Yunfeng Ji

address:	University of Hamburg   Faculty of Mathematics, Informatics and Natural Science   Department Informatics, Group TAMS   Vogt-Kölln-Str. 30   D-22527 Hamburg
position:	PhD student
room:	F-427
fax:	+49 (0) 40 42883-2397
e-mail:	ji@informatik.uni-hamburg.de