School of Mathematics and System Sciences, Shandong University, Jinan 250100;
College of Information and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266510;
School of Mathematics and System Sciences, Shandong University, Jinan 250100;
Singular time-delay systems; functional observer; reduced-order observer; full-orderobserver; linear matrix inequality(LMI);