1.simulation

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.

this is some codes in systems

Android Battery Dog手機電量監控介面原始碼(Cell phone battery monitoring interface)

这个是基于Rosin论文编写的一个Rosin算法，(This is based on a written paper Rosin Rosin algorithm)

ti-nspire mod for ndless

一些通信系统的仿真程序，包括简单的CDMA、FDMA和TDMA系统(Some communication system simulation program, including a simple CDMA, FDMA and TDMA systems)

三相交流故障模型 用matlab搭建的一个系统 十分实用 可直接用于故障测距(A three-phase AC system fault model built with very practical matlab can be directly used for fault location)

PV WITH THREE PHASE INVERTER

A Matlab Code for Genetic Algorith

利用fisher方法实现手写体数字多分类识别，采用mnist数据集(simple program using fisher)