1,721,209 research outputs found
Towards ferrous medium-entropy alloys with low-cost and high-performance
No full textThis article introduces a practical and straightforward strategy to take a paradigm shift in the high-entropy alloys (HEAs) and medium-entropy alloys (MEAs) design concept from equiatomic alloys towards cost-effective ferrous medium-entropy alloys (FeMEAs). Upon deviating from the equiatomic composition in Fe-containing alloy system, we show that various FeMEAs can be developed by pseudo-binary methods. Further, we discuss an overview of the microstructural evolution and mechanical properties of recently-developed FeMEAs, which exhibit a broad spectrum of microstructures and mechanical properties. This viewpoint article highlights insights into the concept of FeMEAs, providing a potential direction for future development of HEAs and MEAs. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.11Nsciescopu
느린 커뮤니케이션을 위한 디자인: 쉬어가기 디자인을 통한 느린 소셜 미디어 커뮤니케이션
No full text학위논문(박사) - 한국과학기술원 : 산업디자인학과, 2015.2
,[x, 143 p. :]현대의 온라인 소셜 미디어들이 커뮤니케이션의 신속함과 간편함, 편리함이라는 ‘빠름’의 특성에 편향되어 발전되고 있는 경향이 있다. 이를 배경으로, 이 연구는 ‘느림의 철학(philosophy of slowness)’이 내포하는 소통을 통한 성찰의 가치, 그리고 경험의 다양성이라는 가치에 주목하여, ‘느림의 철학’을 소통의 영역에서 구현한 ‘느린 커뮤니케이션(slow communication)’의 가치와 느린 커뮤니케이션을 위한 디자인(design for slow communication)의 중요성에 대해 재고하였으며, 최종적으로 느린 커뮤니케이션을 염두에 둔 온라인 소셜 미디어의 디자인을 위한 ‘쉬어가기 디자인 (Pause moment Design)’과, 이를 중심으로 한 종합적 디자인 지식(comprehensive design knowledge)을 도출하는 것을 목표로 하였다.
‘쉬어가기 디자인’이란, 일종의 단순화된 인터렉션 방식을 묘사하는 디자인 개념의 한 종류로, 인터렉티브 시스템의 사용 과정에서 사용자가 일정 시간 동안 시스템 사용에 대한 몰입에서 한 걸음 물러나 자신의 내면이나 경험에 대해 성찰할 수 있는 시간을 마련해주는 인터렉션 디자인 전략을 뜻한다. 본 연구는 일반적인 상황에서 온라인 소셜 미디어의 사용자들이 능동적으로 커뮤니케이션의 속도를 조절하기 위해 활용하는 방식들을 실질적으로 관찰함으로써, 위와 같은 디자인 개념이 ‘느린 커뮤니케이션’을 구현하는데 필요한 디자인 개념이라고 확신하였다. 그리고 이 기초적인 디자인 개념에 기반하여, 본 연구는 디자인 사례의 반복적인 개발과 검증을 통해 발전된 ‘쉬어가기 디자인’의 개념과 더불어, ‘쉬어가기 디자인’을 위해 고려되어야 하는 디자인 고려사항, ‘쉬어가기 디자인’이 암시 혹은 내포하는 결과적인 영향에 대한 이해, 그리고 ‘느림의 철학’에 기반한 ‘느린 커뮨케이션’의 개념적 기반의 발전 등 다양한 스펙트럼에 걸친 디자인 관련 지식을 축적하고자 하였다...한국과학기술원 :산업디자인학과
Preparation and optical characterization of mesoporous silica films with different pore sizes
No full textMesoporous silica films with three different pore sizes were prepared by using cationic surfactant, non-ionic surfactant, or triblock copolymer as structure directing agents with tetramethylorthosilicate as silica source in order to control the pore size and wall thickness. They were synthesized by an evaporation-induced self-assembly process and spin-coated on Si wafer. Mesoporous silica films with three different pore sizes of 2.9, 4.6, and 6.6 nm and wall thickness ranging from similar to 1 to similar to 3 nm were prepared by using three different surfactants. These materials were optically transparent mesoporous silica films and crack free when thickness was less than 1 mu m. The photoluminescence spectra found in the visible range were peaked at higher energy for smaller pore and thinner wall sized materials, consistent with the quantum confinement effect within the nano-sized walls of the silica pores.J. Y. Bae acknowledges partial
support from Keimyung University Foundation Grant
(2006). S.-H. Choi acknowledges partial support from the
Korea Research Foundation Grant (KRF-2005-005-J00802).
This research has been supported by the Korea Science and
Engineering Foundation (KOSEF; Grant No. R01-2003-
000-10125-0) and the Brain Korea 21 project
THE EMOTIONAL QUALITY OF MUSICAL SOUND INTERFACE TO UNDERSTAND CONTEXTS
No full textMusical sound interfaces diverse in their tonality and pitch were employed to investigate the influence of emotions on contextual interpretation; two empirical studies using smartphone platform were conducted. The measured appropriateness of the interfaces for several purposes revealed the influence of emotions on the perception of context, with significant relation between the interfaces’ emotional qualities, which were rated in terms of pleasure and arousal, and perceived context represented by appropriateness. In addition, the contextual attributes of the interfaces measured by verbal estimation were shown to be correlated with the sounds’ pleasure and arousal. Throughout the studies the effect of emotional qualities on musical interfaces contextual attributes were verified, meanwhile the implementation of findings required further explorations
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
Formation and thermal-induced changes of mesostructures in fluorinated organosilicate films
No full textMesoporous fluorinated organosilicate films were synthesized from tetramethoxysilane and perfluoroalkylsilanes (RO)(3)Si-R' under acidic conditions in the presence of cationic surfactant or triblock copolymer by sol-gel spin-coating. The mesoporous fluorinated organosilicate films made from perfluoroalkylsilanes (PFASs) with long perfluoroalkyl chains, which acted as a template, displayed a hexagonal mesostructure with very low concentration of surfactants, regardless of the kind of surfactants. Although most of the surfactants and organic moieties were decomposed above 550 degrees C, the mesostructure of mesoporous fluorinated organosilicate films was maintained up to 650 degrees C. After calcination at 550 degrees C, their composition was similar to that of mesoporous silica films, and the cylindrical mesostructure was changed to less ordered and broken mesostructure when PFASs with long perfluoroalkyl chains were used. However, the cylindrical mesostructure was maintained when PFASs with short perfluoroalkyl chains were used. Therefore, PFASs with long perfluoroalkyl chains acted as a structure directing agent, and the chain length of PFASs affected the formation of mesostructure and thermal-induced mesostructural change. Also, the increase of calcination temperature caused the change of the composition, mesostructure, and optical property in the mesoporous fluorinated organosilicate films. (C) 2006 Elsevier Inc. All rights reserved.This work was supported by Grant No. R01-2003-000-
10125-0 from the Basic Research Program of the Korea
Science and Engineering Foundation and the Brain Korea
21 project
Superior strain-hardening by deformation-induced nano-HCP martensite in Fe-Mn-Si-C high-manganese steel
No full textWe propose that high strain-hardening in face-centered cubic (FCC) crystals containing interstitial atoms could be achieved through the formation of nanoscale hexagonal close-packed (HCP) martensite with severe lattice distortions. Our experimental results showed that carbon atoms could more effectively prevent the HCP martensite from thickening and result in the formation of nano-HCP martensite. This caused a higher strainhardening rate in FeMnSiC steel with heavy carbon than in FeMnSiCrNi steel with trace carbon though the HCP martensite transformation kinetics was almost the same in these two steels.11Nsciescopu
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
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