1. Advanced Manufacturing Center Ningbo Institute of Technology Beihang University Ningbo 315100 P. R. China
2. Department of Clinical Laboratory The Second Hospital of Anhui Medical University Anhui 230601 P. R. China
3. National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang University 37 Xueyuan Road Beijing 100083 P. R. China
4. International Research Institute for Multidisciplinary Science Beihang University 37 Xueyuan Road Beijing 100083 P. R. China
5. Department of Electrical and Computer Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore