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1 College of Computer and Communication Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China 2 College of Computer and Communication Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China 3 Department of Control Engineering, Naval Aeronautical and Astronautical University, Yantai Shandong 264001, China 4 Department of Armament Engineering, Naval Aeronautical and Astronautical University, Yantai Shandong 264001, China a shangzl@zzuli.edu.cn, b cjcheng@zzuli.edu.cn, c leijunwei@126.com, d richkey1980@gmail.com,

Research on Two Kinds of Adaptive Synchronization Method for Uncertain Fourth Order Chaotic Systems based on Sigmoid Function and Soft Function Method