Field of expertise
Applied Mathematics (Control Theory), Pure Mathematics (Functional Analysis of operator semigroups)
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, Approximate controllability of perturbed boundary control problems and its application to neutral differential systems with state and input delays, .
- S. Hadd and Q.-C. Zhong, On feedback stabilizability of linear systems
with state and input delays in Banach spaces,, IEEE Transaction Automatic
Control, vol. 54, n.3, (2009), 438-451.
- 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, 28 (2008) n. 1, 43-68
- 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 IFAC World Congress. Seoul,
Korea, pp.4198-4203, 2008.
- S. Hadd and Q.-C. Zhong, Perturbation theory of boundary
value problems and approximate controllability of perturbed boundary
control problems. In: eds. Proc. of the 47th IEEE Conference on Decision
and Control. Cancun,
Mexico, pp. 1465-1470, 2008.
- S. Hadd and Q.-C. Zhong (2008) Necessary and sufficient conditions for
feedback stabilizability of time–delay systems in Banach spaces. In: In Proc. of the 18th Int. Symposium on Mathematical Theory of Networks and Systems (MTNS2008), Virginia, USA, July 2008.
Thesis in Mathematics
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