Document (#24626)

Author

Otto, A.

Title

Ordnungssysteme als Wissensbasis für die Suche in textbasierten Datenbeständen : dargestellt am Beispiel einer soziologischen Bibliographie

Source

Herausforderungen an die Wissensorganisation: Visualisierung, multimediale Dokumente, Internetstrukturen. 5. Tagung der Deutschen Sektion der Internationalen Gesellschaft für Wissensorganisation Berlin, 07.-10. Oktober 1997. Hrsg.: H. Czap u.a

Imprint

Würzburg : Ergon Verlag

Year

1998

Pages

S.249-258

Series

Fortschritte in der Wissensorganisation; Bd.5

Abstract

Es wird eine Methode vorgestellt, wie sich Ordnungssysteme für die Suche in textbasierten Datenbeständen verwenden lassen. "Ordnungssystem" wird hier als Oberbegriff für beliebige geordnete Begriffssammlungen verwendet. Dies sind beispielsweise Thesauri, Klassifikationen und formale Systematiken. Weil Thesauri dabei die leistungsfähigsten Ordnungssysteme sind, finden sie eine besondere Berücksichtigung. Der Beitrag ist streng praxisbezogenen und auf die Nutzerschnittstelle konzentriert. Die Basis für die Nutzerschnittstelle bilden Ordnungssysteme, die über eine WWW-Schnittstelle angeboten werden. Je nach Fachgebiet kann der Nutzer ein spezielles Ordnungssystem für die Suche auswählen. Im Unterschied zu klassischen Verfahren werden die Ordnungssysteme nicht zur ausschließlichen Suche in Deskriptorenfeldern, sondern für die Suche in einem Basic Index verwendet. In der Anwendung auf den Basic Index sind die Ordnungssysteme quasi "entkoppelt" von der ursprünglichen Datenbank und den Deskriptorenfeldern, für die das Ordnungssystem entwickelt wurde. Die Inhalte einer Datenbank spielen bei der Wahl der Ordnungssysteme zunächst keine Rolle. Sie machen sich erst bei der Suche in der Anzahl der Treffer bemerkbar: so findet ein rechtswissenschaftlicher Thesaurus natürlicherweise in einer Medizin-Datenbank weniger relevante Dokumente als in einer Rechts-Datenbank, weil das im Rechts-Thesaurus abgebildete Begriffsgut eher in einer Rechts-Datenbank zu finden ist. Das Verfahren ist modular aufgebaut und sieht in der Konzeption nachgeordnete semantische Retrievalverfahren vor, die zu einer Verbesserung von Retrievaleffektivität und -effizienz führen werden. So werden aus einer Ergebnismenge, die ausschließlich durch exakten Zeichenkettenabgleich gefunden wurde, in einem nachfolgenden Schritt durch eine semantische Analyse diejenigen Dokumente herausgefiltert, die für die Suchfrage relevant sind. Die WWW-Nutzerschnittstelle und die Verwendung bereits bestehender Ordnungssysteme führen zu einer Minimierung des Arbeitsaufwands auf Nutzerseite. Die Kosten für eine Suche lassen sich sowohl auf der Input-Seite verringern, indem eine aufwendige "manuelle" Indexierung entfällt, als auch auf der Output-Seite, indem den Nutzern leicht bedienbare Suchoptionen zur Verfügung gestellt werden

Theme

Bibliographie
Semantisches Umfeld in Indexierung u. Retrieval

Field

Soziologie

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5. Bekavac, B.: Suchverfahren und Suchdienste des World Wide Web (1996) 0.17

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