Rei-Heng Cheng, Chang Wu Yu+ and Tung-Kuang Wu++
Department of Information Management
Hsuan Chuang University
Hsinchu, 300 Taiwan
E-mail: rhc@hcu.edu.tw
+Department of Computer Science and Information Engineering
Chung Hua University
Hsinchu, 300 Taiwan
E-mail: cwyu@chu.edu.tw
++Department of Information Management
Ming Hsin University of Science and Technology
Hsinchu, 304 Taiwan
E-mail: tkwu@mis.must.edu.tw