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In recent years, with the growth of China's economy and the development of the automobile manufacturing industry, the number of various vehicles has continuously increased, and the incidence of traffic accidents has also increased. Especially in traffic blind areas, right-turning areas of vehicles, etc., traffic accidents such as vehicle collisions are extremely easy to occur, which poses a serious threat to people's lives and property, and is extremely harmful. Therefore, related research on collision detection of people and vehicles has been traffic-safe and has received extensive attention from field researchers. At present, the research on human-vehicle collision detection is to detect human-vehicle collision accidents by tracking the track of vehicles and pedestrians, but there are problems such as poor tracking effect, low accuracy of collision discrimination and complex algorithms. Aiming at these problems, this paper studies the human-vehicle collision detection algorithm based on image processing. Through the image processing of traffic monitoring video, the vehicle and pedestrian contour information is extracted. Based on this, a mathematical model for collision detection is constructed to realize human-vehicle collision detection. The results show that the proposed method can effectively distinguish the collision between pedestrians and vehicles, and the algorithm for image processing is simpler than the traditional tracking algorithm, and the time is shorter. The results show that the image-based collision detection algorithm based on image processing can effectively and quickly identify the traffic accidents in which people and vehicles collide, and then can issue alarm signals in time, shortening the accident processing time and reducing the accident time. The possibility of a secondary accident has a high practicability in the detection of traffic accidents in which people and vehicles collide. [ABSTRACT FROM AUTHOR]

The current refueling system of China Lead-based Research Reactor (CLEAR-I) is still in the developing stage and requires frequent changes of the refueling design scenarios. This paper presents a virtual simulation prototype which contributes to the complex refueling system for CLEAR-I. The proposed simulation system focuses on utilizing a desktop virtual environment to simulate the complex mechanical movement of triple crank connecting rod mechanism which consists of large rotating plug, small rotating plug and transfer machine. Main features of the proposed simulation system are: (1) automatic refueling scene modeling, (2) XML-based management for refueling scenario, (3) motion simulation and collision detection, (4) record and evaluation of refueling simulation process. The system architecture, features and capabilities of the developed virtual simulation prototype system were described. And the refueling simulation tests were carried out in order to meet the frequently updated engineering design for refueling scenarios of CLEAR-I. [ABSTRACT FROM AUTHOR]