Methods According to the mapping relation between the incidence rate of the noise deafness and their factors, the model of BP neural network was established to forecast the incidence rate of deafness induced by instable state noise.
Results The model of BP neural network for forecasting the incidence rate of deafness induced by instable state noise would be composed of two input units and one output unit and 9 implicit units. The relative error and the average error of the forecasting values appeared to be less than that of the traditional forecasting model. The effect is greatly satisfying.
The present experimental study was to investigate the damaging effect of non steady state noise on animal behavior and free cardiac radical. Subjects(rats)in three experimental groups were exposed to non steady noise produced by multi functional wood craft machines and electric impact drills for 5,10 and 20 days respectively.