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First, the development and status quo of access control systems

With the acceleration of digital network development, the scope of networked products has been expanding, and access control systems have steadily moved deeper into the direction of TCP/IP networks from the traditional RS485 bus transmission method. The limitations of RS485 communication in terms of number of nodes, transmission distance, and communication speed limit its application, especially the application of large-scale access control systems. The access control system based on TCP/IP network communication has the advantages of no-node limitation, wide coverage area, fast communication speed, and small interference, and is fully ahead of the RS485 bus system, and it will naturally gain the favor of many users.

At present, some access control systems using external or built-in network converters on the market are actually intermediate devices using RS485 to TCP/IP, which is not a true network access control. The access controller used in the true sense of the network access control is generally implemented by a 32-bit ARM7/9 microprocessor.

The access control system adopting the full TCP/IP method can make full use of the established network resources, and the amount of new wiring works is small. It can be used across regions without distance limitation, and information transmission and storage capacity can be greatly improved. However, if the project does not have a network, the special installation of the network will increase the غير مجاز مي باشدt of the initial investment. At present, it is mainly used in large-scale systems with more than 100 doors.

Another aspect of access control system technology development is the integration of access control systems and other intelligent building systems. It is mainly integrated with video surveillance systems, intrusion alarm systems, perimeter detection systems, fire alarm systems, and building automation systems. This combination provides Effective structure to enhance each other's systems complement each other. For example, once there is an event that triggers an alarm, it will send a signal to the video surveillance system to provide real-time recording of the incident scene, and the linked access control system will block the corresponding access control channel.

Second, the access control system networking and network security technology issues 1. Networking and security
At present, there are two networking methods for network access control systems. One is the access control system based on RS485 bus networking. The other is the “IP network access control” of the network access control system. The “IP network access control” refers to the access control system of the access control controller and the access control server using the TCP/IP protocol.

In the past, most of us were concerned about the reliability of access control systems. At present, the security of access control systems has received more and more attention. In particular, the security requirements for access control systems of certain countries' confidential departments and confidential departments are even higher.

Compared with the traditional access control system based on 485 bus network, the advantages of IP network access control are mainly reflected in: (1) greatly improve the system response speed, for more than 100 access control points above the access control system, especially for video linkage requirements occasions, Should be preferred; (2) improve system reliability, RS485 twisted pair bus technology is mature, easy to use, but poor anti-jamming performance; (3) improve system scalability, IP architecture is more suitable for standardization of the system expansion, and off-site It is the best choice for networking users to use. (4) Improve the maintainability of the system. The IP network access control facilitates remote diagnosis and maintenance. Compared with the traditional access control system based on the 485 bus network, the IP network access controller should be higher than the RS485 access controller.

Regarding the network security of the two networking systems, any kind of network communication has the risk of being eavesdropped or modified by a third party. RS485 bus communication technology is simpler than the IP network access control using TCP/IP protocol networking. "Easier to be attacked.

The TCP/IP protocol is the most widely used network communication protocol and has powerful communication capabilities. However, TCP/IP protocol packets are easily monitored and intercepted by dedicated software during the transmission process. The TCP/IP protocol in the network is easily communicated by third parties. Eavesdropping or modification.

The main danger of this kind of threat is that the access authority in the access control system and the administrator's user information and password are easily intercepted. The most terrible danger is the possibility of legal communications being modified, the modified information being used for illegal access, and even blocking the interception of real-time alarm events, etc. will cause incalculable losses to the customer's security.

TCP/IP communication packets are intercepted and executed in many ways. Changing the direction of the mesغير مجاز مي باشدe causes the hosts on the network to change the address of the packets they send during the network session.

A spoiler interested in truncating a conversation may use one method to set up relays. A relay failure can occur anywhere in the network, even at a distance from the client system. The relay machine can adjust traffic in real time or record packets for later analysis. The relay machine can also change the content of the transmitted communication.

The method of obtaining the communication content only requires a passive packet monitor (often referred to as a "packet sampler"). The packet sampler can provide the logged network information to the deliberately destructive system security in a relay-broken manner.

Currently, 99% of the TCP/IP access control systems used in large-scale projects such as subways, banks, unattended equipment rooms, telecommunications power, and national government agencies have no anti-intrusion security mechanisms at the network layer. Since customers do not understand the potential risk of being hacked at any time, once attacked will directly threaten the normal operation of the customer; it will even result in major loss of personnel and property, so solving the security problem of TCP/IP access control system becomes anxious. The problem to be solved.

2. Application of Network Security Technology in Access Control System

At present, in order to ensure the security of data and communication in access control systems, the main network security technologies used are: security cryptography, counterfeit card protection technology, equipment authentication technology, intrusion detection, data transmission encryption technology, data storage, backup, and disaster recovery technology. Wait. The following lists the application of several common network security technologies in ensuring access control systems.

Borrow VPN Network Channel Method

Using this method of Figure 1, the threat of illegal computer attacks outside the VPN tunnel is resolved. The disadvantage is that there is also the possibility of illegal computer attacks from inside the VPN tunnel.

Using the method shown in Figure 2 for each controller with an independent VPN device, the advantage is that each device in the system has an independent security channel, effectively solving the threat of internal and external computer attacks. The disadvantages are very high investment غير مجاز مي باشدts and high maintenance غير مجاز مي باشدts.

High-security encryption technology of the network door vegetable equipment

Such as Siemens company's SIPASS access control system, this type of product communication service uses SSL encryption technology, communication service software and management of customer full and controller communication between all through SSL encryption, decryption, authentication and other strict security detection mechanism To be done.

At present, online banking security encryption uses SSL encryption technology. The comprehensive system security mechanism in this kind of access control system products ensures the security of customers in complex network environments. It is characterized by satisfying customers' high security of the entire system. The requirements are relatively غير مجاز مي باشدt-saving, and can also significantly save on subsequent use and maintenance غير مجاز مي باشدts. This is a very valuable option.

