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Based on two algebra Riccati equation method especially the structure of the system Hamilton matrix and system observability theory, the role of invariant zeros in constructing system reduced order controllers was given. That is, by the suitable selection of free parameters of the system H(subscript ∞) controller, some points which were symmetry with the unstable invariant zeros about the imaginary axis became the stable poles of the system controller which were not observable and could be reduced from the system, thus could get further reduced order controller.

基于2代数黎卡提方程方法，特别是系统Hamilton矩阵的结构特点和系统可观测性理论，论述了不变零点在构造系统降阶控制器中所起的作用，即通过选择控制器的自由参量，使某些不稳定的不变零点关于虚轴对称的点构成系统控制器不可观的稳定极点，从而实现了控制器进一步降阶。

Has twoway regulat-ing action to central nerve system, cardio-vascular system, blood system, immune system, incretion system, urinary system, etc.

对中枢神经系统、心血管系统、血液系统、免疫系统、内分泌系统、泌尿系统等具有双向调节作用。

The thesis contains five chapters. The first chapter summarizes the development and research of switched reluctance drive, discusses the main research direction, and explains the main work in this paper. In chapter 2, hardware system which includes the design of power converter and various control circuit is discussed. TMS320LF2407 DSP is used to design the hardware circuits of SRM control system, and design details including the current detection, position sensing, fault protection, speed detecting, keyboard and display etc. are provided. Because of the full use of the abundant peripheral resources of DSP, it comes to the aim simplifying the circuit structure and heightening the reliability. In chapter 3, the application of neural network on SRM control system is introduced, a new the application of neural network and the method of sampling is proposed and a simulation system based on Matlab/Simulink is established. Chapter 4 discusses the routine designing issue. Because the modularized programming method is adopted, and multi-interrupt processing technique is used, operation efficiency of the control software is highly raised. At last, the foregoing SRM control system is tested. Speed adjustment is realized, and other targets on the research and design of SRM control system are reached, which establishes a good foundation for further research.

本文共分五章，第一章概述了开关磁阻电机调速系统(Switched Reluctance Drive，简称SRD)及其发展和研究现状，论述了其主要研究方向，并说明了本文的主要工作；接下来的一章主要讨论了SRM的硬件系统，主要包括功率变换器的设计和各种控制电路的设计，本文以TMS320LF2407为核心设计了开关磁阻电机控制系统硬件电路，给出了包括电流检测、位置检测、故障保护、测速电路及键盘和显示电路等部分电路的详细设计，充分利用了DSP的丰富外设资源，达到了简化电路结构、提高运行可靠性的目的；第三章介绍了人工神经网络在开关磁阻电机控制系统中的应用，提出了一种新的应用方式(利用GPFN神经网络调节PI参数)以及如何采取样本，搭建了基于Matlab/Simulink的仿真系统；在第四章中，讨论了开关磁阻电机控制软件的设计，采用模块化编程方法，采用基于多中断的控制程序，提高了控制软件的效率；最后，对所设计的开关磁阻电机控制系统进行了实验，实现了电机调速，达到了开关磁阻电机控制系统研究和设计的预期目标，为更近一步研究打下了基础。

In Chapter 3, according to the consumer demand, the functional module of the embroidery machine control system is divided, the overall framework of the system is constructed, and the function of each module is analyzed in particular. The CPU chips of master system and slave system, the real-time operating system and the development environment, which are applicable to the embroidery machine control system, are chosen in terms of the lectotype principles.

第三章根据市场需求划分了绣花机控制系统的功能模块，构建了系统总体架构，并分析了每个模块的具体功能；根据选型原则选出了适用于绣花机控制系统的上位机和下位机CPU芯片、操作系统及开发环境。

Through the comparative analysis between the functions of the government"s'role in establishing a social security system in Britain, the US, Germany, Japan and other countries and Chinese government"s absence from their duties in establishing rural social security, we know, under the socialist market economic conditions, the government should bear the basic responsibilities in establishing the rural social security system, just to build a basic framework of the rural social security system adapted to the level of economic development, to establish a rural social security management system, to bear national financial responsibility in establishing the rural social security and promote mufti—dimensionally raising funds, to establish a rural social security monitoring mechanism, to establish a rural social security law system, to create external environment of the rural social security system, and so on.

在英、美、德、日等国构建社会保障制度中政府职能的角色定位与我国农村社会保障政府缺位的比较分析中，我们得出，在社会主义市场经济条件下，构建农村社会保障体系中政府应承担的基本职责，即构建和经济发展水平相适应的农村社会保障制度的基本框架，建立健全农村社会保障管理体制，承担国家对农村社会保障的财政责任并推动多渠道筹集资金，建立健全农村社会保障的监管机制，推动农村社会保障的法律体系建设，创造农村社会保障制度建设的外部环境等等。在当前的条件下，我国政府应着手采取现实可行的具体措施来履行其职能、推进我国农村社会保障体系的建设。

Two degrees of freedom numerical control sliding table based on embedded microcontroller is a typical system of mechantronics. It consists of machine system, electronic information processing system, power system, sensor and measurement system,and actuator system.

