qigangdain

说明：  拓扑图常见，用于各行业网络拓扑，及网络技术规划(Topographic maps are commonly used for network topology and network technology planning in various industries.)

2013年全国大学生电子设计大赛题目汇总 1.A到G为本科组题目 2.J，K，L为专科组题目 (The 2013 national undergraduate electronic design contest title 1. A to G for undergraduate group of subjects 2. J, K, L for specialty group of subjects )

vss项目版本管理软件，本文档详细的介绍了VSS的使用方法(vss project version management software, this document describes in detail the use of VSS)

linux用命令安装oracle 不需要显示图像 可以用终端安装(linux with the command to install oracle)

最好的点对点（PPP）学习文档，当年学习总结，希望对初学者有所帮助。(The best peer to peer (PPP) learning documents, then learning summary, I hope to help beginners.)

说明：  从南瑞继保某现场技术人员电脑中偷搞的,关于103规约通讯的技术要点.别被南瑞的发现了,阿门!(err)

这是一个关于递归算法原理的解释，很不错，请大神指点。(This is a recursive algorithm on the interpretation of the principle, very good, please great God pointing.)

说明：  目前牵引变压器差动保护原理在某些因素的影响下并不能准确地区分变压器内部故障和外部故障，可能造成保护误动或拒动，危及电气化铁道系统的安全运行。针对这一现状，建立了计及铁芯非线性特性和磁滞效应而又无需铁芯的B－H曲线数据的牵引变压器模型，提出了一种通过参数辩识理论来辩识牵引变压器绕组参数实现牵引变压器微型机保护的方法。该方法能有效地区分内部故障、外部故障和励磁涌流。仿真计算表明了该方法的正确性和可行性。(Traction transformer differential protection principle in the safe operation and can not accurately distinguish between the transformer internal faults and external faults, may be to cause protection mistaken or refuse to move, endangering the electrified railway system under the influence of certain factors. In response to this situation, taking into account the core nonlinear characteristics and hysteresis and without traction transformer core of the B-H curve data model, a the traction transformer winding identification through parameter identification theory parameters to achieve traction transformer microcomputer protection. This method can effectively distinguish internal faults, external faults and magnetizing inrush current. The simulation results show that the correctness and feasibility of the method.)

Oracle的安装是一项比较复杂的工作，本文提供了清晰的操作步骤(A guide directing you to install Oracle on RedHat 5)

office使用小诀窍，详细介绍了office组件的各种简单的快捷的操作方式，对于办公室人员是很好的助手。(Office use tips, detailed introduces the office components, different kinds of simple and quick operation is a good helper for the office personnel. )