1. Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and InstrumentBeijing Information Science & Technology UniversityNo. 35 Beisihuan Middle Road, Chaoyang DistrictBeijingPeople's Republic of China
2. School of Electrical and Electronic EngineeringNorth China Electric Power UniversityNo. 2 Beinong Road, Changping DistrictBeijingPeople's Republic of China