E-mail: xuxian@sjtu.edu.cn; xuxian2004@gmail.com, Xian Xu is a Ph.D. candidate in BASICS Lab, Department of Computer Science and Engineering, Shanghai Jiao Tong University (SJTU). Currently he is affiliated with Department of Computer Science and Engineering, East China University of Science and Technology. He obtained the B.S. degree in computer science from SJTU in 2002, and obtained his M.S. degree in computer science in DCTC (Distributed Computing Technology Center) from SJTU in 2005. His current research interests include concurrency, especially process calculi, such as their semantics, bisimulation theory, axiomatization, expressive power and etc. He also takes interest in the application of concurrency models to systems biology and (security) protocol analysis and verification, and has got some publications.