1. Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing, China
2. Department of Computer Science, Munster Technological University, Cork, Ireland
3. Department of Computer Education, Sungkyunkwan University, Seoul, South Korea
4. Power Grid Digitizing Technology Department, State Grid Smart Grid Research Institute Company Ltd., Nanjing, China