1,720,971 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
롤러블 디스플레이 구조 내 취성 층의 보호에 관한 연구
No full text학위논문(석사) - 한국과학기술원 : 기계공학과, 2018.2,[iii, 36 p. :]For the last decade, flexible OLED (Organic Light-Emitting-Diode) displays have been developed into the rollable display beyond bendable displays in order to achieve high space-usability and design-free forms. In addition, ITO (Indium Tin Oxide) film is used to an anode of the OLED because of excellent electrical properties. However, ITO anode lowers the mechanical reliability of the OLED display due to its brittleness and low elongation. Moreover, rollable displays have different boundary conditions such as the torsion spring for operation of rollable displays from conventional bendable displays. Despite the differences between conventional bendable and rollable displays, designs considering inherent characteristics of rollable displays have not been considered actively. In this study, deformation of the brittle electrode in the rollable OLED display structure is analyzed by finite element analysis. Design guidelines controlling the spring stiffness and modulus of elasticity of adhesive were suggested to protect the brittle electrode from mechanical fracture through this analysis. In addition, test equipment applied boundary conditions of actual rollable display is designed. Finite element analysis modeling for rollable display is also experimentally validated by using various elastic modulus of adhesives and ITO-coated PET films.한국과학기술원 :기계공학과
유연하고 신축성 있는 유기 반도체를 위한 공액 고분자 박막의 열기계 거동
No full text학위논문(박사) - 한국과학기술원 : 기계공학과, 2022.2,[v, 110 p. :]Conjugated polymers, which are semi-conductive organic materials have signature advantages such as light-weight, low-cost and solution-process ability compared to existing inorganic semiconducting materials. However, flexible and stretchable electronics consisted of conjugated polymer thin films have poor mechanical reliability (Cracking or delamination) due to severe mechanical deformations under bending and stretching. Recently, elongation at fracture of conjugated polymer thin films has been mainly quantified by using pseudo-freestanding tensile tests to solve the mechanical reliability issues. Nevertheless, flexible and stretchable semiconductor devices inevitably undergo temperature changes and thermal deformation during processing or operation. Thus, thermo-mechanical reliability problems such as thermal cracking and delamination occur due to coefficient of thermal expansion (CTE) mismatch between conjugated polymer thin films and adjacent layers. Therefore, quantification of CTE of conjugated polymer thin films is essential to improve thermo-mechanical reliability of flexible and stretchable semiconducting devices. However, “ellipsometry”, which is a conventional method for measuring CTE based on measuring polarization of reflected beam, has critical limitations to measure intrinsic thermo-mechanical behavior of thin films due to constraints of rigid substrates. In this study, film on water (FOW) method, which utilizes surface tension of water was used to measure intrinsic thermal deformation of conjugated polymer thin films in pseudo-freestanding state without effect of rigid substrates. By using this method, several studies were conducted focusing on quantitative CTE measurement for conjugated polymer thin films. First, thermal deformation of poly (3-hexylthiophene) (P3HT) thin film that has been widely studied as a representative conjugated polymer was measured by using water surface. Thermal shrinkage of as-cast P3HT thin films was observed, and it was confirmed that the thermal shrinkage was occurred due to a rearrangement and crystallization of unaligned polymer chains by fast-solidification in spin-coating. In addition, a method of preheating on liquid surfaces was introduced to measure the CTE of conjugated polymer thin films. Next, the measurable temperature range of thermal strain was extended up to 200 ℃ by using ionic liquid rather than water. Then the effect of crystallinity and confinement on CTE and melting point changes of conjugated polymer thin films was analyzed by controlling the regioregularity and concentration of P3HT polymers. Moreover, in order to investigate the relationship between CTE of the conjugated polymer thin films and thermo-mechanical reliability of stretchable semiconductors, CTE changes by molecular weight of n-type conjugated polymer thin films were investigated and the mechanism of thermo-mechanical problems (thermal cracking and wrinkling) in the stretchable devices were elucidated. Through this, it was confirmed that thermo-mechanical reliability of the stretchable device can be improved by using conjugated polymer with high molecular weight exceeding its critical molecular weight. Finally, design guidelines of acceptor type of polymer solar cells for stability of the solar cell were presented by comprehensively considering the photovoltaic, morphological, mechanical and thermo-mechanical properties of polymer blend thin films. The method demonstrated in this study for measuring CTE values of conjugated polymer thin films using liquid surfaces and analysis of thermo-mechanical behavior of flexible and stretchable organic semiconductors are expected to contribute to the commercialization of the flexible and stretchable devices with superior thermo-mechanical reliability and electrical performances.한국과학기술원 :기계공학과
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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