liziqun

说明：  MATLAB中的符号运算，可以帮助你了解符号的具体算法(GOOD)

5th exercise of computer graphics course

说明：  1.1 背包问题 有一个徒步旅行者，已知他能承受的旅行背包的重量不超过a（kg）。设有n种物品可供他选择装入背包，这n种物品分别编号为1，2，…，n。其中第i种物品每件的重量为ai（kg），其使用价值（指一件第i种物品对旅行者来说所带来的好处的一种数量指标）为ci（i＝1，2，…，n）。问这位旅行者应如何选择携带这n种物品的件数，使得总价值最大？ (1.1 knapsack problem is a hikers. he is known to travel to withstand the weight of the backpack not exceed a (kg). N Species with articles for his choice loaded backpack, n product were numbered 1, 2, ..., n. I first of which product each ai of the weight (kg), its value (i refers to a section of the types of items travelers the benefits brought by a number of indicators) for the ci (i = 1, 2, ..., n). Asked how travelers who choose to bring this product to the n pieces, making the total value of the largest?)

说明：  在扩频系统中再如不同得衰落的情况进行仿真(in spread spectrum systems in different Another example of the decline of Simulation)

这是本人自己遍的matlab程序，即对做过fft变换的相位嵌入水印的程序(this is my own times of Matlab procedures, that is done on the phase transformation fft watermark embedding procedures)

改进人工神经网络法的改进人工神经网络法的短期负荷预测短期负荷预测(Improved artificial neural network of short-term load forecasting )

matlab经典时频分析工具箱，短时傅立叶变换（STFT），维格纳分布（WVD）,伪维格纳分布（PWVD）等时频分析方法(Toolbox short-time Fourier transform (STFT) Wigner distribution (WVD) pseudo-Wigner distribution (PWVD) frequency analysis method matlab classic time-frequency analysis)

用matlab编写的简单程序，用自适应门限法将图像二值化，门限是通过最大类间方差确定(Simple program using matlab, using adaptive threshold method image binarization threshold is determined by Otsu)

dfig的建模，有些参数还未设定调试，可以自己调试(dfig the modeling, some parameters have not yet set the debug)

说明：  首先对电网节点优化，再PQ分解法求解系统潮流。(First of all, optimization of the power grid nodes, then PQ decomposition method for calculating the trend.)