Third, the integration of access control systems and other systems and information sharing

With the rapid development of digital networking and intelligent building technologies, the integration of access control systems with other systems will become even closer, and the scope will become wider and wider, infiltrating into all areas of society and playing an increasingly important role. In addition to access control, attendance, documents, patrolling, dining, consumption, fitness, medical care, parking, book materials, meeting attendance, visitor management, elevator control management, office equipment management, club entertainment, three forms and property payment, etc. Also with other intelligent systems necessary integration and linkage, such as anti-theft alarm, closed-circuit monitoring, fire alarm, and even building automation systems.

In addition, the system will also make data interfaces with systems such as ERP, such as attendance, payroll, and personnel management.

The network access control system has the following features:

Data sharing: Utilize system resources to speed up data exchange.

Real-time monitoring: Real-time monitoring of all terminals in the system.

Quick Search: All records can be retrieved at one time in the same database, improving efficiency and accuracy.

Comprehensive statistics: All statistical reports can be completed in the management center.

Convenient management: Management of all systems can be completed in the management center.

With the development of building intelligent systems, the integrated management of network access control and card systems is already a general trend. The simple “card” can no longer satisfy the actual needs of the society, but requires a seamless link within the card system, and External linkage of other intelligent systems.

There are two main ways to implement the linkage between the access control system and other systems

The first is the hardware method
That is, the access control system outputs the relay dry contact to the matrix alarm input module of the analog television monitoring system and the alarm input of the DVR, so as to realize the image capture and monitoring functions of the controlled door point or related parts. This kind of integration method is the most commonly used and the most basic one in the past. However, the problem is that afterwards, it can't be queried through more efficient means. At the same time, installation and debugging are quite troublesome.

The second is software

The access controller with digital video server (encoder) function supports the dual data exchange function from the device protocol layer to the software database layer simultaneously with the digital monitoring system. Another method is to directly integrate the program of the access control management system software in the SDK of the DVR video capture card, and connect the DVR equipment through the access control system software function item. The above two software methods have their advantages and disadvantages. The advantage of the former is that the system responds quickly and there is no delay. The disadvantage is that the video data must be stored in the local management host, and the capacity of the host hard disk must be high. The latter has the advantage that the local management host does not need to save the video stream data, and only needs to call the data in the remote DVR when needed. The disadvantage is that the associated video will have a delay of about 1-3 seconds and cannot be abnormal at the channel. The previous video was called. In addition, there is also a software approach that is integrated by an intelligent system platform. This software is provided by the equipment provider's OPC standard interface or data development package, and then developed by a professional software vendor, in the third-party software. Show in and out of data and video information, such software also integrates various systems to achieve the purpose of unified management, the drawback is a long development cycle.

Fourth, the development trend of network access control system

In summary, the networked access control refers to the access control system based on TCP/IP communication. The advantages of the access control system adopting the TCP/IP communication protocol are that the communication speed is fast, the network is not limited by the distance, the network resources are easily obtained, and the system can be managed. Because of the large number of devices, access control devices that use this protocol as a networking mode have become mainstream products for large-scale access control system projects and remote management access control system projects. Compared with the traditional access control, it has greatly improved the communication and real-time monitoring, data transmission, networking and other aspects, and improved the shortcomings of the lack of real-time RS485. It has already broken through the early single RS485 bus to access up to 128 The limitation of the station controller is changed from a bus network to a star structure. Any problem at any point will not affect the system. The system failure is also easy to find and eliminate.

Undoubtedly, with the continuous development of intelligence, integration and networking in the security industry, the access control system will embark on a brand new road, complete with security video surveillance systems, anti-theft alarm systems, and fire alarm systems and building automation systems. Taiwan has become a development trend; in addition, information sharing and seamless integration between building and architecture intelligence subsystems will surely be the direction of development of access control systems.

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Intelligent video analysis is a hotspot in current security technology application, but some factors restrict the popularization and application of security intelligent video analysis technology. Therefore, this paper specifically analyzes the deep application bottlenecks of security intelligent video analysis technology and proposes corresponding countermeasures.

With the promotion of safe city construction, the application of security video surveillance has become increasingly popular. With the rapid expansion of the security video surveillance system, traditional manual monitoring has been difficult to meet the actual needs of security in terms of abnormal goals, behavior, event recognition efficiency, accuracy, real-time and so on. The advanced concepts and innovative application modes of security intelligent video analytics application technology are refreshing. However, after nearly ten years of development, there is still a huge contrast between its actual application results and user expectations, and it has almost fallen into the deadlock of “a thousand functions of product features, poor depth of application, and chaotic market supervision”. How to break through the bottleneck of the application of intelligent video analytics for security, requires market surveillance, product development, system integration, and professional users to work together.

Security Intelligent Video Analysis Technology Introduction Basic Concepts

Security intelligent video analysis technology originated in computer vision technology. It comprehensively applies techniques such as image enhancement processing. Based on the separation of goals and backgrounds, the target characteristics information is compared with pre-set templates or rules to automatically identify interest. The target, behavior, event, or data generates an alarm, and if necessary, the abnormal target can be automatically tracked and linked with other security facilities, significantly improving the overall efficiency and capability of security prevention and control. At the same time, the use of security intelligent video analysis technology in massive historical video information to achieve intelligent query search based on time, location and semantic characterization, can provide efficient verification means for the reconnaissance office.

