This paper deals with the problem of non-fragile linear parameter-varying（LPV） H_∞ control for morphing aircraft with asynchronous switching.The switched LPV model of morphing aircraft is established by Jacobian li...This paper deals with the problem of non-fragile linear parameter-varying（LPV） H_∞ control for morphing aircraft with asynchronous switching.The switched LPV model of morphing aircraft is established by Jacobian linearization approach according to the nonlinear model.The data missing is taken into account in the link from sensors to controllers and the link from controllers to actuators,which satisfies Bernoulli distribution.The non-fragile switched LPV controllers are constructed with consideration of the uncertainties of controllers and asynchronous switching phenomenon.The parameter-dependent Lyapunov functional method and mode-dependent average dwell time（MDADT） method are combined to guarantee the stability and prescribed performance of the system.The sufficient conditions on the solvability of the problem are derived in the form of linear matrix inequalities（LMI）.In order to achieve higher efficiency of the designing process,an algorithm is applied to divide the whole set into subsets automatically.Simulation results are provided to verify the effectiveness and superiority of the method in the paper.展开更多
Today’s network industry needs highly qualified engineers to understand, configure, develop and upgrade switches that can build scalable high performance and ultra-low latency networks. This paper describes a new net...Today’s network industry needs highly qualified engineers to understand, configure, develop and upgrade switches that can build scalable high performance and ultra-low latency networks. This paper describes a new networking laboratory that has been set up to provide hands-on experience on datacenter network switches, such as ARISTA, programming and monitoring the traffic. This paper explains the networking laboratory coursework that students carry out during the course of a semester. The laboratory consists of six hands on experiments on the latest datacenter switches from Arista Networks, two programming assignments that teaches some of the protocols used at data link layer and routing protocols used at the network layer of OSI reference model. The final two laboratory experiments use the Wireshark software tool for traffic monitoring and peeking into details of some of the protocols in TCP/IP such as ARP protocol, Ethernet and so forth. The coursework details include the switch basics, switch hardware, Extensible Operating System (EOS), configuration of Link Aggregation Control Protocol, Multi-chassis Link Aggregation Protocol, Access Control Lists, and Open Short Path First version 2 on Arista switches 7050T-64 and 7048T-4S. The programming tasks cover High-level Data Link Control (HDLC) and Routing Algorithms.展开更多
依托软件定义网络(software defined networking,SDN)管控解耦的优势为数据中心网络(data center network,DCN)设计载荷调度算法,以降低随机突发数据流引发全网链路拥塞的风险。算法首先基于软件定义数据中心网络(software defined data...依托软件定义网络(software defined networking,SDN)管控解耦的优势为数据中心网络(data center network,DCN)设计载荷调度算法,以降低随机突发数据流引发全网链路拥塞的风险。算法首先基于软件定义数据中心网络(software defined data center network,SD-DCN)拓扑结构开展逻辑功能结构化设计,然后构建基于流属性的识别机制和载荷度门限机制以确定基于差异化的流调度时机。同时引入方案评估机制和对比机制并遍历全网可用资源,最终为数据流提供个性化的流量调度方案。测试结果表明,载荷调度算法在各项服务质量(quality of service,QoS)指标考察中均表现出相对优势,验证了该算法在应对不同属性数据流调度方面能够发挥出自适应优化成效。展开更多
研究在多策略网络攻击下切换系统的滑模控制问题.在传感器向控制器传输信息的通道中,系统遭受到多策略的虚假数据注入(false data injection, FDI)攻击.与传统的FDI攻击不同,多策略FDI攻击会根据攻击时刻选择不同攻击策略.多策略FDI攻...研究在多策略网络攻击下切换系统的滑模控制问题.在传感器向控制器传输信息的通道中,系统遭受到多策略的虚假数据注入(false data injection, FDI)攻击.与传统的FDI攻击不同,多策略FDI攻击会根据攻击时刻选择不同攻击策略.多策略FDI攻击造成系统传输信息的损坏,进而导致切换系统状态不稳定甚至发散.为解决这一问题,应用滑模控制方法保证切换系统的依概率输入-状态稳定性能.应用Lyapunov函数方法得到了闭环切换系统稳定性的充分条件.另外,建立了系统状态与受损状态信息之间的数学模型,基于可用的受损状态,设计滑模控制律,所设计的滑模控制律保证了系统状态的可达性,系统状态轨迹在有限时间内被驱动到指定滑模面内.最后,通过数值仿真验证了所提方法的有效性.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61374012,61273083 and 61403028)
文摘This paper deals with the problem of non-fragile linear parameter-varying（LPV） H_∞ control for morphing aircraft with asynchronous switching.The switched LPV model of morphing aircraft is established by Jacobian linearization approach according to the nonlinear model.The data missing is taken into account in the link from sensors to controllers and the link from controllers to actuators,which satisfies Bernoulli distribution.The non-fragile switched LPV controllers are constructed with consideration of the uncertainties of controllers and asynchronous switching phenomenon.The parameter-dependent Lyapunov functional method and mode-dependent average dwell time（MDADT） method are combined to guarantee the stability and prescribed performance of the system.The sufficient conditions on the solvability of the problem are derived in the form of linear matrix inequalities（LMI）.In order to achieve higher efficiency of the designing process,an algorithm is applied to divide the whole set into subsets automatically.Simulation results are provided to verify the effectiveness and superiority of the method in the paper.
