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  • × theme_ss:"OPAC"
  1. Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004) 0.20 
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    Abstract
    A relevancy-ranking algorithm for a natural language interface to Boolean online public access catalogs (OPACs) was formulated and compared with that currently used in a knowledge-based search interface called the E-Referencer, being developed by the authors. The algorithm makes use of seven weIl-known ranking criteria: breadth of match, section weighting, proximity of query words, variant word forms (stemming), document frequency, term frequency and document length. The algorithm converts a natural language query into a series of increasingly broader Boolean search statements. In a small experiment with ten subjects in which the algorithm was simulated by hand, the algorithm obtained good results with a mean overall precision of 0.42 and mean average precision of 0.62, representing a 27 percent improvement in precision and 41 percent improvement in average precision compared to the E-Referencer. The usefulness of each step in the algorithm was analyzed and suggestions are made for improving the algorithm.
    Content
    "Most Web search engines accept natural language queries, perform some kind of fuzzy matching and produce ranked output, displaying first the documents that are most likely to be relevant. On the other hand, most library online public access catalogs (OPACs) an the Web are still Boolean retrieval systems that perform exact matching, and require users to express their search requests precisely in a Boolean search language and to refine their search statements to improve the search results. It is well-documented that users have difficulty searching Boolean OPACs effectively (e.g. Borgman, 1996; Ensor, 1992; Wallace, 1993). One approach to making OPACs easier to use is to develop a natural language search interface that acts as a middleware between the user's Web browser and the OPAC system. The search interface can accept a natural language query from the user and reformulate it as a series of Boolean search statements that are then submitted to the OPAC. The records retrieved by the OPAC are ranked by the search interface before forwarding them to the user's Web browser. The user, then, does not need to interact directly with the Boolean OPAC but with the natural language search interface or search intermediary. The search interface interacts with the OPAC system an the user's behalf. The advantage of this approach is that no modification to the OPAC or library system is required. Furthermore, the search interface can access multiple OPACs, acting as a meta search engine, and integrate search results from various OPACs before sending them to the user. The search interface needs to incorporate a method for converting the user's natural language query into a series of Boolean search statements, and for ranking the OPAC records retrieved. The purpose of this study was to develop a relevancyranking algorithm for a search interface to Boolean OPAC systems. This is part of an on-going effort to develop a knowledge-based search interface to OPACs called the E-Referencer (Khoo et al., 1998, 1999; Poo et al., 2000). E-Referencer v. 2 that has been implemented applies a repertoire of initial search strategies and reformulation strategies to retrieve records from OPACs using the Z39.50 protocol, and also assists users in mapping query keywords to the Library of Congress subject headings."
    Object
    E-Referencer
    Source
    Electronic library. 22(2004) no.2, S.112-120
  2. Walker, S.: Improving subject access painlessly : recent work on the Okapi online catalogue projects (1988) 0.02 
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    Source
    Program. 22(1988), S.21-31
  3. Hug, H.; Nöthiger, R.: ETHICS: an online public access catalogue at ETH-Bibliothek, Zürich (1988) 0.02 
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    Source
    Program. 22(1988), S.133-142
  4. Wimmer, W.: Multimedia-Angebote im Bibliothekskatalog : Neue Möglichkeiten durch das ALLEGRO-Programm ALCARTA (1999) 0.02 
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    Date
    22. 1.2000 19:36:10
    22. 1.2000 19:41:58
  5. Mitev, N.; Hildreth, C.R.: ¬Les catalogues interactifs en Grande-Bretagne et aux Etats-Unis (1989) 0.02 
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    Source
    Bulletin des bibliothèques de France. 34(1989) no.1, S.22-47
  6. Wagner, H.: OPAC für jedermann? (1993) 0.02 
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    Footnote
    Eine Replik zu Auer: OPAC und Zeichensatz (Mitteilungen der VÖB 46(1993) H.2, S.21-22)
  7. Auer, G.: Online-Kataloge und Zeichensatz (1993) 0.02 
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    Source
    Mitteilungen der Vereinigung Österreichischer Bibliothekare. 46(1993) H.2, S.21-22
  8. Riesthuis, G.J.A.; Stuurman, P.: Tendenzen in de onderwerpsontsluiting : T.4: Onderwerpsontsluiting en on-line catalogi (1990) 0.02 
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    Source
    Open. 22(1990) no.10, S.326-330
  9. Ostendorp, C.; Trinks-Schulz, H.: Integriertes Bibliothekssystem BABSY/i3v an der Hochschulbibliothek der Fachhochschule Gelsenkirchen (1999) 0.02 
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    Date
    23. 3.2000 15:22:58
  10. Wimmer, W.: Mit dem 'Surfbrett' in die Bibliothek : der World-Wide-Web Katalog der Bibliothek der Friedrich-Ebert-Stiftung (1996) 0.01 
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    Date
    22. 4.1996 20:07:57
  11. Recker, I.; Ronthaler, M.; Zillmann, H.: OSIRIS - Osnabrück Intelligent Research Information System : ein Hyperbase Front End System für OPACs (1996) 0.01 
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    Date
    22. 4.1996 20:07:57
  12. Hogan, S.A.: Educating users about catalogues and cataloguing : the impossible dream (1993) 0.01 
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    Source
    International cataloguing and bibliographic control. 22(1993) no.2, S.23-26
  13. Walker, S.: ¬The Okapi online catalogue research projects (1989) 0.01 
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    Date
    16. 8.1998 11:22:08
  14. Cherry, J.M.; Clinton, M.: ¬An experimental investigation of two types of instruction for OPAC users (1991) 0.01 
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    Source
    Canadian journal of information science. 16(1991) no.4, S.2-22
  15. McLachlan, R.W.: Public libraries : shrinking dollars, increased demands; clerical staff and OCLC to the rescue (1991) 0.01 
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    Source
    OCLC micro. 7(1991) no.6, S.19-22
  16. Seruga, J.: Object-oriented modeling of a library information system (1997) 0.01 
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    LASIE. 28(1997) no.4, S.22-34
  17. Online-Benutzerkataloge : Vergleich von OPACs mit Ausleihfunktionen an deutschen Universitätsbibliotheken (1994) 0.01 
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    Isbn
    3-924659-22-2
  18. Schweikl, G.: ¬Die Pilotierung des SISIS-OPAC-ONL V 1.0 an der Universitätsbibliothek Regensburg (1994) 0.01 
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    Bibliotheksforum Bayern. 22(1994) H.3, S.358-376
  19. Sandlian, P.: Rethinking the rules (1995) 0.01 
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    School library journal. 41(1995) no.7, S.22-25
  20. Porter, M.; Galpin, V.: Relevance feedback in a public access catalogue for a research library : Muscat at the Scott Polar Research Institute (1988) 0.01 
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    Program. 22(1988), S.1-20

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