1. What is security? What are the main means? What are the advantages and disadvantages of each? 2. What are the main electronic security systems? What are the specific classification

Security prevention system of the full name of the public *** security prevention system, is to protect the safety of personal property, information and communication security, to achieve loss prevention and crime prevention purposes.

A burglar alarm system

The burglar alarm system is installed in the protection of the site through a variety of intrusion detectors on the protection of the area of the detection of human activity (intrusion), once the intrusion is detected will generate alarm information to achieve the purpose of burglary prevention.

Two television monitoring system

The television monitoring system is to image surveillance as a means of real-time monitoring and video recording of the site image. Surveillance monitoring system allows security personnel to intuitively grasp the scene, and be able to analyze through video playback. Early television monitoring system is an important part of the application of television systems, but also an important part of the security system. The current TV monitoring system has been organically combined with the burglar alarm system to form a more reliable monitoring system.

Three entrance and exit control system

Entrance and exit control system, also known as the access control system, its function is to control the entry and exit of personnel, but also to control the activities of personnel in the preventive area. In the precautionary area, you must use all kinds of cards, passwords or through biometrics by the control device to identify the confirmation, in order to pass. Parking management system actually also belongs to the access control system.

Four building security intercom system

Building security intercom system for visitors and indoor personnel to provide two-way call or visual call, remote control locks and alarm functions.

Five electronic patrol system

In the large building or yard, many entrances and exits, the complexity of the people coming and going, there must be a special patrol, the more important places should be set up patrol station, regular patrol. The electronic patrol system is the security personnel in the specified patrol route, in the specified time and place to the center control room to send back the signal to show normal.

I. Basic Concepts of Security

● General Concepts of Security

According to the explanation of the Chinese dictionary now, the so-called security is no danger, no infringement, no accident; the so-called prevention is to be prepared and on guard, while preparedness refers to be ready to deal with an attack or to avoid being victimized, and on guard refers to defense and protection.

Consolidating the above explanations, is it possible to give the following definition of security precaution: to be prepared and protected to cope with attacks or avoid victimization, so that the protected object is in a state of security without danger, without aggression, without accidents. Obviously, security is the purpose, prevention is the means, through the means of prevention to achieve or realize the purpose of security, is the basic connotation of security prevention.

● Two security concepts

The Chinese word for security has two interpretations in English: Safety and Security. Oxford University published a modern advanced English-Chinese dictionary on the main interpretation of the word Safety is: safety, peace, security, insurance (locks), insurance (box), etc.; and on the main interpretation of the word Security is: safety, no danger, no worries, to provide security, so that exempted from the dangers or worries of the thing, collateral, collateral, security (police), security (troops), etc.

In fact, in fact, safety is a concept of security, and security is a concept of security, and security is a concept of security, and security is a concept of security, and security is a concept of security.

In fact, the Chinese word for security is a broad sense of security, which includes two meanings: one refers to the security of natural or quasi-natural attributes, which corresponds to the English word Safety, and the other refers to the security of social humanities, i.e., the security of obvious perceived attributes, which corresponds to Security. The destruction of the safety of natural or quasi-natural attributes is not mainly caused by the purposeful participation of human beings; the destruction of social humanities is mainly caused by the purposeful participation of human beings. Therefore, in a broad sense, security should include Safety and Security two layers of meaning, and we often say that security mainly refers to the narrow sense of security Security, foreign usually called "security".

● Loss prevention and crime prevention - the connotation of the duty of security

In the West, do not use the word "security", but with loss prevention and crime prevention (Loss Prevention & Crime Prevention) this concept. Crime Prevention ) this concept. Just as the Chinese security and prevention are used together to form a new compound word, in the West, Loss Prevention and Crime Prevention are also used together. Loss Prevention and Crime Prevention form two sides of the Safety/Security coin. Overseas, Loss Prevention is usually the focus of the social security industry, while Crime Prevention is the focus of police and law enforcement. It is the organic combination of the two that ensures the stability and security of society. In this sense, Loss Prevention and Crime Prevention are the essence of security prevention.

In summary, security prevention is both a public security business (police enforcement department), but also a social public **** business and social and economic undertakings. Their development and progress, both dependent on the development and progress of science and technology, and at the same time for the progress and development of science and technology to provide and create a favorable social environment.

● The concept of grand public **** security

The so-called grand public **** security concept is the integrated security concept, which is to provide comprehensive security services for social public **** security to provide security at all times and everywhere. The so-called social public **** safety services and security system, is initiated by the government, government organizations, all sectors of society (by no means the Ministry of Public Security a, much less an agency within the Ministry of Public Security law enforcement departments) jointly implemented comprehensive security system engineering (hardware, software) and management service system. The public need for integrated security, including not only anti-theft, anti-robbery, anti-intrusion, anti-vandalism as the main content of the narrow sense of "security", but also includes fire safety, traffic safety, communication safety, information security and human protection, medical assistance against gas leakage and many other content.

