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Tim Park 한국국제교육교류학회 2021 국제교류와 융합교육 Vol.1 No.1
코로나-19시대에서 대학의 국제교류도 예외 없이 종단되거나 새로운 방안을 요구하고 있다. 특히 대학교육에서 국제교류는 큰 비중을 차지하는 바, 학생들이 재학하는 기간 동안 코로나-19로 인해 피해를 받는 일을 최소화하여야 하는데 국제교류도 큰 영향을 받고 있는 현실이다. 이에 적극적으로 대응할 수 있는 미국하와이주립대의 국제교류 방안을 예시로 제안하며, 양국 대학의 교류에 도움이 되기를 희망한다. Due to Covid-19, international programs at the universities in the US have been temporarily on hold (or terminated). To recover from the great damage that the pandemic has brought to us, we have made our transition to provide international education via online. University of Hawaii – West Oahu has been actively coping with the impact from pandemic, and would like to propose unconventional methods of international programs to the fellow universities in Korea
Two-Dimensional Excitonic Photoluminescence in Graphene on a Cu Surface
Park, Youngsin,Kim, Yooseok,Myung, Chang Woo,Taylor, Robert Anthony,Chan, Christopher C. S.,Reid, Benjamin P. L.,Puchtler, Tim J.,Nicholas, Robin J.,Singh, Laishram Tomba,Lee, Geunsik,Hwang, Chan-Cuk American Chemical Society 2017 ACS NANO Vol.11 No.3
<P>Despite having outstanding electrical properties, graphene is unsuitable for optical devices because of its zero band gap. Here, we report two-dimensional excitonic photoluminescence (PL) from graphene grown on a Cu(111) surface, which shows an unexpected and remarkably sharp strong emission near 3.16 eV (full width at half-maximum <= 3 meV) and multiple emissions around 3.18 eV. As temperature increases, these emissions blue shift, displaying the characteristic negative thermal coefficient of graphene. The observed PL originates from the significantly suppressed dispersion of excited electrons, in graphene caused by hybridization of graphene pi and Cu d orbitals of the first and second Cu layers at a shifted saddle point 0.525(M+K) of the Brillouin zone. This finding provides a pathway to engineering optoelectronic graphene devices, while maintaining the outstanding electrical properties of graphene.</P>
PARK, SANG‐,HO,SIT, TIM L.,KIM, KOOK‐,HYUNG,LOMMEL, STEVEN A. Blackwell Publishing Ltd 2012 Molecular plant pathology Vol.13 No.7
<P><B>SUMMARY</B></P><P>The interaction between viral capsid protein (CP) and its cognate viral RNA modulates many steps in the virus infection cycle, such as replication, translation and assembly. The N‐terminal 50 amino acids of the <I>Red clover necrotic mosaic virus</I> (RCNMV) CP are rich in basic residues (especially lysine) and are essential for the core functions of the CP, namely RNA binding and virion assembly. To further elucidate additional biological roles for these basic residues, a series of alanine substitution mutations was introduced into infectious clones of RCNMV RNA‐1 and assayed for symptomatology, virion formation and systemic infection. Infectivity assays conducted in <I>Nicotiana benthamiana</I> revealed that all nine alanine substitution mutants (ASMs) were competent for systemic infection. Two ASMs (K4A and K7A/K8A) induced severe symptoms and delayed the systemic spread of viral genomes when compared with wild‐type RCNMV. However, these ASMs were still competent for virion formation. Three other ASMs (K25A, K33A and K38A) displayed milder symptoms and significant reductions in virion accumulation when compared with wild‐type RCNMV, but retained the ability to spread systemically. Evidence from these last three ASMs, as well as a CP null mutant, showed that RCNMV is able to move systemically in <I>N. benthamiana</I> as a nonvirion form. These observations reaffirm the necessity of the N‐terminal lysine‐rich residues of the RCNMV CP for efficient virion accumulation. They also reveal additional roles for the CP in the modulation of host symptomatology, independent of its role in virion assembly and the rate of systemic viral movement in <I>N. benthamiana</I>.</P>
Inverse modelling of CF4 and NF3 emissions in East Asia
