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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. He was the head of the laboratory for 10 years (2010-2019). Co-founder of the Inria team "DISCO" (common team of Inria with CNRS and CentraleSupélec, located at L2S) in 2010, he is also an active member of the team.

Dr. Niculescu 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 2020)  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) since 2017 and he was the chair of the IFAC Research Group on "Time-delay systems" (2007 and vice-chair of the IFAC Technical Committee on Control Linear Systems (TC 2.2) for the period 2011-2017. 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.


"Keqin Gu"   

Journal articles14 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. ⟨10.1109/TAC.2018.2832459⟩. ⟨hal-01957472⟩
  • 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⟩
  • Rifat Sipahi, Silviu-Iulian Niculescu, Chaouki Abdalla, Wim Michiels, Keqin Gu. Stability and stabilization of systems with time delay. IEEE Control Systems, Institute of Electrical and Electronics Engineers, 2011, 31 (1), pp.38-65. ⟨10.1109/MCS.2010.939135⟩. ⟨hal-00664367⟩
  • Irinel-Constantin Morarescu, Silviu-Iulian Niculescu, Keqin Gu. The geometry of stability crossing curves of PI controllers for SISO systems with I/O delays. Revue roumaine de mathématiques pures et appliquées, Editura Academiei Române, 2010, 55 (4), pp.297-313. ⟨hal-00664359⟩
  • Silviu-Iulian Niculescu, P.S. Kim, Keqin Gu, P.P. Lee, D. Levy. Stability crossing boundaries of delay systems modeling immune dynamics in Ieukemia. Discrete and Continuous Dynamical Systems - Series B, American Institute of Mathematical Sciences, 2010, 15 (1), pp.129-156. ⟨10.3934/dcdsb.2009.13.129⟩. ⟨hal-00557924⟩
  • Irinel-Constantin Morarescu, Silviu-Iulian Niculescu, Keqin Gu. On the geometry of stability regions of Smith predictors subject to delay uncertainty. IMA Journal of Mathematical Control and Information, Oxford University Press (OUP), 2007, 24 (3), pp.411-423. ⟨10.1093/imamci/dnl032⟩. ⟨hal-02271896⟩
  • Irinel-Constantin Morarescu, Silviu-Iulian Niculescu, Keqin Gu. Stability crossing curves of shifted gamma-distributed delay systems. SIAM Journal on Applied Dynamical Systems, Society for Industrial and Applied Mathematics, 2007, 6 (2), pp.475-493. ⟨10.1137/060670766⟩. ⟨hal-02271891⟩
  • Keqin Gu, Silviu-Iulian Niculescu, Jie Chen. On stability crossing curves for general systems with two delays. Journal of Mathematical Analysis and Applications, Elsevier, 2005, 311 (1), pp.231-253. ⟨10.1016/j.jmaa.2005.02.034⟩. ⟨hal-02294292⟩
  • Silviu-Iulian Niculescu, Keqin Gu. Robust stability of some oscillatory systems including time-varying delay with applications in congestion control. ISA Transactions, 2003, 42 (4), pp.595-603. ⟨hal-02294778⟩
  • Keqin Gu, Silviu-Iulian Niculescu. Survey on recent results in the stability and control of time-delay systems. Journal of Dynamic Systems, Measurement, and Control, American Society of Mechanical Engineers, 2003, 125 (2), pp.158-165. ⟨10.1115/1.1569950⟩. ⟨hal-02294779⟩
  • Keqin Gu, Silviu-Iulian Niculescu. Further remarks on additional dynamics in various model transformations of linear delay systems. IEEE Transactions on Automatic Control, Institute of Electrical and Electronics Engineers, 2001, 46 (3), pp.497-500. ⟨10.1109/9.911431⟩. ⟨hal-02295731⟩
  • Keqin Gu, Q.-L. Han, A.C.J. Luo, Silviu-Iulian Niculescu. Discretized Lyapunov functional for systems with distributed delay and piecewise constant coefficients. International Journal of Control, Taylor & Francis, 2001, 74 (7), pp.737-744. ⟨10.1080/00207170010031486⟩. ⟨hal-02295739⟩
  • Keqin Gu, Silviu-Iulian Niculescu. Additional dynamics in transformed time-delay systems. IEEE Transactions on Automatic Control, Institute of Electrical and Electronics Engineers, 2000, 45 (3), pp.572-575. ⟨10.1109/9.847747⟩. ⟨hal-02299342⟩

