1,720,954 research outputs found
A study on measurement of micro weld deformation by using phase shifting ESPI
No full text학위논문(석사) - 한국과학기술원 : 기계공학전공, 2002.2, [ [ii], 63 p. ]미세 부품을 접합할 때 발생하는 미세 변형은 그 크기가 작을지라도 성능에 커다란 저하를 가져오는 경우가 많다. 따라서 이를 해결하기 위하여 미세 변형의 정밀한 측정이 필요하다. 레이저 간섭계는 비접촉, 비파괴식 측정방법으로 비교적 간단한 구성으로 정밀한 측정이 가능하다는 장점이 있다.
ESPI는 레이저 스패클 간섭계의 일종으로 면외변위의 정밀한 측정에 주로 이용된다. 이 때 광강도를 이용한 간섭무늬 해석의 경우 노이즈가 심하고 변형의 방향을 알 수 없다는 단점이 있다. 위상이동법을 적용하면 노이즈가 적은 선명한 영상을 얻을 수 있고, 변형의 크기와 방향을 알 수 있어서 정량적인 변형 측정이 가능하다. 얻어진 간섭무늬 형태는 위상정보의 왜곡없이 노이즈를 제거하기 위하여 위상이동 컨볼루션 방법을 이용하여 필터링하였다. 위상연속화는 위상 점프의 절대값이 π이상이 되는 점들을 찾아 연결하여 간섭무늬의 경계를 찾고 이로부터 오프셋 위상을 구하여 구현하였다.
면내변위는 레이저 스패클 상관법을 이용하여 측정하였다. 분해능을 향상시키기 위하여 푸리에 시리즈 전개를 이용한 연속상관함수를 이용하였다.한국과학기술원 : 기계공학전공
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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