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Abstract

Purpose: To provide a critical review of Bergman's 2001 study on the Deep Web. In addition, we bring a new concept into the discussion, the Academic Invisible Web (AIW). We define the Academic Invisible Web as consisting of all databases and collections relevant to academia but not searchable by the general-purpose internet search engines. Indexing this part of the Invisible Web is central to scien-tific search engines. We provide an overview of approaches followed thus far. Design/methodology/approach: Discussion of measures and calculations, estima-tion based on informetric laws. Literature review on approaches for uncovering information from the Invisible Web. Findings: Bergman's size estimate of the Invisible Web is highly questionable. We demonstrate some major errors in the conceptual design of the Bergman paper. A new (raw) size estimate is given. Research limitations/implications: The precision of our estimate is limited due to a small sample size and lack of reliable data. Practical implications: We can show that no single library alone will be able to index the Academic Invisible Web. We suggest collaboration to accomplish this task. Originality/value: Provides library managers and those interested in developing academic search engines with data on the size and attributes of the Academic In-visible Web.

Content

Bezug zu: Bergman, M.K.: The Deep Web: surfacing hidden value. In: Journal of Electronic Publishing. 7(2001) no.1, S.xxx-xxx. [Vgl. unter: http://www.press.umich.edu/jep/07-01/bergman.html].

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Abstract

Der Beitrag stellt Einsatzmöglichkeiten und spezifische Problembereiche von Crosskonkordanzen (CK) im Projekt "Kompetenznetzwerk Modellbildung und Heterogenitätsbehand lung" (KoMoHe) so wie das Netz der bis dato entstandenen Terminologie-Überstiege vor. Die am IZ entstandenen CK sollen künftig über einen Terminologie-Service als Web Service genutzt werden, dieser wird im Beitrag exemplarisch vorgestellt. Des Weiteren wird ein Testszenario samt Evaluationsdesign beschrieben über das der Mehrwert von Crosskonkordanzen empirisch untersucht werden kann.

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Abstract

Der Beitrag stellt das Verfahren zur Erstellung von Crosskonkordanzen (CK) im Projekt "Kompetenznetzwerk Modellbildung und Heterogenitätsbehandlung" (KoMoHe)1 sowie das Netz der bis dato entstandenen Terminologie-Überstiege vor. Neben CK zwischen Indexierungssprachen innerhalb eines Anwendungsgebiets (z.B. Sozial- und Politikwissenschaften), werden Termbeispiele vorgestellt, die Fächer unterschiedlicher Fachgebiete verknüpfen. Es werden weiterhin typische Einsatzszenarien der CK innerhalb von Informationssystemen präsentiert. Die am IZ entstandenen CK sollen künftig über einen Terminologie-Service als Web Service genutzt werden. Der sog. Heterogenitätsservice, der als Term-Umschlüsselungs-Dienst fungieren soll, wird exemplarisch anhand konkreter Fragestellungen vorgeführt.

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Abstract

In 2004, the German Federal Ministry for Education and Research funded a major terminology mapping initiative at the GESIS Social Science Information Centre in Bonn (GESIS-IZ), which will find its conclusion this year. The task of this terminology mapping initiative was to organize, create and manage 'crossconcordances' between major controlled vocabularies (thesauri, classification systems, subject heading lists) centred around the social sciences but quickly extending to other subject areas. Cross-concordances are intellectually (manually) created crosswalks that determine equivalence, hierarchy, and association relations between terms from two controlled vocabularies. Most vocabularies have been related bilaterally, that is, there is a cross-concordance relating terms from vocabulary A to vocabulary B as well as a cross-concordance relating terms from vocabulary B to vocabulary A (bilateral relations are not necessarily symmetrical). Till August 2007, 24 controlled vocabularies from 11 disciplines will be connected with vocabulary sizes ranging from 2,000 - 17,000 terms per vocabulary. To date more than 260,000 relations are generated. A database including all vocabularies and cross-concordances was built and a 'heterogeneity service' developed, a web service, which makes the cross-concordances available for other applications. Many cross-concordances are already implemented and utilized for the German Social Science Information Portal Sowiport (www.sowiport.de), which searches bibliographical and other information resources (incl. 13 databases with 10 different vocabularies and ca. 2.5 million references).