作者单位: | School of Mathematics,Beijing Institute of Technology;Pedagogical Department E.E.,Section of Mathematics and Informatics,National and Capodistrian University of Athens,4,Agamemnonos Str.,Aghia Paraskevi,Athens 15342,Greece;School of Communication and Information Engineering,University of Electronic Science and Technology of China;Department of Electrical and Computer Engineering,College of Engineering,University of Kentucky,Lexington 40506,USA |