Affiliation: | aCentral Research Institute of Electric Power Industry (CRIEPI), Yokosuka 2-6-1, Nagasaka, Yokosuka-shi, Kanagawa-ken 240-0196, Japan bCentral Research Institute of Electric Power Industry (CRIEPI), Komae 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japan |