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Multimedia network classrooms, with their convenient, fast, practical and easy-to-use features, have become the teaching solution given priority by teachers and students in the construction of campus informatization. Especially now, the information technology curriculum has become a compulsory course for elementary and middle schools across the country. Mastering information technology and using information technology for learning have become the most basic requirements for elementary and middle school students. For multimedia teaching, schools need to have tailor-made multimedia teaching software, which can provide teachers with better teaching materials and teaching methods, expand teachers' ability space, and provide students with more vivid and colorful image teaching; at the same time A complete system platform is also needed, which can improve the overall management level and work efficiency, promote information exchange, and be in line with international teaching standards. However, ordinary primary and secondary schools often lack personnel who are proficient in network system management and maintenance, and most schools are not well funded.
At present, the school's multimedia teaching system generally uses a PC as a student machine, and the student machine is only used as a machine for displaying teaching content and provides students with simple operations without requiring too much configuration. PCs are expensive, with a utilization rate of only 10% to 30%, and are generally eliminated in 3-5 years. The cost of upgrading hardware and software is high, resulting in a great waste of resources. And because of funding difficulties in many schools, multimedia teaching has become a piece of chicken ribs. At the same time, the PC is distributed management, the equipment is scattered, the PC is relatively personalized, and the user's arbitrariness is large. These have brought great management difficulties to the system administrator and caused a lot of work to maintain the PC.
Multimedia teaching system is built on the network, they are inseparable. Without the smoothness of the network, there is no normal use of the teaching system. The large amount of data flow between the PC and the server is easy to cause bandwidth pressure. The PC has a large number of storage devices locally, which is easy to be infected with viruses and spread in the network and suffer hacker attacks. These will eventually lead to network paralysis and threaten system security. .
As multimedia teaching is becoming more and more widely used, the software products on the market are also mixed. Many multimedia teaching softwares only add multimedia functions purely, and do not give full play to the function of multimedia in teaching, which provides students with a perceptual learning environment. At the same time, due to the complex operation of the multimedia teaching system, it sometimes reduces the teaching efficiency.
1. The client adopts Nanhao NC, which reduces the total cost of ownership, including software and hardware purchase, installation and upgrade costs, maintenance costs and user use costs. The price of Nanhao NC is lower than that of PC, the configuration is simple, there is no extra peripherals and local storage, no client software is needed, all the work is done on the server, Nanhao NC is only used as a display desktop and I / O device, and a small The data flow does not put pressure on the network bandwidth, nor will it threaten the security of the system network; and Nanhao NC's software and hardware do not need to be upgraded, and the operation is very convenient. It reduces the workload of the administrator and also facilitates the user's use.
2. The multimedia teaching software adopts the extreme domain multimedia teaching software of Nanjing Youwang Technology Company. Multimedia teaching software not only provides teachers with good teaching content and teaching methods, but also provides students with a better way to communicate with teachers. Moreover, Jiyu multimedia teaching software also has better management and control functions.
3. The overall solution provides a stable hardware platform for the multimedia teaching system. Because of adopting embedded operating system, Nanhao NC has stable performance, simple and easy operation, centralized management and maintenance, and enhanced the stability and manageability of the network system. At the same time, the Multimedia Multimedia Teaching System also provides schools, teachers and students with a good online teaching tool.
Five, system function
1. Teaching broadcast: The teacher transmits the teacher terminal interface to the terminal screen of one or more students. The teacher can perform the operation demonstration for the students on their own screens, and the students' operation of the keyboard and mouse is invalid;
2. Teaching monitoring: the teacher can select the students to be monitored, and can view the operation of one or more students at any time through the screen machine, which does not affect the normal use of the students;
3. Typical demonstration: Teachers can broadcast the interface of a more typical student terminal to other students. During the demonstration process, teachers can insert at any time for comment or guidance;
4. Individual tutoring: Teachers can use this function to provide tutoring to a classmate like hand-to-hand;
5. Group discussion: Teachers can divide students into multiple groups, students in groups can have free discussions, and teachers can participate in the discussions of each group;
6. Raise hands to answer: students can raise their hands electronically, and teachers can communicate with students two-way after answering;
7. Warning: the teacher finds that the activities performed by a student or students are inappropriate, or needs to be reminded to pay attention to the lecture, he or she can be warned, the operation will directly lock the keyboard and mouse of the student computer operating;
8. Remote management: the teacher can send a command to the student computer, such as shutting down the student computer, restarting the student computer, and opening or closing an application.
Ultra long life using 170,000 hours without cause 
Multimedia network classroom solution
I. Overview
Second, the problems faced by users
Third, the solution
For the shortcomings in multimedia teaching, Hebei Nanhao launched, using Nanhao NC as a student-side device, and Nanjing Youwang Technology's extreme domain software as an overall solution for multimedia teaching software. Combining advanced information technology and modern educational ideas to provide an information-based teaching environment. Not only can it solve the problems brought about by the PC, but also can meet the students ’modern informatics courses and other disciplines, teachers’ computer skills training and other requirements, it can also achieve the maximum ease of management of the multimedia teaching system, and can Greatly reduce maintenance costs, the most important thing is to be a competent assistant of the primary and secondary education system.
The software system of the overall solution uses a new three-layer C / S structure based on Nanhao NC and terminal server, which is different from the traditional C / S structure. The system structure of the network adopts the switched 100BASE-T fast Ethernet based on TCP / IP protocol as the backbone network, and sets up a main switch to connect the gateway and the domain server through twisted pair to form the central computer room. The sub-switches installed in each classroom are connected down through the twisted pair. Each classroom is equipped with a terminal server, an application server for teachers, and several student computers. The South NC of each student is connected through a switch set. The network topology The structure is star-shaped. The entire network is connected to external networks through dedicated lines. The topology diagram is as follows:
4. Problems solved This solution mainly solves the main problems mentioned above:
The multimedia teaching program is formed by applying computer and network technology to the teaching field. It combines images, sound, text, animation and other media to provide students with rich and vivid teaching materials to achieve a new classroom with entertaining effects. Teachers can teach and answer questions through the LAN / Internet, and can give students visual explanations through the network, and demonstrate the application software systems of various subjects for the students. Students can ask the teacher questions and ask the teacher to answer them. These are achieved through computers and networks, teachers and students do not have to leave their seats. At the same time, teachers can also carry out other classroom-related management through the multimedia classroom. The main functions provided are:
Six, program advantages
1. Advantages compared with using PC:
1) Significantly reduce training costs: home appliance operation, simple and easy;
2) Make full use of the purchased computing functions to greatly improve the cost performance of the entire system;
3) Application deployment is quick and easy: administrators or teachers only need to install or upgrade all applications on the server once, and publish the software according to the different needs of student computers;
4) Completely centralized management: greatly reduce the blockage caused by various terminal equipment failures and improper use, effectively improve the use efficiency of terminal equipment, thereby improving the quality of teaching;
5) The management work is concentrated on the server, the workload is less, and the security is more improved;
6) The system is simple, durable, no noise, low power consumption;
7) Easier to manage all functions, computing, storage and anti-virus management of network computers are completed on the server. Authorization and application management of different network computers through the server reduce management costs and improve management efficiency and use efficiency.
8) Good security, which can not only prevent user accounts from being illegally embezzled, but also effectively supervise user operations. The display, mouse and keyboard information are encrypted to ensure the security of network data and unit secrets; the modular design eliminates network computers Possibility of infection and spread of viruses; local power failure will not cause loss of information.
9) Higher-efficiency Lingsi network computer transmits only the commands and display information of the mouse and keyboard on the network, which greatly reduces the network load and improves the efficiency and speed of the network.