Search (122 results, page 1 of 7)

0.01681321 = product of:
  0.058846228 = sum of:
    0.022816047 = weight(_text_:system in 5920) [ClassicSimilarity], result of:
      0.022816047 = score(doc=5920,freq=4.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.29527056 = fieldWeight in 5920, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.046875 = fieldNorm(doc=5920)
    0.0050120843 = weight(_text_:information in 5920) [ClassicSimilarity], result of:
      0.0050120843 = score(doc=5920,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.116372846 = fieldWeight in 5920, 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=5920)
    0.021045974 = weight(_text_:retrieval in 5920) [ClassicSimilarity], result of:
      0.021045974 = score(doc=5920,freq=4.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.2835858 = fieldWeight in 5920, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=5920)
    0.009972124 = product of:
      0.019944249 = sum of:
        0.019944249 = weight(_text_:22 in 5920) [ClassicSimilarity], result of:
          0.019944249 = score(doc=5920,freq=2.0), product of:
            0.085914485 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.02453417 = 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)
  0.2857143 = coord(4/14)

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

Theme

Verbale Doksprachen im Online-Retrieval

0.015795203 = product of:
  0.07371095 = sum of:
    0.026618723 = weight(_text_:system in 828) [ClassicSimilarity], result of:
      0.026618723 = score(doc=828,freq=4.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.34448233 = fieldWeight in 828, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0546875 = fieldNorm(doc=828)
    0.008269517 = weight(_text_:information in 828) [ClassicSimilarity], result of:
      0.008269517 = score(doc=828,freq=4.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.1920054 = fieldWeight in 828, 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=828)
    0.038822707 = weight(_text_:retrieval in 828) [ClassicSimilarity], result of:
      0.038822707 = score(doc=828,freq=10.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.5231199 = fieldWeight in 828, product of:
          3.1622777 = tf(freq=10.0), with freq of:
            10.0 = termFreq=10.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=828)
  0.21428572 = coord(3/14)

Abstract

Designing research on the retrieval effectiveness of computer searches on PRECIS compared with retrieval effectiveness of searches on other types of subject analysis used in computer-based information sources is a complex process. This paper explores the complexity of measuring comparative retrieval effectiveness through a comparison of the subject analysis provided by the PRECIS system for fifty articles with the subject analysis provided for the same articles by three computer-based information sources: ERIC/CIJE, LLBA/Online and PsycINFO. Objectives are: (1) to discover factors that should be taken into account when designing this type of research; and (2) to identify extraneous variables that work against internal validity in research design .

Theme

Preserved Context Index System (PRECIS)
Verbale Doksprachen im Online-Retrieval

0.015052002 = product of:
  0.052682005 = sum of:
    0.022816047 = weight(_text_:system in 3837) [ClassicSimilarity], result of:
      0.022816047 = score(doc=3837,freq=4.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.29527056 = fieldWeight in 3837, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.046875 = fieldNorm(doc=3837)
    0.0050120843 = weight(_text_:information in 3837) [ClassicSimilarity], result of:
      0.0050120843 = score(doc=3837,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.116372846 = fieldWeight in 3837, 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=3837)
    0.014881751 = weight(_text_:retrieval in 3837) [ClassicSimilarity], result of:
      0.014881751 = score(doc=3837,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.20052543 = fieldWeight in 3837, 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=3837)
    0.009972124 = product of:
      0.019944249 = sum of:
        0.019944249 = weight(_text_:22 in 3837) [ClassicSimilarity], result of:
          0.019944249 = score(doc=3837,freq=2.0), product of:
            0.085914485 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.02453417 = queryNorm
            0.23214069 = fieldWeight in 3837, 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=3837)
      0.5 = coord(1/2)
  0.2857143 = coord(4/14)

Abstract

Library of Congress Subject Headings (LSCH), which celebrated its 100th birthday in 1998, is the largest cataloging and indexing language in the world for the indication of the topics and formats of books and similar publications. It consists of a controlled list of main headings, many with subdivisions, with a rich system of cross references. It is supported by the U.S. government, and undergoes systematic revision. In recent decades its managers have begun to confront challenges such as biased terminology, complicated syntax (how terms are put together to form headings), and effective displays in electronic media. Many suggestions have been made for its improvement, including moving to a fully faceted system.

