5Maulik U,Bandyopadhyay S. Performance evaluation of some clustering algorithms and validity indices [ J ]. 1EEE Transaction on Pattern Analysis and Machine Intelligence ,2002 ,.24 (12) : 1650 - 1654.
6Campello R J G B, Hruschka E R. A fuzzy extension of the silhouette width criterion for duster analysis [ J ]. Fuzzy Sets and Systems ,2006,157(21 ) :2558 - 2875.
7Camci F,Chinnam R B. Health -state estimation and prognostics in machining processes [ J ]. IEEE Transaction. on Automation Science and Engineering,2010,7 (3) :581 - 597.
8Gebraeel N, Elwany A, Pan J. Residual life predictions in the absence of prior degraduation knowledge[ J]. IEEE Transaction. on Reliability,2009,58 ( 1 ) : 106 - 117.