1,721,096 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
Research for an optimal description of vibro-acoustic sources and systems for the simulation of vehicle pass-by noise
No full textPour commercialiser un véhicule, les constructeurs automobiles doivent se soumettre à la réglementation sur le bruit extérieur. Le règlement de la commission économique pour l'Europe, ECE R51.03, spécifie les niveaux admissibles que peut rayonner un véhicule automobile en roulage. Ce règlement est entré en vigueur depuis le 1er juillet 2016 pour remplacer l'ancien règlement ECE R51.02 (changement de méthode d’essai et sévérisation des niveaux de bruit admissibles). La diminution drastique des niveaux sonores tolérés se fait en trois étapes : passage de 74 dB (A) sous l'ancien règlement, à 68 dB (A) en 2024. Par conséquent, les constructeurs ainsi que les fournisseurs automobiles seront confrontés à un grand défi pour atteindre cet objectif. Ainsi, l'objectif de ces travaux de thèse consiste à développer une aide à la modélisation totale du bruit de passage d’un véhicule, comme le préconisent les essais réglementaires. Le but est de construire des modèles optimaux pour prévoir et évaluer avec précision le bruit que peut rayonner un véhicule en roulage plus tôt dans son cycle de développement, i.e. avant l'étape d'industrialisation. Il faut alors se placer dans la recherche d'un compromis entre précision des estimations, sensibilité aux paramètres, robustesse de la méthode et efficacité numérique.Currently, to put a vehicle on market, car manufacturers must comply to a certification test of exterior noise. The regulation of the United Nations Economic Commission for Europe, ECE R51-03, specifies permissible levels a rolling motor vehicle can emit. This regulation is applied since July 1st, 2016, to replace the old regulation ECE R51-02 (test method change and tightening of permissible levels). The drastic reduction in noise levels will be done in 3 steps: from 74 dB (A) under the old regulation to 68 dB (A) in 2024. Therefore, manufacturers as well as their suppliers will face a great challenge to achieve this goal. The objective of this thesis is to develop an aid to the modeling of the pass-by noise of a vehicle, as called for in regulatory testing. The goal is to predict and evaluate accurately the noise emissions earlier in the vehicle development cycle, i.e. before the industrialization stage. We must then seek a trade-off between accuracy of estimates, sensitivity to parameters, robustness of the method and numerical efficiency
Uncertainty quantification in wind turbine noise modeling
No full textIl existe aujourd'hui un enjeu sociétal majeur à étudier l’émission et la propagation du bruit émis par les éoliennes, et notamment de quantifier l'incertitude sur l'estimation des niveaux sonores. En effet, bien que ces niveaux sonores soient relativement faibles en regard de ceux générés par d’autres sources acoustiques de l’environnement (e.g. les transports terrestres), les nuisances sonores d’origine éolienne sont souvent mises en avant comme gêne potentielle. Ainsi, ces travaux de thèse visent à quantifier la dépendance spatiale et fréquentielle des incertitudes rencontrées en acoustique environnementale, et en particulier concernant le bruit des éoliennes. Pour ce faire, un couplage est réalisé entre un modèle d’émission acoustique permettant de prendre en compte les spécificités acoustiques des éoliennes (spectre et directivité), et un modèle de propagation acoustique permettant de prendre en compte les effets de l’atmosphère (thermique et aérodynamique) et les effets de sol (absorption et rugosité) sur la propagation acoustique. Une analyse de sensibilité est ensuite effectuée afin de déterminer les paramètres de l’environnement les plus influents sur la dispersion des niveaux sonores. Suite au développement d’un métamodèle, une analyse d’incertitude est réalisée afin d’estimer la variabilité totale des niveaux sonores. Enfin, la méthode est appliquée à quelques exemples de situations caractéristiques du contexte éolien.There is a major societal challenge to study the emission and propagation of noise emitted by wind turbines, and in particular to quantify the uncertainty in the estimation of sound levels. Although these sound levels are relatively low compared to those generated by other acoustic sources in the environment (e.g. land transport), noise pollution from wind turbines is often highlighted as a potential nuisance. Thus, this thesis work aims to quantify the spatial and frequency dependence of the uncertainties encountered in environmental acoustics, and in particular concerning wind turbine noise. To do so, a coupling is made between an acoustic emission model allowing to take into account the acoustic specificities of wind turbines (spectrum and directivity), and an acoustic propagation model allowing to take into account the effects of the atmosphere (thermal and aerodynamic vertical profiles) and the ground effects (absorption and roughness) on acoustic propagation. A sensitivity analysis is then carried out to determine the environmental parameters that have the greatest influence on the dispersion of sound levels. Following the development of a metamodel, an uncertainty analysis is carried out to estimate the total variability of the sound levels. Finally the method is applied to some examples of situations characteristic of the wind turbine noise
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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