Search (16 results, page 1 of 1)

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Abstract

Reviews developments in full text databases in 1996. Online services are differentiated through quantity rather than niche specializations of content. Full text databases are appearing on the WWW. Examines examples of trade magazine on the WWW from the networking and data communications area. Covers: Networks World Fusion; Data Communications on the Web; Communications Week Interactive; Network Computing Online; LAN Times Online and LAN on the Web

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Source

Internet reference services quarterly. 3(1998) no.2, S.75-81

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Abstract

Reviews developments in full text databases in 1995. Numbers of full text databases have increased by 12%. Consumer services are offering more full text databases, as is the Internet. News feeds are increasingly being offered to corporate users. Contemplates the ideal information service and how full text databases could evolve in this environment

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Abstract

Verity Search 97 software will index and search e-mail, attachments, folders and documents on local and network disk drives. The Internet may be searched via the same front end and changes to particular documents or pages may be monitored. Documents may be viewed in their native formats including ASCII, HTML, PDF and popular word processors, with highlighted search terms. Agents may be launched into the Internet to retrieve information according to a user-specified profile. The software can index about 700 MB an hour. Describes the search technology which includes fuzzy logic and natural language. The Web version of Personal Search 97 works with Netscape Navigator or Microsoft Internet Explorer, while the Exchange version will work regardless of any attachment to an Exchange server. Search 97 Personal improves online time and access time and allows searches to be refined offline

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Abstract

Full text management which applied to document management tends to be centred on text storage and retrieval. Recent developments are concerned with integration with relational database management system products to deliver document management services offering both the flexibility of text retrieval and the ability to support process based funnctions. There has been a move towards client server architectures, more user friendly user interfaces and more flexible and easier to understand retrieval. Advocates caution in choosing tasks for full text methods. Identifies document management functions for which the combined use of database management systems or special purpose tools should be considered

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Abstract

State of the art review of the development of full text databases, encompassing: types of commercially available full text databases; online systems for full text databases; CD-ROM databases for full text databases; full text databases on magnetic discs or tapes; creation of full text databases; searching and display requirements for full text searching and software. Concludes that bibliographic information services without full text support solve only half of the retrieval problems

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Abstract

Describes a research goal set by many offices within the US Department of Energy. Reviews efficient full text searching techniques being developed to better understand and meet this goal. Classical computer human interaction (CHI) approaches provided by commercial information retrieval engines fail to contextualize information in ways that facilitates timely decision making. Discusses the uses of advanced CHI techniques in combination with deductive database technology to augment the weaknesses found in the presentation capabilities of information retrieval engines. Presents various techniques employed in a WWW based prototype system currently under development

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Abstract

Die bibliothekarische Informationserschließung war unist bislang durch den OPAC geprägt, der im wesentlichen die Monographien und Zeitschriften einer Bibliothek erschließt. Es werden 2 neue Bereiche skizziert, die in Zukunft ebenfalls Teil der bibliothekarischen Informationserschließung sein können und werden: die Erschließung unselbständiger Literatur und der Einsatz automatisierter 'reference and information services'. Im ersten Fall ist die Entwicklung bereits weit vorangeschritten, Verbundsysteme und Library Suppliers bieten bereits Inhaltsdaten von Zeitschriften als Fremdleistung an. Im zweiten Fall ist die Entwicklung, vor allem im angloamerikanischen Raum, noch - trotz zahlreicher Projekte - in den Anfängen. Der Einsatz wissensbasierter Systeme in diesem Bereich macht die Aufgaben hier besonders komplex, biete zugleich aber hanz neue Lösungsmöglichkeiten an, wie am Beispiel einiger amerikanischer Projekte dokumentiert wird. Wesentlich ist, daß Informationserschließungssysteme, wie sie ansatzweise im Internet bereits eingesetzt werden, den gesamten bereich elektronischer wie herkömmlicher Information umfassen, um einen allgemeinen und umfassenden Einstieg für den Informationssuchenden zu bieten

