1. College of Mathematics and Computer Sciences, Guangxi Science and Technology Normal University,Laibin,China,546199
2. College of Electronic Information and Automation, Guilin University of Aerospace Technology,Guilin,China,541004
3. Fredericton Research and Development Centre, Agriculture and Agri-Food Canada, Fredericton,New Brunswick,Canada,E3B 4Z7
4. School of Computer Science, University of Windsor,Windsor,Ontario,Canada,N9B 3P4