Technical University of Catalonia

Displaying 1-30 of 30 results

  • White Papers // Dec 2012

    Body Sensors and Healthcare Monitoring - Design and Optimization of a Wireless Communication Protocol

    The aging population and the high expectations towards quality of life in user's society lead to the need of more efficient and affordable medical systems and monitoring solutions. The development of wireless Body Sensor Networks (BSNs) offers a platform to establish such a healthcare monitoring systems. However, BSNs in the...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2012

    Analysis of Path-Vector Routing Stability

    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 including the use of stability measurement metrics for the systematic analysis of BGP traces and associated meta-processing for determining the local...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2012

    The Internet and Transport Network Management Ecosystems: A Roadmap Toward Convergence

    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, significant challenges still remain. Over time, the inherent technological differences between the IP and transport networks have deeply segmented their operation,...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2012

    Green Distance-Aware Base Station Sleeping Algorithm in LTE-Advanced

    In this paper, the authors propose a switch on/off algorithm for Base Stations (BSs), which exploits the knowledge of the distance between the User Equipments (UEs) and their associated BS. Their novel approach hopes to provide an improvement to the problem of energy consumption. The major concern lies on reducing...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2012

    Stability Analysis of Path-Vector Routing

    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 including the use of stability measurement metrics for the systematic analysis of BGP traces and associated meta-processing for determining the local...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2011

    A Genetic Model for Pricing in Cloud Computing Markets

    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. Client applications and service providers meet in a market and negotiate for the sales of services by means of the signature of...

    Provided By Technical University of Catalonia

  • White Papers // Mar 2011

    Coaxial Narrowband Filters Using a Versatile Suspended Resonator

    In this paper, two four-pole filters at X-band are presented, both designs use a coaxial quarter wavelength resonator suspended in air by short circuits between the coaxial center and outer conductor. Different couplings between suspended resonators have been used to obtain a Chebyshev and a quasi-elliptic response. The Chebyshev filter...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2011

    Energy-Efficiency Analysis of a Distributed Queuing Medium Access Control Protocol for Biomedical Wireless Sensor Networks in Saturation Conditions

    The aging population and the high quality of life expectations in the society lead to the need of more efficient and affordable healthcare solutions. For this reason, this paper aims for the optimization of Medium Access Control (MAC) protocols for biomedical wireless sensor networks or wireless Body Sensor Networks (BSNs)....

    Provided By Technical University of Catalonia

  • White Papers // Dec 2010

    Modeling Physical-Layer Impairments in Multi-Domain Optical Networks

    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 domains. The extension of transparent connections across domains requires advances both in the modeling of the impairments suffered by...

    Provided By Technical University of Catalonia

  • White Papers // Sep 2010

    Toward Business-Driven Risk Management for Cloud Computing

    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 systems management and is changing the way in which hardware and software are designed and purchased. Not withstanding, the use of Cloud resources, which...

    Provided By Technical University of Catalonia

  • White Papers // Jul 2010

    Towards Energy Saving Wireless Body Sensor Networks in Health Care Systems

    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 solutions, which guarantee low-power consumption to all specific sorts of body sensors and traffic loads. While taking the...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2010

    Performance of Translucent Optical Networks Under Dynamic Traffic and Uncertain Physical-Layer Information

    This paper investigates the performance of translucent Optical Transport Networks (OTNs) under different traffic and knowledge conditions, varying from perfect knowledge to drifts and uncertainties in the physical-layer parameters. The focus is on the regular operation of a translucent OTN, i.e., after the dimensioning and regenerator placement phase. The contributions...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2010

    Content-Based Image Retrieval as a Web Service

    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 remotely accessed through web services. Visual descriptors and similarity measures implemented in this work are mostly defined in the MPEG-7 standard, while...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2010

    Analysing the Overhead in Mobile Ad-Hoc Network With a Hierarchical Routing Structure

    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, routing in MANETs is flat; therefore, nodes have to learn how to reach each node in the network. It...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2009

    J2EE Instrumentation for Software Aging Root Cause Application Component Determination With AspectJ

    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 their impact is increasing. According to many studies, one of the most important causes of these outages...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2009

    Self-Triggered Networked Control Systems: An Experimental Case Study

    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 actuation, calculates the next job activation time as a function of the plant state. This paper describes the implementation of self-triggered controllers in Networked...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2009

    Using Filesystem Virtualization to Avoid Metadata Bottlenecks

    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 system performance. The observations indicate that the increased pressure on metadata management is one of the relevant...

