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期望最大化算法。假设数据服从高斯分布时，用于寻找全局最优解。(Expectation-Maximization algorithm)

球钟问题描述:球钟是一个利用球的移动来记录时间的简单装置。它有三个可以容纳若干个球的指示器：分钟指示器，五分钟指示器，小时指示器。若分钟指示器中有2个球，5分钟指示器中有6个球，小时指示器中有5个球，则时间为5:32。(Ball bell Problem Description: Ball Clock is a use ball movement to record the time of simple devices. It has three balls can accommodate a number of indicator: Indicator minutes five minutes indicator, hour indicator. If the indicator is 2 minutes balls for 5 minutes with six balls indicator, hour indicator has five balls, the time is 5:32.)

点击按钮出现弹框的效果，界面已经美化可以自己开发(Click on the pop-up effect)

DOS下仿造WIN9X-DOS imitation WIN9X

有线传输系统的显示原理图和PCB，请有用的大家来下载，谢谢。-Cable transmission systems display schematics and PCB, please download useful to you, thank you.

基于单片机的智能路灯照明控制顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶(Intelligent street lamp lighting)

说明：  网侧仅输出有功功率，网侧电压与电流同相位(SVG The grid side only outputs active power, and the grid side voltage and current are in phase.)

说明：  简单的指纹识别系统，包括增强、二值化、细化、匹配等(Simple fingerprint identification system, including enhancement, binarization, thinning, matching and so on)

说明：  利用comsol实现了空腔谐振腔（矩形，圆柱，球形）的仿真，并实现了谐振频率和品质因数的测量。(The simulation of cavity resonator (rectangular, cylindrical, spherical) is realized by COMSOL, and the resonant frequency and quality factor are measured.)

输入海水温度、盐度等参数，能够计算不同频率下的海水介电常数(sea water dielectric constant)