1,720,975 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
Solving integrated problems in a pharmaceutical context : scheduling and routing of vehicles
No full textCette thèse porte sur l'étude et la résolution de problèmes d'optimisation dans le domaine de la production de médicaments de chimiothérapie à l'aide des outils de la Recherche Opérationnelle. Ces travaux de recherche ont été menés en collaboration avec l'hôpital de Tours et l'entreprise Eticsys et ont eu pour but de répondre à deux grands enjeux : la conservation de la qualité de service pour les patients et la réduction des coûts pour le système de santé. Ces travaux s'étendent de l'étude des flux de production d'une unité de biopharmacie à la mise en place d'une solution d'optimisation et d'aide à la décision pour cette unité.Ce manuscrit commence par présenter le contexte hospitalier, les contraintes métiers et sanitaires à prendre en compte lors du processus de modélisation des problèmes planification et d'optimisation au plus proche de la réalité. Le premier problème considéré est formulé comme un problème intégré de production et de livraison. La partie production est modélisée comme un problème d'ordonnancement d'atelier de type flow-shop hybride. La partie livraison s'apparente à un problème de tournées de véhicules multi-trajet. Le deuxième problème étudié est représenté par un problème intégré de production et de gestion de stock. La partie production considérée est cette fois-ci modélisée par un problème d'ordonnancement à machine parallèle avec des périodes d'indisponibilités. La partie gestion des stocks est modélisée comme un problème de bin-packing avec des contraintes de conflits. Plusieurs algorithmes heuristiques sont proposés pour résoudre les problèmes de planification et leurs performances sont évaluées. Une méthode exacte basée sur une exploration arborescente est proposée pour résoudre la partie livraison d'un problème intégré et étudier la qualité des solutions trouvées par les heuristiques de construction d'itinéraires. La gestion des stocks étant intrinsèquement liée à l'ordonnancement de la production, mais indépendante de la livraison, une matheuristique sur une version intégrée production et gestion de stocks du problème est développée.Les résultats montrant l'efficacité des méthodes de résolution proposées, ont encouragé la mise en opération de certains des algorithmes proposés dans un logiciel d'aide à la décision pour un service de l'hôpital de Tours. Les problèmes traités étant généralisables à d'autres services de même nature, la recherche a abouti aussi à la publication de plusieurs articles et communications scientifiques. De nombreuses perspectives d'améliorations des algorithmes et des extensions des modèles sont évoquées afin d'approfondir l'amélioration continue des services hospitaliers.This thesis tackle optimization problems in a chemotherapy drug production context. Their theoretical and practical implications are studied. In collaboration with a hospital and a company, the research aims to respond to two challenges: maintaining the quality of service for patients and reducing costs for the health system. This work goes from a biopharmacy unit production flows study to the implementation of an optimization and aid decision support solution.This manuscript begins by presenting the hospital context, and sanitary constraints. The first problem considered is formulated as an integrated production and routing problem. The production part is modeled as a hybrid flow-shop scheduling problem. The delivery part is a variant of the multi-trip vehicle routing problem. The second problem is represented by an integrated production and cutting stock problem. The production part considered is this time modeled by a parallel machine scheduling problem with unavailability periods. The cutting stock part is modeled as a bin packing problem with conflicts. Several heuristic algorithms for improving the service are proposed and evaluated. An exact method based on multiple branches and bound is also proposed. As the cutting stock is depedent of the production scheduling, but independent of the delivery, a matheuristic approach for the integrated production and cutting stock problem is developed.The efficiencies of the proposed resolution methods encouraged to implement certain of them in an aid decision software for the hospital of Tours. Since the problems dealt could be generalized to other contexts, the research is also relevant to the publication of several scientific articles and communications. Many perspectives for improving algorithms and extensions of models are mentioned in order to deepen the continuous improvement of hospital services
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
Résolution de problèmes intégrés dans un contexte pharmaceutique : ordonnancement et tournée de véhicules
No full textTen years ago, the production unit of chemotherapy preparations of the Bretonneau CHRU (UBCO) made an average of 80 preparations per day on four chains of insulators. Today, thanks to a planning optimization software, developed in collaboration with the Computer Science Laboratory of the University of Tours and the company Eticsys, and the acquisition of other insulators, the UBCO realizes approximately 150 chemotherapy preparations per day, with peaks of up to 220 preparations, while increasing the comfort of the preparers (reduction of activity peaks and stress). A system allowing the complete traceability of productions has also been set up. This software is unique in France. The problem faced by UBCO is twofold: distributing the preparations and finely managing the balances. Chemotherapy preparations have characteristics (of preservation, shelf life) that make planning and delivery problems closely interrelated and need to be studied together. On the other hand, the products are volatile and very expensive and the optimal use of the products allows very substantial savings. The aim of this research is twofold: to organize the rounds so as to deliver patients as quickly as possible, taking into account geographical constraints (logistical times) and upstream production constraints; and make the best use of active drug stocks of chemotherapy preparations to minimize losses.Il y a dix ans, l'unité de production des préparations de chimiothérapie du CHRU Bretonneau (UBCO) réalisait en moyenne 80 préparations par jour sur quatre chaînes d'isolateurs. Aujourd'hui, grâce à un logiciel d'optimisation de la planification, développé en collaboration avec le Laboratoire d'Informatique de l'Université de Tours et la société Eticsys, et l'acquisition d'autres isolateurs, l'UBCO réalise environ 150 préparations de chimiothérapie par jour, avec des pics pouvant aller à 220 préparations, tout en augmentant le confort des préparateurs (réduction des pics d'activité et du stress). Un système permettant la traçabilité complète des productions a également été mis en place. Ces logiciels sont uniques en France. Le problème auquel est confronté l'UBCO est double : distribuer les préparations et gérer finement les reliquats. Les préparations de chimiothérapie ont des caractéristiques (de conservation, de durée de vie) qui font que le problème de planification et celui de la livraison sont étroitement liés, et qu'il faut les étudier de façon conjointe. D'autre part, les produits sont volatiles et très chers et l'utilisation optimale des produits permet des économies très conséquentes. L'objectif de cette recherche est double : organiser les tournées de sorte à livrer les patients dans les meilleures délais en tenant compte des contraintes géographiques (temps logistiques) et des contraintes de production en amont ; et utiliser au mieux les stocks des produits actifs des préparations de chimiothérapie, afin de minimiser les pertes
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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