Search (63 results, page 1 of 4)

0.01951047 = product of:
  0.13657328 = sum of:
    0.07725957 = weight(_text_:bibliothek in 949) [ClassicSimilarity], result of:
      0.07725957 = score(doc=949,freq=2.0), product of:
        0.121660605 = queryWeight, product of:
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.029633347 = queryNorm
        0.63504183 = fieldWeight in 949, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.109375 = fieldNorm(doc=949)
    0.05931371 = weight(_text_:retrieval in 949) [ClassicSimilarity], result of:
      0.05931371 = score(doc=949,freq=4.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.6617001 = fieldWeight in 949, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.109375 = fieldNorm(doc=949)
  0.14285715 = coord(2/14)

Theme

Verbale Doksprachen im Online-Retrieval
Klassifikationssysteme im Online-Retrieval

0.017993664 = product of:
  0.083970435 = sum of:
    0.046783425 = weight(_text_:web in 5698) [ClassicSimilarity], result of:
      0.046783425 = score(doc=5698,freq=10.0), product of:
        0.09670874 = queryWeight, product of:
          3.2635105 = idf(docFreq=4597, maxDocs=44218)
          0.029633347 = queryNorm
        0.48375595 = fieldWeight in 5698, product of:
          3.1622777 = tf(freq=10.0), with freq of:
            10.0 = termFreq=10.0
          3.2635105 = idf(docFreq=4597, maxDocs=44218)
          0.046875 = fieldNorm(doc=5698)
    0.0060537956 = weight(_text_:information in 5698) [ClassicSimilarity], result of:
      0.0060537956 = score(doc=5698,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.116372846 = fieldWeight in 5698, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.046875 = fieldNorm(doc=5698)
    0.031133216 = weight(_text_:retrieval in 5698) [ClassicSimilarity], result of:
      0.031133216 = score(doc=5698,freq=6.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.34732026 = fieldWeight in 5698, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=5698)
  0.21428572 = coord(3/14)

Abstract

Describes the shortcomings of search engines for the WWW comparing their current capabilities to those of the first generation CD-ROM products. Some allow phrase searching and most are improving their Boolean searching. Few allow truncation, wild cards or nested logic. They are stateless, losing previous search criteria. Unlike the indexing and classification systems for today's CD-ROMs, those for Web pages are random, unstructured and of variable quality. Considers that at best Web search engines can only offer free text searching. Discusses whether automatic data classification systems such as Infoseek Ultra can overcome the haphazard nature of the Web with neural network technology, and whether Boolean search techniques may be redundant when replaced by technology such as the Euroferret search engine. However, artificial intelligence is rarely successful on huge, varied databases. Relevance ranking and automatic query expansion still use the same simple inverted indexes. Most Web search engines do nothing more than word counting. Further complications arise with foreign languages

Source

Information world review. 1996, no.120, S.47-48

Theme

Verbale Doksprachen im Online-Retrieval
Klassifikationssysteme im Online-Retrieval
Semantisches Umfeld in Indexierung u. Retrieval

0.017028673 = product of:
  0.1192007 = sum of:
    0.07725957 = weight(_text_:bibliothek in 149) [ClassicSimilarity], result of:
      0.07725957 = score(doc=149,freq=2.0), product of:
        0.121660605 = queryWeight, product of:
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.029633347 = queryNorm
        0.63504183 = fieldWeight in 149, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.109375 = fieldNorm(doc=149)
    0.04194113 = weight(_text_:retrieval in 149) [ClassicSimilarity], result of:
      0.04194113 = score(doc=149,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.46789268 = fieldWeight in 149, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.109375 = fieldNorm(doc=149)
  0.14285715 = coord(2/14)

Source

Bibliothek: Forschung und Praxis. 14(1990), S.316-318

Theme

Verbale Doksprachen im Online-Retrieval

0.01672326 = product of:
  0.117062815 = sum of:
    0.06622249 = weight(_text_:bibliothek in 1301) [ClassicSimilarity], result of:
      0.06622249 = score(doc=1301,freq=2.0), product of:
        0.121660605 = queryWeight, product of:
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.029633347 = queryNorm
        0.54432154 = fieldWeight in 1301, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.09375 = fieldNorm(doc=1301)
    0.050840326 = weight(_text_:retrieval in 1301) [ClassicSimilarity], result of:
      0.050840326 = score(doc=1301,freq=4.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.5671716 = fieldWeight in 1301, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.09375 = fieldNorm(doc=1301)
  0.14285715 = coord(2/14)

Source

Bibliothek. Forschung und Praxis. 14(1990), S.193-225

Theme

Verbale Doksprachen im Online-Retrieval
Klassifikationssysteme im Online-Retrieval