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Abstract

Gross et al. (2015) have demonstrated that about a quarter of hits would typically be lost to keyword searchers if contemporary academic library catalogs dropped their controlled subject headings. This article reports on an investigation of the search value that subject descriptors and identifiers assigned by professional indexers add to a bibliographic database, namely the Australian Education Index (AEI). First, a similar methodology to that developed by Gross et al. (2015) was applied, with keyword searches representing a range of educational topics run on the AEI database with and without its subject indexing. The results indicated that AEI users would also lose, on average, about a quarter of hits per query. Second, an alternative research design was applied in which an experienced literature searcher was asked to find resources on a set of educational topics on an AEI database stripped of its subject indexing and then asked to search for additional resources on the same topics after the subject indexing had been reinserted. In this study, the proportion of additional resources that would have been lost had it not been for the subject indexing was again found to be about a quarter of the total resources found for each topic, on average.

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Abstract

Gross et al. (2015) have demonstrated that about a quarter of hits would typically be lost to keyword searchers if contemporary academic library catalogs dropped their controlled subject headings. This paper reports on an analysis of the loss levels that would result if a bibliographic database, namely the Australian Education Index (AEI), were missing the subject descriptors and identifiers assigned by its professional indexers, employing the methodology developed by Gross and Taylor (2005), and later by Gross et al. (2015). The results indicate that AEI users would lose a similar proportion of hits per query to that experienced by library catalog users: on average, 27% of the resources found by a sample of keyword queries on the AEI database would not have been found without the subject indexing, based on the Australian Thesaurus of Education Descriptors (ATED). The paper also discusses the methodological limitations of these studies, pointing out that real-life users might still find some of the resources missed by a particular query through follow-up searches, while additional resources might also be found through iterative searching on the subject vocabulary. The paper goes on to describe a new research design, based on a before - and - after experiment, which addresses some of these limitations. It is argued that this alternative design will provide a more realistic picture of the value that professionally assigned subject indexing and controlled subject vocabularies can add to literature searching of a more scholarly and thorough kind.

