program

说明：  结构振动反应。在强烈地震波德作用下，2个自由度相对位移和绝对加速度的反应，考虑了阻尼的影响。(struture response due to ground motion.during a big ground motion,one 2 degree of freedom-structure s relative displacement and absolute acceleration response.consider damping raion.)

众所周知，欧拉角和四元数是存在对应关系的。后者用于导航等时不存在死区现象，而且，精度高，计算简单。(known, the Euler angles and quaternion is a correlation between them. Navigation for the latter did not exist at the Dead phenomenon, and with high accuracy, is simple.)

about matlab programs

A peak fitting program for time-series signals

说明：  通过Matlab编程，给定初始条件及PML边界条件，模拟VTI介质中地震波传播的波场快照。(The initial conditions and PML boundary conditions are given by programming with matlab.A snapshot of seismic wave propagation in VTI media is simulated.)

scalar costa watermarking

基于SimMechanics的刚体系统建模gears的案例(SimMechanics modeling)

C-C算法，关联积分法求嵌入维数和时间延迟。(CC algorithm, correlation integral method the embedding dimension and time delay.)

This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. (This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. )

说明：  基于振动信号的滚动轴承故障诊断的方法研究.nh(Based on the vibration signals of rolling bearing fault diagnosis method. Nh)