Search (21 results, page 1 of 2)

  • × theme_ss:"OPAC"
  • × year_i:[2000 TO 2010}
  1. Li, Y.-O.; Leung, S.W.: Computer cataloging of electronic Journals in unstable Aggregator Databases the Hong Kong Baptist University Library experience (2001) 0.06 
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    Date
    10. 9.2000 17:38:22
    Theme
    Elektronische Dokumente
  2. Oberhauser, O.; Labner, J.: Relevance Ranking in Online-Katalogen : Informationsstand und Perspektiven (2003) 0.03 
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    Abstract
    Bekanntlich führen Suchmaschinen wie Google &Co. beider Auflistung der Suchergebnisse ein "Ranking" nach "Relevanz" durch, d.h. die Dokumente werden in absteigender Reihenfolge entsprechend ihrer Erfüllung von Relevanzkriterien ausgeben. In Online-Katalogen (OPACs) ist derlei noch nicht allgemein übliche Praxis, doch bietet etwa das im Österreichischen Bibliothekenverbund eingesetzte System Aleph 500 tatsächlich eine solche Ranking-Option an (die im Verbundkatalog auch implementiert ist). Bislang liegen allerdings kaum Informationen zur Funktionsweise dieses Features, insbesondere auch im Hinblick auf eine Hilfestellung für Benutzer, vor. Daher möchten wir mit diesem Beitrag versuchen, den in unserem Verbund bestehenden Informationsstand zum Thema "Relevance Ranking" zu erweitern. Sowohl die Verwendung einer Ranking-Option in OPACs generell als auch die sich unter Aleph 500 konkret bietenden Möglichkeiten sollen im folgenden näher betrachtet werden.
  3. DBV-Rechtskommission: Kataloganreicherung mit Schutzumschlagabbildungen (2006) 0.02 
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    Footnote
    Für weitere Informationen: http://www.bibliotheksverband.de/ko-recht/dokumente/20060427.html.
  4. Hauer, M.: Neue OPACs braucht das Land ... dandelon.com (2006) 0.02 
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    Abstract
    In dandelon.com werden im Gegensatz zu den bisherigen Federated Search-Portal-Ansätzen die Titel von Medien neu mittels intelligentCAPTURE dezentral und kollaborativ erschlossen und inhaltlich stark erweitert. intelligentCAPTURE erschließt maschinell bisher Buchinhaltsverzeichnisse, Bücher, Klappentexte, Aufsätze und Websites, übernimmt bibliografische Daten aus Bibliotheken (XML, Z.39.50), von Verlagen (ONIX + Cover Pages), Zeitschriftenagenturen (Swets) und Buchhandel (SOAP) und exportierte maschinelle Indexate und aufbereitete Dokumente an die Bibliothekskataloge (MAB, MARC, XML) oder Dokumentationssysteme, an dandelon.com und teils auch an Fachportale. Die Daten werden durch Scanning und OCR, durch Import von Dateien und Lookup auf Server und durch Web-Spidering/-Crawling gewonnen. Die Qualität der Suche in dandelon.com ist deutlich besser als in bisherigen Bibliothekssystemen. Die semantische, multilinguale Suche mit derzeit 1,2 Millionen Fachbegriffen trägt zu den guten Suchergebnissen stark bei.
  5. Schneider, R.: OPACs, Benutzer und das Web (2009) 0.01 
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    Date
    22. 2.2009 18:50:43
  6. Braschoß, K.; Hansmann, S.; Hesse, T.; Joosten-Wilke, U.; Ristau, R.; Rusch, B.; Taylor, V.: Indexierung von Online-Katalogen : Ein gemeinsames Konzept der ALEPH-Anwender in Berlin (2004) 0.01 
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    Abstract
    1. Einleitung Der Online-Katalog einer Bibliothek (auch als OPAC oder Online Public Access Catalog bezeichnet) muss sich in unterschiedlichen Szenarien bewähren. Er muss präzise gestellte Suchanfragen, die mit exakten Suchstrings arbeiten, genauso bedienen wie weite Suchen mit angenäherten Termen. In beiden Fällen erwartet der Benutzer relevante Ergebnisse. Die Relevanz eines Rechercheergebnisses wird in klassischen Retrievalsystemen wie einem BibliotheksOPAC im Allgemeinen mit den Größen "Precision" und "Recall" gemessen. Dabei steht "Precision" für die Genauigkeit und "Recall" für die Vollständigkeit der erzielten Einträge. In diesem Balanceakt zwischen der gewünschten Precision und dem Recall spielt die gewählte Indexierungsmethode in der Bibliotheksdatenbank eine entscheidende Rolle. Unberührt davon bleiben fortgeschrittene Retrievaltechniken wie linguistische Verfahren. Mit der Indexierungsmethode wird, allgemein ausgedrückt, die