• Journal of the korean Society of Automotive Engineers
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• v.7 no.3
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• pp.30-35
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• 1985

자동차가 처음 만들어진 당시에는 목적지까지 무사히 도착하는 신뢰성이 중요한 과제가 되었으리 라 생각된다. 무사히 도착되니 다음은 어떻게 하면 빨리 도착할 수 있을까하는 요구에서 고속화 즉 기관의 고출력화가 이루어졌다. 자동차의 편리함이 인식되고 또 보급됨에 따라 자동차가 주 위한경에 미치는 영향이 문제가 되어 1960년대 후반부터 자동차배출가스규제가 시작되고 이어서 소음규제가 실시되어 점차 강화되고 있다. 1973년부터 시작된 석유위기이래 자동차의 석유사용 량을 저감시키는 목적으로 미국에서는 연비규제가 실시되기에 이르렀고 다른 국가들도 거기에 따르고 있다. 미국의 1975년 에너지정책, 보존법(Energy Policy and Conservation Act of 1975 )은 1974년의 평균연비 14mile/gallon을 1985년까지는 약 2배의 27.5mile/gallon까지 높이고자 하는 것이다. 가까운 일본에서도 약 35%정도 향상되고 있는 실정이다. 자동차의 저연비특성은 제품기능으로 점차 중요시되는 동시에 국가차원에서는 석유에너지절약의 한 방편으로 사회적으 로도 해결하여야할 입장에 이르렀다. 이 에너지 절약 문제는 자동차의 소형화를 포함한 국제 적인 자동차 재개발문제로 발전, 80년대의 신기술개발의 최대과제가 되고 있다. 또 최근의 사용 자의 요구는 운전성, 실용성에 대해서도 까다롭고 또 다양화하고 있다. 이들 요구와 엄격한 배 출가스규제 및 소용규제를 만족시키면서 연비저감을 꾀하느것인 만큼 실로 어려운 일임에는 틀 림없다. 여기서는 가솔린기관 승용차의 연비저감을 중심으로 규제의 상황, 연비의 향상기술에 대해서 논하고자 한다.

• Journal of Korean Society of Transportation
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• v.20 no.2
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• pp.117-124
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• 2002

새로 개발한 철재 교량용 방호울타리는 기존 시설에 비해 충격흡수기능과 조망권 확보, 융설작업, 유지보수가 용이하도록 설계되었다. 본 연구는 새로 개발한 철재 교량용 방호울타리를 건설교통부의 $\ulcorner$도로안전시설 설치 및 관리지침 - 교량용 방호울타리 편. 1999$\lrcorner$ 의 설계기준에 따라 기존 고속도로에 사용하고 있는 F형 콘크리트 교량용 방호울타리와 성능비교를 통해 평가하고자 하였다. 비교평가는 S2급 교량용 방호울타리의 시험기준으로 실시하였으며 결과는 다음과 같이 나타났다. 첫째, 소형승용차를 대상으로 한 운전자의 안전도 평가에서는 두가지 시설 모두 강도성능, 충돌 후 차량 안전성능 구성 부재 비산 억제 성능 등 세 가지 기준을 만족하였으나, 가속도 기준에 있어서는 철재 교량용 방호울타리는 기준인 20g 이하인 18.2605g로 나타나 안전기준을 만족하였고, F형 콘크리트 교량용 방호울타리는 20.1791g로 나타나 기준을 약간 상회하는 것으로 나타났으나 안전기준의 범위에 있는 것으로 평가하였다. 둘째. 대형차량을 대상으로 한 방호울타리의 구조적 안정성 평가에 있어서는 F형과 철재 교량용 방호울타리 모두 평가기준에 적합한 것으로 나타났다. 새로 개발한 철재 교량용 방호울타리는 국내 최초로 모의충돌시험과 실물차량 충돌시험을 통해 개발하였다는 의의를 가지고 있으며 성능측면에서도 기존의 시설에 비해 충분히 안전하다는 것을 증명하였다. 그러나 측정시설의 미비로 충돌후의 차량의 이탈속도나 이탈각도에 대하여 만족할 만한 수준의 결과를 제시하지는 못하였다.

• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.1
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• pp.46-51
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• 2014

2,097 deaths out of 5,229 by traffic accident occurred by vehicle to vehicle crash and 855 deaths out of 2,097 occurred at side crash in 2011. Korean government adopted New Car Assessment Program to reduce the wounded and deaths at traffic accident in 1999 and side impact test has been added in 2003. 43 out of 53 vehicles tested in NCAP side impact rated 4 and 5 stars means the highest occupant protection. In this study three small class vehicles have been tested according to Insurance Institute for Highway Safety's side crashworthiness test protocol. IIHS test protocol uses 1,500kg moving barrier rather than NCAP's 950kg and the occupant protection rated Good, Acceptable, Marginal and Poor based on injury measure, structural integrity and head protection.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.12 no.2
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• pp.91-99
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• 2013

Car cross beam made by aluminium for new car is designed for the substitution of steel and it can be verified the performance by computer simulations. The parts of car cross beam are designed to replace steel parts according to their manufacturing processes. At the first stage, the weight of the aluminium car cross beam can be reduced to 75% by comparing with that of steel car cross beam. But NVH performance of the aluminium car cross beam becomes slightly insufficient as compared with that of steel car cross beam. Taguchi method is adopted to optimize the design variables affecting NVH characteristics of car cross beam. New car cross beam is designed at the second stage by using these analysis results. Weight reduction can be obtained to 31.7% by design modification and material change of car cross beam in comparison with the original steel one. NVH characteristics of aluminium car cross beam become on an equal level with the steel car cross beam. By side impact analysis results, new car cross beam has higher performance as compared with the steel car cross beam.

• Journal of Korean Society of Transportation
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• v.16 no.4
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• pp.65-74
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• 1998

본 연구에서는 부산시 도심상업지역 중 특히 노상에서 하역이 빈번하게 이루어져 교통상의 문제가 되고 있는 지구를 중심으로 하여 하역의 실태와 특성을 파악하고, 하역을 적절히 처리할 수 있는 필요 하역주차공간을 산정해 그 활용방안에 대해서 고찰을 행하였다. 본 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 부산시 도심상업지역의 점포에서 반.출입되는 화물의 수송형태는 공동수송보다 개별적으로 수송되는 경우가 더 많았다. 도심상업지역의 시각별 순간노상주차현황을 보면 승용차의 비율이 높으나 화물의 반.출입에는 소형트럭이 가장 많이 이용되고 있으며 목적시설과 가까운 곳에 주차하려는 경향을 보이고 있다. 하역주차공간산정을 위해 대기행력 시뮬레이션 모델을 활용한 결과, 도심상업지역에 있어서 도로길이에 따른 불법주차 발생비율과 필요한 하역주차공간과의 관계를 명확히 할 수 있었다. 하역주차공간산정을 위해 대기행렬 시뮬레이션 모델을 활용한 결과, 도심상업지역에 있어서 도로길이에 따른 불법주차 발생비율과 필요한 하역주차공간과의 관계를 명확히 할 수 있었다. 한편, 무질서한 노상하역을 배제하기 위해서는 주차공간의 적절한 배치가 무엇보다 중요하며 또한 장기적인 안목에서 노외 하역주차공간의 확보 및 화물의 공동집배송 등에 관한 여구가 지속적으로 이루어져야 할 것이다.

• Journal of the Korean Society of Industry Convergence
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• v.25 no.3
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• pp.407-415
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• 2022

In this study, a square rounding sidewalk block frame was developed considering the simplicity of construction and the superiority of aesthetics. In addition, it is possible to prevent damage, deformation, and settlement of adjacent sidewalk blocks due to plastic deformation during car impact load of installed bollad. A non-linear structural analysis was performed through finite element analysis to examine the performance of a car crash to which this was applied. Structural safety was confirmed through car crash simulation according to the direction of impact, and it is estimated that the function can be restored by replacing some parts in case of damage due to impact.

