1. Graduate School of EngineeringMaebashi Institute of Technology, 460‐1, Kamisadori‐machi Maebashi Gunma 371‐0816 Japan
2. Faculty of EngineeringMaebashi Institute of Technology, 460‐1, Kamisadori‐machi Maebashi Gunma 371‐0816 Japan
3. Textile Research Institute of Gunma Kiryu 379‐2147 Japan