[1]Division of Mechanical Engineering, Renewable Energy Course, Ashikaga Institute of Technology, Tochigi 326-8558, Japan;
[2]Environment and Energy Department, Japan Weather Association, Higashi-Ikebukuro3-1-1-F55, Tokyo 170-6055, Japan;
[3]Water Resources ＆ Energy Department, Nippon-koei Co., Ltd. 1-14-6Kudan-kita, Chiyoda-ku, Tokyo 102-8539, Japan;
[4]Ashikaga Institute of Technology, Omae-cho 268-1, Ashikaga, Tochigi 326-8558, Japan;
