1. Grad. School of Sci. & Technol., Kwansei Gakuin University,Sanda,Hyogo,Japan
2. School of Eng., Kwansei Gakuin University,Sanda,Hyogo,Japan
3. College of Sci. & Eng., Ritsumeikan University,Kusatsu,Shiga,Japan
4. ASTEM RI Kyoto,Res. & Development Div.,Kyoto,Japan