0.014739482 = product of:
  0.10317637 = sum of:
    0.07321842 = weight(_text_:elektronische in 3416) [ClassicSimilarity], result of:
      0.07321842 = score(doc=3416,freq=2.0), product of:
        0.14013545 = queryWeight, product of:
          4.728978 = idf(docFreq=1061, maxDocs=44218)
          0.029633347 = queryNorm
        0.5224832 = fieldWeight in 3416, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.728978 = idf(docFreq=1061, maxDocs=44218)
          0.078125 = fieldNorm(doc=3416)
    0.029957948 = weight(_text_:retrieval in 3416) [ClassicSimilarity], result of:
      0.029957948 = score(doc=3416,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.33420905 = fieldWeight in 3416, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.078125 = fieldNorm(doc=3416)
  0.14285715 = coord(2/14)

Source

85. Deutscher Bibliothekartag in Göttingen 1995: Die Herausforderung der Bibliotheken durch elektronische Medien und neue Organisationsformen. Hrsg.: S. Wefers

Theme

Verbale Doksprachen im Online-Retrieval

0.010835126 = product of:
  0.05056392 = sum of:
    0.033454377 = weight(_text_:bibliothek in 4360) [ClassicSimilarity], result of:
      0.033454377 = score(doc=4360,freq=6.0), product of:
        0.121660605 = queryWeight, product of:
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.029633347 = queryNorm
        0.27498117 = fieldWeight in 4360, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.02734375 = fieldNorm(doc=4360)
    0.010485282 = weight(_text_:retrieval in 4360) [ClassicSimilarity], result of:
      0.010485282 = score(doc=4360,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.11697317 = fieldWeight in 4360, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02734375 = fieldNorm(doc=4360)
    0.006624263 = product of:
      0.019872788 = sum of:
        0.019872788 = weight(_text_:22 in 4360) [ClassicSimilarity], result of:
          0.019872788 = score(doc=4360,freq=4.0), product of:
            0.103770934 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.029633347 = queryNorm
            0.19150631 = fieldWeight in 4360, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.02734375 = fieldNorm(doc=4360)
      0.33333334 = coord(1/3)
  0.21428572 = coord(3/14)

Date

15. 7.2018 16:22:16

Footnote

Rez. in: Mitteilungen VÖB 48(1995) H.1, S.66-68 (K. Niedermair) - Vgl. auch Lepsky, K. in: Bibliotheksdienst 29(1995) H.3, S.500-519; Bibliothek: Forschung u. Praxis 19(1995) H.2, S.251-254 (G. Hartwieg; auch in: LDV-Forum Bd. 12, Nr. 2, Jg. 1995, S.22-29 [unter: http://www.jlcl.org/1995_Heft2/Rezensionen_19-27.pdf]) .

RSWK

Sacherschließung / Bibliothek (ÖVK)

Subject

Sacherschließung / Bibliothek (ÖVK)

Theme

Verbale Doksprachen im Online-Retrieval

0.00973067 = product of:
  0.06811468 = sum of:
    0.044148326 = weight(_text_:bibliothek in 1031) [ClassicSimilarity], result of:
      0.044148326 = score(doc=1031,freq=2.0), product of:
        0.121660605 = queryWeight, product of:
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.029633347 = queryNorm
        0.36288103 = fieldWeight in 1031, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.1055303 = idf(docFreq=1980, maxDocs=44218)
          0.0625 = fieldNorm(doc=1031)
    0.023966359 = weight(_text_:retrieval in 1031) [ClassicSimilarity], result of:
      0.023966359 = score(doc=1031,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.26736724 = fieldWeight in 1031, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0625 = fieldNorm(doc=1031)
  0.14285715 = coord(2/14)

Source

Bibliothek aktuell. 1995, H.65, S.11-13

Theme

Verbale Doksprachen im Online-Retrieval

0.008992559 = product of:
  0.062947914 = sum of:
    0.012107591 = weight(_text_:information in 2098) [ClassicSimilarity], result of:
      0.012107591 = score(doc=2098,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.23274569 = fieldWeight in 2098, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.09375 = fieldNorm(doc=2098)
    0.050840326 = weight(_text_:retrieval in 2098) [ClassicSimilarity], result of:
      0.050840326 = score(doc=2098,freq=4.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.5671716 = fieldWeight in 2098, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.09375 = fieldNorm(doc=2098)
  0.14285715 = coord(2/14)

