组播技术从IP组播到应用层组播的发展,解决了IP组播部署困难的问题.应用层组播采用终端主机转发数据的方式,在一对多的媒体内容分发方面具有广阔的应用前景.由于终端主机灵活性高,可随意退出组播树,在传输数据时易中断的特点,因此需要...组播技术从IP组播到应用层组播的发展,解决了IP组播部署困难的问题.应用层组播采用终端主机转发数据的方式,在一对多的媒体内容分发方面具有广阔的应用前景.由于终端主机灵活性高,可随意退出组播树,在传输数据时易中断的特点,因此需要解决应用层组播的稳定性问题.首先分析了影响应用层组播稳定的三个因素:节点的转发能力、稳定状态和节点间通信延时.其次根据这些约束条件抽象出T-DTD(Spanning tree based on degree-constrained,max on-session time and depth bound for ALM)模型,最后给出稳定度因子在T-DTD下的表达形式,并据此提出一种适用T-DTD模型下的DTD-H(DTD-heuristic)算法,模拟实验证明该算法在降低平均时延、最大延时和提高稳定度方面有明显作用.展开更多
Some new results for stability of uncertain time-delay systems are derived and the stability degree is also discussed. Some previous results for stability and robust stability of time-delay systems are improved. Lastl...Some new results for stability of uncertain time-delay systems are derived and the stability degree is also discussed. Some previous results for stability and robust stability of time-delay systems are improved. Lastly, examples are included to illustrate our results.展开更多
The stability degree of periodic solution of nonlinear nonautonomous system was defined by means of the Floquet theory. A method evaluating the stability degree of periodic solution based on transient response was pre...The stability degree of periodic solution of nonlinear nonautonomous system was defined by means of the Floquet theory. A method evaluating the stability degree of periodic solution based on transient response was presented by the aid of the concept of dynamic,systems or flows. The critical value of a system was determined by the condition, i.e., its stability degree equals zero. Stable regions of rotor systems with balanced and unbalanced disk supported on lubricated bearings were calculated. The study shows that stable region decreases with the increase of speed for a balanced rotor system and decreases with the increase of unbalance for an unbalanced rotor system. Stable regions of periodic solutions are less than that of equilibrium points under the same systematic conditions.展开更多
文摘组播技术从IP组播到应用层组播的发展,解决了IP组播部署困难的问题.应用层组播采用终端主机转发数据的方式,在一对多的媒体内容分发方面具有广阔的应用前景.由于终端主机灵活性高,可随意退出组播树,在传输数据时易中断的特点,因此需要解决应用层组播的稳定性问题.首先分析了影响应用层组播稳定的三个因素:节点的转发能力、稳定状态和节点间通信延时.其次根据这些约束条件抽象出T-DTD(Spanning tree based on degree-constrained,max on-session time and depth bound for ALM)模型,最后给出稳定度因子在T-DTD下的表达形式,并据此提出一种适用T-DTD模型下的DTD-H(DTD-heuristic)算法,模拟实验证明该算法在降低平均时延、最大延时和提高稳定度方面有明显作用.
文摘Some new results for stability of uncertain time-delay systems are derived and the stability degree is also discussed. Some previous results for stability and robust stability of time-delay systems are improved. Lastly, examples are included to illustrate our results.
文摘The stability degree of periodic solution of nonlinear nonautonomous system was defined by means of the Floquet theory. A method evaluating the stability degree of periodic solution based on transient response was presented by the aid of the concept of dynamic,systems or flows. The critical value of a system was determined by the condition, i.e., its stability degree equals zero. Stable regions of rotor systems with balanced and unbalanced disk supported on lubricated bearings were calculated. The study shows that stable region decreases with the increase of speed for a balanced rotor system and decreases with the increase of unbalance for an unbalanced rotor system. Stable regions of periodic solutions are less than that of equilibrium points under the same systematic conditions.
