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현병근(Byung-Keun Hyun),정석재(Sug-Jae Jung),손연규(Yeon-Kyu Sonn),박찬원(Chan-Won Park),장용선(Young-Seon Zhang),송관철(Kwan-Cheol Song),김이현(Lee-Hyun Kim),최은영(Eun-Young Choi),홍석영(Suk-Young Hong),권순익(Sun-Ik Kwon),장병춘(B 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.5
산채류 주산단지인 강원 평창, 홍천, 횡성, 양구 등 4개 지역 53농가포장을 중심으로 실시한 세부정밀토양 조사 결과에 의해 밝혀진 토성, 배수등급, 유효토심, 지형, 경사, 자갈함량, 해발 등의 토양특성과 산채류 수량을 통하여 작물재배적지기준 설정방법인 최대저해인자법과 다변량분석법의 두 가지 방법을 비교분석하였다. 산채류재배지의 수량과 토양의 형태 및 물리적특성을 비교하여 보면 토성 (미사)식양질, 유효토심은 >100 cm, 경사는 2~15%, 지형은 곡간 및 선상지, 해발 500 m이상인 토양에서 수량이 가장 높았다. 토양특성과 산채류 수량에 미치는 기여도산출결과 경사 0.30, 해발 0.22,지형 0.13, 배수등급 0.09 등 순으로 나타났다. 강원도 홍천군을 대상으로 최대저해인자법을 이용하여 산채류재배적지기준을 적용한 결과 최적지 0.2%, 적지 15.0%, 가능지 16.7% 그리고 저위생산지 68.0%로 나타났다. 그러나, 다변량분석법을 이용하여 산채류재배적지기준을 적용한 결과 최적지 35.1%, 적지 30.7%, 가능지 10.3%, 저위생산지 23.9%로 나타나 두 방법간에 많은 차이가 있었다. 따라서, 작물재배적지기준을 설정할 때 분석방법을 충분히 고려하여 기준을 설정할 필요가 있고, 앞으로 작물재배적지기준설정시 다변량 분석에 의한 방법을 적극 활용하는 것이 좋을 것으로 판단된다. The objective of this study was analysis of two methods of land suitability classification for wild edible green. One method was Maximum limiting factor method (MLFM) and the other was Multi-regression method (MRM) for land suitability classification for wild edible green. The investigation was carried out in Pyeongchang, Hongcheong, Hoeingseong, and Yanggu regions in Korea. The obtained results showed that factors related to the decision classification of the land suitability for wild edible green cultivation were land slope, altitude, soil morphology and gravel contents so on. The classification of the best suitability soil for wild edible greens were fine loamy (silty), valley or fan of soil morphology, well drainage class, B-slope (2~7%), available soil depth deeper than 100cm, and altitude higher than 501m. Contribution of soil that influence to crop yields using Multi-regression method were slope 0.30, altitude 0.22, soil morphology 0.13, drainage classes 0.09, available soil depth 0.07, and soil texture 0.01 orders. Using MLFM, area of best suitable land was 0.2%, suitable soil 15.0%, possible soil 16.7%, and low productive soil 68.0% in Hongcheon region of Gangwon province. But, area of best suitable land was 35.1%, suitable soil 30.7%, possible soil 10.3%, and low productive soil 23.9% by MRM. There was big difference of suitable soil area between two methods (MLFM and MRM). When decision classificatin of the land suitability for wild edible green cultivation should consider enough analysis methods. Furthermore, to establishment of land suitability classification for crop would be better use MRM than MLFM.
원형휜-원형관 열교환기의 휜효율 이론에 관한 수치적 검증
강희찬(H.C. Kang),임복빈(B.B. Lim),이종휘(J.W. Lee),장병춘(B.C. Chang),안서욱(S.W. Ahn) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
The purpose of the present study is to investigate the convective heat transfer characteristics and the validity of fin efficiency of the circular finned-tube heat exchanger by using commercial CFD code. The heat transfer coefficient obtained by using the laminar model was 22% overestimated to the experimental data. The fin surface temperature compared with the experimental data measured by the liquid crystal method. The fin efficiency by the present numerical experiment, defined as normalized and averaged fin surface temperature, was greater than the theoretical fin efficiency and the difference is increased at high value of the factor m.
The Study on Soil Classification in Sri Lanka
현병근,R. B. Mapa,손연규,조현준,신국식,최정원,정석재,장병춘 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.3
Land information is important for the international agricultural companies. This study investigated the agriculture and soil information in Sri Lanka. This study is the results from investigation of soil properties and agricultural properties determined by the Soil Taxonomy classification system for the soils in Sri Lanka. The order of the main agricultural imports in Sri Lanka was wheat > refined Sugar > dry Onion > Rice > Lentils. The climate of Sri Lanka is divided into three climatic zones. There are a wet zone, an intermediate zone, and a dry zone. Rainfall of the wet zone was 3,000-5,000mm year -1 . The rainfall of the dry zone was less than 1,000m -1 . The intermediate zone was in the middle area. Soil series of Sri Lanka were 109 in total. Detailed information of soil series was: 6 of soil Orders, 15 of Suborders, 39 of Great groups, and 56 of Subgroups. Soil texture of topsoil was much more coarse, but subsoil was gravelly coarse soil. Soil of Sri Lanka was classified as a Soil Order. The orders were Entisols > Alfisols > Ultisols > Inceptisols > Histosols > Vertisols.
유한요소해석을 이용한 핫스탬핑 공정의 성형성 및 상변태 해석
구광모(K. M. Ku),장병춘(B. C. Chang),임은수(E. S. Lim),오유리(Y. R. Oh),양동욱(D. U. Yang) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
The center pillar that has great effect on safety during side impact for car is required mechanical properties. Therefore, hot stamping process is used to manufacture high strength center pillar. It performs press forming and quenching at the same time. This method increases the productivity and obtains the high strength part. The cold working using high strength steel was difficult to form because of spring back defect, but formability of hot stamping in hot working is excellent. In this study, Finite element analysis was performed to reduce the cost of securing the process condition. It is analyzed as part of formability, temperature distribution by quenching and phase transformation using by AutoForm program and die design is optimized after design of hot stamping press die.