• 한국ITS학회 논문지
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• 제15권5호
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• pp.54-61
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• 2016

본 연구는 차량-보행자 사고시 보행자의 신장에 따라 보행자의 두부가 승용차의 전면유리에 닿을 수 있는 최저 속도를 제시하기 위하여 수행되었다. 마디모(MADYMO) 프로그램을 사용하여, NF쏘나타 차량에 대하여 보행자의 신장을 160cm, 170cm 180cm로 구분하여 평가하였다. 평가 결과, 승용차의 최저 속도값은 보행자의 신장이 160cm인 경우 약 49km/h, 170cm일 때 약 41km/h, 그리고 180cm일 때 약 29km/h로 나타났다. 이러한 값은 승용차 대 보행자 교통사고에서 승용차의 전면유리에 보행자 두부의 충돌흔적이 있을 시 속도추정의 중요 자료로 활용할 수 있을 것으로 기대된다.

• 대한교통학회지
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• 제29권3호
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• pp.115-122
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• 2011

이 논문은 자동차의 급제동시 발생되는 스키드마크(skid mark, 활주거리)를 통해 제동직전 속도(Pre-braking Speed)를 정확히 산정하기 위한 방법론을 제시하고자 한다. 운전자는 전방에 위급한 상황이 전개되거나 불의의 사고에 처하게 되었을 경우 통상 급제동조치를 취하게 되며, 정지거리에 따라 사고를 당할 수도 있다. 자동차의 정지거리에 있어서 영향을 끼치는 요인은 운전자의 인지반응시간, 자동차 제동장치의 성능, 노면의 상태 등을 꼽을 수 있으나, 가장 중요한 요인은 제동직전 속도(Pre-Braking Speed)라고 할 수 있다. 현재 교통사고의 조사분야에서는 skid mark의 길이에 근거한 활주직전 속도(Preskidding Speed)를 산정하여 과속 여부를 판단하고 있으나, 정확한 사고원인 규명을 위해서는 불완전제동시간 동안 감속된 속도를 고려한 제동직전 속도의 산정이 필요할 것으로 판단된다. 따라서, 본 연구에서는 교통사고시 자동차의 정확한 속도정보를 산정하기 위한 방법을 제안하고자 하며, 또한 이 연구가 향후 교통안전차원에서 자동차의 특성을 이해하는데 있어서 일조할 수 있기를 기대한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.1005-1018
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• 2017

This paper proposes an App Visualization (AppV) based on IoT Self-diagnosis Micro Control Unit (ISMCU) for accident prevention. It collects a current status of a vehicle through a sensor, visualizes it on a smart phone and prevents vehicles from accident. The AppV consists of 5 components. First, a Sensor Layer (SL) judges noxious gas from a current vehicle and a driver's driving habit by collecting data from various sensors such as an Accelerator Position Sensor, an O2 sensor, an Oil Pressure Sensor, etc. and computing the concentration of the CO collected by a semiconductor gas sensor. Second, a Wireless Sensor Communication Layer (WSCL) supports Zigbee, Wi-Fi, and Bluetooth protocol so that it may transfer the sensor data collected in the SL to ISMCU and the data in the ISMCU to a Mobile. Third, an ISMCU integrates the transferred sensor information and transfers the integrated result to a Mobile. Fourth, a Mobile App Block Programming Tool (MABPT) is an independent App generation tool that changes to visual data just the vehicle information which drivers want from a smart phone. Fifth, an Embedded Module (EM) records the data collected through a Smart Phone real time in a Cloud Server. Therefore, because the AppV checks a vehicle' fault and bad driving habits that are not known from sensors and performs self-diagnosis through a mobile, it can reduce time and cost spending on accidents caused by a vehicle's fault and noxious gas emitted to the outside.

• 한국산학기술학회논문지
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• 제22권2호
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• pp.507-513
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• 2021

본 연구는 노면 흔적이 발생하지 않은 충돌 사고 사례를 중심으로 양 차량의 최종 정지 위치 및 자세, 차량 파손 부위, 노면 흔적, 차량의 제원, 충돌 각도. 충돌 속도, 제동 여부, 조향 여부 등의 자료를 토대로 교통 사고 분석을 위해 사용하는 차량 충돌 해석 시뮬레이션 프로그램인 PC-CRASH을 이용하여 시뮬레이션을 수행하였다. 차대 차 사고에서 충격 자세, 제동 여부, 최종 정지 위치, 충격 지점 및 충돌 속도는 사고 재구성을 위한 중요한 요소이다. 특히, 충돌 속도는 가장 중요한 쟁점이다. SM5와 렉서스의 충돌 속도는 각각 131km/h, 74km/h, SM5와 렉서스의 충돌각은 각각 0.91°, -161.07°으로 분석되었다. 사고 원인은 교차로를 통과하는 SM5가 최고 제한 속도를 61km/h 초과하여 렉서스의 좌회전 차로로 진입하였고, 렉서스는 충돌을 회피하기 위한 과정에서 충돌하였다. 시뮬레이션의 충돌 궤적 오차율은 약 1.4%이다. 사고 조사자의 주관적인 경험에서 벗어나 충돌 역학 및 차량 공학 측면과 시뮬레이션을 적극 활용하여 사실에 근접한 원인 규명을 제시하였다.

