University of Leeds

Displaying 1-16 of 16 results

  • White Papers // Jan 2012

    Quantum Cryptography With Generalized Bases and Dimensions of Photon States

    Quantum Key Distribution (QKD) is a secure key sharing technology with unconditional security. Certain well-known protocols for QKD have been presented, which claim their security by means of higher eavesdropping error-rates. A generalized quantum key distribution protocol that can be optimized for arbitrary number of bases and dimensions of photon...

    Provided By University of Leeds

  • White Papers // Sep 2011

    Adaptive Modulation for LDPC Coded-OFDM Based Powerline Communication System

    As a result of the impairments generated by the consumer electronic devices on power line channel extensive research has been carried out to mitigate the deteriorating effects. In this paper, the performance of an OFDM based power line communication system is evaluated under OPERA proposed power line channel. An adaptive...

    Provided By University of Leeds

  • White Papers // Jun 2011

    Energy-Efficiency in Cloud Computing Environments: Towards Energy Savings Without Performance Degradation

    Due to all the pollutants generated by it and the steady increases in its rates, energy consumption is causing serious environmental and economic problems. In this paper, the growing use and adoption of ICTs is being highlighted not only as one of the principal problem sources but also as one...

    Provided By University of Leeds

  • White Papers // Jan 2011

    Using the Cognitive Walkthrough to Improve the Design of a Visual Programming Experiment

    Visual programming languages aim to promote usability, but are rarely examined for it. One reason is the difficulty of designing successful experimental evaluations. The authors propose the Cognitive Walkthrough as an aid to improve experimental designs. This is a novel application of an HCI-derived technique designed for evaluating interfaces rather...

    Provided By University of Leeds

  • White Papers // Oct 2010

    Equal Opportunity And Disability

    The fact that the position of people with disabilities can be categorized along with those of women and ethnic minorities is an important question. It is for example accepted that the special needs of the disabled and of women may well differ in certain respects (although many solutions to specific...

    Provided By University of Leeds

  • White Papers // Aug 2010

    OPTIMIS: A Holistic Approach to Cloud Service Provisioning

    The authors present the fundamentals for a toolkit for scalable and dependable service platforms and architectures that enable flexible and dynamic provisioning of cloud services. The innovations behind the toolkit are aimed at optimizing the whole service life cycle, including service construction, deployment, and operation, on a basis of aspects...

    Provided By University of Leeds

  • White Papers // Jul 2010

    Model-Driven Development of Adaptable Service-Oriented Business Processes

    Businesses typically structure their activities with workflows, which are often implemented in a rather static fashion in their IT systems. Now-a-days, system requirements change rapidly as businesses try to maintain their competitive edge, calling for similar agility of the IT systems. To this paper, the authors present StPowla, an approach...

    Provided By University of Leeds

  • White Papers // Feb 2010

    Outage Probability Analysis of Cognitive Radio Networks Under Self-Coexistence Constraint

    Cognitive Radio Networks (CRNs) are envisioned to eradicate the artificial scarcity caused by today's stringent spectrum allocation policy. In this paper, the authors develop a statistical framework to model the outage probability at any arbitrary primary/licensed user, while operating in the presence of a collocated secondary network/CRN. A system model...

    Provided By University of Leeds

  • White Papers // Feb 2010

    The Sensoria Reference Modelling Language

    In this paper, the authors provide an overview of SRML - the Sensoria Reference Modelling Language. SRML offers a technology-agnostic framework in which business services and activities can be modeled independently of the languages in which components are implemented and the network protocols through which they communicate. From a methodological...

    Provided By University of Leeds

  • White Papers // Dec 2009

    Transmit Beamforming for MISO Frequency-Selective Channels With Total and Per-Antenna Power Constraints

    The authors consider the problem of transmit BeamForming (BF) design for Cyclic Prefixed (CP) transmissions over MISO frequency selective channels. Both CP single carriers (SC) and Orthogonal Frequency Division Multiplexing (OFDM) systems are investigated. To reduce receiver complexity, frequency domain BF is adopted. The BF is designed by minimizing the...

    Provided By University of Leeds

  • White Papers // Sep 2009

    Semi-Blind Locally Optimum Detection for Spectrum Sensing in Cognitive Radio

    Spectrum sensing in cognitive radio becomes a challenging task when the signals received at the secondary users' transmitters exhibit low power. Locally Optimum Detectors (LOD) are therefore desirable, thanks to their optimality in the low SNR regime. Here, the authors assume that the primary user transmits a training sequence, and...

    Provided By University of Leeds

  • White Papers // May 2009

    inContext - Interaction and Context-based Technologies for Collaborative Teams

    Much of today's teamwork is based on Collaborative Working Environments (CWEs). These are supporting team members participating in multiple projects at the same time, with the work spanning multiple organizations and the team members working on the move. Virtual, nimble, and mobile teams evolve and merge reflecting the vibrant nature...

