中文说明：1.BP神经网络进行模式识别2.用BP网络对非线性系统进行辨识3.一个神经网络PID控制器4.图像处理的PCA算法5.图像处理的穷举算法
English Description：
1. Pattern recognition by BP neural network 2. Nonlinear system identification by BP neural network 3. A neural network PID controller 4. PCA algorithm of image processing 5. Exhaustive algorithm of image processing