1. Department of Aerospace Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
2. Aerospace Plane Research Center, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan
3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 252-5210, Japan
4. NTT Data XAM Technologies, Minoh, Osaka 562-0035, Japan