Affiliation: | a State Key Laboratory of Software Development Environment, LMIB of the Ministry of Education, School of Mathematics and System Sciences, Beihang University, Beijing 100191, PR China b Department of Mathematics, National Cheng Kung University, Taiwan c Department of Management Science, School of Management, Fudan University, Shanghai 200433, PR China d Department of Systems Engineering and Engineering Management, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong |