1,721,076 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
Design of a communicating gate driver for SiC MOSFET
No full textLes semi-conducteurs présents dans les convertisseurs de puissance sont associés à un circuit de commande rapprochée appelé « driver ». Ce circuit sert d’interface entre l’électronique de contrôle-commande et les modules de puissance qu’il pilote. Dans le cadre des travaux de thèse, un driver dédié aux transistors MOSFET SiC a été développé. Il est conçu pour des modules dont le calibre en courant est de 300A et travaillant sous une tension de bus continu de 1200V. Au-delà de la conception d’un driver spécifique aux transistors MOSFET SiC, un second aspect des travaux de thèse a consisté à implémenter des fonctions de communication dans les convertisseurs. Les drivers sont alors des éléments incontournables du réseau de communication ainsi formé. Un canal de communication compatible avec les exigences normatives relatives aux drivers et avec les contraintes de l’environnement de travail de l’électronique de puissance a été conçu. Il se positionne entre le primaire du driver et chacune de ses voies de commande , permettant ainsi au réseau de communication du convertisseur de s’étendre jusqu’à la zone où le potentiel du bus DC de 1200V est présent. L’isolation galvanique indispensable à la sécurité des utilisateurs est conservée et la capacité parasite induite par l’ajout de cette fonctionnalité reste inférieure à 2pF. Les applications rendues possibles par ce canal de communication sont discutées. Des essais expérimentaux réalisés sous fortes contraintes électriques (2kV / 125kV/μs) valident le fonctionnement du prototype de canal de communication développé. Des transmissions de données à une vitesse de 500kbits/s se basant sur le protocole CAN ont été réalisées avec succès.The semiconductors used in power converters such as IGBT and MOSFET transistors are driven by an electronic circuit called “gate driver”. This circuit is an interface between the control command circuit and the power semiconductors. In the work done during this PhD, a driver dedicated to SiC MOSFET transistors has been developed. It is designed for components with a continuous drain current value of 300A and working under a drain- source voltage of 1200V. Beyond the development of a driver dedicated to SiC M OSFET transistors technology, a second aspect of the work presented in this PhD is about the implementation of communication functions within the power converters. Drivers are then essential elements of the communication network then constituted. A communi cation channel that suits the standards requirements relating to drivers and suits the requirements concerning the power electronics working environment has been designed. It is located between the primary side of the driver and each of its channels. Thus, the communication network in the power converter reaches the area where the DC bus voltage of 1200V is situated. The galvanic isolation necessary to the user’s safety is kept and the parasitic capacitance induced by the addition of this communication func tion remains lower than 2pF. The possible uses offered by this communication channel are discussed. Some trials done under high electric constraints (2kV / 125kV/μs) validate the functioning of the prototype of the communication channel that has been devel oped. Data transmissions reaching a speed of 500kbits/s and based on CAN protocol have been carried out
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
Realization and energy optimization of a recharging station for electric vehides with fixed storage and photovoltaic panels
No full textLa raréfaction des énergies fossiles, la croissance de leur prix et les préoccupations environnementales comme l’augmentation de la concentration des gaz à effet de serre, a précipité l’essor de la traction électrique dans le domaine des véhicules de tourisme et utilitaires. Cette évolution ne sera pas sans conséquence pour le réseau électrique. Les gestionnaires du réseau de distribution électrique prennent aujourd’hui conscience des défis qu’ils vont devoir relever pour accompagner l’essor du VE dans de bonnes conditions. C’est dans ce cadre que des solutions de recharge intelligente ont été développées en partenariat avec le gestionnaire de réseau de distribution électrique, et sont testées grâce à un terrain expérimental réel qui a pu être mis en place pour quantifier l’impact local de la recharge électrique. En s’appuyant sur les travaux scientifiques du domaine de la gestion dénergie, et en particulier des théories de programmation dynamique, des algorithmes ont pu être développés. Ces algorithmes de gestion d’énergie conçus pour piloter une installation complète comportant des équipements de production, de stockage d’énergie, et de recharge de véhicules électriques ont été étudiés, développés et testés en simulation. Parallèlement, une plateforme expérimentale multi-sources intégrant des énergies renouvelables a pu être réalisée et installée sur site pour des usages en conditions réelles.The scarcity of fossil fuels, the growth in their price and global environmental concerns such as the increase in the concentration of greenhouse gases, have precipitated the development of electric traction in the field of passenger and commercial vehicles. However this development will not be without consequences for the electricity grid. Electric grid operators are now aware of the challenges they will have to meet in the coming years to support the growth of Evs under the right conditions. It is in this context that intelligent recharging solutions have been developed in partnership with the electricity distribution network operator, and are beingtested thanks to a real experimental field that has been set up to quantify the local impact of electric recharging. Based on scientific work in the field of energy management, and in particular dynamic programming theories, algorithms have been developed. These energy management algorithms, designed to control a complete installation including production, energy storage and recharging equipment for electric vehicles, have been studied, developed and tested in simulation. At the same time, a multi-source experimental platform integrating renewable energy sources was built and installed on site for use in real conditions
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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