University of Reims Champagne Ardenne

Displaying 1-16 of 16 results

  • White Papers // Jan 2014

    Autoscaling Web Applications in Heterogeneous Cloud Infrastructures

    Improving resource provisioning of heterogeneous cloud infrastructures is an important research challenge. The wide diversity of cloud-based applications and customers with different QoS requirements has recently exhibited the weaknesses of current provisioning systems. Today's cloud infrastructures provide provisioning systems that dynamically adapt the computational power of applications by adding or...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Sep 2013

    Security Amplification Against Meet-in-the-Middle Attacks Using Whitening

    In this paper the authors introduce a model for studying meet-in-the-middle attacks on block ciphers, and a simple block cipher construction provably resistant to such attacks in this model. A side-result of this is a proper formalization for an unproven alternative to DESX proposed by the researcher; this construction can...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Aug 2013

    ReqFlex: Fuzzy Queries for Everyone

    The last decade has witnessed an increasing interest in expressing preferences inside DataBase (DB) queries. As a matter of fact, the first research works on this topic date back to the late 80s, see for instance. Motivations for such a concern are manifold. It has appeared to be desirable to...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Nov 2012

    A Case for Fully Decentralized Dynamic VM Consolidation in Clouds

    One way to conserve energy in cloud data centers is to transition idle servers into a power saving state during periods of low utilization. Dynamic Virtual Machine (VM) Consolidation (VMC) algorithms are proposed to create idle times by periodically repacking VMs on the least number of Physical Machines (PMs). Existing...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Aug 2012

    Majority-Rule-Based Web Service Selection

    Determining the appropriate service for a user request is a two step process. Initially, the available services whose description agrees with that of the request service are discovered. Then, the service selection process assists users in choosing the service that better matches their intention. In many practical situations, the responsibility...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Jul 2012

    A Unified Hardware/software Co-Synthesis Solution for Signal Processing Systems

    In this paper, the authors present a methodology to specify from a high-level data-flow description an application for both hardware and software synthesis. An introduction to RVC-CAL data-flow programming and Orcc framework is presented. Furthermore, an analysis of a close to gate intermediate representation (XLIM) is bestowed. As a proof...

    Provided By University of Reims Champagne Ardenne

  • White Papers // May 2012

    A Low Energy Consumption MAC Protocol for WSN

    The design of an energy-efficient Medium Access Control (MAC) protocol is one of the major issues in Wireless Sensor Networks (WSN). In this paper, the authors present a MAC protocol adapted to a particular class of WSNs. This protocol is mainly used for nodes located in the same radio range....

    Provided By University of Reims Champagne Ardenne

  • White Papers // May 2012

    A_PSQA: PESQ-Like Non-Intrusive Tool for QoE Prediction in VoIP Services

    Perceived speech quality, or Quality of Experience (QoE), is the key criteria for evaluating VoIP service. Most of the existing solutions are intrusive, in a sense where they require both the original and the transmitted audio sequences. These solutions give good estimation of the QoE, but they cannot be used...

    Provided By University of Reims Champagne Ardenne

  • White Papers // May 2012

    QoS/QoE Predictions-Based Admission Control for Femto Communications

    Due to their numerous advantages, current trends show a growing number of femtocell deployments. However, femtocells would become less attractive to the general consumers if they cannot keep up with the service quality that the macro cellular network should provide. Given the fact that the quality of mobile services provided...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Mar 2012

    QoE-Based Energy Conservation for VoIP Over WLAN

    Minimizing energy consumption is becoming more and more crucial in today's mobile terminals communications. Reducing its use pass necessarily by exploiting low power design techniques and by adopting novel energy-aware applications and protocols. The focus in this paper mainly concerns the Voice over IP over Wireless Local Area Network (VoWLAN)...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Sep 2010

    Shared Data Cache Conflicts Reduction for WCET Computation in Multi-Core Architectures

