A new method that stabilizes network-based systems with both bounded delay and packet disordering is discussed under the state feedback controller. A novel model, fully describing the dynamic characteristic of network...A new method that stabilizes network-based systems with both bounded delay and packet disordering is discussed under the state feedback controller. A novel model, fully describing the dynamic characteristic of network-based systems with packet disordering, is constructed. Different from the existing models of network-based systems, the number of delay items is time-varying in the model proposed. Further, this model is converted into a parameter-uncertain discrete-time system with time-varying delay item numbers in terms of matrix theory. Moreover, the less conservative stability condition is obtained by avoiding utilisation of Moon et al.’ inequality and bounding inequalities for quadratic functional terms. By solving a minization problem based on linear matrix inequalities, the state feedback controller is presented. A numerical example is given to illustrate the effectiveness of the proposed method.展开更多
AODV协议通过选择跳数最少的路径传输数据,却未考虑路径稳定性,当路径存活时间短时就会引发路径修复或路由重新发起,耗费大量网络资源。为提高网络性能,对该协议进行改进,提出了AODV-S-M(multi-path protocol of AODV based on stabili...AODV协议通过选择跳数最少的路径传输数据,却未考虑路径稳定性,当路径存活时间短时就会引发路径修复或路由重新发起,耗费大量网络资源。为提高网络性能,对该协议进行改进,提出了AODV-S-M(multi-path protocol of AODV based on stability)协议。其采用定位技术预测路径生存期,选择跳数少、稳定性高的路径发送数据;并引入多路由来保证传输可靠性。最后,使用网络模拟器将两个协议进行模拟比较,验证了AODV-S-M协议可有效提高路据包投递率、减少路由开销。展开更多
某些工业环境往往有一个或多个用于监测和/或控制的周期性实时系统,而今,这样的环境也难以抵御Internet的吸引和渗透。如果在单个系统中,既能保证实时数据的正常传递,又能与Internet连通实现尽力服务,应该是一个值得研究的课题。为此提...某些工业环境往往有一个或多个用于监测和/或控制的周期性实时系统,而今,这样的环境也难以抵御Internet的吸引和渗透。如果在单个系统中,既能保证实时数据的正常传递,又能与Internet连通实现尽力服务,应该是一个值得研究的课题。为此提出了IaI(Industry and Internet)交换设备的概念,主要讨论了其中的队列调度一环。以三个实时队列和一个尽力服务队列为前提,分析了四种队列模型,给出了实时数据包最长等待时间的计算公式。展开更多
基金supported by the National Natural Science Foundation of China (60874057 60725312+3 种基金 61074029)the Liaoning Provincal Foundation of Science and Technology (20082023)the Natural Science Foundation of Liaoning Province (20092083)China Postdoctoral Science Foundation Project (20100471488)
文摘A new method that stabilizes network-based systems with both bounded delay and packet disordering is discussed under the state feedback controller. A novel model, fully describing the dynamic characteristic of network-based systems with packet disordering, is constructed. Different from the existing models of network-based systems, the number of delay items is time-varying in the model proposed. Further, this model is converted into a parameter-uncertain discrete-time system with time-varying delay item numbers in terms of matrix theory. Moreover, the less conservative stability condition is obtained by avoiding utilisation of Moon et al.’ inequality and bounding inequalities for quadratic functional terms. By solving a minization problem based on linear matrix inequalities, the state feedback controller is presented. A numerical example is given to illustrate the effectiveness of the proposed method.
文摘AODV协议通过选择跳数最少的路径传输数据,却未考虑路径稳定性,当路径存活时间短时就会引发路径修复或路由重新发起,耗费大量网络资源。为提高网络性能,对该协议进行改进,提出了AODV-S-M(multi-path protocol of AODV based on stability)协议。其采用定位技术预测路径生存期,选择跳数少、稳定性高的路径发送数据;并引入多路由来保证传输可靠性。最后,使用网络模拟器将两个协议进行模拟比较,验证了AODV-S-M协议可有效提高路据包投递率、减少路由开销。
文摘某些工业环境往往有一个或多个用于监测和/或控制的周期性实时系统,而今,这样的环境也难以抵御Internet的吸引和渗透。如果在单个系统中,既能保证实时数据的正常传递,又能与Internet连通实现尽力服务,应该是一个值得研究的课题。为此提出了IaI(Industry and Internet)交换设备的概念,主要讨论了其中的队列调度一环。以三个实时队列和一个尽力服务队列为前提,分析了四种队列模型,给出了实时数据包最长等待时间的计算公式。
