-
Lambert, N.: Of thesauri and computers : reflections on the need for thesauri (1995)
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- Abstract
- Most indexed databases now include their thesauri and/or coding in their bibliographic files, searchable at the databases' online connect rates. Assesses the searchability of these on the different hosts. Thesauri and classifications are also available as diskette or CD-ROM products. Describes a number of these, highlighting the diskette thesaurus from IFI/Plenum Data for its flexible databases, the CLAIMS Uniterm and Comprehensive indexes to US chemical patents
- Source
- Searcher. 3(1995) no.8, S.18-22
- Theme
- Verbale Doksprachen im Online-Retrieval
-
Davies, R.: Thesaurus-aided searching in search and retrieval protocols (1996)
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- Abstract
- Open system protocols for search and retrieval have not provided explicit ways in which to implement thesaurus-aided searching. A number of different approaches within the existing protocols, as well as a proposed service, are evaluated. A general approach to implementing thesaurus-aided searching, particularly during consultation of a thesaurus, requires an entirely new service, whose main features are described
- Theme
- Verbale Doksprachen im Online-Retrieval
-
Milstead, J.L.: Thesauri in a full-text world (1998)
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- Date
- 22. 9.1997 19:16:05
- Theme
- Verbale Doksprachen im Online-Retrieval
-
Chen, H.; Yim, T.; Fye, D.: Automatic thesaurus generation for an electronic community system (1995)
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- Abstract
- Reports an algorithmic approach to the automatic generation of thesauri for electronic community systems. The techniques used included terms filtering, automatic indexing, and cluster analysis. The testbed for the research was the Worm Community System, which contains a comprehensive library of specialized community data and literature, currently in use by molecular biologists who study the nematode worm. The resulting worm thesaurus included 2709 researchers' names, 798 gene names, 20 experimental methods, and 4302 subject descriptors. On average, each term had about 90 weighted neighbouring terms indicating relevant concepts. The thesaurus was developed as an online search aide. Tests the worm thesaurus in an experiment with 6 worm researchers of varying degrees of expertise and background. The experiment showed that the thesaurus was an excellent 'memory jogging' device and that it supported learning and serendipitous browsing. Despite some occurrences of obvious noise, the system was useful in suggesting relevant concepts for the researchers' queries and it helped improve concept recall. With a simple browsing interface, an automatic thesaurus can become a useful tool for online search and can assist researchers in exploring and traversing a dynamic and complex electronic community system
- Theme
- Verbale Doksprachen im Online-Retrieval
-
Francu, V.: Building a multilingual thesaurus based on UDC (1996)
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- Theme
- Klassifikationssysteme im Online-Retrieval
-
Byrne, C.C.; McCracken, S.A.: ¬An adaptive thesaurus employing semantic distance, relational inheritance and nominal compound interpretation for linguistic support of information retrieval (1999)
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- Date
- 15. 3.2000 10:22:37
-
Schenkel, M.: Vom Leitkartenthesaurus zum Online-Bibliotheksthesaurus : Die Revision des Dokumentationssystems der Bibliothek des Deutschen Bundestages (1949-1998) (1998)
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- Source
- Information und Märkte: 50. Deutscher Dokumentartag 1998, Kongreß der Deutschen Gesellschaft für Dokumentation e.V. (DGD), Rheinische Friedrich-Wilhelms-Universität Bonn, 22.-24. September 1998. Hrsg. von Marlies Ockenfeld u. Gerhard J. Mantwill
-
Crouch, C.J.: ¬An approach to the automatic construction of global thesauri (1990)
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- Abstract
- The benefits of a well constructed thesaurus to an information retrieval system have long been recognised by both researchers and practitioners in the field. Examines both early and current approaches to automatic thesaurus construction and describes an approach to the automatic generation of global thesauri based on the term discrimination value model of Salton Yang, and Yu and on an appropriate clustering algorithm. This method has been implemented and applied to 2 document collections. Preliminary results indicate that this method, which produces improvements in retrieval performance in excess of 10 and 15% in the test collections, is viable and worthy of continued investigation.