Theme

Verbale Doksprachen im Online-Retrieval

0.00885405 = product of:
  0.061978348 = sum of:
    0.010089659 = weight(_text_:information in 2184) [ClassicSimilarity], result of:
      0.010089659 = score(doc=2184,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.19395474 = fieldWeight in 2184, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.078125 = fieldNorm(doc=2184)
    0.05188869 = weight(_text_:retrieval in 2184) [ClassicSimilarity], result of:
      0.05188869 = score(doc=2184,freq=6.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.5788671 = fieldWeight in 2184, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.078125 = fieldNorm(doc=2184)
  0.14285715 = coord(2/14)

Theme

Verbale Doksprachen im Online-Retrieval

0.008708881 = product of:
  0.060962167 = sum of:
    0.014551513 = weight(_text_:information in 1545) [ClassicSimilarity], result of:
      0.014551513 = score(doc=1545,freq=26.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.2797255 = fieldWeight in 1545, product of:
          5.0990195 = tf(freq=26.0), with freq of:
            26.0 = termFreq=26.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.03125 = fieldNorm(doc=1545)
    0.046410654 = weight(_text_:retrieval in 1545) [ClassicSimilarity], result of:
      0.046410654 = score(doc=1545,freq=30.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.51775444 = fieldWeight in 1545, product of:
          5.477226 = tf(freq=30.0), with freq of:
            30.0 = termFreq=30.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.03125 = fieldNorm(doc=1545)
  0.14285715 = coord(2/14)

Abstract

Information or Document Retrieval is the subject of this book. It is not an introductory book, although it is self-contained in the sense that it is not necessary to have a background in the theory or practice of Information Retrieval in order to understand its arguments. The book presents, as clearly as possible, one particular perspective on Information Retrieval, and attempts to say that certain aspects of the theory or practice of the management of documents are more important than others. The majority of Information Retrieval research has been aimed at the more experimentally tractable small-scale systems, and although much of that work has added greatly to our understanding of Information Retrieval it is becoming increasingly apparent that retrieval systems with large data bases of documents are a fundamentally different genre of systems than small-scale systems. If this is so, which is the thesis of this book, then we must now study large information retrieval systems with the same rigor and intensity that we once studied small-scale systems. Hegel observed that the quantitative growth of any system caused qualitative changes to take place in its structure and processes.

COMPASS

Information retrieval

LCSH

Information Retrieval

RSWK

Information Retrieval

Subject

Information retrieval
Information Retrieval
Information Retrieval

Theme

Verbale Doksprachen im Online-Retrieval

0.008009522 = product of:
  0.05606665 = sum of:
    0.014125523 = weight(_text_:information in 1330) [ClassicSimilarity], result of:
      0.014125523 = score(doc=1330,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.27153665 = fieldWeight in 1330, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.109375 = fieldNorm(doc=1330)
    0.04194113 = weight(_text_:retrieval in 1330) [ClassicSimilarity], result of:
      0.04194113 = score(doc=1330,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.46789268 = fieldWeight in 1330, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.109375 = fieldNorm(doc=1330)
  0.14285715 = coord(2/14)

Source

Encyclopedia of library and information science. Vol.45, [=Suppl.10]

Theme

Verbale Doksprachen im Online-Retrieval

0.008009522 = product of:
  0.05606665 = sum of:
    0.014125523 = weight(_text_:information in 1284) [ClassicSimilarity], result of:
      0.014125523 = score(doc=1284,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.27153665 = fieldWeight in 1284, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.109375 = fieldNorm(doc=1284)
    0.04194113 = weight(_text_:retrieval in 1284) [ClassicSimilarity], result of:
      0.04194113 = score(doc=1284,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.46789268 = fieldWeight in 1284, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.109375 = fieldNorm(doc=1284)
  0.14285715 = coord(2/14)

Source

Encyclopedia of library and information science. Vol.50, [=Suppl.13]

Theme

Verbale Doksprachen im Online-Retrieval

0.0075129103 = product of:
  0.05259037 = sum of:
    0.00856136 = weight(_text_:information in 2323) [ClassicSimilarity], result of:
      0.00856136 = score(doc=2323,freq=4.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.16457605 = fieldWeight in 2323, 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=2323)
    0.044029012 = weight(_text_:retrieval in 2323) [ClassicSimilarity], result of:
      0.044029012 = score(doc=2323,freq=12.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.49118498 = fieldWeight in 2323, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=2323)
  0.14285715 = coord(2/14)

