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AlGaAs / GaAs multiple - quantum well에 대한 상온에서의 photoreflectance 특성연구
김동렬(D. L. Kim),최현태(H. T. Choi),배인호(I. H. Bae),김말문(M. M. Kim),한병국(B. K. Han),우덕하(D. H. Woo),김선호(S. H. Kim),최상삼(S. S. Choi) 한국진공학회(ASCT) 1997 Applied Science and Convergence Technology Vol.6 No.2
MBE로 성장한 AlGaAs/GaAs multiple-quantum well(MQW)에 대하여 pump source를 He-Ne laser와 Ar laser를 사용하여 상온에서 PR(photoreflectance)측정을 수행한 결과 여러 subband transition peak을 관찰하였다. PR결과를 standard analytic line shape으로 fitting하여 n=1의 conduction band와 heavy hole 그리고 light hole transition peak인 C1-H1, C1-L1에 대한 energy값들을 얻었다. 또한 상온에서의 PL(photoluminescence)측정에서 C1-H1, C1-L1과 관련된 main peak와 shoulder를 관찰하였다. 이 값은 PR 측정값과 잘 일치함으로써 PL에서의 main peak와 shoulder가 C1-H1, C1-L1과 관련된 peak임을 확인할 수 있었다. 또한 envelope function approximation(EFA)을 이용하여 구한 이론값과 PR과 PL에서 측정된 실험값들을 비교하였다. PR spectra of MBE grown AlGaAs/GaAs MQW have been measured at room temperature using the He-Ne laser and the Ar laser as the pump source. We have observed various subband transition peaks and PR spectra were fitted to standard analytic line shape. Above that results, obtained us transition energy from n=1 conduction band to heavy hole(C1-H1) and to light hole(C1-L1) subband. Photoluminescence(PL) at room temperature showed main peak with a shoulder. Good agreement between PL and PR measured n=1 intersubband transition energies was confirmed that PL main peak with a shoulder is associated with the C1-H1, C1-L1 transition. Additionally, we have calculated the C1-H1 and C1-L1 intersubband energy within envelope function approximation(EFA).
김성결(Kim S.K),나종덕(Na J.D),정병호(Chung B.H),이강연(Lee G.Y),조금배(Cho G.B),백형래(Baek H.L) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
To use land of area that land price hike is less as is serious being population centralism of big city by economic growth maximum, high building is making much. However, existent vertical carrier system has application height difficult a lot of controversial points in the High building. Specially, method that depend on iron vessel weight of line a lot of weights occupy and can increase ratio that vertical carrier system occupies gross area of building as height of building is high lineally and increase to maximum 30%. I wish to apply linear induction motor that is not existent vertical carrier system to solve these problem and design carrier system.
김동락(D.L. Kim),양형석(H.S. Yang),이병섭(B.S. Lee),최연석(Y.S. Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We presented the thermal design results of a protomodel of space infrared cryogenic system (PSICS) at 2005 KSME spring conference. From the design results, we knew that the radiation heat load accounts for major part of the heat loads. In order to verify the design results, we measured the radiation heat load by using boil-off calorimetry method with liquid nitrogen. The experimental result is in good agreement with the calculation one. The experimental set-up and radiation heat load measurement result of PSICS will be presented.
미끄럼 방지 바닥 도료용 폴리프로필렌 수지의 화학적 분쇄에 관한 연구
김대인 ( D L Kim ),정화영 ( H Y Chung ),황석환 ( S H Hwang ),조익성 ( I S Cho ),윤경준 ( K J Youn ),조백수 ( B S Cho ),김광국 ( K K Kim ),윤강재 ( K J Yun ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.6
In this study, some experimental results of the peroxide-degradation process of polypropylene(PP) in a co-rotating twin-screw extruder to produce controlled rheology polypropylene(CRPP) are presented. The peroxide was dicumyl peroxide(DCP) and the concentration of DCP was in the range 0-0.3wt%. It was found that the rheological properties of PP change significantly during reactive extrusion. Melt fiow index(MFI) increased with DCP concentration. Intrinsic viscosity decreases with increasing DCP concentration. From dynamic rheological data, number ave-rage molecular weight(Mn), weight average molecular weight(Mn) and molecular weight distribution(MWD) were cal-culated. Results indicated that Mw decreases and MWD becomes narrower with increasing peroxide concentration. Especially, particle size distribution of CRPP decreases with increasing DCP concentration by chemical powdering process, and anti-slip floor paint, CRPP(DCP 0.2 wt%) powder by 10phr was friction coefficient 2.15μ, abrasion resis-tance 511.18%.
강원도에서 토양과 기후 데이터베이스를 이용한 청보리의 재배 적지 구분
김경대 ( K D Kim ),성경일 ( K I Sung ),주진호 ( J H Joo ),김병완 ( B W Kim ),팽경륜 ( J L Peng ),이배훈 ( B H Lee ),잘일가세미네자드 ( J G Nejad ),조무환 ( M H Jo ),임영철 ( Y C Lim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2013 강원 농업생명환경연구 Vol.25 No.3
본 연구는 토양과 기후 데이터베이스를 이용하여 조사료 재배적지 기준 설정 연구의 일환으로 청보리를 대상으로 강원도에서의 재배가능지역을 추정하였다. 토양요인항목으로는 토양 물리성인 토성, 배수, 경사, 유효토심 및 암반노출, 토양화학성인 토양산도, 토양염류도 및 유기물함량을 선정하고 기준값 및 가중치를 설정하였다. 기후요인항목으로는 1월 일최저온도 평균, 3-5월의 평균온도, 9-12월의 5℃ 이상 일수, 10-5월의 강수일수와 강수량 그리고 3월에서 5월까지의 일조시간을 선정하고 기준값 및 가중치를 설정하였다. 토양요인의 관점에서 강원도에서 청보리의 재배가능지 및 재배최적지는 영동지방의 경우 고성, 속초, 양양, 강릉, 동해 및 삼척이며 주로 경사가 완만한 해안지역에 분포하고 있었다. 영서지방은 철원, 양구, 춘천, 원주, 횡성, 평창 및 정선에 주로 분포하고 있었다. 기후요인의 관점에서 강원도는 대부분이 50점이상이었으며, 재배가능지는 고성, 속초, 양양, 강릉, 동해 및 삼척의 해안지역과 철원, 양구, 춘천, 원주, 횡성, 평창 및 정선 일부 지역이 포함되었다. 이상의 결과로부터 강원도에서 토양과 기후요인을 고려한 청보리의 재배가능지 및 재배최적지는 영동지방의 고성, 속초, 양양, 강릉, 동해 및 삼척의 해안지역을 중심으로 가능하였고, 영서지방의 철원, 양구, 춘천, 원주, 횡성, 평창 및 정선 일부지역에서 재배가능지로 나타나고 있다. 향후 청보리의 재배적지 연구를 위해서는 일조시간에 대한 전자정보의 확보가 이루어진다면, 더욱 정밀한 청보리 재배 적지의 예상이 가능할 것으로 판단된다. As a part of establishing suitability classification for forage production, use of the national soil and climate database was attempted for Whole crop barley (Hordeum vulgare var. hexastichon (L.) Asch.) in Gangwon Province. The soil data base were from Heugtoram of the National Academy of Agricultural Science, and the climate data base were from the National Center for Agro-Meteorology, respectively. Soil physical properties including soil texture, drainage, slope available depth and surface rock contents, and soil chemical properties including soil acidity and salinity, organic matter content were selected as soil factors. The criteria and weighting factors of these elements were scored. Climate factors including average daily minimum temperature in January, average temperature from March to May, the number of days of which average temperature was higher than 5℃ from September to December, the number of days of precipitation and its amount from October to May of the following year, and sunshine hours from March to May were selected, and criteria and weighting factors were scored. The electronic maps were developed with these scores using the national data base of soil and climate. Based on soil scores, the area of Goseong, Sogcho, Yangyang, Gangreung, Donghea and Samcheog in east coastal region with gentle slope were classified as the possible and/or the proper area for Whole crop barley cultivation in Gangwon Province. The lands with gentle or moderate slope of Cheolwon, Yanggu, Chuncheon, Wonju, Hweongseong, Pyungchang and Jeongsun in west side slope of Taebaeg mountains were classified as the possible and/or proper area as well. Based on climate score, the east coastal area of Goseong, Sogcho, Yangyang, Gangreung and Samcheog could be classified as the possible or proper area. Most area located on west side of the Taebaeg mountains were classified as not suitable for Whole crop barley production. In scattered area in Cheolwon, Yanggu, Chuncheon, Wonju, Hweongseong, Pyungchang and Jeongsun, where the scores exceeded 50, the Whole crop barley cultivation should be carefully managed for good production. As a results, based on soil with climate the area of Goseong, Sogcho, Yangyang, Gangreung, Donghea and Samcheog in east coastal region with gentle slope and some area of Cheolwon, Yanggu, Chuncheon, Wonju, Hweongseong, Pyungchang and Jeongsun were classified as the possible and/or the proper area for Whole crop barley cultivation in Gangwon Province. For better application of electronic maps of whole crop barley, acurate study will be possible if a data comfirmed on th shine hours is achieved.