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홍석영(Suk Young Hong),민병걸(Byoung-Keol Min),이지민(Jee-Min Lee),김이현(Yihyun Kim),이경도(Kyungdo Lee) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.6
북한과 같이 접근이 힘들고 농업과 관련된 정보가 부족한 지역을 대상으로 RapidEye 위성영상의 판독 및 분류를 통하여 가장 기초적인 농업 현황과 생산 기반인 논 면적을 산정하였다. 291개의 RapidEye 영상을 이용하여 북한 전역을 대상으로 시기별로 논을 분류하기 위한 영상 판독 기준을 설정하였다. 5월 초에서 6월 말은 벼 이앙을 위해 관개를 하기 때문에 벼 이앙 전후에 물의 특성이 위성영상에서 잘 관측되기 때문에 영상이 어둡게 보이는 점을 이용하여 논과 다른 토지이용을 구분한다. 주요 벼 생육시기인 7월 초부터 9월 말에는 RapidEye 영상을 5:3:2 밴드조합으로 하여 영상을 판독하면 벼논의 색상과 질감의 차이를 이용하여 밭작물, 초지, 산림으로부터 논을 분류한다. 9월 말부터 10월 말은 벼 수확을 한 후로 논에 식생이 없는 시기로써 5:3:2 밴드 조합에서 회색빛이 나는 경지 형태를 대상을 논으로 판독한다. 그 결과 북한 전역에 대한 논 분포지도를 작성하였고 시도 행정구역별로 논 면적을 살펴보았다. 대부분의 논은 평안남북도와 황해남도가 위치한 서해안 평야지대에 전체 논 면적의 66% 정도인 3,521 km2가 분포하였고 함경남북도, 강원도, 나선시와 같이 동해에 인접한 지역의 논 면적은 1,172 km2로 전체 논 면적의 약 20%를 차지하는 것으로 나타났다. RapidEye 영상을 이용하여 분류한 논 면적은 2001년 및 2010년 FAO/WFP 북한 보고서와 비교할 때 각각 1% 이내의 면적 편차를 나타내었다. RapidEye 위성영상을 이용한 북한의 논 분류 결과는 농경지 이용 면적의 산정과 변화, 벼 수량 추정을 위한 마스킹 (masking) 자료로 활용될 수 있는 기본 자료로 의미가 매우 큰 것으로 판단된다. 향후에는 밭에 대한 분류 지도를 구축하고 나아가 옥수수와 같은 주요 밭작물에 대한 판독 방법에 대해서도 연구할 필요가 있을 것으로 생각된다. Remotely sensed satellite images can be applied to monitor and obtain land surface information on inaccessible areas. We classified paddy field area in North Korea based on on-screen digitization with visual interpretation using 291 RapidEye satellite images covering the whole country. Criteria for paddy field classification based on RapidEye imagery acquired at different time of rice growth period was defined. Darker colored fields with regular shape in the images with false color composite from early May to late June were detected as rice fields. From early July to late September, it was hard to discriminate rice canopy from other type of vegetation including upland crops, grass, and forest in the image. Regular form of readjusted rice field in the plains and uniform texture when compared with surrounding vegetation. Paddy fields classified from RapidEye imagery were mapped and the areas were calculated by administrative district, province or city. Sixty six percent of paddy fields (3,521 ㎢) were distributed in the west coastal regions including Pyeongannam-do, Pyeonganbuk-do, and Hwanghaenam-do. The paddy field areas classified from RapidEye images showed less than 1% of difference from the paddy field areas of North Korea reported by FAO/WFP (Food and Agriculture Organization/World Food Programme).
이석영(Suk Young Lee),박성우(Seong Woo park),양현필(Hyun Pil Yang),구강(Gang Koo) 한국키틴키토산학회 1999 한국키틴키토산학회지 Vol.4 No.2
N/A The objective of this study is to investigate the effects of chitosan oligosaccharide(COS, 1,000 <Mw.<5,000) on nuclear maturation and fertilization in bovine immature oocytes that are matured in vitro in a serum-free medium. First, the effect according to different concentrations of COS (0.2, 0.4, 0.8, 1.0, 2.0 and 4.0 mg/ml) in oocytes maturation was investigated. COS showed distinctly stimulatory effect on proliferation of established bovine endometrial stromal cells. In vitro maturation rate of immature oocytes was increased by treatment of COS in a dose dependent manner. The concentration of COS which showed most highest maturation rate was 1.0 mg/ma, On the other hand, the interactive effects of COS and fetal calf serum(FCS) during oocytes maturation were examined. Nuclear maturation rates(Metaphase 11 %) of COS plus FCS treatments (80.5%) were significantly higher than those of 1mg/ml COS and 5% FCS alone treatment respectively(76.3 and 65.2%). These results suggest that COS assists nuclear maturation of bovine immature oocytes in vitro and it works on both zona pellucida and cumulus-cell. COS addition method in a serum-free maturation system would be useful for the analysis of the factors and mechanisms which regulate oocyte maturation.
이석영(Suk-young Lee),전충환(Chung-\han Jeon),장영준(Young-june Chang) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
The concept of this engine was created by Ko in 1996 year. Performance simulation for this engine is presented in this paper. The volume of chamber at eccentric shaft angle is evaluated by using geometric models of rotor and rotor housing. A thermodynamic model which includes the first law of thermodynamics, combustion and heat transfer from chamber contents to surroundings is employed. Three processes of gas compression, combustion and expansion are considered and the pressure, temperature and heat release at each shaft angle in each process are computed in this performance simulation. If this engine is manufactured, this performance simulation must be useful for optimal design of this engine with parametric study for various design parameters and operating conditions.<br/>
FIRE Code를 사용한 정적연소기의 메탄-공기 균질 혼합기 연소특성 연구
이석영(Suk-Young Lee),허강열(Kang-Yul Huh) 한국연소학회 2006 한국연소학회지 Vol.11 No.2
A constant volume combustion chamber was used to investigate the combustion characteristics of homogeneous charge of methane-air mixture under various initial pressure, equivalence ratio and ignition times. The constant volume combustion chamber(CVCC) mostly has been studied by the experiments of visualization until now. So it is needed the numerical analysis of fluid and combustion characteristics in chamber by the more detail simulation. In this paper, the numerical analysis is tried to approach basically the homogeneous charge combustion phenomena under the various conditions, and the combustion phenomena in chamber is numerically analyzed by the commercial FIRE code. As a results, the combustion phenomena which were mean temperature, OH radical and reaction rate in chamber were investigated and it showed that the smallest flame growth occurs for the lean state and the increase of initial charged pressure condition due to the reduced OH radical.