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차량용 에어컨 압축기의 선조질강 헤드 볼트 개발에 대한 연구
김영신(Youngshin Kim),김호겸(Hokyoum Kim),황승용(Seungyong Hwang),김영만(Youngman Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
This paper is a study on the head bolts, used in A/C compressor, for reducing production cost and solving leak problems on the head bolt seat area causing a massive faulty according to production lot intermittently. In this paper, the pre-heat treated steel eliminating heat treatment process after forging was used for the head bolt as material. The preheat treated steel head bolts, 10 % lower than the usual SCM435 head bolts in tensile strength, were selected for this study by considering the results of creeping rupture properties, axial force and stress concentration per tensile strength variation. And then the performance test and the durability test with the A/C compressor assembled with the pre-heat treated steel head bolts were performed and verified. As the results, the pre-heat treated steel head bolts developed in this study showed the cost saving with 7.3 % by eliminating the heat treatment process and logistics process. Additionally, the leak problem on the head bolt seat area in the A/C compressor was improved significantly on the assembly line of mass production.
Automatic Take-off and Landing of the Small Scaled Tilt Rotor UAV based on Single GPS/INS
Youngshin Kang,Bumjin Park,Yushin Kim,Changsun Yoo,Samok Koo,Seongpil Kim 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A small scaled night model of the tilt rotor aircraft for the Smart UAV Program at KARl (Korea Aerospace Research Institute) has been developed and tested. The night test of automatic take off and landing of the small scaled model was performed as the final test phase. The control laws for automatic take off and landing was designed based on a single GPS/INS. Since the error of single GPS/INS was nut negligible so that an automatic landing algorithm with the sensor error was considered. The night test procedure for the automatic take off and landing was considered to prove the performance of a single GPS/INS sensor and flight characteristics of small tilt rotor aircraft The test procedure was scheduled as an automatic take off, a climb with acceleration while point turn, an change of the turn point. a descent with deceleration in point turn, an automatic approach to hover, and an automatic landing. All of the control inputs were made by an internal pilot (IP). The night test results and the detailed procedure of the night test for the automatic takeoff and landing of the small scaled lilt rotor aircraft is presented in this paper.
The Shape of Middle Cerebral Artery and Plaque Location: High-Resolution MRI Finding
Kim, Bum Joon,Yoon, Youngshin,Lee, Deok-Hee,Kang, Dong-Wha,Kwon, Sun U.,Kim, Jong S. SAGE Publications 2015 International journal of stroke Vol.10 No.6
<P>The location of plaque may be associated with the vascular geometry.</P>
Kim, Young-Min,Kim, Jihyun,Han, Youngshin,Lee, Byung-Jae,Choi, Dong-Chull,Cheong, Hae-Kwan,Jeon, Byoung-Hak,Oh, Inbo,Bae, Gwi-Nam,Lee, Jae Young,Kim, Chang-Heok,Seo, SungChul,Noh, Su Ryeon,Ahn, Kangmo Elsevier BV 2017 Science of the Total Environment Vol.579 No.-
<P><B>Abstract</B></P> <P>We estimated the exposure to ambient air pollutants and analyzed the associations with allergic diseases. We enrolled 177 children with atopic dermatitis (AD) and 70 asthmatic adults living in Seoul Metropolitan Area, Korea, and followed for 17months between August 2013 and December 2014. Parents or patients recorded symptom scores on a daily basis. Exposure to particulate matter with a diameter <10μm (PM<SUB>10</SUB>) and nitrogen dioxide (NO<SUB>2</SUB>) was estimated in four different ways in each individual, using the AQ1 (measurements from the nearest air quality monitoring station to residential houses), AQ2 (measurements modified from AQ1 with the indoor level of air pollutants and time activity of each individual), AQ1-DI, and AQ2-DI (measurements modified from AQ1 and AQ2, respectively, with daily inhalation intakes of air pollutants). A generalized linear mixed model (GLMM) was used to analyze the associations between exposure metrics and clinical symptoms after adjusting for ambient temperature and humidity, age, season, gender, and time trend. The exposure metrics for PM<SUB>10</SUB> and NO<SUB>2</SUB> showed different distributions. Symptoms of AD and asthma were positively associated with exposure to PM<SUB>10</SUB>, but not NO<SUB>2</SUB>, in all exposure metrics. The effect size of PM<SUB>10</SUB> exposure on asthma symptoms was slightly greater in metrics with inhalation capacity (AQ-DIs) than in those without (AQs). This pattern was not observed in AD. Exposure to PM<SUB>10</SUB> is associated with symptom aggravation in childhood AD and adult asthma. Different exposure estimates may be used to evaluate the impact of air pollution on different allergic diseases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new method for estimating personal exposure to air pollutants was proposed. </LI> <LI> Personal exposure of air pollution showed different spatial and temporal distribution from ambient concentration. </LI> <LI> The effects of air pollution on allergic symptoms varied by exposure metric and disease. </LI> <LI> The effect sizes of PM<SUB>10</SUB> exposure on asthma symptoms can be greater in metrics that considered inhalation capacity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>