Safety precautions include human defense, physical defense and technical defense.
Manpower prevention is to use people's own sensors (eyes, ears, etc.) to detect, discover targets that hinder or destroy safety, and respond by using means such as sound warnings, intimidation, barriers, and weapon counterattacks. Delay or prevent the occurrence of danger, and send out a signal for help when one's own strength is insufficient, in order to expect further responses to prevent the occurrence of danger or deal with the danger that has occurred. Such as security, doorman, patrol, inspection, care, etc.
Physical prevention mainly refers to physical barriers such as buildings, walls, fences, doors, locks, and cabinets. The main function is to delay the occurrence of danger and provide enough time for "reaction". Modern physical defense is no longer the passive defense of simple physical barriers, but increasingly adopts high-tech means. On the one hand, it reduces the possibility of physical barriers being destroyed and increases the delay time. On the other hand, it also makes The physical barrier itself adds detection and response capabilities.
Technical prevention uses electronics, communications, computer and information processing technologies and related technologies, such as electronic alarm technology, video surveillance technology, entrance and exit control technology, biometric technology, computer network technology and various related technologies. Security prevention is carried out by technical means of security prevention such as software and system engineering.