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Florian Simatos

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Since February 1st, 2015, I am professor at ISAE in Probability and Statistics in the department of complex systems. Historically, my research interests lied in applied probability, and I have been working on renormalization techniques (functional law of large numbers and central limit theorem) applied to branching processes and models of communication networks. My PhD thesis is available here and by HDR manuscript here.
Since my arrival at ISAE SUPAERO, my interests have switched. From a mathematical perspective, I am now working on statistical problems related to reliability theory. For instance, I am currently working on analysing the behavior of importance sampling in high-dimension, which is the subject of Jason Beh's PhD thesis.
Moreover, I have begun a completely different stream of research, and I am now actively working in the field of aeronautics and more specifically on sustainable aviation. One of my current project is for instance to broaden the analysis of the environmental impact of the aviation sector beyond climate, which is the subject of Bastien Païs' PhD thesis.

Short bio prior to joining ISAE

  • 2014: Researcher at Inria (France).
  • 2014: Lecturer at Ecole Normale Supérieure de Paris (France).
  • 2012–2013: Post-doc at Eindhoven University of Technology (Netherlands) with Sem Borst.
  • 2010–2011: Post-doc at CWI (Netherlands) with Bert Zwart.
  • 2006–2009: PhD at Inria (France) under the supervision of Philippe Robert.
  • 2005: Master of Science at Stanford (USA) in Electrical Engineering.
  • 2001–2004: Undergraduate studies at Ecole Polytechnique (France).

Publications in journals

  1. Optimal projection to improve parametric importance sampling in high dimension. (pdf)
    With M. Elmasri and J. Morio.
    Accepted for publication in Computo.
  2. Sustainable aviation in the context of the Paris Agreement: A review of prospective scenarios and their technological mitigation levers.
    With S. Delbecq, J. Fontane, N. Gourdain and T. Planès.
    Progress in Aerospace Sciences , 141:100920, 2023.
  3. Singular perturbation for a two-class Processor-Sharing queue with impatience. (pdf)
    With R. Nasri and A. Simonian.
    Stochastic Models, 39(3):502-536, 2022.
  4. Improvement of the cross-entropy method in high dimension through a one-dimensional projection without gradient estimation. (pdf)
    With M. Elmasri and J. Morio.
    Reliability Engineering & System Safety, 216 (2021), 107991.
  5. Simultaneous estimation of complementary moment independent sensitivity measures for reliability analysis. (pdf)
    With P. Derennes and J. Morio.
    Mathematics and Computers in Simulation, 182:721-737, April 2021.
  6. Induced idleness leads to deterministic heavy traffic limits for queue-based random-access algorithms. (pdf)
    With S. Borst, E. Castiel, L. Miclo and P. Whiting.
    The Annals of Applied Probability, 31(2):941-971, 2021.
  7. Mobility can drastically improve the heavy traffic performance from 1/(1-rho) to -log(1-rho). (pdf)
    With A. Simonian.
    Queueing Systems, 95:1–28, 2020.
  8. Height and contour processes of Crump-Mode-Jagers forests (II): The Bellman-Harris universality class. (pdf)
    With E. Schertzer.
    Electronic Journal of Probability, 24, paper no. 47, 38 pp, 2019.
  9. A nonparametric importance sampling estimator for moment independent importance measures. (pdf)
    With P. Derennes and J. Morio.
    Reliability Engineering and System Safety, 187:3-16, 2019.
  10. Height and contour processes of Crump-Mode-Jagers forests (I): general distribution and scaling limits in the case of short edges. (pdf)
    With E. Schertzer.
    Electronic Journal of Probability, Volume 23, paper no. 67, 43 pp, 2018.
  11. Scaling limit of a limit order book model via the regenerative characterization of Lévy trees. (pdf)
    With P. Lakner and J. Reed.
    Stochastic Systems, 7(2):342-373, 2017.
  12. Tightness for processes with fixed points of discontinuities and applications in varying environment. (pdf)
    With V. Bansaye and T. Kurtz.
    Electronic Communications in Probability, 21(81):1-9, 2016.
  13. On the scaling limits of Galton-Watson processes in varying environments. (pdf)
    With V. Bansaye.
    Electronic Journal of Probability, 20(75):1-36, 2015.
  14. State space collapse for critical multistage epidemics. (pdf)
    Advances in Applied Probability, 47(3):715-740, 2015.
  15. Asymptotic behavior of local times of compound Poisson processes with drift in the infinite variance case. (pdf)
    With A. Lambert.
    Journal of Theoretical Probability, 28(1):41-91, 2015.
  16. Coupling limit order books and branching random walks. (pdf)
    Journal of Applied Probability, 51(3):625-639, 2014.
  17. Lingering issues in distributed scheduling. (pdf)
    F. Simatos, N. Bouman and S. Borst.
    Queueing Systems, Theory and Applications, 77(2):243-273, 2014.
  18. The weak convergence of regenerative processes using some excursion path decompositions. (pdf)
    With A. Lambert.
    Annales de l'Institut Henri Poincaré (B) Probabilités et Statistiques, 50(2):492-511, May 2014.
  19. Scaling limits via excursion theory: Interplay between Crump-Mode-Jagers branching processes and Processor-Sharing queues. (pdf)
    With A. Lambert and B. Zwart.
    The Annals of Applied Probability, 23(6):2357-2381, December 2013.
  20. A stochastic network with mobile users in heavy traffic. (pdf)
    With S. Borst.
    Queueing Systems, Theory and Applications, 74(1):1-40, May 2013.
  21. A performance analysis of channel fragmentation in dynamic spectrum access systems. (pdf)
    E. Coffman, P. Robert, F. Simatos, S. Tarumi and G. Zussman.
    Queueing Systems, Theory and Applications, 71(3):293-320, July 2012.
  22. Load balancing via randomised local search in closed and open systems. (pdf)
    A. Ganesh, S. Lilenthal, D. Manjunath, A. Proutiere and F. Simatos.
    Queueing Systems, Theory and Applications, 71(3):321-345, July 2012.
  23. Interacting branching processes and linear file-sharing networks. (pdf)
    With L. Leskelä and P. Robert.
    Advances in Applied Probability, 42(3):834-854, September 2010.
  24. Spatial homogenization in a stochastic network with mobility. (pdf)
    With D. Tibi.
    The Annals of Applied Probability, 20(1):321-355, February 2010.
  25. Occupancy schemes associated to Yule processes. (pdf)
    With P. Robert.
    Advances in Applied Probability, 41(2):600–622, June 2009.

