Prof. Gengsheng Wang received his Ph.D. in Mathematics from Ohio University (Athens, USA) in 1994. He is currently Luojia Professor at the School of Mathematics and Statistics, and Director of the Institute of Mathematics, at Wuhan University, China. His research work mainly focus on optimal control problems, (in particular, time optimal control problems), controllability and stabilization for ordinary differential equations, and partial differential equations of parabolic type. Dr. Yashan Xu received his Ph.D. in Mathematics from Fudan University (Shanghai, China) in 2006. He is currently an Associate Professor at the School of Mathematical Sciences, Fudan University, China. His research interests include differential games, optimal control theory and stabilization for evolution equations.

• 1 Controlled Periodic Equations, LQ Problems and Periodic Stabilization. 2 Criteria on Periodic Stabilization in Infinite Dimensional Cases. 3 Criteria on Periodic Stabilization in Finite Dimensional Cases. 4 Design of Simple Control Machines. Index