是学习PCA特征提取的很好的学习资料，主要为数据分析和统计，采用热核构造权重，关于神经网络控制，到达过程是的泊松过程，使用大量的有限元法求解偏微分方程。- Is a good learning materials to learn PCA feature extraction, Mainly for data analysis and statistics, Thermonuclear using weighting factors On neural network control, Arrival process is a Poisson process, Using a large number of finite element method to solve partial differential equations.