    Provided By Technical University of Catalonia

  • White Papers // Jul 2009

    Preliminary Approach to Lyapunov Sampling in CAN-Based Networked Control Systems

    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 for NCS capable of offering controllers with low bandwidth demands. The paper starts by presenting the theoretical framework required for...

    Provided By Technical University of Catalonia

  • White Papers // Jun 2009

    An Efficient Method for Service Level Agreement Assessment

    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 times) network Quality of Service (QoS) and performance parameters. Up to now, all the proposed solutions have the drawback of requiring a...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2009

    Any Traffic Routing Algorithm for Label-Based Forwarding

    The high capacity provided by packet-switched networks is supporting the proliferation of bandwidth intensive multimedia applications which require multicasting capability. As a consequence a mixed traffic scenario where both unicast and multicast demands compete for the same shared resources, is the one more likely to be found within the current...

    Provided By Technical University of Catalonia

  • White Papers // Mar 2009

    An Adaptive Solution for Wireless LAN Distributed Power Saving Modes

    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 devices. IEEE 802.11 and 802.11e define mechanisms to address these challenges but do not provide any guidance about how to...

    Provided By Technical University of Catalonia

  • White Papers // Mar 2009

    Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks

    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 in the network layer design. This is complicated by the diversity of modulation formats, transmission rates, amplification and compensation equipments, or deployed fiber links. Thereby, the...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2009

    An Interoperability System for Authentication and Authorization in VANETs

    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 wide number of potential applications VANETs also raise a broad range of critical security challenges mostly related with Privacy, which remains as...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2009

    Mechanism for Per-Class QoS Monitoring in IP/MPLS Transport Networks

    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 Engineering and the capabilities that lead it towards integration with IP-DiffServ are discussed. Several solutions for DS-TE MPLS are...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2009

    Experiences With Virtual Machine Profiling for Batch Jobs in Real Systems

    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 in real systems. The focus of the paper is put in the provisioning of resources for clusters of virtual machines...

    Provided By Technical University of Catalonia

  • White Papers // Nov 2008

    Batch Job Profiling and Adaptive Profile Enforcement for Virtualized Environments

    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 performance delivered by the heterogeneous set of applications running in a virtualized enterprise data center must be predicted to make...

    Provided By Technical University of Catalonia

  • White Papers // Nov 2008

    Efficient Data Management Support for Virtualized Service Providers

    Virtualization has been lately introduced for supporting and simplifying service providers' management with promising results. Nevertheless, using virtualization introduces also new challenges that must be considered. One of them relates with the data management in the provider. This paper proposes an innovative approach for performing efficiently all the data-related processes...

    Provided By Technical University of Catalonia

  • White Papers // Aug 2008

    Activity-Related Biometric Authentication

    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 tasks performed in front of a computer, analysis of speech, continuous face and facial movement analysis, and even patterns for grasping objects. The authors...

    Provided By Technical University of Catalonia

  • White Papers // Jun 2008

    Achievable Bandwidth Estimation for Stations in Multi-Rate IEEE 802.11 WLAN Cells

    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 all stations even though transmissions carried out at lower rates capture the medium for longer periods, which drastically reduces the overall...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2008

    Analysis and Design of Networked Control Loops With Synchronization at the Actuation Instants

    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 research mainly focuses on deriving control approaches/solutions built upon the assumption that the operation of control loops is synchronized at the sampling instants. In...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2009

    Mechanism for Per-Class QoS Monitoring in IP/MPLS Transport Networks

    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 Engineering and the capabilities that lead it towards integration with IP-DiffServ are discussed. Several solutions for DS-TE MPLS are...

