With the widespread use of communication and information technology,power system has been evolving into cyber-physical power system(CPPS)and becoming more vulnerable to cyber-attacks.Therefore,it is necessary to enhan...With the widespread use of communication and information technology,power system has been evolving into cyber-physical power system(CPPS)and becoming more vulnerable to cyber-attacks.Therefore,it is necessary to enhance the ability of the communication and information system in CPPS to defend against cyber-attacks.This paper proposes a method to enhance the survivability of the communication and information system in CPPS.Firstly,the communication and information system for critical business of power system is decomposed into certain types of atomic services,and then the survivability evaluation indexes and their corresponding calculation method for the communication and information system are proposed.Secondly,considering the efficacy and cost defensive resources,a defensive resource allocation model is proposed to maximize the survivability of communication and information system in CPPS.Then,a modified genetic algorithm is adopted to solve the proposed model.Finally,the simulation results of CPPS for an IEEE 30-node system verify the proposed method.展开更多
For the problem of large network load generated by the Gnutella resource-searching model in Peer to Peer （P2P） network, a improved model to decrease the network expense is proposed, which establishes a duster in P2P...For the problem of large network load generated by the Gnutella resource-searching model in Peer to Peer （P2P） network, a improved model to decrease the network expense is proposed, which establishes a duster in P2P network, auto-organizes logical layers, and applies a hybrid mechanism of directional searching and flooding. The performance analysis and simulation results show that the proposed hierarchical searching model has availably reduced the generated message load and that its searching-response time performance is as fairly good as that of the Gnutella model.展开更多
基金supported by“Research on Operation Situation Awareness and Proactive Defense of Power Cyber-Physical System Against Cyber Attacks”the Fundamental Research Funds for the Central Universities(No.2018B05814)
文摘With the widespread use of communication and information technology,power system has been evolving into cyber-physical power system(CPPS)and becoming more vulnerable to cyber-attacks.Therefore,it is necessary to enhance the ability of the communication and information system in CPPS to defend against cyber-attacks.This paper proposes a method to enhance the survivability of the communication and information system in CPPS.Firstly,the communication and information system for critical business of power system is decomposed into certain types of atomic services,and then the survivability evaluation indexes and their corresponding calculation method for the communication and information system are proposed.Secondly,considering the efficacy and cost defensive resources,a defensive resource allocation model is proposed to maximize the survivability of communication and information system in CPPS.Then,a modified genetic algorithm is adopted to solve the proposed model.Finally,the simulation results of CPPS for an IEEE 30-node system verify the proposed method.
文摘For the problem of large network load generated by the Gnutella resource-searching model in Peer to Peer （P2P） network, a improved model to decrease the network expense is proposed, which establishes a duster in P2P network, auto-organizes logical layers, and applies a hybrid mechanism of directional searching and flooding. The performance analysis and simulation results show that the proposed hierarchical searching model has availably reduced the generated message load and that its searching-response time performance is as fairly good as that of the Gnutella model.
