查询词典 switched

Modeling and stability analysis problem of linear switched system are emphasized in this part and main results include:(1) Through investigation in the projection of 〓 on x, where x denotes continuous state vector, a series of sufficient conditions for stability, asymptotic stability and unstability of linear switched system's equilibrium in the sense of Lyapunov are achieved. And also, a sufficient and necessary condition for state bounded stability of linear switched system is received.(2) For a class of periodical linear switched system whose switching sets are a group of ordinal lines starting from the original point, it's proved that state bounded stability can be defined by the running characteristic in a single period (3) Based on linear switched system, the concept of linear switched system network is put forward. Linear switched system network is a complex network interconnected by many linear switched systems.

这部分着重研究线性切换系统的建模与稳定性分析问题，主要成果包括：（1）通过考察〓在x上的投影，得到线性切换系统的平衡点在Lyapunov意义下稳定、渐近稳定及不稳定的一系列充分条件，并得到了线性切换系统状态有界稳定的一个充要条件；（2）证明了对于一类切换集为从原点出发的一组射线的周期线性切换系统，其状态有界稳定可根据一个周期内的系统运行特性来判定；（3）在线性切换系统的基础上提出了线性切换系统网络的概念，线性切换系统网络是由多个线性切换系统交互作用而形成的复杂网络。

Telecommunication systems with packet-switched multimedia terminals (1) and nodes (8,9) for packet-switched multimedia sessions and with servers (2,3) for exchanging multimedia signalling information for said packet-switched multimedia sessions and with terminating units (4) are provided with gateways (7) for in response to transferral messages originating from said packet-switched multimedia terminals (1) and arriving at said servers (2,3) transferring packet-switched multimedia sessions between packet-switched multimedia terminals (1) and nodes (8,9) to circuit-switched calls between gateways (7) and circuit-switched terminals (5) via switches (6), to continue possibly interrupted sessions via replacing calls.

一种电信系统，具有分组交换多媒体终端(1)和用于分组交换多媒体会话的节点(8、9)，并具有服务器(2、3)，用于为所说的分组交换多媒体会话交换多媒体信令信息，并具有终接单元(4)，并为该电信系统提供了网关(7)，用于响应发自所说的分组交换多媒体终端(1)并到达所说的服务器(2、3)的转移消息将分组交换多媒体终端(1)和节点(8、9)之间的分组交换多媒体会话通过交换机(6)转移到网关(7)和电路交换终端(5)之间的电路交换呼叫，以便可能通过替换呼叫来继续中断的会话。

Based on the analysis of interactions between different systems in the network, it is proved that, for a class of complicated linear switched system network, an equivalent model of ordinary linear switched system exists and the corresponding model is given.(4) Block simulation model of linear switched system is established in Matlab/Simulink environment and, moreover, a linear switched system simulation tool with the function of model automatic generation is developed. With the aid of this simulation tool, influence caused by switching sets on stability characteristic of linear switched system is investigated.

对线性切换系统网络中各系统之间的交互作用作了分析，在此基础上证明了一类复杂线性切换系统网络可用等价的线性切换系统模型来表示，并得到了该等价模型；（4）在Matlab/Simulink环境下建立了线性切换系统的框图仿真模型，并进一步开发了具备模型自动生成功能的线性切换系统仿真工具。

Firstly, the recent developments in controllability and observability for switched system are reviewed. Secondly, by means of properties of invariant subspace, the controllability for switched systems with continuous-time and discrete-time subsystems, and a class of discrete impulsive switched systems is respectively investigated. Some sufficient and necessary conditions of controllability are proved. In the end, some simple criterions for controllability and observability of switched symmetric composite systems are set up.

首先介绍了切换系统能控性与能观性方面的一些重要结论；其次，用不变子空间的性质分别研究了同时含有连续子系统和离散子系统的切换系统和一类离散脉冲切换系统的能控性，建立了相应的充分性与必要性判别准则；最后，研究了切换对称组合系统的能控性与能观性，得到了此系统能控性与能观性的简单判据。

the Q-switched 532-nm Nd:YAG and Q-switched 1064-nm Nd:YAG laser can both improve skin elasticity and enhance dermal collagen content, inducing non-ablative rejuvenation,but the Q-switched 1064-nm laser has greater effect than the Q-switched 532-nm laer.

上述两种激光均具有一定的非剥脱性嫩肤作用，但是相比较而言，Q开关1064-nmNd：YAG激光可以取得较Q开关532-nm Nd：YAG激光更为明显的使用效果。

Fine User Interface.And the system was circulated with a man-machine conversation.The purpose to do all of this is just to let computer protract Switched Reluctance Motor with an idea that people alter the parameter of Switched Reluctance Motor.Because Switched Reluctance Motors have a character: although the parameter and size changed ,the structure is fixedness .

