98-A17:

    Title: Stability radius of linear delay systems
    Author: Nguyen Khoa Son and Pham Huu Anh Ngoc
    Abstract: In this paper we study robust stability of  linear time delay systems under structured parameter uncertainty. A formula for complex stability radius is derived. We then consider linear positive delay systems and prove that for this class of systems the complex stability radius is equal to the real stability radius which can be computed via a simple formula. Some illustrative examples are given.