pca_analysis

优秀论文及配套源码。电压暂降是动态电能质量问题中最受关注的热点之一。大量新型电力电子设备的广泛使用对电网电能质量的要求越来越高，而且电压暂降在电网中又具有一定的传播性。因此，无论从电网还是用户都迫切需要对电压暂降进行研究和治理。对电压暂降的检测是解决电压暂降的前提条件，故本论文主要对电压暂降的检测方法进行研究。 本文分析了国内外短时电能质量扰动检测的研究现状，并着重讨论了短路故障、感应电动机启动和变压器激磁三种电压暂降扰动情况下电压暂降的特性；在此基础上选择了基于S变换的短时电能质量扰动检测方法，从S变换的结果S模矩阵及S复矩阵中提取出所需数据并以此来对各种扰动情况下的电压暂降的幅值、相位跳变、持续时间和谐波含量进行分析。仿真结果表明，该方法很好地实现了对电压暂降各特征量的检测。 (The voltage sag is one of most hot topics in dynamic electric energy problems. Masses of new power and electron facilities have been put into use widely, requiring a high quality of electric network and power, chiefly the voltage sag. Moreover, the voltage sag can spread in the electric network. So people have every reason to research and control the voltage sag. However, before developing the voltage sag, people have to detect it. On account of the above, this essay will chiefly focus on the detect methods of the voltage sags. In this paper, the status of the short duration power quality disturbance based on the different method are researched firstly, and emphasizes the characteristic of the voltage sag under the situation of the three kinds of voltage sag disturbances like the short circuit fault, induction motor start-up and transformer excitation. On the basis of the above, the short duration power quality disturbance detection method based on S transform is chosen. The complex m)

说明：  一段三维重建的MATLAB代码，拿来分享！(Three-dimensional reconstruction of the MATLAB code to be shared!)

在多分辨率图像中检测植被，运行环境最好是MATLAB2009以上版本，内有测试数据(Detected in a multi-resolution image of vegetation)

In an image edge is more important to interpolate the missing pixel values. In similarity algorithm edge is detected using the unified high frequency map. Based on this the missing green pixels are interpolated by taking the average of surrounding values. Then the missing red and blue values are interpolated similarly.

Blahut-Arimoto algorithm in Matlab 用Blahut-Arimoto算法计算BEC/BSC信道容量 通信/信息论基础(Blahut-Arimoto algorithm in Matlab)

基于Matlab进行傅里叶变换的算法及程序代码(Matlab-based Fourier transform algorithms and program code)

DBSCAN算法是一种基于密度的算法，进行DBSCAN聚类(simple DBSCAN clustering algorithm，which is based on density.)

此程序在matlab环境下运行，适于求解线性规划一类问题。（单纯形法）(This program runs under matlab environment, suitable to solve a class of linear programming problems. (Simplex method))

透视变换的程序，一个很好的透视变换程序，希望大家下载(Perspective transformation process, a very good perspective transformation process, I hope you download)

一个关于SDP法求最优值的matlab程序，写的很有条理，注释很清晰，稍加修改就能使用。(An SDP method seeking the optimal value of matlab program, written in very organized, very clear comment slightly modified to be able to use.)