• Journal of Environmental Policy
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• v.14 no.4
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• pp.23-44
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• 2015

The policy aimed at introducing a Bonus-Malus system to reduce GHG and raise the market share of small cars is scheduled to go into effect in South Korea in 2020. Although the policy was originally planned to be enforced from 2015, the Ministry of Trade, Industry and Energy argued that the system brings low reduction effect and relative disadvantage to domestic small cars and brought arguments in 2014. As a result, the enforcement was pushed back. Related studies are mainly focused on offering statistical estimation of the policy's effect to support the arguments, and few theoretical studies were published given that there was not enough time until 2015 back then. The author approached the issue with mathematical modeling in order to give theoretical basis for sophisticated empirical studies. If car suppliers have market power and strategically set their prices, the impact of Bouns-Malus on car prices would be lower than what was originally intended. In case only a part of the car market loses its market power, the effect of the policy would be improved. Assume that the Bonus-Malus is currently at an optimal level and the car market structure is undergoing changes, then the direction of the new optimal level would depend on the elasticity of demand of each market and substitute elasticity. For example, if the car market becomes more monopolistic while the demand for big cars is elastic, demand for small cars is inelastic and substitution elasticity is low, then the new optimal level of Bonus-Malus should be higher.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.4002-4006
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• 2014

The automotive exhaust gases generated by the vehicles containing carbon monoxide, hydrocarbons and lead, is a large concern because of their harm to human health or the living environment. To reduce exhaust gas, it is important to develop a variety of techniques that are currently being used by elemental analysis to determine the optimal conditions. In this study, the anti-freeze coolant contained in the exhaust gas was examined, which can affect the emissions. The effects of the commercially available coolant from five domestic companies on the HC, NOx and $CO_2$ emissions were analyzed to determine the optimal amount of antifreeze. In addition, antifreeze products from the five companies were analyzed with respect to driving time of the cooling fan and the correlation of the NOx emission analysis. The temperature of the engine oil was matched using a manual gear of small passenger inspection standard speed $40{\pm}2Km/h$ so the vehicle could meet the specifications for inspection $90{\sim}93^{\circ}C$. The Company D fan operation time resulted in the shortest antifreeze, $CO_2$ and NOx emissions.

• Journal of the Korean Society for Railway
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• v.14 no.2
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• pp.188-193
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• 2011

In order to solve urban transportation problems, the various alternatives are presented to the public transportation system but the master plan of construction and operation is that there is no validity. PRT unlike other public transport system, is a new transport system that can respond appropriately, to solve the traffic demand, environmental and energy problems. Meanwhile, national and international PRT system was not commercially and the actual construction and operation of the PRT in case of base research is not well established. In this paper, PRT concept was established as the new transportation system, the target area(Nan-gok area) was selected to examine the feasibility of PRT systems and the corridor analysis method has been developed to predict the PRT demand as a basic material of planning process.

• Archives of design research
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• v.17 no.3
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• pp.449-460
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• 2004

Various types of the sports utility vehicles become more popular in these days. This phenomenon says the increasing demand of performance oriented vehicles for the various life style It is changing now the rather the simple needs of passenger cars of the past. This popularity is due to not only for the increased leisure time which resulted from the five day working labor policy, but also the development of automotive technology. In addition to a large variety of vehicle and enhanced performance is another reason either. There have been many kind of multi-functional vehicles from the early days of the automotive history, and most of them have been evolved from the $\ulcorner$Jeep$\lrcorner$ which were developed by American makers. And various type of orthodox and crossover vehicles that is combined to many functional aspects for a transportation has been revealed so far. Usually the ambi-tendency has been revealed, in which the crossover vehicle has been become compact, on the other hand the orthodox type of 4-wheel drive vehicles has been become larger for being heavy duty vehicles. And this would be expand widely to more vehicles and brands in the future.