4Ahn B S,Cho S S , Kin C Y. The integrated methodolo-gy rough set theory and artificial neural network for busi-ness failure pre2diction [j] . Expert Systems with Ap-plications ,2000 (1): 65-74.
5J. Farrell, Stability and Approximator Convergence inNeural net for Adaptive Control [j] . IEEE. All NeuralNetworks 9 (1998),no. 5,1008-1020.
6K. Homik, M. Stintchcombe, and H. White. Multilayerfeedforward networks are universal appoximators [J].Neural Networks, 1989 (2): 350-366.