xianxing

加权中值滤波，用于图像增强，只用于超声图像，对超声图像去噪有很好的效果。内还包括信噪比计算方法。(weighted median filter for image enhancement, only for ultrasound images of ultrasound image denoising with very good results. Which is also a signal-to-noise ratio calculation.)

通常通过网络分析仪测量信道响应，但网络分析仪的输出为S4P，而信道仿真采用时域冲击响应。本程序将S4P转化为时域冲击响应。(Usually channel response is measured by network analyzer. However the output of network analyzer is S4P and channel simulation use impulse response in time domain. This program converts S4P to impulse response.)

4阶龙格库塔，定义法计算rossler系统lyapunov指数，结果比较精确！(4-order Runge-Kutta, defined method rossler system lyapunov index results more precise!)

k-means clustering is a method of vector quantization, originally signal processing, that is popular for cluster analysis in data mining. k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster. This results in a partitioning of the data space into Voronoi cells.

说明：  Description : This package includes a configurable Simulink model for three different types of DC-DC converters (Buck, Boost and Buck-Boost converters) with a PWM PI controller. The example provided shows a case to boost voltage 5 volts to 25 volts. It can be used to learn DC-DC converters and their control. The model itself also provides an example how to mask a subsystem in Simulink. A HTML and a pdf files are provided to explain the principles of the unform Simulink model for three different types of DC-DC converters. The model does not require other Simulink blocks, such as SimPowerSystems.

The Finite Difference Time Domain Method for Electromagnetics With MATLAB Simulations Atef Elsherbeni and Veysel Demir Chapter 6

对心直动凸轮机构压力角的计算，能够实现简单的计算，属于基础教程(On the heart straight moving cam pressure angle computation)

1588高精度时间同步协议（PTP协议）的学习总结，希望对大家有所帮助(1588 Precision Time Synchronization Protocol (PTP protocol) study concluded, I hope to be helpful)

一个基于Lloyd-Max算法的最优量化器程序，其中lloydmax为主程序(Lloyd-Max quantization algorithm for the optimal procedure, lloydmax which mainly procedures)

讲解调频连续波雷达波形(SFCW)设计的仿真程序(a matlab source code for SFCW waveform)