http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Negative Thermal Expansion Coefficient of Graphene Measured by Raman Spectroscopy
Yoon, Duhee,Son, Young-Woo,Cheong, Hyeonsik American Chemical Society 2011 NANO LETTERS Vol.11 No.8
<P>The thermal expansion coefficient (TEC) of single-layer graphene is estimated with temperature-dependent Raman spectroscopy in the temperature range between 200 and 400 K. It is found to be strongly dependent on temperature but remains negative in the whole temperature range with a room temperature value of (−8.0 ± 0.7) × 10<SUP>–6</SUP> K<SUP>–1</SUP>. The strain caused by the TEC mismatch between graphene and the substrate plays a crucial role in determining the physical properties of graphene, and hence its effect must be accounted for in the interpretation of experimental data taken at cryogenic or elevated temperatures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-8/nl201488g/production/images/medium/nl-2011-01488g_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl201488g'>ACS Electronic Supporting Info</A></P>
조두희 ( Duhee Jo ),김혜리 ( Hyeri Kim ),황정주 ( Jungju Hwang ),김미희 ( Mihui Kim ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.1
기숙사와 같이 여러 사람이 세탁기를 공유하는 상황에서 세탁상황을 알 수 없어 세탁물을 가지고 세탁실에 갔다가 모든 세탁기가 사용 중인 상황이 많이 발생하여 학생들의 불편함이 크다. 이에 본 논문에서는 기존 세탁기를 그대로 사용하고 사물인터넷 기술이 적용된 스마트플러그를 개발하여 서버와 통신하게 하고, EBS(Efficient Book System) 세탁기앱을 통해 세탁상황을 원격에서 알 수 있고, 예약 할 수 있으며, 세탁시간을 추천해 하는 시스템을 개발한다. 실제 기숙사 세탁실 세탁기에 적용하여 테스트했으며, 실현 가능성을 보였다.
Bang, Duhee,Tereshko, Valentina,Kossiakoff, Anthony A.,Kent, Stephen B. H. Royal Society of Chemistry 2009 Molecular bioSystems Vol.5 No.7
<P>We have used total chemical synthesis to prepare [V15A]crambin-α-carboxamide, a unique protein analogue that eliminates a salt bridge between the δ-guanidinium of the Arg<SUP>10</SUP> side chain and the α-carboxylate of Asn<SUP>46</SUP> at the C-terminus of the polypeptide chain. This salt bridge is thought to be important for the folding and stability of the crambin protein molecule. Folding, with concomitant disulfide bond formation, of the fully reduced [V15A]crambin-α-carboxamide polypeptide was less efficient than folding/disulfide formation for the [V15A]crambin polypeptide under a standard set of conditions. To probe the origin of this less efficient folding/disulfide bond formation, we separately crystallized purified synthetic [V15A]crambin-α-carboxamide and chemically synthesized [V15A]crambin and solved their X-ray structures. The crystal structure of [V15A]crambin-α-carboxamide showed that elimination of the Arg<SUP>10</SUP>–Asn<SUP>46</SUP> salt bridge caused disorder of the C-terminal region of the polypeptide chain and affected the overall ‘tightness’ of the structure of the protein molecule. These studies, enabled by chemical protein synthesis, strongly suggest that in native crambin the Arg<SUP>10</SUP>–Asn<SUP>46</SUP> salt bridge contributes to efficient formation of correct disulfide bonds and also to the well-ordered structure of the protein molecule.</P> <P>Graphic Abstract</P><P>The salt bridge between the side chain guanidinium of Arg<SUP>10</SUP> and the α-carboxylate of Asn<SUP>46</SUP> at the C-terminal of crambin’s polypeptide chain has been disrupted by total chemical synthesis of crambin-α-carboxamide, with dramatic effects on folding and flexibility of the protein molecule. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b903610e'> </P>
Rate-dependent soil behavior in seismic site response analysis
Park, Duhee,Hashash, Youssef M.A. Canadian Science Publishing 2008 Canadian geotechnical journal: Revue canadienne de Vol.45 No.4
<P> One-dimensional site response analysis is widely used in estimating local seismic site effects. The soil behavior in the analysis is often assumed to be independent of the rate of seismic loading. Laboratory test results, on the other hand, indicate that cyclic cohesive soil behavior is influenced by the rate of loading. Three models of rate-dependent dynamic soil behavior were derived based on available laboratory data. The models were implemented and evaluated in a modified one-dimensional equivalent linear site response analysis approach. Results show that rate-dependent shear modulus and damping can have a pronounced influence on propagated weak ground motion but a secondary influence on propagated strong motion. Rate dependence of the damping ratio has a greater impact on the computed response than rate dependence of the shear modulus. This paper highlights the relevance of the compatibility between frequencies at which dynamic soil properties are measured and their use in site response analysis. </P>