Research interests
Operator Semigroups Theory, Control
Theory of Distributed Parameter Systems, Qualitative Properties of Evolution
Equations (Stability, Stabilizability, Controllability, Passivity, Optimal
Control), Time-Delay Systems
Publications and Preprints
Journal Papers: Refereed
- S. Hadd and Q-C. Zhong, On feedback stabilizability of linear systems
with state and input delays in Banach spaces, IEEE Transaction Automatic
Control, Accepted.
- S. Hadd,
Singular functional differential equations of neutral type in Banach spaces,
Journal of Functional Analysis, 254 (2008) 2069-2091.
- S. Hadd, A. Rhandi and R. Schnaubelt,
Feedback theory for time-varying
regular linear systems with input and state delays, IMA Journal of
Mathematical Control and Information, 25 (2008), 85-110.
- S. Hadd and A. Rhandi,
Feedback theory for neutral equations in
infinite dimensional state spaces, Note di Mathematica, 2007, in press.
- A. El-Harfi, H. Bounit and S. Hadd,
Representation of
infinite-dimensional neutral non-autonomous control systems,
Journal of Mathematical Analysis
and Applications, 323 (2006), 497-512.
- S. Hadd,
An evolution equation
approach to nonautonomous linear systems with state, input
and output delays, SIAM
Journal of Control and Optimization, 45 (2006), 246-272.
- H. Bounit and S. Hadd,
Regular linear systems
governed by neutral FDEs. Journal of Mathematical Analysis
and Applications, 320 (2006), 836-858.
- S. Hadd, A. Idrissi and A. Rhandi.
The regular linear systems
associated to the shift semigroups and application to
control delay systems, Math. Control Signals
Systems, 18 (2006), 272-291.
- S. Hadd and A. Idrissi.
On the
admissibility of observation for perturbed C0-semigroups on
Banach spaces, Systems and Control Letters, 55 (2006),
1-7.
- S. Hadd,
Exact controllability of
infinite dimensional systems persists under small
perturbations. Journal
of Evolution Equations,5 (2005), 545-555.
- S. Hadd and A. Idrissi, Regular linear systems
governed by systems with state, input and output delays. IMA Journal of Mathematical Control and
Information, 22 (2005), 423-439.
- S. Hadd, Unbounded perturbations of
C0-semigroups on Banach spaces and Applications. Semigroup Forum, 70
(2005), 451-465.
- S. Boulite, S. Hadd and L. Maniar, Critical spectrum and
stability for population equation with diffusion in
unbounded domains. Disc. Conti. Dyn. Sys. B, 5 (2005),
265-276.
Papers (in refereed proceeding)
- S .Hadd and Q-C. Zhong,
Conditions on feedback stabilization of systems
with state and input delays in Banach spaces, "Proceeding 46th IEEE Conference on Decision and Control", New Orleans, LA, USA, Dec. 12-14,
2007.
S. Hadd and Q.-C. Zhong, Passivity of infinite dimensional linear systems with state,
input and output delays. In: eds. Proceedings of the 17th IFACWorld Congress.the 17th
IFAC World Congress, The Convention and Exhibition Center. Seoul, Korea: Elsevier
2008, pp. to appear.
Journal Papers : Preprint
- S. Hadd and Q-C. Zhong, Feedback stabilizability of functional partial differential systems
of neutral type in infinite dimensional spaces, Preprint.
- S. Hadd and B. Brogliato, Passivity–based control of complementarity mechanical systems
with flexibilities, Preprint.
Thesis in Mathematics
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