1,720,959 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
Study and control of three dimensional flow separations in a high pressure compressor stator blade row by boundary layer aspiration
No full textLa performance du système de compression des turbomachines est limitée en grande partie par les décollements tridimensionnels; ils sont plus importants au niveau des parois internes où le fluide a tendance à décélérer dans les zones de faible impulsion. Ce travail de recherche met en œuvre l'aspiration de la couche limite afin de maîtriser les décollements dans les compresseurs. Ceci est obtenu par la mise en place de dispositifs d'aspiration sur le moyeu etle profil de l’aube afin de prélever judicieusement le fluide à faible énergie dans les couches limites et ainsi augmenter le taux de compression par étage. Cette thèse est issue de travaux de recherche réalisés conjointement avec l'Ecole Centrale de Lyon (ECL), l’Ecole Polytechnique Fédérale de Lausanne (EPFL) et l'ONERA. Ces travaux ont été financés par la Commission Européenne dans le cadre du programme NEWAC et l’entreprise SNECMA.Le cas test est une grille annulaire de redresseur conçu pour fonctionner avec des conditions d'entrée transsoniques. Des calculs stationnaires tridimensionnels RANS sont réalisés afin de définir la plage de fonctionnement de la grille en mettant l'accent sur l'étude des topologies d’écoulement aube-a-aube afin de comprendre la formation et la progression du décollement de coin au moyeu avec des incidences d'entrée croissantes. L’aspiration est réalisée sur le moyeu par une fente afin de mieux maîtriser les décollements tridimensionnels et ainsi accroître le taux de compression et la plage de fonctionnement. L'aspiration est sensible au débit massique aspiré; de faibles débits aspirés conduisent à des topologies d’écoulements complexes avec des performances dégradées, tandis que des débits aspirés plus élevés permettent de supprimer le décollement de coin et d'améliorer la performance à l’exception du point de plus forte incidence. L'analyse des topologies montre une recirculation de l'écoulement entre la cavité d'aspiration et la veine. Ce phénomène d’écoulement tridimensionnel très complexe influe sur la performance des aubages. Ainsi l'étude des topologies permet d’orienter le choix dans l’implémentation de systèmes conduisant à une meilleure maîtrise des écoulements.Cette stratégie d’aspiration est étudiée expérimentalement à l'EPFL où l'aspiration a été mise en œuvre au moyeu. Une nouvelle série d'études numériques réalisées avec les conditions d'entrée mesurées sur le banc d’essais associées à des hypothèses de calcul conduisent à une assez bonne concordance entre les mesures d’essais et la simulation numérique. En particulier, le décollement de coin est bien prédit par les calculs numériques.Des études théoriques ont été menées afin d’appliquer l'aspiration sur le profil de la pale et ainsi améliorer la capacité de diffusion des pales. Des études de sensibilité ont été réalisées sur divers paramètres tels que le positionnement des fentes d’aspiration et le débit aspiré qui ont conduit au choix d’une configuration finale retenue pour les essais. Des études réalisées avec de multiples et plus petites fentes d’aspiration sur le profil de la pale montrent le bien fondé de l'application d’un contrôle d’écoulement localisé sur les points critiques associés à des décollements. Ceci montre l’enjeu d'atteindre des niveaux de performance supérieurs avec des débits aspirés plus faibles.The performance of the compression system of a gas turbine engine is limited for a large part by the three-dimensional separations occurring in the high pressure compressors. The effects of flow separation are more important in the endwall regions where the fluid tends to decelerate and accumulate in regions of low momentum. The theme of this research work is to implement boundary layer aspiration to control flow separations in high pressure compressors. This is achieved by implementing aspiration devices on the endwall and blade profile to judiciously remove low energy fluid in the boundary layers that enables higher pressure rise per stage. This thesis is a joint scientific work associating Ecole Centrale de Lyon (ECL), Ecole Polytechnique Federale de Lausanne (EPFL) and ONERA. The European Commission under the frame of the programme NEWAC and the enterprise SNECMA has financed this research work. The test case is a stator blade row designed to operate with transonic inlet conditions. Three-dimensionalsteady state RANS computational studies are done to define the operating range of the cascade with emphasis on the study of blade-to-blade flow topologies to understand the formation and progression of the corner separation on the hub wall with increasing inlet incidences. Boundary layer aspiration is implemented on the hub wall to control the threedimensional flow separations to improve the pressure rise and the operating range. The aspiration strategy is sensitive to the aspirated massflow; lower aspirated flow rate results incomplex flow separation topologies with deteriorated performance, while higher aspirated flow rate is found to suppress the corner separation and improve the diffusion capability except at the highest incidence point. The analysis of flow topologies shows the recirculation of flow between the aspiration cavity and the blade passage; a highly complex three-dimensionalflow phenomena that influences the blade performance. The study of flow topologies is instrumental in developing rationales for the implementation of flow control.This aspiration strategy is studied experimentally at EPFL where aspiration has been implemented on the hub wall. A new set of numerical studies done with inlet conditions measured from the test bench associated with rational hypothesis concludes this task with reasonable agreement between the experiments and numerical simulation. In particular, the hub corner separation is predicted well by CFD.Computational studies are done to implement aspiration on the blade profile to improve the diffusion capability of the blades; various sensitivity parameters such as aspiration slot locations, aspirated flow rate are studied and a configuration is finalised for the experiments to be followed. Some studies are performed with smaller and multiple slots on the blade profile. The results show the merit of applying localised flow control on the critical points associated with flow separation demonstrating the scope to achieve higher levels of performance with lower aspirated flow rates
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Project Manager’s Perception of Agile Methods Success
Full text linkSince it’s inception in 1970, the Waterfall model has been widely accepted and proven to be quite effective in the software technology development. As years have passed, there has been a rise in the number of technology companies and such rapid expansion in the software industry has called for frequent changes and swift delivery. To cope up with the increasing expectations, companies started to adopt new development processes and as a result, businesses witnessed several different process and Agile development methodologies like Scrum, Extreme Programming, Test Driven Development, to name a few. Companies were able to effectively work with change requirements while working on successive iterations. This paper would throw light on the existing software development trends and whether agile methodologies are merely a fad or an absolute necessity for the software industry. This paper is a competitive study of three companies analyzing transition of projects before and after Agile measured through customer acceptance and other indicators. The paper would also drill down on the type of resources and involvement of Agile system demands and whether or not there is a possibility of Agile methodologies been overthrown by any potent successor in the near future. The paper would talk about different styles of leadership techniques adopted in Agile and which type would be best suited for any Agile project. Once singled out the core advantages of Agile, a plan will be created to shift from Waterfall to Agile and learn the core Agile concepts and what should be right way to transform a project into Agile
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