• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.543-550
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• 2000

This study investigated and analysed the surface contaminant of the passenger car. Because the surface contaminants change the paint color of the passenger car, it is necessary to cleanse them for prolongating the maintenance period, Analysis method of the contaminant according to the kind of the passenger car, the line and the part of the train are systemized. Contamination mechanism and deterioration reason of paint colors on the surface of passenger car are studied. We expect that results of this study could contribute to providing of a fundamental research data, which is necessary for the development of a low-pollution passenger car cleanser.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(I)
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• pp.193-201
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• 2002

The development of railway vehicle and bogie involves the proper selection of design parameters not only to achieve high speed but also to reduce the vibration of the train. In this study an analytical model of a high speed freight car is developed to find the critical speed. The high speed freight car can generate the snake motion of the lateral and yawing motion of the car body, the bogie, and the wheelset. Numerical analysis for the nonlinear equation motions with 17 degrees of freedom showed the running stability and critical speed due to the snake motion. Also, the vibration modes of tile high speed freight car was calculated using ADAMS RAIL, which showed that the critical speed have the yawing modes of the car body and the bogie. Finally, this paper shows that the snake motion of the vehicle can be controlled with the modifications of the design parameters.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.971-975
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• 2005

In this study, a car-door-controlled collision protection system using proximity sensor is proposed and its preliminary analysis and several preliminary experiments are conducted. The proposed system has three additional sub-components on the car-door that is, a pair of extra electro-magnetic actuator that are attached to the sliding bar of the open/close car-door four-bar mechanism, a proximity sensor that would be attached to the outside surface of the door which is likely to frequently contact to the object and a driving control circuit of the whole system. A proximity sensor is used to detect object close to the car-door, the driving control circuit provides actuating power command to the electro-magnets to generate braking force to stop the swing motion of the car-door. It is verified through kinematic analysis of the four-bar car-door open/close mechanism and through experiments that the magnitude of maximum electronic magnetic force could provide the braking force enough for this application. For this purpose, an electro-magnet driving circuit is implemented and tested. And also to increase the safety of the system a time delay circuit is implemented and tested.

• 한국산학기술학회논문지
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• 제11권11호
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• pp.4100-4107
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• 2010

사고 현장에서 사고 차량을 옮기거나 주차위반 차량을 견인사업소로 이동시키기 위해 주로 이용되고 있는 리프트식 견인차는 피견인차의 구동방식에 따라 차량의 전부 또는 후부을 들어 올려 구동 바퀴로 이동할 수 있도록 하는 특수차량이다. 각 차량은 CATIA를 이용하여 모델링하고 이를 상용 유한요소해석 프로그램인 ANSYS를 통하여 피견인차의 후부를 주행 차량이 들이 받는 추돌을 시뮬레이션한다. 본 논문에서는 견인중인 견인차와 이송중인 전륜 피견인차 및 일반 주행 중인 차량 사이에서 일어날 수 있는 3중 추돌사고를 일반적인 3중 추돌사고와 비교하여 견인중에 발생하는 추돌사고가 얼마나 위험한지를 직접 확인한다. 또한 견인차가 피견인차를 들어 올려 발생되는 피견인차의 각도에 따른 추돌의 영향을 해석한다.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2003년도 가을학술발표대회
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• pp.16-17
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• 2003

• 한국기계가공학회지
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• 제19권2호
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• pp.75-80
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• 2020

In this study, we designed car frames for collision analysis using carbon fiber reinforced polymer (CFRP) as the lighter composite material. The impact conditions were 100 percent frontal impact, 40 percent frontal impact, and 90 degrees side impact. The impact analysis measured the maximum stress at velocities of 20km/h and 40km/h for each condition and evaluated the vulnerable points in the car frame. Additional supports have been designed both to improve the weak points in existing vehicle frames, and to be taken into account when new parts are assembled. Our impact analysis compared the results of maximum stress on the car frame with and without the support.

