1,721,100 research outputs found
Analysis of fluid flow and heat transfer in a tube with spiral grooves
No full text학위논문(석사) - 한국과학기술원 : 기계공학전공, 2000.2, [ ix, 70 p. ]한국과학기술원 : 기계공학전공
Simple epidemic models with segmentation can be better than complex ones
No full textGiven a sequence of epidemic events, can a single epidemic model capture its dynamics during the entire period? How should we divide the sequence into segments to better capture the dynamics? Throughout human history, infectious diseases (e.g., the Black Death and COVID-19) have been serious threats. Consequently, understanding and forecasting the evolving patterns of epidemic events are critical for prevention and decision making. To this end, epidemic models based on ordinary differential equations (ODEs), which effectively describe dynamic systems in many fields, have been employed. However, a single epidemic model is not enough to capture long-term dynamics of epidemic events especially when the dynamics heavily depend on external factors (e.g., lockdown and the capability to perform tests). In this work, we demonstrate that properly dividing the event sequence regarding COVID-19 (specifically, the numbers of active cases, recoveries, and deaths) into multiple segments and fitting a simple epidemic model to each segment leads to a better fit with fewer parameters than fitting a complex model to the entire sequence. Moreover, we propose a methodology for balancing the number of segments and the complexity of epidemic models, based on the Minimum Description Length principle. Our methodology is (a) Automatic: not requiring any user-defined parameters, (b) Model-agnostic: applicable to any ODE-based epidemic models, and (c) Effective: effectively describing and forecasting the spread of COVID-19 in 70 countries.
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
A construção das imagens discursivas da personagem Yoon Se-Ri no K-Drama Pousando no amor
No full textThis research aims to analyze the discursive images of the character Yoon Se-ri in the K-drama Pousando no Amor available on the Netflix streaming platform. This analysis will be based on the concept of ethos by Ferreira (2015) and Mosca (2001), going through the construction of these ethos throughout the series. In addition, the assumptions by Amossy (2013) and Maingueneau (2013) regarding the pre-discursive ethos and stereotyping will be fundamental for the analysis concerning this work, since we previously built the image of this character based on what we already know about the culture Korean and the themes usually addressed in Asian dramas. This pre-construction was not met, at first, because the character was characterized as outside the traditionalist pattern due to her behavior shown in the first episode.
Another important aspect in this work is the observation of figures of speech assumed by Guimarães (1997) and Santana and Mariano (2013), making it possible to observe how these figures were used in our corpus.A presente pesquisa tem como objetivo analisar as imagens discursivas da personagem Yoon
Se-ri no K-drama Pousando no Amor, disponível na plataforma de streaming Netflix. Essa
análise terá como base o conceito de ethos de Ferreira (2015) e Mosca (2001), transcorrendo
pela construção desses ethos ao longo da série. Além disso, os pressupostos por Amossy (2013)
e Maingueneau (2013) a respeito do ethos pré-discursivo e estereotipagem, serão fundamentais
para a análise que concerne esse trabalho, visto que construímos a imagem previamente dessa
personagem baseado no que já conhecemos sobre a cultura coreana e as temáticas abordadas,
normalmente, nos doramas asiáticos. Essa pré-construção não foi atendida, de início, pois a
personagem era caracterizada como fora do padrão tradicionalista perante sua conduta
mostrada no primeiro episódio. Outro aspecto importante nesse trabalho é a observação das
figuras de discurso pressupostos por Guimarães (1997) e Santana e Mariano (2013), sendo
possível observar como se deu o uso dessas figuras em nosso corpus.Itabaian
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
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