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조동현,이종선,Cho, Dong-Hyun,Lee, Jong-Sun The Korean Society of Manufacturing Process Engine 2017 한국기계가공학회지 Vol.16 No.4
In the present study, we used a loop thermosyphon heat exchanger consisting of condensers with internal fins and external plate fins which are 480 mm wide, 68 mm long, and 1,000 mm high. The heat transfer pipes in the heat exchanger were 15 mm in diameter and 1,000 mm in length, and 98 heat transfer pipes were installed in the heat exchanger. According to the experimental results, as the spaces between the internal discontinuous pins decreased, the frequency of pressure drops increased and changes in temperature at the outlet of the condenser were shown to be a little smaller. Therefore, we can see that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased. For the loop heat pipe heat exchanger consisting of a condenser with internal and plate fins, as the temperature of the air flowing into the condenser increased, the condensation heat transfer rate also increased, and as the condenser refrigerant inflow temperature increased, the condensation heat transfer rate increased as well.
조동현,유일상,Cho, Dong Hyun,Yoo, Il Sang 한국시스템엔지니어링학회 2016 시스템엔지니어링학술지 Vol.12 No.2
Many countries concentrated on the space developments to enhance the national security and the people's quality of life. A space launch vehicle for accessing the space is a typical large complex system that is composed of the high-technology like high-performance, high-reliability, superhigh-pressure, etc. The project developing large complex system like space launcher is mostly conducted in the uncertain environment. To achieve a goal of the project, its success probability should be enhanced consistently by reducing its uncertainty during the life cycle: it's possible to reduce the project's uncertainty by performing the risk management (RM) that is a method for identifying and tracing potential risk factors in order to eliminate the risks of the project. In this paper, we introduce the risk management (RM) process applied for a Space Launch Vehicle R&D Project.
광섬유 방사선량계를 이용한 선량보강 영역에서의 심부선량 백분율과 피부 선량률 측정
조동현,장경원,유욱재,서정기,허지연,이봉수,조영호,Cho, Dong-Hyun,Jang, Kyoung-Won,Yoo, Wook-Jae,Seo, Jeong-Ki,Heo, Ji-Yeon,Lee, Bong-Soo,Cho, Young-Ho 한국광학회 2010 한국광학회지 Vol.21 No.1
본 연구에서는 고 에너지 광자선을 조사 할 때, 선량보강 영영에서의 피부 선량률을 측정을 위해 유기 섬광체와 플라스틱 광섬유를 사용한 광섬유 방사선량계를 제작하였다. 광섬유 방사선량계의 센서부에서 발생된 섬광빛은 30 m 길이의 광섬유를 통해 전달되어 광증배관과 전류계로 측정된다. 광섬유 방사선량계로 측정한 선량보강 영역에서의 피부 선량률은 이온 전리함 및 GAFCHROMIC EBT 필름의 측정 결과와 비교 및 분석 하였다. In this study, we have fabricated a fiber-optic dosimeter using an organic scintillator and a plastic optical fiber. The dosimeter measure skin dose and percentage depth dose in a build-up region for an incident high energy photon beam. The scintillating light generated in the organic sensor probe embedded in a solid water phantom is guided by 30 m plastic optical fiber to a light-measuring device such as a PMT or an electrometer. In addition, using a fiber-optic dosimeter or a GAFCHROMIC EBT film, skin dose and percentage depth dose in the build-up region are measured and compared.
담수 이매패의 진주층 형성 - ( Ⅱ. Extrapallial fluid 의 SDS 전기 영동 ) -
조동현,권오길,박성빈 ( Dong Hyun Cho,Oh Kil Kwon,Sung Bin Park ) 한국하천호수학회 1985 생태와 환경 Vol.18 No.3·4
The extrapallial fluid of two species of freshwater bivalves is studied for protein fractions. SDS-slab gel electrophoresis reveals the presence of at least 27 protein components. The insoluble matrices from the shells of Corbicula fluminea and Lanceolaria acrorhyncha are not solubilized by the method for solubilization of the avian feather keratin.
담수산 (淡水産) 이매패 (二枚貝) , 재첩의 전기영동 및 면역학적 분석
조동현,권오길,박성빈 ( Dong Hyun Cho,Oh Kil Kwon,Sung Bin Park ) 한국하천호수학회 1983 생태와 환경 Vol.16 No.3·4
Components of extrapallial fluid of Corbicula fluminea and Corrbicula sp. are comparatively examined by electrophoretic and immunochemical methods. It has been found that the proteins in extrapallial fluid of two species have some differences electrophoretically but homology immunochemicaly, In case of esterase there are some differences in activity, therefore it is suggested physiological difference in two species.
우주파편 충돌위험 종합관리 시스템의 레이더 관측 데이터 처리 결과 비교 분석
조동현(Dong-Hyun Cho),김해동(Hae-Dong Kim),이상철(Sang-Cherl Lee) 한국항공우주연구원 2013 항공우주기술 Vol.12 No.2
우주파편의 지속적인 증가로 인해 우주파편으로부터 자국의 위성을 보호하기 위한 시스템이 등장하게 되었다. 이에 한국항공우주연구원에서도 자국의 운영위성의 보호를 위해 우주파편에 의한 충돌위험 종합관리시스템을 개발 중에 있다. 이러한 충돌위험 종합관리시스템은 자국의 위성에 대한 충돌위험을 가지고 접근해오는 우주파편에 대한 궤도정보의 정밀도에 의해 성능의 차이를 보일 수 있다. 따라서 이러한 충돌위험 종합관리시스템은 우주파편에 대한 여러 정밀 관측데이터의 처리기능을 가지고 있어야 한다. 본 논문에서는 우주파편에 대해 가장 널리 사용하고 있는 레이더 관측 데이터를 처리하기 위해 비교적 정밀한 궤도결정 정보를 가지고 있는 아리랑 2호 위성에 대한 가상 레이더 관측데이터를 이용하여 정밀 궤도결정을 수행해 봄으로써 개발 중인 충돌위험 종합관리시스템의 성능을 확인하고자 한다. Many countries tried to design the collision risk management system to protect their own satellites from collision probability due to the space debris. In this situation, KARI(Korea Aerospace Research Institute) is developing the KARISMA(KARI Conjunction Risk Management System) to protect our operating satellites from these space debris. The quality of this system is depending on the accuracy of orbit determination for the space debris which has collision risk. Therefore, this system must treat many kinds of measurement data types to estimate the orbit of space debris. In this paper, to handle the radar observation data widely used for these space debris, the orbit determination system was applied with simulated radar tracking data for the KOMSAT-2 which has precise orbit determination data.
Dong-Hyun Cho(조동현),Jong-Sun Lee(이종선) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
In the present study, we used a loop thermosyphon heat exchanger consisting of condensers with internal fins and external plate fins which are 480 mm wide, 68 mm long, and 1,000 mm high. The heat transfer pipes in the heat exchanger were 15 mm in diameter and 1,000 mm in length, and 98 heat transfer pipes were installed in the heat exchanger. According to the experimental results, as the spaces between the internal discontinuous pins decreased, the frequency of pressure drops increased and changes in temperature at the outlet of the condenser were shown to be a little smaller. Therefore, we can see that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased. For the loop heat pipe heat exchanger consisting of a condenser with internal and plate fins, as the temperature of the air flowing into the condenser increased, the condensation heat transfer rate also increased, and as the condenser refrigerant inflow temperature increased, the condensation heat transfer rate increased as well.