Search (17 results, page 1 of 1)

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Theme

Klassifikationssysteme im Online-Retrieval

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Theme

Klassifikationssysteme im Online-Retrieval

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Abstract

Since the introduction of Regeln fur den Schlagwortkatalog (RSWK - Subject Cataloguing Rules) and the arrival of online public catalogues, librarians might ask whether number building is essential or whether the same result could be achieved with Boolean operators. Descriptive categories could be prepared, with word or phrase inversion, as a retrieval system component. The role of syntactic indexing in online retrieval and consequences for service interface ...

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Source

Die theoretische Ausbildung der Bibliotheksreferendare. Die Umsetzung der Empfehlungen für die Ausbildung des Höheren Bibliotheksdienstes an den Ausbildungseinrichtungen. Referate und Diskussionsergebnisse ... 22. und 23.11.1990 in Frankfurt/M. Hrsg.: J. Tehnzen

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Date

20. 4.2020 20:22:29

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Abstract

Facettenklassifikationen wurden bislang vorwiegend im Hinblick auf ihre Verwendungsmöglichkeiten in präkombinierten systematischen Katalogen bzw. Bibliographien betrachtet, nicht so sehr unter dem Aspekt eines möglichen Einsatzes in postkoordinierenden Retrievalsystemen. Im vorliegenden Beitrag soll nachgewiesen werden, daß Facettenklassifikationen anderen Techniken des Online Retrievals überlegen sein können. Hierzu sollten Begriffs- und Facettenanalyse mit einem strukturabbildenden Notationssystem kombiniert werden, um mit Hilfe Boolescher Operatoren (zur Verknüpfung von Facetten unabhängig von einer definierten Citation order) und Truncierung hierarchisch differenzierte Dokumentenmengen für komplexe Fragestellungen zu erhalten. Die Methode wird an zwei Beispielen illustriert: das erste nutzt eine kleine, von B. Buchanan entwickelte Klassifikation, das zweite das für Library and Information Science Abstracts (LISA) verwendete Klassifikationssystem. Weiter wird am Beispiel PRECIS diskutiert, welche Möglichkeiten des syntaktischen Retrievals Rollenoperatoren bieten können.

Theme

Klassifikationssysteme im Online-Retrieval

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Theme

Klassifikationssysteme im Online-Retrieval

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Theme

Verbale Doksprachen im Online-Retrieval

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Abstract

"Online retrieval" conjures up a very different mental image now than in 1991, the year this article was written, and the year Tim Berners-Lee first revealed the new hypertext system he called the World Wide Web. Gödert shows that truncation and Boolean logic, combined with notation from a faceted classification system, will be a powerful way of searching for information. It undoubtedly is, but no system built now would require a user searching for material on "nervous systems of bone fish" to enter "Fdd$ and Leaa$". This is worth reading for someone interested in seeing how searching and facets can go together, but the web has made this article quite out of date.

Theme

Klassifikationssysteme im Online-Retrieval

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Abstract

Experiences with retrieval in OPACs suggest that there are major problems for the users of such systems, such as choosing the 'correct' subject access vocabulary, narrowing or broadening the set of items retrieved regarding the search interest. Such problems relate to two facts: (1) that in the early OPACs subject access has not been considered seriously enough and (2) that the complexity of the topic has not been really recognized. Using a typology of users' questions it is demonstrated which requirements musts be met by a successful online subject access. Improvements of subject access tools are primarily aimed at, pinpointing the interplay between the different subcomponents of any subject facility: a) the features of the indexing languages used; b) the indexing principles used; c) the design and structuring of the database; and d) the possibilities of the technical retrieval facility, the search mode, and query languages. The contribution summarizes the manifold interactions between the four subcomponents listed. Any successful retrieval will heavily depend on the design of these components considering their interactions.

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Abstract

Examines the advantages and disadvantages of precoordinated, postcoordinated and automatic indexing with regard to existing information storage systems, such as card catalogues, OPACs, CR-ROM databases, and online databases. Presents a general model of document content representation and concludes that the library profession needs to address the development of databank design models, relevance feedback methods and automatic indexing assessment methods, to make indexing more effective

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Abstract

Internet, Neue Medien, CD-ROM - und Bibliotheken. Bibliothekare, vor allem auch ihre Standesvertreter, werben für die Institution Bibliothek gerne mit dem Hinweis, daß gerade dort das notwendige Know-how zur Nutzbarmachung der schönen neuen Online-Welt vorhanden sei. Dabei wird allzuhäufig auf die Tradition und Erfahrung der Profession bei der Erschließung und Strukturierung von Wissensressourcen verwiesen, ohne daß diese Argumentation in irgendeiner Weise kritisch hinterfragt würde. Gerade die bibliothekarischen Erschließungsinstrumente haben sich bisweilen unter OPAC-Bedingungen als wenig tauglich erwiesen (etwa die RSWK), was in vielen Fällen auch die fehlende Akzeptanz auf Benutzerseite erklärt. Hinzu kommt, daß die Internetgemeinde mit den Suchmaschinen und -verzeichnissen der kommerziellen Anbieter anscheinend ganz gut allein zurechtkommt. - Was also fehlt noch, und was könnte dabei der spezifisch bibliothekarische Beitrag sein?

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Abstract

Sachliche Suchen in bibliothekarischen Online-Katalogen enden häufig mit unbefriedigenden Ergebnissen. Als eine Ursache dafür kann angesehen werden, daß die Gestaltung des Suchprozesses das semantische Umfeld einer Suchanfrage nicht mit einbezieht, daß in Übertragung der Verhältnisse in konventionellen Katalogen am Paradigma des Wort-Matching zwischen Suchwort und Indexat festgehalten wird. Es wird statt dessen das Konzept einer semantischen Umfeldsuche entwickelt und gezeigt, welche Rolle die Verwendung strukturierten Vokabulars dafür spielen kann. Insbesondere wird dargestellt, welche Möglichkeiten Verfahren der wörterbuchgestützten maschinellen Indexierung in diesem Zusammenhang spielen können. Die Ausführungen werden durch Beispiele illustriert

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Date

22. 3.2008 16:17:15