Date

27. 8.2011 14:22:13

Source

Encyclopedia of library and information sciences. 3rd ed. Ed.: M.J. Bates

Theme

Verbale Doksprachen im Online-Retrieval

0.01500045 = product of:
  0.0700021 = sum of:
    0.03293213 = weight(_text_:system in 2703) [ClassicSimilarity], result of:
      0.03293213 = score(doc=2703,freq=12.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.42618635 = fieldWeight in 2703, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2703)
    0.009339468 = weight(_text_:information in 2703) [ClassicSimilarity], result of:
      0.009339468 = score(doc=2703,freq=10.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.21684799 = fieldWeight in 2703, product of:
          3.1622777 = tf(freq=10.0), with freq of:
            10.0 = termFreq=10.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2703)
    0.027730504 = weight(_text_:retrieval in 2703) [ClassicSimilarity], result of:
      0.027730504 = score(doc=2703,freq=10.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.37365708 = fieldWeight in 2703, product of:
          3.1622777 = tf(freq=10.0), with freq of:
            10.0 = termFreq=10.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2703)
  0.21428572 = coord(3/14)

Abstract

When consumers search for health information, a major obstacle is their unfamiliarity with the medical terminology. Even though medical thesauri such as the Medical Subject Headings (MeSH) and related tools (e.g., the MeSH Browser) were created to help consumers find medical term definitions, the lack of direct and explicit integration of these help tools into a health retrieval system prevented them from effectively achieving their objectives. To explore this issue, we conducted an empirical study with two systems: One is a simple interface system supporting query-based searching; the other is an augmented system with two new components supporting MeSH term searching and MeSH tree browsing. A total of 45 subjects were recruited to participate in the study. The results indicated that the augmented system is more effective than the simple system in terms of improving user-perceived topic familiarity and question-answer performance, even though we did not find users spend more time on the augmented system. The two new MeSH help components played a critical role in participants' health information retrieval and were found to allow them to develop new search strategies. The findings of the study enhanced our understanding of consumers' search behaviors and shed light on the design of future health information retrieval systems.

Source

Information processing and management. 50(2014) no.1, S.24-40

Theme

Verbale Doksprachen im Online-Retrieval

0.012042345 = product of:
  0.056197606 = sum of:
    0.03567225 = weight(_text_:system in 3966) [ClassicSimilarity], result of:
      0.03567225 = score(doc=3966,freq=22.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.46164727 = fieldWeight in 3966, product of:
          4.690416 = tf(freq=22.0), with freq of:
            22.0 = termFreq=22.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.03125 = fieldNorm(doc=3966)
    0.0033413896 = weight(_text_:information in 3966) [ClassicSimilarity], result of:
      0.0033413896 = score(doc=3966,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.0775819 = fieldWeight in 3966, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.03125 = fieldNorm(doc=3966)
    0.017183965 = weight(_text_:retrieval in 3966) [ClassicSimilarity], result of:
      0.017183965 = score(doc=3966,freq=6.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.23154683 = fieldWeight in 3966, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.03125 = fieldNorm(doc=3966)
  0.21428572 = coord(3/14)

