Yoshiyasu Ehara received the Ph.D. degree from Musashi Institute of Technology, Tokyo, Japan, in 1996. He is currently a Professor of electrical and electronics engineering with Tokyo City University, Tokyo. From 2002 to 2003, he was a Visiting Academic at the Ford Research Laboratory, Dearborn, MI, USA. His research interests include industrial application of nonthermal plasma and degradation diagnosis technology of the insulation materials in electric power apparatus. Prof. Ehara is a member of the Institute of Electrical Engineers of Japan.