• International Journal of Highway Engineering
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• v.11 no.4
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• pp.41-47
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• 2009

This study deals with the side-swipe accidents of 4-legged signalized intersections in Cheongju. The objectives are to analyze the characteristics of the accidents and to develop the related models. In pursuing the above, this study gives particular emphasis to finding the appropriate methodology to modelling. The main results are as follows. First, injuries were analyzed to be twice than property-only accidents in the side-swipe accidents. The accidents were evaluated to occur more in inside-intersection. Also, the accidents were analyzed to be almost the auto-related accidents and to be occurred by the unsafely-driving activity. Second, multiple linear regression models were evaluated to be more statistically significant than multiple non-linear. The most fitted models were analyzed to be the models with the number of accidents as the dependent variable. The factors of side-swipe accidents analyzed in this study were ADT, area of intersection, right-turn-only-lane, number of pedestrian crossings, limited speed of main road, maximum grade and number of signal phase.

• Proceedings of the KOR-KST Conference
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• 2007.11a
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• pp.348-356
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• 2007

• Journal of Korean Society of Transportation
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• v.26 no.5
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• pp.153-162
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• 2008

This study deals with the traffic accidents at the 4-legged signalized intersections in Cheong-ju. The purpose is to comparatively analyze the characteristics and models by the accident type using the data of 143 intersections. In pursuing the above, this study gives particular emphasis to modeling such the accidents as head on collision, rear end collision, side swipe, side right angle collision, and others. The main results are the followings. First, the overdispersion tests show that the negative binomial regression models are appropriate to the traffic accident data in the above contexts. Second, five accident models are developed, which are all analyzed to be statistically significant. Finally, the models are comparatively evaluated using the common variable(ADT) and type-specific variables.

• Journal of Science and Technology Studies
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• v.10 no.2
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• pp.77-105
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• 2010

This essay aims to look into the possibility and limit of a technological fix with the PSD (platform screen door), which was proposed as the solution of subway risk problems. Subway risk problems may be classified into five categories-on-rail accidents, in-station accidents, platform accidents, spatial risks in underground, and risks due to a crime or terror-, and the platform accidents, which happens at the interface between the rail and the station, is the most serious and prominent. The PSD is considered as an effective technical means to prevent platform accidents. However, there remains a possibility of aggravating unexpected and invisible risks. When a fire breaks out in platforms, especially at exchange stations during the rush hour, the PSD can become a "wall of outcrying", since it may act as the "safety shutter" which killed many people in the 2003 Daegu subway disaster. This is why we need to look into the limit of a technological fix with the PSD.

• International Journal of Highway Engineering
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• v.10 no.3
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• pp.33-46
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• 2008

A two-lane highway has a high rate of head-on collisions, sideswipe collisions, crashes with an fixed object. This study was to analyze the weakness of a cross section and a horizontal curve in a two-lane highway and find countermeasures to improve the traffic operations and safety. This study evaluated the effectiveness of widening, curve flattening and superelevation, verified it with a case study and assessed the economical efficiency. This study selected the difference between tangent section operating speeds and curve section operating speeds as an evaluation index of horizontal curve section in a two-lane highway. The results indicated that curve flattening is the best way to improve the traffic safety in a two-lane highway. This study has implication that it provides the quantitative effects of curve flattening. Also directions for future study were discussed.

• Journal of the korean Society of Automotive Engineers
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• v.18 no.4
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• pp.1-17
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• 1996