• 대한토목학회논문집
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• 제34권4호
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• pp.1241-1249
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• 2014

본 연구는 수원 시민들을 대상으로 카쉐어링 선호도 요인을 분석하여 제시하였다. 시민의 약 60% 정도가 카쉐어링 이용을 고려하고 있으며, 남자가 여자보다, 젊은 층이 장년층보다, 단독주택과 오피스텔이 아파트와 연립주택보다, 대중교통 이용이 불편한 시민이, 차량 미소유자가, 자동차를 일주일 1~3회 이용하는 통행자들의 카쉐어링 선호도가 높은 것으로 나타났다. 특히 주거 밀집지역과 대중교통 역 주변에서의 카쉐어링 잠재수요가 가장 높은 것으로 나타났다. 요금체계는 시간당 지불방식을 가장 선호하였으며, 시간당 7,967원의 지불용의가 있는 것으로 조사되었다. 통행목적에서는 업무 쇼핑 여가 레저 통행에서 카쉐어링 선호도가 택시 및 렌터카보다 높은 것으로 확인되었다. 본 연구결과는 카쉐어링 사업 시행의 정책방향 결정에 기여하며, 카쉐어링의 활성화에 도움이 될 것으로 기대된다.

• 한방재활의학과학회지
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• 제24권1호
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• pp.65-76
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• 2014

Objectives The purpose of this study is to investigate the corelation between traffic accident severity and treatment period and cost by traffic accident. Methods Outpatients who visited Jaseng Korean medicine hospital traffic accident clinic were investigated by hospital computer system about period and cost of treatment. And we requested for repair cost of car, a sort of car groups and agreement date with car insurance company to insurance company. Therefore we could analysis statistical correlation of traffic accident severity (repair cost of car) with period of treatment, cost of treatment, number of treatment in same sort of car groups. For statistics, we used SPSS version 18.0 for windows. Results A significant positive correlation was found between traffic accident severity (repair cost of car) with repair cost of car, cost of treatment and number of treatment in semi-midsize car, midsize car group. But, any significant correlation wasn't found between traffic accident severity (repair cost of car) with repair cost of car, cost of treatment and number of treatment in small car, full-sized car group. In SUV (sport utility vehicle) car group some significant correlation was found, but it isn't between traffic accident severity (repair cost of car) with repair cost of car, cost of treatment and number of treatment. Conclusions It was found that traffic accident severity (repair cost of car) had an effect on cost of car, cost of treatment and number of treatment by statistical analysis. But, it was also suggested strongly that other factors like a cost of car and ages had an effect on them.

• 한국인터넷방송통신학회논문지
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• 제15권3호
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• pp.201-209
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• 2015

차대차의 측면충돌에서 충돌부위에 따라 차체의 변형정도는 크게 달라진다. 충돌로 인하여 차체에 변형이 일어나는 경우에 속도에너지가 변형에너지로 전달되어 거동이 달라진다. 일반적으로 교통사고분석에서는 충돌 후 차량의 거동을 운동량 보존법칙으로 분석하며 차체의 변형에 따른 에너지 흡수량은 반발계수를 입력하여 그 오차를 보정할 수 있으나 측면충돌에 대한 연구결과는 그다지 많지 않으므로 전방충돌과 후방추돌에 대한 연구결과를 참고해서 반발계수를 적용하고 있는 실정이다. 본 연구에서는 차체의 구조와 각 부품의 재질을 적용한 유한요소 차량모델을 외연적 유한요소법으로 해석하였으며, 그 결과를 분석하여 측면충돌에서 차량의 접촉부위에 따른 반발계수와 충돌감지시간을 도출하였다. 최종적으로 산출된 반발계수와 충돌감지시간을 적용하여 운동량보존법칙에 의해 얻어진 해석결과를 실제 차량의 충돌결과와 비교하였다. 그 결과로 유한요소해석 모델을 이용하여 도출한 초기 입력값을 적용했을 때 기존의 분석기법보다 해석의 신뢰도가 높다는 결과를 얻게 되었다.

• 산경연구논집
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• 제12권5호
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• pp.37-46
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• 2021

Purpose: The purpose of this paper is to explore factors that affect electric car-sharing by highlighting issues of environmental sustainability and customer attitude and satisfaction. Research design, data and methodology: This study examined customers' perception on those issues by using electric car-sharing as usages of both electric car and car-sharing play a key role to improve sustainability. Online survey was applied to collect the data. This study also applied factor and regression analyses for data analysis. Results: The results of this study showed that effects of proposed factors including cost efficiency, emotion, safety, health, and sustainability on attitude toward electric car-sharing on attitude were significant. The results also showed that the effects on intention, satisfaction, and loyalty were significant. Conclusions: This study provides policy and managerial implications. By dealing with factors of electric car-sharing service, this study offers necessity of better strategies and policies for electric car-sharing service to electric car businesses and policy makers. This study also suggests that businesses should develop appropriate strategies for the improved usage of electric car-sharing by considering sustainability and improving relationships with customers. Further, government should consider to develop proper policies for sustainability by promoting the usages of electric car-sharing.