1,720,968 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
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
Efficacité énergétique des communications Device-to-Device dans les réseaux hétérogènes
No full textThe objective of this thesis is the study of the energy efficiency of D2D communications in heterogeneous networks. We first propose to analyze the energy consumption of a three device, then introduce a new topology taking into account the data entropy, in order to increase the overall energy efficiency. Subsequently, we study the energy consumption and the influence of interference in a cell for the use case of a natural disaster. We then introduce a new resource allocation protocol based on Fuzzy C-Means clustering. We then use tools and metrics from stochastic geometry to analyze and compare energy and spectral efficiency among multiple types of networks comprising D2D communications. The first study is done on a network in which the cellular and WiFi resources are shared. In a second step, we introduce the notions of directional antennas with millimeter waves. To do this, we evaluate the influence of the mmWave channel and introduce the conceptsof blocking, and sectored models of antennas, for mathematical purposes. The use of millimeter waves, and more particularly ULA directional antennas, proves to be a totally appropriate choice in the primary objective of this thesis, which is to increase both the spectral efficiency (therefore the bit rate) and the energy efficiency within a heterogeneous network including D2D communications.L'objectif de cette thèse est l'étude de l'efficacité énergétique des communications D2D dans les réseaux hétérogènes. Nous proposons dans un premier temps d'analyser la consommation énergétique d'un réseau de trois appareils, puis introduisons une nouvelle topologie prenant en compte l'entropie de données, afin d'augmenter l'efficacité énergétique globale. Par la suite, nous étudions la consommation énergétique et l'influence des interférences sur une cellule dans le cas pratique d'une catastrophe naturelle. Nous introduisons alors un nouveau protocoled'allocation de ressources basé sur le clustering en Fuzzy C-Means. Nous utilisons ensuite des outils et métriques issus de la géométriestochastique afin d'analyser et de comparer l'efficacité énergétique et spectrale au sein de plusieurs types de réseaux munis de communications D2D. Dans un deuxième temps, nous introduisons les notions d'antennes directionnelles avec des ondes millimétriques. Pour ce faire, nous évaluons l'influence du canal millimétrique et introduisons les concepts de blocage, et de modèles sectorisés d'antennes, à des fins mathématiques. L'utilisation d'ondes millimétriques, et plus particulièrement d'antennes directionnelles ULA, s'avère être un choix totalement opportun dans l'objectif premier de cette thèse qui est d'augmenter à la fois l'efficacité spectrale (donc le débit) et l'efficacité énergétique au sein d'un réseau hétérogène comprenant des communications D2D
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Energy analysis and modeling of IoT communication networks
No full textL’IoT est un concept innovant qui permet à des objets d’échanger des informations à travers des réseaux de communications. Ces objets sont généralement déployés avec des ressources énergétiques limitées et les protocoles de communications pour l’IoT doivent tenir compte de ces contraintes. Dans cette thèse, nous avons analysé et modélisé la consommation énergétique de deux des protocoles de communication les plus en vue de l’IoT. Dans un premier temps, nous nous sommes intéressés au Wi-Fi HaLow. Après une présentation descriptive de ce protocole et de ses mécanismes, ses performances ont été étudiées et qualifiées. Des campagnes de mesures ont montré son bon comportement en termes de portée, de débit et de latence. L’analyse du protocole ainsi que des mesures de l’énergie consommée sur du matériel ont permis d’établir un premier modèle de consommation. Ce dernier tient compte des échanges nécessaires à l’établissement d’une communication. Le modèle a ensuite été affiné pour obtenir une modélisation basée sur une chaîne de Markov absorbante qui prend en compte l’environnement et la densité du réseau. Cette étude permet de valider l’utilisation de cette technologie dans différents domaines de l’IoT. Dans un second temps, nous nous sommes intéressés au protocole LoRaWAN. Des mesures de l’énergie consommée sur du matériel ont permis de proposer un nouveau modèle de consommation énergétique qui prend en compte l’environnement du nœud (retransmissions, erreurs et collisions). Finalement, une comparaison des métriques et de la consommation énergétique de ces deux protocoles a été réalisée, afin d’ouvrir une discussion sur les perspectives d’utilisation selon des cas d’usage.IoT is an innovative concept that enables objects to exchange data over communications networks. These objects are typically deployed with limited energy resources, and IoT communication protocols must take these constraints into account. In this thesis, we analyzed and modeled the energy consumption of two of the most prominent IoT communication protocols. First, we focused on Wi-Fi HaLow. After a descriptive presentation of this protocol and its mechanisms, performance was studied and characterized. Measurement campaigns showed that it performs well in terms of range, throughput and latency. Analysis of the protocol and measurements of the energy consumed on hardware have enabled us to establish an initial consumption model. This takes into account the exchanges required to establish a communication. The model was then refined to obtain a model based on an absorbing Markov chain that takes into account the environment and network density. This study validates the use of this technology in various IoT domains.We then turned our attention to the LoRaWAN protocol. Measurements of the energy consumed on hardware enabled us to propose a new energy consumption model that takes into account the node’s environment (retransmissions, errors and collisions). Finally, a comparison of the metrics and energy consumption of these two protocols was carried out, in order to open a discussion on the prospects for use cases
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