切换

This paper precisely conducts the special topic research in view of some important technologies of the digitized control module.(1) AC motor control circuit of PAN/TILT is designed ,which speed is controlled by AT89C51 MCU. DC motor control circuit of LENS is designed too.(2) The hardware and software of automatic temperature control is designed, which used in camera protect box without A/D IC. A kind of single wire communication IC is used in the circuit. So, the program is given.(3) A method of video switch without picture shock is discussed in this paper, and 16x8 video switch circuit is designed. AT89C51 can carry out time sequence logical control with the sync signals by request..(4) The module of real-time clock is designed, in which, LCM is used, a kind of three-wire communication IC is used too.

1给出了一种由89C51单片机控制的简单易行的交流云台转动变速控制电路，实现了云台及其电动三可变镜头的控制；(2)给出了无需外加A/D、单线通信的防护罩自动温度控制电路，完成了单片机温度控制软件的设计；(3)提出了"无抖动"视频切换的设计思想，给出了16×8的视频切换电路，利用单片机在视频信号的场消隐期控制切换，从而实现了"无抖动"切换；(4)给出了一种三线接口通信的液晶显示实时时钟电路，完成了程序设计；(5)提出了在视频监控系统数字控制模块中，用CAN总线取代传统的RS-485总线，实现PELCO-P协议传输的方案。

Simulation results show that Fast RSVP scheme, compared with other traditional RSVP extensions for mobile environments, has the following advantages:(1) it realizes a mobile node handover with QoS guarantees;(2) it avoids resource wasting caused by triangular routes and duplicate reservations in mobile IP handover process;(3) it distinguishes different types of reservation requests, greatly reducing the handover session forced termination rate while maintaining high performance of the network.

仿真实验结果表明，与其他移动环境中的RSVP扩展方案相比，该Fast RSVP方案在支持无线移动通信方面具有如下优势：(1)能够实现移动节点带有服务质量保证的快速切换；(2)能够避免移动IP切换过程中三角路由和重复预留造成的资源浪费；(3)能够区分不同类型的切换预留请求，在保证网络整体性能的前提下显著降低因为切换而导致的服务中断率。

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。

Then an in-depth analysis and comparison between anticipated hard handover and two network interfaces soft handover are performed. Based on that, we propose two paths IP soft handover and its algorithm. The entire algorithm includes second capsulation algorithm of train part and decapsulation and data recovery algorithm of railway and control center part.

通过分析和比较预扫描硬切换和双网络接口软切换，本文提出了双路径IP软切换方案并设计了双路径IP软切换算法，整个算法包括车载部分的二次封装算法和轨旁及控制中心部分的解封装和数据还原算法。

Constitution:the button-sewing machine comprises:a fixing means 构件 for fixing a buttonand an article being sewn;a moving means for moving the fixing means to stitch the button to the article being sewn with seams of a specified sewing pattern; a fixed blade; a moving blade for drawing a thread and then moving to cut the thread by the cooperation with the fixed blade;and a button,wherein the machine has a control means for controlling a fabric transferring means to move the button to a preset position before cutting the thread.

一种钉扣机，设置有布料保持件的可动、固定切换机构，该切换机构在钉扣缝制时可在以下两种状态之间进行切换：将布料保持件固定保持在规定位置上从而停止该布料保持件在左右方向上的移动的状态、或者解除对布料保持件的位置固定从而使该布料保持件通过可动台与纽扣保持件一起在前后方向、左右方向上移动的状态，在该切换机构上安装有可在左右方向上的一定范围内调整布料保持件的固定保持位置的位置调整机构，由此可使整体结构简单，可实现小型化、轻量化及低成本化，且即使在将柔软的布料作为缝制对象时也不会出现缝制褶皱等，另外，无论线的种类和粗细如何，都可进行缝制品质高的钉扣。

According to the problem that grating scale hardly achieves high resolution when in high speed and the characteristic of high speed high precision system,this paper presents across dimension displacement measuring method based on dual grating scales dual measuring,the counting values of dual grating scales switch and merge.

在分析光栅线性位移测量原理、光栅尺的测量误差尤其是细分误差的基础上，本文重点研究双光栅尺切换与合成的原理，建立了基于双光栅尺高速高精度位移测量的设计准则，根据设计准则设计了切换基准拾取方法以及快速切换与合成方法，分析了双光栅计数值切换合成的误差。

Base on the analysis of the grating linear displacement measurement theory,t he measure errors especially the subdivision error of the grating scale,this paper focuses on the theory of switch and merge of dual grating scales'signals,builds the design criteria of high speed high precision displacement measurement by using dual grating sales,designs the switch picking reference with high precision and fast switch and merge method,analyses the errors brought in by switch and merge of the duals grating scales.

针对光栅尺的电子细分信号具有细分误差的特性，本文提出了对莫尔条纹信号不细分的方法以提高双光栅尺信号切换合成值的精度。经过对双光栅计数切换基准、切换与合成特征和规律的探讨，本文设计了实现双光栅尺双重测量、计数值切换合成法的硬件电路，主要通过可编程芯片FPGA，设计了双光栅尺信号处理的各电路模块，如双光栅尺信号四倍频辨向模块、速度判断模块、切换模块、计数值合成处理模块。

The thesis analyses the performance of handovers for mobile IPv6, and proposes a no-predict fast handover method tunnel-based, which is implemented easily.

本文研究了移动IPv6的跨区切换技术，分析了移动IPv6的切换延迟，针对目前移动IPv6快速切换策略实现难度大的问题，提出了更易实现的一种基于隧道的非预测式快速切换策略。

It can also reduce the handover frequency, hold the continuity of the correspondence and make the load of MAP balance when handovers occur.

这个模型是通过使用非固定的MAP域管理，针对单一移动节点的逻辑管理域，解决移动节点在域间切换和域内切换时的通信延时问题以达到降低切换行为的发生频率、保持切换发生时通信的连续性、使MAP负载均衡等目的。

The method includes the following steps: step A, the terminal accesses, registers and loges on to IM core net through at least two different wireless IP access networks; step B, in the process for carrying a VoIP communication through at least one of two IP access networks, if the terminal meets the pre-set switching condition between the IP access network, a switching request in the IMS domain is initiated; step C, the speech calling continues application server receives the switching request, and switches the signaling between the terminal and the VCC application server to the other IP access network except the IP access network loading the VoIP communication at present in at least two IP access networks.

本发明提供一种IMS域内VoIP的切换方法、IMS系统、终端及VCC应用服务器，该方法包括：步骤A，终端通过至少两个不同的无线IP接入网接入并注册登录到IMS核心网；步骤B，在终端通过至少两个IP接入网中的一个进行VoIP通话的过程中，如果终端满足预设的IP接入网之间切换条件，则发起IMS域内的切换请求；步骤C，语音呼叫连续应用服务器接收切换请求，并将终端与VCC应用服务器之间的信令切换到至少两个IP接入网中、除当前承载VoIP通话的IP接入网之外的其中一个IP接入网上。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。