Institution: | 1. Corporate Research and Development Group, NGK Insulators, Ltd., Suda-cho, Mizuho-ku, Nagoya, 467, Japan 2. Graduate School of Science and Technology, Kobe University, Neda-ku, Kobe, 657, Japan 3. Department of System Science, Kobe University, Neda-ku, Kobe, 657, Japan
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