Basic Architecture Security The overall architecture of the intelligent video analytics application system consists of the following three modes:

Front-end embedded deployment mode: The intelligent analysis function module is placed in front of a video capture front-end device, and a shared camera image processing chip or dedicated high-performance DSP is used as an intelligent analysis engine to realize intelligent analysis of abnormal targets, behaviors, and events. This kind of architecture is not affected by the image transmission link, which eases the pressure of video transmission and background storage. At the same time, intelligent analysis using uncompressed original images has good real-time performance, strong pertinence, and ease of deployment on a large scale. The disadvantage is that it is difficult to support complex intelligent analysis applications, and due to the pressure of front-end processing, higher requirements are placed on the integrated heat-dissipation process and stability of the front-end device, and it is relatively easy to be constrained by environmental factors. In addition, the front-end embedded intelligent analysis software is difficult to upgrade, and to some extent, the difficulty and غير مجاز مي باشدt of installation, commissioning, operation and maintenance are increased.

Background server deployment mode: Intelligent analysis applications are implemented through dedicated servers (groups) or dedicated clients deployed in the security monitoring center. This architecture effectively solves the inconsistency of the front-end processing capabilities. It can implement complex target, behavior, and event intelligence analysis through powerful background processing capabilities; facilitates integration with other professional application systems and expands the scope of smart analysis applications; intelligent analysis engine background running environment Guaranteed, system work stability is greatly improved, and it is convenient for intelligent analysis software upgrade, effectively reducing the pressure of system operation and maintenance. In short, this architecture is suitable for phased fixed-scenario intelligent analysis applications (such as large-scale event security), but it requires high performance for back-end server configuration. The level of intelligent analysis is easily limited by the bandwidth of image transmission links, and real-time performance is not ideal. Large-scale smart analytics applications can't be done.

Distributed hybrid deployment mode: Place some relatively simple video pre-processing functions on the camera (or video server) to complete the extraction, packaging, and sending of target feature data. The background intelligent analysis engine is responsible for receiving target feature data, completing and presetting rules. Or modules analyze and compare and automatically generate alarms. This architecture reduces the pressure on the front-end intelligent analysis. The back-end server only needs to analyze the target data, and it is convenient to integrate with other professional application systems. It improves the efficiency and capability of intelligent analysis and is more suitable for large-scale, high-performance intelligent analysis applications. However, the system The overall غير مجاز مي باشدt of deployment and operational maintenance pressure cannot be underestimated.

basic skills

Abnormal target recognition tracking. Identify, lock and track abnormal dynamic targets that occur in a specific period of time and in a specific area, and automatically record their movement trajectories.

Abnormal events, behavior identification alarm. Identify abnormal events or behaviors such as cross-border, legacy, stranded, stranded, fall, trail, fight, steal, and gather within a specified area and automatically report an alarm. Feature data acquisition. License plate recognition, face recognition, traffic flow monitoring, and real-time monitoring of crowdedness in public areas.

Massive video smart search. According to the semantic description of the target, behavior, and event features, and the auxiliary information such as location and time of the comprehensive event, the video information needed in the massive historical video information is automatically searched to improve the efficiency of the investigation of the staff of the department's investigators.

Security Intelligent Video Analysis Technology Application Status

At present, the application of security intelligent video analysis technology mainly focuses on urban public security management (such as public security bayonet information identification, crossing vehicle inspection and control, Internet cafe face comparison, etc.), and large-scale event security (such as the Shanghai World Expo campus entrance and exit portrait collection and comparison, virtual Waterfront electronic fence, etc.), management of the prison and other business areas. The comparatively successful application model is based on feature data acquisition comparisons. At the same time, in the surveillance sites where monitoring scenes are relatively fixed and lighting conditions are better, the intelligence of the objects, events such as illegal cross-border, overtime detention, confrontation, abnormal aggregation, etc. is supervised. Analyzing the alarm application has achieved certain results.

As far as the overall application level is concerned, due to factors such as the effectiveness of intelligent analysis algorithms, the complexity of the background, and the uncertainty of lighting conditions, the intelligent video analysis application of abnormal targets, behaviors, and events in complex open environments is still more challenging than the practical requirements for distance security. Big gap. The license plate recognition rate of the security bayonet and city road crossing is relatively high (more than 90%), but there is still much room for improvement based on the depth application of license plate recognition. Static portrait matching technology can achieve more than 90% accuracy in comparisons when the quality of the comparison source and comparison target is relatively high (such as portrait photos provided by second-generation residents), and it has higher actual combat applications. Value, but the real-time comparison technology for face collection in the open environment is limited by many factors such as site lighting conditions, “blacklist” quality, and the degree of cooperation, and the accuracy ratio is about 60-70%. Currently, it can only be deployed as a large-scale event in real time. Aids.

The main factors that restrict the application of intelligent video analytics in security
The lack of illumination at night in the open environment, bad weather (fog, snow, rain, dust, etc.), image compression processing, and the limited bandwidth of the network transmission link have caused image quality to decline, which has brought inherent difficulties to security intelligent video analysis; Complex anomalous behaviors and event modeling are difficult, and the corresponding intelligent analysis algorithms do not have high recognition performance. Targets are too close to the background or the background is cluttered, which leads to difficulties in target segmentation and feature information extraction. The moving target is blocked by the background and multiple moving targets obstruct each other. Target feature information is incomplete. The above factors are likely to cause adverse consequences such as false alarms, missed alarms, and tracking difficulties, which will severely restrict the actual combat performance improvement of the security intelligent video analysis application system.

The efficiency of the embedded intelligent video analysis algorithm based on D1 or HD resolution is not high, leading to the shortage of front-end DSP hardware resources, lack of front-end equipment integration, and lack of heat-dissipating technology to further limit the performance of DSP. The hardware processing capability and stability of the embedded intelligent analysis engine have been improved. It has become another major factor that restricts the application level of security intelligent video analytics.

