227,746 research outputs found
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
On SU(3) Monopoles in the Yang R-Gauge
No full textThe self-duality equations for the static SU(3) Yang-Mills-Higgs system in the R-gauge has been reduced to a set of coupled ordinary differential equations, by means of a one function Ansatz. The SU(2) embedding solutions are recovered
Noncommutative String Theory, the R-Matrix, and Hopf Algebras
No full textMotivated by the form of the noncommutative *-product in a system of open strings and Dp-branes with constant nonzero Neveu-Schwarz 2-form, we define a deformed multiplication operation on a quasitriangular Hopf algebra in terms of its R-matrix, and comment on some of its properties. We show that the noncommutative string theory *-product is a particular example of this multiplication, and comment on other possible Hopf algebraic properties which may underlie the theory
On the heat equation and the spectrum of the Dirichlet Laplacian for spiral regions in R^2
No full textWe determine the asymptotic behaviour of trace (e^(tΔ_S)) as t ↓ 0 where Δ_S is the Dirichlet Laplacian for a class of spiral regions in R^2
On the Parametrization of Clapping
No full textvan Welbergen H, Ruttkay Z. On the Parametrization of Clapping. In: Sales Dias M, Gibet S, Wanderley MM, Bastos R, eds. Gesture-Based Human-Computer Interaction and Simulation. Lecture Notes in Computer Science. Vol 5085. Berlin, Heidelberg: Springer Berlin Heidelberg; 2009: 36-47
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
R. W. M. Dias et B. S. Markesinis, Tort law
No full textR. W. M. Dias et B. S. Markesinis, Tort law. In: Revue internationale de droit comparé. Vol. 37 N°1, Janvier-mars 1985. p. 246
R. W. M. Dias et B. S. Markesinis, Tort law
No full textR. W. M. Dias et B. S. Markesinis, Tort law. In: Revue internationale de droit comparé. Vol. 37 N°1, Janvier-mars 1985. p. 246
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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