1. Department of Computer-Aided Engineering and Development, Sumitomo Metal Mining Co., Ltd., 3-5, Sobiraki-cho, Niihama, Ehime 792-0001, Japan
2. School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
3. Research Center for Advanced Computing Infrastructure, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan