Institution: | (1) Key Laboratory of Opto-Electronic Technology and Intelligent Control (Lanzhou Jiaotong University), Ministry of Education, P.O. Box 73, 118 West Anning Road, Lanzhou Jiaotong University, Lanzhou 730070 Gansu, People s Republic of China;(2) Department of Electronic and Electrical Engineering, University of Bath, Bath, BA2 7AY, UK |