Search (18 results, page 1 of 1)

  • × theme_ss:"Verteilte bibliographische Datenbanken"
  1. Avrahami, T.T.; Yau, L.; Si, L.; Callan, J.P.: ¬The FedLemur project : Federated search in the real world (2006) 0.05 
    0.04742858 = product of:
  0.09485716 = sum of:
    0.07665128 = weight(_text_:engines in 5271) [ClassicSimilarity], result of:
      0.07665128 = score(doc=5271,freq=2.0), product of:
        0.22757743 = queryWeight, product of:
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.04479146 = queryNorm
        0.33681408 = fieldWeight in 5271, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.046875 = fieldNorm(doc=5271)
    0.018205874 = product of:
      0.036411747 = sum of:
        0.036411747 = weight(_text_:22 in 5271) [ClassicSimilarity], result of:
          0.036411747 = score(doc=5271,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.23214069 = fieldWeight in 5271, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=5271)
      0.5 = coord(1/2)
  0.5 = coord(2/4)
    Abstract
    Federated search and distributed information retrieval systems provide a single user interface for searching multiple full-text search engines. They have been an active area of research for more than a decade, but in spite of their success as a research topic, they are still rare in operational environments. This article discusses a prototype federated search system developed for the U.S. government's FedStats Web portal, and the issues addressed in adapting research solutions to this operational environment. A series of experiments explore how well prior research results, parameter settings, and heuristics apply in the FedStats environment. The article concludes with a set of lessons learned from this technology transfer effort, including observations about search engine quality in the real world.
    Date
    22. 7.2006 16:02:07
  2. Krause, J.: Heterogenität und Integration : Zur Weiterentwicklung von Inhaltserschließung und Retrieval in sich veränderten Kontexten (2001) 0.02 
    0.022583602 = product of:
  0.09033441 = sum of:
    0.09033441 = weight(_text_:engines in 6071) [ClassicSimilarity], result of:
      0.09033441 = score(doc=6071,freq=4.0), product of:
        0.22757743 = queryWeight, product of:
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.04479146 = queryNorm
        0.39693922 = fieldWeight in 6071, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.0390625 = fieldNorm(doc=6071)
  0.25 = coord(1/4)
    Abstract
    As an important support tool in science research, specialized information systems are rapidly changing their character. The potential for improvement compared with today's usual systems is enormous. This fact will be demonstrated by means of two problem complexes: - WWW search engines, which were developed without any government grants, are increasingly dominating the scene. Does the WWW displace information centers with their high quality databases? What are the results we can get nowadays using general WWW search engines? - In addition to the WWW and specialized databases, scientists now use WWW library catalogues of digital libraries, which combine the catalogues from an entire region or a country. At the same time, however, they are faced with highly decentralized heterogeneous databases which contain the widest range of textual sources and data, e.g. from surveys. One consequence is the presence of serious inconsistencies in quality, relevance and content analysis. Thus, the main problem to be solved is as follows: users must be supplied with heterogeneous data from different sources, modalities and content development processes via a visual user interface without inconsistencies in content development, for example, seriously impairing the quality of the search results, e. g. when phrasing their search inquiry in the terminology to which they are accustomed
  3. Smith, N.: Z39.50 and the OPAC Network in Europe (ONE) Project (1996) 0.02 
    0.022356624 = product of:
  0.089426495 = sum of:
    0.089426495 = weight(_text_:engines in 3195) [ClassicSimilarity], result of:
      0.089426495 = score(doc=3195,freq=2.0), product of:
        0.22757743 = queryWeight, product of:
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.04479146 = queryNorm
        0.39294976 = fieldWeight in 3195, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.0546875 = fieldNorm(doc=3195)
  0.25 = coord(1/4)
    Abstract
    Examines the use of the Z39.50 Information Retrieval protocol for provision of access to its collections. Z39.50 offers a translation of different search engines developed by library systems suppliers and online database hosts. Traces its development and describes its abstraction and metalanguage, and the TCP/IP and OSI layer. It is being further developed in project ONE - OPAC Network in Europe, and European Union Library Plan project which began in Jan 95, of which the British Library is a partner. It aims to link national library catalogues in an open standards and telecommunications network, and to achieve interoperability by use of Z39.50. Describes the project so far, agreements made, and future developments
