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Synthetic anion transporters that bear a terminal ethynyl group
Lee, Eun-Bee,Ryu, Hyunil,Lee, Insu,Choi, Sangbaek,Hong, Jung-Ho,Kim, Sun Min,Jeon, Tae-Joon,Cho, Dong-Gyu The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.45
<P>Cl<SUP>−</SUP> transporters that bear a terminal ethynyl group were synthesized; they consist of non-pyrrolic hydrogen bond motifs such as phenolic OH, amide NH, and triazole CH. The ethynyl group of these non-pyrrolic analogs plays an important role in chloride efflux and they exhibit no significant cytotoxic activity.</P> <P>Graphic Abstract</P><P>Non-pyrrolic synthetic anion transporters without cytotoxicity are capable of transporting the chloride anion through membranes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc01903f'> </P>
Park, Sangbaek,Seo, Seung-Deok,Lee, Sangwook,Seo, Se Won,Park, Kyung-Soo,Lee, Chan Woo,Kim, Dong-Wan,Hong, Kug Sun American Chemical Society 2012 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.116 No.41
<P>High-quality, single-crystalline Sb-doped SnO<SUB>2</SUB> (ATO) nanobelts (NBs) surrounded by very thin and short TiO<SUB>2</SUB> rutile nanorods were synthesized by thermal evaporation followed by chemical bath deposition. An epitaxial relationship between ATO NBs and rutile-phase TiO<SUB>2</SUB> nanorods was clearly demonstrated on the basis of a crystallographic approach through high-resolution transmission electron microscopy analysis. Furthermore, the ATO@TiO<SUB>2</SUB> heteronanostructures as anodes for Li ion batteries showed enhanced cycling stability and superior rate capabilities. These improved electrochemical performances were attributed to beneficial geometrical, structural, and doping effects such as alleviation of volume expansion, epitaxial growth, and high electronic conductivity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-41/jp308077a/production/images/medium/jp-2012-08077a_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp308077a'>ACS Electronic Supporting Info</A></P>
낙하 액적 형상에 따른 미세관성입자 흡착률에 관한 퍼텐셜 유동해석
이종원(Jongwon Lee),김상백(Sangbaek Kim),이훈상(Hoonsang Lee),황원태(Wontae Hwang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
A quantitative investigation on particles scavenged by liquid droplets is crucial in understanding the removal of atmospheric aerosols and pollutants by means of natural and artificial precipitation. The deformed shapes of falling droplets and potential flow fields were numerically obtained to further solve the equation of motion of small inertial particles and simulate the impact with droplets. The calculated particle collection efficiency slightly increased with decreasing surface tension coefficient due to the change in shape of the droplet. However, the increase in volumetric diameter resulted in lower collection efficiency despite the deformation because of larger Stokes drag acting on the particle. Numerical results were collected to suggest a new model for estimating the collisions between particles and droplets, and evaluating the effect of droplet deformation on the collection efficiency.
라돈 노출 유효선량 평가를 위한 연간 평균 라돈 농도 예측모델 개발
이철민 ( Cheolmin Lee ),강대용 ( Daeyong Kang ),고상백 ( Sangbaek Koh ),조용석 ( Yongseog Cho ),이다정 ( Dajeong Lee ),이슬비 ( Sulbee Lee ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.8
This research, sponsored by the Korean Ministry of Environment in 2014, was the first epidemiological study in Korea that investigated the health impact assessment of radon exposure. Its purpose was to construct a model that calculated the annual mean cumulative radon exposure concentrations, so that reliable conclusions could be drawn from environment-control group research. Radon causes chronic lung cancer. Therefore, the long-term measurement of radon exposure concentration, over one year, is needed in order to develop a health impact assessment for radon. Hence, based on the seasonal correction model suggested by Pinel et al.(1995), a predictive model of annual mean radon concentration was developed using the year-long seasonal measurement data from the National Institute of Environmental Research, the Korea Institute of Nuclear Safety, the Hanyang University Outdoor Radon Concentration Observatory, and the results from a 3-month (one season) survey, which is the official test method for radon measurement designated by the Korean Ministry of Environment. In addition, a model for evaluating the effective annual dose for radon was developed, using dosimetric methods. The model took into account the predictive model for annual mean radon concentrations and the activity characteristics of the residents.