基于嵌入式微处理器的两自由度数控滑台是典型的机电一体化系统，包括机械系统、电子信息处理系统、动力系统、传感检测系统和执行元件等。

Simulation results show that the performance of the open-loop control system is poor when the model parameters change. The second system is designed via feedback linearization method. Since the path signal is introduced as feedback signal, the designed closed-loop control system improves the system robustness to the parameter perturbation. Simulation results verify that the closed-loop control system shows better performance than the time optimal control system.

前者侧重于时间最短的控制性能，但由于是开环控制，当出现参数摄动时，系统的性能会受到较大影响；后者由于引入了飞艇轨迹的反馈信号，因而相对提高了系统对参数摄动的鲁棒性，计算量较小，并且仿真结果证实了这种闭环系统设计方案可以抑制参数摄动带来的影响，与时间最优开环控制系统相比，显著提高了控制精度、改善了控制效果。

At first, defined the goal and principle of the graduates unemployment security system; Then by compared the unemployment insurance system and unemployment social salvation system, points out that now establishing the graduates unemployment insurance system is not advisable; from reviewing other countries'experience and our country's actual graduates employment policies, unemployment social salvation system is necessary and possible .At last conclude that such a basic-incorporate graduates unemployment security system should be set up: the government salvation as the base, incorporate the existing employment policies, social salvation and social participancy etc, ensure the unemployed man's living, at the same time develop employment salvation service just like careers guidance training service and so on, the government, the college and graduate individuals should undertake these responsibility together ,and it should be supported by the whole social forces.

大学生失业已经成为一个社会问题，它增加了巨大的潜在社会压力与社会成本，影响社会的稳定；失业保障制度作为一种被动的失业治理政策有其存在的理论基础；政府与社会是大学生失业问题的责任主体，政府公共管理责任与政府战略选择，就自然应竭力减少大学生失业对社会长期发展的威胁，而我国现行失业治理机制在大学生失业保障方面严重缺失；比较而言，目前很多国家都已具备较成熟的青年及大学生失业保障体系，因此必然要求我国尽快建立起大学生失业保障制度体系。

Based on the floating causeway pier system mission requirements and theprinciple of working of the system, the general arrangement of system is studied, andthe pontoon-types and causeway section types constitutes of floating causeway piersystem are analyzed, be after, the primary assemble flow of system is explained in thearticle. For the environmental loading of the floating causeway system, we use theapproximately method of single-ship wind and wave and current static load, affordingnecessarily environmental information and data for the design of floating causewaypier anchor system. Also, based on Load Code for Harbour Engineering, diversified shiploading acting on seaward of the causeway pierhead is quantificational calculationed,preparing for the design of pierhead pontoons and ensuring security and adaptabilityand endure of the pier configuration.

本文根据浮式栈桥码头系统任务需求和工作原理，对整个系统的总体规划进行了研究，分析了构成码头系统所需浮箱的种类和浮箱单元的类型及系统的主要拼装流程；对于浮式栈桥码头系统的环境载荷，本文利用单一船舶风、浪、流静态作用力的经验公式进行估算，为浮式栈桥码头锚泊系统设计提供必要的环境资料及环境载荷数据；本文还按照港口工程载荷规范，对作用于浮式栈桥码头系统向海一端突码头的各种船舶载荷进行定量的计算，为突码头浮箱结构设计作准备，以确保码头结构的安全。

In the information era, there are many multimedia equipments in market, people can not use most of them freely. As a cost-effective system, SVS comes to undertake this role by providing professional large-screen display system and intelligent control system in overall. SVS insist to designing and producing large screen system, covering the products that based on projection technology, such as projector, projection TV, plasma, LCD TV, projection screen, video booth, Whiteboard, writing screen, big-screen mosaic system, matrix interface, video conferencing, central control system and other related accessories.Relying on a high level ideal of "creation and practical", with high-quality technology, market development and service team, SVS is in a fast lane of development. Since was built in 2003, has SVS achieved widespread attention and recognition in field, and established a good relationship with IT media, supporting manufacturers and industry research institutions, always thinking customers' demand and provide specific programs by Symposium, three-dimensional-type promotion, performance monitoring and analysis.

信息化时代，多媒体设备层出不穷，让人措手不及，无法真正去灵活运用，搭配出最佳适合用户需求的高性价比系统，SVS勇于承担这个角色，专业成就大屏幕显示系统与智能化控制系统整体方案设计及制造，SVS自始至终以大屏幕为主线，涵盖了以投影技术为基础或依托所开发、搭配或衍生的产品，包括投影机、背投电视、等离子、液晶电视、投影屏幕、视频展台、电子白板、书写屏、大屏幕拼接系统、矩阵接口、视频会议、中央控制系统及其他相关配件或零组件，公司依托一支具备"作风严禁、勇于创新、讲求实效"的高层次、高素质的技术开发、市场开拓及服务人才队伍，SVS正在惊人地快速发展，自创建以来，已经在业内取得了广泛的关注与认同，与IT媒体、配套生产商以及行业研究机构建立了良好的合作关系，始终以客户的需求为中心，帮助客户提供专项设计方案，专题讨论，立体式推广，效果监测和用户分析等各种服务，最大限度地方便客户，为客户提供解决方案，不断满足客户多样化、个性化、复合化的需要，帮助客户以最少的成本获取最大的收益。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。