Literatur zur Informationserschließung
Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.
© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft
/
Powered by litecat, BIS Oldenburg
(Stand: 18. September 2018)
Suche
Suchergebnisse
Treffer 1–9 von 9
sortiert nach:

1Ye, F.Y. ; Bornmann, L.: "Smart girls" versus "sleeping beauties" in the sciences : the identification of instant and delayed recognition by using the citation angle.
In: Journal of the Association for Information Science and Technology. 69(2018) no.3, S.359367.
Abstract: In recent years, a number of studies have introduced methods for identifying papers with delayed recognition (so called "sleeping beauties," SBs) or have presented single publications as cases of SBs. Most recently, Ke, Ferrara, Radicchi, and Flammini (2015, Proceedings of the National Academy of Sciences of the USA, 112(24), 74267431) proposed the so called "beauty coefficient" (denoted as B) to quantify how much a given paper can be considered as a paper with delayed recognition. In this study, the new term smart girl (SG) is suggested to differentiate instant credit or "flashes in the pan" from SBs. Although SG and SB are qualitatively defined, the dynamic citation angle ß is introduced in this study as a simple way for identifying SGs and SBs quantitatively  complementing the beauty coefficient B. The citation angles for all articles from 1980 (n?=?166,870) in natural sciences are calculated for identifying SGs and SBs and their extent. We reveal that about 3% of the articles are typical SGs and about 0.1% typical SBs. The potential advantages of the citation angle approach are explained.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23846/full.
Themenfeld: Informetrie

2Ye, F.Y. ; Leydesdorff, L.: ¬The "academic trace" of the performance matrix : a mathematical synthesis of the hindex and the integrated impact indicator (I3).
In: Journal of the Association for Information Science and Technology. 65(2014) no.4, S.742750.
Abstract: The hindex provides us with 9 natural classes which can be written as a matrix of 3 vectors. The 3 vectors are: X = (X1, X2, X3) and indicates publication distribution in the hcore, the htail, and the uncited ones, respectively; Y = (Y1, Y2, Y3) denotes the citation distribution of the hcore, the htail and the socalled "excess" citations (above the hthreshold), respectively; and Z = (Z1, Z2, Z3) = (Y1X1, Y2X2, Y3X3). The matrix V = (X,Y,Z)T constructs a measure of academic performance, in which the 9 numbers can all be provided with meanings in different dimensions. The "academic trace" tr(V) of this matrix follows naturally, and contributes a unique indicator for total academic achievements by summarizing and weighting the accumulation of publications and citations. This measure can also be used to combine the advantages of the hindex and the integrated impact indicator (I3) into a single number with a meaningful interpretation of the values. We illustrate the use of tr(V) for the cases of 2 journal sets, 2 universities, and ourselves as 2 individual authors.
Themenfeld: Informetrie
Objekt: hindex ; Integrated impact indicator (I3)

3Zhao, S.X. ; Zhang, P.L. ; Li, J. ; Tan, A.M. ; Ye, F.Y.: Abstracting the core subnet of weighted networks based on link strengths.
In: Journal of the Association for Information Science and Technology. 65(2014) no.5, S.984994.
Abstract: Most measures of networks are based on the nodes, although links are also elementary units in networks and represent interesting social or physical connections. In this work we suggest an option for exploring networks, called the hstrength, with explicit focus on links and their strengths. The hstrength and its extensions can naturally simplify a complex network to a small and concise subnetwork (hsubnet) but retains the most important links with its core structure. Its applications in 2 typical information networks, the paper cocitation network of a topic (the hindex) and 5 scientific collaboration networks in the field of "water resources," suggest that hstrength and its extensions could be a useful choice for abstracting, simplifying, and visualizing a complex network. Moreover, we observe that the 2 informetric models, the GlänzelSchubert model and the Hirsch model, roughly hold in the context of the hstrength for the collaboration networks.
Themenfeld: Informetrie

4Zhao, S.X. ; Ye, F.Y.: Powerlaw link strength distribution in paper cocitation networks.
In: Journal of the American Society for Information Science and Technology. 64(2013) no.7, S.14801489.
Abstract: A network is constructed by nodes and links, thus the node degree and the link strength appear as underlying quantities in network analysis. While the powerlaw distribution of node degrees is verified as a basic feature of numerous real networks, we investigate whether the link strengths follow the powerlaw distribution in weighted networks. After testing 12 different paper cocitation networks with 2 methods, fitting in doublelog scales and the KolmogorovSmirnov test (KS test), we observe that, in most cases, the link strengths also follow the approximate powerlaw distribution. The results suggest that the powerlaw type distribution could emerge not only in nodes and informational entities, but also in links and informational connections.