    The use of multi-core architectures in real-time systems raises new issues regarding the estimation of safe and tight worst-case execution times. Indeed, the sharing of hardware resources occurring on such architectures is a new source of indeterminism. Caches, as one of these shared assets, become harder to analyze; concurrent tasks...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Jan 2010

    PowWow : Power Optimized Hardware/Software Framework for Wireless Motes

    An energy-efficient platform for wireless sensor networks and its dedicated software framework are described and optimizations are proposed at both hardware and software level. The hardware is based on low cost and low power components linked in a multilayer architecture. Some processing, such as error correcting codes is accelerated by...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Aug 2009

    A Quality-Centric Data Model for Distributed Stream Management Systems

    It is challenging for large-scale stream management systems to return always perfect results when processing data streams originating from distributed sources. Data sources and intermediate processing nodes may fail during the lifetime of a stream query. In addition, individual nodes may become overloaded due to processing demands. In practice, users...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Mar 2009

    A Generic Architecture of CCSDS Low Density Parity Check Decoder for Near-Earth Applications

    Low Density Parity Check (LDPC) codes have recently been chosen in the CCSDS standard for uses in near-earth applications. The specified code belongs to the class of Quasi-Cyclic LDPC codes which provide very high data rates and high reliability. Even if these codes are suited to high data rate, the...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Oct 2008

    Enabling Lock-Free Concurrent Fine-Grain Access to Massive Distributed Data: Application to Supernovae Detection

    The authors consider the problem of efficiently managing massive data in a large-scale distributed environment. They consider data strings of size in the order of Terabytes, shared and accessed by concurrent clients. On each individual access, a segment of a string, of the order of Megabytes, is read or modified....

    Provided By University of Reims Champagne Ardenne

  • White Papers // Oct 2008

    Distributed Management of Massive Data: an Efficient Fine-Grain Data Access Scheme

    In this paper, the authors addresses the problem of efficiently storing and accessing massive data blocks in a large-scale distributed environment, while providing efficient fine-grain access to data subsets. This issue is crucial in the context of applications in the field of databases, data mining and multimedia. They propose a...

    Provided By University of Reims Champagne Ardenne

  • White Papers // May 2012

    A Low Energy Consumption MAC Protocol for WSN

    The design of an energy-efficient Medium Access Control (MAC) protocol is one of the major issues in Wireless Sensor Networks (WSN). In this paper, the authors present a MAC protocol adapted to a particular class of WSNs. This protocol is mainly used for nodes located in the same radio range....

    Provided By University of Reims Champagne Ardenne

  • White Papers // May 2012

    A_PSQA: PESQ-Like Non-Intrusive Tool for QoE Prediction in VoIP Services

    Perceived speech quality, or Quality of Experience (QoE), is the key criteria for evaluating VoIP service. Most of the existing solutions are intrusive, in a sense where they require both the original and the transmitted audio sequences. These solutions give good estimation of the QoE, but they cannot be used...

    Provided By University of Reims Champagne Ardenne

  • White Papers // May 2012

    QoS/QoE Predictions-Based Admission Control for Femto Communications

    Due to their numerous advantages, current trends show a growing number of femtocell deployments. However, femtocells would become less attractive to the general consumers if they cannot keep up with the service quality that the macro cellular network should provide. Given the fact that the quality of mobile services provided...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Mar 2012

    QoE-Based Energy Conservation for VoIP Over WLAN

    Minimizing energy consumption is becoming more and more crucial in today's mobile terminals communications. Reducing its use pass necessarily by exploiting low power design techniques and by adopting novel energy-aware applications and protocols. The focus in this paper mainly concerns the Voice over IP over Wireless Local Area Network (VoWLAN)...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Aug 2012

    Majority-Rule-Based Web Service Selection

    Determining the appropriate service for a user request is a two step process. Initially, the available services whose description agrees with that of the request service are discovered. Then, the service selection process assists users in choosing the service that better matches their intention. In many practical situations, the responsibility...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Nov 2012

