Corresponding Address 
| Dr. Chao-Hsien Chu | Tel: +1 (814) 865-4446 |
| School of Information Sciences and Technology | Fax: +1 (814) 865-6426 |
| The Pennsylvania State University | WWW: http://net1.ist.psu.edu/chu/ |
| 301 K IST Building | E-mail: chu@ist.psu.edu |
| University Park, PA 16802, USA/TD> |