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- Said Hadd, Abdelali Idrissi
- IMA J. Math. Control & Information
- 2005

- Said Hadd, Abdelali Idrissi, Abdelaziz Rhandi
- MCSS
- 2006

- Said Hadd, Abdelaziz Rhandi, Roland Schnaubelt
- IMA J. Math. Control & Information
- 2008

We show that the class of regular time varying systems is invariant under perturbations by time–varying state and input delays. In particular, we give explicit formulas of the resulting input, output, and input–output maps. This result is used to solve the feedback problem for the delayed system. The relationship between the open and the closed loop system… (More)

- Said Hadd, Abdelali Idrissi
- Systems & Control Letters
- 2006

- Said Hadd
- SIAM J. Control and Optimization
- 2006

- Said Hadd, Qing-Chang Zhong
- IEEE Trans. Automat. Contr.
- 2009

The feedback stabilizability of a general class of wellposed linear systems with state and input delays in Banach spaces is studied in this paper. Using the properties of infinite dimensional linear systems, a necessary condition for the feedback stabilizability of delay systems is presented, which extends the wellknown results for finite dimensional… (More)

- S Hadd, Q.-C Zhong
- 2008

The feedback stabilizability is an interesting and difficult subject in systems theory. In the finite-dimensional context, the problem of stabilizability is well-established using the so-called Hautus criterion, see e.g. [3]. In the infinite-dimensional context, this problem is quite difficult and only partial answers are obtained under extra assumptions on… (More)

- Said Hadd, Qing-Chang Zhong
- CDC
- 2008

A semigroup approach for the well-posedness of perturbed nonhomogeneous abstract boundary value problems is developed in this paper. This allows us to introduce a useful variation of constant formula for the solutions. Drawing from this formula, necessary and sufficient conditions for the approximate controllability of such systems are obtained, using the… (More)

- S. Boulite, S. Hadd, H. Nounou, M. Nounou
- 2009

The PI controller for plants with unbounded control and observation operators is discussed. This is a generalization of pervious work considering bounded control operators. Our approach is mainly based on regular linear systems in the Salamon–Weiss sense.

- Said Hadd, Hazem N. Nounou, Mohamed N. Nounou
- CDC
- 2010