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Content

"Mit Google Print bzw. mittlerweile Google Book Search und dem Projekt zur Übernahme eines brancheneigenen Portals zur Pflege und Bereitstellung digitaler Daten aus Büchern namens "Volltextsuche online" initiiert durch den Börsenverein des Deutschen Buchhandels tritt ein Thema auf den Plan, das im deutschen Sprachraum lange vernachlässigt wurde: allgemein gesprochen, die Notwendigkeit der Texterschließung durch Indexierung - sei sie gedruckt in Form von Registern im Anhang von Sach- und wissenschaftlichen Büchern oder ungedruckt in Form sog. Volltextabfragen per Suchmaske am Computer. Angesichts der exponentiell wachsenden Menge an Wissen ist es gut, wenn hierzu Überlegungen angestellt werden und damit die Chance besteht, neben der wirtschaftlichen auch über die wissenstheoretische Dimension dieser Dienste nachzudenken. Zweifellos wird die Bedeutung der Indexierung von Fließtext aus wissenstheoretischer Sicht in Zukunft noch weiter wachsen und bedeutet im Falle einer Online-Plattform (wenn sie denn in naher Zukunft eine hinreichend große Menge an Büchern in ihrem Datenbestand aufweisen wird) die Erfüllung eines Traumes für die wissenschaftliche Arbeit: Es ist fantastisch, in Millisekunden das Vorhandensein von Personen, Termen, Phrasen und Wortkomposita zu ermitteln, um die Ein- bzw. Nichteinschlägigkeit eines Buches und - mehr noch -vieler Bücher für die eigene Arbeit eindeutig beantworten zu können. Es ist fantastisch, im Trefferfall die gesuchte Information sogleich auf dem Monitor exzerpieren zu können oder sich auch bei ausbleibenden Treffern das Durcharbeiten eines ganzen Buches, vielleicht sogar einer halben Bibliothek ersparen zu können. Dabei ist das letztere Resultat mindestens eine genauso wichtige Information wie die erste, denn auch sie wird- man darf fast sagen, so gut wie immer - zu einer unglaublichen Ersparnis an Zeit verhelfen; hier bedeutet allein schon die Verringerung der Datenmenge einen Zuwachs an Wissen unter minimalem Zeitaufwand. Angesichts dieser Diagnose ist die These zu wagen, die digitale Revolution beginnt erst wirklich bei der Nutzung der Volltexte selbst als Datenquelle zur Wissensabfrage.
. . . Ich plädiere hier aus den oben genannten wissenstheoretischen Gründen nicht nur für die Aufrechterhaltung eines Mindestmaßes an Registern und Indexen im Anhang von physischen Büchern, sondern sogar für deren Ausbau, deren standardmäßige Zugabe bei Sach- und wissenschaftlichen Büchern gerade angesichts der Volltextnutzung durch Online-Abfragen. Warum? Hierzu sechs Argumente: 1. Wie oben bereits angerissen, lehrt die Erfahrung bei CD-ROM-Zugaben zu opulenten Werken, dass Parallelmedien mit Parallelinhalten von den Nutzern nicht wirklich angenommen werden; es ist umständlich, zur Auffindung bestimmter Textstellen den Computer befragen zu müssen und die Fundstellen dann zwischen zwei Buchdeckeln nachzuschlagen. 2. Über frei wählbare Suchbegriffe seitens des Nutzers ist noch keine Qualität der Suchergebnisse garantiert. Erst das Einrechnen entsprechender Verweisungsbegriffe und Synonyme in die Suchabfrage führt zu Qualität des Ergebnisses. Die scheinbar eingesparten Kosten einer einmaligen bzw. abonnementartigen Investition in eine Online-Verfügbarkeit der Buchinhalte vonseiten der Verlage werden dann über die Hintertür doch wieder fällig, wenn sich nämlich herausstellt, dass Nutzer bei der von ihnen gesuchten Information nicht fündig werden, weil sie unter dem "falschen", d.h. entweder ihnen nicht bekannten oder einem ihnen gerade nicht präsenten Schlagwort gesucht haben. Die Online-Suchabfrage, die auf den ersten Blick höchst nutzerfreundlich erscheint, da eine ungeheure Menge an Titeln die Abfrage umfasst, erweist sich womöglich als wenig brauchbar, wenn sich die Trefferqualität aus den genannten Gründen als beschränkt herausstellt. 3. Nur bei entsprechenden Restriktionen des Zugangs bzw. der präsentierten Textausschnitte werden die Verlage es gewährleistet sehen, dass die Nutzerin, der Nutzer nicht vom Kauf des physischen Buches Abstand nehmen. Nur wenn die Nutzer wissen, dass ihnen gerade jene Informationen am Bildschirm vorenthalten werden, die sie im zu erwerbenden Buch mit Gewissheit finden werden, werden sie das Buch noch erwerben wollen. Wer auf die Schnelle nur ein Kochrezept aus einem teuer bebilderten Kochbuch der Oberklasse abrufen kann, wird das teure Kochbuch eben nicht mehr kaufen. Analog stellt sich die Frage, ob nicht aus diesem Grunde auch Bibliotheken erwägen werden, angesichts der elektronischen Präsenz teuerer physischer Bücher auf den Erwerb der Letzteren zu verzichten, wohl wissend, dass den Wissenschaftlern im Zweifel einige Mausklicks genügen, um die gewünschte Begriffsrecherche erschöpfend beantwortet zu finden.

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Date

23. 1.1999 19:22:09

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Date

22. 7.2000 17:48:06

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Date

14. 6.2001 12:22:31

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Source

c't. 2002, H.22, S.190-197

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Date

9. 1.1996 10:22:31