Search (9 results, page 1 of 1)

  • × author_ss:"Leydesdorff, L."
  1. Hellsten, I.; Leydesdorff, L.: ¬The construction of interdisciplinarity : the development of the knowledge base and programmatic focus of the journal Climatic Change, 1977-2013 (2016) 0.01
    0.012539725 = product of:
      0.05642876 = sum of:
        0.045931276 = product of:
          0.09186255 = sum of:
            0.09186255 = weight(_text_:1977 in 3089) [ClassicSimilarity], result of:
              0.09186255 = score(doc=3089,freq=4.0), product of:
                0.19089708 = queryWeight, product of:
                  6.159553 = idf(docFreq=253, maxDocs=44218)
                  0.030992035 = queryNorm
                0.4812151 = fieldWeight in 3089, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  6.159553 = idf(docFreq=253, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=3089)
          0.5 = coord(1/2)
        0.0104974825 = product of:
          0.020994965 = sum of:
            0.020994965 = weight(_text_:22 in 3089) [ClassicSimilarity], result of:
              0.020994965 = score(doc=3089,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.19345059 = fieldWeight in 3089, 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=3089)
          0.5 = coord(1/2)
      0.22222222 = coord(2/9)
    
    Abstract
    Climate change as a complex physical and social issue has gained increasing attention in the natural as well as the social sciences. Climate change research has become more interdisciplinary and even transdisciplinary as a typical Mode-2 science that is also dependent on an application context for its further development. We propose to approach interdisciplinarity as a co-construction of the knowledge base in the reference patterns and the programmatic focus in the editorials in the core journal of the climate-change sciences-Climatic Change-during the period 1977-2013. First, we analyze the knowledge base of the journal and map journal-journal relations on the basis of the references in the articles. Second, we follow the development of the programmatic focus by analyzing the semantics in the editorials. We argue that interdisciplinarity is a result of the co-construction between different agendas: The selection of publications into the knowledge base of the journal, and the adjustment of the programmatic focus to the political context in the editorials. Our results show a widening of the knowledge base from referencing the multidisciplinary journals Nature and Science to citing journals from specialist fields. The programmatic focus follows policy-oriented issues and incorporates public metaphors.
    Date
    24. 8.2016 17:53:22
  2. Leydesdorff, L.; Ahrweiler, P.: In search of a network theory of innovations : relations, positions, and perspectives (2014) 0.00
    0.0036087015 = product of:
      0.032478314 = sum of:
        0.032478314 = product of:
          0.06495663 = sum of:
            0.06495663 = weight(_text_:1977 in 1531) [ClassicSimilarity], result of:
              0.06495663 = score(doc=1531,freq=2.0), product of:
                0.19089708 = queryWeight, product of:
                  6.159553 = idf(docFreq=253, maxDocs=44218)
                  0.030992035 = queryNorm
                0.34027043 = fieldWeight in 1531, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  6.159553 = idf(docFreq=253, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=1531)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Abstract
    As a complement to Nelson and Winter's (1977) article titled "In Search of a Useful Theory of Innovation," a sociological perspective on innovation networks can be elaborated using Luhmann's social systems theory, on the one hand, and Latour's "sociology of translations," on the other. Because of a common focus on communication, these perspectives can be combined as a set of methodologies. Latour's sociology of translations specifies a mechanism for generating variation in relations ("associations"), whereas Luhmann's systems perspective enables the specification of (functionally different) selection environments such as markets, professional organizations, and political control. Selection environments can be considered as mechanisms of social coordination that can self-organize-beyond the control of human agency-into regimes in terms of interacting codes of communication. Unlike relatively globalized regimes, technological trajectories are organized locally in "landscapes." A resulting "duality of structure" (Giddens, 1979) between the historical organization of trajectories and evolutionary self-organization at the regime level can be expected to drive innovation cycles. Reflexive translations add a third layer of perspectives to (a) the relational analysis of observable links that shape trajectories and (b) the positional analysis of networks in terms of latent dimensions. These three operations can be studied in a single framework, but using different methodologies. Latour's first-order associations can then be analytically distinguished from second-order translations in terms of requiring other communicative competencies. The resulting operations remain infrareflexively nested, and can therefore be used for innovative reconstructions of previously constructed boundaries.
  3. Leydesdorff, L.; Opthof, T.: Citation analysis with medical subject Headings (MeSH) using the Web of Knowledge : a new routine (2013) 0.00
    0.0020109804 = product of:
      0.018098824 = sum of:
        0.018098824 = product of:
          0.036197647 = sum of:
            0.036197647 = weight(_text_:1992 in 943) [ClassicSimilarity], result of:
              0.036197647 = score(doc=943,freq=2.0), product of:
                0.13008796 = queryWeight, product of:
                  4.197464 = idf(docFreq=1806, maxDocs=44218)
                  0.030992035 = queryNorm
                0.27825516 = fieldWeight in 943, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  4.197464 = idf(docFreq=1806, maxDocs=44218)
                  0.046875 = fieldNorm(doc=943)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Abstract
    Citation analysis of documents retrieved from the Medline database (at the Web of Knowledge) has been possible only on a case-by-case basis. A technique is presented here for citation analysis in batch mode using both Medical Subject Headings (MeSH) at the Web of Knowledge and the Science Citation Index at the Web of Science (WoS). This freeware routine is applied to the case of "Brugada Syndrome," a specific disease and field of research (since 1992). The journals containing these publications, for example, are attributed to WoS categories other than "cardiac and cardiovascular systems", perhaps because of the possibility of genetic testing for this syndrome in the clinic. With this routine, all the instruments available for citation analysis can now be used on the basis of MeSH terms. Other options for crossing between Medline, WoS, and Scopus are also reviewed.
  4. Leydesdorff, L.: ¬The construction and globalization of the knowledge base in inter-human communication systems (2003) 0.00
    0.0013996642 = product of:
      0.012596978 = sum of:
        0.012596978 = product of:
          0.025193956 = sum of:
            0.025193956 = weight(_text_:22 in 1621) [ClassicSimilarity], result of:
              0.025193956 = score(doc=1621,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.23214069 = fieldWeight in 1621, 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=1621)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Date
    22. 5.2003 19:48:04
  5. Leydesdorff, L.: Can networks of journal-journal citations be used as indicators of change in the social sciences? (2003) 0.00
    0.0013996642 = product of:
      0.012596978 = sum of:
        0.012596978 = product of:
          0.025193956 = sum of:
            0.025193956 = weight(_text_:22 in 4460) [ClassicSimilarity], result of:
              0.025193956 = score(doc=4460,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.23214069 = fieldWeight in 4460, 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=4460)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Date
    6.11.2005 19:02:22
  6. Leydesdorff, L.; Sun, Y.: National and international dimensions of the Triple Helix in Japan : university-industry-government versus international coauthorship relations (2009) 0.00
    0.0013996642 = product of:
      0.012596978 = sum of:
        0.012596978 = product of:
          0.025193956 = sum of:
            0.025193956 = weight(_text_:22 in 2761) [ClassicSimilarity], result of:
              0.025193956 = score(doc=2761,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.23214069 = fieldWeight in 2761, 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=2761)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Date
    22. 3.2009 19:07:20
  7. Leydesdorff, L.; Bornmann, L.; Wagner, C.S.: ¬The relative influences of government funding and international collaboration on citation impact (2019) 0.00
    0.0013996642 = product of:
      0.012596978 = sum of:
        0.012596978 = product of:
          0.025193956 = sum of:
            0.025193956 = weight(_text_:22 in 4681) [ClassicSimilarity], result of:
              0.025193956 = score(doc=4681,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.23214069 = fieldWeight in 4681, 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=4681)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Date
    8. 1.2019 18:22:45
  8. Leydesdorff, L.; Bornmann, L.: How fractional counting of citations affects the impact factor : normalization in terms of differences in citation potentials among fields of science (2011) 0.00
    0.001166387 = product of:
      0.0104974825 = sum of:
        0.0104974825 = product of:
          0.020994965 = sum of:
            0.020994965 = weight(_text_:22 in 4186) [ClassicSimilarity], result of:
              0.020994965 = score(doc=4186,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.19345059 = fieldWeight in 4186, 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=4186)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Date
    22. 1.2011 12:51:07
  9. Leydesdorff, L.; Johnson, M.W.; Ivanova, I.: Toward a calculus of redundancy : signification, codification, and anticipation in cultural evolution (2018) 0.00
    0.001166387 = product of:
      0.0104974825 = sum of:
        0.0104974825 = product of:
          0.020994965 = sum of:
            0.020994965 = weight(_text_:22 in 4463) [ClassicSimilarity], result of:
              0.020994965 = score(doc=4463,freq=2.0), product of:
                0.10852882 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.030992035 = queryNorm
                0.19345059 = fieldWeight in 4463, 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=4463)
          0.5 = coord(1/2)
      0.11111111 = coord(1/9)
    
    Date
    29. 9.2018 11:22:09