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and academic activity when a sophomore, i joined the association of ai enthusiast and began to narrow down my interest for my future research. in 1997, i participated in simulation tool development for the scheduling system in prof. wang’s lab. with the tool of opengl and matlab, i designed a simulation program for transportation scheduling system. it is now widely used by different research groups in nust. in 1998, i assumed and fulfilled a sewage analysis dispose project for nanjing sewage treatment plant. this was my first practice to convert a laboratory idea to a mercial product. in 1999, i joined the distinguished professor yugeng xis research group aiming at network flow probl