1,720,956 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
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
Modélisation microscopique et macroscopique du trafic routier
No full textThis thesis deals with the modeling of local and non local Hamilton-Jacobi equations, and their applications to traffic flow. We are concerned with periodic and stochastic Hamilton-Jacobi equations given at two different scales: microscopic and macroscopic. In fact, at the microscopic scale, we describe the dynamic of each vehicle individually and at the macroscopic scale, we describe the traffic in terms of density. From a modeling point of view, the periodic setting means that all the vehicles are identical. This assumption allows to get very interesting results and to justify macroscopic models but it is not very realistic. In contrast to the periodic setting, we also investigate the stochastic setting in which the type of drivers are randomly distributed. In this work we use the theory of viscosity solution, and we derive macroscopic models from microscopic models. We present the specified periodic and stochastic homogenization of first order evolutive Hamilton-Jacobi equations posed on a junction. The first part of this work contains a periodic homogenization of a Hamilton-Jacobi equation posed on junction. In the second part, we prove a specified stochastic homogenization of first order evolutive Hamilton-Jacobi equations on a very simple junction, i.e the real line with a junction at the origin. The main difficulty and novelty of this work comes from the fact that the hamiltonian is not stationary ergodic. Finally, in the last part, we propose a non-local Hamilton-Jacobi model for traffic flow and we prove the existence and uniqueness of the solution of this model. We also propose a numerical scheme and we prove an error estimate between the continuous solution of this problem and the numerical one.Cette thèse porte sur la modélisation des équations d'Hamilton-Jacobi, locales et non locales, et leurs applications en trafic routier. On considère dans ce travail des équations d'Hamilton-Jacobi périodiques et stochastiques données à deux échelles différentes : microscopique et macroscopique. À l'échelle microscopique, on décrit la vitesse de chaque véhicule individuellement alors qu'à l'échelle macroscopique, on décrit le trafic en termes de densité. D'un point de vue modélisation, le cadre périodique signifie que tous les véhicules sont identiques. Cette hypothèse permet d'obtenir des résultats très intéressants et de justifier des modèles macroscopiques mais elle n'est pas très réaliste. Contrairement au cadre périodique, nous étudions également le cadre stochastique dans lequel le type de conducteurs est reparti de façon aléatoire. Dans ce travail, nous utilisons la théorie des solutions de viscosité et nous dérivons des modèles macroscopiques à partir de problèmes microscopiques. Nous présentons des résultats d'homogénéisation précisée des équations d'Hamilton-Jacobi périodiques et stochastiques, de premier ordre posées sur une jonction. La première partie de ce travail contient un résultat d'homogénéisation périodique d'une équation d'Hamilton-Jacobi posée sur une jonction. Dans la deuxième partie, nous démontrons un résultat d'homogénéisation stochastique précisée des équations de Hamilton-Jacobi posées sur la ligne réelle avec une jonction à l'origine. La difficulté principale et la nouveauté de ce travail vient du fait que l'hamiltonien n'est pas stationnaire ergodique. Enfin, dans la dernière partie, nous proposons un modèle du type Hamilton-Jacobi non local pour le trafic routier et nous prouvons l'existence et l'unicité de la solution de ce modèle. Nous proposons également un schéma numérique et nous prouvons une estimation d’erreur entre la solution continue de ce problème et la solution numérique
Microscopic and macroscopic modeling of road traffic
No full textCette thèse porte sur la modélisation des équations d'Hamilton-Jacobi, locales et non locales, et leurs applications en trafic routier. On considère dans ce travail des équations d'Hamilton-Jacobi périodiques et stochastiques données à deux échelles différentes : microscopique et macroscopique. À l'échelle microscopique, on décrit la vitesse de chaque véhicule individuellement alors qu'à l'échelle macroscopique, on décrit le trafic en termes de densité. D'un point de vue modélisation, le cadre périodique signifie que tous les véhicules sont identiques. Cette hypothèse permet d'obtenir des résultats très intéressants et de justifier des modèles macroscopiques mais elle n'est pas très réaliste. Contrairement au cadre périodique, nous étudions également le cadre stochastique dans lequel le type de conducteurs est reparti de façon aléatoire. Dans ce travail, nous utilisons la théorie des solutions de viscosité et nous dérivons des modèles macroscopiques à partir de problèmes microscopiques. Nous présentons des résultats d'homogénéisation précisée des équations d'Hamilton-Jacobi périodiques et stochastiques, de premier ordre posées sur une jonction. La première partie de ce travail contient un résultat d'homogénéisation périodique d'une équation d'Hamilton-Jacobi posée sur une jonction. Dans la deuxième partie, nous démontrons un résultat d'homogénéisation stochastique précisée des équations de Hamilton-Jacobi posées sur la ligne réelle avec une jonction à l'origine. La difficulté principale et la nouveauté de ce travail vient du fait que l'hamiltonien n'est pas stationnaire ergodique. Enfin, dans la dernière partie, nous proposons un modèle du type Hamilton-Jacobi non local pour le trafic routier et nous prouvons l'existence et l'unicité de la solution de ce modèle. Nous proposons également un schéma numérique et nous prouvons une estimation d’erreur entre la solution continue de ce problème et la solution numérique.This thesis deals with the modeling of local and non local Hamilton-Jacobi equations, and their applications to traffic flow. We are concerned with periodic and stochastic Hamilton-Jacobi equations given at two different scales: microscopic and macroscopic. In fact, at the microscopic scale, we describe the dynamic of each vehicle individually and at the macroscopic scale, we describe the traffic in terms of density. From a modeling point of view, the periodic setting means that all the vehicles are identical. This assumption allows to get very interesting results and to justify macroscopic models but it is not very realistic. In contrast to the periodic setting, we also investigate the stochastic setting in which the type of drivers are randomly distributed. In this work we use the theory of viscosity solution, and we derive macroscopic models from microscopic models. We present the specified periodic and stochastic homogenization of first order evolutive Hamilton-Jacobi equations posed on a junction. The first part of this work contains a periodic homogenization of a Hamilton-Jacobi equation posed on junction. In the second part, we prove a specified stochastic homogenization of first order evolutive Hamilton-Jacobi equations on a very simple junction, i.e the real line with a junction at the origin. The main difficulty and novelty of this work comes from the fact that the hamiltonian is not stationary ergodic. Finally, in the last part, we propose a non-local Hamilton-Jacobi model for traffic flow and we prove the existence and uniqueness of the solution of this model. We also propose a numerical scheme and we prove an error estimate between the continuous solution of this problem and the numerical one
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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