Search (10 results, page 1 of 1)

0.077281 = product of:
  0.154562 = sum of:
    0.154562 = sum of:
      0.11293115 = weight(_text_:headings in 5920) [ClassicSimilarity], result of:
        0.11293115 = score(doc=5920,freq=4.0), product of:
          0.24837378 = queryWeight, product of:
            4.849944 = idf(docFreq=940, maxDocs=44218)
            0.051211677 = queryNorm
          0.45468226 = fieldWeight in 5920, product of:
            2.0 = tf(freq=4.0), with freq of:
              4.0 = termFreq=4.0
            4.849944 = idf(docFreq=940, maxDocs=44218)
            0.046875 = fieldNorm(doc=5920)
      0.04163085 = weight(_text_:22 in 5920) [ClassicSimilarity], result of:
        0.04163085 = score(doc=5920,freq=2.0), product of:
          0.17933457 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.051211677 = queryNorm
          0.23214069 = fieldWeight in 5920, 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=5920)
  0.5 = coord(1/2)

Abstract

Library of Congress Subject Headings (LCSH), a system originally designed as a tool for subject access to the Library's own collection in the late nineteenth century, has become, in the course of the last century, the main subject retrieval tool in library catalogs throughout the United States and in many other countries. It is one of the largest non-specialized controlled vocabularies in the world. As LCSH enters a new century, it faces an information environment that has undergone vast changes from what had prevailed when LCSH began, or, indeed, from its state in the early days of the online age. In order to continue its mission and to be useful in spheres outside library catalogs as well, LCSH must adapt to the multifarious environment. One possible approach is to adopt a series of scalable and flexible syntax and application rules to meet the needs of different user communities

Date

27. 5.2001 16:22:21

Source

The LCSH century: one hundred years with the Library of Congress Subject Headings system. Ed.: A.T.Stone

0.060742617 = product of:
  0.12148523 = sum of:
    0.12148523 = sum of:
      0.079854384 = weight(_text_:headings in 2205) [ClassicSimilarity], result of:
        0.079854384 = score(doc=2205,freq=2.0), product of:
          0.24837378 = queryWeight, product of:
            4.849944 = idf(docFreq=940, maxDocs=44218)
            0.051211677 = queryNorm
          0.3215089 = fieldWeight in 2205, 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=2205)
      0.04163085 = weight(_text_:22 in 2205) [ClassicSimilarity], result of:
        0.04163085 = score(doc=2205,freq=2.0), product of:
          0.17933457 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.051211677 = queryNorm
          0.23214069 = fieldWeight in 2205, 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=2205)
  0.5 = coord(1/2)

Abstract

Form subdivisions have always been an important part of the Library of Congress Subject Headings. However, when the MARC format was developed, no separate subfield code to identify form subdivisions was defined. Form and topical subdivisions were both included within a general subdivision category. In 1995, the USMARC Advisory Group approved a proposal defining subfield v for form subdivisions, and in 1999 the Library of Congress (LC) began identifying form subdivisions with the new code. However, there are millions of older bibliographic records lacking the explicit form subdivision coding. Identifying form subdivisions retrospectively is not a simple task. An algorithmic method was developed to identify form subdivisions coded as general subdivisions. The algorithm was used to identify 2,563 unique form subdivisions or combinations of form subdivisions in OCLC's WorldCat. The algorithm proved to be highly accurate with an error rate estimated to be less than 0.1%. The observed usage of the form subdivisions was highly skewed with the 100 most used form subdivisions or combinations of subdivisions accounting for 90% of the assignments.

Date

10. 9.2000 17:38:22

0.04705465 = product of:
  0.0941093 = sum of:
    0.0941093 = product of:
      0.1882186 = sum of:
        0.1882186 = weight(_text_:headings in 4598) [ClassicSimilarity], result of:
          0.1882186 = score(doc=4598,freq=4.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.7578038 = fieldWeight in 4598, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.078125 = fieldNorm(doc=4598)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

The only comprehensive treatise an the Library of Congress Subject Headings system, now fully updated to address LCSH in the electronic environment.

0.037199963 = product of:
  0.074399926 = sum of:
    0.074399926 = product of:
      0.14879985 = sum of:
        0.14879985 = weight(_text_:headings in 3816) [ClassicSimilarity], result of:
          0.14879985 = score(doc=3816,freq=10.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.5990965 = fieldWeight in 3816, product of:
              3.1622777 = tf(freq=10.0), with freq of:
                10.0 = termFreq=10.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3816)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

The Library of Congress Subject Headings schema (LCSH) is by far the most commonly used and widely accepted subject vocabulary for general application. It is the de facto universal controlled vocabulary and has been a model for developing subject heading systems by many countries. However, LCSH's complex syntax and rules for constructing headings restrict its application by requiring highly skilled personnel and limit the effectiveness of automated authority control. Recent trends, driven to a large extent by the rapid growth of the Web, are forcing changes in bibliographic control systems to make them easier to use, understand, and apply, and subject headings are no exception. The purpose of adapting the LCSH with a simplified syntax to create FAST is to retain the very rich vocabulary of LCSH while making the schema easier to understand, control, apply, and use. The schema maintains upward compatibility with LCSH, and any valid set of LC subject headings can be converted to FAST headings.

