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Technical University of Catalonia
(29 results)-
White Papers
An Efficient Method for Service Level Agreement Assessment
June 4, 2009, 12:00am PDT
On-line end-to-end Service Level Agreement (SLA) monitoring is of key importance nowadays. For this purpose, recent researches have focused on measuring (when possible), or estimating (most of the...
Provided by Technical University of Catalonia
-
White Papers
Efficient Data Management Support for Virtualized Service Providers
November 6, 2008, 12:00am PST
Virtualization has been lately introduced for supporting and simplifying service providers' management with promising results. Nevertheless, using virtualization introduces also new challenges...
Provided by Technical University of Catalonia
-
White Papers
Performance of Translucent Optical Networks Under Dynamic Traffic and Uncertain Physical-Layer Information
April 12, 2010, 12:00am PDT
This paper investigates the performance of translucent Optical Transport Networks (OTNs) under different traffic and knowledge conditions, varying from perfect knowledge to drifts and...
Provided by Technical University of Catalonia
-
White Papers
Toward Business-Driven Risk Management for Cloud Computing
September 1, 2010, 12:00am PDT
The Cloud computing paradigm is offering an innovative and promising vision concerning the Information and Communications Technology (ICT). Actually, it gives the possibility of improving IT...
Provided by Technical University of Catalonia
-
White Papers
Analysing the Overhead in Mobile Ad-Hoc Network With a Hierarchical Routing Structure
January 1, 2010, 12:00am PST
Hierarchical routing is a common practice in actual Internet networks. This kind of routing allows nodes and routers to get small routing tables and small routing overhead. On the opposite side,...
Provided by Technical University of Catalonia
-
White Papers
Using Filesystem Virtualization to Avoid Metadata Bottlenecks
December 9, 2009, 12:00am PST
Parallel file systems are very sensitive to adverse conditions and the lack of synergy between such file systems and some of the applications running on them have a negative impact on the overall...
Provided by Technical University of Catalonia
-
White Papers
Tailoring Resources: The Energy Efficient Consolidation Strategy Goes Beyond Virtualization
December 15, 2007, 12:00am PST
Virtualization and consolidation are two complementary techniques widely adopted in a global strategy to reduce system management complexity. This paper shows how two simple and well-known...
Provided by Technical University of Catalonia
-
White Papers
Content-Based Image Retrieval as a Web Service
February 16, 2010, 12:00am PST
This paper presents the design and implementation of a Content-Based Image Retrieval system where queries are formulated by visual examples through a graphical interface and content can be...
Provided by Technical University of Catalonia
-
White Papers
Modeling Physical-Layer Impairments in Multi-Domain Optical Networks
December 29, 2010, 12:00am PST
The advantages of optical transparency are still confined to the boundaries of a domain, since the optical signals are subject to O/E/O conversions at the border nodes that separate two optical...
Provided by Technical University of Catalonia
-
White Papers
A Genetic Model for Pricing in Cloud Computing Markets
April 1, 2011, 12:00am PDT
Cloud Computing markets arise as an efficient way to allocate resources for the execution of tasks and services within a set of geographically dispersed providers from different organisations....
Provided by Technical University of Catalonia
-
White Papers
A Multiple Dimension Slotting Approach for Virtualized Resource Management
March 19, 2007, 12:00am PDT
Recent advances in virtualization technologies can be applied to different research areas, such as virtualized resource management in High Performance Computing (HPC) Grid. On the one hand, the...
Provided by Technical University of Catalonia
-
White Papers
Building Tools for Model Driven Development: Comparing Microsoft DSL Tools and Eclipse Modeling Plug-Ins
September 28, 2006, 12:00am PDT
The development and wide adoption of CASE Tools that provide Code Generation from Models is one critical requirement to confirm the success of the Model Driven Software Development (MDSD). Main...
Provided by Technical University of Catalonia
-
White Papers
An Interoperability System for Authentication and Authorization in VANETs
February 9, 2009, 12:00am PST
Vehicular Ad-Hoc NETworks (VANETs) have evolved considerably over the last years, promising to drastically reduce the number of traffic victims by increasing the overall road safety. Despite the...
Provided by Technical University of Catalonia
-
White Papers
Batch Job Profiling and Adaptive Profile Enforcement for Virtualized Environments
November 28, 2008, 12:00am PST
Data center management is driven by high-level performance goals, and it is the responsibility of a management middleware to ensure that those goals are met using dynamic resource allocation. The...
Provided by Technical University of Catalonia
-
White Papers
Experiences With Virtual Machine Profiling for Batch Jobs in Real Systems
January 3, 2009, 12:00am PST
In this paper, the authors have summarized the experiences in the process not only of generating workload profiles for resource provisioning but also in the process of enforcing resource profiles...
Provided by Technical University of Catalonia
-
White Papers
Wireless Network Delay Estimation for Time-Sensitive Applications
July 27, 2006, 12:00am PDT
Wireless Local Area Networks (WLANs) based on 802.11b technology (commercially known as WiFi) have become, in the last few years, quite popular and widespread. The nature of the radio channel and...
Provided by Technical University of Catalonia
-
White Papers
Self-Triggered Networked Control Systems: An Experimental Case Study
December 10, 2009, 12:00am PST
A self-triggered controller is characterized, in general, by a non-periodic sequence of job activations. And each job execution, apart from performing sampling, control algorithm computation and...
Provided by Technical University of Catalonia
-
White Papers
Preliminary Approach to Lyapunov Sampling in CAN-Based Networked Control Systems
July 27, 2009, 12:00am PDT
This paper presents a preliminary approach to Networked Control Systems (NCSs) that relies on an event-driven control method based on Lyapunov sampling. The goal is to study and develop approaches...
Provided by Technical University of Catalonia
-
White Papers
Analysis and Design of Networked Control Loops With Synchronization at the Actuation Instants
April 30, 2008, 12:00am PDT
Varying time delays prevent successful operation of control loops closed over communication networks, i.e. Networked Control System (NCS). To mitigate the negative effects of delays, existing...
Provided by Technical University of Catalonia
-
White Papers
Towards Energy Saving Wireless Body Sensor Networks in Health Care Systems
July 2, 2010, 12:00am PDT
The fact that the IEEE 802.15.4 MAC does not fully satisfy the strict wireless Body Sensor Network (BSN) requirements in healthcare systems highlights the need for the design of new scalable MAC...
Provided by Technical University of Catalonia
-
White Papers
Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks
March 13, 2009, 12:00am PDT
Transparent optical networks are the enabling infrastructure for converged multi-granular networks in the Future Internet. The cross-layer planning of these networks considers physical impairments...
Provided by Technical University of Catalonia
-
White Papers
Activity-Related Biometric Authentication
August 29, 2008, 12:00am PDT
This project aims at developing a biometric authentication system exploiting new features extracted by analyzing the dynamic nature of various modalities, including motion analysis during ordinary...
Provided by Technical University of Catalonia
-
White Papers
The Internet and Transport Network Management Ecosystems: A Roadmap Toward Convergence
February 27, 2012, 12:00am PST
For many years, the convergence of IP data services and transport network services based on optical transmission has been at the heart of carriers' investments and business strategies. However,...
Provided by Technical University of Catalonia
-
White Papers
An Adaptive Solution for Wireless LAN Distributed Power Saving Modes
March 16, 2009, 12:00am PDT
The current trend to incorporate the Wireless LAN technology in increasingly smaller mobile devices poses new challenges, in terms of QoS and power consumption requirements, for the design of such...
Provided by Technical University of Catalonia
-
White Papers
Analysis of Path-Vector Routing Stability
April 25, 2012, 12:00am PDT
Most studies on path-vector routing stability have been conducted empirically by means of ad-hoc analysis of BGP data traces. None of them consider prior specification of an analytic method...
Provided by Technical University of Catalonia
-
White Papers
J2EE Instrumentation for Software Aging Root Cause Application Component Determination With AspectJ
December 23, 2009, 12:00am PST
Unplanned system outages have a negative impact on company revenues and image. While the last decades have seen a lot of efforts from industry and academia to avoid them, they still happen and...
Provided by Technical University of Catalonia
-
White Papers
Maximum Coverage at Minimum Cost for Multi-Domain IP/MPLS Networks
January 14, 2008, 12:00am PST
At present, service providers have several incentives to extend the reach of long-lived MPLS paths across domains. Providers, however, will face a number of trade-offs while choosing the optimal...
Provided by Technical University of Catalonia
-
White Papers
Mechanism for Per-Class QoS Monitoring in IP/MPLS Transport Networks
January 28, 2009, 12:00am PST
This paper presents a study on the usage of MPLS as the technology for transport networks which have to be sensitive to IP Differentiated Services. Advantages of MPLS for implementing Traffic...
Provided by Technical University of Catalonia
-
White Papers
Achievable Bandwidth Estimation for Stations in Multi-Rate IEEE 802.11 WLAN Cells
June 18, 2008, 12:00am PDT
This paper analyzes the effect of multi-rate transmissions in a CSMA wireless LAN environment. Observations in a real testbed showed that bandwidth resources (in Bytes/s) are shared fairly among...
Provided by Technical University of Catalonia
-
White Papers
J2EE Instrumentation for Software Aging Root Cause Application Component Determination With AspectJ
December 23, 2009, 12:00am PST
Unplanned system outages have a negative impact on company revenues and image. While the last decades have seen a lot of efforts from industry and academia to avoid them, they still happen and...
Provided by Technical University of Catalonia
-
White Papers
Analysis of Path-Vector Routing Stability
April 25, 2012, 12:00am PDT
Most studies on path-vector routing stability have been conducted empirically by means of ad-hoc analysis of BGP data traces. None of them consider prior specification of an analytic method...
Provided by Technical University of Catalonia
-
White Papers
An Adaptive Solution for Wireless LAN Distributed Power Saving Modes
March 16, 2009, 12:00am PDT
The current trend to incorporate the Wireless LAN technology in increasingly smaller mobile devices poses new challenges, in terms of QoS and power consumption requirements, for the design of such...
Provided by Technical University of Catalonia
-
White Papers
The Internet and Transport Network Management Ecosystems: A Roadmap Toward Convergence
February 27, 2012, 12:00am PST
For many years, the convergence of IP data services and transport network services based on optical transmission has been at the heart of carriers' investments and business strategies. However,...
Provided by Technical University of Catalonia
-
White Papers
Activity-Related Biometric Authentication
August 29, 2008, 12:00am PDT
This project aims at developing a biometric authentication system exploiting new features extracted by analyzing the dynamic nature of various modalities, including motion analysis during ordinary...
Provided by Technical University of Catalonia
-
White Papers
Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks
March 13, 2009, 12:00am PDT
Transparent optical networks are the enabling infrastructure for converged multi-granular networks in the Future Internet. The cross-layer planning of these networks considers physical impairments...
Provided by Technical University of Catalonia
-
White Papers
Towards Energy Saving Wireless Body Sensor Networks in Health Care Systems
July 2, 2010, 12:00am PDT
The fact that the IEEE 802.15.4 MAC does not fully satisfy the strict wireless Body Sensor Network (BSN) requirements in healthcare systems highlights the need for the design of new scalable MAC...
Provided by Technical University of Catalonia
-
White Papers
Analysis and Design of Networked Control Loops With Synchronization at the Actuation Instants
April 30, 2008, 12:00am PDT
Varying time delays prevent successful operation of control loops closed over communication networks, i.e. Networked Control System (NCS). To mitigate the negative effects of delays, existing...
Provided by Technical University of Catalonia
-
White Papers
Preliminary Approach to Lyapunov Sampling in CAN-Based Networked Control Systems
July 27, 2009, 12:00am PDT
This paper presents a preliminary approach to Networked Control Systems (NCSs) that relies on an event-driven control method based on Lyapunov sampling. The goal is to study and develop approaches...
Provided by Technical University of Catalonia
-
White Papers
Self-Triggered Networked Control Systems: An Experimental Case Study
December 10, 2009, 12:00am PST
A self-triggered controller is characterized, in general, by a non-periodic sequence of job activations. And each job execution, apart from performing sampling, control algorithm computation and...
Provided by Technical University of Catalonia
-
White Papers
Wireless Network Delay Estimation for Time-Sensitive Applications
July 27, 2006, 12:00am PDT
Wireless Local Area Networks (WLANs) based on 802.11b technology (commercially known as WiFi) have become, in the last few years, quite popular and widespread. The nature of the radio channel and...
Provided by Technical University of Catalonia
-
White Papers
Experiences With Virtual Machine Profiling for Batch Jobs in Real Systems
January 3, 2009, 12:00am PST
In this paper, the authors have summarized the experiences in the process not only of generating workload profiles for resource provisioning but also in the process of enforcing resource profiles...
Provided by Technical University of Catalonia
-
White Papers
Batch Job Profiling and Adaptive Profile Enforcement for Virtualized Environments
November 28, 2008, 12:00am PST
Data center management is driven by high-level performance goals, and it is the responsibility of a management middleware to ensure that those goals are met using dynamic resource allocation. The...
Provided by Technical University of Catalonia
-
White Papers
An Interoperability System for Authentication and Authorization in VANETs
February 9, 2009, 12:00am PST
Vehicular Ad-Hoc NETworks (VANETs) have evolved considerably over the last years, promising to drastically reduce the number of traffic victims by increasing the overall road safety. Despite the...
Provided by Technical University of Catalonia
-
White Papers
A Multiple Dimension Slotting Approach for Virtualized Resource Management
March 19, 2007, 12:00am PDT
Recent advances in virtualization technologies can be applied to different research areas, such as virtualized resource management in High Performance Computing (HPC) Grid. On the one hand, the...
