The recent growth of the World Wide Web has sparked new research into using the Internet for novel types of group communication, like multiparty videoconferencing and real-time streaming. Multicast has the potential t...The recent growth of the World Wide Web has sparked new research into using the Internet for novel types of group communication, like multiparty videoconferencing and real-time streaming. Multicast has the potential to be very useful, but it suffers from many problems like security. To achieve secure multicast communications with the dynamic aspect of group applications due to free membership joins and leaves in addition to member's mobility, key management is one of the most critical problems. So far, a lot of multicast key management schemes have been proposed and most of them are centralized, which have the problem of 'one point failure' and that the group controller is the bottleneck of the group. In order to solve these two problems, we propose a Key Management Scheme, using cluster-based End-System Multicast (ESM). The group management is between both 1) the main controller (MRP, Main Rendezvous Point) and the second controllers (CRP, Cluster RP), and 2) the second controllers (CRPs) and its members. So, ESM simplifies the implementation of group communication and is efficient ways to deliver a secure message to a group of recipients in a network as a practical alternative to overcome the difficulty of large scale deployment of traditional IP multicast. In this paper, we analyze different key management schemes and propose a new scheme, namely Advanced Transition/Cluster Key management Scheme (ATCKS) and find it has appropriate performance in security.展开更多
针对直流受端系统结构复杂、运行方式灵活多变的现状，对直流系统功率稳定进行分析，提出了受端系统电压支撑强度因子（receiving．end．system voltage support strength factor，RVSF），并给出了使用RVSF对受端系统电压支撑强度进行...针对直流受端系统结构复杂、运行方式灵活多变的现状，对直流系统功率稳定进行分析，提出了受端系统电压支撑强度因子（receiving．end．system voltage support strength factor，RVSF），并给出了使用RVSF对受端系统电压支撑强度进行划分的标准。定义临界功率稳定时的RVSF为临界受端电压支撑强度因子，该因子值可以在不同受端系统中保持恒定，能够满足受端系统运行方式多样的现状。分析了RVSF与电压稳定因子的关系，得到了使用RVSF对换流母线静态电压稳定进行判别的方法。最后通过算例对使用RVSF评价受端系统电压支撑强度的有效性进行了验证。展开更多
文摘The recent growth of the World Wide Web has sparked new research into using the Internet for novel types of group communication, like multiparty videoconferencing and real-time streaming. Multicast has the potential to be very useful, but it suffers from many problems like security. To achieve secure multicast communications with the dynamic aspect of group applications due to free membership joins and leaves in addition to member's mobility, key management is one of the most critical problems. So far, a lot of multicast key management schemes have been proposed and most of them are centralized, which have the problem of 'one point failure' and that the group controller is the bottleneck of the group. In order to solve these two problems, we propose a Key Management Scheme, using cluster-based End-System Multicast (ESM). The group management is between both 1) the main controller (MRP, Main Rendezvous Point) and the second controllers (CRP, Cluster RP), and 2) the second controllers (CRPs) and its members. So, ESM simplifies the implementation of group communication and is efficient ways to deliver a secure message to a group of recipients in a network as a practical alternative to overcome the difficulty of large scale deployment of traditional IP multicast. In this paper, we analyze different key management schemes and propose a new scheme, namely Advanced Transition/Cluster Key management Scheme (ATCKS) and find it has appropriate performance in security.
文摘针对直流受端系统结构复杂、运行方式灵活多变的现状，对直流系统功率稳定进行分析，提出了受端系统电压支撑强度因子（receiving．end．system voltage support strength factor，RVSF），并给出了使用RVSF对受端系统电压支撑强度进行划分的标准。定义临界功率稳定时的RVSF为临界受端电压支撑强度因子，该因子值可以在不同受端系统中保持恒定，能够满足受端系统运行方式多样的现状。分析了RVSF与电压稳定因子的关系，得到了使用RVSF对换流母线静态电压稳定进行判别的方法。最后通过算例对使用RVSF评价受端系统电压支撑强度的有效性进行了验证。
