1. School of Automation, China University of Geosciences, Wuhan 430074, China, and with the Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex Systems, Wuhan 430074, China, and also with the Engineering Research Center of Intelligent Technology for Geo-Exploration, Ministry of Education, Wuhan 430074, China.
2. School of Automation, China University of Geosciences, Wuhan 430074, China, and with the Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex Systems, Wuhan 430074, China, and also with the Engineering Research Center of Intelligent Technology for Geo-Exploration, Ministry of Education, Wuhan 430074, China (e-mail: laixz@cug.edu.cn)