In order to predict the changing trends of the reservoir water quality,based on the real-measuring data of water quality and the principle of helix cellular automata to organize the sampled data,a BP neural network prediction model was proposed,and an open and flexible prediction system based on virtual instrument was developed.This system was developed by using LabVIEW and C++,the test results show that the model is accurate,simple to use,and it is strongly feasible and practical,it can be adapted for different users and environments.

A kind of intelligent signal generator based on direct digital synthesizer technology is proposed in my paper. MCU AT89C51 is adopted to control DDS chip AD9850 to produce the sine signal which frequency may be adjusted. The pure signal can be obtained through the low pass filter,and then target signal is drove by the power amplifier. The signal generator was applied to measure instrument of deformation of power transformer windings for generating the sine signal which frequency during 1KHZ-1MHZ is able to be adjusted automatically. This generator,has such advantages as high frequency precision,wide frequency range,and quickly facilitate and so on.