本文将神经网络与时间序列方法相结合,建立肺癌发病率的RBF神经网络时间序列组合预测模型。

To observe the effects of endothelial secretive function in rats fed with high methionine diets,male wistar rats are randomly divided into the normal diet group(CR)and high methionine diet group(MR).After 8 weeks,plasma homocysteine level,bodyweight and equal daily diet were measured,the endothelium ultrastructure changes in aorta wall were observed with scanning electron microscope.The results syowed that the rat's endothelial cells of blood vessel of group CR were relatively unanimous in size,arrange closely along the axis of ordinates of blood vessel.The ones of group MR were damaged obviously,the cell surface shrinks.Endothelium to be damaging by worms kinds of harming typical,with enclose wall thrombus form and with the fat quality depositing.Plasma homocysteine level of MR increased twofold as compared with that of CR(P0.05).It concluded rats fed with himethionine diet could be led to hyperhomocysteinemia,and a serious early change of endothelium.