3Wu H H,liao A Y,Wang P C.Using grey theory in quality function de- ployment to analyze dynamic customer requirements[J].Int J Adv Manuf Technol,2005,25:1 241 - 1 247.
4Zhang C Y,Dai W Z.Improvement of background value and its appli- cation in the 7th Word Congress on Intelligent Control and Automa- tion[Z].2008.
5Cui Lizhi,Liu Sifeng,Wu Zhengpeng.Optimizing iime respond func- tion of non-equidistant GM(1,1)mode[J].Statistics and Decision Mak- ing,2009,(13):9-10.