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    Research Director at CNRS


    Silviu-Iulian NICULESCU was born in Petrosani, Romania in 1968. He received the B.S. degree from the Polytechnical Institute of Bucharest, Romania, the M.Sc., and Ph.D. degrees, both in Automatic Control, from the Institut National Polytechnique de Grenoble, France, and the “Habilitation à Diriger des Recherches” (HDR) in Automatic Control from Université de Technologie de Compiègne, in 1992, 1993, 1996, and 2003, respectively. From 1992 to 1997, he was with the Department of Automatic Control and Computers, University "Politehnica" Bucharest, Romania. From 1997 to 2006, he was with HEUDIASYC (“Heuristics and diagnosis of complex systems”) laboratory, Compiègne, France as a Researcher at CNRS (French National Center for Scientific Research). He also held a PostDoctoral position in the Department of Applied Mathematics, ENSTA, Paris, France, from 1996 to 1997. In September 2006, he joined L2S (Laboratory of Signals and Systems), Gif-sur-Yvette, where he is currently Research Director (“Senior Researcher”) at CNRS and the head of the laboratory. (since 2010).

    He is author or co-author of ten books (Diderot: 1997; Birkhauser, Briefs: 2015; SIAM: 2007 and 2015; Springer: LNCIS - 2001, CES - 2014, AIC - 2015, SpringerBriefs - 2 in 2015  1 in 2016, and 1 in 2018)  and co-editor of six volumes (SIAM, 1999; Pergamon Press, 2001; Springer 2004; Springer 2007; Springer 2009). He is author or co-author of more than 500 book chapters or scientific papers. He has been the IPC Chairman of the 3rd IFAC Workshop on Time-Delay Systems (Santa Fe, NM, USA, December 2001) , of the 8th IFAC Workshop on Time-Delay Systems (Sinaia, Romania, September 2009), 13th European Control Conference (Strasoburg, France, June 2014), and the main organizer or co-organizer of the 1st CNRS-NSF Workshop on Time-Delay Systems (Paris: La Défense, January 2003), and of the two European Summer School in Automatic Control (Grenoble, September 2000; Grenoble, July 2013) devoted to time-delay systems. He was the guest co-editor of five special issues in the area of delay systems (Journal of Mathematical Modelling of Natural Phenomena (MMNP) in 2009, Asian Journal of Control in 2005, IMA Journal of Mathematical Control and Information in 2002 and 2010, and Kybernetika in 2001).

    Dr. Niculescu has been scientific responsible of 15 international cooperation programs and projects (with Belgium, Mexico, Romania and Eastern European countries, South Korea, Hong Kong, Turkey and United States). He is member of the IPC of 45 International Conferences, and he was an Associate Editor of the IEEE Transactions on Automatic Control (2003-2005). Since 2011, he is an Associate Editor of European Journal of Controland IMA Journal of Mathematical Control and InformationIEEE Fellow since 2018, Dr Niculescu is the chair of the IFAC Technical Committee "Control Linear Systems" (TC 2.2) and he was the chair of the IFAC Research Group on "Time-delay systems" (2007 and chair of the IFAC Technical Committee on Control Linear Systems (TC 2.2) since 2017. Since 2012, he is the founding editor and the scientific responsible of the Springer (book) series: Advances in Delays in Dynamics (ADD@S).

    Dr. Niculescu was awarded the CNRS Silver and Bronze Medals for scientific research, the Best Paper Presentation Award at American Control Conference, Chicago, IL and the Ph.D. Thesis Award from INPG, Grenoble (France) in 2011, 2001, 2000, and 1996, respectively. He was also awarded the title of "Doctor Honoris Causa" of University of Craiova (Romania) in 2016. His research interests include delay systems, robust control, operator theory, and numerical methods in optimization, and their applications to the design of engineering systems.


