1. School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang, Jiangxi, P.R. China
2. China Railway Conservancy & Hydropower Planning and Design Group Co., Ltd, Nangchang, Jiang'xi, P.R. China
3. School of Artificial Intelligence, OPtics and ElectroNics (iOPEN), School of Computer Science, Northwestern Polytechnical University, Xi'an, P.R. China