Search (38 results, page 1 of 2)

  • × theme_ss:"Verteilte bibliographische Datenbanken"
  1. Dupuis, P.; Lapointe, J.: Developpement d'un outil documentaire à Hydro-Quebec : le Thesaurus HQ (1997) 0.03 
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    Abstract
    Describes the backgroud to the construction of a thesaurus at Hydro-Quebec, Quebec, Canada. Several information units, linked to form a network, share the same bibliographic database. The need for coherence and efficiency was the principle motive for the construction of the multidisciplinary thesaurus. Describes the construction process, discusses the specifity of the tool, its circulation, and considers its use on a partnership basis with other information services
    Source
    Argus. 26(1997) no.3, S.16-22
  2. Nicholson, D.; Steele, M.: CATRIONA : a distributed, locally-oriented, Z39.50 OPAC-based approach to cataloguing the Internet (1996) 0.03 
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    Abstract
    The aims of CATRIONA were: (1) to investigate the requirements for developing procedures and applications for cataloguing and retrieval of networked resources, and (2) to explore the feasibility of a collaborative project to develop such applications and procedures and integrate them with existing library systems. The project established that a distributed catalogue of networked resources integrated with standard Z39.50 library system OPAC interfaces with information on hard-copy resources is already a practical proposition at a basic level. At least one Z39.50 OPAC client can search remote Z39.50 OPACs, retrieve USMARC records with URLs in 856$u, load a viewer like Netscape, and use it to retrieve and display the remotely held electronic resource on the local workstation. A follow-up project on related issues is being finalised.
    Source
    Cataloging and classification quarterly. 22(1996) nos.3/4, S.127-141
  3. Heery, R.: Information gateways : collaboration and content (2000) 0.03 
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    Abstract
    Information subject gateways provide targeted discovery services for their users, giving access to Web resources selected according to quality and subject coverage criteria. Information gateways recognise that they must collaborate on a wide range of issues relating to content to ensure continued success. This report is informed by discussion of content activities at the 1999 Imesh Workshop. The author considers the implications for subject based gateways of co-operation regarding coverage policy, creation of metadata, and provision of searching and browsing across services. Other possibilities for co-operation include working more closely with information providers, and diclosure of information in joint metadata registries
    Date
    22. 6.2002 19:38:54
  4. Milanesi, C.: Möglichkeiten der Kooperation im Rahmen von Subject Gateways : das Euler-Projekt im Vergleich mit weiteren europäischen Projekten (2001) 0.01 
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    Date
    22. 6.2002 19:41:59
  5. Croft, W.B.: Combining approaches to information retrieval (2000) 0.01 
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    Abstract
    The combination of different text representations and search strategies has become a standard technique for improving the effectiveness of information retrieval. Combination, for example, has been studied extensively in the TREC evaluations and is the basis of the "meta-search" engines used on the Web. This paper examines the development of this technique, including both experimental results and the retrieval models that have been proposed as formal frameworks for combination. We show that combining approaches for information retrieval can be modeled as combining the outputs of multiple classifiers based on one or more representations, and that this simple model can provide explanations for many of the experimental results. We also show that this view of combination is very similar to the inference net model, and that a new approach to retrieval based on language models supports combination and can be integrated with the inference net model
    Series
    The Kluwer international series on information retrieval; 7
  6. Arch-Int, N.; Sophatsathit, P.: ¬A semantic information gathering approach for heterogeneous information sources on WWW (2003) 0.01 
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  7. Dempsey, L.; Russell, R.; Murray, R.: ¬The emergence of distributed library services : a European perspective (1998) 0.01 
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    Abstract
    This article discusses the emergence of distributed library services drawing on recent European initiatives to describe developments. It focuses on Z39.50-based services. It outlines a descriptive framework for such services and briefly introduces developments in other domains. Projects funded through the EU Telematics Application Programme are highlighted and some recent developments in U.K. higher education are introduced
  8. Xu, J.; Croft, W.B.: Topic-based language models for distributed retrieval (2000) 0.01 
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    Abstract
    Effective retrieval in a distributed environment is an important but difficult problem. Lack of effectiveness appears to have two major causes. First, existing collection selection algorithms do not work well on heterogeneous collections. Second, relevant documents are scattered over many collections and searching a few collections misses many relevant documents. We propose a topic-oriented approach to distributed retrieval. With this approach, we structure the document set of a distributed retrieval environment around a set of topics. Retrieval for a query involves first selecting the right topics for the query and then dispatching the search process to collections that contain such topics. The content of a topic is characterized by a language model. In environments where the labeling of documents by topics is unavailable, document clustering is employed for topic identification. Based on these ideas, three methods are proposed to suit different environments. We show that all three methods improve effectiveness of distributed retrieval
    Series
    The Kluwer international series on information retrieval; 7
  9. Dempsey, L.; Russell, R.; Kirriemur, J.W.: Towards distributed library systems : Z39.50 in a European context (1996) 0.01 
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    Source
    Program. 30(1996) no.1, S.1-22
  10. Ashton, J.: ONE: the final OPAC frontier (1998) 0.01 
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    Source
    Select newsletter. 1998, no.22, Spring, S.5-6
  11. Lunau, C.D.: Z39.50: a critical component of the Canadian resource sharing infrastructure : implementation activities and results achieved (1997) 0.01 
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    Date
    3. 3.1999 17:22:57
  12. Burrows, T.: ¬The virtual catalogue : bibliographic access for the virtual library (1993) 0.01 
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    Date
    8.10.2000 14:47:22
  13. Ghiselli, C.; Padula, M.: ¬A unified access to extract knowledge from heterogeneous Web archives (2001) 0.01 
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    Abstract
    This paper proposes the integration of tools to provide unified access to remote and heterogeneous archives, the contents of which can be grouped under the same subject, and which have been integrated to allow the user to navigate and conduct thematic searches. The information sources are locally frequently modified, added to, and removed, therefore attention has been paid to the permanence of their references. Source interoperability is supported at language, protocol and schema levels. The architecture is based on a new common schema of the archives which is defined in new representation and query languages on the basis of an ontology to avoid misunderstanding and ambiguity.
  14. Kaizik, A.; Gödert, W.; Milanesi, C.: Erfahrungen und Ergebnisse aus der Evaluierung des EU-Projektes EULER im Rahmen des an der FH Köln angesiedelten Projektes EJECT (Evaluation von Subject Gateways des World Wide Web (2001) 0.01 
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    Date
    22. 6.2002 19:42:22
  15. Cousins, S.; Sanders, A.: Incorporating a virtual union catalogue into the wider information environment through the application of middleware: Interoperability issues in cross-database access (2006) 0.01 
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    Abstract
    Purpose - To explore the use of middleware to provide access to a virtual catalogue via Z39.50, allowing its integration with other services. To consider issues arising from the cross-database search process and the problem of interoperability between systems. Design/methodology/approach - Middleware was used to establish a Z39.50 server for an existing virtual union catalogue, InforM25. The Copac physical union catalogue was used to carry out cross-database search tests, investigating the value of query transformation by the middleware and illustrating many of the issues associated with interoperability in cross-database searching. Findings - The test results demonstrate the viability and benefits of using middleware to allow the integration of virtual catalogues with other services. The results also illustrate the range of issues affecting the performance of the virtual catalogue, with supporting evidence from the use of the Copac physical union catalogue for cross-database searching via Z39.50. In particular the discussion highlights the issue of semantic interoperability, as well as emphasising the value of centralised virtual catalogue support. Research limitations/implications - The research was limited to work on a specific virtual union catalogue, that is InforM25, but the results highlight issues with general relevance in the development of any virtual catalogue. The need for more work on response times in the virtual union catalogue is apparent, along with the related issue of result set post processing. Originality/value - This paper provides a practical demonstration of the issues important to those involved in making their local catalogue accessible to services, and individuals, outside their own institution, as well as those working on virtual union catalogue development.
  16. Fang, L.: ¬A developing search service : heterogeneous resources integration and retrieval system (2004) 0.01 
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    Abstract
    This article describes two approaches for searching heterogeneous resources, which are explained as they are used in two corresponding existing systems-RIRS (Resource Integration Retrieval System) and HRUSP (Heterogeneous Resource Union Search Platform). On analyzing the existing systems, a possible framework-the MUSP (Multimetadata-Based Union Search Platform) is presented. Libraries now face a dilemma. On one hand, libraries subscribe to many types of database retrieval systems that are produced by various providers. The libraries build their data and information systems independently. This results in highly heterogeneous and distributed systems at the technical level (e.g., different operating systems and user interfaces) and at the conceptual level (e.g., the same objects are named using different terms). On the other hand, end users want to access all these heterogeneous data via a union interface, without having to know the structure of each information system or the different retrieval methods used by the systems. Libraries must achieve a harmony between information providers and users. In order to bridge the gap between the service providers and the users, it would seem that all source databases would need to be rebuilt according to a uniform data structure and query language, but this seems impossible. Fortunately, however, libraries and information and technology providers are now making an effort to find a middle course that meets the requirements of both data providers and users. They are doing this through resource integration.
  17. Smith, N.A.: ONE, OPAC network in Europe : taking a further step towards a Europe-wide information network (1995) 0.01 
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    Abstract
    OPAC Network in Europe (ONE) is a project aimed at providing users with better ways to access library OPACs and national catalogues and which will stimulate and facilitate internetworking between libraries in Europe. The project is based on SR/Z39.50 standards which enable users to search widely different computer systems across networks and offer end users the promise of greater ease of use through a solution to the proliferation of different user interfaces to library catalogues
  18. Neuroth, H.; Lepschy, P.: ¬Das EU-Projekt Renardus (2001) 0.01 
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    Date
    22. 6.2002 19:32:15
  19. Avrahami, T.T.; Yau, L.; Si, L.; Callan, J.P.: ¬The FedLemur project : Federated search in the real world (2006) 0.01 
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  20. Meiert, M.: Elektronische Publikationen an Hochschulen : Modellierung des elektronischen Publikationsprozesses am Beispiel der Universität Hildesheim (2006) 0.01 
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    Date
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