Conference papers23 documents

  • C. Jin, Keqin Gu, Silviu-Iulian Niculescu, Islam Boussaada. Stability Analysis of Systems with Delay-Dependent Coefficients Subject to Some Particular Delay Structure. 16th European Control Conference, ECC 2018, Jun 2018, Limassol, Greece. pp.1208-1213, ⟨10.23919/ECC.2018.8550042⟩. ⟨hal-02281718⟩
  • 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⟩
  • 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⟩
  • Chi Jin, Keqin Gu, Islam Boussaada, Silviu-Iulian Niculescu. Stability Analysis of Systems with Delay-Dependant Coefficients a two-Parameter Approach. American Control Conference (ACC), May 2017, Seattle, WA, United States. ⟨10.23919/acc.2017.7963847⟩. ⟨hal-02276317⟩
  • 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, 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⟩
  • 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⟩
  • Irinel-Constantin Morarescu, César Fernando Méndez Barrios, Silviu-Iulian Niculescu, Keqin Gu. Stability crossing boundaries and fragility characterization of PID controllers for SISO systems with I/O Delays.. American Control Conference, ACC 2011, Jun 2011, San Francisco, United States. pp.4988 - 4993. ⟨hal-00637998⟩
  • César Fernando Méndez Barrios, Silviu-Iulian Niculescu, Irinel-Constantin Morarescu, Keqin Gu. On the Fragility of PI Controllers for Time-Delay SISO Systems. 16th Mediterranean Conference on Control and Automation, Jun 2008, Ajaccio, France. ⟨hal-02194366⟩
  • Irinel-Constantin Morarescu, Silviu-Iulian Niculescu, Keqin Gu. On the geometry of pi controllers for SISO systems with input delays. 7th IFAC Workshop on Time Delay Systems TDS 2007, Sep 2007, Nantes, France. pp.129-134, ⟨10.1016/S1474-6670(17)69275-9⟩. ⟨hal-02293066⟩
  • Irinel-Constantin Morarescu, Silviu-Iulian Niculescu, Keqin Gu. Some remarks on Smith predictors A geometric point of view. 6th IFAC Workshop on Time Delay Systems, TDS 2006, Jul 2006, L'Aquila, Italy. pp.264-269. ⟨hal-02294066⟩
  • Silviu-Iulian Niculescu, P.S. Kim, Keqin Gu, Doron Levy. On the stability crossing boundaries of some delay systems modeling immune dynamics in leukemia.. 17th international Symposium on Mathematical Theory of Networks and Systems (MTNS), Jul 2006, Kyoto, Japan. ⟨hal-02295890⟩
  • Irinel-Constantin Morarescu, Silviu-Iulian Niculescu, Keqin Gu. Remarks on the stability crossing curves of linear systems with distributed delay. Conference on Differential and difference Equations and Applications, E. Braverman; A. Domoshnitsky; X.Liu, Aug 2005, Melbourne, United States. ⟨hal-02296585⟩
  • Keqin Gu, Silviu-Iulian Niculescu, Jie Cheng. On calculating the maximal radius of delay deviation. Mini Symposium Riccati Equations and Applications, G Freiling, Jul 2004, Leuven, Belgium. ⟨hal-02296721⟩
  • Keqin Gu, Silviu-Iulian Niculescu, Jie Cheng. On stability of crossing curves for general systems with two delays. 5th IFAC Workshop on Time Delay Systems, Sep 2004, Leuven, Belgium. ⟨hal-02296736⟩
  • Silviu-Iulian Niculescu, Vladimir Rasvan, Keqin Gu. On delay-dependent stability in lossless propagation models : a Lyapunov-Krasovskii analysis. 11th IEEE Mediterranean Conference Control Automation, Jun 2003, Rhodes, Greece. ⟨hal-02296787⟩
  • D. Taoutaou, Silviu-Iulian Niculescu, Keqin Gu. Robust stability of teleoperation schemes subject to constant and time-varying communication delays. 42nd IEEE Conference on Decision and Control, Dec 2003, Maui, United States. pp.5579-5584, ⟨10.1109/CDC.2003.1271890⟩. ⟨hal-02294772⟩
  • Silviu-Iulian Niculescu, Keqin Gu, C.T. Abdallah. Some Remarks on the Delay Stabilizing Effect in SISO systems. 2003 American Control Conference, Jun 2003, Denver, United States. pp.2670-2675. ⟨hal-02294782⟩
  • Silviu-Iulian Niculescu, Keqin Gu. Robust stability of some oscillatory systems including time-varing delay with applications in congestion control. 4th Asian Control Conference, Sep 2002, Singapour, Singapore. ⟨hal-02296855⟩
  • Keqin Gu, S.-I. Niculescu. Further remarks on additional dynamics in various model transformations of linear delay systems. 2000 American Control conference, Jun 2000, Chicago, United States. pp.4368-4372. ⟨hal-02304637⟩
  • Keqin Gu, Albert Luo, Silviu-Iulian Niculescu. Discretized Lyapunov functional for systems with distributed delay. 1999 European Control Conference (ECC), Aug 1999, Karlsruhe, Germany. pp.3649-3654, ⟨10.23919/ECC.1999.7099897⟩. ⟨hal-02304348⟩
  • Vladimir B. Kolmanovskii, Silviu-Iulian Niculescu, Keqin Gu. Delay effects on stability a survey. The 38th IEEE Conference on Decision and Control (CDC), Dec 1999, Phoenix, United States. pp.1993-1998. ⟨hal-02299333⟩
  • Keqin Gu, Silviu-Iulian Niculescu. Additional dynamics in transformed time-delay systems. The 38th IEEE Conference on Decision and Control (CDC), Siviu Iulian Niculescu; Keqin Gu, Dec 1999, Phoenix, United States. pp.4673-4677. ⟨hal-02299334⟩