Abstract

Partial coordination is a new method for cataloging documents for subject access. It is especially designed to enhance the precision of document searches in online environments. This article reports a preliminary evaluation of partial coordination that shows promising results compared with full-text retrieval. We also report the difficulties in empirically evaluating the effectiveness of automatic full-text retrieval in contrast to mixed methods such as partial coordination which combine human cataloging with computerized retrieval. Based on our study, we propose research in this area will substantially benefit from a common framework for failure analysis and a common data set. This will allow information retrieval researchers adapting 'library style'cataloging to large electronic document collections, as well as those developing automated or mixed methods, to directly compare their proposals for indexing and retrieval. This article concludes by suggesting guidelines for constructing such as testbed

Source

Journal of the American Society for Information Science. 49(1998) no.14, S.1270-1282

Theme

Verbale Doksprachen im Online-Retrieval

0.0074184835 = product of:
  0.05192938 = sum of:
    0.009988253 = weight(_text_:information in 863) [ClassicSimilarity], result of:
      0.009988253 = score(doc=863,freq=4.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.1920054 = fieldWeight in 863, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0546875 = fieldNorm(doc=863)
    0.04194113 = weight(_text_:retrieval in 863) [ClassicSimilarity], result of:
      0.04194113 = score(doc=863,freq=8.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.46789268 = fieldWeight in 863, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=863)
  0.14285715 = coord(2/14)

LCSH

Information retrieval

Subject

Information retrieval

Theme

Klassifikationssysteme im Online-Retrieval
Verbale Doksprachen im Online-Retrieval

0.007083241 = product of:
  0.049582683 = sum of:
    0.008071727 = weight(_text_:information in 2642) [ClassicSimilarity], result of:
      0.008071727 = score(doc=2642,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.1551638 = fieldWeight in 2642, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0625 = fieldNorm(doc=2642)
    0.041510954 = weight(_text_:retrieval in 2642) [ClassicSimilarity], result of:
      0.041510954 = score(doc=2642,freq=6.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.46309367 = fieldWeight in 2642, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0625 = fieldNorm(doc=2642)
  0.14285715 = coord(2/14)

Abstract

In online retrieval search results do not always match the intent in spite of using correct keywords (descriptors). One of the causes of this problem is found in the hierarchical structures of the thesaurus, which often contains relations between broader and narrower concepts, the opposite of which is not necessarily true. Some examples are described from 2 thesauri, MeSH and JICST. In these cases searchers need to make an effort to increase precision

Theme

Verbale Doksprachen im Online-Retrieval

0.006865305 = product of:
  0.04805713 = sum of:
    0.012107591 = weight(_text_:information in 154) [ClassicSimilarity], result of:
      0.012107591 = score(doc=154,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.23274569 = fieldWeight in 154, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.09375 = fieldNorm(doc=154)
    0.03594954 = weight(_text_:retrieval in 154) [ClassicSimilarity], result of:
      0.03594954 = score(doc=154,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.40105087 = fieldWeight in 154, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.09375 = fieldNorm(doc=154)
  0.14285715 = coord(2/14)

Source

Journal of the American Society for information Science. 41(1990) no.8, S.547-559

Theme

Verbale Doksprachen im Online-Retrieval

0.0068057464 = product of:
  0.03176015 = sum of:
    0.010089659 = weight(_text_:information in 2337) [ClassicSimilarity], result of:
      0.010089659 = score(doc=2337,freq=8.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.19395474 = fieldWeight in 2337, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2337)
    0.014978974 = weight(_text_:retrieval in 2337) [ClassicSimilarity], result of:
      0.014978974 = score(doc=2337,freq=2.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.16710453 = fieldWeight in 2337, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2337)
    0.0066915164 = product of:
      0.020074548 = sum of:
        0.020074548 = weight(_text_:22 in 2337) [ClassicSimilarity], result of:
          0.020074548 = score(doc=2337,freq=2.0), product of:
            0.103770934 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.029633347 = queryNorm
            0.19345059 = fieldWeight in 2337, 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=2337)
      0.33333334 = coord(1/3)
  0.21428572 = coord(3/14)

Abstract

Despite early claims to the contemporary, thesauri continue to find use as access tools for information in the full-text environment. Their mode of use is changing, but this change actually represents an expansion rather than a contrdiction of their utility. Thesauri and similar vocabulary tools can complement full-text access by aiding users in focusing their searches, by supplementing the linguistic analysis of the text search engine, and even by serving as one of the tools used by the linguistic engine for its analysis. While human indexing contunues to be used for many databases, the trend is to increase the use of machine aids for this purpose. All machine-aided indexing (MAI) systems rely on thesauri as the basis for term selection. In the 21st century, the balance of effort between human and machine will change at both input and output, but thesauri will continue to play an important role for the foreseeable future

Date

22. 9.1997 19:16:05

Imprint

Urbana-Champaign, IL : Illinois University at Urbana-Champaign, Graduate School of Library and Information Science

