Search (45 results, page 1 of 3)

0.07327799 = product of:
  0.18319497 = sum of:
    0.14840356 = weight(_text_:thesaurus in 56) [ClassicSimilarity], result of:
      0.14840356 = score(doc=56,freq=12.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.62530804 = fieldWeight in 56, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.0390625 = fieldNorm(doc=56)
    0.03479141 = weight(_text_:22 in 56) [ClassicSimilarity], result of:
      0.03479141 = score(doc=56,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.19345059 = fieldWeight in 56, 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=56)
  0.4 = coord(2/5)

Abstract

The study reported here investigated the query expansion behavior of end-users interacting with a thesaurus-enhanced search system on the Web. Two groups, namely academic staff and postgraduate students, were recruited into this study. Data were collected from 90 searches performed by 30 users using the OVID interface to the CAB abstracts database. Data-gathering techniques included questionnaires, screen capturing software, and interviews. The results presented here relate to issues of search-topic and search-term characteristics, number and types of expanded queries, usefulness of thesaurus terms, and behavioral differences between academic staff and postgraduate students in their interaction. The key conclusions drawn were that (a) academic staff chose more narrow and synonymous terms than did postgraduate students, who generally selected broader and related terms; (b) topic complexity affected users' interaction with the thesaurus in that complex topics required more query expansion and search term selection; (c) users' prior topic-search experience appeared to have a significant effect on their selection and evaluation of thesaurus terms; (d) in 50% of the searches where additional terms were suggested from the thesaurus, users stated that they had not been aware of the terms at the beginning of the search; this observation was particularly noticeable in the case of postgraduate students.

Date

22. 7.2006 16:32:43

0.0363513 = product of:
  0.1817565 = sum of:
    0.1817565 = weight(_text_:thesaurus in 4331) [ClassicSimilarity], result of:
      0.1817565 = score(doc=4331,freq=18.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.7658428 = fieldWeight in 4331, product of:
          4.2426405 = tf(freq=18.0), with freq of:
            18.0 = termFreq=18.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.0390625 = fieldNorm(doc=4331)
  0.2 = coord(1/5)

Abstract

Purpose - This paper seeks to report an investigation into the ways in which end-users perceive a thesaurus-enhanced search interface, in particular thesaurus and search interface usability. Design/methodology/approach - Thirty academic users, split between staff and postgraduate students, carrying out real search requests were observed during this study. Users were asked to comment on a range of thesaurus and interface characteristics including: ease of use, ease of learning, ease of browsing and navigation, problems and difficulties encountered while interacting with the system, and the effect of browsing on search term selection. Findings - The results suggest that interface usability is a factor affecting thesaurus browsing/navigation and other information-searching behaviours. Academic staff viewed the function of a thesaurus as being useful for narrowing down a search and providing alternative search terms, while postgraduates stressed the role of the thesaurus for broadening searches and providing new terms. Originality/value - The paper provides an insight into the ways in which end-users make use of and interact with a thesaurus-enhanced search interface. This area is new since previous research has particularly focused on how professional searchers and librarians make use of thesauri and thesaurus-enhanced search interfaces. The research reported here suggests that end-users with varying levels of domain knowledge are able to use thesauri that are integrated into search interfaces. It also provides design implications for search interface developers as well as information professionals who are involved in teaching online searching.

0.035616852 = product of:
  0.17808425 = sum of:
    0.17808425 = weight(_text_:thesaurus in 2658) [ClassicSimilarity], result of:
      0.17808425 = score(doc=2658,freq=12.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.7503696 = fieldWeight in 2658, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.046875 = fieldNorm(doc=2658)
  0.2 = coord(1/5)

Abstract

The use of thesaurus-enhanced search tools is an the increase. This paper provides an insight into end-users interaction with and perceptions of such tools. In particular the overlap between users' initial query formulation and thesaurus structures is investigated. This investigation involved the performance of genuine search tasks an the CAB Abstracts database by academic users in the domain of veterinary medicine. The perception of these users regarding the nature and usefulness of the terms suggested from the thesaurus during the search interaction is reported. The results indicated that around 80% of terms entered were matched either exactly or partially to thesaurus terms. Users found over 90% of the terms suggested to be close to their search topics and where terms were selected they indicated that around 50% were to support a 'narrowing down' activity. These findings have implications for the design of thesaurus-enhanced interfaces.

