1,720,978 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
Evaluation of healing tissue after used meshes of polypropylene/polyglecaprone in the repair of defects produced in abdominal wall of rats: the effect of copaiba and andiroba oils
No full textObjetivo: avaliar os efeitos do oleo de copaiba e andiroba na correcao de defeito abdominal tratado com a utilizacao de tela de polipropileno/poliglecaprone em ratos. Metodos: foi criado um defeito na parede abdominal, corrigido com tela de polipropileno/poliglecaprone em 60 ratos. Estes foram aleatoriamente distribuidos em cinco grupos: controle, copaiba por administracao oral (gavagem), andiroba por gavagem, embebimento da tela no oleo de copaiba e embebimento no oleo de andiroba. A eutanasia foi realizada apos 7, 14 e 21 dias de pos operatorio. Foi analisado o processo de cicatrizacao em relacao as telas quanto aos aspectos macroscopicos e microscopicos. Resultados: todos os animais apresentaram aderencias abdominais, sendo estas menores no grupo copaiba gavagem (p<0,05). Na microscopia, todos os animais apresentaram inflamacao na fase aguda, sendo que esta resposta inflamatoria foi mais bem caracterizada pelo granuloma tipo corpo estranho em volta dos fragmentos da tela; este nao foi encontrado no grupo embebido copaiba, conjuntamente com os fragmentos da tela. Houve uma maior zona de necrose e de fibrose no grupo embebido copaiba e andiroba, em relacao ao controle (p<0,05). Os grupos gavagem copaiba e andiroba apresentaram uma maior quantidade de fibras colagenas em relacao ao grupo controle. Conclusao: os oleos de copaiba e andiroba, administrados via gavagem, apresentaram uma modulacao de resposta inflamatoria, comprovado pela diminuicao da quantidade de aderencias, sem prejudicar o processo de cicatrizacao. Os oleos abreviaram o processo de formacao de fibras colagenas. Contudo, quando administrados por via embebimento, prejudicaram o processo de cicatrizacao abdominal, sendo que o oleo de copaiba apresentou efeito corrosivo na telaBV UNIFESP: Teses e dissertaçõe
Use of genetic algorithm with modified operators for optimization of real variable functions
No full textand a novel statistic correlation mutation algorithm (CAM). Both ADX and CAM work with population information to improve existing individuals of the GA and increase the exploration potential via the correlation mutation. Solution-based methods offers good local improvement of already known solutions while lacking at exploring the whole search space, evolutionary algorithms provide better global search in exchange of exploitation power. Methods that increase the search potential are widely used for constrained optimization problems due to increased global and local search capabilities. The GA with the proposed operators improves results of constrained problems by balancing the exploitation and exploration potential of the algorithm. The conducted tests present average performance for various CEC’2015 benchmark problems, while offering good reliability and superior results on path planning problem for redundant manipulator and most of the constrained engineering design problems tested when compared with current works in the literature and classic optimization algorithms.Este trabalho apresenta um Algoritmo Genético que utiliza uma nova operação de crossover (ADX – Adjusted Crossover) e um novo método de mutação através do ajuste baseado em correlação (CAM – Correlation Adjustment Mutation). Ambos os operadores propostos são executados na população do AG, otimizando soluções já existentes (ADX) e aumentando o poder exploratório global do algoritmo através do ajuste correlacional (CAM). Heurísticas puramente baseadas em solução oferecem um bom nível de otimização local (intensificação), no entanto, possuem baixo nível de exploração global do espaço de busca. Por outro lado, algoritmo evolutivos oferecem capacidades exploratórias globais melhores. A partir deste pressuposto, os métodos que buscam o aumento de tais capacidades exploratórias são vastamente utilizados para otimização de problemas com restrições de variáveis, devido à utilização vantajosa do poder de busca das duas abordagens (baseado em solução e evolutivos). Os métodos propostos neste trabalho aumentaram o poder de exploração e intensificação do algoritmo genético utilizado. De acordo com os testes executados, o algoritmo genético com os operadores propostos apresentou resultados melhores para a maioria os problemas clássicos de engenharia quando comparados a outros métodos presentes na literatura. Além disso, obteve bons resultados em problemas de robótica e performance mediana quando utilizados com benchmarks propostos no evento CEC’2015
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
Results obtained by the systematic performance of a cholangiography during the video-laparoscopic cholecystectomy in vesicular lithiasis patients
No full textDesde a sua Introdução por Mirizzi, a realizacao rotineira ou seletiva da colangiografia per-operatoria (CPO) suscitou controversias entre cirurgioes do mundo inteiro, permanecendo a polemica com o advento da video-laparoscopia. O objetivo desta pesquisa foi a analise dos resultados das CPO, realizadas sistematicamente durante as colecistectomias video laparoscopicas (CVL), no periodo de janeiro de 1998 a dezembro de 1999, em pacientes nao selecionados, de ambos os sexos, independentemente da presenca ou nao de sinais - clinicos, laboratoriais, ultra-sonograficos e outros metodos diagnosticos indicativos de coledocolitiase ou outra patologia de vias biliares. A CPO foi proposta em 250 casos, tendo sido realizada em 237 (94,6 por cento), e nao consumada em 13 casos (5,4 por cento). Foram encontradas 31 (l3 por cento) alteracoes, sendo as mais importantes 06 (2.5 por cento) casos de coiedocolitiase e 25 (lO,5 por cento) casos de anomalias anatomicas. A CPO, durante a CVL, mostrou-se um procedimento seguro, sem complicacoes relacionadas ao exame, definindo a anatomia, prevenindo as lesoes biliares e permitindo a deteccao de coledocolitiase insuspeitaBV UNIFESP: Teses e dissertaçõe
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