1,721,021 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Universal structure of subleading infrared poles at strong coupling
No full textRecently a concise expression for the subleading infrared singularity of dimensional-regularized gauge theories has been proposed. For conformal theories, such relation involves a universal eikonal contribution plus a non-eikonal contribution, related to the subleading term in the anomalous dimension of twist two operators with large spin. In this note we make use of the AdS/CFT correspondence in order to check such conjecture at strong coupling for the case of = 4 SYM. © SISSA 2009
Scattering amplitudes and the AdS/CFT correspondence
No full textWe give a pedagogical account of recent progress concerning the computation of scattering amplitudes of planar maximally supersymmetric Yang-Mills in four dimensions at strong coupling by means of the AdS/CFT correspondence. Two important ingredients of the computation are the presence of a 'dual' conformal symmetry and the equivalence between the scattering amplitude and a particular kind of light-like cusped Wilson loops. We discuss recent progress extending these two features to all values of the coupling constant. © 2009 IOP Publishing Ltd
Non-local charges on AdS5 × S5 and PP-waves
No full textWe show the existence of an infinite set of non-local classically conserved charges on the Green-Schwarz closed superstring in a pp-wave background. We find that these charges agree with the Penrose limit of non-local classically conserved charges recently found for the AdS5 × S5 Green-Schwarz superstring. The charges constructed in this paper could help to understand the role played by these on the full AdS5 × S 5 background. © SISSA/ISAS 2003
Gravitational F-terms through Konishi anomaly
No full textWe review in a pedagogical way the computation of gravitational corrections to the effective superpotential of N = 1 supersymmetric gauge theories coupled to supergravity, by using the method of the generalized Konishi anomaly. We focus on the first non-trivial gravitational corrections to U (N) gauge theories with a single adjoint chiral multiplet, and briefly comment on some generalizations
Integrability and the AdS/CFT correspondence
No full textThe best known example of duality between a string and a gauge theory is that between strings on AdS 5 × S 5 and N = 4 SYM. In this report we give a very brief description of the integrable structures appearing on both sides of the duality. © 2007 Elsevier B.V. All rights reserved
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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