1. Department of Science Education, Division of Educational Sciences, Graduate School of Humanities and Social Sciences, Hiroshima University, 1-1-1 Kagamiyama, Higashi-Hiroshima 739-8524, Japan
2. Mines Saint-Etienne, University of Lyon, CNRS, UMR 5307 LGF, Centre SPIN, F-42023 Saint-Etienne, France