Due to the fact that most of domestic security intelligent video analysis application products are from foreign manufacturers, and there is no scale application effect, the product pricing is generally abnormally high; manual calibration, background software debugging and other workloads during the implementation of the project are large, and some high-end product debugging even The need for direct participation of foreign manufacturers and technical personnel, coupled with the relatively high failure rate of embedded front-end equipment, makes it difficult to implement remote maintenance such as fault diagnosis and software upgrades, leading to high operating and maintenance غير مجاز مي باشدts for application systems. The above factors result in the low غير مجاز مي باشدt performance of security intelligent video analysis applications, which severely limits the effective promotion of security intelligent video analysis applications.

Mechanism level

At present, the construction of the security video surveillance system is still at an extensive stage of scale expansion. As the main unit of construction, security users are still paying more attention to the "monitoring coverage rate," and the degree of attention to prior warning is not enough. The direction of intelligent video analysis is The investment in R&D funding is also obviously insufficient.

Security intelligent video analysis product development lacks effective mechanisms. On the one hand, most security users do not seriously sort out application requirements. On the other hand, the product R&D department lacks an in-depth understanding of the security industry, resulting in intelligent video analysis products that have a thousand functions and lack of targeting. ***. At the same time, most system integrators do not give full play to the bridge between product R&D and users. Some integrators even exaggerate the functions of intelligent video analysis products and seriously damage the market image of intelligent video analysis products.

In addition, from the perspective of market supervision, due to the lack of authoritative standards certification system, users can not effectively measure and control the product performance, and seriously affect the user's confidence in the application of security intelligent video analysis.

The main countermeasures to promote security intelligent video analytics applications

Focus on the support of local R&D forces and focus on key technologies

In order to cope with the current situation in which security and intelligent video analytics applications rely heavily on foreign technology, and at the same time effectively stop the inefficient research and development of simple imitation and repeated investment, it is necessary to carefully organize local professional research institutes to focus on basic and common key technologies to break through security. Intelligent video analysis depth application creates conditions.

Efficient intelligent video analysis algorithm: Improved target segmentation, feature extraction, target recognition, and dynamic tracking algorithms based on complex scenes (such as varying lighting conditions, closeness of target and background colors, background clutter, targets blocked by background, and changes in monitored field of view) Performance improves the capacity and effectiveness of static object libraries and dynamic rule bases, reduces the occupation of hardware computing resources, and improves the accuracy and real-time performance of automated analysis of complex targets, behaviors, and events for open, complex, and large-scale monitoring areas. At the same time, the overall structure of the intelligent analysis software is increased to effectively take into account the real-time and robustness of the intelligent video analysis software, and meet the intelligent analysis requirements for different resolution video streams such as SDTV and HD, making the intelligent analysis software architecture more rational and efficient; Based on the automatic calibration technology of target characteristics, the ability to adaptive "learning" of back images is enhanced, the probability of false alarms is reduced, and complicated manual calibration is avoided, the difficulty of system debugging is reduced, and the maintainability of the system is improved.

Image acquisition and comparison technology: Further improve the algorithm for image acquisition and comparison based on open space and no-match conditions, eliminate the influence of unfavorable conditions such as complex and changeable on-site lighting and free movement of personnel, improve the accuracy of real-time comparison of the system, and improve In fact, the application value of warfare is used to improve the availability of backstage portrait storage data by automatically eliminating algorithms such as redundant portrait data; and to improve the reliability and real-time performance of automatic search and query comparison of static hetero***ual portrait targets based on large-capacity portraits. In addition, we will increase the research and development of portable and transportable portrait collections compared to terminals, increase suspicious target maneuver control capabilities based on portrait collection and comparison technologies, and vigorously expand the application of portrait acquisition and comparison technologies in the practical application.

Massive video intelligent search technology: further improve the performance of the video semantic analysis (including the semantic feature extraction of video, multi-granular event representation, etc.) algorithm performance, and improve massive video intelligent search based on target or event semantic description and event time, place, region, etc. Real-time and accuracy, while providing mobile target trajectory analysis and display; accelerate the development of portable intelligent video search and comparison of terminal equipment, facilitate the search and investigation of departmental reconnaissance personnel on the independent storage of historical video search, improve the efficiency of video forensics.

Blurring image processing technology: Based on the selection of low-lightness, high-definition cameras and bandwidth of the transmission network as much as possible, further increase the development of fuzzy image processing technologies based on image enhancement, image restoration, and super-resolution reconstruction to improve the weather. The blurry image processing capabilities caused by the target motion, the defocusing of the optical lens, etc. lay the foundation for the subsequent application of intelligent video analysis.

Increase demonstration application efforts to enhance the level of intelligent video analytics applications in actual combat

The key to the breakthrough of security intelligent video analytics level lies in application. Only through actual combat can system performance be truly verified and continuously improved. As a security department, we can neither regard intelligent video analysis technology as an omnipotent "magic bullet", and we should not adopt a passive and passive attitude. Instead, we should actively and steadily improve security based on the application strategy of "demand traction and demonstration first." Video analytics application level. According to the development status of the security intelligent video analysis technology, combined with the urgency of security business requirements, priority can be given to the following demonstration applications:

First consider the occasions where the monitoring scene is relatively fixed, the lighting conditions are easily secured, and the target and behavioral information are highly identifiable (such as inside large-scale event security areas, indoor ATM machines, and prisons, detention centers, detention centers, interrogation rooms, etc.) Carry out automatic analysis of alarming applications of abnormal targets, behaviors and events to improve the safety management and control capabilities of closed environmental areas; develops and implements massive data back-end mining and intelligent association analysis applications such as public security bayonet information identification, electronic*, and city-level crossings, vehicle and vehicle inspection and control, etc. Security check and control capabilities of security bayonet and city road crossings; promotion of large-scale event security zone entrances and exits, railway station high-speed trains (EMUs) passenger self-entry pasغير مجاز مي باشدes, metro station underground pedestrian pasغير مجاز مي باشدes, and other area portrait collection and comparison demonstration applications. The personnel in the public agglomeration area have suspicious target deployment capabilities.