• Journal of Magnetics
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• 제21권2호
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• pp.249-254
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• 2016

Recently, electric vehicles have got significant attention because it is more eco-friendly and efficient than internal combustion engine vehicles. Instead of an internal combustion engine, the electric vehicle has a motor for propulsion. The permanent magnet synchronous motor which has permanent magnet instead of field winding in the rotor has especially higher efficiency and power density than other types of motor. When the irreversible demagnetization is occurred, drivers are exposed to high risk of accident by the fault operation of motor. Therefore, the irreversible demagnetization of permanent magnet should be detected to reduce the risk of accident. In this study, the demagnetization diagnosis method based on the result of locked rotor test is proposed. Based on short measurement time, the proposed diagnosis method aims to detect the demagnetization fault when an electric vehicle is at a complete standstill. The proposed method is verified through the finite element analysis.

• 자동차안전학회지
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• 제12권4호
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• pp.54-60
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• 2020

In a previous study, an investigation of occupant behaviors and injuries (to the head and chest) was performed during vehicle impact loading cases in order to ensure the safety of wheelchair passengers on a bus. The computational results showed overall safety tolerances of wheelchair occupants under different accident configurations. The bus crashworthiness is described as the capability of a bus to protect occupants during rollover loadings. The residual space containing occupants should be undamaged without any intrusions. However it is necessary to evaluate the residual space according to the bus occupant kinematic analysis under the rollover crash simulation. This study focuses on the evaluation of occupant behaviors during rollover loading cases in order to ensure the safety of bus passengers sitting in general seats and wheelchairs and evaluates the residual space of the bus by analyzing the bus occupant kinematics.

• 자동차안전학회지
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• 제14권4호
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• pp.21-26
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• 2022

Commercial use of autonomous vehicles is to come soon. So far most of responsibility of the accident is on the human driver with conventional vehicles whereas that will be on the car OEM and transportation related organizations with autonomous vehicles, which asks car OEM's and government to do vast study of car crash in various conditions. Test protocols need amendment and to be newly enacted to reflect new findings from the study aforementioned. Rigid stationary barrier and moving or stationary deformable barrier as well as car to car test which is same as actual accident can be utilized to simulate the crash happening on the road. Among those 3 test methods, rigid stationary barrier is most economic and has good repeatability. Limitation as well as advantage of the rigid stationary barrier is studied through comparison between car to car crash and oblique rigid barrier crash.

• 한국안전학회지
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• 제30권1호
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• pp.94-103
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• 2015

This study analyzes the influence factors on elderly pedestrian accident. Elderly people are easy to be badly injured by car accidents compared to younger people. Therefore, various plans and measures are required to protect elderly pedestrian from accidents. However, pedestrian accidents studies only focused on microscopic factors such as attribute of driver, pedestrian, road design. In order to prevent pedestrian accident and reduce the severity of the accident, not only microscopic factors but macroscopic variables such as urban planning and facility should be considered. In this regard, this study develops an ordered probit model introduced the characteristics of urban facility which were not considered in the previous studies. The result shows that there is higher level of accident severity in such areas as large commercial area, well-developed area with transportation infrastructure service and non-pedestrian safety zone. Thus, various and appropriate countermeasures should be prepared in order that pedestrian accident can be prevented in the areas mentioned above. In addition to the aforementioned variables, it is revealed that other variables including vehicle speed, gender and age of pedestrian, weather condition, type of vehicle, etc. partly affect the severity of pedestrian accident.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.490-492
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• 2021

우리나라는 교통사고 안전 사회 실현을 위하여 범정부 종합대책을 2017년에 마련하였으며. 도심 지역의 제한속도를 기존 60km에서 50km로 낮추고 어린이보호구역의 경우에는 30km로 제한하는 등 차량이 저속으로 운행하게 하여 어린이 및 노인의 보행 중 사고를 최소화하기 위한 노력을 기울이고 있다. 본 연구에서는 매년 어린이 교통사고 사고율이 높아지고 있는 특정 지역인 단양군을 지정하여 자동차 등록현황, 교통사고 공간데이터(GIS) 현황으로 각 데이터를 전처리 후 데이터의 구조를 이해하고 데이터의 구조적 패턴을 알아내기 위한 분석 연구를 하였다.

• 한국자동차공학회논문집
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• 제20권6호
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• pp.39-45
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• 2012

More than 80 percent of traffic accidents related with lane departure believed to be the result of crossing the lane due to either negligence or drowsiness of the driver. Lane-departure related accident in the highway usually involve high fatality. Even though LDWS is believed to prevent accident 25% and reduce fatalities by 15% respectively, its effectiveness in performance is yet to be confirmed in many aspects. In this study, the vehicle lateral locations relative to warning zone envelop (earliest and latest warning zone) defined in ISO standard, ECE and NHTSA regulations are compared with respect to various factors including delays, vehicle speed and vehicle heading angle with respect to the lane. Since LDWS is designed to be activated at the speed over 60 km/h, vehicle speed range for the study is set to be from 60 to 100 km/h. The vehicle heading angle (yaw angle) is set to be up to 5 degree away from the lane (abrupt lane change) considering standard for lane change test using double lane-change test specification. The TLC is calculated using factors like vehicle speed, yaw angle and reaction time. In addition, the effect of vehicle type has been considered to assess LDWS safety.