Two, the three basic means of security prevention: human, physical and technological defense

Security prevention is part of the social public **** security, security industry is a branch of the social public **** security industry. In terms of means of prevention, security prevention includes human prevention, entity (physical) prevention and technical prevention of three categories. One of the manpower to prevent and entity to prevent the ancient traditional means of prevention, they are the basis of security, with the continuous progress of science and technology, these traditional means of prevention are constantly integrated into the content of the new science and technology. Technology to prevent the concept of modern science and technology (initially electronic alarm technology) used in the field of security and gradually formed an independent means of prevention in the process of a new concept of prevention. Due to the continuous development of modern science and technology and popularization of the application of the concept of "technical precaution" is also more and more popular, more and more for the police and law enforcement agencies and the public recognition and acceptance, so that the frequency of use of a new vocabulary, technical precautionary content with the progress of science and technology and constantly updated. In the rapid development of science and technology in today's era, it can be said that almost all of the high-tech will be transplanted sooner or later, applied to security work. Therefore, the "technology to prevent" in the security technology in the status and role will be more and more important, it has brought a new revolution in security.

The three basic elements of security are: detection, delay and response. Detection (Detection) refers to the perception of the occurrence of visible and hidden risk events and issued a warning; delay (Delay) refers to the extension and postponement of the process of risk events; reaction (Response) refers to the organization of forces to stop the occurrence of risk events taken by the rapid action. In the three basic means of security precautions, to achieve the ultimate goal of prevention, should be around the detection, delay, response to the three basic elements of prevention to carry out work, take measures to prevent and stop the occurrence of risk events. Of course, the three means of prevention in the implementation of the process of prevention, the role played by different.

Basic human means of prevention (human defense) is the use of people's own sensors (eyes, ears, etc.) to detect, detect nuisance or sabotage of the security of the target, react; with sound warnings, intimidation, barricades, weapons and other means of delaying or stopping the danger to occur in their own power is not enough to send out a signal of help, in anticipation of further reaction to stop the danger from occurring or to deal with the the danger that has occurred.

The main role of physical prevention (physical defense) is to delay the occurrence of danger, for "reaction" to provide sufficient time. Modern physical prevention is no longer just a passive prevention of material barriers, but increasingly uses high-tech means, on the one hand, to make physical barriers less likely to be damaged, increasing the delay time; on the other hand, also make the physical barriers themselves to increase the function of detection and reaction.

Technical means of prevention can be said to be the human means of prevention and physical means of prevention of the extension and strengthening of the function of the human means of prevention and physical means of prevention in the technical means of prevention of supplementation and strengthening. It should be integrated into the human preventive and physical prevention, so that the human preventive and physical prevention in the detection, delay, response to the three basic elements in the middle of the increasing high-tech content, and constantly improve the ability to detect, delay and response capacity, so that preventive measures really play a role in achieving the desired purpose.

Detection, delay and reaction between the three basic elements are interlinked, indispensable relationship. On the one hand, the detection should be accurate, the length of the delay should be appropriate, the reaction should be rapid; on the other hand, the total time of the reaction should be less than (at most equal to) the total time of the detection and delay.

Three, security technology and security technology prevention

Security technology is used for security prevention of specialized technology, in foreign countries, security technology is usually divided into three categories: physical technology prevention (Physical Protection), electronic prevention technology (Electronic Protection), biometrics prevention technology (Biometric Protection). (Biometric Protection). Here the physical prevention technology mainly refers to the entity prevention technology, such as buildings and physical barriers and their matching physical facilities, equipment and products (such as doors, windows, cabinets, locks, etc.); electronic prevention technology mainly refers to the application of electronic security, communications, computers and information processing and its related technologies, such as: electronic alarm technology, video surveillance technology, access control technology, computer network technology, and its related software, systems and technology. As well as its related various software, systems engineering and so on. Biometrics prevention technology is the product of the combination of court science evidence identification technology and pattern recognition in security technology, he mainly refers to the use of biological features of the human body for security technology prevention of a special category of technology, now widely used fingerprints, palm prints, eye prints, voice prints and other identification and control technology.

Security technology prevention is to prevent the security technology as the guide, to prevent the human as the basis for prevention, to prevent the technical prevention and physical prevention as a means to establish a kind of detection, delay, reaction and orderly combination of security services to prevent the security system. He is to prevent loss and crime prevention for the purpose of a public security business and social public **** cause. For the police law enforcement departments, security technology is the use of security technology to carry out preventive security work of a public security business; and for the social and economic sectors, security technology is the use of security technology to provide the public with a security service industry. Since it is an industry, there must be product development and development, there must be a systematic design and engineering construction, service and management.

Four, the professional system of security technology

Security technology as a branch of social public **** security science and technology, with its relatively independent technical content and professional system. According to the current state of technology and future development of China's security industry, we can prevent the security technology in accordance with the subject specialties, product attributes and application areas of different classifications are as follows:

● Intrusion detection and burglar alarm technology

● Video surveillance technology

● Entrance/exit target identification and control technology

● Alarm information transmission technology

● Moving target anti-robbery, anti-theft alarm technology

● Community security and social assistance emergency alarm technology

● Physical protection technology

● Explosion-proof security checking technology

● Security network and system integration technology

● Security engineering design and construction technology

Because of the security technology is an emerging technology field in development, therefore, it is important for the company to develop a new technology to meet the needs of the market. As security technology is an emerging technology field under development, so the division of the above specialties only has a relative significance. In fact, the above professional technology itself, are involved in a number of different natural sciences and technology categories, they are intersecting and interpenetrating each other, the boundaries of the profession will become more and more inconspicuous, the same technology applied to different professions at the same time will be more and more.