Affiliation: | (1) Department of Computer Science, Yunnan University, 650091 Kunming, P. R. China;(2) The Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, The Chinese Academy of Sciences, 10080 Beijing, P.R. China;(3) Department of Metallurgy, Kunming University of Science and Technology, 650093 Kunming, P.R. China |