Study On Diffraction Radiation Of Nano-scale Structure Excited By Free Electron And Its Application In THZ

The extensive application of information technology, especially the use of office automation system, a substantial increase in the efficiency of information sharing, but also improves the overall office efficiency.Now, the information transmission and sharing,is change from a single text to graphics, image, audio and video, situation and many kinds of product. Audio and video with its vivid, lively, intuitive features the popular,has become the government, enterprises and institutions and other departments is one of the necessary ways to grasp information.The role of the audio-visual data sharing security has been gradually.In this paper, according to the requirements of a government department,to carry out research needs,research, design and construction the system of the government departments share audio and video materials. The paper expounds the background,purpose and significance of the research,explain the stream media, video on demand,database management and integration of three networks and related technology and Application,analysis of these technologies in the application of the government,find out the existing problems,proposed the research content, objectives and achievements. Then introduced the basic concept, the technology principle and the transmission process of the streaming media,the basic concept,the basic concept,the system composition and the process of the video on demand,the database tuning, restructuring and reconstruction of data management technology,the basic concept, the technology base and development trend of the three nets fusion. Summarize the overall demand of users.Such as connect the office network and the video nonlinear editing network.connect the audio and video data sharing system,the audio nonlinear editing system,and the satellite TV receiving system.Watch the multi satellite TV programs in the internal organs of cable television network and the office network.Through the database,hierarchical management audio-visual programs,and provide audio and video programs upload, download and video on demand. And sort out the system of business process and data flow.Analysis the feasibility of system design and construction. And made the overall design and the design of database system.Discusses the system design principles, the architecture and the system module partition, relationship, the detailed design of the database table structure and data storage.Integrated construction of each subsystem.With theimplementation of interface, design process and sequence of each software module.Then according to the requirement of the system function design and user performance,and show the result of the system test, verification the real time and efficacious system. The system test and the practical application indicates that,the Design scheme is Feasible,the system according to the scheme is easy to use and efficient completion,it can improve the efficiency of data sharing,it has a higher application value.