Provided by Technical University of Catalonia
-
White Papers
A Genetic Model for Pricing in Cloud Computing Markets
April 1, 2011, 12:00am PDT
Cloud Computing markets arise as an efficient way to allocate resources for the execution of tasks and services within a set of geographically dispersed providers from different organisations....
Provided by Technical University of Catalonia
-
White Papers
Modeling Physical-Layer Impairments in Multi-Domain Optical Networks
December 29, 2010, 12:00am PST
The advantages of optical transparency are still confined to the boundaries of a domain, since the optical signals are subject to O/E/O conversions at the border nodes that separate two optical...
Provided by Technical University of Catalonia
-
White Papers
Content-Based Image Retrieval as a Web Service
February 16, 2010, 12:00am PST
This paper presents the design and implementation of a Content-Based Image Retrieval system where queries are formulated by visual examples through a graphical interface and content can be...
Provided by Technical University of Catalonia
-
White Papers
Tailoring Resources: The Energy Efficient Consolidation Strategy Goes Beyond Virtualization
December 15, 2007, 12:00am PST
Virtualization and consolidation are two complementary techniques widely adopted in a global strategy to reduce system management complexity. This paper shows how two simple and well-known...
Provided by Technical University of Catalonia
-
White Papers
Using Filesystem Virtualization to Avoid Metadata Bottlenecks
December 9, 2009, 12:00am PST
Parallel file systems are very sensitive to adverse conditions and the lack of synergy between such file systems and some of the applications running on them have a negative impact on the overall...
Provided by Technical University of Catalonia
-
White Papers
Analysing the Overhead in Mobile Ad-Hoc Network With a Hierarchical Routing Structure
January 1, 2010, 12:00am PST
Hierarchical routing is a common practice in actual Internet networks. This kind of routing allows nodes and routers to get small routing tables and small routing overhead. On the opposite side,...
Provided by Technical University of Catalonia
-
White Papers
Toward Business-Driven Risk Management for Cloud Computing
September 1, 2010, 12:00am PDT
The Cloud computing paradigm is offering an innovative and promising vision concerning the Information and Communications Technology (ICT). Actually, it gives the possibility of improving IT...
Provided by Technical University of Catalonia
-
White Papers
Performance of Translucent Optical Networks Under Dynamic Traffic and Uncertain Physical-Layer Information
April 12, 2010, 12:00am PDT
This paper investigates the performance of translucent Optical Transport Networks (OTNs) under different traffic and knowledge conditions, varying from perfect knowledge to drifts and...
Provided by Technical University of Catalonia
-
White Papers
Efficient Data Management Support for Virtualized Service Providers
November 6, 2008, 12:00am PST
Virtualization has been lately introduced for supporting and simplifying service providers' management with promising results. Nevertheless, using virtualization introduces also new challenges...
Provided by Technical University of Catalonia
-
White Papers
An Efficient Method for Service Level Agreement Assessment
June 4, 2009, 12:00am PDT
On-line end-to-end Service Level Agreement (SLA) monitoring is of key importance nowadays. For this purpose, recent researches have focused on measuring (when possible), or estimating (most of the...
Provided by Technical University of Catalonia
-
White Papers
Achievable Bandwidth Estimation for Stations in Multi-Rate IEEE 802.11 WLAN Cells
June 18, 2008, 12:00am PDT
This paper analyzes the effect of multi-rate transmissions in a CSMA wireless LAN environment. Observations in a real testbed showed that bandwidth resources (in Bytes/s) are shared fairly among...
Provided by Technical University of Catalonia
-
White Papers
Mechanism for Per-Class QoS Monitoring in IP/MPLS Transport Networks
January 28, 2009, 12:00am PST
This paper presents a study on the usage of MPLS as the technology for transport networks which have to be sensitive to IP Differentiated Services. Advantages of MPLS for implementing Traffic...
Provided by Technical University of Catalonia
-
White Papers
Maximum Coverage at Minimum Cost for Multi-Domain IP/MPLS Networks
January 14, 2008, 12:00am PST
At present, service providers have several incentives to extend the reach of long-lived MPLS paths across domains. Providers, however, will face a number of trade-offs while choosing the optimal...
Provided by Technical University of Catalonia
-
White Papers
Building Tools for Model Driven Development: Comparing Microsoft DSL Tools and Eclipse Modeling Plug-Ins
September 28, 2006, 12:00am PDT
The development and wide adoption of CASE Tools that provide Code Generation from Models is one critical requirement to confirm the success of the Model Driven Software Development (MDSD). Main...
Provided by Technical University of Catalonia
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