-
Leydesdorff, L.: How are new citation-based journal indicators adding to the bibliometric toolbox? (2009)
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- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.7, S.1327-1336
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Leydesdorff, L.; Probst, C.: ¬The delineation of an interdisciplinary specialty in terms of a journal set : the case of communication studies (2009)
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- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.8, S.1709-1718
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Leydesdorff, L.; Heimeriks, G.: ¬The self-organization of the European information society : the case of "biotechnology" (2001)
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- Source
- Journal of the American Society for Information Science and technology. 52(2001) no.14, S.1262-1274
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Leydesdorff, L.: Visualization of the citation impact environments of scientific journals : an online mapping exercise (2007)
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- Abstract
- Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5,968 journals) and the Social Science Citation Index (1,712 journals) are made accessible from the perspective of any of these journals. A vector-space model Is used for normalization, and the results are brought online at http://www.leydesdorff.net/jcr04 as input files for the visualization program Pajek. The user is thus able to analyze the citation environment in terms of links and graphs. Furthermore, the local impact of a journal is defined as its share of the total citations in the specific journal's citation environments; the vertical size of the nodes is varied proportionally to this citation impact. The horizontal size of each node can be used to provide the same information after correction for within-journal (self-)citations. In the "citing" environment, the equivalents of this measure can be considered as a citation activity index which maps how the relevant journal environment is perceived by the collective of authors of a given journal. As a policy application, the mechanism of Interdisciplinary developments among the sciences is elaborated for the case of nanotechnology journals.
- Source
- Journal of the American Society for Information Science and Technology. 58(2007) no.1, S.25-38
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Lucio-Arias, D.; Leydesdorff, L.: ¬An indicator of research front activity : measuring intellectual organization as uncertainty reduction in document sets (2009)
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- Abstract
- When using scientific literature to model scholarly discourse, a research specialty can be operationalized as an evolving set of related documents. Each publication can be expected to contribute to the further development of the specialty at the research front. The specific combinations of title words and cited references in a paper can then be considered as a signature of the knowledge claim in the paper: New words and combinations of words can be expected to represent variation, while each paper is at the same time selectively positioned into the intellectual organization of a field using context-relevant references. Can the mutual information among these three dimensions - title words, cited references, and sequence numbers - be used as an indicator of the extent to which intellectual organization structures the uncertainty prevailing at a research front? The effect of the discovery of nanotubes (1991) on the previously existing field of fullerenes is used as a test case. Thereafter, this method is applied to science studies with a focus on scientometrics using various sample delineations. An emerging research front about citation analysis can be indicated.
- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.12, S.2488-2498
-
Leydesdorff, L.; Rafols, I.: ¬A global map of science based on the ISI subject categories (2009)
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- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.2, S.348-362
-
Rafols, I.; Leydesdorff, L.: Content-based and algorithmic classifications of journals : perspectives on the dynamics of scientific communication and indexer effects (2009)
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- Source
- Journal of the American Society for Information Science and Technology. 60(2009) no.9, S.1823-1835
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Leydesdorff, L.: Can networks of journal-journal citations be used as indicators of change in the social sciences? (2003)
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- Date
- 6.11.2005 19:02:22
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Leydesdorff, L.: ¬A sociological theory of communication : the self-organization of the knowledge-based society (2001)
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- Theme
- Information
