The author reviews the profile of CBT and the application of virtual reality in the development of CBT, analyzing the application of virtual reality technology to the development of CBT from three aspects: the development of CBT, comparisons among different development tools of CBT and the comparison of application among different apartment of aviation industry, laying the foundation of developing CBT of aircraft type of our own theoretically.

During the process of the Smart Grid systems construction, the Safe Access Platform has an increasing important role. Not only could it meet the demand that people of power system can telecommute, but also provides different level of security mechanisms for various smart devices, such as Hand-hold Terminal System PDA, Ultra Mobile Personal Computer (UMPC) and Wireless Data Acquisition Terminal. Determining how to guarantee the internal security and meet the security requirements of access control based on roles is an important subject. The paper presents a new network access control system (NAC system) based on roles. According to the security metrics of the network access equipment (NAE), the NAC system has been designed and implemented to provide different safety strategies for different application scenarios. Besides, 802.1x and L2-IP are discussed specially as the most important key techniques of the implementation of the system.