Pei-Yeh Wu, Jen-Jee Chen, Yu-Chee Tseng and Hung-Wei Lee
1Department of Computer Science
National Chiao Tung University
Hsinchu, 300 Taiwan
E-mails: {phwu; chencz; yctseng}@csie.nctu.edu.tw
2Department of Information and Computer Engineering
Chung Yuan Christian University Chungli, 320 Taiwan
3ZyXEL Communications Corp.
Hsinchu, 300 Taiwan
E-mail: hewitt.lee@zyxel.com.tw