Repräsentation der Dokumente - in diesem Fall der in der Bibliothek vorhandenen Medien - für die Suche festgelegt. Diese beginnt mit der Erfassung von Katalogdaten, aus denen die Indexeinträge gewonnen werden. Hier hat man es in der Regel mit hoch differenzierten Datensätzen zu tun, die besonders wertvoll sind, wenn sie im Bereich von Personennamen, Körperschaftsnamen und Schlagwörtern mit Normdatensätzen arbeiten. Normdatensätze gewährleisten einerseits ein kontrolliertes Vokabular und gleichzeitig Verweisungsformen, die ebenso für die Indexierung nutzbar gemacht werden können. Damit sind die Bedingungen für relevante Ergebnismengen im Sinne von "Precision" und "Recall" günstig. Entsprechend ungünstig wirken sich so genannte Kurztitel aus, die in großer Zahl im Zuge von Retrokonversionsprojekten entstanden sind. Diese rudimentären Titelaufnahmen liefern nur eine begrenzte Menge an Indexeinträgen und weisen in der Regel keine Verknüpfungen zu Normdaten auf.
  7. Horn, M.E.: "Garbage" in, "refuse and refuse disposal" out : making the most of the subject authority file in the OPAC (2002) 0.01 
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    Date
    10. 9.2000 17:38:22
  8. Beccaria, M.; Scott, D.: Fac-Back-OPAC : an open source interface to your library system (2007) 0.01 
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    Date
    17. 8.2008 11:22:47
  9. Moulaison, H.L.: OPAC queries at a medium-sized academic library : a transaction log analysis (2008) 0.01 
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    Date
    10. 9.2000 17:38:22
  10. Lam, V.-T.: Enhancing subject access to monographs in Online Public Access Catalogs : table of contents added to bibliographic records (2000) 0.01 
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    Date
    22. 9.1997 19:16:05
  11. Hubrich, J.: Input und Output der Schlagwortnormdatei (SWD) : Aufwand zur Sicherstellung der Qualität und Möglichkeiten des Nutzens im OPAC (2005) 0.01 
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    Date
    30. 1.2007 18:22:15
  12. Golderman, G.M.; Connolly, B.: Between the book covers : going beyond OPAC keyword searching with the deep linking capabilities of Google Scholar and Google Book Search (2004/05) 0.01 
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    Date
    2.12.2007 19:39:22
  13. Rädler, K.: Kataloganreicherung mit digitalen Inhaltsverzeichnissen eröffnet neue Geschäftsfelder : Erfahrungen aus der Vorarlberger Landesbibliothek (2008) 0.01 
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    Date
    22. 6.2008 17:14:24
  14. Blosser, J.; Michaelson, R.; Routh. R.; Xia, P.: Defining the landscape of Web resources : Concluding Report of the BAER Web Resources Sub-Group (2000) 0.01 
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    Date
    21. 4.2002 10:22:31
  15. Thomas, D.H.: ¬The effect of interface design on item selection in an online catalog (2001) 0.01 
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    10. 9.2000 17:38:22
  16. Ikas, W.-V.; Litten, F.: World Wide Web und Catalogue Enrichment : Möglichkeiten des verbesserten Nachweises von mikroverfilmten Handschriften und Inkunabeln (2007) 0.01 
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    22. 5.2007 11:19:21
  17. Greifeneder, E.: Hilfe auf allen Ebenen : ein Beitrag zur Forschung über Online-Hilfen in OPACs (2008) 0.01 
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    22. 6.2008 13:29:15
  18. Hahn, U.; Schulze, M.: Katalogerweiterungen, Mashups und Elemente der Bibliothek 2.0" in der Praxis : der Katalog der Universitätsbibliothek der Helmut-Schmidt-Universität (IHSU) Universität der Bundeswehr Hamburg (2009) 0.01 
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    22. 2.2009 19:40:38
  19. Saving the time of the library user through subject access innovation : Papers in honor of Pauline Atherton Cochrane (2000) 0.01 
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    22. 9.1997 19:16:05
  20. Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004) 0.01 
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    Source
    Electronic library. 22(2004) no.2, S.112-120

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  • e 10

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