Abstract

Organizing and providing access to the resources an the Internet has been a problem area in spite of the availability of sophisticated search engines and other Software tools. There have been several attempts to organize the resources an the WWW. Some of them have tried to use traditional library classification schemes such as the Library of Congress Classification, the Dewey Decimal Classification and others. However there is a need to assign proper subject headings to them and present them in a logical or hierarchical sequence to cater to the need for browsing. This paper attempts to describe an experimental system designed to organize and provide access to web documents using a faceted pre-coordinate indexing system based an the Deep Structure Indexing System (DSIS) derived from POPSI (Postulate based Permuted Subject Indexing) of Bhattacharyya, and the facet analysis and chain indexing System of Ranganathan. A prototype software system has been designed to create a database of records specifying Web documents according to the Dublin Core and input a faceted subject heading according to DSIS. Synonymous terms are added to the standard terms in the heading using appropriate symbols. Once the data are entered along with a description and URL of the Web document, the record is stored in the system. More than one faceted subject heading can be assigned to a record depending an the content of the original document. The system stores the surrogates and keeps the faceted subject headings separately after establishing a link. Search is carried out an index entries derived from the faceted subject heading using chain indexing technique. If a single term is input, the system searches for its presence in the faceted subject headings and displays the subject headings in a sorted sequence reflecting an organizing sequence. If the number of retrieved headings is too large (running into more than a page) then the user has the option of entering another search term to be searched in combination. The system searches subject headings already retrieved and look for those containing the second term. The retrieved faceted subject headings can be displayed and browsed. When the relevant subject heading is selected the system displays the records with their URLs. Using the URL the original document an the web can be accessed. The prototype system developed under Windows NT environment using ASP and web server is under rigorous testing. The database and indexes management routines need further development.

Source

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. Ed.: I.C. McIlwaine

Theme

Klassifikationssysteme im Online-Retrieval
Verbale Doksprachen im Online-Retrieval

0.011069352 = product of:
  0.051656976 = sum of:
    0.015210699 = weight(_text_:system in 4549) [ClassicSimilarity], result of:
      0.015210699 = score(doc=4549,freq=4.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.19684705 = fieldWeight in 4549, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.03125 = fieldNorm(doc=4549)
    0.006682779 = weight(_text_:information in 4549) [ClassicSimilarity], result of:
      0.006682779 = score(doc=4549,freq=8.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.1551638 = fieldWeight in 4549, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.03125 = fieldNorm(doc=4549)
    0.0297635 = weight(_text_:retrieval in 4549) [ClassicSimilarity], result of:
      0.0297635 = score(doc=4549,freq=18.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.40105084 = fieldWeight in 4549, product of:
          4.2426405 = tf(freq=18.0), with freq of:
            18.0 = termFreq=18.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.03125 = fieldNorm(doc=4549)
  0.21428572 = coord(3/14)

Abstract

Purpose - This paper attempts to explain the wide dissemination of Library of Congress Subject Headings (LCSH) within digital libraries and presents some of the advantages and disadvantages of using this controlled vocabulary in digital collections. The paper also presents other classifications used in digital collections for subject access and explores ways of improving search functionality in digital collections that employ LCSH. Design/methodology/approach - Unlike traditional libraries that use Library of Congress Classification for organization and retrieval, digital libraries use metadata forms for organization and retrieval. The collections exist in cyberspace of the internet which is known for containing the universe of knowledge. The use of LCSH for information retrieval has been widely criticized for its difficulty of use and its information retrieval effectiveness in online environments. The Library of Congress (LOC) has claimed the headings were not based on comprehensive principles nor ever intended to cover the universe of knowledge. Despite these claims and criticisms, LCSH is the most popular choice for subject access in digital libraries. Findings - The number of digital collections increases every year and LCSH is still the most popular choice of controlled vocabulary for subject access. Of the numerous criticisms, difficulties of use and user unfamiliarity are the greatest disadvantages of using LCSH for subject access. Average users only have a vague notion of what they are looking for when initializing a search. More work is required in automated generation of subject headings and increased usage of LCSH in faceted search retrieval systems. This will provide users with better access to the LCSH used in the back end of information retrieval. Originality/value - The Greek researchers who developed the Dissertation DSPace system believe this type of module will eventually replace the traditional keyword-based indexing back ends employed by many information retrieval modules within current digital library systems. The system offers the type of access and interactivity that will acquaint users with how LCSH looks and is used. Faceted search and automated pattern matching using an ontology based on LCSH have the best promise of overcoming the disadvantages that have always plagued the LOC-controlled vocabulary. These retrieval techniques give LCSH an opportunity to finally achieve the optimal precision and recall it has so far failed to deliver.

