abstract

COPAC (CURL OPAC) is a union catalogue, based on records supplied by members of the Consortium of University Libraries (CURL), giving access to the online catalogue records of some of the largest academic research libraries in the UK and Ireland. Like all union catalogues, COPAC is supplied with multiple copies of records representing the same document in the contributing library catalogues. To reduce the level of duplication visible to the COPAC user, duplicate detection and record consolidation procedures have been developed. These result in the production of a single record for each document, representing the holdings of several libraries. Discusses the ways in which both the duplicate detection and record consolidation procedures are carried out, and problem areas encountered. Describes the general structure of these procedures, providing a model of the duplicate record handling mechanisms used in COPAC

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Abstract

As part of a recent research project a large set of catalogue users' subject queries was collected by interview. The libraries and the data collection procedures are briefly described. The query set obtained has been divided into several general categories which illustrate the range of of types of subject search being performed. Each category of query is discussed, with a consideration of the problem which face the user in carrying out each type of search. Possible solutions to some of these problems are considered. The most important issue is the variation in specifity of the queries, whilst other issues relate to the users' expression of need, access to specific types of materials, interdisciplinary subjects, and inappropriate queries. These issues are summarised and the implications for OPAC design are discussed

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Abstract

With increasing moves towards an integrated Europe the need for multilingual access to information becomes more pressing. One aspect of this need which has largely been neglected is the provision of multilingual access to OPACs and this paper is concerned with exploring this problem area. The need for multilingual OPAC search capabilities and the difficulties associated with this are discussed. The problems of subject access in particular are highlighted. Research into subject searching in monolingual OPACs is reviewed and its relevance to multilingual OPACs is outlined. Given the limitations of current machine translation of natural language it is likely that the utilisation of controlled subject search facilities. Finally some possible directions for further research are considered

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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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Footnote

Vgl. auch Mowat, I.R.M. in: Online and CD-ROM review 20(1996) no.4