Book sections6 documents

  • Silviu-Iulian Niculescu, Wim Michiels, Keqin Gu, Chaouki Abdallah. Delay Effects on Output Feedback Control of Dynamical Systems. Complex Time-Delay Systems, pp.63-84, 2009, ⟨10.1007/978-3-642-02329-3_3⟩. ⟨hal-02329731⟩
  • Keqin Gu, Silviu-Iulian Niculescu, Jie Chen. Computing maximum delay deviation allowed to retain stability in systems with two delays. Applications of Time Delay Systems, 352, pp.157-164, 2007, Lecture Notes in Control and Information Sciences book series (LNCIS), ⟨10.1007/978-3-540-49556-7_10⟩. ⟨hal-02271893⟩
  • Silviu-Iulian Niculescu, Irinel-Constantin Morarescu, Wim Michiels, Keqin Gu. Geometric ideas in the stability analysis of delay models in biosciences. Queinnec, I; Tarbouriech, S; Garcia, G; Niculescu, SI. Biology and Control Theory: Current Challenges, 357, SPRINGER-VERLAG BERLIN, 2007, Lecture Notes in Control and Information Sciences book series (LNCIS), ⟨10.1007/978-3-540-71988-5_10⟩. ⟨hal-02194455⟩
  • Keqin Gu, Silviu-Iulian Niculescu. Stability analysis of time-delay systems A Lyapunov approach. A Loria; francoise-lamnabhi-lagarrigue; elena panteley. Advances topics in control systems theory : Lectures notes from FAP 2005, 328, pp.139-170, 2006, ⟨10.1007/11583592_4⟩. ⟨hal-02294074⟩
  • Silviu-Iulian Niculescu, Wim Michiels, Daniel Melchor-Aguillar, T. Luzyanina, Frédéric Mazenc, et al.. Delay Effects on the Asymptotic Stability of Various Fluid Models in High-Performance Networks. Advances in communication control networks, 308, pp.87-110, 2005, LNCIS. ⟨hal-02294302⟩
  • D. Taoutaou, Silviu-Iulian Niculescu, Keqin Gu. Closed-loop stability of a teleoperation control scheme subject to time-varying communication delays. Silviu Iulian Niculescu; Keqin Gu. Advances in time-delay systems, 38, pp.327-338, 2004. ⟨hal-02329778⟩

Directions of work or proceedings2 documents

  • Silviu-Iulian Niculescu, Keqin Gu. Advances in Time-Delay Systems. Niculescu, Silviu-Iulian; Gu, Keqin. 38, Springer-Verlag Berlin Heidelberg, pp.452, 2004, Lecture Notes in Computational Science and Engineering, 978-3-642-18482-6. ⟨10.1007/978-3-642-18482-6⟩. ⟨hal-02183314⟩
  • Keqin Gu, Chaouki Abdallah, Silviu-Iulian Niculescu. Time Delay Systems. Pergamon, 282 p., 2002, IFAC Proceedings Volumes, 9780080440040. ⟨hal-02183387⟩