    Islam Boussaada   

    Books1 document

    Journal articles13 documents

    • Chi Jin, Keqin Gu, Islam Boussaada, Silviu-Iulian Niculescu. Stability Analysis of a More General Class of Systems with Delay-Dependent Coefficients. IEEE Transactions on Automatic Control, Institute of Electrical and Electronics Engineers, 2019, 14, pp.1. ⟨hal-01957472⟩
    • Islam Boussaada, Silviu-Iulian Niculescu. On the Dominancy of Multiple Spectral Values for Time-delay Systems with Applications. IFAC-PapersOnLine, Elsevier, 2018, 51 (14), pp.55-60. ⟨hal-01957523⟩
    • Souad Amrane, Fazia Bedouhene, Islam Boussaada, Silviu-Iulian Niculescu. On Qualitative Properties of Low-Degree Quasipolynomials: Further remarks on the spectral abscissa and rightmost-roots assignment. Bull. Math. Soc. Sci. Math. Roumanie Tome, 2018, 61, pp.361 - 381. ⟨hal-01969066⟩
    • Islam Boussaada, Sami Tliba, Silviu-Iulian Niculescu, Hakki Ulaş Unal, Tomáš Vyhlídal. Further remarks on the effect of multiple spectral values on the dynamics of time-delay systems. Application to the control of a mechanical system. Linear Algebra and its Applications, Elsevier, 2018, 542, pp.589-604. ⟨10.1016/j.laa.2017.11.022⟩. ⟨hal-01657659⟩
    • Silviu Iulian Niculescu, Chi Jin, Keqin Gu, Islam Boussaada. Stability Analysis of Systems with Delay-Dependent Coefficients: an Overview. IEEE Access, IEEE, 2018, pp.1. ⟨10.1109/ACCESS.2018.2828871⟩. ⟨hal-01781318⟩
    • Dina Irofti, Keqin Gu, Islam Boussaada, Silviu-Iulian Niculescu. Some insights into the migration of double imaginary roots under small deviation of two parameters. Automatica, Elsevier, 2018, 88, pp.91-97. ⟨10.1016/j.automatica.2017.11.015⟩. ⟨hal-01712829⟩
    • Hakki Ulas Unal, Islam Boussaada, Silviu-Iulian Niculescu. A Delay-Based Sustained Chemical Oscillator: Qualitative Analysis of Oregonator-Based Models. IEEE Life Sciences Letters, 2017, 3 (3), pp.9 - 12. ⟨10.1109/LLS.2017.2756834⟩. ⟨hal-01656725⟩
    • Wim Michiels, Islam Boussaada, Silviu-Iulian Niculescu. An explicit formula for the splitting of multiple eigenvalues for nonlinear eigenvalue problems and connections with the linearization for the delay eigenvalue problem. SIAM Journal on Matrix Analysis and Applications, Society for Industrial and Applied Mathematics, 2017, 38 (2), pp.599-620. ⟨10.1137/16M107774X⟩. ⟨hal-01558169⟩
    • Islam Boussaada, Silviu-Iulian Niculescu, Sami Tliba, Tomáš Vyhlídal. On the Coalescence of Spectral Values and its Effect on the Stability of Time-delay Systems: Application to Active Vibration Control. Procedia IUTAM, cElsevier, 2017, 22, pp.75 - 82. ⟨10.1016/j.piutam.2017.08.011⟩. ⟨hal-01656723⟩
    • Islam Boussaada, Silviu-Iulian Niculescu. Tracking the Algebraic Multiplicity of Crossing Imaginary Roots for Generic Quasipolynomials: A Vandermonde-Based Approach. IEEE Transactions on Automatic Control, Institute of Electrical and Electronics Engineers, 2016, 61 (6), pp.1601-1606. ⟨10.1109/TAC.2015.2480175⟩. ⟨hal-01425757⟩
    • Martha Belem Saldivar, Mondie Sabine, Silviu-Iulian Niculescu, Hugues Mounier, Islam Boussaada. A control oriented guided tour in oilwell drilling vibration modeling. Annual Reviews in Control, Elsevier, 2016, 42, pp.100-113. ⟨10.1016/j.arcontrol.2016.09.002⟩. ⟨hal-01425845⟩
    • Islam Boussaada, Silviu-Iulian Niculescu. Characterizing the Codimension of Zero Singularities for Time-Delay Systems : A Link with Vandermonde and Birkhoff Incidence Matrices. Acta Applicandae Mathematicae, Springer Verlag, 2016, 145 (1), pp.47-88. ⟨10.1007/s10440-016-0050-9⟩. ⟨hal-01429961⟩
    • Islam Boussaada, Irinel-Constantin Morarescu, Silviu-Iulian Niculescu. Inverted pendulum stabilization: Characterization of codimension-three triple zero bifurcation via multiple delayed proportional gains. Systems and Control Letters, Elsevier, 2015, 82, pp.1-9. ⟨10.1016/j.sysconle.2015.03.002⟩. ⟨hal-01162266⟩

