School of Software, Shandong University, Jinan, China

Email:weileyi@sdu.edu.cn

Personal website:http://lab.malab.cn/~wly

University of Tsukuba, Department of Computer Science, Japan

1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan

Email:wei.lesong.ww@alumni.tsukuba.ac.jp