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2017 November Seminar

The program of the 7th Seminar

Here is the schedule. Each speaker has been asked to take some time to generate some discussion, on top of the traditional questions from the audience.

Wednesday 29th November 2017 - Place LRI (Salle 1018 - bâtiment 660, Rue Noetzlin, 91190 Gif-sur-Yvette)

  • 10:00 - 10:45 : Presentation 
    • Jean-Michel Fourneau (Professor at the University of Versailles) on the subject " Probabilistic Modeling  of Networks with Energy Harvesting : analytical solutions".

      Summary: Présentation de résultats pour les solutions analytiques de réseaux de file d'attente qui permettent de modéliser conjointement les paquets de données et l'énergie consommée pour la transmission et la reception. Le modèle repose sur une discrétisation de l'énergie. On parle alors de paquet d'énergie et on obtient sous des hypothèses classiques (arrivées Poisson, service exponentiels) des modèles à forme produit qui permettent de calculer les délais moyens et les taux de perte liés au manque d'énergie.

  • 11:00 - 11:45 : Presentation
    • Emmanuel Hyon (Professor at University of Paris Nanterre) on the subject "Analysis of performance and energy consumption in the cloud", joint work with Hind Castel, Farah Ail Salaht, Mehdi Kandi.

      SummaryWe analyze here a cloud system represented by  hysteresis multi server queueing system. It is characterized by forward and backward thresholds for activation and deactivation of block of servers representing a set of VMs (Virtual Machines).
      The system is represented by a complex Markov Chain which is difficult to analyze when the size of the system is huge. We propose both analytical and numerical  mathematical methods for deriving the steady-state probability distribution. We compute then performance and energy consumption measures and we define an overall cost taking into account both aspects. We compare the proposed methods with respect to the computation time and  we analyse the impact of some parameters on the behavior of the system.