    Conference papers24 documents

    • Islam Boussaada, Silviu-Iulian Niculescu, Karim Trabelsi. Towards a Decay Rate Assignment Based Design for Time-Delay Systems with Multiple Spectral Values. MTNS, Jul 2018, Hong Kong, China. ⟨hal-01957555⟩
    • Chi Jin, Islam Boussaada, Silviu-Iulian Niculescu, Keqin Gu. An Overview of Stability Analysis of Systems with Delay Dependent Coefficients. 21st International Conference on System Theory, Control and Computing (ICSTCC 2017), Oct 2017, Sinaia, Romania. ⟨10.1109/icstcc.2017.8107072 ⟩. ⟨hal-01658201⟩
    • Islam Boussaada, Sami Tliba, Silviu-Iulian Niculescu. A Delayed Feedback Controller for Active Vibration Control : A Rightmost-Characteristic Root Assignment based Approach. 21st International Conference on System Theory, Control and Computing (ICSTCC 2017), Oct 2017, Sinaia, Romania. ⟨10.1109/icstcc.2017.8107073 ⟩. ⟨hal-01658209⟩
    • Dina Irofti, Islam Boussaada, Silviu-Iulian Niculescu. Geometric vs. algebraic approach: A study of double imaginary characteristic roots in time-delay systems. IFAC 2017 - 20th World Congress of the International Federation of Automatic Control, Jul 2017, Toulouse, France. pp.1310 - 1315, ⟨10.1016/j.ifacol.2017.08.123⟩. ⟨hal-01815469⟩
    • Chi Jin, Silviu-Ilian Niculescu, Islam Boussaada, Keqin Gu. Stability Analysis of Control Systems subject to Delay-Difference Feedback. IFAC 2017 - 20th World Congress of the International Federation of Automatic Control, Jul 2017, Toulouse, France. pp.13330 - 13335, ⟨10.1016/j.ifacol.2017.08.1894⟩. ⟨hal-01656727⟩
    • Hakki Ulaş Unal, Islam Boussaada, Silviu-Iulian Niculescu. Tracking Sustained Oscillations in Delay Model Oregonators. 2016 IEEE Conference on Control Applications(CCA), Sep 2016, Buenos Aires, Argentina. ⟨10.1109/cca.2016.7587993 ⟩. ⟨hal-01658325⟩
    • Keqin Gu, Chi Jin, Islam Boussaada, Silviu-Iulian Niculescu. Towards more general stability analysis of systems with delay-dependent coefficients. 55th IEEE Conference on Decision and Control (CDC 2016), Dec 2016, Las Vegas, United States. ⟨10.1109/cdc.2016.7798743 ⟩. ⟨hal-01658313⟩
    • Islam Boussaada, Hakki Ulaş Unal, Silviu-Iulian Niculescu. Multiplicity and Stable Varieties of Time-delay Systems : A Missing Link. 22nd International Symposium on Mathematical Theory of Networks and Systems (MTNS), Jul 2016, Minneapolis, United States. ⟨hal-01658365⟩
    • Islam Boussaada, Hakki Ulas Unal, Silviu-Iulian Niculescu. Further remarks on the effect of multiple spectral values on the dynamics of Time-delay systems : A Birkhoff-based approach. the 20th Conference of the International Linear Algebra Society, Jul 2016, Leuven, Belgium. ⟨hal-01658264⟩
    • Unal Hakki, Islam Boussaada, Silviu-Iulian Niculescu. Further remarks on delay dynamics in Oregonator models. IEEE International Conference on Control and Automation, Jun 2016, Kathmandu, Nepal. ⟨10.1109/ICCA.2016.7505261⟩. ⟨hal-01445899⟩
    • Islam Boussaada, Hakki Ulaş Unal, Silviu-Iulian Niculescu. Multiplicity and stable manifolds for time-delay systems : Further remarks on the rightmost root. the 11th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Jul 2016, Orlando, United States. ⟨hal-01658297⟩
    • Dina Irofti, Keqin Gu, Islam Boussaada, Silviu-Iulian Niculescu. Migration of imaginary roots of multiplicity three and four under small deviation of two delays in time-delay systems. 15th European Control Conference (ECC 2016), Jun 2016, Aalborg, Denmark. ⟨10.1109/ecc.2016.7810535 ⟩. ⟨hal-01418212⟩
    • Keqin Gu, Dina Irofti, Islam Boussaada, Silviu-Iulian Niculescu. Migration of double imaginary characteristic roots under small deviation of two delay parameters. 54th IEEE Conference on Decision and Control (CDC), Dec 2015, Osaka, Japan. ⟨10.1109/cdc.2015.7403229 ⟩. ⟨hal-01261215⟩
    • Islam Boussaada, Dina Irofti, Silviu-Iulian Niculescu. Characterizing the multiplicity of spectral values for time-delay systems. Mini-symposium Delay systems and applications, E. Braverman, Aug 2015, Beijing, China. ⟨hal-01284833⟩
    • Islam Boussaada, Dina Irofti, Silviu-Iulian Niculescu. Computing the codimension of the singularity at the origin for delay systems in the regular case: A vandermonde-based approach. European Control Conference (ECC), 2014, Jun 2014, Strasbourg, France. ⟨10.1109/ECC.2014.6862469⟩. ⟨hal-01123598⟩
    • Islam Boussaada, Silviu-Iulian Niculescu. Computing the Codimension of the Singularity at the Origin for Delay Systems: The Missing Link with Birkhoff Incidence Matrices. 21st International Symposium on Mathematical Theory of Networks and Systems July 7-11, 2014. Groningen, The Netherlands, Jul 2014, Groningen, Netherlands. ⟨10.1109/ecc.2014.6862469 ⟩. ⟨hal-01123621⟩
    • Islam Boussaada, Irinel-Constantin Morarescu, Silviu-Iulian Niculescu. Inverted pendulum stabilization via a Pyragas-type controller: revisiting the triple zero singularity. 19th IFAC World Congress on International Federation of Automatic Control (IFAC 2014), Aug 2014, Cape Town, South Africa. ⟨hal-01062776⟩
    • Martha Belem Saldivar, Islam Boussaada, Sabine Mondié, Hugues Mounier, Silviu-Iulian Niculescu. An Overview on the Modeling of Oilwell Drilling Vibrations. 19th IFAC World Congress on International Federation of Automatic Control (IFAC 2014), Aug 2014, Le Cap, South Africa. ⟨10.3182/20140824-6-ZA-1003.00478⟩. ⟨hal-01123663⟩
    • Martha Belem Saldivar, Torsten Knüppel, Frank Woittennek, Islam Boussaada, Hugues Mounier, et al.. Flatness-Based Control of Torsional-Axial Coupled Drilling Vibrations. 19th IFAC World Congress on International Federation of Automatic Control (IFAC 2014), Aug 2014, Le Cap, South Africa. ⟨10.3182/20140824-6-ZA-1003.02205⟩. ⟨hal-01123670⟩
    • Islam Boussaada, Arben Cela, Hugues Mounier, Silviu-Iulian Niculescu. Control of Drilling Vibrations: A Time-Delay System-Based Approach. IFAC 2013 - 5th Symposium on System Structure and Control, Feb 2013, Grenoble, France. pp.226-231. ⟨hal-00935991⟩
    • Islam Boussaada, Wim Michiels, Silviu-Iulian Niculescu. Spectral Analysis for Delay Differential-Algebraic Systems. 10th IFAC Workshop on Time Delay Systems, TDS 2012, Boston, MA, USA, June 22-24, 2012, Jun 2012, Boston, United States. ⟨10.3182/20120622-3-US-4021.00056⟩. ⟨hal-01123683⟩
    • Jing Wang, Islam Boussaada, Arben Cela, Hugues Mounier, Silviu-Iulian Niculescu. Analysis and control of quadrotor via a Normal Form approach. International Symposium on Mathematical Theory of Networks and Systems, Aug 2012, Melbourne, Australia. pp.No. 206. ⟨hal-00781986⟩
    • Islam Boussaada, Hugues Mounier, Silviu-Iulian Niculescu, Arben Cela. Analysis of drilling vibrations: A time-delay system approach. 20th Mediteranean Conference on Control and Automation, Jul 2012, Barcelona, Spain. p. 610-614. ⟨hal-00832013⟩
    • Islam Boussaada, Hugues Mounier, Silviu-Iulian Niculescu, Arben Cela, I. Cyril, et al.. Dynamics analysis of a drillstring model. SIAMCT11, Jul 2011, Baltimore, United States. pp.1-3. ⟨hal-00664588⟩

