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활주형 식도공탈장을 동반한 Ivemark씨 증후군 1예
차경훈,김경석,유호성,문경래,박상기,박영봉 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.1
Ivemark's syndrome is rare and characterized by congenital absence of the spleen and a characteristic group of anomalies of the cardiovascular and gastroenteric systems. We experienced a case of Iemark's syndrome: asplenia, dextrocardia, single ventricle, L-malposition of great arteries, common atrioventhcular valve, pulmonary stenosis, situs inversus partialis, and sliding type hiatal hernia. This case had diagnosed by chest x-ray, abdominal x-ray, abdominal CT scan, electrocardiogram, echocardiogaphy, liver spleen scanning and peripheral blood smear. We reported this case with a brief review of related literatures.
복소공간필터에 적용가능한 컴퓨터-생성 홀로그램의 성능비교
차경훈,정종래,백운식 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-
In this papers, we compared two computer generated holograms. One is Pixel-oriented hologram and the other is Detour-Phase hologram. In the Pixel-oriented hologram, we used a direct binary quantization by quantization. We could find that Pixel-oriented CGH is more useful than Detour phase hologram is. we adapted 128 pixel image to two holograms
주거환기용 시로코홴의 내부모터 형상에 따른 공력특성 연구
차경훈(K.H. Cha),김진혁(J.H. Kim),김광용(K.Y. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Aerodynamic characteristics depending on the shape of an internal motor in a small-size sirocco fan for residential ventilation have been investigated. For the aerodynamic analyses of the sirocco fan, three-dimensional Reynolds-averaged Navier-Stokes equations are solved with the shear stress transport model for turbulence closure. The flow analyses are performed on hexahedral grids using a finite-volume solver. The validation of the numerical results at steady-state is performed by comparing with experimental data for the pressure and efficiency. In order to investigate the aerodynamic characteristics depending on shape of an internal motor in a sirocco fan, the reference shape is analyzed compared to the case without internal motor. Additionally, two shape parameters, height and width of the internal motor in a sirocco fan, are tested to investigate their effects on the aerodynamic characteristics. The results show that the shape of the internal motor in a sirocco fan is an important factor to improve the aerodynamic performances.
차경훈 ( Kyoung Hoon Cha ) 한국전과정평가학회 2014 한국전과정평가학회지 Vol.15 No.1
경제성장을 위한 화석연료의 사용은 지구온난화, 자원고갈과 같은 환경문제를 야기하였고, 최근 들어 이러한 환경문제는 전세계로 하여금 풀어야 할 숙제로 받아들여지고 있다. 환경문제에 대한 해법으로서 에너지 시스템 의 신재생에너지화가 논의되고 있는데 이는 신재생에너지가 태양, 바람, 비, 조수차, 지열 등 자연으로부터 발생 되는 친환경 에너지이기 때문이다. 2008년을 기준으로 약 18%가 신재생에너지로부터 발생되었고 세부 항목을 보면 13%가 바이오매스, 3.2%가 수력, 1.8%가 기타이다 신재생에너지는 연간 약 2.7%의 성장률을 보이며 발전하고 있고, 우리나라 역시 18%가 신재생에너지의 점유율로 그중 15%가 수력, 3%가 기타 기원의 에너지원이다. 이렇듯 우리나라 역시 풍력, 수력, 태양광 등의 신재생에너지에 대한 많은 관심을 가지고 있으며 이를 정책적으로 활용하기 위해 다양한 노력을 하고 있다. 본 연구는 환경성과 경제성을 동시에 평가하는 에코효율성 측면에서 신재생에너지의 도입 방안을 마련하고자 하는 것을 목적으로 가지고 있다. 연구 결과 풍력이 환경적으로, 수력이 경제적으로 가장 경쟁력이 있고, 에 코효율성 측면에서는 풍력발전이 가장 좋은 대안으로 도출되었다. 이는 풍력발전의 경우 타 에너지에 비해 작은 투입물질 및 에너지가 요구되고, 상대적으로 간단한 인프라가 필요하기 때문이다. The indiscreet use of fossil fuel for the economic growth caused the environmental problem such as global warming and resource depletion. Recently, the world has recognized the seriousness of environmental problem and makes an effort to solve the trouble. The renewable energy goes down as a solution in other to improve the energy system that has environmental problems. Renewable energy is energy which comes from natural resources such as sunlight, wind, rain, tides, and geothermal heat, which are renewable (naturally replenished). In 2008, about 19% of global final energy consumption came from renewables, with 13% coming from traditional biomass, which is mainly used for heating, and 3.2% from hydro electricity. Renewables (small hydro, modern biomass, wind, solar, geothermal, and biofuels) accounted for another 2.7% and are growing very rapidly. The share of renewables in electricity generation is around 18%, with 15% of global electricity coming from hydro electricity and 3% from renewables. In Korea, wind, hydro, and photovoltaic power are mainly researched and developed in the sorts of renewable energy, because they have high turnover in the sorts of renewable energy and are involved in the main technology of green growth policy. This study aims at identifying the effective introduction method of renewable energy in the context of the environmental and economic aspects using eco-efficiency. As a result, wind power has the high environmental priority and hydro power has the high economic priority in the target renewable energy. Wind power is the best alternative in the context of eco-efficiency aspect. lt is reason that wind power has a little input materials, energy and a simple infrastructure.