Node Localization in Wireless Sensor Network by Ant Lion Optimization Thi Kien Dao1, Jeng Shyang Pan1,2,Trong The Nguyen1,3*, Shu Chuan Chu2, Huu Trung Tran3, Trinh Dong Nguyen3, Ngoc Thanh Vu 4 1Fujian Provincial Key Lab of Big Data Mining and Applications Fujian University of Technology, Fujian, China 2College of Computer Science and Engineering, Shandong University of Science and Technology, Qingdao, China 3University of Management and Technology, Haiphong, Vietnam 4University of Medicine and[.]