为了提高二值图像的压缩比，采用自顶向下的编码方法，提出一种基于等腰直角三角形的分形图像压缩算法，并进行仿真实验。
In order to improve the ratio of binary image compression, using top-dowm method of coding, bring forward a fractal image compression method based on isosceles right triangle, and simulated.
针对各类对象，分别讨论了基于稳定域最优PID控制器的设计及进一步改进，并进行了大量仿真实验。
The design methods and further improvement of optimal PID controller for these plants are investigated respectively and a lot of simulation experiments are performed.
再次，在对轮胎花纹噪声研究的基础上，探讨了道路噪声的发声机理、 发声模型及其仿真模型，并进行了仿真实验分析。
Thirdly, the paper has discussed the generation mechanism, acoustic model and the simulation model of the road noise on the basis of the tire pattern noise, and carried out the simulation analysis.
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