Search (1 results, page 1 of 1)

  • × author_ss:"Callan, J.P."
  • × 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) 0.02
    0.015853753 = product of:
      0.055488132 = sum of:
        0.020922182 = weight(_text_:web in 5271) [ClassicSimilarity], result of:
          0.020922182 = score(doc=5271,freq=2.0), product of:
            0.09670874 = queryWeight, product of:
              3.2635105 = idf(docFreq=4597, maxDocs=44218)
              0.029633347 = queryNorm
            0.21634221 = fieldWeight in 5271, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.2635105 = idf(docFreq=4597, maxDocs=44218)
              0.046875 = fieldNorm(doc=5271)
        0.00856136 = weight(_text_:information in 5271) [ClassicSimilarity], result of:
          0.00856136 = score(doc=5271,freq=4.0), product of:
            0.052020688 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.029633347 = queryNorm
            0.16457605 = fieldWeight in 5271, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.046875 = fieldNorm(doc=5271)
        0.01797477 = weight(_text_:retrieval in 5271) [ClassicSimilarity], result of:
          0.01797477 = score(doc=5271,freq=2.0), product of:
            0.08963835 = queryWeight, product of:
              3.024915 = idf(docFreq=5836, maxDocs=44218)
              0.029633347 = queryNorm
            0.20052543 = fieldWeight in 5271, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.024915 = idf(docFreq=5836, maxDocs=44218)
              0.046875 = fieldNorm(doc=5271)
        0.008029819 = product of:
          0.024089456 = sum of:
            0.024089456 = weight(_text_:22 in 5271) [ClassicSimilarity], result of:
              0.024089456 = score(doc=5271,freq=2.0), product of:
                0.103770934 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.029633347 = 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)
          0.33333334 = coord(1/3)
      0.2857143 = coord(4/14)
    
    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
    Source
    Journal of the American Society for Information Science and Technology. 57(2006) no.3, S.347-358