介绍了BP网络的基本结构模型与常见改进算法，在此基础上提出了一种新型的结构自组织BP网络算法。
Based on expatiated the basic structure model and some general improved algorithms of BP neural network, this paper brings forward a new self-organization learning algorithm.
本文提出了确定GM(1,1)模型基本解有关待定参数的一种新方法——图解法。
All parameters in the basic solution form of GM (1, 1) can be determined with this method.
分析了当今虚拟现实技术对开发机械产品的影响，提出了利用VRML构建齿轮变速箱虚拟模型的基本方法。
The influence of virtual reality technology on mechanical product development is analyzed and a method to design virtual model of gear-box based on VRML is presented.
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