[He, Hongyu] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
[He, Hongyu; Zhang, Shengdong; Lin, Xinnan] Peking Univ, Shenzhen Grad Sch, Sch Elect & Comp Engn, Shenzhen 518005, Peoples R China.
[Liu, Yuan] China Elect Prod Reliabil & Environm Testing Res, Sci & Technol Reliabil Phys & Applicat Elect Comp, Guangzhou 510610, Guangdong, Peoples R China.
[Yan, Binghui] South China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R China.
[Zheng, Xueren] South China Univ Technol, Sch Elect & Informat Engn, Guangzhou 510640, Peoples R China.