5Ye, F.Y. ; Yu, S.S. ; Leydesdorff, L.: ¬The Triple Helix of universityindustrygovernment relations at the country level and its dynamic evolution under the pressures of globalization.
In: Journal of the American Society for Information Science and Technology. 64(2013) no.11, S.23172325.
Abstract: Using data from the Web of Science (WoS), we analyze the mutual information among university, industry, and government addresses (UIG) at the country level for a number of countries. The dynamic evolution of the Triple Helix can thus be compared among developed and developing nations in terms of crosssectional coauthorship relations. The results show that the Triple Helix interactions among the three subsystems UIG become less intensive over time, but unequally for different countries. We suggest that globalization erodes local Triple Helix relations and thus can be expected to have increased differentiation in national systems since the mid1990s. This effect of globalization is more pronounced in developed countries than in developing ones. In the dynamic analysis, we focus on a more detailed comparison between China and the United States. Specifically, the Chinese Academy of the (Social) Sciences is changing increasingly from a public research institute to an academic one, and this has a measurable effect on China's position in the globalization.
Themenfeld: Informetrie

6Zhao, S.X. ; Tan, A.M. ; Ye, F.Y.: Distributive hindices for measuring multilevel impact.
In: Journal of the American Society for Information Science and Technology. 63(2012) no.10, S.20742086.
Abstract: For measuring multilevel impact, we introduce the distributive hindices, which balance two important components (breadth and strength) of multilevel impact at various citing levels. After exploring the theoretical properties of these indices, we studied two cases: 57 library and information science (LIS) journals and social science research in 38 European countries/territories. Results reveal that there are approximate powerlaw relations between distributive hindices and some underlying citation indicators, such as total citations, total citing entities, and the hindex. Distributive hindices provide comprehensive measures for multilevel impact, and lead to a potential tool for citation analysis, particularly at aggregative levels.
Themenfeld: Informetrie
Objekt: hindex

7Ye, F.Y.: ¬A unification of three models for the hindex.
In: Journal of the American Society for Information Science and Technology. 62(2011) no.1, S.205207.
(Brief communication)
Abstract: Among existing theoretical models for the hindex, Hirsch's original approach, the EggheRousseau model, and the GlänzelSchubert model are the three main representatives. Assuming a powerlaw relation or Heaps' law between publications and citations a unified theoretical explanation for these three models is provided. It is shown that on the level of universities, the GlänzelSchubert model fits best.
Themenfeld: Informetrie
Objekt: hindex

8Ye, F.Y.: ¬A theoretical approach to the unification of informetric models by waveheat equations.
In: Journal of the American Society for Information Science and Technology. 62(2011) no.6, S.12081211.
(Brief communication)
Abstract: A simple distribution function f(x, t)=p(x+q)**ße**alpha*t obeys wave and heat equations, that constructs a theoretical approach to the unification of informetric models, with which we can unify all informetric laws. While its spacetype distributions deduce naturally Lotkatype laws in size approaches and Zipftype laws in rank approaches, its timetype distributions introduce the mechanism of Pricetype and Brookestype laws.
Themenfeld: Informetrie

9Rousseau, R. ; Ye, F.Y.: ¬A proposal for a dynamic htype index.
In: Journal of the American Society for Information Science and Technology. 59(2008) no.11, S.18531855.
(Brief Communications)
Abstract: A timedependent htype indicator is proposed. This indicator depends on the size of the hcore, the number of citations received, and recent change in the value of the hindex. As such, it tries to combine in a dynamic way older information about the source (e.g., a scientist or research institute that is evaluated) with recent information.
Themenfeld: Informetrie
Objekt: hindex