Journal of Computer Hardware Engineering(TRANSFERRED)

Abstract With the rapid development of computer network, the construction of campus network is the inevitable choice of the development of information network. The campus network system is a very large and complicated system. It is not only for modern teaching, integrated information management and office automation series of applications to provide basic operating platform, but also to provide a variety of application services, so that information can be timely and accurate delivery. The campus network construction in the application of network technology is the important branch of LAN technology to build and management. This paper introduces the goal of campus network design and the selection of network technology, network equipment selection and so on, and gives the concrete network topology diagram through the example of the campus network design and construction process. The study also explains how to plan the formation of campus network efficiently and safely.

Abstract This paper introduces the basic concept of network and router, briefly introduces the network layered diagnosis technology, discusses the diagnosis of various interfaces of the router, and summarizes the troubleshooting of Internet connectivity fault.

Abstract With the rapid development of computer technology, microelectronics and related technologies, embedded systems are being applied to more and more fields. In industrial control, especially in motion control, the complex control and processing, in the past more use of industrial computers and PLC as a processor. However, there are many disadvantages to the use of industrial computers and PLCs in smaller applications such as mobile robots. The embedded motion control system based on microprocessors and embedded Linux is small in size, has strong processing power and flexibility. More and more applications. In this paper, we study the motion control system based on embedded Linux. The host computer built by Intel Xscale architecture microprocessor PXA255 adopts the embedded Linux operating system. The DC motor digital servo control board constructed by AT89S52 is used as the lower motion control unit, which communicates through the serial interface to form a movement Control System.

Abstract With the development of economy and society, people's living standards are getting higher and higher, and the phenomenon of office at home is becoming more and more common. The network plays a vital role here. Community of network engineering to provide convenience for people at the same time, its security is also extremely important. Technology in the continuous development of the network into every household, the study of such a daily life for the needs of the network engineering integration program is essential. In this subject, according to the characteristics of the district specifically designed a set of network engineering program. This paper mainly introduces the related network technology, the choice of equipment, the network formation of the district, the division of IP address, the integrated wiring, and the network security. According to people's daily life and management of the basic situation, designed a safe and efficient network system to facilitate people's lives, improve people's quality of life.

Abstract Turnout and conversion system is essential for rail transit infrastructure, it is the weak links on the line, the need for specialized technology and facilities to protect the safety of the train. Turnout conversion and locking, is directly related to traffic safety key equipment. Turnout of the manipulation is divided into manual, electric two kinds of ways. Manual is the operator through the turnout grip in the field directly manipulate the turnout of the conversion and locking. This method is low efficiency, labor intensity, cannot meet the requirements of railway modernization. Manual mode is positive with the non-centralized chain was transformed and gradually reduced. Electric way, is converted by various types of switch machines and lock the turnout, easy to focus on the operation, to achieve automation. The switch machine is used to reliably switch the turnout position, change the turnout direction, lock the turnout track, reflecting the turnout position. The switch machine is an important signal basic equipment, it is to ensure traffic safety, improve transport efficiency, improve the driving force of labor degree, and play a very important role. To meet the train speed after the traffic safety and improve transport efficiency of the requirements, turnout conversion device must be high security, high reliability, long life, and less maintenance. ZD6-type electric switch machine cannot meet this requirement, so now widely used S700K-type electric switch and ZYJ7 type electric hydraulic switch machine. Their common features are: the use of external locking, sharp and heart of the dynamic security from the external lock to ensure that the two sharp rails from the linkage to split; sharp track, heart track are more traction, can achieve the whole Close the paste and the whole folder foreign body inspection to ensure the safety of the train; the use of three-phase asynchronous motor failure, and long life.