Source

Visualizing subject access for 21st century information resources: Papers presented at the 1997 Clinic on Library Applications of Data Processing, 2-4 Mar 1997, Graduate School of Library and Information Science, University of Illinois at Urbana-Champaign. Ed.: P.A. Cochrane et al

Theme

Verbale Doksprachen im Online-Retrieval

0.0063587003 = product of:
  0.0445109 = sum of:
    0.00856136 = weight(_text_:information in 386) [ClassicSimilarity], result of:
      0.00856136 = score(doc=386,freq=4.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.16457605 = fieldWeight in 386, 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=386)
    0.03594954 = weight(_text_:retrieval in 386) [ClassicSimilarity], result of:
      0.03594954 = score(doc=386,freq=8.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.40105087 = fieldWeight in 386, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=386)
  0.14285715 = coord(2/14)

Abstract

Using subject headings for Online Retrieval is an indispensable tool for online system desingners who are developing new systems or refining exicting ones. The book describes subject analysis and subject searching in online catalogs, including the limitations of retrieval, and demonstrates how such limitations can be overcome through system design and programming. The book describes the Library of Congress Subject headings system and system characteristics, shows how information is stored in machine readable files, and offers examples of and recommendations for successful methods. Tables are included to support these recommendations, and diagrams, graphs, and bar charts are used to provide results of data analyses.

Footnote

Rez. in: Information processing and management 31(1995) no.3, S.450-451 (R.R. Larson); Library resources and technical services 41(1997) no.1, S.60-67 (B.H. Weinberg)

Theme

Verbale Doksprachen im Online-Retrieval

0.00599504 = product of:
  0.041965276 = sum of:
    0.008071727 = weight(_text_:information in 4322) [ClassicSimilarity], result of:
      0.008071727 = score(doc=4322,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.1551638 = fieldWeight in 4322, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0625 = fieldNorm(doc=4322)
    0.033893548 = weight(_text_:retrieval in 4322) [ClassicSimilarity], result of:
      0.033893548 = score(doc=4322,freq=4.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.37811437 = fieldWeight in 4322, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0625 = fieldNorm(doc=4322)
  0.14285715 = coord(2/14)

Abstract

In der vorliegenden Form können die RSWK nicht befriedigen. Die geforderte hochdifferenzierte Erschließung ist in einem OPAC wegen der vielfältigen Abfragemöglichkeiten gar nicht nötig, ja eine einheitliche Indexierung und effiziente Suche is aufgrund der komplexen Regeln sogar erschwert. Aufgaben und Probleme der verbalen Sacherschließung in OPACs werden in dieser Arbeit aufgezeigt und Ansätze zu einer Alternative diskutiert. Der traditionelle Indexkatalog hat als Ergänzung des modernen Information Retrieval nur eine Zukunft, wenn die Möglichkeiten der EDV und der Faktor Mensch bei der Regelwerkentwicklung besser berücksichtigt werden

Theme

Verbale Doksprachen im Online-Retrieval

0.00531243 = product of:
  0.03718701 = sum of:
    0.0060537956 = weight(_text_:information in 2230) [ClassicSimilarity], result of:
      0.0060537956 = score(doc=2230,freq=2.0), product of:
        0.052020688 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.029633347 = queryNorm
        0.116372846 = fieldWeight in 2230, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.046875 = fieldNorm(doc=2230)
    0.031133216 = weight(_text_:retrieval in 2230) [ClassicSimilarity], result of:
      0.031133216 = score(doc=2230,freq=6.0), product of:
        0.08963835 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.029633347 = queryNorm
        0.34732026 = fieldWeight in 2230, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=2230)
  0.14285715 = coord(2/14)

Abstract

Experimental evidence suggests that enhancing the subject content of OPAC records can improve retrieval performance. This is based on the use of natural language index terms derived from the table of contents and back-of-the-book index of documents. The research reported here investigates the alternative approach of translating these natural language terms into controlled vocabulary. Subject queries were collected by interview at the catalogue, and indexing of the queries demonstrated the impressive ability of PRECIS, and to a lesser extent LCSH, to represent users' information needs. DDC performed poorly in this respect. The assumption was made that an index language adequately specific to represent users' queries should be adequate to represent document contents. Searches were carried out on three test databases, and both natural language and PRECIS enhancement of MARC records increased the number of relevant documents found, with PRECIS showing the better performance. However, with weak stemming the advantage of PRECIS was lost. Consideration must also be given to the potential advantages of controlled vocabulary, over and above basic retrieval performance measures

Theme

Verbale Doksprachen im Online-Retrieval