Secondly, intelligent target analysis based on complex backgrounds or scenarios, behavior, and event intelligence analysis are the difficulties in the application of security intelligent video analytics, and it is also a key area for security application. Therefore, under the premise of effective breakthroughs in the development of key technologies such as efficient intelligent video analysis algorithms, it is necessary to selectively select intelligent video analysis depth applications in areas with high crowd concentration and complex public security situations in order to enable intelligent video analytics applications. We will make substantial progress as early as possible in the critical areas of security operations and create necessary conditions for large-scale application of security intelligent video analytics.

Actively explore and practice, strive to break through the traditional mechanism constraints

Innovative product development mechanism. The performance of intelligent video analysis products is highly related to the characteristics of industrial applications. Considering the particularity and sensitivity of the security industry, if the traditional market independent R&D model is used, it is difficult for professional R&D institutions to accurately understand and grasp the complex business needs of security departments. It is also difficult to truly meet the security requirements. In view of this, it is necessary to innovate the “triangulation, integration, and user” tripartite cooperation mechanism in the form of a “joint key laboratory for smart video analytics application technology” based on the principles of “benefit sharing and risk sharing”. In the cooperative R&D process, security users mainly actively involved in the product R&D process by combing application requirements, organization and demonstration construction, and coordinated performance improvement; professional R&D institutions are working hard to improve intelligent video analysis algorithms based on a thorough understanding of security business requirements. Performance improves real-time performance and reliability while reducing the probability of false alarms and false negatives in the system. At the same time, it improves the غير مجاز مي باشدt-effectiveness of intelligent video analysis products. System integrators maximize their performance through camera selection, supplemental lighting, monitoring angle adjustment, and calibration. Provide high-quality surveillance images, highlight monitoring target feature information, and create basic conditions for intelligent video analytics applications. Through the above-mentioned cooperation mechanism, it promotes three-way benign interaction and leads the right direction of security video analytics R&D and application. More importantly, through the sharing of intellectual property rights and research results by security users, the غير مجاز مي باشدt of system construction can be effectively reduced, and the inherent enthusiasm, initiative, and creativity of security users can be fully mobilized to accelerate the promotion and application of security video analytics applications.

Expand funding support channels. At present, smart city construction based on core supporting technologies such as the Internet of Things has entered a substantial start-up phase in many domestic cities. Smart security is one of the key applications for the demonstration of Internet of Things, and it has also been included in the scope of smart city construction. Therefore, in order to effectively solve the problem of high price for security intelligent video analysis products due to insufficient application scale, it is possible to build “government scientific research funding support through security users, R&D institutions, and integrators jointly applying for key technology research and demonstration application projects. The company's own funds supporting the "financial security model, expand key technology R & D and demonstration application funding support channels, reduce the pressure of professional R & D funding.

Accelerate the development of standards and norms. The security market management department took the lead in integrating product R&D departments, engineering integrators, third-party testing organizations, and security professional users, and accelerated the research on the development of a standard system framework for security intelligent video analysis applications, from basic functions and overall technical performance requirements to application systems. The corresponding technical standards are compiled in terms of architecture, performance level classification, and detection and authentication methods. At the same time, through the establishment of an “Intelligent Video Analysis Product Certification Testing Center” and other entities, the authority and operability of intelligent video analysis performance authentication are improved. The market access and daily supervision system will be further improved to create a standardized and orderly market environment and promote “protection and protection” for the application of security intelligent video analytics.

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The Bluetooth function of the mobile phone can turn off the TV screen (turn on the screen to listen to song mode) so that the Harman Kardon audio can be played independently. In addition, with the sound return technology, wearing headphones can completely focus on the fun of watching movies, completely free from outside influence.

Third, the color quality

The C2 Theatre TV uses the QUHD picture quality engine and full ecological HDR technology, which is equivalent to professional color adjustment and dynamic dimming in PS. Through the integration of hardware, software, and content integration problems, we provide advanced HDR solutions - full ecological HDR. On the one hand, to achieve a wider and more precise color gamut coverage, accurate color reproduction; the other hand, the picture has a higher latitude, showing the details become more clear. The summary of the live experience is that the picture quality is gorgeous and the details are not distorted! It is worth mentioning that C2 is also equipped with MEMC motion compensation technology, even if the 4K video is very high, it can also ensure that the motion in the picture is not smudged.

Fourth, border screen

The C2 Theatre TV screen impressed me. Even when the screen is off, you can't help but see two more eyes and then use your hand to confirm if the border disappears. This border is really too narrow! This equilateral and narrow edge design greatly reduces the constraints on the field of vision. It uses the CNC 1mm diamond cutting process + wire drawing process, which is solid and strong, producing a bright metal texture.

Fifth, the external interface

In terms of interfaces, the C2 is equipped with three HDMI, one USB2.0 USB3.0, one network interface, one digital audio interface, and one set of traditional AV interfaces.

Six, remote control design

The key remote control that won the 2017 German iF design award is easy to pick out faults, polymer materials, full ergonomic grip, lightweight and compact, and user-friendly button layout, and smooth blind control actually let me Feel refreshing fun. The remote control also integrates five functions of controlling the set-top box, game controller, air mouse, somatosensory manipulation, and voice manipulation. The utility is still very good.

Seven, voice control

Experienced a voice control, its high recognition rate and speed, make people hooked, as long as it is a popular title you shouted, the voice system can feedback accurate results in about 1 second, do not want to touch Pinyin. In addition, it also supports global control, such as controlling the volume, brightness, fast-forwarding in the video state, and then voice switching to play music, check the weather, check the stock market, and even a round of play is not a problem, fast response and considerate!

