TY JOUR TI The estimation of fuzzy boundary of multioperational machine tool life KW multioperational machine KW tool state monitoring KW knowledge system KW the management of tool software KW fuzzy boundary resistance JO Vestnik of Don State Technical University AU SHuchyev, K.. AU Terekhov , D.. AU Izyumov, A.. AU Tugengold, A.. PY 2015 IS 15 PB Don state technical University