Search (5 results, page 1 of 1)

  • × author_ss:"Guastavino, C."
  1. Julien, C.-A.; Tirilly, P.; Dinneen, J.D.; Guastavino, C.: Reducing subject tree browsing complexity (2013) 0.02 
    0.023527324 = product of:
  0.04705465 = sum of:
    0.04705465 = product of:
      0.0941093 = sum of:
        0.0941093 = weight(_text_:headings in 1102) [ClassicSimilarity], result of:
          0.0941093 = score(doc=1102,freq=4.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.3789019 = fieldWeight in 1102, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.0390625 = fieldNorm(doc=1102)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Abstract
    Many large digital collections are currently organized by subject; although useful, these information organization structures are large and complex and thus difficult to browse. Current online tools and visualization prototypes show small, localized subsets and do not provide the ability to explore the predominant patterns of the overall subject structure. This study describes subject tree modifications that facilitate browsing for documents by capitalizing on the highly uneven distribution of real-world collections. The approach is demonstrated on two large collections organized by the Library of Congress Subject Headings (LCSH) and Medical Subject Headings (MeSH). Results show that the LCSH subject tree can be reduced to 49% of its initial complexity while maintaining access to 83% of the collection, and the MeSH tree can be reduced to 45% of its initial complexity while maintaining access to 97% of the collection. A simple solution to negate the loss of access is discussed. The visual impact is demonstrated by using traditional outline views and a slider control allowing searchers to change the subject structure dynamically according to their needs. This study has implications for the development of information organization theory and human-information interaction techniques for subject trees.
  2. Julien, C.-A.; Tirilly, P.; Leide, J.E.; Guastavino, C.: Constructing a true LCSH tree of a science and engineering collection (2012) 0.02 
    0.019963596 = product of:
  0.039927192 = sum of:
    0.039927192 = product of:
      0.079854384 = sum of:
        0.079854384 = weight(_text_:headings in 512) [ClassicSimilarity], result of:
          0.079854384 = score(doc=512,freq=2.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.3215089 = fieldWeight in 512, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.046875 = fieldNorm(doc=512)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Abstract
    The Library of Congress Subject Headings (LCSH) is a subject structure used to index large library collections throughout the world. Browsing a collection through LCSH is difficult using current online tools in part because users cannot explore the structure using their existing experience navigating file hierarchies on their hard drives. This is due to inconsistencies in the LCSH structure, which does not adhere to the specific rules defining tree structures. This article proposes a method to adapt the LCSH structure to reflect a real-world collection from the domain of science and engineering. This structure is transformed into a valid tree structure using an automatic process. The analysis of the resulting LCSH tree shows a large and complex structure. The analysis of the distribution of information within the LCSH tree reveals a power law distribution where the vast majority of subjects contain few information items and a few subjects contain the vast majority of the collection.
  3. Julien, C.-A.; Tirilly, P.; Leide, J.E.; Guastavino, C.: Using the LCSH hierarchy to browse a collection (2012) 0.02 
    0.01663633 = product of:
  0.03327266 = sum of:
    0.03327266 = product of:
      0.06654532 = sum of:
        0.06654532 = weight(_text_:headings in 834) [ClassicSimilarity], result of:
          0.06654532 = score(doc=834,freq=2.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.2679241 = fieldWeight in 834, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.0390625 = fieldNorm(doc=834)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Abstract
    The Library of Congress Subject Headings (LCSH) is a subject structure used to index large collections throughout the world. Browsing a collection through LCSH is difficult using current on-line tools in part because they are inadequately integrated with information collections. Users of these LCSH browsing tools are expected to find a promising LCSH string before using it to search for the information itself; many users do not have the patience for such a two-step process. This article proposes a method to fully integrate a specific collection in its subset of the LCSH hierarchy in order to facilitate LCSH browsing as well as information retrieval. Techniques are described to match LCSH strings assigned to the collection with an established string from the authority records, and build their specific LCSH hierarchy. The resulting subset of LCSH structure is described in terms of its size and broader/narrower term statistics, and implications for browsing and information retrieval are discussed. The results of this research have implications for institutions wishing to further capitalize on existing LCSH organization investments for the purpose of subject browsing and information retrieval.
  4. Julien, C.-A.; Guastavino, C.; Bouthillier, F.: Capitalizing on information organization and information visualization for a new-generation catalogue (2012) 0.02 
    0.01663633 = product of:
  0.03327266 = sum of:
    0.03327266 = product of:
      0.06654532 = sum of:
        0.06654532 = weight(_text_:headings in 5567) [ClassicSimilarity], result of:
          0.06654532 = score(doc=5567,freq=2.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.2679241 = fieldWeight in 5567, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.0390625 = fieldNorm(doc=5567)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Abstract
    Subject searching is difficult with traditional text-based online public access library catalogues (OPACs), and the next-generation discovery layers are keyword searching and result filtering tools that offer little support for subject browsing. Next-generation OPACs ignore the rich network of relations offered by controlled subject vocabulary, which can facilitate subject browsing. A new generation of OPACs could leverage existing information-organization investments and offer online searchers a novel browsing and searching environment. This is a case study of the design and development of a virtual reality subject browsing and information retrieval tool. The functional prototype shows that the Library of Congress subject headings (LCSH) can be shaped into a useful and usable tree structure serving as a visual metaphor that contains a real world collection from the domain of science and engineering. Formative tests show that users can effectively browse the LCSH tree and carve it up based on their keyword search queries. This study uses a complex information-organization structure as a defining characteristic of an OPAC that goes beyond the standard keyword search model, toward the cutting edge of online search tools.
  5. Pras, A.; Guastavino, C.; Lavoie, M.: ¬The impact of technological advances on recording studio practices (2013) 0.01 
    0.008673094 = product of:
  0.017346188 = sum of:
    0.017346188 = product of:
      0.034692377 = sum of:
        0.034692377 = weight(_text_:22 in 670) [ClassicSimilarity], result of:
          0.034692377 = score(doc=670,freq=2.0), product of:
            0.17933457 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.051211677 = queryNorm
            0.19345059 = fieldWeight in 670, 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=670)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Date
    22. 3.2013 19:47:38

Authors

Themes