• 한국안전학회지
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• 제34권5호
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• pp.144-152
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• 2019

According to the National Police Agency, point-to-point speed enforcement system is being installed and operated in 97 sections across the country. It is more effective than other enforcement systems in terms of stabilizing the traffic flow and inhibiting the kangaroo effect. But it is only 5.1% of the total enforcement systems. The National Police Agency is also aware that its operation ratio is very low and it is necessary to expand point-to-point speed enforcement system. Hence, this study aims to provide the expansion basis of the point-to-point speed enforcement operation through analysis of the quantitative effects and development the accident prediction model. Firstly, this study analyzed the effectiveness of point-to-point speed enforcement system. Naive before-after study and comparison group method(C-G Method) were used as methodologies of analyzing the effectiveness. The result of using the naive before-after study was significant. Total accidents, EPDOs and casualty crashes decreased by 42.15%, 70.64% and 45.30% respectively. And average speed and the ratio of exceeding speed limit decreased by 6.92% and 20.50%p respectively. Moreover, using the C-G method total accidents, EPDOs and casualty crashes decreased by 31.35%, 66.62% and 10.04% respectively. And average speed and the ratio of exceeding speed limit decreased by 3.49% and 56.65%p respectively. Secondly, this study developed a prediction model for the probability of casualty crash. It was dependant on factors of traffic volume, ratio of exceeding speed limit, ratio of heavy vehicle, ratio of curve section, and presence of point-to-point speed enforcement. Finally, this study selected the most danger sections to the major highway and evaluated proper installation sections to the recent installation section by applying the accident prediction model. The results of this study are expected to be useful in establishing the installation standards for the point-to-point speed enforcement system.

• 한국항행학회논문지
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• 제26권5호
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• pp.281-288
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• 2022

본 연구에서는 무게 약 1톤, 속도 약 100km/h에 달하는 멀티콥터 형 UAM(Urban Air Mobility)가 도심 지역에서 추락했을 때 발생할 수 있는 인명피해를 정량적으로 분석하였다. UAM 수요가 가장 많을 것으로 예상되는 서울지역의 인구밀도 및 건물 데이터 베이스를 기반으로 UAM 추락 시 충돌에 노출되는 인구를 도출하였고 멀티콥터 형 비행체가 제어 불가능한 상태에서의 무동력 추락을 고려하여 항력을 고려한 자유낙하 모델을 통해 UAM 추락 시 사고영향 반경을 계산하였다. 더불어, 사고영향 반경이 증가할 때 지상의 인명피해의 변화를 분석하였다. 최종적으로 서울지역에 대한 UAM 추락 시 지상 인명피해 맵을 생성하였고 서울의 대부분의 지역에서 UAM 추락 시 약 1~10명 내외의 인명피해가 발생할 수 있음을 확인하였다. 이를 통해 TLS (Target Level of Safety)를 만족하는 UAM의 고장률 요구사항을 분석하였다.