    A Case for Fully Decentralized Dynamic VM Consolidation in Clouds

    One way to conserve energy in cloud data centers is to transition idle servers into a power saving state during periods of low utilization. Dynamic Virtual Machine (VM) Consolidation (VMC) algorithms are proposed to create idle times by periodically repacking VMs on the least number of Physical Machines (PMs). Existing...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Mar 2009

    A Generic Architecture of CCSDS Low Density Parity Check Decoder for Near-Earth Applications

    Low Density Parity Check (LDPC) codes have recently been chosen in the CCSDS standard for uses in near-earth applications. The specified code belongs to the class of Quasi-Cyclic LDPC codes which provide very high data rates and high reliability. Even if these codes are suited to high data rate, the...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Sep 2010

    Shared Data Cache Conflicts Reduction for WCET Computation in Multi-Core Architectures

    The use of multi-core architectures in real-time systems raises new issues regarding the estimation of safe and tight worst-case execution times. Indeed, the sharing of hardware resources occurring on such architectures is a new source of indeterminism. Caches, as one of these shared assets, become harder to analyze; concurrent tasks...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Oct 2008

    Enabling Lock-Free Concurrent Fine-Grain Access to Massive Distributed Data: Application to Supernovae Detection

    The authors consider the problem of efficiently managing massive data in a large-scale distributed environment. They consider data strings of size in the order of Terabytes, shared and accessed by concurrent clients. On each individual access, a segment of a string, of the order of Megabytes, is read or modified....

    Provided By University of Reims Champagne Ardenne

  • White Papers // Oct 2008

    Distributed Management of Massive Data: an Efficient Fine-Grain Data Access Scheme

    In this paper, the authors addresses the problem of efficiently storing and accessing massive data blocks in a large-scale distributed environment, while providing efficient fine-grain access to data subsets. This issue is crucial in the context of applications in the field of databases, data mining and multimedia. They propose a...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Aug 2013

    ReqFlex: Fuzzy Queries for Everyone

    The last decade has witnessed an increasing interest in expressing preferences inside DataBase (DB) queries. As a matter of fact, the first research works on this topic date back to the late 80s, see for instance. Motivations for such a concern are manifold. It has appeared to be desirable to...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Sep 2013

    Security Amplification Against Meet-in-the-Middle Attacks Using Whitening

    In this paper the authors introduce a model for studying meet-in-the-middle attacks on block ciphers, and a simple block cipher construction provably resistant to such attacks in this model. A side-result of this is a proper formalization for an unproven alternative to DESX proposed by the researcher; this construction can...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Aug 2009

    A Quality-Centric Data Model for Distributed Stream Management Systems

    It is challenging for large-scale stream management systems to return always perfect results when processing data streams originating from distributed sources. Data sources and intermediate processing nodes may fail during the lifetime of a stream query. In addition, individual nodes may become overloaded due to processing demands. In practice, users...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Jan 2010

    PowWow : Power Optimized Hardware/Software Framework for Wireless Motes

    An energy-efficient platform for wireless sensor networks and its dedicated software framework are described and optimizations are proposed at both hardware and software level. The hardware is based on low cost and low power components linked in a multilayer architecture. Some processing, such as error correcting codes is accelerated by...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Jul 2012

    A Unified Hardware/software Co-Synthesis Solution for Signal Processing Systems

    In this paper, the authors present a methodology to specify from a high-level data-flow description an application for both hardware and software synthesis. An introduction to RVC-CAL data-flow programming and Orcc framework is presented. Furthermore, an analysis of a close to gate intermediate representation (XLIM) is bestowed. As a proof...

    Provided By University of Reims Champagne Ardenne

  • White Papers // Jan 2014

    Autoscaling Web Applications in Heterogeneous Cloud Infrastructures

    Improving resource provisioning of heterogeneous cloud infrastructures is an important research challenge. The wide diversity of cloud-based applications and customers with different QoS requirements has recently exhibited the weaknesses of current provisioning systems. Today's cloud infrastructures provide provisioning systems that dynamically adapt the computational power of applications by adding or...

    Provided By University of Reims Champagne Ardenne