Theme

Konzeption und Anwendung des Prinzips Thesaurus

0.034272335 = product of:
  0.17136167 = sum of:
    0.17136167 = weight(_text_:thesaurus in 3546) [ClassicSimilarity], result of:
      0.17136167 = score(doc=3546,freq=16.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.7220435 = fieldWeight in 3546, product of:
          4.0 = tf(freq=16.0), with freq of:
            16.0 = termFreq=16.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.0390625 = fieldNorm(doc=3546)
  0.2 = coord(1/5)

Abstract

The aim of this study is to compare (1) the semantic structures in lay persons' questions addressed to ask-an-expert service in the fields of health, nutrition and social services, and (2) to which extent lay persons' vocabularies are covered by a general thesaurus and a specific thesaurus in each of these fields. As representation of information needs 50 questions were selected concerning both health and nutrition, and 163 concerning social services. The concepts and their expressions in the questions were identified, and their semantic relations were observed and classified into equivalence, hierarchical and associative relations. The semantic structure of questions varied somewhat between the fields observed. Lay persons' expressions were covered most extensively in health, and least extensively in social services. Specific thesaurus covered more extensively expressions in health (65%) than general thesaurus (42%), whereas in nutrition there was no difference (33% vs. 32%), and in social services general thesaurus (21%) covered expressions somewhat better compared to specific thesaurus (15%). In terms of matching both specific and general thesaurus would provide searchers with reasonable support in term selection for query construction in health, but with limited assistance in nutrition and social services.

0.023744568 = product of:
  0.11872284 = sum of:
    0.11872284 = weight(_text_:thesaurus in 2766) [ClassicSimilarity], result of:
      0.11872284 = score(doc=2766,freq=12.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.5002464 = fieldWeight in 2766, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.03125 = fieldNorm(doc=2766)
  0.2 = coord(1/5)

Abstract

Thesauri have been important information and knowledge organisation tools for more than three decades. The recent emergence and phenomenal growth of the World Wide Web has created new opportunities to introduce thesauri as information search and retrieval aids to end user communities. While the number of web-based and hypertextual thesauri continues to grow, few investigations have yet been carried out to evaluate how end-users, for whom all these efforts are ostensibly made, interact with and make use of thesauri for query building and expansion. The present paper reports a pilot study carried out to determine the extent to which a thesaurus-enhanced search interface to a web-based database aided end-users in their selection of search terms. The study also investigated the ways in which users interacted with the thesaurus structure, terms, and interface. Thesaurusbased searching and browsing behaviours adopted by users while interacting with the thesaurus-enhanced search interface were also examined. 1. Introduction The last decade has witnessed the emergence of a broad range of applications for knowledge structures in general and thesauri in particular. A number of researchers have predicted that thesauri will increasingly be used in retrieval rather than for indexing (Milstead, 1998; Aitchison et al., 1997) and that their application in information retrieval systems will become more diverse due to the growth of fulltext databases accessed over the Internet (Williamson, 2000). Some researchers have emphasised the need for tailoring the structure and content of thesauri as tools for end-user searching (Bates, 1986; Strong and Drott, 1986; Anderson and Rowley, 1991; Lopez-Huertas, 1997) while others have suggested thesaurus-enhanced user interfaces to support query formulation and expansion (Pollitt et.al., 1994; Jones et.al., 1995; Beaulieu, 1997). The recent phenomenal growth of the World Wide Web has created new opportunities to introduce thesauri as information search and retrieval aids to end user communities. While the number of web-based and hypertextual thesauri continues to grow, few investigations have been carried out to evaluate the ways in which end-users interact with and make use of online thesauri for query building and expansion. The work reported here expands an a pilot study (Shiri and Revie, 2001) carried out to investigate user - thesaurus interaction in the domains of biology and veterinary medicine.

