通信系统

Limited bandwidth and high delay make application very difficult to archive good performance. In this dissertation, we have developed optimal collective communication library CAMPI for campus area based on MPI collective communication operation and have taken hierarchical network structure into account. In CAMPI, the number of clusters in system must be specified. We also must show which process belongs to which cluster.

本文充分考虑到网络的等级体系结构，针对不同的网络情况，在MPI集合通信的基础上提出了基于校园网系统的优化集合通信操作库CAMPI(campus area message passing interface)，它建立在MPI操作库之上，在CAMPI操作库中需要指定整个系统中有多少个机群，哪个进程属于哪个机群，CAMPI操作库在MPI之上实现，系统中必须首先安装MPI实现，例如最常用的MPICH。

A database communication network system has an entertainment system (12) comprising an entertainment apparatus (102) to which a portable information communication terminal (32) is detachably connected.

数据库通信网络系统具有娱乐系统(12)，所述娱乐系统(12)包括娱乐设备(102)，便携式信息通信终端(32)可拆卸地与所述娱乐设备(102)相连。

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。

It is a kind of information system that can provide the decision-making and dynamic help to communication resource's system.

通过地理信息系统，进一步整合电力系统通信资源，可以适时的提供空间的和动态的系统信息，为通信资源的管理提供动态的帮助和决策的支持。

By download cable to download the appropriate procedures, While controller can be used as the core control system in the independent mode, from the light sensor acquisition of position information, after TLC0838 conversion SCM independent, and the final results sent to the data processing system of the robot executing agencies -- servo control system implementation; the other hand, through the MCU serial communication interface with the PC establishment of communication links, controller work in the PC expansion board functional model.

通过下载电缆下载相应的程序，一方面控制器可作为系统的控制核心工作在独立运行模式，即由传感器采集光源的位置信息，经过TLC0838转换后单片机可以独立进行处理，并将最后的处理数据结果送往机器人系统的执行机构——舵机控制系统执行；另一方面，通过单片机的串行通信接口与上位机建立通信联系，使控制器工作在PC机功能扩展板模式。

As the nerve center of C〓I system, the communication network is the basis of carrying out automatic command in modern war, the performance of it is good or bad affects the survival and function of the whole C〓I system fatefully.

C〓I系统通信网络作为系统的中枢神经，在现代战争中，是实施自动化指挥的基础和军队作战的命脉，通信网络性能的好坏对整个C〓I系统的生存和功能发。。。

According to actual condition, a model of wall thickness of rotary kiln is established. The constant coefficients in the model, including thermal conductivity, heat transfer coefficient, Fourier coefficient and contact resistance, are closely calculated. A formula of contact resistance is draw from a great deal of data of surface and inner temperature of rotary kiln. The wall thickness of rotary kiln is simulated by MATLAB. The simulation result is transmitted from MATLAB to DELPHI through a group of interface functions compiled by VC++. The basic graphs-circle and line are analyzed by the means of the technique of Visualization in Scientific Computing and the Bresenham arithmetic, and are realized the visualization of the wall thickness. The contents of communication between master computer and slaver computer are designed and the error control technique, the idea of multi-thread and the embedded assembly language are applied to realize the temperature data transmission and graph transmission, which largely improved the speed of transmission and the reliability and stability of system.

建立了符合现场实际的回转窑壁厚数学模型；结合现场采用红外测温仪测量所得的温度数据和回转窑的实际结构数据，确定出适合该模型的定常系数(包括导热系数、换热系数、傅立叶系数、接触热阻等)，并得出与回转窑工况的相近的接触热阻公式ln=T~(0.5154)-36.7868；利用MATLAB软件仿真出回转窑壁厚，并将运算结果通过在VC++的编译环境下编译出MATLAB和DELPHI的接口函数传输到该监测系统中，实现了温度数据的转换和交换；运用科学计算可视化技术和Bresenham扫描转换算法对基本图形——圆和直线进行分析，从而实现了仿真后的壁厚数据可视化；在研究异步串行通信方式的基础上，设计了该系统上下位机功能和通信内容，并运用差错控制技术、多线程思想以及嵌入式汇编语言实现了温度数据和图形数据在上下位机之间的远程传输，提高了数据传输的速率和系统的可靠性、稳定性。

In the field of industry control , Many machine mailing address are used by the majority of supervisory system to complete the data acquisition and the management duty. In order to save the movement cost the host from the type structure is used generally by us.

摘 要：在工业控制领域，大部分监控系统均采用多机通信方式完成数据采集、管理任务，为节约运行成本普遍是采用主从式结构，本文设计采用RS－485标准进行主从式多机通信网络系统可大大简化系统结。。。

Then the implementation scheme of multimedia communication terminal based on PC is presented, and the structure of hardware and software is given.

多媒体通信技术可分为三部分：即多媒体通信终端技术、支持多媒体业务的通信网络和多媒体通信应用系统。

A narrowband interference has a greater power spectral density. Thus it will bring more strong devastation to the DSSS system than a broadband one does.So it is difficult for DSSS system to ensure a high quality of communication by itself when strong interference exists, even communication may be intermitted.

窄带干扰(Narrow-Band Interference，NBI)由于其功率谱密度比宽带干扰高得多，所以它对DSSS系统的破坏性更强，当有强窄带干扰存在时仅靠系统自身的抗干扰能力很难保证系统高质量的通信，甚至可能造成系统通信中断。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。