该课题主要针对开关磁阻电机的计算机辅助设计，以流行的VisualBasic作为开关磁阻电机软件的开发平台，结合AutuCAD2000关于VisualBasic的二次开发，开发出一个具有良好用户界面的交互性的开关磁阻电机CAD软件系统。

Three antioxidative parameters(SOD super oxide dismutase、MDA malondialdehyde and GSH reduced glutathione hormone)were also measured.Results:The skin elasticity and water content improved increasingly according to the MPA measurements of the two group 4 weeks after the last irradiation.The hydroxyproline of the skin in the Q-switched 1064-nm Nd:YAG laser of 0.6J/cm~2、1.5 J/cm~2 and 2.5 J/cm~2 group showed 7.1%,13.1%and 19.8%(p＜0.05)increase respectively compared to their controls,the enhancement of dermal thickness were 15.5%,29.7%and 38.4%;The hydroxyproline of the skin in the Q-switched 532-nm Nd:YAG laser of 0.5J/cm~2、1.2 J/cm~2 and 2.0 J/cm~2 group showed 6.9%,9.6%and 14.2%(p＜0.05)increase respectively compared to their controls,the enhancement of dermal thickness were 5.5%,15.1%and 29.9%,among which the Q-switched 1064-nm laser group had the greatest effect. The result of antioxidative parameters showed some juvenescence change at the radiated skin.

结果：末次照射后第4周，Q开关1064-nmNd：YAG激光组(以下简称1064 nm组)和Q开关532-nmNd：YAG激光组(以下简称532-nm组)大鼠各实验侧的皮肤弹性和含水量都明显好于对照侧；1064-nm组和532-nm组实验侧的皮肤羟脯氨酸含量和真皮内胶原厚度都较对照组显著增大(P＜0.05)，其中1064-nm组的三种不同能量密度：0.6 J/cm~2、1.5 J/cm~2、2.5 J/cm~2的激光照射的皮肤区域的羟脯氨酸含量增加率为7.1%，13.1%和19.8%，真皮厚度增加率为15.5%，29.7%和38.4%，532-nm组的三种不同能量密度：0.5 J/cm~2、1.2 J/cm~2、2.0J/cm~2的激光照射的皮肤区域的羟脯氨酸含量增加率为6.9%，9.6%和14.2%，真皮层厚度增加率为5.5%，15.1%和29.9%，相比而言1064-nm组的羟脯氨酸及真皮层厚度增加率均较高；抗氧化指标显示两组大鼠实验侧皮肤的抗氧化能力增加，呈年轻化改变。

For the whole switched system, a suitable switched law is designed to ensure: 1 the state of the closed-loop system, at the time of the transition, resides in the stability region of the mode that the system is switched into; 2 the Lyapunov function for each mode is nonincreasing wherever the mode is reactivated, thereby guaranteeing the stability.

对整个切换系统，设计适当的切换律以保证： 1在切换时刻，闭环系统的状态处在切入系统的稳定区域内； 2切入模块的Lyapunov函数是非增的，从而可保证稳定性。

This thesis contributed to the comprehensive study of the Finite-Difference Time-Domain method and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies. The work includes mainly three parts: the study on the performance of PML absorbing boundary condition applied to pseudo low frequency electromagnetic problems; the validation of the FDTD method with PML absorbing boundary conditions and the corresponding computer software based on the numerical study of the electromagnetic field of an electric dipole antenna, and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies; the development of an improved alternating direction implicit finite-difference time-domain method.

在综合前人工作基础上，本文对时域有限差分法及其在开关电源辐射电磁场数值计算中的应用进行了系统的分析和研究，其核心内容包括：伪低频电磁场数值计算中PML吸收边界条件性能的研究；基于基准问题—电偶极子天线三维辐射电磁场，验证了本文构造的基于PML吸收边界条件的三维FDTD法及其计算软件，并应用于高频开关电源辐射电磁场的数值分析；提出了一种改进的交替方向隐格式时域有限差分法。

In this paper we present a converse Lyapunov theorem for globally uniform asymptotically controllably switched systems.And we consider general nonlinear switched systems.

本文对一类全局一致渐进能控的非线性切换系统的控制Lyapunov函数的存在性进行了研究，证明了一个非线性切换控制系统如果是一致全局渐进能控的，那么存在一个公共的控制Lyapunov函数。

"Please accept this talisman as a token of our thanks."

请收下这个护身符以表达我们的感谢。

If I have that magic, I will be more acceptable in the society.

如果我拥有那种魔法，我将更加被这个社会所容纳。