1. School of Information Science, JAIST 1 , Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
2. Materials Science and Technology Division, Oak Ridge National Laboratory 2 , Oak Ridge, Tennessee 37831, USA
3. Research Center for Advanced Computing Infrastructure, JAIST 3 , Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan