1. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
2. Intel Corporation, Logic Technology Development, 5200 NE Elam Young Parkway, Hillsboro, Oregon 97124, USA
3. Department of Electrical, Electronic and Computer Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan