Universidade do Algarve

Displaying 1-15 of 15 results

  • White Papers // Oct 2013

    Last-Level Cache Interference-Aware Scheduling in Scientific Clouds

    Cloud infrastructures are increasingly being adopted in different purposes, like business applications and scientific experiments. Relying in virtualization, it addresses several advantages such as resource consolidation and improved management of entire infrastructure, leading to opportunity to reduce costs associated with power consumption and acquisition of new hardware. However, consolidation of...

    Provided By Universidade do Algarve

  • White Papers // May 2012

    Codes and Balances: Multibeam Satellite Load Balancing With Coded Packets

    Aiming to exploit the capabilities of next generation terminals to receive and process several, partially overlapping beams of a multi-beam satellite, the authors present a mathematical analysis and propose algorithms to provide enhanced and robust load-balancing to unequal load demands between beams. At the core of their mechanisms is a...

    Provided By Universidade do Algarve

  • White Papers // Apr 2012

    Cloud2Bubble: Enhancing Quality of Experience in Mobile Cloud Computing Settings

    In recent years the mass adoption of mobile devices and increasingly ubiquitous connectivity has contributed to a radical change in the way people interact with computer systems. Moreover cloud computing infrastructures have paved the way for the development of smart systems in such settings, whose goal is to provide a...

    Provided By Universidade do Algarve

  • White Papers // Mar 2012

    Using Data Mining to Study the Impact of Topology Characteristics on the Performance of Wireless Mesh Networks

    This paper quantifies the impact of topological characteristics on the performance of single radio multichannel IEEE 802.11 mesh networks. Topological characteristics are the number of nodes per sub-network, the hop count, the neighbor node density, the hidden nodes, the number of nodes in the neighborhood of the gateway, and the...

    Provided By Universidade do Algarve

  • White Papers // Feb 2012

    Hide and Code: Session Anonymity in Wireless Line Networks with Coded Packets

    The broadcast nature of the communication channel enables a malicious eavesdropper to gain information about connectivity and active sessions in a multi-hop wireless network. This can be achieved simply by overhearing the transmitted signals over the ether and analyzing their timings. Focusing on techniques that can meet information-theoretic criteria for...

    Provided By Universidade do Algarve

  • White Papers // Sep 2011

    Informed Network Coding for Minimum Decoding Delay

    Network coding is a highly efficient data dissemination mechanism for wireless networks. Since network coded information can only be recovered after delivering a sufficient number of coded packets, the resulting decoding delay can become problematic for delay-sensitive applications such as real-time media streaming. Motivated by this observation, the authors consider...

    Provided By Universidade do Algarve

  • White Papers // Jul 2011

    Fast prototyping of Network Protocols Through ns-3 Simulation Model Reuse

    In the networking research and development field, one recurring problem faced is the duplication of effort to write first simulation and then implementation code. The authors posit an alternative development process that takes advantage of the built-in network emulation features of network simulator 3 (ns-3) and allows developers to share...

    Provided By Universidade do Algarve

  • White Papers // May 2011

    Joint Source-Network Coding for Large-Scale Sensor Networks

    A modular system architecture based on separate compression and network coding is known to be theoretically suboptimal for relevant classes of sensor networks with correlated sources. Motivated by this observation, the authors present a feasible solution for joint source and network coding with distortion constraints. By choosing encoders that are...

    Provided By Universidade do Algarve

  • White Papers // Jul 2010

    Social Security And Economic Performance In Portugal: After All That Has Been Said And Done How Much Has Actually Changed?

    This paper provides an empirical estimate of the macroeconomic effects of the Portuguese pay-as-you-go social security system based on data for the period 1970-2007 and on VAR estimates using GDP, the unit cost of labor, the unemployment rate, the savings rate and social security spending. The major findings are twofold....

    Provided By Universidade do Algarve

  • White Papers // May 2010

    WiMetroNet - A Scalable Wireless Network for Metropolitan Transports

    In this paper, the authors address a class of moving or vehicle-to-infrastructure networks. Their particular network - the WiMetroNet - is a private network possibly owned by a consortium of companies which jointly operate public transportation vehicles such as buses, trams, and taxis. The scenario addressed consists of providing secure...

