Institute of Information and System Science, Xi'an Jiaotong University, Xi'an 710049, China;
Department of Bioinformatics, Faculty of Engineering, Soka University, Tokyo, Japan;
Advanced Modeling and Applied Computing Laboratory, Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong, China;
Department of Mathematics, School of Information, Renmin University of China, Beijing 100872, China;
