Search (60 results, page 3 of 3)

  • × theme_ss:"Verbale Doksprachen im Online-Retrieval"
  • × year_i:[1990 TO 2000}
  1. Ralston, N.M.: Controlled vocabularies for MEDLARS databases (1995) 0.00 
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    Abstract
    For many years, searching medical and health-related topics has caused thousands of searchers to consult the well-known Medical Subject Headings (MeSH) controlled vocabulary. This plan works well for searching MEDLINE, but what about the MEDLARS databases such as TOXLIT, BIOETHICSLINE and POPLINE? Several printed vocabularies are available for searchers who wish to benefit from the consistency afforded by consulting established term lists. Occasionally, use of keywords from vocabularies other than MeSH is recommended even when information in the database is also indexed to MeSH. Search techniques available for use with several of the controlled vocabularies which are discussed vary, but built-in consistency of term use is a continuing theme from one controlled vocabulary to another
    Type
    a
  2. Drabenstott, K.M.; Weller, M.S.: ¬The exact-display approach for online catalog subject searching (1996) 0.00 
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    Abstract
    Introducess a new approach to display retrieved subject headings in subject searching designed to encourage users to browse bibliographic information. Emphasizes the importance of the exact display approach by showing how many user queries could be candidates for this approach, demonstrates an implementation of the exact-display approach in an experimental online catalogue. End user experiences gives opportunities to make recommendations for enhancing the original design of the exact display approach so that future implementations of this approach in operational online catalogues are responsive to the needs of online catalogue users
    Type
    a
  3. Connell, T.H.: Use of the LCSH system : realities (1996) 0.00 
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    Abstract
    Explores the question of whether academic libraries keep up with the changes in the LCSH system. Analysis of the handling of 15 subject headings in 50 academic library catalogues available via the Internet found that libraries are not consistently maintaining subject authority control, or making syndetic references and scope notes in their catalogues. Discusses the results from the perspective of the libraries' performance, performance on the headings overall, performance on references, performance on the type of change made to the headings,a nd performance within 3 widely used onlien catalogue systems (DRA, INNOPAC and NOTIS). Discusses the implications of the findings in relationship to expressions of dissatisfaction with the effectiveness of subject cataloguing expressed by discussion groups on the Internet
    Type
    a
  4. Turquet, B.: Que faire de Rameau? : Ou comment faire avec Rameau? (1997) 0.00 
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    Abstract
    Contribution to the ongoing debate on the French subject headings list RAMEAU, which has been much criticised as time consuming and inflexible. Proposed technical solutions to recurring problems with complex syntax, strucutre of hierarchical and associative links, and rigity of language are discussed, in the context of computerised cataloguing and retrieval using OPACs. As a universal indexing language RAMEAU is more appropriate for medium sized specialised libraries and specialist researchers. However the 2 possible subject indexing techniques, linguistic treatment of whole text and thesaurus, are now beginning to be viewed as complementary approaches
    Type
    a
  5. Lopes, M.I.: Principles underlying subject heading languages : an international approach (1996) 0.00 
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    Abstract
    Discusses the problems in establishing commonly accepted principles for subject retrieval between different bibliographic systems. The Working Group on Principles Underlying Subject Heading Languages was established to devise general principles for any subject retrieval system and to review existing real systems in the light of such principles and compare them in order to evaluate the extent of their coverage and their application in current practices. Provides a background and history of the Working Group. Discusses the principles underlying subject headings and their purposes and the state of the work and major findings
    Type
    a
  6. Cousins, S.A.: Enhancing subject access to OPACs : controlled vocabulary vs. natural language (1992) 0.00 
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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
    Type
    a
  7. McJunkin, M.C.: Precision and recall in title keyword searching (1995) 0.00 
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    Abstract
    Investigates the extent to which title keywords convey subject content and compares the relative effectiveness of searching title keywords using 2 search strategies to examine whether adjacency operators in title keyword searches are effective in improving recall and precision of online searching. Title keywords from a random sample of titles in the field of economics were searched on FirstSearch, using the WorldCat database, which is equivalent in coverage to the OCLC OLUC, with and without adjacency of the keywords specified. The LCSH of the items retrieved were compared with the sample title subject headings to determine the degree of match or relevance and the values for precision and recall were calculated. Results indicated that, when keywords were discipline specific, adjacency operators improved precision with little degradation of recall. Systems that allow positional operators or rank output by proximity of terms may increase search success
    Type
    a
  8. Bodoff, D.; Kambil, A.: Partial coordination : I. The best of pre-coordination and post-coordination (1998) 0.00 
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  9. Wilkens, K.: Drei Sätze zur Idee einer integrierten Formal-und Sacherschließung in Datenbanken (1995) 0.00 
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  10. McIlwaine, I.C.: Subject control : the British viewpoint (1995) 0.00 
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  11. Chan, L.M.: Subject access systems in the USA (1995) 0.00 
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  12. Takeda, N.: Problems in hierarchical structures in thesauri : their influences on the results of information retrieval (1994) 0.00 
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  13. Weidemüller, H.U.: Sinn und Unsinn von Ketten im OPAC (1996) 0.00 
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  14. Bisig, U.: OPAC und verbale Sacherschließung : ein Beitrag zur RSWK-Diskussion (1994) 0.00 
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  15. Aluri, R.D.; Kemp, A.; Boll, J.J.: Subject analysis in online catalogs (1991) 0.00 
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  16. Lepsky, K.: RSWK - und was noch? : Stellungnahme zum Bericht 'Sacherschließung in Online-Katalogen' der Expertengruppe Online-Kataloge (1995) 0.00 
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  17. Studwell, W.E.: Of eggs and baskets : getting more access out of LC Subject Headings in an online environment (1991) 0.00 
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  18. Svenonius, E.: Präkoordination - ja oder nein? (1994) 0.00 
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  19. Poynder, R.: Web research engines? (1996) 0.00 
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  20. Blair, D.C.: Language and representation in information retrieval (1991) 0.00 
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    Abstract
    Information or Document Retrieval is the subject of this book. It is not an introductory book, although it is self-contained in the sense that it is not necessary to have a background in the theory or practice of Information Retrieval in order to understand its arguments. The book presents, as clearly as possible, one particular perspective on Information Retrieval, and attempts to say that certain aspects of the theory or practice of the management of documents are more important than others. The majority of Information Retrieval research has been aimed at the more experimentally tractable small-scale systems, and although much of that work has added greatly to our understanding of Information Retrieval it is becoming increasingly apparent that retrieval systems with large data bases of documents are a fundamentally different genre of systems than small-scale systems. If this is so, which is the thesis of this book, then we must now study large information retrieval systems with the same rigor and intensity that we once studied small-scale systems. Hegel observed that the quantitative growth of any system caused qualitative changes to take place in its structure and processes.

Authors

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  • e 38
  • d 19
  • f 1
  • ja 1
  • nl 1
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  • a 55
  • m 3
  • s 2
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