Eight, wireless screen

The large screen of the TV combined with the flexibility of the mobile phone can display any video or audio resource of the mobile terminal online or locally through the large screen of the TV. This is the advantage of the wireless screen. For example, a travel video that can't wait to be shared, an electronic remix made by a netizen, or a wonderful picture from Weibo, and shared on a big screen, letting people in the house feel the pleasure of watching. In addition, APP has also set up a wealth of online resources, and supports the shake of smart push, virtual remote control, mobile phone voice control.

Nine, you can bind WeChat

WeChat has become more interesting on the C2 theatre TV. The TV can be combined with WeChat to receive WeChat mesغير مجاز مي باشدes (text) from the mobile phone.

Ten, video call

The TV also supports video calls. Even if you work in a foreign country, you can communicate with your family “face to face”. The user can connect to the TV through the mobile phone Bluetooth in the "home circle". The dynamic picture taken by the mobile phone is presented on the TV screen and the TV can be equipped with a camera.

Eleven, the system is more concise

The latest version of the TCL TV+OS 3.0 system comes with the C2 theatre TV. The operation is more concise and the interface is flatter than in the 2.0 era. The TV uses the MSM838A processor (1.7GHz) and 2GB of operating memory. The silky smoothness made me feel good, there was no Caton in the switching interface and the normal operation, and the layout of each interface could be re-typed, so I had more initiative.

The film and television platform uses Tencent's domestic first-line video, and hundreds of thousands of hours of massive resources are enough for you to stay at home and watch the latest movies and television updates every day. Penguin Cinema, 4K Zone, HDR Zone, DTS Zone and other resources The coverage is also very wide. To cater for users with different needs and ages, TV+OS 3.0 also provides live and consummate living services such as live shows, hot variety shows, NBA events, lifestyle shopping, AR/VR games, C sports, K songs, and apps.

to sum up:

The TCL C2 Theatre TV has a minimalist European style design and exquisite body craftsmanship. QHUD image quality engine + full ecological HDR technology ensures accurate color reproduction, and restores details in real life. Harman Kardon Audio has redefined the high quality sound on the TV with its excellent tri-band performance and powerful surround sound. The human-computer interaction is no longer a single, intuitive and easy-to-use and resource-rich TV + OS 3.0 system, accurate recognition of the voice assistant, multi-screen gameplay interaction, sound backhaul technology, etc., each of which allows users to put it down.

High Frequency Inverter Charger

High Frequency Inverter Charger,High Frequency Inverter Transformers,Inverter Charger,High Frequency Car Power Charger

SUZHOU DEVELPOWER  ENERGY EQUIPMENT  CO.,LTD , https://www.fisoph.com

The relay is a kind of electrical appliance that controls or protects the task by turning on or off the control circuit according to external input signals such as changes in electrical quantity (voltage, current) or non-electrical quantity (heat, time, speed, etc.) There are three basic parts, namely the sensing mechanism, the intermediate mechanism and the executing mechanism, and the article describes the troubleshooting methods that they produce.

1, the maintenance of the sensing mechanism

For electromagnetic (voltage, current, intermediate) relays, the sensing mechanism is an electromagnetic system. The faults of the electromagnetic system are mainly concentrated in the coil and the moving and static core parts.

(1) Troubleshooting coils

Coil failure usually has damage to the coil insulation; the formation of a short circuit or ground due to a mechanical injury; due to the power supply voltage is too low, static and dynamic iron core contact is not tight, so that the current through the coil is too large, the coil heat to burn. When it is repaired, it should be re-wound. If the armature does not pick up after the coil is energized, it may be that the coil lead-out line is disconnected and the coil is disconnected. Check out the drop off after welding.

(2) Iron core troubleshooting

Core faults are mainly due to the armature not being able to suck up after being energized. This may be due to a broken coil, foreign matter between the moving and stationary iron cores, and low power supply voltage. Should be repaired in different situations.

After power on, the armature is noisy. This may be due to the fact that the contact surfaces of the moving and static cores are not even or have oil contamination. When repairing, the coil should be removed, flattened or flattened its contact surface; if there is oil, it should be cleaned.

The noise may be caused by a short circuit or a broken ring. Repair or replace the new short circuit ring.

After the power is cut off, the armature cannot be released immediately. This may be caused by the moving iron core being trapped, the air gap of the iron core being too small, the strain of the spring and the contact surface of the core being oily. Maintenance should be treated differently for the cause of the fault, or adjust the air gap to protect it at 0.02 ~ 0.05mm, or replace the spring, or use gasoline to clean the oil. For thermal relays, the sensing mechanism is a thermal element. Common faults are burnout of the thermal element or malfunction or failure of the thermal element.

(1) The thermal element is burned out. This may be due to a short circuit on the load side or a high frequency of operation of the thermal element. The thermal element should be replaced during the inspection and the setting value should be readjusted.

(2) The thermal device malfunctions. This may be due to the fact that the setting value is too small, the action is not overloaded, or there is a strong shock and vibration in the use case, which causes the action mechanism to loosen and trip and cause a malfunction.

(3) The thermal element does not operate. This may be due to the fact that the setting value is too small and the thermal element loses its overload protection function. During the overhaul, the setting current should be adjusted according to the load operating current.

2, the implementation of the overhaul

Most relay actuators are contact systems. Through its "pass" and "off", to complete certain control functions. Faults in contact systems generally include contact overheating, wear, and welding. The main cause of contact overheating is insufficient capacity, contact pressure is not enough, the surface is oxidized or unclean; the main cause of increased wear is the contact capacity is too small, the arc temperature is too high to make contact metal oxidation, etc. The main reason for welding is arc temperature is too high, or the contact is severely beaten. The contact maintenance sequence is as follows:

(1) Open the cover and check the contact surface condition.

