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이영내(Youngnae Lee),박성지(Sungji Park),박종찬(Jongchan Park),이홍석(Hongseok Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
When there was a car accident involving a motorcycle, it is crucial to determine the velocity before the collision. The sliding motorcycle after a collision finally come to a halt because of kinetic frictional force that exists between the moving objects and the roads. If we know the total sliding distance of a motorcycle we can calculate the speed just before the collision by a simple physical formula. For that we should know the sliding frictional coefficients of the motorcycle on the sliding surface. In this paper we inferred sliding frictional coefficients of motorcycles under various conditions by pulling it. As various sliding conditions, three kinds of sliding surfaces, two kinds of pulling velocities and two kinds of motorcycles are applied for comparison. The results revealed that the factors are highly dependent on the sliding surface, and not as much in the conditions associated with velocity and motorcycle model.
이영내 ( Youngnae Lee ),박성지 ( Sung Ji Park ),정하린 ( Harin Cheong ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.7
Forklift is the vehicle that conveys loads and unloads them in industrial fields. There happens annually many accidents involved with the forklift which cost many lives. One of them is an accident due to careless driving Generally speaking when a driver leavers a vehicle, it must be in a state of complete halt. Otherwise, the vehicle on a gentle slope or by the driving power, without a controller(driver), rolls down the road and hit a pedestrian or a driver oneself. When it occurs, the victim was forced to die hit by the huge impulse of rolling vehicle which is caused by the heavy weights of ordinary cars. A forklift, for example, weighs over 3 tons. In this paper we analyzed an accident involved with a forklift. In the case when the forklift driver leaves a seat and in the process of getting out of the forklift, he may have pushed unintentionally the gear lever and letting the vehicle go without a driver. The forklift driver himself, the victim, was found dead compressed between the ongoing forklift and the container box. The victim has died from serious wounds he has received to his chest. We conducted a driving test with the accident forklift at the site. We let the forklift be in a state of forward gear and without acceleration. And then it was made to crash a silicone block leaning against the container box. The silicone dummy is a good substitute for the human chest. We could measure quantitatively the impulse and the dynamic force on the silicone block given by the forklift. The result shows that even a slow progressing vehicle could severely damage the chest of the human. The analysis agrees well with the autopsy report of the victim. And we finally, for the prevention of forklift accident, make a suggestion that a forklift should adopt the safety device such as a seat sensor which is highly urilized in heavy equipment vehicles.
최광복 ( Choi Gwangbok ),윤영내 ( Yoon Youngnae ),이상학 ( Lee Sanghak ),이상무 ( Lee Sangmoo ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
공용연수 15년인 PSCI형 교량의 역T형 교대에 측방유동과 같은 손상이 발생되어 원인분석을 실시하였다. 측방유동의 발생 원인과 영향 요소에 대해 분석하였다. 기초 보강 현황, 손상 진행 상황을 분석하고, 측방유동 평가 방법인 원호활동에 의한 방법, 측방유동지수 F에 의한 방법, 측방유동 판정지수 I<sub>L</sub>에 의한 방법, 수정 측방유동 판정지수 M<sub>IL</sub>에 의한 방법, 지반보강 고려시 측방유동 검토 등을 분석하였다.