针对无线局域网中传输控制协议(TCP)闭环拥塞控制的贪婪性、媒体接入控制(MAC)协议节点接入的公平性和无线信道的异构性导致TCP出现的上下行不公平和时间不公平问题,提出了一种在接入点上实现上下行时间公平的UDTFLAS(Up/Down Time Fair...针对无线局域网中传输控制协议(TCP)闭环拥塞控制的贪婪性、媒体接入控制(MAC)协议节点接入的公平性和无线信道的异构性导致TCP出现的上下行不公平和时间不公平问题,提出了一种在接入点上实现上下行时间公平的UDTFLAS(Up/Down Time FairLAS)调度算法。UDTFLAS算法依据信道数据发送速率,给无线信道速率较高的TCP流提供更大的发送概率,以保证上下行各TCP流占用相等的无线信道时间。实验结果表明,UDTFLAS算法可以保护单流的吞吐率,实现上下行流的时间公平,能有效提高网络总吞吐量。展开更多
Electrode down-time is an important factor affecting the efficiency and stability of electrical discharge machining(EDM) process. In the research, a way of simulating the regulation of the electrode down-time in an ED...Electrode down-time is an important factor affecting the efficiency and stability of electrical discharge machining(EDM) process. In the research, a way of simulating the regulation of the electrode down-time in an EDM adaptive control system has been studied. All the simulations are performed on Matlab. The simulation results demonstrate that this adaptive controller by regulating electrode down-time can direct the gap state to follow the specified reference gap state with or without disturbances. Finally, the adaptive control scheme is also validated by experiments. The significance of the simulation of an EDM adaptive control system lies on the fact that it provides a convenient way to guide the actual production and provides a new study method for the research of EDM control strategy with no regard of experimental conditions.展开更多
在低负载时断开网络拓扑部分链路是IP over WDM光网络中一种有效的节能方法,但链路断开时段的选择对IP over WDM光网络的阻塞率和节能效果有较大的影响,对此,根据网络中IP流量一天中的周期性变化规律,设计了一种链路能效分时控制策略调...在低负载时断开网络拓扑部分链路是IP over WDM光网络中一种有效的节能方法,但链路断开时段的选择对IP over WDM光网络的阻塞率和节能效果有较大的影响,对此,根据网络中IP流量一天中的周期性变化规律,设计了一种链路能效分时控制策略调整非峰值时间段网络拓扑连接关系,并建立整数线性规划能耗模型,设计了便于求解模型的启发式算法.仿真结果表明,与无链路断开的原始策略相比,所提策略能有效降低网络能耗;与现有的链路断开策略相比,新策略能获得更低的网络请求阻塞率.展开更多
文摘针对无线局域网中传输控制协议(TCP)闭环拥塞控制的贪婪性、媒体接入控制(MAC)协议节点接入的公平性和无线信道的异构性导致TCP出现的上下行不公平和时间不公平问题,提出了一种在接入点上实现上下行时间公平的UDTFLAS(Up/Down Time FairLAS)调度算法。UDTFLAS算法依据信道数据发送速率,给无线信道速率较高的TCP流提供更大的发送概率,以保证上下行各TCP流占用相等的无线信道时间。实验结果表明,UDTFLAS算法可以保护单流的吞吐率,实现上下行流的时间公平,能有效提高网络总吞吐量。
文摘Electrode down-time is an important factor affecting the efficiency and stability of electrical discharge machining(EDM) process. In the research, a way of simulating the regulation of the electrode down-time in an EDM adaptive control system has been studied. All the simulations are performed on Matlab. The simulation results demonstrate that this adaptive controller by regulating electrode down-time can direct the gap state to follow the specified reference gap state with or without disturbances. Finally, the adaptive control scheme is also validated by experiments. The significance of the simulation of an EDM adaptive control system lies on the fact that it provides a convenient way to guide the actual production and provides a new study method for the research of EDM control strategy with no regard of experimental conditions.
文摘在低负载时断开网络拓扑部分链路是IP over WDM光网络中一种有效的节能方法,但链路断开时段的选择对IP over WDM光网络的阻塞率和节能效果有较大的影响,对此,根据网络中IP流量一天中的周期性变化规律,设计了一种链路能效分时控制策略调整非峰值时间段网络拓扑连接关系,并建立整数线性规划能耗模型,设计了便于求解模型的启发式算法.仿真结果表明,与无链路断开的原始策略相比,所提策略能有效降低网络能耗;与现有的链路断开策略相比,新策略能获得更低的网络请求阻塞率.
