aided_ins_15_state

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.

OS-EM迭代算法 用于图像重建，是一种新的图像重建方法，可以有效减少伪影(OS-EM iterative algorithm for image reconstruction, is a new image reconstruction method can effectively reduce the artifacts)

关于相参积累和非相参积累的MATLAB仿真(Coherent integration and noncoherent Simulation)

从多层树中取得偶数生成列，取得动态目标值的个数，从两个不同的树中，提取第二个树中独有的元素（和第一个树的元素不同的元素），并计算其和。(Generated columns to obtain an even number, the target value obtained from the dynamic multi-tree, from two different tree, extracts a second element that is unique in the tree (a tree of elements and different elements), and and calculate its.)

控制系统计算机辅助设计——MATLAB语言及应用 主要的一些源程序(control system for matlab)

MATLAB实用程序100例子仿真,同学们可以先看看，希望有所帮助( MATLAB emluator100 of example)

Histogram equalization...Image processing

物质点法的MATLAB计算程序 这是本构模型课上的作业(MATLAB calculation program material point method which is the job of the constitutive model lesson on)

Ky Buck Boost Converter Closed Loop

小波变换，小波去噪，小波滤波新方法（软阈值）(Wavelet transform, wavelet denoising, wavelet filtering new methods (soft threshold))