- Date
- 22. 4.1996 3:39:53
-
Shapiro, C.D.; Yan, P.-F.: Generous tools : thesauri in digital libraries (1996)
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- Abstract
- The Electronic Libraries and Information Highways MITRE Sponsored Research project aims to help searchers working in digital libraries increase their chance of matching the language of authors. Focuses on whether query formulation can be improved through the addition of semantic knowledge that is interactively gathered from a thesaurus that exists in a distributed, interoperating, cooperative environment. A prototype, ELVIS, was built that improves information retrieval through query expansion and is based on publicly available Z39.50 standard thesauri integrated with networked information discovery and retrieval tools
- Source
- Proceedings of the 17th National Online Meeting 1996, New York, 14-16 May 1996. Ed.: M.E. Williams
- Theme
- Semantisches Umfeld in Indexierung u. Retrieval
-
Jank, D.: Frauenthesauri im Informations- und Dokumentationsbereich (1996)
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-
Sarre, F.; Güntzer, U.; Myka, A.; Jüttner, G.: Maschinelles Lernen von Relationen für Thesauri und Hypertext (1992)
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- Abstract
- Fortschrittliche Informationssysteme stellen ihren Benutzern 2 wichtige Suchmethoden zur Verfügung: die gezielte (Volltext-) Suche und das Navigieren im Objektbestand mit Hilfe von Hypertext-Links. Der Grund, warum diese beiden Konzepte aber auf breiter Basis noch nicht in jedem Informationssystem Anwendung gefunden haben, ist darin zu sehen, daß der manuelle Aufbau von umfassenden Hypertext-Strukturen auf der einen Seite und von großen Thesauri, die den Erfolg von Volltextsuchen wesentlich steigern, auf der anderen Seite bislang enormen Aufwand und damit hohe Kosten verursachte. Langfristig werden Informationssysteme aber nur dann große Akzeptanz bei der Benutzerschaft erzielen, wenn sie ihre Benutzer mit diesen beiden Techniken unterstützen und wenn sie dynamisch neuen Informationsbedürfnissen anpassen können, also lernfähig sind. Für den einzelnen Benutzer ergibt sich daraus der wesentliche Vorteil, daß er von den Recherche-Erfahrungen anderer Benutzer profitieren kann. In diesem Papier stellen wir eine Lernkomponente vor, die für das Hypertextsystem 'HyperMan' an der TU München entwickelt und implementiert wurde. Wir zeigen beispielhaft, wie Volltext-Suchanfragen der HyperMan-Benutzer von der Lernkomponente untersucht werden, um Thesauruseinträge zu gewinnen. Bei der Entwicklung dieser Lerntechniken zum (automatischen) Thesaurusaufbau konnte auf Erfahrungen mit dem lernfähigen Information Retrieval System 'Tegen' zurückgegriffen werden. In dem HyperMan System werden aber nicht nur Beziehungen (Relationen) zwischen Begriffen erlernt, sondern auch zwischen Textstücken. Wir gehen daher auch darauf ein, wie aufgrund einer Analyse des Benutzerverhaltens sowohl neue Hypertext-Links erlernt als auch vorhandene Links, die zuvor von HyperMans Generierungskomponente automatisch erzeugt wurden, modifiziert werden
-
Pollard, R.: Hypertext presentation of thesauri used in on-line searching (1990)
0.02
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- Abstract
- Explores the strengths and limitations of hypertext for the online presentation of thesauri used in information retrieval. Examines the ability of hypertext to support each of 3 common types of thesaurus display: graphic, alphabetical, and hierarchical. Presents a design for a hypertext-based hierarchical display that addresses many inadequacies of printed hierarchical displays. Ullustrates how the design might be implemented using a commercially available hypertext system. Considers issues related to the implementation and evaluation of hypertext-based thesauri
-
Schmitz-Esser, W.: Thesaurus and beyond : an advanced formula for linguistic engineering and information retrieval (1999)
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- Source
- Knowledge organization. 26(1999) no.1, S.10-22
-
Milstead, J.L.: Specifications for thesaurus software (1991)
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- Abstract
- Specifications are presented for software designed to support manual development and maintenance of information retrieval thesauri. The specifications are intended to support both evaluation of existing packages for acquisition and design of custom software. Specialized requirements of thesaurus support are emphasized over more general database management requirements. Requirements for integration with larger systems and for the user interface are summarized. Relationships specified by the ANSI standard should be supported, and the relationships should be validated to avoid introduction of conflicting relationships. Flexibility in availability of note and date fields is important, and where required, term classifications should be available. Maintenance procedures should include provision for feedback on the impact of changes, as well as appropriate levels of approval for changes. A wide variety of online displays and printed reports are required, including but not limited to alphabetical, hierarchical, and rotated. In addition, it is desirable to be absle to search the thesaurus database with such capabilities as Boolean logic and proximity operators
-
Lopez-Huertas, M.J.: Thesaurus structure design : a conceptual approach for improved interaction (1997)
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- Abstract