자동차의 안전에 대한 연구는 객실의 변형제한과 승객의 감속도 축소를 위한 여러가지 구조부재의 에너지 흡수능력 및 흡수 메카니즘을 연구하는데 초점이 맞추어져 왔다. 그 이유는 충돌사고시에 인명을 보호하기 위해서는 차제변형에 의한 물리적 접촉의 회피 뿐 아니라 충돌에너지를 적절히 흡수조절하여 충돌력을 감소시키도록 구조부재를 설계함으로써 충돌안전성이 확보되기 때문이다. 충돌에너지 흡수 특성은 구조부재의 단면 형상과 재질에 따라 달라지며 압괴모드도 구분되어진다. 즉, 복합재료의 압축붕괴특성은 금속이나 플라스틱 재질과는 다르다. 일반적으로 복합재는 재질의 파손으로 에너지가 흡수되지만 금속재는 소성변형으로 에너지를 흡수한다. 이때의 붕괴양상은 작용하중에 따라 축방향 붕괴, 굽힘붕괴, 측면붕괴의 경우는 정규압괴모드(compact mode) 및 불규칙압괴모드(noncompact mode)로 나뉘고, 원통쉘의 경우는 축대칭모드 및 다이아몬드형 모드 등으로 나뉠수 있다. 원형 및 사각 튜브는 광범위한 형상비와 후폭비를 가지도록 제작할 수 있으며 산업전반에 걸쳐 널리 쓰이므로 충돌특성 연구의 대상으로 많은 연구들이 진행되어 왔다. 또한, 충돌특성의 해석을 위한 이론적 모델이 제시되었으며 계속적인 보완이 이루어져 오고 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.2
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• pp.217-226
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• 2018

Since the sides of a vehicle are designed asymmetrically unlike its front or rear, the degree of deformation of the car body greatly differs depending on the site of collision if a broadside collision takes place. When elastic deformation and plastic deformation occur in the car body occur due to a collision, the kinetic energy is absorbed into the body, and the momentum decreases. Generally, an analysis of traffic accidents analyzes the vehicle's behavior after a collision by the law of momentum conservation and corrects the error of the amount of energy absorption due to the deformation of the car body, applying a restitution coefficient. This study interpreted a finite element vehicle model applying the structure of the car body and the material properties of each part with LS-DYNA, analyzed the result and drew the restitution coefficient and the depth of penetration according to the contact area of the vehicle in a broadside collision between an SUV and a passenger car. When the finally calculated restitution coefficient and depth of penetration were applied to the examples of the actual traffic accidents, there was an effect on the improvement of the error in the result. It was found that when the initial input value, drawn using the finite element analysis model, it had a higher reliability of the interpretation than that of the existing analysis techniques.

• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.89-89
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• 2011

