通信系统

Through the study of PLC working principle and PLC network communication basic theory, it is a main purpose to master the cruces of realizing PLC control system, the control process and control mode, PLC topology structure and communication protocol between sub network.

通过对PLC的工作原理及PLC网络通信的基本理论的研究，达到在构建PLC工业控制系统时掌握PLC实现控制的要点、控制过程和控制方式以及PLC控制网络拓扑结构和各级子网通信协议配置原则的目的。

In the system design, the communications between epigynous PC and hypogynous SCM follows the RS-232 criterion, AT89C51 chosen as core hardware, voltage conversion circuit, display circuit, data collection circuit are introduced.

在系统设计中，上、下位机的通信采用RS—232标准，选用ATMEL公司的89C51单片机作为核心硬件，设计了电平转换电路、显示电路、数据采集电路等；软件部分采用VB6.0作为开发工具，采用模块化设计方法，对串口通信模块、滑动轴承油膜压力测试模块、打印预览模块、滑动轴承摩擦特性实验模块等模块进行了设计与说明。

In contrast, Web isits are structured consultations focused on nonurgent chief complaints (e.g., cough), inoling menus of questions tailored to the problem, brief answers by the patient, and a response from the physician proided within a certain period.

我们采用的电子医疗模型除了可以安全地进行网络信息交流以外，主要提供以下四项服务：在线预约安排，电子处方补充，综合的通信联系，医生的系统登陆。综合的通信联系使病人可以在线咨询一些简单的问题，从而减少了许多电话访问（如，我下次就诊之前需要先拍一个胸片吗？

The system, which includes an industrial computer as the Upper-Computer and twenty PLC as the low-computer to control more then 40 sulphuration machines, can transmit data by RS-485 net work, get the work state of sulphuration machine using on-off card or by communicating with PLC and show the state on the watch screen.

控制系统由一台工控机作为上位机，由20台PLC作为下位机控制工作现场40多台硫化机的工作，采用RS485作为通信网络进行数据传输，通过开关量卡以及与PLC的通信得到硫化机的工作状态并在监视屏幕上显示。

You can release soft equipment conforming to standard protocol along with equipment suppliers, and provide emulation of network integration solutions and synchronistical update to integrated network management.

系统采取拥有自主产权的中间平台，针对不同的网络类型可以动态接入符合该网络类型下的各种设备，根据设备是支持某种通信协议下的端口组合，可以根据协议的发展与通信设备厂家同步推出符合标准协议的软设备，提供组网集成方案的仿真实现和综合网管的同步更新。

The system includes main server program algorithm, sub-server algorithm and client algorithm. It solves communication problem between all the processors and evolutes scheme design and detail design hierarchically and synergically.

最后建立分布式并行计算环境，设计基于遗传算法的基坑支护分布式三层协同演化系统，分别构造主服务程序算法和子服务器算法程序及客户机输入界面，解决客户／服务器之间的通信、主服务器与子服务器之间的通信问题，对方案和细部、细部和子细部进行分布并行协同搜索，获得出最优方案。

Considering present network layer"s complicated and disordered scenery leaded by communicating among various application with different communication protocols and technologies, this dissertation puts forward and implements shield of complicated network communication with standard protocols of TCP/IP, UDP in middle layer and Socket network programming technology, which can greatly alleviate application software personnel"s workload, ease its technical difficulty, and enhance system universality and transplantability.

针对目前各种应用采用不同技术进行网际通信而导致网络层复杂、混乱的局面，本文提出并实现了在中间层采用TCP／IP、UDP标准协议以及Socket套接口网际编程技术来屏蔽复杂的网络通信，大大减轻了应用软件人员的工作量和技术难度，并且使系统具有良好的通用性和可移植性。

The trunking communication plays very important part in the police detection, and the information security of communication needs high level protection.

公安集群通信是公安系统办案过程中非常重要的辅助手段，通信信息的安全性具有很高的要求。

The vehicle detection subsystem uses loop vehicle detector. The bus detection and location subsystem uses the beaconing location technology. The intelligent signal controller accomplishes real-time and adaptive traffic control. The communication subsystem accomplishes the communication among every part in the system. The system control center accomplishes the correlation and integration among subsystems.

其中，车辆检测子系统采用环形线圈检测器；公交车检测与定位子系统采用信号标杆定位技术；智能信号控制器实现实时自适应、智能化的信号控制；通信子系统完成系统中各部分之间的通信；控制中心完成各子系统之间的相互联系和集成。

The technical routes and methods proposed in the thesis are not only theoretically meaningful but also are great valuable in HF communication coutermeasures. Some of the methods have been applied to a HF reconnoitering system and the result of the field is fairly well.

本文提出的技术路线和实现方法，不仅具有一定的理论意义，而且在短波通信对抗中也具有重大的应用价值，其中的部分算法已应用于某短波通信侦察系统中，取得了较好的效果。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。