1,720,975 research outputs found
Development of Automobile Seat Comfort Estimation Models based on Polyurethane Foam
No full text22Nkc
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
Development of adiabatic demagnetization refrigerator (ADR) using passive heat switch
No full text학위논문(석사) - 한국과학기술원 : 기계공학과, 2019.2,[iv, 67 p. :]자기열량효과 (Magnetocaloric effect, MCE)는 외부 자기장의 변화에 따라 물질의 온도나 엔트로피가 변화하는 현상으로, 자성 물질로 불리는 일부 물질에서 크게 발현된다. 단열 탈자 냉동기 (Adiabatic Demagnetization Refrigerator, ADR)는 이러한 자기열량효과를 이용한 자기 냉동의 한 방식이다. 단열 탈자 냉동기는 자기장 변화를 제공하는 초전도 자석, 외부 자기장 변화에 따라 온도가 변화하는 자성 물질, 그리고 이 자성 물질의 온도에 따라 적절하게 고온부 또는 저온부와 자성물질을 열적으로 연결했다가 탈착하는 열스위치가 필요하다. 기존의 열스위치는 사이클 과정에 맞추어 적절히 ON/OFF 되도록 능동적인 제어가 필요하고, 따라서 시스템의 복잡성이 증가하게 된다. 본 연구에서는 자기장에 따라 열전도율이 변화하는 초전도체와 응축부 온도에 따라 열전달 능력이 변하는 열사이펀을 이용하여 수동적으로 작동하는 열스위치가 적용된 단열 탈자 냉동기를 개발하고자 한다. 초전도체는 순수한 납 와이어, 열사이펀 작동 유체는 헬륨을 사용하였다. 1차원 수치해석을 통한 예측모델을 개발하여 냉동기의 작동 가능성을 확인하였다. 이를 바탕으로 실험 장치를 제작하였고 냉동 사이클 실험을 수행하였다. 냉동기의 고온부는 2단 G-M 냉동기에 의해 6 K으로 유지 된다. 실험에서 사용된 고온 초전도 자석은 자성 물질에 0~3 T의 자기장 변화를 제공한다. 실험 결과 사이클의 일부 과정에서 열사이펀의 온도가 고온부 6 K 보다 낮은 4.4 K으로 유지가 되었고 이를 통해 열사이펀 내부에 있는 헬륨의 응축을 확인하였다. 본 연구는 단열 탈자 냉동기에서 고온부와 저온부의 열스위치가 모두 수동적으로 작동함으로써 시스템을 단순화시킨데 의의가 있다. 또한 고온부 온도를 4 K으로 더 낮출 수 있다면 저온부가 2 K으로 유지되어 초유체 (superfluid helium)의 액화가 가능할 것이다.한국과학기술원 :기계공학과
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
흡착식 냉동기가 통합된 1 K 이하 냉각용 단열 탈자 냉동기 개발
No full text학위논문(박사) - 한국과학기술원 : 기계공학과, 2025.2,[v, 121 p. :]The adiabatic demagnetization refrigerator (ADR) for sub-Kelvin cooling is developed with the integrated sorption cooler. The heat switches in the system are eliminated to simplify the whole refrigeration system, as a result. The whole refrigerator apparatus is composed of the high temperature superconducting (HTS) magnet to magnetize the single crystal Gadolinium Gallium Garnet (GGG), and the 4He sorption cooler. Both the sorption cooler and the magnet are cooled by a 4 K two-stage Gifford-McMahon cooler. The sorption cooler consists of a sorption pump filled with activated carbon and a gravitiy-assisted-4He thermosiphon. The GGG is utilized as the evaporator of the thermosiphon, enabling the integration of the sorption cooler and the ADR. The performance of the developed cooler is evaluated by a cycle operation. The sorption cooler precools the 4 T-magnetized GGG below 2 K by evaporating the liquid helium contained in the thermosiphon. When helium inside the thermosiphon is evacuated by the sorption pump, the magnetized GGG is thermally disconnected from the 4.2 K heat sink. Subsequently, the GGG is adiabatically demagnetized by discharging the HTS magnet and reaches the lowest temperature of 0.29 K. The maximum cooling capacity and the cooling power of the developed ADR at 0.8 K is estimated to be 1.35 J/cycle and 1.25 mW, respectively. The integrated cooler in this study successfully attains sub Kelvin temperature with relatively simple configuration and without using expensive 3He.한국과학기술원 :기계공학과
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