Prime Senior Researcher in Research Institute for Ubiquitous Energy Devices (UBIQEN), National Institute of Industrial Science and Technology (AIST), Osaka, Japan. PhD from Department of Materials Science, the University of Tokyo in 1992. Researcher in Osaka National Research Institute till 1999. From 2000, Group Leader and Prime Senior Researcher in AIST. I am engaged in computational materials science researches using density-functional theory and tight-binding models about grain boundaries, interfaces and defects in various materials for energy and environment devices.