gray-prediction

带有现象对象界面的matlab的滤波器设计，能对信号进行各种滤波(Object interface matlab with the phenomenon of the filter design, can signal a variety of filtering)

弹簧设计GUI,通过输入要求得到弹簧的结构(Spring Design GUI)

simulink仿真教程，对初学者很有用(the simulink simulation tutorial, very useful for beginners)

天线建模和matlab仿真 (Antenna modeling and simulation matlab)

说明：  GPOPS轨迹优化的模板，内附有说明，适用于各种轨迹优化情况(GPOPS trajectory optimization template with instructions)

说明：  matlab 教程 很有用的啊(matlab tutorial useful ah)

This paper presents a novel algorithm of hiding secret messages by applying mathematical lemmas and information theory. The proposed algorithm can hide more information with acceptable embedded rate and achieves requirements of information hiding algorithm and simply information extracting. The main idea is applying modern algebra to solve the information hiding problem in multimedia. In order to prevent some attacks on stganography, hidden initial bits of image data pixels are chosen randomly. The extracted information are achieved without the reference of the original image and extracted keys. The experiment results show that our approach is effective and reliable.

说明：  Retrieves 3D angles theta_x, theta_y, theta_z, from 3D rotation matrix RxRyRz.

ofdm在高斯白噪声中的传输和衰减以及ofdm导频的添加(ofdm transmission and pilot add white Gaussian noise)

1st FIR filter is given and wee need to find 2nd FIR filter that meet magnitude complementary criterion. fminsearch is used for error minimization.