1,720,956 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
Les sous-espaces de Krylov pour les Problèmes Inverses Linéaires et Application au Traitement d'Image
No full textImage restoration often requires the solution of large linear systems of equations with a very ill-conditioned, possibly singular, matrix and an error-contaminated right-hand side. The latter represents the available blur and noise-contaminated image, while the matrix models the blurring. Computation of a meaningful restoration of the available image requires the use of a regularization method. We consider the situation when the blurring matrix has a Kronecker product structure and an estimate of the norm of the desired image is available, and illustrate that efficient restoration of the available image can be achieved by Tikhonov regularization based on the global Lanczos method, and by using the connection of the latter to Gauss-type quadrature rules. We also investigate the use of the global Golub-Kahan bidiagonalization method to reduce the given large problem to a small one. The small problem is solved by employing Tikhonov regularization. A regularization parameter determines the amount of regularization. The connection between global Golub-Kahan bidiagonalization and Gauss-type quadrature rules is exploited to inexpensivelycompute bounds that are useful for determining the regularization parameter by the discrepancy principle. We will also present an efficient algorithm for solving the Tikhonov regularization problem of a linear system of equations with multiple right-hand sides contaminated by errors. The proposed algorithm is based on the symmetric block Lanczos algorithm, in connection with block Gauss quadrature rules. We will show how this connection is designed to inexpensively determine a value of the regularization parameter when a solution norm constraint is given. Next, we will present four algorithms for the solution of linear discrete ill-posed problems with several right-hand side vectors. These algorithms can be applied, for instance, to multi-channel image restoration when the image degradation model is described by a linear system of equations with multiple right-hand sides that are contaminated by errors. Two of the algorithms are block generalizations of the standard Golub-Kahan bidiagonalization method with the block size equal to the number of channels. One algorithm uses standard Golub-Kahan bidiagonalization without restarts for all right-hand sides. These schemes are compared to standard Golub-Kahan bidiagonalization applied to each right-hand side independently. Tikhonov regularization is used to avoid severe error propagation. Applications include the restoration of color images are given. We will finally give efficient algorithms to solve total variation (TV) regularization of images contaminated by blur and additive noise. The unconstrained structure of the problem suggests that one can solve a constrained optimization by transforming the original unconstrained minimization problem to an equivalent constrained minimization problem. An augmented Lagrangian method is used to handle the constraints, and an alternating direction method (ADM) is used to iteratively find solutions of the subproblems. The solution of these subproblems are belonging to subspaces generated by application of successive orthogonal projections onto a class generalized matrix Krylov subspaces of increasing dimension.La restauration d’image nécessite souvent la résolution de grands systèmes linéaires d’équations avec matrice très mal conditionnée, peut-être singulière et un second membre contaminé par une erreur. Ce dernier représente l’image disponible contaminée par le flou et le bruit, tandis que la matrice modélise le flou. La restauration d'une image flou et bruitee nécessite souvent l'utilisation d'une méthode de régularisation. Nous considérons la situation lorsque la matrice de flou a une structure de produit Kronecker et une estimation de la norme de la l’image est disponible et on illustre qu’une restauration efficace de l’image peut être achevée en résolvant la régularisation de Tikhonov par la méthode de Lanczos globale et en utilisant la connexion de ces dernières aux règles de quadrature de type Gauss. Nous étudions également l'utilisation de la méthode de bidiagonalisation globale de Golub-Kahan pour réduire le grand problème à un problème de petite taille. Le petit problème est résolu en utilisant la régularisation de Tikhonov. Le lien entre La bidiagonalisation globale de Golub-Kahan et les règles de quadrature de type Gauss sont exploitées de manière moins coûteuse pour calculer les bornes qui sont utiles pour déterminer le paramètre de régularisation par le principe de '' discrepancy''. Nous présenterons également un algorithme efficace pour résoudre le Problème de régularisation de Tikhonov d’un système linéaire d’équations à plusieurs second membre contaminés par des erreurs. L'algorithme proposé est basé sur Lanczos par bloc, en relation avec les règles de quadrature de Gauss par bloc. Nous allons montrer comment cette connexion est conçue pour déterminer une valeur du paramètre de regularisation lorsqu'une contrainte de norme de solution est donnée. Ensuite, nous présenterons quatre algorithmes pour la solution de problèmes linéaires discrets mal posés avec plusieurs second membre. Ces algorithmes peuvent être appliqués, par exemple, à la restauration d’images multicanaux lorsque le modèle de dégradation d'image est décrit par un système linéaire d'équations à plusieurs second membre contaminés par des erreurs. Deux des algorithmes sont des généralisations en bloc de la méthode standard de bidiagonalisation de Golub-Kahan avec la taille du bloc égal au nombre de canaux. Un algorithme utilise la bidiagonalisation standard de Golub-Kahan sans redémarrage pour tous les second membres. Ces régimes sont comparés au Golub-Kahan standard qui s’applique indépendamment à chaque second membre. La régularisation de Tikhonov est utilisée pour éviter une propagation d'erreur grave. Les applications incluent la restauration des images en couleur sont données. Nous allons enfin donner des algorithmes efficaces pour résoudre la régularisation par variation total (Total Variation TV) d’images contaminées par le flou et le bruit additif et multiplicatif. La structure non contrainte du problème suggère que l'on peut résoudre une optimisation sous contrainteen transformant le problème initial de minimisation sans contrainte en un problème de minimisation équivalent sous contrainte. Une méthode de lagrangienne augmentée est utilisée pour traiter les contraintes, et une méthode de direction alternative (ADM) est utilisée pour trouver de manière itérative des solutions des sous-problèmes. La solution de ces sous-problèmes appartient aux sous-espaces générés par application de projections orthogonales successives sur une classe généralisée de sous-espaces de Krylov.
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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