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In this paper, to meet the security need of electronic records under the digital office environment, technological requirement of the security of electronic records is analyzed, and the security model of electronic records based on IPSec protocol is designed and tested under Windows 2000 Server system. As is showed in the test result, this model can secure the electronic records based on digital office environment.

Retracted paper: In order to realize the fast and accurate communication between AB SLC500 PLC and Profibus network, this thesis studies the Profibus protocol and develops the Profibus application program in the Flex I/O module. Thus the communication between SLC500 PLC and Profibus network is realized. Compared with the applying of SLC500 to control the other equipments and network, the applying of the Flex I/O module promotes the controlling efficiency and responding rate and realizes the complete control of the controlling system. The result of this research shows that this plan can ensure the accuracy, reliability and efficiency of the data transported.

Retracted paper: Since AB SLC500 PLC does not support the Profibus protocol, it can not communicate with Profibus network. In order to realize the fast and accurate communication between these two, this thesis studies the Profibus protocol and develops the Profibus application program in the Flex I/O module. Thus the communication between SLC500 PLC and Profibus network is realized. Compared with the applying of SLC500 to control the other equipments and network, the applying of the Flex I/O module promotes the controlling efficiency and responding rate and realizes the complete control of the controlling system. The result of this research shows that this plan can ensure the accuracy, reliability and efficiency of the data transported.

With people pay more and more attention to component software testing, the generation of test case is as one of the important works of software testing, it becomes a hotspot inevitably. For component software testing, making combination of the testing method based on model and testing method based on Genetic Algorithm, this paper proposes a generating method of test case which based on UML (Unified Modeling Language) activity diagram and Genetic Algorithm, and gives the overall design and implementation steps of the method. Then this paper applies the proposed method to model the adding table business in catering management system, and design test case. The example verifies the feasibility and validity of the method.