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Security risk evaluation is a multi-objective decision-making problem, which refers to lots of factors, and the indices system of evaluation play a very important role. Based on the former experience of indices system's design, this paper emphasizes on the filtration of indices, the validity and reliability of indices system. In addition, the paper establishes design idea and principle of indices system, and also establishes an indices system of security risk evaluation for electric power optical-fiber communications network. The indices system is optimized, and attribute weights of indices are ensured by Analytical Hierarchy Process. Through using some theory of statistics and mathematical statistics, the validity and reliability of the indices system are validated.

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about the risk evaluation of network security, a new assessment method based on Nonlinear Principal Component Analysis (NLPCA) is given. The principle and process of NLPCA-RBF is introduced in detail. At last, its superiority is indicated by example. It not only can reduce the dimension of input vector, but also can reserve the nonlinear characteristic of the network by nonlinearity. It is a new evaluation method of more quickly, more effective, more exact.

Abstract. In view of the problem of CO frequency interference in the heterogeneous networks of cognitive radio, this paper presents a method of CO processing by macro cellular and micro cellular cells. A beam forming algorithm for maximizing the network of the user is presented, which is based on the orthogonality of multiple antennas and different geographical locations.The simulation results show that the proposed algorithm can effectively improve the transmission speed between the sub users, so as to improve the utilization of frequency.