College of Automation, Guangdong University of Technology, Guangzhou 510090, China;
Department of Applied Physics, South China University of Technology, Guangzhou 510640, China;
College of Electronic & Information Engineering, South China University of Technology, Guangzhou 510640, China;
Department of Applied Mathematics, Guangdong University of Technology, Guangzhou 510090, China;
Department of Applied Physics, Guangdong University of Technology, Guangzhou 510090, China;
fourth-order systems; N-scroll chaotic attractors; N-scroll hyperchaotic attractors; Nscroll system synchronization;