  4. Croft, W.B.: Combining approaches to information retrieval (2000) 0.02 
    0.01916282 = product of:
  0.07665128 = sum of:
    0.07665128 = weight(_text_:engines in 6862) [ClassicSimilarity], result of:
      0.07665128 = score(doc=6862,freq=2.0), product of:
        0.22757743 = queryWeight, product of:
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.04479146 = queryNorm
        0.33681408 = fieldWeight in 6862, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          5.080822 = idf(docFreq=746, maxDocs=44218)
          0.046875 = fieldNorm(doc=6862)
  0.25 = coord(1/4)
    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
  5. Teets, M.; Murray, P.: Metasearch authentication and access management (2006) 0.01 
    0.013290926 = product of:
  0.053163704 = sum of:
    0.053163704 = product of:
      0.10632741 = sum of:
        0.10632741 = weight(_text_:programming in 1154) [ClassicSimilarity], result of:
          0.10632741 = score(doc=1154,freq=2.0), product of:
            0.29361802 = queryWeight, product of:
              6.5552235 = idf(docFreq=170, maxDocs=44218)
              0.04479146 = queryNorm
            0.36212835 = fieldWeight in 1154, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              6.5552235 = idf(docFreq=170, maxDocs=44218)
              0.0390625 = fieldNorm(doc=1154)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Abstract
    Metasearch - also called parallel search, federated search, broadcast search, and cross-database search - has become commonplace in the information community's vocabulary. All speak to a common theme of searching and retrieving from multiple databases, sources, platforms, protocols, and vendors at the point of the user's request. Metasearch services rely on a variety of approaches including open standards (such as NISO's Z39.50 and SRU/SRW), proprietary programming interfaces, and "screen scraping." However, the absence of widely supported standards, best practices, and tools makes the metasearch environment less efficient for the metasearch provider, the content provider, and ultimately the end-user. To spur the development of widely supported standards and best practices, the National Information Standards Organization (NISO) sponsored a Metasearch Initiative in 2003 to enable: * metasearch service providers to offer more effective and responsive services, * content providers to deliver enhanced content and protect their intellectual property, and * libraries to deliver a simple search (a.k.a. "Google") that covers the breadth of their vetted commercial and free resources. The Access Management Task Group was one of three groups chartered by NISO as part of the Metasearch Initiative. The focus of the group was on gathering requirements for Metasearch authentication and access needs, inventorying existing processes, developing a series of formal use cases describing the access needs, recommending best practices given today's processes, and recommending and pursing changes to current solutions to better support metasearch applications. In September 2005, the group issued their final report and recommendation. This article summarizes the group's work and final recommendation.
  6. Milanesi, C.: Möglichkeiten der Kooperation im Rahmen von Subject Gateways : das Euler-Projekt im Vergleich mit weiteren europäischen Projekten (2001) 0.01 
    0.009102937 = product of:
  0.036411747 = sum of:
    0.036411747 = product of:
      0.072823495 = sum of:
        0.072823495 = weight(_text_:22 in 4865) [ClassicSimilarity], result of:
          0.072823495 = score(doc=4865,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.46428138 = fieldWeight in 4865, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.09375 = fieldNorm(doc=4865)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    22. 6.2002 19:41:59
  7. Dupuis, P.; Lapointe, J.: Developpement d'un outil documentaire à Hydro-Quebec : le Thesaurus HQ (1997) 0.01 
    0.0060686246 = product of:
  0.024274498 = sum of:
    0.024274498 = product of:
      0.048548996 = sum of:
        0.048548996 = weight(_text_:22 in 3173) [ClassicSimilarity], result of:
          0.048548996 = score(doc=3173,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.30952093 = fieldWeight in 3173, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=3173)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Source
    Argus. 26(1997) no.3, S.16-22
  8. Dempsey, L.; Russell, R.; Kirriemur, J.W.: Towards distributed library systems : Z39.50 in a European context (1996) 0.01 
    0.0060686246 = product of:
  0.024274498 = sum of:
    0.024274498 = product of:
      0.048548996 = sum of:
        0.048548996 = weight(_text_:22 in 127) [ClassicSimilarity], result of:
          0.048548996 = score(doc=127,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.30952093 = fieldWeight in 127, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=127)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Source
    Program. 30(1996) no.1, S.1-22
  9. Ashton, J.: ONE: the final OPAC frontier (1998) 0.01 
    0.0060686246 = product of:
  0.024274498 = sum of:
    0.024274498 = product of:
      0.048548996 = sum of:
        0.048548996 = weight(_text_:22 in 2588) [ClassicSimilarity], result of:
          0.048548996 = score(doc=2588,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.30952093 = fieldWeight in 2588, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=2588)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Source
    Select newsletter. 1998, no.22, Spring, S.5-6
  10. Lunau, C.D.: Z39.50: a critical component of the Canadian resource sharing infrastructure : implementation activities and results achieved (1997) 0.01 
    0.0060686246 = product of:
  0.024274498 = sum of:
    0.024274498 = product of:
      0.048548996 = sum of:
        0.048548996 = weight(_text_:22 in 3193) [ClassicSimilarity], result of:
          0.048548996 = score(doc=3193,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.30952093 = fieldWeight in 3193, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=3193)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    3. 3.1999 17:22:57
  11. Burrows, T.: ¬The virtual catalogue : bibliographic access for the virtual library (1993) 0.01 
    0.0060686246 = product of:
  0.024274498 = sum of:
    0.024274498 = product of:
      0.048548996 = sum of:
        0.048548996 = weight(_text_:22 in 5286) [ClassicSimilarity], result of:
          0.048548996 = score(doc=5286,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.30952093 = fieldWeight in 5286, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=5286)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    8.10.2000 14:47:22
  12. 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 
    0.005363957 = product of:
  0.021455828 = sum of:
    0.021455828 = product of:
      0.042911656 = sum of:
        0.042911656 = weight(_text_:22 in 5801) [ClassicSimilarity], result of:
          0.042911656 = score(doc=5801,freq=4.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.27358043 = fieldWeight in 5801, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=5801)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    22. 6.2002 19:42:22
  13. Heery, R.: Information gateways : collaboration and content (2000) 0.01 
    0.0053100465 = product of:
  0.021240186 = sum of:
    0.021240186 = product of:
      0.042480372 = sum of:
        0.042480372 = weight(_text_:22 in 4866) [ClassicSimilarity], result of:
          0.042480372 = score(doc=4866,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.2708308 = fieldWeight in 4866, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0546875 = fieldNorm(doc=4866)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    22. 6.2002 19:38:54
  14. Neuroth, H.; Lepschy, P.: ¬Das EU-Projekt Renardus (2001) 0.00 
    0.0045514684 = product of:
  0.018205874 = sum of:
    0.018205874 = product of:
      0.036411747 = sum of:
        0.036411747 = weight(_text_:22 in 5589) [ClassicSimilarity], result of:
          0.036411747 = score(doc=5589,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.23214069 = fieldWeight in 5589, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=5589)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    22. 6.2002 19:32:15
  15. Meiert, M.: Elektronische Publikationen an Hochschulen : Modellierung des elektronischen Publikationsprozesses am Beispiel der Universität Hildesheim (2006) 0.00 
    0.0045514684 = product of:
  0.018205874 = sum of:
    0.018205874 = product of:
      0.036411747 = sum of:
        0.036411747 = weight(_text_:22 in 5974) [ClassicSimilarity], result of:
          0.036411747 = score(doc=5974,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.23214069 = fieldWeight in 5974, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=5974)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    1. 9.2006 13:22:15
  16. Nicholson, D.; Steele, M.: CATRIONA : a distributed, locally-oriented, Z39.50 OPAC-based approach to cataloguing the Internet (1996) 0.00 
    0.0045514684 = product of:
  0.018205874 = sum of:
    0.018205874 = product of:
      0.036411747 = sum of:
        0.036411747 = weight(_text_:22 in 603) [ClassicSimilarity], result of:
          0.036411747 = score(doc=603,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.23214069 = fieldWeight in 603, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=603)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Source
    Cataloging and classification quarterly. 22(1996) nos.3/4, S.127-141
  17. Johnson, E.H.: Objects for distributed heterogeneous information retrieval (2000) 0.00 
