CHRISTINE DEWI1, RUNG-CHING CHEN2,+, HUI YU3 AND XIAOYI JIANG4
1Department of Information Technology
Satya Wacana Christian University
Salatiga 50517, Indonesia
2Department of Information Management
Chaoyang University of Technology
Taichung City, 413310 Taiwan
3School of Creative Technologies
University of Portsmouth, PO1 2UP UK
4Department of Mathematics and Computer Science
University of Münster
D-48149 Münster, Germany
E-mail: crching@cyut.edu.tw