1. Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, P. R. China
2. Institute of Precision Instrument and Intelligent Measurement & Control, Fuzhou University, Fuzhou 350108, P. R. China
3. School of Economics and Management, Minjiang University, Fuzhou 350108, P. R. China
4. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shanxi 710049, P. R. China