Search (1205 results, page 1 of 61)

  • × theme_ss:"OPAC"
  1. Horn, M.E.: "Garbage" in, "refuse and refuse disposal" out : making the most of the subject authority file in the OPAC (2002) 0.08 
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    Abstract
    Subject access in the OPAC, as discussed in this article, is predicated on two different kinds of searching: subject (authority, alphabetic, or controlled vocabulary searching) or keyword (uncontrolled, free text, natural language vocabulary). The literature has focused on demonstrating that both approaches are needed, but very few authors address the need to integrate keyword into authority searching. The article discusses this difference and compares, with a query on the term garbage, search results in two online catalogs, one that performs keyword searches through the authority file and one where only bibliographic records are included in keyword searches.
    Date
    10. 9.2000 17:38:22
    Type
    a
  2. Alonso Lifante, M.P.; Molero Madrid, F.J.: Enhancing OPAC records : evaluating and fitting within cataloguing standards a new proposal of description parameters for historical astronomical resources (2015) 0.07 
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    Abstract
    Enhancing content description of specialized resources, particularly astronomical resources, is a matter that is still unresolved in library and information science. In this paper, the authors outline deficiencies in some fields and elements of cataloging standards for description of historical astronomical resources, mainly star atlases and catalogs. Furthermore, they review their recent proposal of astronomical parameters for a better description and propose an approach for accommodating these parameters in the current criteria of MARC 21, the International Standard Bibliographic Description, and Resource Description and Access. Fourteen new parameters are considered, and recommendations are provided to standards developers for the addition of elements to accommodate attributes of celestial cartographic resources. This would improve bibliographic records for such resources in astronomical libraries' OPACs, which will have a beneficial effect on information retrieval.
    Date
    10. 9.2000 17:38:22
    Type
    a
  3. Walker, S.: Improving subject access painlessly : recent work on the Okapi online catalogue projects (1988) 0.06 
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    Source
    Program. 22(1988), S.21-31
    Type
    a
  4. Hug, H.; Nöthiger, R.: ETHICS: an online public access catalogue at ETH-Bibliothek, Zürich (1988) 0.06 
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    Source
    Program. 22(1988), S.133-142
    Type
    a
  5. Mitev, N.; Hildreth, C.R.: ¬Les catalogues interactifs en Grande-Bretagne et aux Etats-Unis (1989) 0.06 
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    Source
    Bulletin des bibliothèques de France. 34(1989) no.1, S.22-47
    Type
    a
  6. Wagner, H.: OPAC für jedermann? (1993) 0.06 
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    Footnote
    Eine Replik zu Auer: OPAC und Zeichensatz (Mitteilungen der VÖB 46(1993) H.2, S.21-22)
    Type
    a
  7. Auer, G.: Online-Kataloge und Zeichensatz (1993) 0.06 
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    Source
    Mitteilungen der Vereinigung Österreichischer Bibliothekare. 46(1993) H.2, S.21-22
    Type
    a
  8. Riesthuis, G.J.A.; Stuurman, P.: Tendenzen in de onderwerpsontsluiting : T.4: Onderwerpsontsluiting en on-line catalogi (1990) 0.06 
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    Source
    Open. 22(1990) no.10, S.326-330
    Type
    a
  9. Ostendorp, C.; Trinks-Schulz, H.: Integriertes Bibliothekssystem BABSY/i3v an der Hochschulbibliothek der Fachhochschule Gelsenkirchen (1999) 0.06 
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    Date
    23. 3.2000 15:22:58
    Type
    a
  10. Wimmer, W.: Multimedia-Angebote im Bibliothekskatalog : Neue Möglichkeiten durch das ALLEGRO-Programm ALCARTA (1999) 0.05 
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    Date
    22. 1.2000 19:36:10
    22. 1.2000 19:41:58
    Type
    a
  11. Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004) 0.05 
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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."
