Dr. Said HADD

Researcher in Mathematics
Department of Electrical Engineering & Electronics
The University of Liverpool
Brownlow Hill Liverpool, L69 3GJ
United Kingdom

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e-mail address:
s.hadd@liv.ac.uk
Office:
314 in the third floor of building B
Phone:
+44 (0) 7791 168598

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

  1. 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.
  2. S. Hadd, Singular functional differential equations of neutral type in Banach spaces, Journal of Functional Analysis, 254 (2008) 2069-2091.
  3. 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.
  4. S. Hadd and A. Rhandi, Feedback theory for neutral equations in infinite dimensional state spaces, Note di Mathematica, 2007, in press.
  5. 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.
  6. 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.
  7. H. Bounit and S. Hadd, Regular linear systems governed by neutral FDEs. Journal of Mathematical Analysis and Applications, 320 (2006), 836-858.
  8. 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.
  9. 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.
  10. S. Hadd, Exact controllability of infinite dimensional systems persists under small perturbations. Journal of Evolution Equations,5 (2005), 545-555.
  11. 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.
  12. S. Hadd, Unbounded perturbations of C0-semigroups on Banach spaces and Applications. Semigroup Forum, 70 (2005), 451-465.
  13. 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)

  1. 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.
  2. 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

  1. S. Hadd and Q-C. Zhong, Feedback stabilizability of functional partial differential systems of neutral type in infinite dimensional spaces, Preprint.
  2. S. Hadd and B. Brogliato, Passivity–based control of complementarity mechanical systems with flexibilities, Preprint.

Thesis in Mathematics


Last Modification: February 2008 © Said Hadd

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