Publications in conferences

  1. Cost estimation of the use of low-carbon fuels in prospective scenarios for air transport. (pdf)
    A. Salgas, T. Planès, S. Delbecq, G. Lafforgue and F. Simatos.
    In AIAA SCITECH 2023 Forum, 23-27 January 2023 National Harbor, MD & Online. https://doi.org/10.2514/6.2023-2328
  2. Aviation and climate: the state-of-the-art. (pdf)
    S. Delbecq, J. Fontane, N. Gourdain, H. Mugnier, T. Planès and F. Simatos.
    In 56th 3AF International Conference on Applied Aerodynamics.
  3. On the impact of mobility in cellular networks. (pdf)
    E. Anton, U. Ayesta and F. Simatos.
    WiOpt 2019.
  4. Estimation Of moment Independent Importance Measures Using a Copula And Maximum Entropy Framework. (pdf)
    P. Derennes, J. Morio and F. Simatos.
    Winter Simulation Conference 2018.
  5. Lingering issues in distributed scheduling. (pdf)
    F. Simatos, N. Bouman and S. Borst.
    ACM SIGMETRICS 2013.
  6. Channel Fragmentation in Dynamic Spectrum Access Systems - a Theoretical Study. (pdf)
    E. Coffman, P. Robert, F. Simatos, S. Tarumi and G. Zussman.
    ACM SIGMETRICS 2010.
  7. Load balancing via randomised local search in closed and open systems. (pdf)
    A. Ganesh, S. Lilenthal, D. Manjunath, A. Proutiere and F. Simatos.
    ACM SIGMETRICS 2010. Best paper award.
  8. A queueing system for modeling a file-sharing principle. (pdf)
    F. Simatos, P. Robert and F. Guillemin.
    ACM SIGMETRICS 2008.
  9. A variant of the recoil growth algorithm to generate multi-polymer systems. (pdf)
    F. Simatos.
    Fifth Colloquium on Discrete Mathematics and Theoretical Computer Science, 2008.
  10. Hybrid RTS/CTS mechanism in Wi-Fi Ad Hoc networks with correlated channel failures. (pdf)
    F. Simatos and A. Lyakhov.
    IMACS 2005.

