1,720,981 research outputs found
Développements limités et réversion des séries
No full textwritten in french, 13 pages, 5 figuresWe prove a few new properties of a Hankel transform related to limited series expansions. This preprint superseed the preprint math.CO/0303221 of the first author
Développements limités et réversion des séries
No full textwritten in french, 13 pages, 5 figuresWe prove a few new properties of a Hankel transform related to limited series expansions. This preprint superseed the preprint math.CO/0303221 of the first author
Développements limités et réversion des séries
No full textwritten in french, 13 pages, 5 figuresWe prove a few new properties of a Hankel transform related to limited series expansions. This preprint superseed the preprint math.CO/0303221 of the first author
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
Orientations acycliques et le polynome chromatique
No full textAbstractOn attache à tout graphe G son polynôme chromatiqueχG (λ), qui dénombre ses colorations régulières avecλ couleurs. D’après Stanley, on sait que |χG (−1)| est égal au nombre d’orientations acycliques du graphe, un résultat qui fut raffiné par Greene et Zaslavsky. Nous nous proposons de l’affiner davantage en interprétant, avec l’aide de certaines orientations acycliques, les coefficients deχG (λ) développé en puissances de λ et surtout en puissances de (λ− 1). L’utilisation systématique des fonctions génératrices des fonctions d’ensembles permet d’avoir des démonstrations très courtes et explicatives. Elles se veulent une réponse à la suggestion faite par Gebhard et Sagan, qui ont déjà trouvé des démonstrations combinatoires de deux résultats de Greene et Zaslavsky. Les fonctions d’ensembles permettent aussi d’établir une série d’interprétations nouvelles de l’invariant βGde Crapo. Cet article donne également un nouvel éclat aux résultats classiques de Cartier, Foata, Viennot, Brenti, Gessel et Stanley. The chromatic polynomialχG (λ), which is associated with each graph G, enumerates its regular colorations with λ colors. Stanley showed that |χG (−1)| is equal to the number of acyclic orientations of the graph, a result that was refined by Greene and Zaslavsky. The purpose of the paper is to show that a further refinement can be obtained by interpreting each coefficient of χG(λ), when the polynomial is developed with respect to powers of λ and (λ− 1). A systematic use of the generating functions for set functions enables us to have very short and instructive proofs. Gebhard and Sagan, who had already found combinatorial proofs of two results by Greene and Zaslavsky, suggested that further proofs were to be found. Finally, the set functions algebra allows us to establish a series of new interpretations for Crapo’sβG invariant. This paper also brings a new light to the classical results due to Cartier, Foata, Viennot, Brenti, Gessel and Stanley
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