    Provided By Universidade do Algarve

  • White Papers // Jan 2010

    Network Coding Delay: A Brute-Force Analysis

    Understanding the delay behavior of network coding with a fixed number of receivers, small field sizes and a limited number of encoded symbols is a key step towards its applicability in real-time communication systems with stringent delay constraints. Previous results are typically asymptotic in nature and focus mainly on the...

    Provided By Universidade do Algarve

  • White Papers // Jan 2009

    A New Efficient Mechanism for Establishing IP Connectivity Between Ambient Networks

    The changes in the communication paradigm envisioned for future networks, with peer-to-peer/symmetric attachments gaining momentum and two IP (Internet Protocol) versions coexisting, will pose new challenges to mobile communication networks. Traditional IP auto-configuration mechanisms will not work properly, since they were designed mostly having in mind a client-server/asymmetric attachment model,...

    Provided By Universidade do Algarve

  • White Papers // Jan 2009

    Multi-Radio Hybrid Wireless-Optical Broadband Access Networks

    The Wireless-Optical Broadband-Access Network (WOBAN) architecture has been proposed as a flexible solution to meet the ever-demanding needs in access networks. At the wireless front-end multi-channel communication, with routers having multiple radio interfaces tuned to non-overlapping channels, can be used to improve network throughput in a cost-effective way. This paper...

    Provided By Universidade do Algarve

  • White Papers // Jan 2009

    Network Coding Multicast in Satellite Networks

    The broadcast nature of satellite communications provides a highly effective medium for content distribution, especially in the case of geographically scattered clients. In satellite networks such as DVB-RCS based systems, new approaches and further improvements in content distribution are possible. Non-real-time applications typically employ reliable multicast methods, based on application...

    Provided By Universidade do Algarve

  • White Papers // Oct 2008

    Edge-Node Deployed Routing Strategies for Load Balancing in Optical Burst Switched Networks

    Optical Burst Switching is a promising switching paradigm for the next IP over optical network backbones. However its burst loss performance is highly affected by burst contention. Several methods have been proposed to address this problem, some of them requiring the network to be flooded by frequent state dissemination signaling...

    Provided By Universidade do Algarve

  • White Papers // Jan 2009

    A New Efficient Mechanism for Establishing IP Connectivity Between Ambient Networks

    The changes in the communication paradigm envisioned for future networks, with peer-to-peer/symmetric attachments gaining momentum and two IP (Internet Protocol) versions coexisting, will pose new challenges to mobile communication networks. Traditional IP auto-configuration mechanisms will not work properly, since they were designed mostly having in mind a client-server/asymmetric attachment model,...

    Provided By Universidade do Algarve

  • White Papers // May 2010

    WiMetroNet - A Scalable Wireless Network for Metropolitan Transports

    In this paper, the authors address a class of moving or vehicle-to-infrastructure networks. Their particular network - the WiMetroNet - is a private network possibly owned by a consortium of companies which jointly operate public transportation vehicles such as buses, trams, and taxis. The scenario addressed consists of providing secure...

    Provided By Universidade do Algarve

  • White Papers // Sep 2011

    Informed Network Coding for Minimum Decoding Delay

    Network coding is a highly efficient data dissemination mechanism for wireless networks. Since network coded information can only be recovered after delivering a sufficient number of coded packets, the resulting decoding delay can become problematic for delay-sensitive applications such as real-time media streaming. Motivated by this observation, the authors consider...

    Provided By Universidade do Algarve

  • White Papers // Feb 2012

    Hide and Code: Session Anonymity in Wireless Line Networks with Coded Packets

    The broadcast nature of the communication channel enables a malicious eavesdropper to gain information about connectivity and active sessions in a multi-hop wireless network. This can be achieved simply by overhearing the transmitted signals over the ether and analyzing their timings. Focusing on techniques that can meet information-theoretic criteria for...

    Provided By Universidade do Algarve

  • White Papers // May 2011

    Joint Source-Network Coding for Large-Scale Sensor Networks

    A modular system architecture based on separate compression and network coding is known to be theoretically suboptimal for relevant classes of sensor networks with correlated sources. Motivated by this observation, the authors present a feasible solution for joint source and network coding with distortion constraints. By choosing encoders that are...

    Provided By Universidade do Algarve

  • White Papers // Apr 2012

    Cloud2Bubble: Enhancing Quality of Experience in Mobile Cloud Computing Settings

    In recent years the mass adoption of mobile devices and increasingly ubiquitous connectivity has contributed to a radical change in the way people interact with computer systems. Moreover cloud computing infrastructures have paved the way for the development of smart systems in such settings, whose goal is to provide a...

    Provided By Universidade do Algarve

  • White Papers // Jan 2010

    Network Coding Delay: A Brute-Force Analysis

    Understanding the delay behavior of network coding with a fixed number of receivers, small field sizes and a limited number of encoded symbols is a key step towards its applicability in real-time communication systems with stringent delay constraints. Previous results are typically asymptotic in nature and focus mainly on the...

    Provided By Universidade do Algarve

  • White Papers // Jan 2009

    Network Coding Multicast in Satellite Networks

    The broadcast nature of satellite communications provides a highly effective medium for content distribution, especially in the case of geographically scattered clients. In satellite networks such as DVB-RCS based systems, new approaches and further improvements in content distribution are possible. Non-real-time applications typically employ reliable multicast methods, based on application...

    Provided By Universidade do Algarve

  • White Papers // Jul 2011

    Fast prototyping of Network Protocols Through ns-3 Simulation Model Reuse

    In the networking research and development field, one recurring problem faced is the duplication of effort to write first simulation and then implementation code. The authors posit an alternative development process that takes advantage of the built-in network emulation features of network simulator 3 (ns-3) and allows developers to share...

    Provided By Universidade do Algarve

  • White Papers // Oct 2013

    Last-Level Cache Interference-Aware Scheduling in Scientific Clouds

    Cloud infrastructures are increasingly being adopted in different purposes, like business applications and scientific experiments. Relying in virtualization, it addresses several advantages such as resource consolidation and improved management of entire infrastructure, leading to opportunity to reduce costs associated with power consumption and acquisition of new hardware. However, consolidation of...

    Provided By Universidade do Algarve

  • White Papers // Jan 2009

    Multi-Radio Hybrid Wireless-Optical Broadband Access Networks

    The Wireless-Optical Broadband-Access Network (WOBAN) architecture has been proposed as a flexible solution to meet the ever-demanding needs in access networks. At the wireless front-end multi-channel communication, with routers having multiple radio interfaces tuned to non-overlapping channels, can be used to improve network throughput in a cost-effective way. This paper...

    Provided By Universidade do Algarve

  • White Papers // Jul 2010

    Social Security And Economic Performance In Portugal: After All That Has Been Said And Done How Much Has Actually Changed?

    This paper provides an empirical estimate of the macroeconomic effects of the Portuguese pay-as-you-go social security system based on data for the period 1970-2007 and on VAR estimates using GDP, the unit cost of labor, the unemployment rate, the savings rate and social security spending. The major findings are twofold....

    Provided By Universidade do Algarve

  • White Papers // Oct 2008

    Edge-Node Deployed Routing Strategies for Load Balancing in Optical Burst Switched Networks

    Optical Burst Switching is a promising switching paradigm for the next IP over optical network backbones. However its burst loss performance is highly affected by burst contention. Several methods have been proposed to address this problem, some of them requiring the network to be flooded by frequent state dissemination signaling...

    Provided By Universidade do Algarve

  • White Papers // May 2012

    Codes and Balances: Multibeam Satellite Load Balancing With Coded Packets

    Aiming to exploit the capabilities of next generation terminals to receive and process several, partially overlapping beams of a multi-beam satellite, the authors present a mathematical analysis and propose algorithms to provide enhanced and robust load-balancing to unequal load demands between beams. At the core of their mechanisms is a...

    Provided By Universidade do Algarve

  • White Papers // Mar 2012

    Using Data Mining to Study the Impact of Topology Characteristics on the Performance of Wireless Mesh Networks

    This paper quantifies the impact of topological characteristics on the performance of single radio multichannel IEEE 802.11 mesh networks. Topological characteristics are the number of nodes per sub-network, the hop count, the neighbor node density, the hidden nodes, the number of nodes in the neighborhood of the gateway, and the...

    Provided By Universidade do Algarve