Theme

Konzeption und Anwendung des Prinzips Thesaurus

0.01948319 = product of:
  0.09741595 = sum of:
    0.09741595 = weight(_text_:22 in 7585) [ClassicSimilarity], result of:
      0.09741595 = score(doc=7585,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.5416616 = fieldWeight in 7585, 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=7585)
  0.2 = coord(1/5)

Date

22. 1.2000 17:52:11

0.01948319 = product of:
  0.09741595 = sum of:
    0.09741595 = weight(_text_:22 in 3924) [ClassicSimilarity], result of:
      0.09741595 = score(doc=3924,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.5416616 = fieldWeight in 3924, 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=3924)
  0.2 = coord(1/5)

Source

Library and information science research. 22(2000) no.4, S.371-382

0.019387359 = product of:
  0.09693679 = sum of:
    0.09693679 = weight(_text_:thesaurus in 3344) [ClassicSimilarity], result of:
      0.09693679 = score(doc=3344,freq=2.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.40844947 = fieldWeight in 3344, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.0625 = fieldNorm(doc=3344)
  0.2 = coord(1/5)

Abstract

Provides a background to the size, organisation, and activities of the University of Twente and its library, the only campus university in the Netherlands. Describes the development and integration of descriptors and their conversion into a thesaurus. Discusses national developments in subject cataloguing; the OPAC of Twente University Library; the changing role of the OPAC and of classification systems; international OPAC developments and evaluation of the Twente OPAC

0.019387359 = product of:
  0.09693679 = sum of:
    0.09693679 = weight(_text_:thesaurus in 5225) [ClassicSimilarity], result of:
      0.09693679 = score(doc=5225,freq=2.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.40844947 = fieldWeight in 5225, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.0625 = fieldNorm(doc=5225)
  0.2 = coord(1/5)

Abstract

Describes 3 experiments undertaken to research how machine factors influence the cognitive abilities of users. The experiments dealt with presentation programs of retrieval results and user selectivity, thesaurus construction and accuracy of the subject words ascertained by the user, and menu layout and time taken by the user. Discusses findings and the satisfaction of users with present databases

0.016699877 = product of:
  0.08349938 = sum of:
    0.08349938 = weight(_text_:22 in 2973) [ClassicSimilarity], result of:
      0.08349938 = score(doc=2973,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.46428138 = fieldWeight in 2973, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.09375 = fieldNorm(doc=2973)
  0.2 = coord(1/5)

Date

9. 2.2008 17:52:22

0.014540519 = product of:
  0.072702594 = sum of:
    0.072702594 = weight(_text_:thesaurus in 2263) [ClassicSimilarity], result of:
      0.072702594 = score(doc=2263,freq=2.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.30633712 = fieldWeight in 2263, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.046875 = fieldNorm(doc=2263)
  0.2 = coord(1/5)

Theme

Konzeption und Anwendung des Prinzips Thesaurus

0.013708933 = product of:
  0.06854466 = sum of:
    0.06854466 = weight(_text_:thesaurus in 625) [ClassicSimilarity], result of:
      0.06854466 = score(doc=625,freq=4.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.2888174 = fieldWeight in 625, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.03125 = fieldNorm(doc=625)
  0.2 = coord(1/5)

Abstract

The article reports a field study which examined the mental models of 80 undergraduates seeking information for either a history or psychology course essay when they were in an early, exploration stage of researching their essay. This group is presently at a disadvantage when using thesaurus-type schemes in indexes and online search engines because there is a disconnect between how domain novice users of IR systems represent a topic space and how this space is represented in the standard IR system thesaurus. The study attempted to (a) ascertain the coding language used by the 80 undergraduates in the study to mentally represent their topic and then (b) align the mental models with the hierarchical structure found in many thesauri. The intervention focused the undergraduates' thinking about their topic from a topic statement to a thesis statement. The undergraduates were asked to produce three mental model diagrams for their real-life course essay at the beginning, middle, and end of the interview, for a total of 240 mental model diagrams, from which we created a 12-category mental model classification scheme. Findings indicate that at the end of the intervention, (a) the percentage of vertical mental models increased from 24 to 35% of all mental models; but that (b) 3rd-year students had fewer vertical mental models than did 1st-year undergraduates in the study, which is counterintuitive. The results indicate that there is justification for pursuing our research based on the hypothesis that rotating a domain novice's mental model into a vertical position would make it easier for him or her to cognitively connect with the thesaurus's hierarchical representation of the topic area.

0.012117098 = product of:
  0.06058549 = sum of:
    0.06058549 = weight(_text_:thesaurus in 2707) [ClassicSimilarity], result of:
      0.06058549 = score(doc=2707,freq=2.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.2552809 = fieldWeight in 2707, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2707)
  0.2 = coord(1/5)

Abstract

The Getty art history information program carried out a two-year project to study how humanities scholars operate as end users of online databases. Visiting scholars at the Getty Center for the History of Art and the Humanities in Santa Monica, California, were offered the opportunity to so unlimited subsidized searching of DIALOG databases. This first report from the project analyzes the vocabulary terms twenty-two scholars used in their natural language descriptions of their information needs and in their online searches. The data were extracted from 165 natural language statements and 1.068 search terms. Vocabulary categories used by humanities scholars were found to differ markedly from those used in the sciences, a fact that imposes distinctive demands on thesaurus development and the design of online information systems. Humanities scholars searched for far more named individuals, geographical terms, chronological terms, and discipline terms than was the case in a comparative science sample. The analysis provides substantial support for the growing perception that information needs of humanities scholars are distinct from those of scholars in other fields, and that the design of information-providing systems for these scholars must take their unique qualitites into account

0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 1628) [ClassicSimilarity], result of:
      0.055666253 = score(doc=1628,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 1628, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=1628)
  0.2 = coord(1/5)

Date

29. 7.1998 10:57:22

0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 3687) [ClassicSimilarity], result of:
      0.055666253 = score(doc=3687,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 3687, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=3687)
  0.2 = coord(1/5)

Date

22. 5.1999 19:07:29

0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 5299) [ClassicSimilarity], result of:
      0.055666253 = score(doc=5299,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 5299, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=5299)
  0.2 = coord(1/5)

Date

22. 7.2006 18:17:44

0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 2905) [ClassicSimilarity], result of:
      0.055666253 = score(doc=2905,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 2905, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=2905)
  0.2 = coord(1/5)

Date

22. 2.2009 18:50:43

0.009741595 = product of:
  0.048707973 = sum of:
    0.048707973 = weight(_text_:22 in 760) [ClassicSimilarity], result of:
      0.048707973 = score(doc=760,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.2708308 = fieldWeight in 760, 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=760)
  0.2 = coord(1/5)

Abstract

The degree of variability in the percentage of subject searching in an online public access catalog (OPAC) among branch libraries of one university was studied. A full semester's worth of transactions was analyzed, not sampled. The time units used were hour of the day, day of the week, and week of the semester. The findings show that subject searching varies from a low of 22% to a high of 74% over the hours of a day. Variability for the days of the week ranged from 17% to 64%, and for the weeks of the semester variability ranged from 12% to 70%. Valuable management information on the utilization of the OPAC within each brach library and among all the branch libraries is provided through numerous charts and graphs.

0.009741595 = product of:
  0.048707973 = sum of:
    0.048707973 = weight(_text_:22 in 7914) [ClassicSimilarity], result of:
      0.048707973 = score(doc=7914,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.2708308 = fieldWeight in 7914, 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=7914)
  0.2 = coord(1/5)

Source

International cataloguing and bibliographic control. 22(1993) no.4, S.68-71

0.009741595 = product of:
  0.048707973 = sum of:
    0.048707973 = weight(_text_:22 in 1795) [ClassicSimilarity], result of:
      0.048707973 = score(doc=1795,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.2708308 = fieldWeight in 1795, 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=1795)
  0.2 = coord(1/5)

Source

Canadian journal of information and library science. 19(1994) no.4, S.1-22