0.034577962 = product of:
  0.069155924 = sum of:
    0.069155924 = product of:
      0.13831185 = sum of:
        0.13831185 = weight(_text_:headings in 2181) [ClassicSimilarity], result of:
          0.13831185 = score(doc=2181,freq=6.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.55686975 = fieldWeight in 2181, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.046875 = fieldNorm(doc=2181)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

Recent trends, driven to a large extent by the rapid proliferation of digital resources, are forcing changes in bibliographic control to make it easier to use, understand, and apply subject data. Subject headings are no exception. The enormous volume and rapid growth of digital libraries and repositories and the emergence of numerous metadata schemes have spurred a reexamination of the way subject data are to be provided for such resources efficiently and effectively. To address this need, OCLC in cooperation with the Library of Congress, has taken a new approach, called FAST (Faceted Application of Subject Terminology). FAST headings are based on the existing vocabulary in Library of Congress Subject Headings (LCSH), but are applied with a simpler syntax than required by Library of Congress application policies. Adapting the LCSH vocabulary in a simplified faceted syntax retains the rich vocabulary of LCSH while making it easier to understand, control, apply, and use.

0.034577962 = product of:
  0.069155924 = sum of:
    0.069155924 = product of:
      0.13831185 = sum of:
        0.13831185 = weight(_text_:headings in 2503) [ClassicSimilarity], result of:
          0.13831185 = score(doc=2503,freq=6.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.55686975 = fieldWeight in 2503, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.046875 = fieldNorm(doc=2503)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Content

The aim of this study is to develop a software tool, VisuaLCSH, for effective searching, browsing, and maintenance of LCSH. This tool enables visualizing subject headings and hierarchical structures implied and embedded in LCSH. A conceptual framework for converting the hierarchical structure of headings in LCSH to an explicit tree structure is proposed, described, and implemented. The highlights of VisuaLCSH are summarized below: 1) revealing multiple aspects of a heading; 2) normalizing the hierarchical relationships in LCSH; 3) showing multi-level hierarchies in LCSH sub-trees; 4) improving the navigational function of LCSH in retrieval; and 5) enabling the implementation of generic search, i.e., the 'exploding' feature, in searching LCSH.

0.03293825 = product of:
  0.0658765 = sum of:
    0.0658765 = product of:
      0.131753 = sum of:
        0.131753 = weight(_text_:headings in 6109) [ClassicSimilarity], result of:
          0.131753 = score(doc=6109,freq=4.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.5304626 = fieldWeight in 6109, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.0546875 = fieldNorm(doc=6109)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

This article describes FAST, the Faceted Application of Subject Terminology, a project at OCLC to make Library of Congress Subject Headings easier to use in Dublin Core metadata by breaking out facets of space, time, and form. Work on FAST can be watched at its web site, http://www.miskatonic.org/library/, which has recent presentations and reports. It is interesting to see facets and Dublin Core combined, though both LCSH and FAST subject headings are beyond what most people making a small faceted classification would want or need.

0.024284663 = product of:
  0.048569325 = sum of:
    0.048569325 = product of:
      0.09713865 = sum of:
        0.09713865 = weight(_text_:22 in 3247) [ClassicSimilarity], result of:
          0.09713865 = score(doc=3247,freq=2.0), product of:
            0.17933457 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.051211677 = queryNorm
            0.5416616 = fieldWeight in 3247, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.109375 = fieldNorm(doc=3247)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Object

DDC-22

0.018821858 = product of:
  0.037643716 = sum of:
    0.037643716 = product of:
      0.07528743 = sum of:
        0.07528743 = weight(_text_:headings in 3616) [ClassicSimilarity], result of:
          0.07528743 = score(doc=3616,freq=4.0), product of:
            0.24837378 = queryWeight, product of:
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.051211677 = queryNorm
            0.3031215 = fieldWeight in 3616, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.849944 = idf(docFreq=940, maxDocs=44218)
              0.03125 = fieldNorm(doc=3616)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

Purpose - The purpose of this paper is to investigate the linking of a folksonomy (user vocabulary) and LCSH (controlled vocabulary) on the basis of word matching, for the potential use of LCSH in bringing order to folksonomies. Design/methodology/approach - A selected sample of a folksonomy from a popular collaborative tagging system, Delicious, was word-matched with LCSH. LCSH was transformed into a tree structure called an LCSH tree for the matching. A close examination was conducted on the characteristics of folksonomies, the overlap of folksonomies with LCSH, and the distribution of folksonomies over the LCSH tree. Findings - The experimental results showed that the total proportion of tags being matched with LC subject headings constituted approximately two-thirds of all tags involved, with an additional 10 percent of the remaining tags having potential matches. A number of barriers for the linking as well as two areas in need of improving the matching are identified and described. Three important tag distribution patterns over the LCSH tree were identified and supported: skewedness, multifacet, and Zipfian-pattern. Research limitations/implications - The results of the study can be adopted for the development of innovative methods of mapping between folksonomy and LCSH, which directly contributes to effective access and retrieval of tagged web resources and to the integration of multiple information repositories based on the two vocabularies. Practical implications - The linking of controlled vocabularies can be applicable to enhance information retrieval capability within collaborative tagging systems as well as across various tagging system information depositories and bibliographic databases. Originality/value - This is among frontier works that examines the potential of linking a folksonomy, extracted from a collaborative tagging system, to an authority-maintained subject heading system. It provides exploratory data to support further advanced mapping methods for linking the two vocabularies.

0.010407712 = product of:
  0.020815425 = sum of:
    0.020815425 = product of:
      0.04163085 = sum of:
        0.04163085 = weight(_text_:22 in 3842) [ClassicSimilarity], result of:
          0.04163085 = score(doc=3842,freq=2.0), product of:
            0.17933457 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.051211677 = queryNorm
            0.23214069 = fieldWeight in 3842, 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=3842)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

27. 8.2011 14:22:42