(2) If the contact surface is oxidized, the silver contact may not be repaired, and the copper contact may be smoothed or lightly scraped off the oxide layer on the surface with a knife.

(3) If the contact surface is not clean, it can be cleaned with gasoline or carbon tetrachloride.

(4) If there are burn scars on the surface of the contacts, the silver contacts may not need to be repaired, and the copper contacts may be repaired with a glittering or knife. It is not allowed to use abrasive cloth or sandpaper for refurbishment, so as to avoid residual sand particles and cause poor contact.

(5) Contacts If welding, replace the contacts. If the contact capacity is too small, replace the relay with a large capacity.

(6) If the contact pressure is insufficient, adjust the spring or replace the spring to increase the pressure. If the pressure is still not enough, replace the contacts.

3, the overhaul of the intermediate institutions

(1) For air-type time relays, the intermediate mechanism is mainly airbags. The common fault is delay time. This may be due to loose airbag seal or leak, so that the action delay is shortened, or even not delayed; may also be airbag air channel blockage, so that the action delay becomes longer. When repairing, the former should be reassembled or replaced with a new one. For the latter, the air chamber should be disassembled to remove the blockage.

(2) For speed relays, the bakelite pendulum is an intermediate mechanism. If the motor can not stop when the brake is reversed, the bakelite pendulum rod may be broken. It should be replaced when overhauled.

Pre Rinse Faucet

Bestware Pre-rinse Faucet brings the fine design and high technology together in all areas of the product process beyond  Sink Faucet , Commercial Faucet and Commercial Kitchen Faucet. With extensive range of components, we can offer a large selection of both standard Pull Out Faucet and custom  Basin Tap  units as well as flexible combination. Stainless steel is 100% recyclable and is comprised of over 60% recycled material,  Bestware faucets are the perfect solution in the commercial and industry for better water quality and the circumvention of the development of deleterious substances and bacteria. No plating, no oxidizing, no rust, lead free.

Pre Rinse Faucet,Pre Rinse Kitchen Faucet,Pre Rinse Sprayer,Pre Rinse Spray Tap

Bestware Hardware Production Co., Ltd. , https://www.bestwaremfg.com

Different age, different body shape, different physiological stages of women, have their own different states of mind, this time you need different underwear products to create the perfect waist and curves, hidden humble insignificant, with comfortable and beautiful underwear to combat the years Factors left traces of the female body to maintain a young and elegant body.

This year's hot structuralism not only appeared in the coat, underwear is also a large number of the use of this design approach, bright nude color fabric and black lines hit the color stitching, while maintaining the basic functions of underwear to highlight distinctive visual impact.

All women will attach great importance to the shape of the chest curve, because you can see in front, but often overlook the beauty behind the lines, life work and do not pay attention to standing and sitting posture, resulting in bad habits with chest hump, this bra straps Style design techniques, body shape correction, to create a real perfect curve. (Source: Building Beauty 立美 力 内衣)

Fancy Woven Fabric

Shaoxing City Shenglin Import And Export Co.,Ltd , https://www.shineogroup.com

Pull or Knob by Type

Cabinet Knobs and Pulls

Cabinet Knobs and Pulls, cabinet knobs, knobs and pulls, drawer pulls and knobs, kitchen knobs and pulls

Shenzhen Hongjingyuan Metal&Plastic Products Co., Ltd. , https://www.hjypull.com

After the Spring Festival this year, the sales price of glyphosate in the East China market reached 90,000 yuan (t price, the same below). Compared with the long-term price of between 35,000 and 50,000 yuan in 2007, the current market has no doubt Manufacturers and sellers are excited. This means that after the consolidation of China's glyphosate market in 2007, the price stalemate has been broken, and the beautiful “money” scene of the glyphosate industry is becoming a reality.
Demand to stimulate the expansion of glyphosate Nowadays, glyphosate, a broad-spectrum herbicide, is the largest pesticide in the world, accounting for 30% to 35% of the total herbicide market. A good market situation will promote the further expansion of China's glyphosate industry in 2008. Market experts predict that this year's production capacity will double over the previous year to nearly 800,000 tons. The largest glyphosate manufacturer in China is Zhejiang Xin'an Chemical Co., Ltd. The company expanded 30,000 to 50,000 tons of glyphosate units in 2007. Its driving force is the demand of international and domestic markets.
A senior market person from Anhui Huaxing Company believes that global glyphosate will maintain its best-selling position in the next three years. There are three main reasons: First, in 2008, the recovery and development of agriculture in many countries in South America and Asia, the demand for glyphosate increased rapidly; Second, the United States Monsanto Company with the largest production of glyphosate in the world under the pressure of environmental protection, At the beginning of this year, it gave up its investment in further expansion of glyphosate, and its supply will not continue to grow this year. Third, China's strong demand for agricultural products and the rapid expansion of the planting area of ​​genetically modified crops have become an important factor in the rapid growth of demand for glyphosate.
The relevant personages of several agrochemical enterprises in Hefei said that in addition to the factors of insufficiency in supply, the increase in the price of raw materials is also an important factor in promoting the price increase of glyphosate. Compared with the same period of 2007, the prices of many major raw materials of glyphosate rose by an average of over 40%. In particular, diethanolamine, a major raw material for the production of glyphosate by the diethanolamine method, is not only priced at around 20,000 yuan per ton, but also very high. A tight chemical product, some domestic glyphosate manufacturers have to purchase diethanolamine from the international market.
In addition, the increase in transportation غير مجاز مي باشدts and environmental protection investment has also contributed to the increase in the price of glyphosate. The rise in oil prices directly contributed to the increase in shipping غير مجاز مي باشدts. In 2007, after the occurrence of the “Taipei Cyanobacterial Incident” in Wuxi, Jiangsu Province, the state increased the supervision of the environmental protection of pesticide companies. The domestic pesticide production enterprises had to increase their investment in environmental protection facilities, thereby increasing the production غير مجاز مي باشدts of pesticide products such as glyphosate. , Which in turn pushed the price of glyphosate to rise.
Middlemen push prices to rise Faced with the high returns of the glyphosate market both at home and abroad, China's middlemen have discovered their business opportunities with a keen sense of smell. According to industry insiders, glyphosate has significantly increased prices in recent times, which has stimulated the enthusiasm of domestic pesticide distributors. The active involvement of middlemen not only stimulated the enthusiasm of domestic glyphosate manufacturers, but also directly stimulated the market price of glyphosate to the high-end sprint of 100,000 yuan. A glyphosate primary dealer in Anhui said that their glyphosate is currently shipping at a price of 92,000 yuan and has not been obstructed by users. From this they estimated that glyphosate will soon be expected to rush to the 0,000 mark.
It is understood that China's glyphosate manufacturing enterprises basically have no right to speak, the dominant position of market sales in the hands of pesticide dealers around. Glyphosate powder is added to facilitate storage and transportation, and high profits have attracted pesticide dealers to increase their reserves of glyphosate. An industry insider in Zhejiang believes that in early March of this year, the sales price of glyphosate foreign trade reached 96,000 yuan, which was largely due to the boost of dealers. It is understood that Anhui Huaxing Chemical Company recently formed its own pesticide sales team to distribute a high-profit cup of glyphosate in the sales process.
The government will increase supervision. In 2008, the state will pay more attention to energy conservation and emission reduction. The policy will regulate the environmental assessment and safety assessment of pesticides such as glyphosate, as well as the registration, licensing and fixed-point production qualification of pesticide production. It will become more and more strict. The time required for policy approval procedures is generally longer, and it takes about 1 to 2 years. For the domestic new generation of glyphosate manufacturers, not only face capital and administrative barriers, environmental protection requirements and access to raw material exports will also be a major obstacle.
At present, the domestic industry is currently drafting an upsurge in the expansion of the production of Ganlin, the industry outlook is widely optimistic about the market, the future growth of the industry also needs to be further excavated. The responsibility of the government is to regulate the production and sales channels of pesticide products such as glyphosate and conduct strict inspections on environmental protection, safety, and other aspects to make it healthy. In this context, the long-term development of the glyphosate industry will be strongly supported.