Book chapter

  • Nonparametric importance sampling techniques for sensitivity analysis and reliability assessment of a launcher stage fallout.
    With P. Derennes, V. Chabridon, J. Morio, M. Balesdent, F. Simatos, J-M. Bourinet and M. Gayton.
    Optimization in Space Engineering, 2019. Edited by G. Fasano and J. Pinter, Springer.
  • Performance Analysis of Data Traffic in Small Cells Networks with User Mobility.
    With A. Simonian and P. Olivier.
    Systems Modeling: Methodologies and Tools, 177-193, 2019. Edited by Antonio Puliafio and Kishor S. Trivedi, EAI/Springer Innovations in Communication and Computing.
  • Advanced branching processes. (link to paper, or contact me to get a copy)
    Wiley Encyclopedia in Operations Research and Management Science, 1-11, 2013. Edited by James J. Cochran, John Wiley & Sons.

Miscellaneous

  • ISAE-SUPAERO Aviation and Climate: a literature review.
    With S. Delbecq, J. Fontane, N. Gourdain, H. Mugnier and T. Planès.
    https://doi.org/10.34849/a66a-vv58, May 2022 (French version available here).
  • Uncertainties on plastic concentration estimates at sea.
    With M. Mercier, M. Poulain-Zarcos, A. ter Halle and M. Saint-Martin.
    EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5026, https://doi.org/10.5194/egusphere-egu21-5026, 2021.

Preprints

  1. Height and contour processes of Crump-Mode-Jagers forests (III): The binary, homogeneous universality class. (pdf)
    With E. Schertzer.
  2. Insight from the Kullback-Leibler divergence into adaptive importance sampling schemes for rare event analysis in high dimension. (pdf)
    With J. Beh and Y. Shadmi.

PhD students

  • 2023-, Jason Beh, co-supervised with Jérôme Morio
    Dégénérescence des poids de l'échantillonnage préférentiel adaptatif en grande dimension
  • 2022-, Bastien Païs, co-supervised with Lorie Hamelin and Alexandre Gondran.
    Aviation et limites planétaires
  • 2019-2022, Maxime El Masri, co-supervised with Jérôme Morio.
    Mesures de sensibilité de Borgonovo : estimation des indices d'ordre un et supérieur, et application à l'étude de fiabilité.
  • 2018-2021, Paolo Panicucci, co-supervised with Emmanuel Zenou.
    Navigation basée vision autonome et reconstruction de forme d’un astéroïde inconnu pendant la phase d'approche
  • 2016-2019, Pierre Derennes, co-supervised with Jérôme Morio.
    Mesures de sensibilité de Borgonovo : estimation des indices d'ordre un et supérieur, et application à l'étude de fiabilité
  • 2016-2019, Eyal Castiel, co-supervised with Laurent Miclo.
    Etude du protocole d'accès CSMA-QB

Honours

  • 2014 ACM SIGMETRICS Rising Star Researcher Award (press release).
  • ACM SIGMETRICS 2010 Best Paper Award (Co-recipients: A. Ganesh, S. Lilenthal, D. Manjunath and A. Proutiere).

Contact information

Email address: firstname(=florian).lastname(=simatos)@isae.fr
Phone number: +33 5 61 33 81 03
Fax number: +33 5 61 33 83 45
Office: 07.0106

Post address:

ISAE Supaero
Département DISC
10 avenue Edouard Belin
BP 54032
31055 TOULOUSE CEDEX 4
France

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