1,720,961 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Techniques variationnelles pour l'analyse d'images et la compression vidéo
No full textIn this thesis, we will propose mathematical models and methods based on partial differential equations to compress images and videos. In the first part, we will propose a mathematical criterion allowing us to locate the best pixels to keep within an image in the case where the inpainting method is the heat equation. To do so, we will write the compression problem as a shape optimization problem, whose cost will be an "error" between the original image and the decompressed/reconstructed image. Initially, we will restrict ourselves to the cost L² and to the first iteration of a time-explicit scheme of the heat equation. We will be able to make explicit a selection criterion using the topological gradient and a relaxed criterion. We will extend this criterion to the case of an iterative pixel selection procedure considering this time any iteration of the inpainting, thus improving the performance of the method. In a second part, we will study the case of a more general cost, for which a criterion will be given by the adjoint method. In the second part, we will focus on the case of video compression by studying the optical flow. We will propose a new optical flow model using the optimal transport. Finally, in the third part, we will implement a complete video codec and compare it with existing codecs. We will compare the effective size of the compressed video and the quality of the decompressed video. Finally, we will propose GPU computing to accelerate the numerical resolution of the equations.Dans cette thèse, nous allons proposer des modèles et des méthodes mathématiques basées sur les équations aux dérivées partielles permettant de compresser des images ainsi que des vidéos. Dans la première partie, nous allons proposer un critère mathématique permettant de localiser les meilleurs pixels à garder au sein d’une image dans le cas où la méthode d’inpainting est l’équation de la chaleur. Pour cela, nous écrirons le problème de compression comme un problème d’optimisation de forme, dont le coût sera une “erreur” entre l’image d’origine et l’image décompressée/reconstruite. Dans un premier temps, nous nous restreindrons au coût L² ainsi qu’à la première itération d’un schéma explicite en temps de l’équation de la chaleur. Nous pourrons expliciter un critère de sélection au moyen du gradient topologique et un critère relâché. Nous étendons ce critère au cas d’une procédure itérative de sélection des pixels en considérant cette fois-ci une itération quelconque de l’inpainting, améliorant ainsi les performances de la méthode. Dans un second temps, nous étudierons le cas d’un coût plus général, dont un critère sera donné par la méthode de l’adjoint. Dans la seconde partie, nous nous intéresserons au cas de la compression vidéo en étudiant le flot optique. Nous proposerons un nouveau modèle de flot optique utilisant le transport optimal. Enfin, dans la troisième partie, nous implémenterons un codec vidéo complet et nous le comparerons avec les codecs existants. Nous comparerons la taille effective de la vidéo compressée ainsi que la qualité de la vidéo décompressée. Pour finir, nous proposerons du calcul sur GPU afin d’accélérer la résolution numérique des équations
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
Variational methods for PDE-based image and video compression
No full textDans cette thèse, nous allons proposer des modèles et des méthodes mathématiques basées sur les équations aux dérivées partielles permettant de compresser des images ainsi que des vidéos. Dans la première partie, nous allons proposer un critère mathématique permettant de localiser les meilleurs pixels à garder au sein d’une image dans le cas où la méthode d’inpainting est l’équation de la chaleur. Pour cela, nous écrirons le problème de compression comme un problème d’optimisation de forme, dont le coût sera une “erreur” entre l’image d’origine et l’image décompressée/reconstruite. Dans un premier temps, nous nous restreindrons au coût L² ainsi qu’à la première itération d’un schéma explicite en temps de l’équation de la chaleur. Nous pourrons expliciter un critère de sélection au moyen du gradient topologique et un critère relâché. Nous étendons ce critère au cas d’une procédure itérative de sélection des pixels en considérant cette fois-ci une itération quelconque de l’inpainting, améliorant ainsi les performances de la méthode. Dans un second temps, nous étudierons le cas d’un coût plus général, dont un critère sera donné par la méthode de l’adjoint. Dans la seconde partie, nous nous intéresserons au cas de la compression vidéo en étudiant le flot optique. Nous proposerons un nouveau modèle de flot optique utilisant le transport optimal. Enfin, dans la troisième partie, nous implémenterons un codec vidéo complet et nous le comparerons avec les codecs existants. Nous comparerons la taille effective de la vidéo compressée ainsi que la qualité de la vidéo décompressée. Pour finir, nous proposerons du calcul sur GPU afin d’accélérer la résolution numérique des équations.In this thesis, we will propose mathematical models and methods based on partial differential equations to compress images and videos. In the first part, we will propose a mathematical criterion allowing us to locate the best pixels to keep within an image in the case where the inpainting method is the heat equation. To do so, we will write the compression problem as a shape optimization problem, whose cost will be an "error" between the original image and the decompressed/reconstructed image. Initially, we will restrict ourselves to the cost L² and to the first iteration of a time-explicit scheme of the heat equation. We will be able to make explicit a selection criterion using the topological gradient and a relaxed criterion. We will extend this criterion to the case of an iterative pixel selection procedure considering this time any iteration of the inpainting, thus improving the performance of the method. In a second part, we will study the case of a more general cost, for which a criterion will be given by the adjoint method. In the second part, we will focus on the case of video compression by studying the optical flow. We will propose a new optical flow model using the optimal transport. Finally, in the third part, we will implement a complete video codec and compare it with existing codecs. We will compare the effective size of the compressed video and the quality of the decompressed video. Finally, we will propose GPU computing to accelerate the numerical resolution of the equations
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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