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홍영준,정해용,김순호,강민철,김인배 ( Young Jun Hong,Hae Young Jeong,Soon Ho Kim,Min Cheol Kang,In Bae Kim ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.4
N/A Effect of aging treatment on the microstructural evolution of a rapidly solidified Al-3.56wt%Li-0. 97wt%Mg alloy were investigated by differential scanning calorimetry(DSC) and transmission electron microscopy(TEM). DSC analysis showed two exothermic and two endothermic peaks. The two exothermic and endothermic peaks corresponded to δ′and δ+T precipitation and dissolution reactions respectively. The enthalpy of δ´precipitation decreased with increasing of aging temperature and time until the finishing point of precipitation. The activation energy for precipitation of δ´ was measured as 78KJ/㏖ and the energy for dissolution was 95KJ/㏖. These values are higher than those of Al-Li binary alloy. Peak hardness value(Hv 155) was obtained at 210℃ for 1hr aging treatment which coincided with finishing point of δ´precipitation.
홍영준(Young-Jun Hong),최두석(Doo seuk Choi),정영철(Young-Chul Jung),김종일(Jong-IL Kim) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
In this study, we publish the results from my research work using CFD of exhaust heat recirculation device. This study can evaluate the heat exchanger and suggest optimization model base on CFD. Also this study suggest the method of heat transfer efficiency by analyzing thermal hydraulic performance according to internal fluid flow and in and out coolant. This study can contribute to make the fluid flow which is used for efficient design of exhaust heat recirculation device.
홍영준(Hong, Young-Jun),최두석(Choi, Doo-Seuk),정영철(Jung, Young-Chul),김종일(Kim, Chong-Yeal) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.10
최근에 연비향상을 위해 다양한 기술들이 개발 중에 있다. 본 연구의 목적은 배기열 재순환장치의 열교환 성능을 평가한 후 최적 성능의 모델을 제안하는데 있다. 이 장치는 버려지는 배기열을 이용하여 가능한 한 빠르게 엔진 냉각수를 웜업 시키도록 설계하였다. 이 목적을 달성하기 위하여 CFD를 이용하여 냉각수의 흐름 방향과 냉각 수의 유입 유출 위치에 따른 열유동 특성을 분석하고, 열교환 효율을 상승시키기 위한 방법을 제시하였다. 그 결과 냉각수 유량이 적고, 배기가스와 냉각수의 유로를 각각 구성하여 배기가스의 열이 직접적으로 냉각수에 영향을 미치 는 구조가 가장 열교환 효율이 좋은 것으로 나타났다. Recently, various technologies for the fuel efficiency improvement are being developed. The purpose of this study is to evaluate the heat exchanging performance of a exhaust heat recirculation device and to propose a model with optimized performance. The device has been designed to warm up engine coolant as quickly as possible using wasted exhaust heat. To achieve these goals, heat transfer characteristics has been analyzed using CFD for the flow direction effect and in/out location effect of coolant. A method improving the effectiveness of heat exchange has been proposed. As a result, the highest efficiency in heat exchange was observed on condition that exhaust heat affects the coolant directly with a separate flow path between exhaust gas and coolant and that coolant flow rate is relatively low.
홍영준(Young Jun Hong) 한국보건의료연구원 2016 근거와 가치 Vol.2 No.3
The dramatic increase in the incidence of thyroid cancer over recent decades in South Korea is attracting the world’s attention. It also raises strong suspicion of overdiagnosis, because thyroid-cancer-related mortality rates have not changed substantially. Therefore, overdiagnosis and issues related to overtreatment of thyroid cancer in Korea have caused bitter controversy among medical experts. This article takes a quick look at the recent history of these disputes and considers the implications of overdiagnosis and overtreatment of thyroid cancer in Korea, along with appropriate solutions.
홍영준(Young-Jun Hong),최두석(Doo seuk Choi),신석재(Suk-Jae Shin),이경태,정영철(Young-Chul Jung),김종일(Jong-IL Kim),김희진(Hee-Jin Kim),윤영철(Young-Chul Yoon),한인수(In-Su Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, the Exhaust heat recovery system uses waste heat of cold start. This system will be improved efficiency regarding oil temperature of car engine at the beginning, then it will be improved efficiency of fuel efficiency and car engine. This study has developed exhaust heat recovery system because of checking the fast warm-up of the engine. There are heat exchange area of the exhaust gas and cool water within exhaust heat recovery system. It made the area different so that this study can check the performance regarding exhaust heat recovery system. The performance evaluation use the a gasoline engine. This test has proceed in the condition. The condition of warm-up fitted with Load-0%. after that the study checked the time from starting up the engine to warm-up. So this study can confirm to shortening the time of warm-up of exhaust heat recovery system.