1. Department of Electronics and Computer Science, Graduate School of Engineering, University of Hyogo, Himeji, Hyogo 671-2201, Japan
2. Synchrotron X-ray Group, Research Center for Advanced Measurement and Characterization, National Institute of Materials Science (NIMS), Sayo, Hyogo 679-5198, Japan
3. Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Yokohama 226-8502, Japan
4. Japan Synchrotron Radiation Research Institute (JASRI)/Sayo, Hyogo 679-5198, Japan