tcl code for topology creating

modbus协议全解，modicon公司编写的协议，很权威，很有参考价值。-modbus protocol the whole solution, modicon the company prepared an agreement, it is authoritative, useful reference value.

about cognitive radio in wireless communication

微软亚洲研究院论文：移动自组网中的基于服务质量的资源查找框架-Microsoft Asia Research Institute Papers : Since the mobile network based on the quality of services and resources to search framework

虽然Windows下可视化开发工具如VC、Delphi、C＋＋ Builder等都有专用的定时器控件Timer，而且使用很方便，可以实现一定的定时功能，但最小计时精度仅为55ms，且定时器消息在多任务操作系统中的优先级很低，不能得到及时响应，往往不能满足实时控制环境下的应用。不过Microsoft公司在Win32 API函数库中已经为用户提供了一组用于高精度计时的底层函数，如果用户使用得当，计时精度可到1ms。这个计时精度、对于一般的实时系统控制完全可以满足要求。现将由C＋＋ Builder 4.0提供的重新封装后的一组与时间相关的主要接口函数（函数名、参数、功能与Win32 API基本相同）说明如下： -visual development tools such as Visual C++, Delphi, C++ Builder and others all have dedicated Timer timer control, but it is convenient. can achieve a timing function, but only the minimum time of 55 ms accuracy. Timer news and multi-task operating system in the low priority that is not to respond in a timely manner, often fail to meet the real-time control environment applications. However, Microsoft Corporation in the Win32 API function has been to provide the user with a group for high-precision the bottom was a time function, if the user is properly utilized, time accuracy can be a ms. Accuracy this time, and for most of the real-time control system can meet the requirements.

PWLib DLL libraries, OpenH323 DLL libraries-Gnome DLL libraries, OpenH323 DLL libraries

evc写的gps示例程序-evc write gps sample program

利用VC编写的串口程序，可工作于两种模式，普通模式为文本模式，CCD模式为与单片机通信按规定协议传输图像。-VC prepared using serial procedures, can work in two modes, normal mode for the text mode, CCD mode with the single-chip communications in accordance with the provisions of the agreement to transfer images.

一个由台湾人编写的课程设计---IP多播 流媒体影音传输，涉及到视频采集，编码（directshow），传输（jrtplib），解码，播放。我做毕业设计时参考过。 其中包括整个程序的框架说明ppt，相信对大家非常有用，其中注释为繁体中文，可用ue阅读源文件，不过不是很多。-The people of Taiwan to prepare a curriculum design--- IP multicast streaming media audio and video transmission, related to video capture, encoding (directshow), transmission (jrtplib), decoding, playing. I have graduated from the design reference. Including the framework that the entire process ppt, believe that very useful for all of us, including the Notes, Traditional Chinese, ue can be used to read the source file, but not many.

TCP/IP祥解 卷一:协议。作者（美）W.Richard Stevens 机械工业出版社 -TCP/IP xiang, XIE Volume I : protocol. The author (American) Richard W. Stevens Machinery Industry Pre

QAM调制的基本原理 QAM调制实际上是幅度调制和相位调制的组合。相位 + 幅度状态定义了一个数字或数 字的组合。QAM的优点是具有更大的符号率，从而可获得更高的系统效率。通常由符号率 确定占用带宽。因此每个符号的比特（基本信息单位）越多，效率就越高。-QAM modulation of the basic principles are in fact QAM modulation amplitude modulation and phase modulation of the portfolio. Phase+ margin status defines a combination of numbers or figures. The advantage of QAM symbols are greater rate, thus the system efficiency will be higher. Symbol rate is usually determined by the occupied bandwidth. Thus each bit symbols (basic units of information) the more the higher the efficiency.