1,720,966 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
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
Un modèle d'Ising de criticité auto-organisée en dimension 2
No full textInternational audienceWe consider the planar Ising model in a finite square box and we replace the temperature parameter with a function depending on the magnetization. This creates a feedback from the spin configuration onto the parameter, which drives the system towards the critical point. Using the finite-size scaling results of Cerf and Messikh (Probab Theory Relat Fields 150(1–2):193–217, 2011), we show that, when the size of the box grows to infinity, the temperature concentrates around the critical temperature of the planar Ising model on the square lattice.Nous considérons le modèle d’Ising plan dans une boîte finie carrée et nous remplaçons le paramètre de température par une fonction dépendant de la magnétisation. Cela crée une rétroaction de la configuration de spin sur le paramètre, qui force le système vers le point critique. En utilisant les résultats de lois d’échelle de Cerf et Messikh (Probab Theory Relat Fields 150(1–2):193–217, 2011), nous montrons que, lorsque la taille de la boîte tend vers l’infini, la température se concentre autour de la température critique du modèle d’Ising sur le réseau carré
Une extension du modèle d'Ising Curie-Weiss de criticité auto-organisée avec des interactions à longue portée
No full text53 pagesOutdated article, was merged with "An extension of the Ising-Curie-Weiss model of self-organized criticality with a threshold on the interaction range"
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Autour de la criticité auto-organisée
No full textMany models in physics present a phenomenon called phase transition: there is a critical point or a critical curve in the parameter space separating two distinct regions characterized by very different macroscopic properties. In such systems, the behaviour at the critical point is of particular interest and presents some scaling laws which appear to be universal across a wide range of different systems. The physicists Per Bak, Chao Tang and Kurt Wiesenfeld pointed out that these "critical" features are very common in nature, although they should only appear when the parameters happen to be finely tuned to the critical point. To explain this, they showed that some systems tend to be naturally attracted by critical points or critical regimes. This phenomenon is called "self-organized criticality". The goal of this thesis is to construct several simple models which present this phenomenon. To achieve this, we consider a model with a phase transition and we modify it in order to obtain a "self-critical" behaviour. We study a modification of a model constructed by Matthias Gorny from the generalized Ising Curie-Weiss model, in which the mean-field Hamiltonian is replaced by a long-range interaction. Several other models of self-organized criticality are constructed from Bernoulli percolation in finite boxes, and from the planar Ising model.De nombreux modèles physiques présentent un phénomène appelé transition de phase : il existe un point critique ou une courbe critique dans l'espace des paramètres qui sépare deux régimes distincts caractérisés par des propriétés macroscopiques très différentes. Le comportement de ces systèmes au point critique est particulièrement intéressant et fait apparaître des lois d'échelle qui sont souvent communes à tout un ensemble de systèmes très différents. Les physiciens Per Bak, Chao Tang et Kurt Wiesenfeld ont remarqué que ces comportements "critiques" sont étonnamment communs dans la nature, alors qu'ils ne devraient survenir que lorsque les paramètres se trouvent être précisément ajustés au point critique. Pour expliquer cela, ils ont montré que certains systèmes ont tendance à être naturellement attirés vers des points ou des régimes critiques. Ces systèmes présentent un phénomène appelé "criticité auto-organisée". Cette thèse porte sur la construction de plusieurs modèles simples présentant ce phénomène. Pour cela, nous partons d'un modèle présentant une transition de phase et nous le modifions pour forcer un comportement "auto-critique". Nous étudions notamment une variante d'un modèle construit par Matthias Gorny à partir du modèle d'Ising Curie-Weiss généralisé, en passant d'un modèle de type champ moyen à une interaction limitée à une certaine portée. Nous construisons également quelques modèles de criticité auto-organisée à partir de la percolation Bernoulli dans des boîtes finies, ainsi qu'à partir du modèle d'Ising en dimension 2
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