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Introducing the Keynote & Invited Speakers for the 2nd Annual Online
Conference on the Next Wave of Energy-efficient & Green Technologies
Jean-Yves Le Boudec
EPFL | 
Ken Christensen
University
of South Florida | 
Zhisheng Niu
Tsinghua University | 
Dietrich Zeller
Alcatel-Lucent
Deutschland AG,
Bell Labs Germany |
Keynote & Invited Speaker Program
Jean-Yves Le Boudec
Computer Communications and Applications Laboratory 2, EPFL
Stochastic Analysis of Real and Virtual Energy Storage in the Smart Grid
(Joint work with Nicolas Gast and Dan-Cristian Tomozei)
Energy storage and demand response are used in the smart grid to compensate for fluctuations and forecasting errors in demand and production. Demand response can also be used as a form of storage, where load rather than supply is stored. In the first part of this talk, we propose a system wide model for real time demand response. The model shows that evaporation, namely the fraction of delayed demand that eventually disappears, plays a central role. Further, large backlogs of delayed demand may accumulate. In a second part, we study a model of real storage, using pump hydro. We revisit an existing study by Bejan et al.; we study the impact of energy conversion efficiency and of the quality of wind predictions. We study storage control policies and find strategies that outperform the proposed fixed level policies.
Ken Christensen
Director, Undergraduate Program Department
Computer Science and Engineering, University of South Florida
Green Networks: Substituting, Scheduling, and Consolidating to Save Energy
To reduce the energy consumed by ICT equipment we seek to both reduce peak power use and achieve energy-proportional operation where the power consumed is proportional to load and not capacity. Broadly speaking, there are three ways to reduce energy use at the system level – by substituting, scheduling, and consolidating. As an example of substitution, I will describe work in developing proxies for a range of network protocols and applications including SIP phones. As an example of scheduling, I will describe work with coalescing of packets in Energy Efficient Ethernet (EEE) and of HTTP requests for hybrid web servers. For consolidation I will overview work being done by others in the area of traffic engineering for energy efficiency. I will end the talk with a discussion of some open problems and possible next steps for further reducing energy consumption of both ICT and non-ICT systems focusing on the role of networks.
Zhisheng Niu
Electronic Engineering Department, Tsinghua University
Tsinghua National Lab for Information Science and Technology
Characterizing Energy-Delay Tradeoff in GREEN Communications
One of the key approaches to make the communication networks more GREEN (Globally Resource-optimized and Energy-Efficient Networks) is to have the network architecture and resources more adaptive to the traffic variations, including making some lightly-loaded base stations (BSs) go to sleep. This is the concept of so-called TANGO (Traffic-Aware Network planning and Green Operation) published by the author earlier. To realize this, some delay-insensitive users may have to experience some delay or other kind of QoS degradation when traffic load is high in order to save energy, i.e., energy can be traded off by some delay. The fundamental question then arises: how much energy can be traded off by how long delay?
This talk will characterize the tradeoffs between energy consumption and service delay in a base station with sleep mode operations by queuing models. Address will also investigate the maximum delay for certain percentage of service, which is closely related to the mean delay. In summary, the closed-form tradeoffs cast light on designing BS sleep control policies which aim to save energy while maintaining acceptable quality of service.
Dietrich Zeller
Alcatel-Lucent Deutschland AG, Bell Labs Germany
Green Wireless Access – where we are, where we need to go
The sustainability of mobile infrastructure in the face of the exploding traffic demands is in the centre stage of interest in the research community. Recently one of the most prominent initiatives, the EARTH project, has finished very successfully its work. However, the results of EARTH show, that there is much more potential for energy savings. This needs to be addressed in further research. GreenTouch is one of the ongoing initiatives having as one focal point the energy efficiency of wireless access. The talk will provide a view on the recent results in the research area Green Wireless Access and give an outlook on further directions to be taken.
Lean more about IEEE GreenCom 2012 at www.ieee-greencom.org!
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