- The need for thesauri to help users in their search for information in online information systems has been discussed for several decades. Many wide-ranging contributions have been made to solve this problem. Nevertheless, investigation is needed to design a thesaurus structure based on what is relevant for users and generators of information within a specific subject domain. Explores the possibility of creating a thesaurus from the cognitive viewpoint. This approach is based on a system that organizes its representation of knowledge or its classification as closely as possible to the authors' and users' images of the subject domain with the objective of increasing the interaction between users and texts, and thus the communication in a given information retrieval system. Discourse analysis is used as a main method to identify the categories and its relevance for building such a structure is discussed
-
Viegener, J.; Maurer, A.: ¬Ein Ansatz zur Dynamisierung von Thesauri in Informationssystemen (1993)
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- Abstract
- Im folgenden wird ein Ansatz für die Verbesserung von dokumentbasierten Informationssystemen unter Verwendung von Methoden der Künstlichen Intelligenz vorgestellt. Dabei wird ein dynamischer Thesaurus verwendet, der speziell an den jeweiligen Dokumentenbestand angepaßt ist. Erzeugung und Pflege dieses Thesaurus werden (teil-) automatisiert durch eine Wissensakquisitionskomponente durchgeführt; dies geschieht unter Ausnutzung von Benutzerwissen und durch Analyse des Dokumentenbestandes. Hierzu ist ein erweiterter Thesaurusbegriff notwendig, bei dem dieser als Wissensrepräsentationsstruktur gesehen wird. Die Verwendung einer graphischen Oberfläche (GUI) macht den Thesaurus dem Benutzer direkt zugänglich
-
Zimmermann, H.H.: Automatische Indexierung und elektronische Thesauri (1996)
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- Source
- Zukunft der Sacherschließung im OPAC: Vorträge des 2. Düsseldorfer OPAC-Kolloquiums am 21. Juni 1995. Hrsg.: E. Niggemann u. K. Lepsky
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Zainab, A.N.; Silva, S.M. de: Expert systems in library and information services : publication trends, authorship patterns and expressiveness of published titles (1998)
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- Abstract
- Presents a state of the art review of the literature of expert systems in library and information science, involving exhaustive searches of all major LIS CD-ROM databases (LISA, ERIC, LiLi, INSPEC etc.) and bibliographies appended in review articles. The search retrieved 679 references, comprising 362 periodical articles, 180 conference proceedings, 63 books articles, 28 theses and 46 monographs. The growth of the literature peaked between 1989 and 1990 and subsequently declined after 1992. Over 1/3 (287) covered intelligent front ends and interfaces for online searching and retrieval, followed by applications in reference service (113), classification, indexing and abstracting (86) and cataloguing (7). The most productive periodicals comprised 6 titles, of which 'Information processing and management' topped the lsit: 43 authors were found to contribute between 5 and 35 articles each, hence contributing 32,19% of the total contributors. 382 of the publications were single author works, 172 were by 2 authors, 72 were by 3 authors and 49 were by 4 or more authors. Only 161 titles were expressive enough to reveal both the name and function of systems being developed
-
Jansen, R.: Thesaurusrelationen als instrumentelle Hilfsmittel für Hypertext und Wissensbanken? (1993)
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- Abstract
- Ausgehend vom derzeitigen Wissensstand über Hypertext wird einleitend dargelegt, inwieweit und weshalb Relationen zwischen Begriffen und deren Darstellung ein Teilaspekt von Hypertext (und Wissensbanken) sind. Begriffsrelationen ihrerseits sind in der IuD-Praxis im besonderen Maße als Thesaurusrelationen realisiert. Welche Anforderungen sind an Thesaurusrelationen zu stellen, damit sie als Instrument bei der Generierung von Hypertextrelationen angewendet werden können? Wie steht es eigentlich mit der Definition von Thesaurusrelationsarten (hierarchische vs. nichthierarchische, gerichtete vs. ungerichtete Begriffsrelationen)? Nach einem (notwendigerweise kurzen und zugleich kritischen) Überblick über den Kenntnis- und Erfahrungsstand werden Vorschläge zu einer verbesserten Klassifikation und Definition von Begriffsrelationsarten für den IuD-Bereich gemacht. Die Vorschläge führen zu differenzierteren Möglichkeiten der Darstellung von Netzstrukturen. Die Auswirkungen dieser Erkenntnisse auf die Generierung von Hypertext und von Wissensbanken, insbesondere auf die Darstellung von netzartigen Verknüpfungen, werden abschließend noch einmal erörtert
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Raupp, J.: Konzeption eines Standard-Thesaurus für Ökologischen Landbau (1994)
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- Abstract
- Die Vergabe von Keywords mit Hilfe eines (poly)hierarchisch gegliederten Thesaurus hat gegenüber der freien Verschlagwortung eine Reihe von Vorteilen. Ein Nachteil des Thesaurus ist jedoch, daß er einigen Aufwand für Planung, Aufbau und Pflege erfordert. Ein Standard-Thesaurus, der für die eigenen Bedürfnisse modifiziert wird, kann deshalb ein Weg sein, um die Vorteile des Thesaurus nutzen zu können, ohne gleichzeitig den erwähnten Aufwand in vollem Umfang leisten zu müssen. Konzeption, Aufbau und Inhalt eines Standard-Thesaurus Ökologischer Landbau werden hier vorgestellt. Der Vergleich mit dem üblicherweise verwendeten Vokabular AGROVOC macht die Überlegenheit des Standard-Thesuaurs im Hinblick auf korrekte Verschlagwortung deutlich
