1. School of Computer Science and Engineering, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR 999078, China
2. Hitachi Building Technology (Guangzhou) Co., Ltd., No. 2 Nanxiang 3rd Road, Guangzhou 510613, China
3. Institute of Systems Engineering, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR 999078, China