1,720,985 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
sj-pdf-1-prf-10.1177_02676591211031468 – Supplemental material for Establishment of a venovenous extracorporeal membrane oxygenation in a rat model of acute respiratory distress syndrome
No full textSupplemental material, sj-pdf-1-prf-10.1177_02676591211031468 for Establishment of a venovenous extracorporeal membrane oxygenation in a rat model of acute respiratory distress syndrome by Yongnan Li, Jian Huang, Rongzhi Zhang, Shixiong Wang, Xingdong Cheng, Pengbin Zhang, Kerong Zhai, Wei Wang, Debin Liu and Bingren Gao in Perfusion</p
Correção de referência de relógio para fluxo de transporte MPEG-2 em FPGA
Get PDFDissertação (mestado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2014O Fluxo de Transporte (Transport Stream - TS) MPEG-2 é um formato amplamente utilizado em sistemas de TV Digital para a transmissão de áudio, vídeo e informações relacionadas a programa. Entre outras informações, um fluxo de transporte carrega uma referência de tempo, conhecida como Referência de Relógio de Programa (Program Clock Reference - PCR), a qual é um retrato do relógio de 27 MHz do sistema. Esta informação permite a recuperação do relógio nos receptores, o qual garante a correta apresentação do conteúdo e até mesmo controla interfaces de saída. Porém, se o tempo de chegada dos pacotes de transporte variar durante a transmissão ou o processamento, tal cenário pode levar a erros no relógio do sistema, o que é conhecido como jitter. Os métodos tradicionais para a correção da informação do relógio de programa normalmente são baseadas em contadores/acumuladores de 27MHz com ponto flutuante, porém, não mitigam o jitter de PCR completamente. Métodos mais recentes usam contador/acumulador controlado por semáforo, e até mesmo propõem um esquema de adaptação de taxa integrada à correção da referência de relógio, a qual resulta em baixos níveis de jitter na saída. Além disto, não há estudos a respeito da implementação dos métodos controlados por semáforo em processadores de fluxo de transporte. Com isto, o presente trabalho propõe uma metodologia para implementação em FPGA, utilizando linguagem de descrição de hardware. Os resultados obtidos validam o uso dos métodos controlados por semáforo e mostram que a estrutura proposta é efetiva, com o benefício de eliminar efeitos de metaestabilidade.Abstract: The MPEG-2 Transport Stream is a standard format commonly used in digital TV systems for conveying audio, video and program-related information. Among other data, a transport stream also encapsulates a timing reference, known as program clock reference, which is a snapshot of the 27 MHz system clock. This information allows clock recovery in receivers, which provides correct content presentation and even drives output interfaces. However, if the arrival time of transport packets change during transmission or processing, such a scenario may lead to system clock errors, which is known as jitter. Traditional methods for correcting the program clock reference information are normally based on 27 MHz counters/floating-point accumulators and do not completely mitigate jitter. More recent methods use a semaphore-controlled counter/accumulator and even propose a joint adaptation and clock reference correction, which result in low jitter levels at the output. Nevertheless, there is no study concerning the implementation of semaphore-controlled methods in transport stream processors. Given that, the present work proposes an implementation methodology for FPGA, using hardware description language. The related results validate the use of semaphore-controlled methods and show that the proposed structure is effective, with the benefit of avoiding metastability effects
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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