1. Chengdu University of Technology CDUT,Computer Science, School of Information Science and Technology,Chengdu,China,610095
2. Beijing University of Technology, BJUT,Software engineering, School of Information Science,Beijing,China,100020
3. North China Electric Power University,School of Control and Computer Engineering,Baoding,China,071003
4. Beijing University of Technology, BDIC,Software engineering,Beijing,China,100124