Address for Xiang-Yang Li Dr. Xiang-Yang Li Sturt Building, 229C Department of Computer Science Illinois Institute of Technology. 10, West 31st Street. Chicago, IL, 60616. Tel:(312) 567-5207 Fax:(312) 567-5067 URLS: http://www.cs.iit.edu/~xli http://www.cs.iit.edu/~winet Emails: xli AT cs DOT iit DOT edu lixian AT iit DOT edu