文摘Today’s network industry needs highly qualified engineers to understand, configure, develop and upgrade switches that can build scalable high performance and ultra-low latency networks. This paper describes a new networking laboratory that has been set up to provide hands-on experience on datacenter network switches, such as ARISTA, programming and monitoring the traffic. This paper explains the networking laboratory coursework that students carry out during the course of a semester. The laboratory consists of six hands on experiments on the latest datacenter switches from Arista Networks, two programming assignments that teaches some of the protocols used at data link layer and routing protocols used at the network layer of OSI reference model. The final two laboratory experiments use the Wireshark software tool for traffic monitoring and peeking into details of some of the protocols in TCP/IP such as ARP protocol, Ethernet and so forth. The coursework details include the switch basics, switch hardware, Extensible Operating System (EOS), configuration of Link Aggregation Control Protocol, Multi-chassis Link Aggregation Protocol, Access Control Lists, and Open Short Path First version 2 on Arista switches 7050T-64 and 7048T-4S. The programming tasks cover High-level Data Link Control (HDLC) and Routing Algorithms.
文摘5G超密集网络(ultra-dense network,UDN)的引入是为了提升吞吐量,特别是针对静态和低速场景,因此,无法同时满足高吞吐量和高移动速度的需求。对于未来需要同时支持高容量和高速移动的6G新场景,提出一种同心圆模型(homocentric sphere model,HSM)的网络架构,采用控制面/用户面数据分离、多发送接收节点(transmission and reception point, TRP)协同传输的方法来处理密集部署网络中多普勒效应影响大和TRP频繁切换的问题,使得该模型成为密集部署网络下提升网络容量、应对高速移动的有效方法。数据结果证明,所提的HSM有效减小了密集组网高速移动场景下多普勒频移效应,同时能够提供更高的网络遍历频谱效率。
文摘依托软件定义网络(software defined networking,SDN)管控解耦的优势为数据中心网络(data center network,DCN)设计载荷调度算法,以降低随机突发数据流引发全网链路拥塞的风险。算法首先基于软件定义数据中心网络(software defined data center network,SD-DCN)拓扑结构开展逻辑功能结构化设计,然后构建基于流属性的识别机制和载荷度门限机制以确定基于差异化的流调度时机。同时引入方案评估机制和对比机制并遍历全网可用资源,最终为数据流提供个性化的流量调度方案。测试结果表明,载荷调度算法在各项服务质量(quality of service,QoS)指标考察中均表现出相对优势,验证了该算法在应对不同属性数据流调度方面能够发挥出自适应优化成效。
文摘研究在多策略网络攻击下切换系统的滑模控制问题.在传感器向控制器传输信息的通道中,系统遭受到多策略的虚假数据注入(false data injection, FDI)攻击.与传统的FDI攻击不同,多策略FDI攻击会根据攻击时刻选择不同攻击策略.多策略FDI攻击造成系统传输信息的损坏,进而导致切换系统状态不稳定甚至发散.为解决这一问题,应用滑模控制方法保证切换系统的依概率输入-状态稳定性能.应用Lyapunov函数方法得到了闭环切换系统稳定性的充分条件.另外,建立了系统状态与受损状态信息之间的数学模型,基于可用的受损状态,设计滑模控制律,所设计的滑模控制律保证了系统状态的可达性,系统状态轨迹在有限时间内被驱动到指定滑模面内.最后,通过数值仿真验证了所提方法的有效性.
