My
Ph.D. thesis was on the matrix nearness problems arising in control
theory. The major problems that I tackled in my thesis were

- some of the measures that are indicators of the transient behavior that a dynamical system may exhibit,
- distance to uncontrollability for linear and higher order dynamical systems.

- E. Mengi. Measures for Robust Stability and Controllability. Ph.D Thesis, New York University, September 2006. (Ph.D. thesis in pdf)