1. Department of Electronics and Control EngineeringNational Institute of Technology, Niihama College7-1 Yagumo-choNiihamaEhime792-8580Japan
2. Graduate School of Technology, Industrial and Social Sciences, Tokushima University2-1 Minamijosanjima-choTokushima770-8506Japan
3. School of Environment, Science and Engineering, Southern Cross UniversityP.O. Box 157LismoreNSW2480Australia