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PEMS를 이용한 대형차량 배출가스 측정 및 실시간 희석 요율 산출
맹성호(Sungho Maeng),이범호(Beomho Lee),주경석(Kyoungsuk Joo),이대엽(Daeyup Lee),박용희(Yonghee Park),권상일(Sangil Kwon),전상우(Sangwoo Jeon) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Among the used vehicles, the number of heavy duty vehicles isnot so big, but the effect to environment is so high. So, it is very important to regulate emission and measure precisely in heavy duty vehicles. Chassis dynamometer for heavy duty vehicles which was introduced to the domestic research center in this year can measure exhaust emission of heavy duty vehicles(more than 3.5tons) at real road condition. Beside this measuring system has advantage forsaving time and cost. In spite of these advantages, it is impossible to adjust almost every(0.57million) used vehicles to the system. Therefore, research for measuring emission with PEMS(Portable On-board Emission Measurement System) which is portable and easy to equip, is on process. In this paper, we calculated Dilution Factor as well as analyzed density and total amount of emission to compare CVS(Constant volume sampler) system and PEMS through measured data from a same vehicle at the same time.
이춘미(Chunmei Li),송호성(Hosung Song),맹성호(Sungho Maeng),허인호(Inho Hur) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The automatic transmission is composed by many rotating parts transmitting a driving force. Heat is generated by the friction between the rotating parts, and the function of the parts can be degraded due to the heat. Therefore, adequate lubricating oil (oversupply= power losses, undersupply= lack of lubrication) is needed for the friction parts. The amount of lubricating oil is decided by the shape of lubrication flow and lubricant properties and quantity of lubricating oil. For the adequate amount of the lubricating oil without trial and error, lubrication design method should be developed that can consider the above factors. In this study, CFD is used for the lubrication design method to analyze and reflect the above factors, and the result is equivalent to the experiment. In the future, it is expected to be optimization of the lubrication flow design by using this method.
노인의 사회경제적 지위와 운동참여도 및 성공적 노화의 관계
심지은(Jieun Shim),박수근(Su-keun Park),길재호(Jae-ho Khil),맹성호(Sungho Maeng),신정원(Jungwon Shin),정샘(Sam Chung) 한국발육발달학회 2018 한국발육발달학회지 Vol.26 No.4
The purpose of this study is to verify empirically the causal relationship between socioeconomic status, exercise participation and successful aging in the elderly. For this purpose, among the subjects who completed the survey of the elderly in 2014 conducted by the Ministry of Health and Welfare, 10,178 elderly people aged 65 or older were selected as final analysis subjects. The research instruments set out in this study consisted of 11 items of successful aging including 5 items of socio-economic status and 1 item of exercise participation, including low disease and disability risk area, physical and mental function maintenance area, and active participation area in life. The results showed that the socioeconomic status of the elderly influences on the participation of the elderly and the successful aging, and the representative participation of the health promoting behaviors according to the socioeconomic status has a significant effect on the successful aging. The socioeconomic status of the elderly affects successful aging, but the older the elderly, However, it was confirmed that the participation of appropriate exercise in the socio - economic status of the elderly can lead to successful aging through this study.
노인의 운동참여 정도에 따른 주관적 건강상태와 우울 및 삶의 만족도 간의 관계
이윤표(Younpyo Lee),박수근(Su-keun Park),길재호(Jae-ho Khil),맹성호(Sungho Maeng),신정원(Jungwon Shin),정샘(Sam Chung) 한국발육발달학회 2018 한국발육발달학회지 Vol.26 No.4
The purpose of this study was to examine the relationship between subjective health status, depression, and life satisfaction of the elderly and to examine whether there is a difference between the groups according to the degree of exercise participation of the elderly. Using the microdata of the elderly people surveyed in 2014 conducted by the Ministry of Health and Welfare, we extracted the subjects related to the main variables of this study. The final 6,326 persons were used for analysis. As a result, the results were obtained. First, subjective health status, depression, and life satisfaction of the elderly are significant causal factors in all pathways. Second, the degree of exercise participation in the elderly has a moderating effect on the way of subjective health status to depression level, and the higher the subjective health status, the more depressed level.