HVAC Filter

Exhaust System Co., Ltd. , http://www.emotorcycleparts.com

General Introduction

High Quality Automatic PVC Mixer Machine Color Mixer

This machine is vacuum emulsifying mixer.It is a processing equipment with mixing, homogenizing, emulsifying,heating fuction, etc.The machine is widely used to produce غير مجاز مي باشدmetic cream,lotion,as well as food cream,paste ,etc.It is the first choice of غير مجاز مي باشدmetic factory which manufacture high quality products. The machine adopts the component of international famous brands, which ensure durable quality and operational stability of the machine. According to the feedback from our customers, this design style provides great satisfaction performance to them.This device is mainly composed of Water phase pot, Oil phase pot, Emulsifying pot, Vacuum system, Lifting system(optional), Electric control system, Operation platform etc.

Vacuum Emulsifying Mixer Features

• SIEMENS frequency converter for speed adjustment, which can meet production of different technology requirement.
• The vacuum defoaming can make the materials meet the requirement of being aseptic.The vacuum material sucking adopted can avoid dust,especially for the powder products.
• Burgmann mechanical sealing, good sealing effect and long working life.

• The tank body and the pipes adopt mirror polishing, which fully conforms to GMP standards.

• Material contact parts all use SUS316L stainless steel.

• The heating method mainly include electric or steam heating for customer's choice.

• Advanced PLC touch screen control is optional.

• The emulsifying pot lid can adopt hydraulic lifting system, easy to clean and the cleaning effect is more obvious, the emulsifying pot can adopt tilt discharge.

Advantage

• It's used for produce the cream, lotion, paste, ointment, paste, conditioner, etc. Complex scraping board blending oar is suitable to every kind of complicated recipe and achieve optimizing effect;
  
• Polytetrafluroethylene scraping board cater to body of blending groove and scrape out visغير مجاز مي باشدity material on boiler wall;
  
• Homogenizer is installed on boiler bottom to increase motor power more thoroughly and strongly. During few production, it can exert homogenizing effect fully;
  
• Mightiness balance isotactic curve rotor is matched with stator with corresponding structure to realize liquid high-capability cut,rubbing,centrifugal to make sure exquisite and slick cream; boiler body and pipe surface mirror polishing 300EMSH (sanitation grade) accords with Daily Chemical and GMP regulation.
  
• Customer can choose frequency conversion timing homogenizer and highest rotate speed is 4500 r/min.

Founded in 2000, with 5 production lines and covering an area of 12,000 square meters, our factory has developed into a professional manufacturer of غير مجاز مي باشدmetics machinery and equipment, by integrating R&D, manafacturing, sales and service. Advanced production equipments are the guarantee for high quality products.


Our product catagories mainly include: Vacuum emulsifying mixer, Liquid washing mixer, Water treatment equipment, Perfume machine, Filling machine, Packing machine, Labeling machine etc. We are able to supply a wide range of high quality products for your One-stop sourcing in our exhibition center.

We attend exhibitions all around the word every year.You are welcomed to see our product and new designed item there .We hope a face to face communicate and service could helpful to our cooperation.

When we make delivery ,the products will be packed in wooden case to avoid of destroy.


A quality department has been set up to control the product quality during every process of production. For years, we are strictly implementing International Quality Management System ISO 9001.

Customized Mini CNC Router

ELE Cnc Router,ELE ATC Cnc Router Co., Ltd.  , http://www.nbcncrouter.com