Arnold, Tim,Manning, Alistair J.,Kim, Jooil,Li, Shanlan,Webster, Helen,Thomson, David,Mü,hle, Jens,Weiss, Ray F.,Park, Sunyoung,O&,apos,Doherty, Simon Copernicus GmbH 2018 Atmospheric Chemistry and Physics Vol.18 No.18
<P>Abstract. Decadal trends in the atmospheric abundances of carbon tetrafluoride (CF4) and nitrogen trifluoride (NF3) have been well characterised and have provided a time series of global total emissions. Information on locations of emissions contributing to the global total, however, is currently poor. We use a unique set of measurements between 2008 and 2015 from the Gosan station, Jeju Island, South Korea (part of the Advanced Global Atmospheric Gases Experiment network), together with an atmospheric transport model, to make spatially disaggregated emission estimates of these gases in East Asia. Due to the poor availability of good prior information for this study, our emission estimates are largely influenced by the atmospheric measurements. Notably, we are able to highlight emission hotspots of NF3 and CF4 in South Korea due to the measurement location. We calculate emissions of CF4 to be quite constant between the years 2008 and 2015 for both China and South Korea, with 2015 emissions calculated at 4.3±2.7 and 0.36±0.11 Gg yr−1, respectively. Emission estimates of NF3 from South Korea could be made with relatively small uncertainty at 0.6±0.07 Gg yr−1 in 2015, which equates to ∼1.6 % of the country's CO2 emissions. We also apply our method to calculate emissions of CHF3 (HFC-23) between 2008 and 2012, for which our results find good agreement with other studies and which helps support our choice in methodology for CF4 and NF3. </P>
남아프라카 지역내 한타바이러스 존재에 관한 혈청 역학적 증거
Lee, Pyung-Woo,Park, Man-Seong,Keen, G.Anthony,Noveljic, Z.,Tucker, Tim J.,Ryst, Elna van der,Viljoen, Johannes I.,Pretorius, Anne-Marie,Oelofsen, Mike 대한미생물학회 1999 Journal of Bacteriology and Virology Vol.29 No.1
Sero-epidemiologic survey has been carried out to establish serologically the presence of hantavirus in areas of South Africa. The survey was oriented to search natural infection in both of humans and wild rodents and involvement of human disease. The normal human sera were collected from the residents in urban and rural areas of Western Cape, and rural area of Eastern Cape province. The rodent sera came from various species of rodents trapped in Northern Cape and Western Free provinces. The patient sera were selected from the patients of renal failure, pulmonary syndrome and pyrexia of unknown origin (PUQ) according to diagnostic chart among the patients hospitalized in major hospitals of Cape Town area. The sera were screened and titrated by IFA test using antigens of Hantaan (HTN), Seoul (SEO), Puumala (PUU), and Prospect Hill (PH) viruses primarily. Positive cases were subjected to differential IFA test using HTN, PUU and PH antigens and plaque reduction neutralization test for further confirmation. Anti-hantavirus antibodies were detected from 2 of 352 rural, 1 of 172 urban residents of E. Cape, and 5 of 118 rural, 5 of 368 urban residents of W. Cape. The antibody was also demonstrated from 5 of 221 wild rodents, and it was appeared that 2 different species, Aethomys namaquensis and Tatem leucogaster, are involved. Among 318 patients tested, 3 who were diagnosed as chronic renal failure, acute respiratory distress syndrome (ARDS) and glomerulonephritis were proved to be positive. The reaction patterns obtained from all of these positive sera were distinct from hantaviral sero-patterns ever established. This result suggests that new viruses may exist in this area and play an possible etiologic role in human disease. The feature of serologic survey on anti-hantavirus antibody demonstrable newly from African wild rodents which are different from reservoir species in other continents elicits a conjecture that the virus may be different from known hantaviruses ever found. This fact also suggests that an expanded role in etiologic involvement with other unknown human diseases by newly emerging hantaviruses may be possible in this areas.