    Book sections3 documents

    • Islam Boussaada, B. Saldivar, Hugues Mounier, S. Mondié, Arben Cela, et al.. Delay system modeling of rotary drilling vibrations. E. Witrant, E. Fridman, O. Sename, L. Dugard. Recent results on time-delay systems : analysis and Control, 5, Springer : Heidelberg, pp.23-44, 2015, Recent Results on Time-Delay Systems, ⟨10.1007/978-3-319-26369-4_2 ⟩. ⟨hal-01284777⟩
    • Dina Irofti, Islam Boussaada, Silviu-Iulian Niculescu. On the Codimension of the Singularity at the Origin for Networked Delay Systems. A. Seuret, L. Hetel, J. Daafouz, K.H. Johansson Delays and Networked Control Systems , 5, Springer : Heidelberg, pp.3-15, 2015, ⟨10.1007/978-3-319-32372-5_1 ⟩. ⟨hal-01284749⟩
    • Torsten Knüppel, Frank Woittennek, Islam Boussaada, Hugues Mounier, Silviu-Iulian Niculescu. Flatness-Based Control for a Non-Linear Spatially Distributed Model of a Drilling System. Low-Complexity Controllers for Time-Delay Systems, 2014, 978-3-319-05576-3. ⟨10.1007/978-3-319-05576-3_14⟩. ⟨hal-01123691⟩