**7. Conclusion**

We considered the design of dynamic output feedback laws via the SOS decomposition. For the design of the feedback laws, we derived the design conditions as the state-dependent matrix inequalities. According to the derived conditions, we can design the stabilizing feedback laws as the feasible solutions to the SDLMIs by using the numerical solvers. Future works include to derive less conservative conditions and to develop design methods of dynamic output feedback laws for advanced control, such as H-infinity control.