도로의 가드레일 지주 근입깊이의 부족에 의한 자동차의 전락사고 이 후, 일본의 국토교통성 등의 관계자들이 그 대책 세우기에 부심해 왔으나, 기설 지주의 근입깊이를 측정할 수 있는 방법은 아직까지 알려져 있지 않으며, 현재로서는 작업의 전 과정을 비디오로 촬영하여 그 기록을 남기도록 되어있다. 그러나 그것은 상당히 비효율적인 작업으로 엄밀한 감시기능을 다하지 못하고 있으며, 감독자와 시공자의 양자로부터 계측 도구의 개발이 절실히 요구되고 있다. 일부의 초음파 측정기 업자가 가드레일 지주의 근입깊이를 측정할 수 있다고 주장하고 있으나, 시장에는 아직 나타나지 않고 있으며, 그 측정시스템의 측정여부와 성능의 검증이 이루어지지 않고 있는 상황이다. 지금까지 충격탄성파법 또는 초음파법을 이용하여, 매설된 가드레일 지주의 근입깊이를 측정한 성공사례가 정식으로 보고된 바는 없으며, 같은 강관주인 눈사태 방지책의 지주 파이프에 대한 근입깊이의 측정은 본 연구그룹의 의해 행하여진 바가 있다. 검사봉이나 해머 등으로 대상물을 두드려서 탄성파를 발생시키고, 그것을 가속도계 또는 속도계의 진동센서로 감지하여 그 파형을 분석함으로써 대상물의 치수 등을 측정하는 충격탄성파법은, 특히 콘크리트를 대상으로 공동 및 매설물 등의 탐사, 균열깊이의 측정 등에 폭 넓게 사용되고 있다. 하지만 이 측정방법을 가드레일의 지주의 근입깊이 측정에 적용할 경우, 일반적으로 행하여지는 방법, 즉 진동센서를 대상물의 상단부(캡)에 설치하는 방법으로는 접합부에 의한 탄성파의 손실과 캡의 휨 진동에 의한 노이즈 등을 해결하기가 곤란해진다. 또한 지반의 존재로 인한 진동 모드의 변화와 진동에너지의 감소 등의 문제점을 해결하지 않으면 안 된다. 본 연구는 충격탄성파법을 이용하여 지반에 설치된 눈사태 방지책이나 가드레일의 지주와 같은 강관 구조물의 근입깊이를 측정하고자 하는 연구이다. 이를 위해 진동센서를 캡이 아닌 측면부에 취부장치를 이용하여 설치함으로써 길이방향의 탄성파를 측정할 수 있도록 하고, 실제 구조물에 대해 측정을 실시하여 그 측정시스템의 성능과 유용성을 검토하고자 한다. 또한 다양한 길이의 실험용 강관 파이프를 매설하고 측정실험을 실시하여 측정시스템의 적용성에 대해서도 검토하였다. 본 연구를 통하여, 수신센서를 파이프의 측면에 선접촉하게 함으로서 종파를 감지하여 근입깊이를 포함한 파이프의 전 길이를 측정하는 본 측정시스템은 매설된 강관 구조물의 길이 측정에 기본적으로 적용 가능함을 확인할 수 있었다. 특히 오거 굴착으로 시공된 경우에는 높은 정도의 측정성능을 보여주었다. 또한 항타관입 파이프에 대해서는 지반의 영향을 고려함으로써 길이의 측정이 가능하다는 것을 확인할 수 있었다. 즉, 오거 굴착 또는 항타 관입 등 시공방법에 따라 측정결과에 대한 지반의 영향 정도가 달라지며 파형 분석 및 길이 산정시 그 영향을 고려하여야 함을 확인하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.201-209
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• 2015

The deformed degree of car body varies largely with the collision part from side collision of car-to-car. In case of deformation of car body caused by collision, the movement is different as speed energy changes to strain energy. Generally, in the analysis of traffic accident, the movement of car after the collision is analyzed by law of conservation of motion and the error of energy absorption rate along the deformation of car body can be calibrated by inputting coefficient of restitution, but it is current situation that coefficient of restitution applied by referring to the research results of forward collision and backward collision because the research results of side collision is rare. Vehicle model of finite element method applied by structure of car body and materials of each component was analyzed by explicit finite element method, and coefficient of restitution and collision detection time along contact part of side collision was drawn by analyzing the results. Analysis result acquired through the law of conservation momentum by applying finally-computed coefficient of restitution and crash detection time compared to collision result of actual vehicle. As a result, the reliability of analysis was higher than the existing analysis method were acquired when applying the drawn initial input value that used finite element method analysis model.

• Archives of design research
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• v.14 no.3
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• pp.145-154
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• 2001

These days, the products like Walkman, mobile phone, notebook PC, PDA are moving together with our body, and in the imaginary world like internet, our other self, Avatar is moving in place of our body on the cyber world. These products are related with our human body, and when considering the ones, attached to the human body, and having the meaning of mental combination like these, as the combination of the human and the products, it is necessary to examine these products in approaching them with respect to the combination relation between the human and the products. As a result of examining we can understand that the products, said to combine with the human body, are coming oui steadily. and recently, the inclination on the combination and the movement appears strongly. As this background, there are a breakdown of dichotomy thought, mixed sexual imitation, cyber culture, techno culture. concept of informative nomands, phenomenon which the division of human and machine becomes vague. and the miniaturization of products. imitation of human, phenomenon that the Inclination on the combination with human is more accelerated by networking. These products combine with human body at each wearing type in the various forms. Its functions become multi-layered, and closer to the human body physically. or its communication becomes high·graded and, they have the recombined form through the existing products which the human has And, they communicate each other. have the strong fashionable property, and the characteristics like the imaginary product to imitate the human body and substitute for the human behave.