    Provided By Technical University of Catalonia

  • White Papers // Jun 2008

    Achievable Bandwidth Estimation for Stations in Multi-Rate IEEE 802.11 WLAN Cells

    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 all stations even though transmissions carried out at lower rates capture the medium for longer periods, which drastically reduces the overall...

    Provided By Technical University of Catalonia

  • White Papers // Jun 2009

    An Efficient Method for Service Level Agreement Assessment

    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 times) network Quality of Service (QoS) and performance parameters. Up to now, all the proposed solutions have the drawback of requiring a...

    Provided By Technical University of Catalonia

  • White Papers // Nov 2008

    Efficient Data Management Support for Virtualized Service Providers

    Virtualization has been lately introduced for supporting and simplifying service providers' management with promising results. Nevertheless, using virtualization introduces also new challenges that must be considered. One of them relates with the data management in the provider. This paper proposes an innovative approach for performing efficiently all the data-related processes...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2010

    Performance of Translucent Optical Networks Under Dynamic Traffic and Uncertain Physical-Layer Information

    This paper investigates the performance of translucent Optical Transport Networks (OTNs) under different traffic and knowledge conditions, varying from perfect knowledge to drifts and uncertainties in the physical-layer parameters. The focus is on the regular operation of a translucent OTN, i.e., after the dimensioning and regenerator placement phase. The contributions...

    Provided By Technical University of Catalonia

  • White Papers // Sep 2010

    Toward Business-Driven Risk Management for Cloud Computing

    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 systems management and is changing the way in which hardware and software are designed and purchased. Not withstanding, the use of Cloud resources, which...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2010

    Analysing the Overhead in Mobile Ad-Hoc Network With a Hierarchical Routing Structure

    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, routing in MANETs is flat; therefore, nodes have to learn how to reach each node in the network. It...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2009

    Using Filesystem Virtualization to Avoid Metadata Bottlenecks

    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 system performance. The observations indicate that the increased pressure on metadata management is one of the relevant...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2010

    Content-Based Image Retrieval as a Web Service

    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 remotely accessed through web services. Visual descriptors and similarity measures implemented in this work are mostly defined in the MPEG-7 standard, while...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2010

    Modeling Physical-Layer Impairments in Multi-Domain Optical Networks

    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 domains. The extension of transparent connections across domains requires advances both in the modeling of the impairments suffered by...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2011

    A Genetic Model for Pricing in Cloud Computing Markets

    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. Client applications and service providers meet in a market and negotiate for the sales of services by means of the signature of...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2009

    An Interoperability System for Authentication and Authorization in VANETs

    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 wide number of potential applications VANETs also raise a broad range of critical security challenges mostly related with Privacy, which remains as...

    Provided By Technical University of Catalonia

  • White Papers // Nov 2008

    Batch Job Profiling and Adaptive Profile Enforcement for Virtualized Environments

    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 performance delivered by the heterogeneous set of applications running in a virtualized enterprise data center must be predicted to make...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2009

    Experiences With Virtual Machine Profiling for Batch Jobs in Real Systems

    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 in real systems. The focus of the paper is put in the provisioning of resources for clusters of virtual machines...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2009

    Self-Triggered Networked Control Systems: An Experimental Case Study

    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 actuation, calculates the next job activation time as a function of the plant state. This paper describes the implementation of self-triggered controllers in Networked...

    Provided By Technical University of Catalonia

  • White Papers // Jul 2009

    Preliminary Approach to Lyapunov Sampling in CAN-Based Networked Control Systems

    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 for NCS capable of offering controllers with low bandwidth demands. The paper starts by presenting the theoretical framework required for...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2008

    Analysis and Design of Networked Control Loops With Synchronization at the Actuation Instants

    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 research mainly focuses on deriving control approaches/solutions built upon the assumption that the operation of control loops is synchronized at the sampling instants. In...

