A kind of new type three-phase magnetism valve type controllable reactor is proposed in this article, its structure and the principle are introduced. The article carried the electromagnetism analysis on the new type magnetism valve type controllable reactor, and established the three-phase magnetism valve type controllable reactor two-dimensional simulation model with Ansoft electric-magnetic field analysis software. Simulation results verified the feasibility of adjusting the reactor reactance smoothly by adjusting the thyristor's triggering angle. Lastly, it made an analysis about three-phase magnetism valve type controllable reactor's electromagnetism field distribution.

A method of four-level emergency rejuvenation for survivable system was proposed. Firstly, failure models of survivable system were formally described based on stochastic Petri nets, in which a number of measurable index parameters for rejuvenation were also given out. And then a four-level recursive emergency rejuvenation strategy was presented based on system-level, service-level, process-level and thread-level, the computing process of rejuvenation priority is also defined and the chain of rejuvenation is obtained. Eventually, the implementation process of four-level autonomous emergency rejuvenation strategy was described using stochastic Petri nets. Compared with the traditional cyclical recovery strategy, the proposed method reduced the time and costs of emergency recovery, and enhanced the recoverable elasticity of survivable system.

A structure of cognitive unit for survivable system was proposed. Firstly, a hierarchical cognitive structure of survivable system with multilayer cognition function was established, the hierarchical cognitive structure was divided into three planes. Secondly, a cognitive unit structure based on monitor-decide-execute was put forward which has a certain degree of self-management ability, on the basis, introduced the extended cognitive unit structure. Then, a performance analyzing framework of cognitive structure was built to describe the structure and behavior of cognitive process.

It is becoming more and more difficult to manage, maintain and keep the key services of mission-critical systems by manual because of hardware problems, software bug, misoperation and malicious attacks. In order to solve the above problems, a self-configuration model was proposed, and awareness algorithm was discussed. The heartbeat mechanism was utilized to realize internal environment awareness, and then the context-modeling technology was introduced to describe user activities and system resources formally, which can obtain the external environment awareness. The self-configuration model has interactivity among modules during operations, and able to improve the self-management ability of mission-critical systems effectively.

A method of autonomous recoverment for survivable system was proposed. Firstly, failure models of survivable system were formally described based on stochastic Petri nets, in which a number of measurable index parameters for recoverment were also given out. And then a recursive autonomous recoverment strategy was presented,Compared with the traditional cyclical recovery strategy, recoverment strategies reduced the time and costs of emergency recovery.