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Abstract

Statistical methods for automated document indexing are becoming an alternative to the manual assignment of keywords. We argue that the quality of the thesaurus used as a basis for indexing in regard to its ability to adequately cover the contents to be indexed and as a basis for the specific indexing method used is of crucial importance in automatic indexing. We present an interactive tool for thesaurus evaluation that is based on a combination of statistical measures and appropriate visualisation techniques that supports the detection of potential problems in a thesaurus. We describe the methods used and show that the tool supports the detection and correction of errors, leading to a better indexing result.

Source

International Journal of Metadata, Semantics and Ontologies. 3(2008) no.1, S.53-67

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Abstract

In this demonstration we present a visual analysis approach that addresses both developers and users of hierarchical classification systems. The approach supports an intuitive understanding of the structure and current use in relation to a specific collection. We will also demonstrate its application for the development and management of library collections.

Source

Research and advanced technology for digital libraries : proceedings of the 12th European conference, ECDL '08, Aarhus, Denmark

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Abstract

The federal system in Germany has created a segmented library landscape. Instead of a central entity responsible for cataloguing and indexing, regional library unions share the workload cooperatively among their members. One result of this approach is limited sharing of cataloguing and indexing information across union catalogues as well as heterogeneous indexing of items with almost equivalent content: different editions of the same work. In this paper, a method for clustering entries in library catalogues is proposed that can be used to reduce this heterogeneity as well as share indexing information across catalogue boundaries. In two experiments, the method is applied to several union catalogues and the results show that a surprisingly large number of previously not indexed entries can be enriched with indexing information. The quality of the indexing has been positively evaluated by human professionals and the results have already been imported into the production catalogues of two library unions.

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Date

22. 8.2009 19:51:28

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Content

Masterarbeit im Rahmen des postgradualen Fernstudiums Master of Arts (Library and Information Science)

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Abstract

Man versetze sich für einen kurzen Augenblick in ein Wohnheimzimmer einer Studentin, die eine Hausarbeit in Politologie zum Thema "Der Sozialstaat in der öffentlichen Wahrnehmung der Bundesrepublik Deutschland von 1990 bis 2010" schreibt. Es ist zwei Uhr nachts, die Universitätsbibliothek hat geschlossen und die Studentin muss bis spätestens 14 Uhr am gleichen Tag die Arbeit einreichen. Verzweifelt sucht sie im Online-Katalog nach weiterer Literatur, um die Forschungsdiskussion in den Fußnoten weiter zu differenzieren. Sie findet auch die entsprechenden gedruckten Publikationen, auf die sie leider nicht zugreifen kann, da die Bibliothek geschlossen hat. Dabei hat "ihre" Universitätsbibliothek E-Books lizenziert, die sie allerdings nicht gefunden hat, da die E-Books nicht im Online-Katalog erfasst, sondern nur auf der Homepage der Einrichtung verlinkt sind. Bei der Rückgabe der Arbeit erfährt die Studentin, dass sie eine bessere Note erhalten hätte, wenn sie nur die Forschungsdiskussion differenziert dargestellt hätte. Eine vollständige Einbindung der lizenzierten E-Books im Online-Katalog ist der Wunsch vieler Bibliotheken. Insbesondere mit der vermehrten Verfügbarkeit konsortial oder national lizenzierter Sammlungen und Pakete ist das Angebot zusehends unübersichtlicher geworden und die bisherige Praxis, elektronische Dokumente parallel zu den gedruckten Exemplaren manuell formal und inhaltlich zu erschließen, stößt an organisatorische und ressourcenbedingte Grenzen. Einer direkten maschinellen Verarbeitung steht das Problem entgegen, dass die bibliografischen Metadaten der E-Books häufig im Format MARC 21 geliefert werden, die lokalen Bibliothekssysteme in der Regel aber mit den Formaten MAB2 und Pica arbeiten und Daten in anderen Formaten nicht verarbeiten können. Ein Lösungsansatz besteht darin, die bibliografischen Metadaten an zentraler Stelle zu konvertieren und zu harmonisieren und den Bibliotheken im Format MAB2 zur Verfügung zu stellen. Dieser Ansatz ist allerdings nur für statische E-BookSammlungen praktizierbar und durch den Aufwand der Konversion in "saubere" MAB2-Daten mit einem deutlichen zeitlichen Verzug verbunden.