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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.
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.
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.
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.
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.
조동현(Dong-Hyun Cho),권혁용(Hyeok Yong Kwon) 경희대학교 인류사회재건연구원 2016 OUGHTOPIA Vol.31 No.1
불평등 문제가 한국사회에서 중요한 이슈임에는 의심의 여지가 없다. 최근 들어 불평등의 정치사회적 효과에 대한 연구들도 급속하게 축적되어왔다. 이 논문은 결과의 불평등(inequality of outcome)인 소득불평등과 기회의 불평등(inequality of opportunity)에 대한 인식이 개인의 행복에 미치는 영향을 분석한다. 기존 연구들과 달리, 이 논문은 불평등에 대한 인식과 행복의 연결고리에 소득수준, 이념성향 그리고 세대라는 매개변수가 어떠한 조건적 효과(conditional effects)를 갖는지 분석한다. 즉, 소득계층별(저소득층-중산층-고소득층), 이념성향별(진보-중도-보수), 그리고 세대별(2030세대-민주화세대-산업화 · 노년세대)로 사회집단별로 불평등에 대한 인식과 행복의 관계를 분석한다. 2009년 한국종합사회조사(Korean General Social Survey)를 이용한 분석결과, 소득불평등에 대한 인식은 개인의 삶의 만족도에 아무런 영향을 미치지 못한 반면에, 기회불평등에 대한 인식은 고소득층, 이념적 중도층 그리고 민주화 세대(35세 이상~50세 미만)에게서만 뚜렷하게 삶의 만족도에 부정적인 영향을 미치는 것으로 나타났다. Rising inequality is undoubtedly one of the important issues in Korea. Recently, studies on the political and social consequences of inequality have been accumulated in the literature. This paper examines the effects of percetions of income inequality and inequality in opportunities on individual happiness. Unlike the previous studies, this paper focuses on the conditional effects of income strata(low income-middle income-high income), ideological dispositions (progressive-moderate-conservative) and generations (2030s-democratization cohort-industrialization cohort) in linking the perceived inequality and happiness. Our analysis using the 2009 Korean General Social Survey finds that the perceived income inequality did not exert any effect on individual happiness. However, the perceived inequality in opportunities is negatively associated with happiness among the high income group, ideological moderates, and democratization generation(ages 35-50).