1. Energy and Environment Program, School of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 902-0213, Japan
2. IHI Plant Services Corporation, Toyosu IHI Bldg., 3-1-1 Toyosu, Koto-ku, Tokyo 135-0061, Japan
3. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi,
Kohoku-ku, Yokohama 223-8522, Japan