1. a Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, R.O.C.; Research Center for Biomedical Devices, Taipei Medical University, Taipei 11031, Taiwan, R.O.C.
2. b Department of Electronic Engineering, Southern Taiwan University, Tainan 710, Taiwan, R.O.C.
3. c Department of Electronic Engineering, Southern Taiwan University, Tainan 710, Taiwan, R.O.C.
4. d Department of Electronic Engineering, Cheng Shiu University, Kaohsiung County 833, Taiwan, R.O.C.
5. e Department of Electronic Engineering, Cheng Shiu University, Kaohsiung County 833, Taiwan, R.O.C.