    0.0037928906 = product of:
  0.015171562 = sum of:
    0.015171562 = product of:
      0.030343125 = sum of:
        0.030343125 = weight(_text_:22 in 6959) [ClassicSimilarity], result of:
          0.030343125 = score(doc=6959,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.19345059 = fieldWeight in 6959, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=6959)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    22. 9.1997 19:16:05
  18. Subject retrieval in a networked environment : Proceedings of the IFLA Satellite Meeting held in Dublin, OH, 14-16 August 2001 and sponsored by the IFLA Classification and Indexing Section, the IFLA Information Technology Section and OCLC (2003) 0.00 
    0.0015171561 = product of:
  0.0060686246 = sum of:
    0.0060686246 = product of:
      0.012137249 = sum of:
        0.012137249 = weight(_text_:22 in 3964) [ClassicSimilarity], result of:
          0.012137249 = score(doc=3964,freq=2.0), product of:
            0.15685207 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04479146 = queryNorm
            0.07738023 = fieldWeight in 3964, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.015625 = fieldNorm(doc=3964)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Footnote
    Rez. in: KO 31(2004) no.2, S.117-118 (D. Campbell): "This excellent volume offers 22 papers delivered at an IFLA Satellite meeting in Dublin Ohio in 2001. The conference gathered together information and computer scientists to discuss an important and difficult question: in what specific ways can the accumulated skills, theories and traditions of librarianship be mobilized to face the challenges of providing subject access to information in present and future networked information environments? The papers which grapple with this question are organized in a surprisingly deft and coherent way. Many conferences and proceedings have unhappy sessions that contain a hodge-podge of papers that didn't quite fit any other categories. As befits a good classificationist, editor I.C. McIlwaine has kept this problem to a minimum. The papers are organized into eight sessions, which split into two broad categories. The first five sessions deal with subject domains, and the last three deal with subject access tools. The five sessions and thirteen papers that discuss access in different domains appear in order of in creasing intension. The first papers deal with access in multilingual environments, followed by papers an access across multiple vocabularies and across sectors, ending up with studies of domain-specific retrieval (primarily education). Some of the papers offer predictably strong work by scholars engaged in ongoing, long-term research. Gerard Riesthuis offers a clear analysis of the complexities of negotiating non-identical thesauri, particularly in cases where hierarchical structure varies across different languages. Hope Olson and Dennis Ward use Olson's familiar and welcome method of using provocative and unconventional theory to generate meliorative approaches to blas in general subject access schemes. Many papers, an the other hand, deal with specific ongoing projects: Renardus, The High Level Thesaurus Project, The Colorado Digitization Project and The Iter Bibliography for medieval and Renaissance material. Most of these papers display a similar structure: an explanation of the theory and purpose of the project, an account of problems encountered in the implementation, and a discussion of the results, both promising and disappointing, thus far. Of these papers, the account of the Multilanguage Access to Subjects Project in Europe (MACS) deserves special mention. In describing how the project is founded an the principle of the equality of languages, with each subject heading language maintained in its own database, and with no single language used as a pivot for the others, Elisabeth Freyre and Max Naudi offer a particularly vivid example of the way the ethics of librarianship translate into pragmatic contexts and concrete procedures. The three sessions and nine papers devoted to subject access tools split into two kinds: papers that discuss the use of theory and research to generate new tools for a networked environment, and those that discuss the transformation of traditional subject access tools in this environment. In the new tool development area, Mary Burke provides a promising example of the bidirectional approach that is so often necessary: in her case study of user-driven classification of photographs, she user personal construct theory to clarify the practice of classification, while at the same time using practice to test the theory. Carol Bean and Rebecca Green offer an intriguing combination of librarianship and computer science, importing frame representation technique from artificial intelligence to standardize syntagmatic relationships to enhance recall and precision.

Authors

Years

Languages

Types

Themes