T/A-50 엔진 축마력(Horsepower) 능력 해석 및 비행시험 검증
이상효(Sang-Hyo Lee),이부일(BooIl Lee),정주현(JooHyun Jung),이상백(SangBaek Lee) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.7
항공기 엔진은 항공기가 각종 기동을 수행하도록 추력을 발생하는 것 외에 기동 수행을 위해 작동되는 조종면에 공급될 유압계통의 동력과 각종 항전장비 작동을 위한 전기 계통의 동력을 공급한다. 엔진으로부터 제공되는 동력은 엔진의 고압압축기로부터 추출되기 때문에 축마력(Horsepower Extraction, HPX)이라하며, 추출되어 제공되는 엔진 축마력이 유압계통과 전기계통에서 요구하는 요구 축마력보다 작게 되면 엔진에 과도한 부하가 걸려 엔진회전수 감소(Rollback) 및 심한 경우 실속(stall)등이 발생할 수 있다. T/A-50체계개발 동안 요구 축마력과 엔진의 공급 축마력에 대한 비교 해석을 수행하였고, 해석 결과 엔진 축마력이 요구 축마력보다 직은 것을 확인하였다. 엔진 축마력 증가를 위한 엔진제어 스케쥴 변경이 수행되었으며, 변경된 제어 스케쥴이 장착된 엔진을 이용하여 T/A-50비행시험을 수행하였다. 비행시험 결과를 통해 해석 결과 및 변경된 제어 스케쥴의 타당성을 검증하였다. The aircraft engine is to generate thrust for the maneuver of aircraft and to provide the power to the related hydraulic system and electrical system. Since the power provided to the systems is extracted from the high pressure compressor of aircraft engine, the extracted power is called horsepower extraction (HPX). If the HPX provided from the engine is smaller than the HPX required from the related systems, there could be abnormal engine behavior, like engine rollback or stall. Analysis on comparing the required HPX and the engine HPX capability had been performed during the T/A-50 FSD (Full Scale Development) period. The analysis results make the engine schedule changed, and T/A-50 flight test has been performed with the changed engine schedule. The analysis results and changing the engine control schedule were verified to be valid with the flight test results.
Transparent-conducting-oxide nanowire arrays for efficient photoelectrochemical energy conversion.
Lee, Sangwook,Park, Sangbaek,Han, Gill Sang,Kim, Dong Hoe,Noh, Jun Hong,Cho, In Sun,Jung, Hyun Suk,Hong, Kug Sun RSC Pub 2014 Nanoscale Vol.6 No.15
<P>We report one dimensional (1-D) transparent-conducting-oxide arrays coated with light-absorbing semiconductors to simultaneously maximize light harvesting and charge collection in a photoelectrochemical (PEC) system. Tin-doped indium oxide (ITO) nanowire (NW) arrays are prepared on ITO thin-film substrates as the transparent-conducting-oxide, and TiO2 or CdSe/CdS/TiO2 thin layers were coated on the ITO NW arrays as the solar light-absorbing layers. The optimal PEC performance, 0.85% under 100 mW cm(-2) of light illumination, is obtained from 30 μm-long ITO NW, which is covered with 20 nm-thick TiO2 nanoshell. We finally demonstrate that the ITO NW-based photoelectrode is also compatible with one of the most efficient visible-light sensitizers, the CdS/CdSe quantum dot. Our approach using the transparent conducting 1-D array has wide potential to improve the PEC performances of conventional semiconducting materials through liberation from the poor charge transport.</P>