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강성은 ( Sungeun Kang ),신혜선 ( Hye-sun Shin ),이수정 ( Su Jung Lee ),구선영 ( Sun Young Gu ),이소은 ( So Eun Lee ),박채영 ( Chae Young Park ),이정미 ( Jung Mi Lee ),장귀현 ( Gui-hyun Jang ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-
본 연구는 신규 기준 설정 농약인 이마제타피르(Imazethapyr)의 일일섭취허용량(ADI)과 급성독성참고량(ARfD) 설정을 위해 수행하였다. 이마제타피르는 제초제로서 식물에서 가지사슬 아미노산 합성에 관여하는 효소인 acetohydroxyacid synthase를 억제하는 작용기전을 가진 것으로 알려져 있다. 국내의 경우, 잔류허용기준이 설정되어 있지 않으나, 제외국의 경우, CODEX는 쌀 등 17품목에 0.01∼1.5 mg/kg, 일본은 쌀 등 164품목에 0.05∼0.2 mg/kg, 미국은 쌀 등 22품목에 0.1∼5.5 mg/kg으로 설정되어 있다. 이마제타피르는 빠르게 흡수되고 제거되었으며, 장기 및 조직에 축적되는 잔류량은 매우 낮았다. 모화합물의 주요 배설 경로는 신장을 통한 소변 배설이었다. 체내에서 대사는 매우 약하게 일어났으며 주요 대사체는 OH-이마제타피르이었다. 단회투여독성시험의 경우, 랫드에 경구, 피부 및 흡입 노출 시 낮은 독성이 나타났으며 안점막 및 피부 자극성, 피부감작성이 없었다. 반복투여독성시험의 경우, 랫드와 개를 대상으로 한 경구독성시험에서 최고투여 용량까지 유해영향이 확인되지 않았다. 생식 및 발생독성, 유전독성, 발암성은 없는 것으로 판단하였다. 독성자료 검토 결과, 랫드를 대상으로 2년 발암성시험에서 체중 감소를 근거로 도출된 최대 무독성용량(NOAEL) 54.6 mg/kg bw/day에 안전계수 100을 적용하여 일일섭취허용량(ADI)을 0.5mg/kg bw/day로 설정하였다. 또한, 랫드를 대상으로 한 단회투여독성시험에서 이마제타피르 및 대사체의 LD50는 각 2,000-5,000 mg/kg bw로 급성독성참고량(ARfD) 설정은 불필요한 것으로 판단하였다.
An Energy Combiner for a Multi-Input Energy-Harvesting System
Taewook Kang,Sungeun Kim,Changhee Hyoung,Sungweon Kang,Kyunghwan Park IEEE 2015 IEEE Transactions on Circuits and Systems II: Expr Vol. No.
<P>An energy combiner for delivering electrical energy harvested simultaneously from individual energy harvesters (EHs) to a single energy storage device such as a battery is presented. It is designed as a modular architecture to be handled as a subsystem and supports an arbitrary number of EHs, which can be connected to the energy combiner in a hot-pluggable form. With the adaptive connection flows of a novel control algorithm, the energy harvested from each EH can be transmitted to an energy storage device without interfering with each other. An evaluation system is implemented, including the energy combiner circuit fabricated in a 0.13-μm CMOS process. The experimental results show that the energy combiner, with a low power consumption of 1.55 μW, achieves a maximum energy-combining efficiency of up to 95% for three input sources.</P>
Sungeun Park,Hyo Min Park,Yoonmook Kang,Hae-Seok Lee,Donghwan Kim 한국물리학회 2016 Current Applied Physics Vol.16 No.9
The purpose of this work is to investigate a back surface field (BSF) at a number of wafer resistivities for industrial crystalline silicon solar cells. As indicated in this manuscript, doping a crucible-grown Czochralski (Cz)-Si ingot with Ga offers a sure way of eliminating light-induced degradation (LID) because LID is composed of B and O complex. However, the low segregation coefficient of Ga in Si causes a much wider resistivity variation in the Ga-doped Cz-Si ingot. This resistivity variation in a Cz-Si wafer at different locations varies the performance, as is already known. In the light of a B-doped wafer, we made wider resistivity in Si ingot; we investigated how resistivities affect the solar cell performance as a function of BSF quality.
