John Sum, Jie Wu and Kevin Ho
1Department of Information Management
Chung-Shan Medical University
Taichung, 402 Taiwan
E-mail: pfsum@csmu.edu.tw
2Department of Computer Science and Engineering
Florida Atlantic University
Boca Raton, Florida 33431, U.S.A.
E-mail: jie@cse.fau.edu
3Department of Computer Science and Communication Engineering
Providence University
Taichung, 433 Taiwan
E-mail: ho@pu.edu.tw