Theme

Verbale Doksprachen im Online-Retrieval

0.010293491 = product of:
  0.048036292 = sum of:
    0.021511177 = weight(_text_:system in 3349) [ClassicSimilarity], result of:
      0.021511177 = score(doc=3349,freq=2.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.27838376 = fieldWeight in 3349, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0625 = fieldNorm(doc=3349)
    0.006682779 = weight(_text_:information in 3349) [ClassicSimilarity], result of:
      0.006682779 = score(doc=3349,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.1551638 = fieldWeight in 3349, 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=3349)
    0.019842334 = weight(_text_:retrieval in 3349) [ClassicSimilarity], result of:
      0.019842334 = score(doc=3349,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.26736724 = fieldWeight in 3349, 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=3349)
  0.21428572 = coord(3/14)

Abstract

Attempts to gauge whether syndetic structure, the cross reference system long regarded as an integral component of the controlled vocabulary which predominates as the indexing framework for online subject searching, still has a role to play in assisting end users in their information quests. To this end, examines a number of existing and proposed enhancements to OPACs by means of a literatur review. These include: Boolean and keyword searching; online browsing; artificial intelligence; classification clustering; and hypertext. Discusses Dervin's sensemaking theories and methodologies

Theme

Verbale Doksprachen im Online-Retrieval

0.010262678 = product of:
  0.071838744 = sum of:
    0.011694863 = weight(_text_:information in 3826) [ClassicSimilarity], result of:
      0.011694863 = score(doc=3826,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.27153665 = fieldWeight in 3826, 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=3826)
    0.06014388 = weight(_text_:retrieval in 3826) [ClassicSimilarity], result of:
      0.06014388 = score(doc=3826,freq=6.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.8104139 = fieldWeight in 3826, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.109375 = fieldNorm(doc=3826)
  0.14285715 = coord(2/14)

Source

Annual review of information science and technology. 35(2001), S.249-298

Theme

Klassifikationssysteme im Online-Retrieval
Verbale Doksprachen im Online-Retrieval

0.010246813 = product of:
  0.047818463 = sum of:
    0.018822279 = weight(_text_:system in 7238) [ClassicSimilarity], result of:
      0.018822279 = score(doc=7238,freq=2.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.2435858 = fieldWeight in 7238, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0546875 = fieldNorm(doc=7238)
    0.017362041 = weight(_text_:retrieval in 7238) [ClassicSimilarity], result of:
      0.017362041 = score(doc=7238,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.23394634 = fieldWeight in 7238, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=7238)
    0.011634145 = product of:
      0.02326829 = sum of:
        0.02326829 = weight(_text_:22 in 7238) [ClassicSimilarity], result of:
          0.02326829 = score(doc=7238,freq=2.0), product of:
            0.085914485 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.02453417 = queryNorm
            0.2708308 = fieldWeight in 7238, 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=7238)
      0.5 = coord(1/2)
  0.21428572 = coord(3/14)

Abstract

Subject access in library OPACs might be improved for some users by taking advantage of all of the hierarchical relationships which are indicated on existing LCSH entries. Recommends that cross references pointing to broader terms be displayed, in addition to those for narrower and related terms to which users have traditionally benn directed. Traces the old practice back to Charles Cutter, reports on deliberations of the ALCTS Subject Analysis Committee nearly 120 years later. Discusses practical concerns related to implementing the change, including the accuracy of hierarchical relationships in the LCSH system and possible techniques for using the MARC format to generate the cross references

Date

22. 4.1997 20:43:23

Theme

Verbale Doksprachen im Online-Retrieval

0.009485896 = product of:
  0.044267513 = sum of:
    0.016133383 = weight(_text_:system in 3431) [ClassicSimilarity], result of:
      0.016133383 = score(doc=3431,freq=2.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.20878783 = fieldWeight in 3431, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.046875 = fieldNorm(doc=3431)
    0.0070881573 = weight(_text_:information in 3431) [ClassicSimilarity], result of:
      0.0070881573 = score(doc=3431,freq=4.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.16457605 = fieldWeight in 3431, 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=3431)
    0.021045974 = weight(_text_:retrieval in 3431) [ClassicSimilarity], result of:
      0.021045974 = score(doc=3431,freq=4.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.2835858 = fieldWeight in 3431, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.046875 = fieldNorm(doc=3431)
  0.21428572 = coord(3/14)

