通信性

Because of the autonomy, mobility and communicativeness of agent, the transaction is very efficient, especially for large-scale distributed database systems.

由于Agent具有自治性、移动性和通信性，使得事务的执行效率更高，尤其适用于大规模的分布式数据库系统中。

In order to improve the modernization and convenience of communication network,the given design and key applied technologies of management system based on GIS,which is about long-distance communication trunk transfer network,take advantage of vector maps and dynamic data exchange of GIS.

为提高通信网管理的现代化和易用性，利用GIS系统的矢量地图和属性数据动态交互的优势，给出了基于GIS的长途通信干线传输网络管理信息系统的设计方案及其关键的实现技术，从而很好的解决了长途通信干线网络资源的地域性和空间性难以描述的问题，大大增强了系统的操作性和信息表现能力。

Firstly, the characteristics of CAN bus are analyzed and it's reliability、expeditiousness and flexibility are tested. A communication network of substation automation system constructed on CAN bus is presented and confirmed. Secondly, the dissertation discusses the main structure of substation automation system, as well as the content and request of substation digital communication. According to this, it gives the project of constructing the substation CAN communication network and the communication protocol. And according to different requests of power system, it makes research and tests of the calculation of the communication parameters in the network. Communication manager is the key to communication network based on CAN bus.

论文首先分析了CAN总线的特性，对其可靠性、实时性、灵活性进行了实践验证，确定了用CAN总线来构建变电站综合自动化系统数据通信网络的可行性，并在对变电站综合自动化系统的结构及数据通信的内容和要求做了研究和分析的基础上提出了基于CAN总线的变电站综合自动化数据通信网络的构建方案，编制了相应的基于CAN总线的变电站综合自动化系统通信协议，同时针对电力系统的不同要求，对CAN总线通信网络中通信参数的计算进行了研究和验证。

In order to investigate the variation of controllability and observability affected by network scheduling,the model of scheduling for Networked Control System is established,which has communication constraint on its input and output channel.Utilizing communication sequence to express the scheduling of channel,the model can be transformed into discrete-time switch system.Under static scheduling,using the theory of recursive invariant subspace and its character,a necessary and sufficient condition of NC...

为了研究网络调度对能控性与能观性的影响，对输入、输出通道都存在通信约束的网络控制系统的调度进行建模；利用通信序列表示通道的调度情况，最终将模型转化为离散切换系统；在静态调度下，利用循环不变子空间理论及其相关的性质，给出了网络控制系统能控性、能观性成立的充要条件，并给出了原有控制系统与经网络静态调度后的系统之间能控性、能观性的关系；最后用仿真实例说明了所提结论的正确性。

The network based on the ARM and the TCP/IP stack of uClinux provides the on-line GIS mo rnito ring system w ith stable communications and interchangeability. The ARM kernel in the embedded system p rovides a stable on2line monito ring system w ith real2time p rocessing capability and extendability.

应用测试结果表明：基于 ARM 和 uClinux 中TCPIP 协议栈的以太网通信，可以实现 GIS 在线监测系统的互操作性，并保证在通信功能上的长期稳定性；以 ARM 为核心的嵌入式系统硬件，可以保证监测装置的稳定性、实时性和可扩充性。

The eCAN module in the signal processor TMS2812 is introduced. Its correspondence partial hardware and the software design method with the CAN bus between correspondence is given. The OPC server is used for host, slave computer I/O driver, which has enhanced the ability of the scene intelligence measuring appliance computation complexity and system real-time communication.

详细介绍TMS2812信号处理器的eCAN模块以及其与CAN总线之间的通信，并给出其通信部分硬件和软件的设计方法，采用OPC服务器为上、下位机的I/O驱动程序，满足了现场智能仪表的计算复杂性和系统通信的时实性。

At the same time, on the base of analysis of the present situation, the development trend and the leading edge technology, the necessity and feasibility about the exploitation of the full hydraulic bulldozer"s sate monitoring and fault diagnosis system is given; According to the structure, working feature and working environment, it works out system schema and system composition; The system is divided into display module, communication module and fault diagnosis module by means of block design, the implementation method and key parameter are also given; In light of the features of the full hydraulic bulldozer, the state monitoring and fault diagnosis platform composed of controller RC6-9 and display DI2/10 is designed based on CAN-Bus and the hardware design is completed; It lists the measured values and state of monitored parameters which should be real-time displayed in monitoring module as well as the data which will be transmitted; Furthermore, On the base of the study of, it gives 34 kinds of constant faults" diagnosis methods; Using BODAS software and DPS software, it compile the program code of the controller and the displayer; At last, this paper design and make the simulation test device of control system of construction machinery, through the experiment, the realizability, the categoricalness, the reliability, the stability and real-time are tested, in addition, the improved methods are given.

本文收集整理了国内外智能推土机研究的相关文献资料，综合分析了国内外智能推土机的研究现状、发展趋势和前沿技术，论证了开发全液压推土机智能系统的重要组成部分&全液压推土机状态监测与故障诊断系统&的必要性和可行性；根据全液压推土机的结构、作业特点和作业环境，制定了全液压推土机状态监测与故障诊断系统方案，确定了系统的结构组成；采用模块化设计方法，将整个系统分成了显示、通信和故障诊断三个模块，给出了各模块功能的实现方法，确定了各模块的关键技术参数：选用RC6-9和DI2／10作为系统的控制器和显示器，用CAN总线搭建了系统的通信平台，完成了系统的硬件设计；确定了系统监测参数和通信数据，对全液压推土机常见故障特征进行了分析，给出了34种常见故障的诊断方法；在BODAS软件和DPS软件的集成编程环境下，编写了控制器和显示器程序；设计并制作了工程机械控制系统模拟试验板，并在此基础上通过多次的程序调试与试验，对所设计的全液压推土机状态监测与故障诊断系统功能的可实现性、完备性、可靠性、稳定性和实时性进行了检验，证实了此系统的可行性，并提出了进一步的改进方案和措施。

The requirement of real time sex that line of make a present of protects pair of communication quickly is relatively inferior , because this is OK ,the consideration uses low cost but the wireless communication technology with real time wronger sex .

馈线快速保护对通信的实时性要求相对较低，因此可以考虑采用低成本但实时性较差的无线通信技术。

A method for the calculation of the ground potentials when the telecommunication equipment and other ground pipes buried metal pipes or metal sheathes of cables are influenced by the resistive coupling is suggested .

分析了层式土壤情况下强电系统与通信系统间的阻性耦合特性，给出了通信设备及其它地下金属管线或埋电缆的金属屏蔽体遭受阻性耦合影响时的地电位计算公式。

It not only provides lower computation and communication, but also message confidentiality, authentication, unforgeability, non-repudiation, resisitance of malicious verifiers cheating others and so on, thus it satisfies the request of group communication and has great practical value and application prospect for the restriction of storage and computation developed hardware.

该方案综合了对称加密、 Shamir 门限方案和 Junn 方案的优点，除了计算量与通信量少外，还具有保密性、认证性、不可伪造性、不可否认性、抵抗接收组成员欺骗等特点，满足群体通信的要求，对存储容量和计算能力有限的硬件开发而言，该方案具有很大的实用价值和应用前景。

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。