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无线传感器网的leach协议的实现。基于matlab。。(Wireless sensor networks leach protocol implementation. Based on matlab. .)

基于认知系统中频谱特征的 动态频谱分配与接入机制、资源优化方法研究 (Dynamic spectrum allocation and access mechanism based on the spectral characteristics of the cognitive system, resource optimization methods)

说明：  用matalab实现共轭梯度法求函数最小值(With matable realize conjugate gradient method for the minimum function)

Load flow using Jacobian matrix

仿Matlab的矩阵运算程序，效果和Matlab的一样(Imitation of Matlab matrix calculation procedures)

平面梁单元算例，比较通用的程序，用来平时计算比较方便(plane beam for computing)

信号DOA的估计算法,学习空间谱估计的同学可以参考(the signal DOA estimation algorithm, learning spatial spectrum estimation can refer students)

mage compression is one of the most important step in image transmission and storage. Most of the state-of-art image compression techniques are spatial based. In this code, a histogram based image compression technique is implemented based on multi-level image thresholding. The gray scale of the image is divided into crisp group of probabilistic partition

A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special case.Polyalphabetic substitution ciphers are useful because the are less easily broken by frequency analysis, however if an attacker knows for instance that the message has a period n, then he simply can individually frequency analyze each cipher alphabet. The number of letters encrypted before a polyalphabetic substitution cipher returns to its first cipher alphabet is called its period. The larger the period, the stronger the cipher. Of course, this method of encryption is certainly not secure by any definition and should not be applied to any real-life scenarios.

说明：  对序列进行重构后，计算对应的矩阵，针对不同的嵌入参数，得到不同的图形(Reconstruction of the sequence, the calculation of the corresponding matrix, for different embedding parameters, get a different graphics)