“…As is known, the dynamic characteristics of a system are related to the locations of their eigenvalues; one of the most important methods for the RAVC design is to assign all the eigenvalues of uncertain systems in a specified region so as to achieve the desired characteristics. Some techniques for eigenvalue assignment, such as Lyapunov approach, linear matrix inequality (LMI) design, Hankel matrix measure, and so on, have been presented (Juang, Hong, and Wang, 1989;Wang and Lin, 1992;Wang and Mau, 1995;Wiesel, 1995;Chilali and Gahinet, 1996). One drawback of these control strategies is that they are numerically very difficult to be realized, and sometimes the control loop should be redesigned thoroughly to meet the robustness requirement.…”