Investigation Of Distributed Parallel Experiment System And The Key Technique

The research of Network Experiment System is a hot topic in Experiment teaching and network teaching. Various modules and instances had been taken out, and many new technologies had been applied in these systems, which makes great contribution to the development of Network Experiment System. Construction standardization and high efficient parallelism are still the key points of the research, which attracts scholars'great attentions and they do lots of research works on it. In this paper, construction standardization and high efficient parallelism have been discussed deeply from the theoretical and experiment aspects. The main innovation and conclusion could be summarized as followed.Based on the current situation and significance of Network Experiment System research, the researching orientation and technical realization have been classified. The topological structure has been analyzed. As a result, the distributed network parallel experiment system architecture and the hierarchy module based on OSI principle are presented. From the bottom to the top, there are Physical Driver Layer, Experiment Operation Layer, Experiment Network Layer, Experiment Data transport Layer, Experiment Control Layer, Decision Maker Layer and Experiment Application Layer. The hierarchy architecture is the foundation of Network Experiment System research, and plays a guiding role in its standardization.The representative Bus of Physical Layer and four realizations of Driver Layer have been discussed, which defined the basic physical interfaces of Network Experiment System. The character of the experiment has been researched. The experiment system and its classified character have been discussed in a systematic perspective. The three basic functions of Experiment operation Layer have been analyzed. The standard of Experiment Control Layer, the experiment control module and general service module have been discussed in detail. The division principle, the boundary conditions and the optimal formula for Experiment Operation Layer and Experiment Control Layer have been worked out. So the method of improving the parallel execution efficiency of the experiment is provided. Based on the current standard network module, the data transfer in Experiment Network Layer has been analyzed. The standard data transferring mode has been researched and the parallel service module for three nodes has also been concluded. The data standardization theory and the method of Experiment Data Transport Layer have been presented by a real experiment. The encryption algorithm for data transfer security has also been analyzed. General compression algorithms such as RLE, Huffman and LZW have been compared from the perspective of network Experiment data compression, and the choosing method of algorithms corresponding with different modes has been found out.Based on the decision-making theory, the theory calculation has been taken with analytic hierarchy process method, combined with the application background of Network Experiment System. The main theory calculation is implementad from the two aspects of network Experiment routing protocol and Experiment relativity. As a result, the decision theory formula has been worked out for high efficient parallelism. A dynamic decision module for actual application has been researched. The basic function of Experiment Application Layer has been discussed from three aspects of the service security, system usability and system stability. The applied method of the online-embedded voice, video and dynamic thermal region image compression which afford narrow bandwidth area in Network Experiment System have also been researched.The queue theory has been employed for evaluating the performance of various service modes of the Network Experiment System. The distributed parallel Network Experiment System instance based on the supermarket mode has been analyzed. The research adopts Poisson Flow simulation algorithm to evaluate the system performance, and achieve optimization strategy for the system configuration through calculating the service cost and waiting cost. The research result shows that, the Network Experiment System based on hierarchical architecture has flexible distributed property and the system get higher efficient parallelism by adopting the layer division method and decision maker theory.