Abstract

With the current information environment characterized by the proliferation of digital resources, including collaboratively created and shared resources, Library of Congress Subject Headings (LCSH) is facing the challenges of effective and efficient subject-based organization and retrieval of digital resources. To explore the feasibility of utilizing LCSH in a digital environment, we might need to revisit its basic characteristics. The objectives of our study were to analyze LCSH in both syntactic and relational structures, to discover the structural characteristics of LCSH, and to identify problems and issues for the feasibility of LCSH as an effective subject access tool. This study reports and discusses issues raised by the syntactic and hierarchical structures of LCSH that present challenges to its use in a networked environment. Given the results of this study, we recommend a number of provisional future directions for the development of LCSH towards further becoming a viable system for digital and networked resources.

Source

Journal of the American Society for Information Science and Technology. 61(2010) no.4, S.677-687

Theme

Verbale Doksprachen im Online-Retrieval

0.009314393 = product of:
  0.043467164 = sum of:
    0.02688897 = weight(_text_:system in 2918) [ClassicSimilarity], result of:
      0.02688897 = score(doc=2918,freq=8.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.3479797 = fieldWeight in 2918, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2918)
    0.004176737 = weight(_text_:information in 2918) [ClassicSimilarity], result of:
      0.004176737 = score(doc=2918,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.09697737 = fieldWeight in 2918, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2918)
    0.012401459 = weight(_text_:retrieval in 2918) [ClassicSimilarity], result of:
      0.012401459 = score(doc=2918,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.16710453 = fieldWeight in 2918, 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=2918)
  0.21428572 = coord(3/14)

Abstract

Reports an algorithmic approach to the automatic generation of thesauri for electronic community systems. The techniques used included terms filtering, automatic indexing, and cluster analysis. The testbed for the research was the Worm Community System, which contains a comprehensive library of specialized community data and literature, currently in use by molecular biologists who study the nematode worm. The resulting worm thesaurus included 2709 researchers' names, 798 gene names, 20 experimental methods, and 4302 subject descriptors. On average, each term had about 90 weighted neighbouring terms indicating relevant concepts. The thesaurus was developed as an online search aide. Tests the worm thesaurus in an experiment with 6 worm researchers of varying degrees of expertise and background. The experiment showed that the thesaurus was an excellent 'memory jogging' device and that it supported learning and serendipitous browsing. Despite some occurrences of obvious noise, the system was useful in suggesting relevant concepts for the researchers' queries and it helped improve concept recall. With a simple browsing interface, an automatic thesaurus can become a useful tool for online search and can assist researchers in exploring and traversing a dynamic and complex electronic community system

Source

Journal of the American Society for Information Science. 46(1995) no.3, S.175-193

Theme

Verbale Doksprachen im Online-Retrieval

0.008861467 = product of:
  0.062030267 = sum of:
    0.032266766 = weight(_text_:system in 454) [ClassicSimilarity], result of:
      0.032266766 = score(doc=454,freq=2.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.41757566 = fieldWeight in 454, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.09375 = fieldNorm(doc=454)
    0.029763501 = weight(_text_:retrieval in 454) [ClassicSimilarity], result of:
      0.029763501 = score(doc=454,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.40105087 = fieldWeight in 454, 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=454)
  0.14285715 = coord(2/14)

Theme

Preserved Context Index System (PRECIS)
Verbale Doksprachen im Online-Retrieval

0.008796581 = product of:
  0.061576065 = sum of:
    0.0100241685 = weight(_text_:information in 891) [ClassicSimilarity], result of:
      0.0100241685 = score(doc=891,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.23274569 = fieldWeight in 891, 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=891)
    0.051551897 = weight(_text_:retrieval in 891) [ClassicSimilarity], result of:
      0.051551897 = score(doc=891,freq=6.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.6946405 = fieldWeight in 891, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.09375 = fieldNorm(doc=891)
  0.14285715 = coord(2/14)

Theme

Klassifikationssysteme im Online-Retrieval
Verbale Doksprachen im Online-Retrieval

0.00798273 = product of:
  0.05587911 = sum of:
    0.021511177 = weight(_text_:system in 5169) [ClassicSimilarity], result of:
      0.021511177 = score(doc=5169,freq=2.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.27838376 = fieldWeight in 5169, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0625 = fieldNorm(doc=5169)
    0.03436793 = weight(_text_:retrieval in 5169) [ClassicSimilarity], result of:
      0.03436793 = score(doc=5169,freq=6.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.46309367 = fieldWeight in 5169, 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=5169)
  0.14285715 = coord(2/14)

Abstract

Open system protocols for search and retrieval have not provided explicit ways in which to implement thesaurus-aided searching. A number of different approaches within the existing protocols, as well as a proposed service, are evaluated. A general approach to implementing thesaurus-aided searching, particularly during consultation of a thesaurus, requires an entirely new service, whose main features are described

Theme

Verbale Doksprachen im Online-Retrieval

0.0074451594 = product of:
  0.052116115 = sum of:
    0.0100241685 = weight(_text_:information in 2098) [ClassicSimilarity], result of:
      0.0100241685 = score(doc=2098,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = 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)
    0.042091947 = weight(_text_:retrieval in 2098) [ClassicSimilarity], result of:
      0.042091947 = score(doc=2098,freq=4.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = 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

0.0074451594 = product of:
  0.052116115 = sum of:
    0.0100241685 = weight(_text_:information in 3807) [ClassicSimilarity], result of:
      0.0100241685 = score(doc=3807,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.23274569 = fieldWeight in 3807, 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=3807)
    0.042091947 = weight(_text_:retrieval in 3807) [ClassicSimilarity], result of:
      0.042091947 = score(doc=3807,freq=4.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.5671716 = fieldWeight in 3807, 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=3807)
  0.14285715 = coord(2/14)

Source

Journal of information science. 28(2002) no.2, S.111-122

Theme

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

0.0073304838 = product of:
  0.051313385 = sum of:
    0.008353474 = weight(_text_:information in 873) [ClassicSimilarity], result of:
      0.008353474 = score(doc=873,freq=2.0), product of:
        0.04306919 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.02453417 = queryNorm
        0.19395474 = fieldWeight in 873, 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=873)
    0.042959914 = weight(_text_:retrieval in 873) [ClassicSimilarity], result of:
      0.042959914 = score(doc=873,freq=6.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.5788671 = fieldWeight in 873, 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=873)
  0.14285715 = coord(2/14)

Theme

Klassifikationssysteme im Online-Retrieval
Verbale Doksprachen im Online-Retrieval

0.0071805334 = product of:
  0.050263733 = sum of:
    0.030421399 = weight(_text_:system in 1632) [ClassicSimilarity], result of:
      0.030421399 = score(doc=1632,freq=4.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.3936941 = fieldWeight in 1632, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0625 = fieldNorm(doc=1632)
    0.019842334 = weight(_text_:retrieval in 1632) [ClassicSimilarity], result of:
      0.019842334 = score(doc=1632,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.26736724 = fieldWeight in 1632, 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=1632)
  0.14285715 = coord(2/14)

Footnote

Enthält das Ergebnis einer Befragung. 0 hielten das System für sehr gut; 13 für gut; 11 für halbwegs gut; 7 für halbwegs gut; 11 für schlecht. 8,9% der Befragten würden das System übernehmen, 47,5% nicht, 43,6% vielleicht

Theme

Verbale Doksprachen im Online-Retrieval

0.007137598 = product of:
  0.049963184 = sum of:
    0.032601144 = weight(_text_:system in 1595) [ClassicSimilarity], result of:
      0.032601144 = score(doc=1595,freq=6.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.42190298 = fieldWeight in 1595, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.0546875 = fieldNorm(doc=1595)
    0.017362041 = weight(_text_:retrieval in 1595) [ClassicSimilarity], result of:
      0.017362041 = score(doc=1595,freq=2.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.23394634 = fieldWeight in 1595, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.0546875 = fieldNorm(doc=1595)
  0.14285715 = coord(2/14)

