1. Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan
2. Department of Technology Education, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, Japan
3. Department of Chemical and Materials Engineering, University of Alberta, 9211-116 Street NW, Edmonton, Alberta, Canada