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허신,구정서,최진민,Heo, Sin,Gu, Jeong-Seo,Choe, Jin-Min 한국기계연구원 1995 硏究論文集 Vol.25 No.-
Steering column is a typical component that may injure the driver at a frontal collision accident. To protect the driver from an impact, it is very important to study the impact absorbing behaviour of steering column. The dynamic simulation were performed for the ball sleeve type impact absorbing steering column. The simulation results show similar trends to FMVSS 203 test results. Hence using the simulation program developed in this study, it is possible to predict dynamic response of steering system which is used in design modification. Impact absorbing performance of the ball sleeve type steering column with the column angle of $21^\circC$ and $26^\circC$ satisfies the safety criterion of FMVSS 203.
중국 지역 간 건강 수준 차이 원인에 관한 연구 : 티베트자치구(西藏自治區)와 흑룡강성(黑龍江省) 사례 비교
허신,강민아 이화여자대학교 생명의료법연구소 2015 생명윤리정책연구 Vol.9 No.1
중국 내 티베트자치구 지역 주민의 건강 수준은 중국 전국의 평균수준과는 큰 차이를 보이고 있어서 심각한 우려의 대상이 된다. 본 연구는 티베트 지역의 건강수준이 열악한 원인을 파악하기 위하여, 티베트자치구와 비슷한 경제 수준을 유지하고 있으나 건강 수준은 상대적으로 매우 높은 흑룡강성과의 비교사례분석을 통해, 티베트자치구 주민의 낮은 건강 수준을 초래하는 원인을 유추해보고자 하였다. 분석 결과, 의료자원 접근성 및 의료서비스 이용률, 고등 교육 수준과 건강지식 소양, 음식구조, 흡연, 운동습관 등의 개인적 및 제도적 요인들이 티베트 주민의 건강에 영향을 주는 것으로 나타났다. 무엇보다도, 흑룡강 정부는 티베트자치구 정부보다 지역 주민의 건강을 중시하는 정책을 더 적극적으로 활용하는 것으로 나타나, 지역 주민의 건강향상에 있어 정부제도 실행의 중요성이 강조되었다. Residents in Tibet Autonomous region are known to have significantly low health status compared to other regional areas in China. In this study, to understand reason for this disparity in health status between Tibet and other areas, we compared Tibet with Heilongjing Province in terms of three representative health indicators, namely life expectancy, child mortality and maternal mortality. Heilongjing Province was selected as the region’s economic status is similar to that of Tibetan region, but the health status was significantly higher than Tibet region. Our analysis showed that, while Tibet region has a similar level of economic development, it has worse condition for healthy lives for the residents. Residents in Tibet region had worse access to health care service, lower utilization, lower education and health literacy level. At the same time, Tibetan were less involved in healthy life style. They were more likely to smoke and less likely to do exercise than residents in Heilongjing Province. Most critically, Heilongjing government was shown to put more serious effort to improve and maintain health of the residents, using various government policy that prohibits unhealthy behaviors and to promote access to health care service. Overall, this finding implies that, to promote health status of residents, higher health expenditure nor better economy was not sufficient. More active intervention by government should be developed and implemented.
허신,구정서,우창수,김유일,Heo, Sin,Gu, Jeong-Seo,U, Chang-Su,Kim, Yu-Il 한국기계연구원 1996 硏究論文集 Vol.26 No.-
In this study, we performed the static analysis of a cord-reinforced rubber airspring and generated the three-dimensional half-symmetry model which use the finite-strain shell elements to model the airbag. the three-dimensional hydrostatic fluid elements to model the air-filled cavity, and the rebar elements to model the multi-ply nylon reinforcement of airbag. In addition, a three-dimensional rigid surface is used to define the contact between the airspring and metal bead. The air inside the airspring cavity has been modeled as a compressible fluid satisfying the ideal gas law. The conclusions of this study are as follows. 1) In the pressurization step of analysis, we could predict the change of vertical reaction force, cavity volume and pressure within the airspring. 2) In the second step of analyzing vertical static stiffness, the increase of the vertical load increases the vertical stiffness. 3) In case of changing the angle of nylon cord, the increase the angle of nylon cord increases the vertical stiffness.