CHEMICAL COMPOSITION OF THE COMPONENTS OF ECLIPSING BINARY STAR ZZ BOOTIS
Kang, Young-Woon,Yushchenko, Alexander,Hong, Kyengsoo,Kim, Sungeun,Yushchenko, Volodymyr American Institute of Physics 2012 The Astronomical journal Vol.144 No.2
<P>We investigated ZZ Boo using a high-resolution (R = 80,000) spectrum obtained at the BOES echelle spectrograph attached to a 1.8 m telescope at the Bohuynsan observatory in Korea. The atmospheric parameters of the components were found using the published photometrical observations and the abundance analysis of iron lines: the flux ratio of the components F<SUB>A</SUB>/F<SUB>B</SUB> = 1.12 ± 0.15, the effective temperatures of the components T<SUB>eff</SUB> = 6860 ± 20 K and 6930 ± 20 K, the surface gravities log g = 3.72 ± 0.10 and 3.84 ± 0.10, the metallicities [Fe/H] = –0.10 ± 0.08 and –0.03 ± 0.10, and the projected rotation velocities vsin i = 11.9 ± 0.4 km s<SUP>–1</SUP> and 19.3 ± 0.8 km s<SUP>–1</SUP> for the primary and secondary components, respectively. The pointed errors are the formal errors of the methods used; the systematic errors of the temperatures, gravities, metallicities, and projected rotational velocities can be as high as 250-300 K, 0.3 dex, 0.15 dex, and 4 km s<SUP>–1</SUP>, respectively. The abundances of 24 and 22 chemical elements were determined in the atmospheres of the components. The abundance pattern of the primary component shows the solar or slightly undersolar abundances of all elements. CNO abundances are close to solar values. The abundance pattern of this component resembles those of λ Boo type stars. The abundances of light elements, except oxygen, in the atmosphere of the secondary component are practically solar. The abundances of barium and two detected lanthanides are close to the solar values; the overabundance of oxygen is 0.9 dex. The abundances of two components are evidently different. The comparison of relative abundances with the condensation temperatures and second ionization potentials of the elements confirms the difference in abundance patterns and allows discussion of the different accretion scenarios for two components of this binary system.</P>
최성은(Sungeun Choi),정재우(Jaewoo Chung),강정호(Jungho Kang),김남호(Namho Kim),진영욱(Youngwook Chin) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, the DME(Dimethyl Ether) that is attracting attention as a diesel alternative fuel should be required to change and optimally match a fuel system for application to engine. However, it was not proposed of the setting for a injection duration and a injection pressure because of the difference of conventional diesel engine with the physical property. Therefore this study was to propose the optimal application plan of the DME fuel system when applying the diesel engine based on the property of fuel system and compression ignition combustion of DME. To conduct it, plans to functionalize the performance of fuel pump, injector and the setting of injection timing and to extract required performance of fuel system within the limited injection condition through their connection and calculation, were suggested. This calculation process helped to establish the relationship between injector performance and required injection pressure, and it is expected that it would be possible to develop performance of each component using this relationship.
Park, Sungeun,Park, Hyomin,Kang, Yoonmook,Lee, Hae-Seok,Kim, Donghwan Elsevier 2016 CURRENT APPLIED PHYSICS Vol.16 No.9
<P>The purpose of this work is to investigate a back surface field (BSF) at a number of wafer resistivities for industrial crystalline silicon solar cells. As indicated in this manuscript, doping a crucible-grown Czochralski (Cz)-Si ingot with Ga offers a sure way of eliminating light-induced degradation (LID) because LID is composed of B and O complex. However, the low segregation coefficient of Ga in Si causes a much wider resistivity variation in the Ga-doped Cz-Si ingot. This resistivity variation in a Cz-Si wafer at different locations varies the performance, as is already known. In the light of a B-doped wafer, we made wider resistivity in Si ingot; we investigated how resistivities affect the solar cell performance as a function of BSF quality. (C) 2016 Elsevier B.V. All rights reserved.</P>
Joohyang Kang,Sungeun You 위기관리 이론과 실천 2017 Crisisonomy Vol.13 No.5
재난위기대응은 전문가 개인의 수준이 아닌 조직 차원에서 이루어져야 하고 효율적인 재난위기대응을 위해서는 팀의 효율성 증진이 중요하다. 팀 평가 및 진단 척도(Team Assessment and Diagnostic Instrument, TADI)는 효율적인 팀 과제 수행을 위해 필요한 팀 내 의사소통 및 정보 공유 정도를 측정하기 위해 개발된 척도이다. 본 연구에서는 효율적인 팀 단위의 활동이 요구되는 재난위기대응팀을 대상으로 팀 평가 및 진단 척도(TADI)를 타당화하고 단축형을 제안하였다. 연구결과 팀 평가 및 진단 척도(TADI)의 신뢰도와 타당도는 모두 적합하였고, 요인분석 결과 단일요인이 추출되었다. 본 연구에서는 요인분석 결과를 바탕으로 10문항으로 구성된 단축형 척도를 제안하였다. 연구결과, 단축형 척도는 총 42문항으로 구성된 전체 척도와 유사한 수준의 신뢰도와 타당도를 보였다. 본 연구의 결과는 팀 평가 및 진단 척도(TADI)가 재난위기대응팀의 효율적인 수행을 위한 팀 역량을 평가하는 신뢰롭고 타당한 도구로 사용될 수 있음을 보여준다. Disaster and crisis responses must be approached at the organizational level, not at the individual level, and thus promoting team effectiveness is critical in disaster management. The Team Assessment and Diagnostic Instrument (TADI) measures team characteristics associated with team effectiveness such as information sharing and effective communication. The purpose of this study was to validate the Korean version of TADI for a sample of disaster response teams and develop a brief form. Factor analysis revealed a single factor for the 42-item TADI which had good reliability and validity. A brief version of TADI, which was developed based on the results of the factor analysis, consisted of only 10 items but its reliability and validity were as comparable as the full version. The findings of the study indicated that both the full and brief versions of the Team Assessment and Diagnostic Instrument (TADI) are valid and reliable instruments for disaster response team assessment in Korea.