1. Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K.
2. Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu, Taiwan
3. Department of Engineering and System Science and the Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu, Taiwan
4. Institute of Electronics Engineering, National Tsing Hua University, Hsinchu, Taiwan