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一个小巧的PHP+mysql的留言板源码，非常简练美观-A compact PHP+ Mysql message board source code is very concise and beautiful

计算轮轨接触,包括接触斑的大小。kalker系数等等，包括其系数(Calculation of wheel/rail contact, including the size of the contact spot. Kalker coefficient and so on, including its coefficient)

This book guides software professionals through the traps and pitfalls of developing efficient, portable, and flexible networked applications. It explores the inherent design complexities of concurrent networked applications and the tradeoffs that must be considered when working to master them.

说明：  lbc_example：未编码的BPSK调制的性能（理论计算与仿真）、重复码硬判决的性能 lbc_example_SD： 未编码的BPSK调制的性能（理论计算）、重复码硬判决的性能、重复码软判决的性能 lbc_example_SD_EbNo：lbc_example_SD中的性能，并且进一步考虑了码率不同时，对于信道的SNR值进行归一化，以Eb/No = SNR/(2*R)为横坐标时的比较结果 lbc_example_Hamming_EbNo：汉明码，硬判决译码的性能(Lbc_example: Performance of uncoded BPSK modulation (theoretical calculation and simulation), performance of duplicate code hard decision Lbc_example_SD: Performance of uncoded BPSK modulation (theoretical calculation), performance of hard decision of duplicate code, performance of soft decision of duplicate code The performance of lbc_example_SD_EbNo: lbc_example_SD is considered, and the SNR value of channel is normalized when the bit rate is different. The comparison results are obtained when Eb/No = SNR/(2*R) is the abscissa coordinate. Lbc_example_Hamming_EbNo: Hamming Code, Performance of Hard Decision Decoding)

网络五子棋，可以进行局域网和广域网的互联游戏，具有悔棋，保存，等功能。欢迎下载！-network, LAN and WAN connectivity games, with he never cheat in spain, preservation, and other functions. Welcome to download!

XP系统清理源码，例程程序调用API函数实现XP系统临时文件的清理。(XP system clean source , routine program calls API functions to clean XP system temporary files.)

一个聊天室的程序框架，可重用代码！实现自己的功能！-A chat room Framework, reusable code! Realize the function of their own!

实现远程监控设备的数据采集与维护主要实现如下功能：登记，通道选择，实时监控,录像，保存，播放，快速／慢速播放，暂停／恢复,单帧播放／单帧回放，抓图功能，分辨率设置等功能-Remote monitoring equipment for data acquisition and maintenance of the main achieve the following functions: registration, channel selection, real-time monitoring, recording, save, play, fast/slow play, pause/resume, single-frame play/single-frame playback, drawings function, resolution setting and other functions

说明：  ：载波频率偏移是OFDM系统实现的关键问题之一。分析了OFDM 系统载频偏移估计的2 种算法，即利用循环前缀和训练序列方法。它们均为最大似然估计方法。分别讨论了它们的基本 思想、实现方法和仿真结果。可以看出基于循环前缀算法复杂度较小，精度不高，而基于训练序列 的算法有较高的估计精度，但降纸了系统传输效率。(Abstract：Carrier frequency ofset is one of the key problems in OFDM system．Two foundational methods 。cycling prefix—based and training sequence—based algorithms。to estimate OFDM carriers~equency ofset are analyzed．Then it discusses their basic thoughts。implementing methods and simulation resuits． Finally。merits and demerits of every algorithm are supposed．It concludes that the cycling prefix— based algorithm has less complexity and less precision。and that the training sequence—based algorithm has better estimation performance at the cost of transmission efficiency．)

Lunar Navigation Architecture Design Considerations