1. Power Electronics Branch, U.S. Naval Research Laboratory, Washington, DC 20375, USA
2. Electronic Materials Branch, U.S. Naval Research Laboratory, Washington, DC 20375, USA
3. American Society for Engineering Education, Washington, DC 20036, USA
4. Novel Crystal Technology, Sayama-City, Saitama 350-1328, Japan
5. Tamura Corporation, Sayama-City, Saitama 350-1328, Japan