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유호천,Yoo, Ho-Cheon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.6
Recent developing tendency of overlay welding on welding materials are studied by searching of NDSL, Science Direct, KIPRIS and so on. Fe, Co, Ni and WC are selected as welding materials. Development and improvement of various new overlay welding technology, especially improvement of quality and formation of crack are introduced. Also the prospective technologies of overlay welding are anticipated.
친환경 자동차산업의 용사(Thermal spray)에 대한 최신 연구동향
유호천,Yoo, Ho-Cheon 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.3
Recent developing tendency of thermal spray for green automotive industry are studied by searching of NDSL, KIPRIS, ScienceDirect and so on. Spraying techniques such as plasma spray, microwave treatment, dry-ice blasting, HVOF thermal spray, cold spraying, aerosol deposition are introduced, further more spraying materials such as nano particles, intermetallic compound, TiAlN, TiC, Si-Al alloys are investigated.
원자력발전 설비의 소재와 용접방법에 대한 최신 기술동향
유호천,Yoo, Ho-Cheon 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.1
Recent developing tendency of nuclear power plant are studied by searching of NDSL, KIPRIS, Science Direct and so on. Welding materials such as low alloyed steels, stainless steels, nickel-based alloys, zirconium alloy and welding methods such as narrow gap welding, laser beam welding, friction stir welding, overlay welding are investigated.
유호천,Yoo, Ho-Cheon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.1
Recent developing tendency of overlay welding on welding methods are studied by searching of NDSL, ScienceDirect and KIPRIS. PTA, Laser cladding, SMAW, GTAW, GMAW, SAW and ESW are selected as welding methods. Development and improvement of various new overlay welding processes and technology are introduced, especially PTA and Laser cladding in abroad overlay welding technology are activated substantially.
유호천(Yoo Ho-Chun),노경환(Noh Kyoung-Hwan) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
In express bus which has no window, the air quality inside the bus is very critical for the passengers who staying for an extended time. Air conditioning system using natural energy is expected to significantly improve the air quality while the bus runs the suburban area. But the express buses today usually attempt to ventilate using air conditioning system, rather than natural ventilation. In this study, analysis of existing ventilation opening and the new ventilation system on roof, using computer simulation. As a result, two cases using existing ventilation device was found to be effective for partial ventilation only, while the air in front remains standstill. The new system proved to have promoted more dynamic ventilation in most of space.
FS 통계분석을 이용한 서울, 부산의 표준 일사량 산정
유호천(Yoo Ho-Chun),이관호(Lee Gwan-Ho),박소희(Park So-Hee),김경률(Kim Kyoung-Ryul) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Applying the daily global solar radiation data measured at least 23 years, the typical solar radiation year for meteorological stations of two cities located in South Korea is generated using the Finkelstein-Schafer(FS) statistical method. Based on the typical solar radiation data obtained, the geographical difference of solar energy resource of these 2 stations was also analyzed. It is expected that the presented typical data for major cities, which has the highest solar energy potential in South Korea, will be useful to the designers of solar energy conversion and utilization devices.
유호천(Ho-Chun Yoo),신인환(In-Hwan Shin) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.2
This research was implemented to elevate indoor air quality of express bus and to generate cooling energy by natural ventilation. A bus with over 26oC of indoor temperature needs cooling from April when season changes owing to human heat and sunlight penetrating through windows. Free cooling, which cools down only by outdoor air is difficult during July and August, a season of scorching weather. However, mere bringing air in can bring about sufficient cooling effect during the rest of seasons. For the purpose, this study proved that adjustment of damper angle was an important factor to bring out the effect. When the angle was 60℃, the amount of air increased by 15~25% compared to when it was 30oC despite reduced chamber entrance surface. Comparing to a model without a damper, about 40% of air decreased. Consequently, this research showed a measure to curtail the cooling load of the express bus while improving the indoor air quality simultaneously.
대한민국 40년간의 기온변동추이와 표준기상데이터 비교분석
유호천(Yoo Ho-Chun),강현구(Kang Hyun-Gu) 한국건축친환경설비학회 2010 한국건축친환경설비학회 논문집 Vol.4 No.2
Extreme weather events and the contamination of global environments caused by global warming are becoming severe. A lot of computer simulations for use in evaluating the function of building energy to reduce energy consumption in a building are being developed and supplied. It is essential to use standard meteorological data of each region for the evaluation of building energy using such computer simulations. This study analyzed the temperature trend over the 40 years (1996-2005) since the nation began the weather forecast and conducted comparative analysi.s on some kinds of standard meterological data currently being used. As for the nation's climatic change over the 40 years, its average temperature had risen about 1.7 , and the number of cooling degree days had increased about 25 while that of heating degree days had decreased about 40. As a result of analyzing the 4 kinds of standard meteorological data currently being used, it was confirmed that there is a difference between the value of meteorological data for DOE being used unofficially and the other 3 values, and the remaining 2 data which was prepared based on Korea Meteorological Administration showed a value similar to that of standard meteorological data provided by Korea Solar Energy Society. It is pointed out as a problem that the meteorological data for DOE, the unofficial data currently being used, showed a distribution of temperatures lower than other meteorological data and the ommission of the amount of solar radiation.