    Provided By Technical University of Catalonia

  • White Papers // Jul 2010

    Towards Energy Saving Wireless Body Sensor Networks in Health Care Systems

    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 solutions, which guarantee low-power consumption to all specific sorts of body sensors and traffic loads. While taking the...

    Provided By Technical University of Catalonia

  • White Papers // Mar 2009

    Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks

    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 in the network layer design. This is complicated by the diversity of modulation formats, transmission rates, amplification and compensation equipments, or deployed fiber links. Thereby, the...

    Provided By Technical University of Catalonia

  • White Papers // Aug 2008

    Activity-Related Biometric Authentication

    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 tasks performed in front of a computer, analysis of speech, continuous face and facial movement analysis, and even patterns for grasping objects. The authors...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2012

    The Internet and Transport Network Management Ecosystems: A Roadmap Toward Convergence

    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, significant challenges still remain. Over time, the inherent technological differences between the IP and transport networks have deeply segmented their operation,...

    Provided By Technical University of Catalonia

  • White Papers // Mar 2009

    An Adaptive Solution for Wireless LAN Distributed Power Saving Modes

    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 devices. IEEE 802.11 and 802.11e define mechanisms to address these challenges but do not provide any guidance about how to...

    Provided By Technical University of Catalonia

  • White Papers // Apr 2012

    Analysis of Path-Vector Routing Stability

    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 including the use of stability measurement metrics for the systematic analysis of BGP traces and associated meta-processing for determining the local...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2009

    J2EE Instrumentation for Software Aging Root Cause Application Component Determination With AspectJ

    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 their impact is increasing. According to many studies, one of the most important causes of these outages...

    Provided By Technical University of Catalonia

  • White Papers // Mar 2011

    Coaxial Narrowband Filters Using a Versatile Suspended Resonator

    In this paper, two four-pole filters at X-band are presented, both designs use a coaxial quarter wavelength resonator suspended in air by short circuits between the coaxial center and outer conductor. Different couplings between suspended resonators have been used to obtain a Chebyshev and a quasi-elliptic response. The Chebyshev filter...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2011

    Energy-Efficiency Analysis of a Distributed Queuing Medium Access Control Protocol for Biomedical Wireless Sensor Networks in Saturation Conditions

    The aging population and the high quality of life expectations in the society lead to the need of more efficient and affordable healthcare solutions. For this reason, this paper aims for the optimization of Medium Access Control (MAC) protocols for biomedical wireless sensor networks or wireless Body Sensor Networks (BSNs)....

    Provided By Technical University of Catalonia

  • White Papers // Apr 2009

    Any Traffic Routing Algorithm for Label-Based Forwarding

    The high capacity provided by packet-switched networks is supporting the proliferation of bandwidth intensive multimedia applications which require multicasting capability. As a consequence a mixed traffic scenario where both unicast and multicast demands compete for the same shared resources, is the one more likely to be found within the current...

    Provided By Technical University of Catalonia

  • White Papers // Jan 2012

    Stability Analysis of Path-Vector Routing

    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 including the use of stability measurement metrics for the systematic analysis of BGP traces and associated meta-processing for determining the local...

    Provided By Technical University of Catalonia

  • White Papers // Feb 2012

    Green Distance-Aware Base Station Sleeping Algorithm in LTE-Advanced

    In this paper, the authors propose a switch on/off algorithm for Base Stations (BSs), which exploits the knowledge of the distance between the User Equipments (UEs) and their associated BS. Their novel approach hopes to provide an improvement to the problem of energy consumption. The major concern lies on reducing...

    Provided By Technical University of Catalonia

  • White Papers // Dec 2012

    Body Sensors and Healthcare Monitoring - Design and Optimization of a Wireless Communication Protocol

    The aging population and the high expectations towards quality of life in user's society lead to the need of more efficient and affordable medical systems and monitoring solutions. The development of wireless Body Sensor Networks (BSNs) offers a platform to establish such a healthcare monitoring systems. However, BSNs in the...

    Provided By Technical University of Catalonia