Abstract

A movement for a subject heading code to standardize LCSH and their usage gained considerable attention in the late 1980s and early 1990s. Examines the reasons for the lack of progress in this project, which include: the lack of any plan from the LoC which could serve as a philosophical foundation for either a subject access system or the changes made to it; the belief that online catalogues make a controlled subject vocabulary obsolete; and professional ignorance, apathy, and negativism. Warns that, in an increasingly complex age, lack of standardization of any technical system or process tends to lead to the demise of that system or process

Theme

Verbale Doksprachen im Online-Retrieval

0.0071316254 = product of:
  0.049921375 = sum of:
    0.037644558 = weight(_text_:system in 97) [ClassicSimilarity], result of:
      0.037644558 = score(doc=97,freq=32.0), product of:
        0.07727166 = queryWeight, product of:
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02453417 = queryNorm
        0.4871716 = fieldWeight in 97, product of:
          5.656854 = tf(freq=32.0), with freq of:
            32.0 = termFreq=32.0
          3.1495528 = idf(docFreq=5152, maxDocs=44218)
          0.02734375 = fieldNorm(doc=97)
    0.012276817 = weight(_text_:retrieval in 97) [ClassicSimilarity], result of:
      0.012276817 = score(doc=97,freq=4.0), product of:
        0.07421378 = queryWeight, product of:
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02453417 = queryNorm
        0.16542503 = fieldWeight in 97, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.024915 = idf(docFreq=5836, maxDocs=44218)
          0.02734375 = fieldNorm(doc=97)
  0.14285715 = coord(2/14)

Abstract

Organizing and providing access to the resources an the Internet has been a problem area in spite of the availability of sophisticated search engines and other Software tools. There have been several attempts to organize the resources an the World Wide Web. Some of them have tried to use traditional library classification schemes such as the Library of Congress Classification, the Dewey Decimal Classification and others. However there is a need to assign proper subject headings to them and present them in a logical or hierarchical sequence to cater to the need for browsing. This paper attempts to describe an experimental system designed to organize and provide access to web documents using a faceted pre-coordinate indexing system based an the Deep Structure Indexing System (DSIS) derived from POPSI (Postulate based Permuted Subject Indexing) of Bhattacharyya, and the facet analysis and chain indexing system of Ranganathan. A prototype Software System has been designed to create a database of records specifying Web documents according to the Dublin Core and to input a faceted subject heading according to DSIS. Synonymous terms are added to the Standard terms in the heading using appropriate symbols. Once the data are entered along with a description and the URL of the web document, the record is stored in the System. More than one faceted subject heading can be assigned to a record depending an the content of the original document. The System stores the Surrogates and keeps the faceted subject headings separately after establishing a link. The search is carried out an index entries derived from the faceted subject heading using the chain indexing technique. If a single term is Input, the System searches for its presence in the faceted subject headings and displays the subject headings in a sorted sequence reflecting an organizing sequence. If the number of retrieved Keadings is too large (running into more than a page) the user has the option of entering another search term to be searched in combination. The System searches subject headings already retrieved and looks for those containing the second term. The retrieved faceted subject headings can be displayed and browsed. When the relevant subject heading is selected the system displays the records with their URLs. Using the URL, the original document an the web can be accessed. The prototype system developed in a Windows NT environment using ASP and a web server is under rigorous testing. The database and Index management routines need further development.
An interesting but somewhat confusing article telling how the writers described web pages with Dublin Core metadata, including a faceted classification, and built a system that lets users browse the collection through the facets. They seem to want to cover too much in a short article, and unnecessary space is given over to screen shots showing how Dublin Core metadata was entered. The screen shots of the resulting browsable system are, unfortunately, not as enlightening as one would hope, and there is no discussion of how the system was actually written or the technology behind it. Still, it could be worth reading as an example of such a system and how it is treated in journals.

Theme

Klassifikationssysteme im Online-Retrieval
Verbale Doksprachen im Online-Retrieval