Affiliation: | 1. Graduate School of Engineering Osaka University, Osaka 565‐0871, Japan;2. Research Institute of Nuclear Engineering University of Fukui, Fukui 914‐0055, Japan;3. Center for Exploratory Research Research and Development Group Hitachi, Ltd., Tokyo 185‐8601, Japan;4. JST, PRESTO, Saitama 332‐0012, Japan |