Affiliation: | (1) Department of Computer Science, City University of Hong Kong, Hong Kong;(2) Department of Computing, The Hong Kong Polytechnic University, Hong Kong;(3) Department of Computer Science, University of Alberta, Edmonton, Alberta, T6G 2H1, Canada;(4) Sun Microsystems, 901 San Antonio Road, Palo Alto, CA, 94303, U.S.A |