    Source
    Electronic library. 22(2004) no.2, S.112-120
    Type
    a
  12. Wimmer, W.: Mit dem 'Surfbrett' in die Bibliothek : der World-Wide-Web Katalog der Bibliothek der Friedrich-Ebert-Stiftung (1996) 0.05 
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    Date
    22. 4.1996 20:07:57
    Type
    a
  13. Recker, I.; Ronthaler, M.; Zillmann, H.: OSIRIS - Osnabrück Intelligent Research Information System : ein Hyperbase Front End System für OPACs (1996) 0.05 
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    Date
    22. 4.1996 20:07:57
    Type
    a
  14. Saving the time of the library user through subject access innovation : Papers in honor of Pauline Atherton Cochrane (2000) 0.05 
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    Abstract
    Pauline Atherton Cochrane has been contributing to library and information science for fifty years. Think of it-from mid-century to the millennium, from ENIAC (practically) to Internet 11 (almost here). What a time to be in our field! Her work an indexing, subject access, and the user-oriented approach had immediate and sustained impact, and she continues to be one of our most heavily cited authors (see, JASIS, 49[4], 327-55) and most beloved personages. This introduction includes a few words about my own experiences with Pauline as well as a short summary of the contributions that make up this tribute. A review of the curriculum vita provided at the end of this publication Shows that Pauline Cochrane has been involved in a wide variety of work. As Marcia Bates points out in her note (See below), Pauline was (and is) a role model, but I will always think of her as simply the best teacher 1 ever had. In 1997, I entered the University of Illinois Graduate School of Library and Information Science as a returning mid-life student; my previous doctorate had not led to a full-time job and I was re-tooling. I was not sure what 1 would find in library school, and the introductory course attended by more than 100 students from widely varied backgrounds had not yet convinced me I was in the right place. Then, one day, Pauline gave a guest lecture an the digital library in my introductory class. I still remember it. She put up some notes-a few words clustered an the blackboard with some circles and directional arrows-and then she gave a free, seemingly extemporaneous, but riveting narrative. She set out a vision for ideal information exchange in the digital environment but noted a host of practical concerns, issues, and potential problems that required (demanded!) continued human intervention. The lecture brought that class and the entire semester's work into focus; it created tremendous excitement for the future of librarianship. 1 saw that librarians and libraries would play an active role. I was in the right place.
    Content
    Enthält Beiträge von: FUGMANN, R.: Obstacles to progress in mechanized subject access and the necessity of a paradigm change; TELL, B.: On MARC and natural text searching: a review of Pauline Cochrane's inspirational thinking grafted onto a Swedish spy on library matters; KING, D.W.: Blazing new trails: in celebration of an audacious career; FIDEL, R.: The user-centered approach; SMITH, L.: Subject access in interdisciplinary research; DRABENSTOTT, K.M.: Web search strategies; LAM, V.-T.: Enhancing subject access to monographs in Online Public Access Catalogs: table of contents added to bibliographic records; JOHNSON, E.H.: Objects for distributed heterogeneous information retrieval
    Date
    22. 9.1997 19:16:05
  15. Hogan, S.A.: Educating users about catalogues and cataloguing : the impossible dream (1993) 0.04 
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    Abstract
    Catalogue use studies in manual and online environments over the last 50 years have been succesful in identifying user behaviour and causes of user failure, but they have not led to substantial change in catalogue codes of practices. The online environment offers a myriad of new challenges
    Source
    International cataloguing and bibliographic control. 22(1993) no.2, S.23-26
    Type
    a
  16. Walker, S.: ¬The Okapi online catalogue research projects (1989) 0.04 
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    Date
    16. 8.1998 11:22:08
    Type
    a
  17. Sandlian, P.: Rethinking the rules (1995) 0.04 
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    Abstract
    Rules regarding cataloguing, subject headings, the way information in bibliographic records is organised and the catalogue's interface, or the way the screen is set up, are barriers to the use of online catalogues by children Describes the background to and implementation of a project to create a child orientation catalogue with a graphical user interface, or one that relies on pictures instead of text, within Denver Public Library in Colorado. Now called the Kid's catalog and commercially available from the Colorado Alliance of Research Libraries Co., the catalogue's software acts as a front end to a library's regular catalogue
    Source
    School library journal. 41(1995) no.7, S.22-25
    Type
    a
  18. Sharma, A.: ¬The Z39.50 information retrieval protocol (1998) 0.04 
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    Abstract
    Reports results of the work of a new member of the ELINOR project team to review the development taking place in Z39.50 networked information retrieval protocol with a view to bringing the University's electronic library pilot systems, including ELINOR and the online catalogue into a single, unified system. Focuses particularly on the WWW client server environment
    Series
    British Library Research and Innovation Centre (BLRIC) report; 22
    Source
    ELINOR: Electronic Library Project. Ed.: A. Ramsden
    Type
    a
  19. Hancock-Beaulieu, M.: Searching behaviour and the evaluation of online catalogues (1991) 0.04 
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    Abstract
    Presents a brief report on a study, carried out by the Centre for Interactive Systems Research, City University, to investigate the techniques used for evaluating OPACs: to explore and assess different data gathering methods in studying information seeking behaviour at the on-line catalogue; and to examine how a transaction logging facility could be enhanced to serve as a more effective diagnostic tool. For a full report see British Library research paper 78
    Pages
    S.20-22
    Type
    a
  20. Porter, M.; Galpin, V.: Relevance feedback in a public access catalogue for a research library : Muscat at the Scott Polar Research Institute (1988) 0.04 
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    Abstract
    This paper reports on the successful introduction of a sophisticated online catalogue system at the library of the Scott Polar Research Institute, Cambridge, using the Muscat program package. The system provides to both end-users and library staff a choice between boolean searching on keywords and access using relevance feedback based on free text in English, mixed with UDC classification numbers. The system is implemented on an IBM 3084 computer. Significant benefits from the application of relevance feedback are reported with 10,000 records on file.
    Source
    Program. 22(1988), S.1-20
    Type
    a

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