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  • Olivier Berder, Université Rennes 1, IRISA
  • Anne Blavette, CNRS, SATIE
  • Carole Charbuillet, ENSAM
  • Dino Lopez Pacheco, Université de Nice, I3S
  • Nicolas Montavont, IMT Atlantique, IRISA
  • Olivier Sentieys, Inria, IRISA



  Olivier Berder


  Anne Blavette

From traditional electrical networks to smart grids

Bio: Anne Blavette obtained her PhD thesis in electrical engineering from University College Cork, Ireland in 2013. Her thesis focused on the grid integration of wave energy farms and the generic modelling of marine energy converters for power system studies. In 2014, she worked on the flicker induced by tidal farms subject to relatively energetic wave conditions at the IREENA research centre, University of Nantes, France. In 2015, she obtained a European Marie Curie Post-doctoral Fellowship to work at the SATIE research centre, Ecole Normale Supérieure de Rennes, France in the field of optimal energy management and power quality in coastal smart grids. Since 2015, she has been a permanent CNRS researcher at the SATIE research centre. Among other activities, she has been the scientific leader of the RennesGrid project (led by Schneider Electric and funded by ADEME) since 2017. This project aims at investigating the optimal management of both the electrical network and of its ICT control infrastructure, among others. Her research interests are in the field of optimal energy management of both the electrical network and of its ICT control infrastructure, power quality, and renewables grid integration.
Talk: The presentation will focus on the electrical networks and their management, as well as on the radical change induced by their transformation into “smart grids”. The general principles of electrical network design and management will be introduced, as well as intelligent, and more sustainable, approaches such as: demand side management (including dynamic electric vehicle charging), real-time electrical equipment management, etc. which will require the massive use of ICTs.

  Carole Charbuillet

Life Cycle Analysis and ICT : principles, main issues and limits

BioCarole Charbuillet is a research engineer at The Arts et Métiers Institute in Chambéry, France, since 2010. She obtained her PhD thesis in industrial engineering in 2009.  Her main research interests are: Life Cycle Analysis (LCA) of products like ICT with a focus on the end-of-life phase and design for recycling. For example, she helps manufacturers to integrate LCA in their R&D process in order to develop projects with less environmental impacts. She makes also training sessions on these two subjects for students and manufacturers. Carole Charbuillet is a member of EcoInfo since 2010.
Talk: ICT appears as a solution to reduce the environmental impacts of many applications (online purchase, teleworking…). However, what are the real environmental impacts (positive and negative) of such technology? How can we measure them along their life cycle? The presentation will focus on the Life Cycle Analysis Methodology (LCA). LCA is a methodology to quantify the environmental impacts of products. The principles of LCA will be introduced. They are defined by the ISO 14040 norm. The main characteristics and also the limits of the method will be presented. Then a focus will be done on LCA and ICT through some examples. The objective is to highlight the major environmental issues of ICT for each life stage.

  Dino Lopez Pacheco

Towards Realistic Devices Shutdown Strategies in ISP and Data Center networks

Bio: Dino Lopez Pacheco is currently Associate Professor at the University Nice Sophia Antipolis, France, from September 2009. Between September 2008 and July 2009, he did a post-doc at the Institut Supérieur de l’Aéronautique et de l’Espace, in Toulouse, France. He prepared his Ph.D. at the LIP laboratory of the Ecole Normale Supérieure in Lyon, France and obtained his Ph.D. diploma in July 2008. The main research interests of Dino López concern the study of performance and resilience of SDN-based networks; the study of the Virtualization and Migration in Data Center scenarios, from both the transport and the network layers perspective; and the study of energy optimization in both ISP and Data Center networks.
 Talk: According to some recent studies, end hosts and network access, network backbone and data centers are globally responsible of one third of the energy consumption of ICT. To reduce the energy footprint of networks, one of the most effective approaches is to turn off  unused equipments, which might hurt the user’s Quality of Experience. In this presentation, we will explore how we can indeed (i) turn forwarding devices off, e.g. routers, in an Internet Service Provider (ISP) network; or (ii) turn off servers in Data Centers, while mitigating the negative impact on the perceived users’ QoE.
For ISP networks, we present an integral solution where the network provider can leverage Software Defined Network based Points-of-Presence (SDN-based PoPs) deployed around legacy PoP to smartly adapt the number of active devices. We assume legacy PoPs driven by a classical interior gateway routing protocol, like the Open Shortest Path First (OSPF) protocol. Our solution has been enriched with a set of features to safely turn off network devices: tunneling for fast re-routing, smooth node disabling and detection of both traffic spikes and link failures.
In Data Centers (DCs), we tackle the problem of idle virtual machines (VMs) awaiting for incoming connections and/or keeping established-and-idling sessions. We propose a novel solution to turn off idle VMs, without incurring into network-, transport- or application-based disconnections. To do so, we transform a fully-fledged idle VMs into a lightweight and resourceless virtual network functions (VNFs), and then reduce the allocated memory of those idle VMs. Finally, a fast VM restoration strategy upon user activity detection provides SLA protection. The de-allocated memory from idle VMs can be reassigned to new VMs or lead to massive consolidation in physical servers to decrease the energy footprint of DCs.

  Nicolas Montavont



  Olivier Sentieys

Energy Efficiency of Computing Architectures – A Deep Dive into Processors and Emerging Computing Machines

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