    Provided By University of Leeds

  • White Papers // Apr 2009

    An Integrated Intrusion Detection and Diagnosis for Clouds

    Improving dependability of Cloud computing is critical to the realization of its potential as a technology to facilitate the development of large-scale, flexible computing infrastructures, available on-demand to meet computation requirements of compute intensive workloads. However, unique characteristics such as; Diversity, Flexibility and Mobility inherited by such systems require dedicated...

    Provided By University of Leeds

  • White Papers // Apr 2009

    Extension of GPS Broadcast Ephemeris to Determine Satellite Velocity and Acceleration

    This paper presents an expansion of the algorithm provided in the GPS ICD to include the precise real-time computation in ECEF coordinate of the velocity and acceleration components of the satellite orbit besides the position components using the broadcast ephemeris. Precise satellite velocity and acceleration data are needed for applications...

    Provided By University of Leeds

  • White Papers // Apr 2008

    From BPEL to SRML: A Formal Transformational Approach

    The SENSORIA Reference Modeling Language (SRML) provides primitives for modeling business processes in a technology agnostic way. At the core of SRML is the notion of module as a composition of tightly coupled components and loosely coupled, dynamically discovered services. This paper presents an encoding of BPEL processes into SRML...

    Provided By University of Leeds

  • White Papers // Dec 2007

    Towards Feature Interactions in Business Processes

    The feature interaction problem is generally associated with conflicting features causing undesirable effects. However, in this paper, the authors report on a situation where the combination of features (as policies) and service-targeted business processes yields non-negative effects. They consider business processes as base systems and policies as a feature mechanism...

    Provided By University of Leeds

  • White Papers // Oct 2010

    Equal Opportunity And Disability

    The fact that the position of people with disabilities can be categorized along with those of women and ethnic minorities is an important question. It is for example accepted that the special needs of the disabled and of women may well differ in certain respects (although many solutions to specific...

    Provided By University of Leeds

  • White Papers // Jan 2011

    Using the Cognitive Walkthrough to Improve the Design of a Visual Programming Experiment

    Visual programming languages aim to promote usability, but are rarely examined for it. One reason is the difficulty of designing successful experimental evaluations. The authors propose the Cognitive Walkthrough as an aid to improve experimental designs. This is a novel application of an HCI-derived technique designed for evaluating interfaces rather...

    Provided By University of Leeds

  • White Papers // Sep 2009

    Semi-Blind Locally Optimum Detection for Spectrum Sensing in Cognitive Radio

    Spectrum sensing in cognitive radio becomes a challenging task when the signals received at the secondary users' transmitters exhibit low power. Locally Optimum Detectors (LOD) are therefore desirable, thanks to their optimality in the low SNR regime. Here, the authors assume that the primary user transmits a training sequence, and...

    Provided By University of Leeds

  • White Papers // Apr 2009

    Extension of GPS Broadcast Ephemeris to Determine Satellite Velocity and Acceleration

    This paper presents an expansion of the algorithm provided in the GPS ICD to include the precise real-time computation in ECEF coordinate of the velocity and acceleration components of the satellite orbit besides the position components using the broadcast ephemeris. Precise satellite velocity and acceleration data are needed for applications...

    Provided By University of Leeds

  • White Papers // Feb 2010

    Outage Probability Analysis of Cognitive Radio Networks Under Self-Coexistence Constraint

    Cognitive Radio Networks (CRNs) are envisioned to eradicate the artificial scarcity caused by today's stringent spectrum allocation policy. In this paper, the authors develop a statistical framework to model the outage probability at any arbitrary primary/licensed user, while operating in the presence of a collocated secondary network/CRN. A system model...

    Provided By University of Leeds

  • White Papers // Dec 2009

    Transmit Beamforming for MISO Frequency-Selective Channels With Total and Per-Antenna Power Constraints

    The authors consider the problem of transmit BeamForming (BF) design for Cyclic Prefixed (CP) transmissions over MISO frequency selective channels. Both CP single carriers (SC) and Orthogonal Frequency Division Multiplexing (OFDM) systems are investigated. To reduce receiver complexity, frequency domain BF is adopted. The BF is designed by minimizing the...

    Provided By University of Leeds

  • White Papers // Jun 2011

    Energy-Efficiency in Cloud Computing Environments: Towards Energy Savings Without Performance Degradation

    Due to all the pollutants generated by it and the steady increases in its rates, energy consumption is causing serious environmental and economic problems. In this paper, the growing use and adoption of ICTs is being highlighted not only as one of the principal problem sources but also as one...

    Provided By University of Leeds

  • White Papers // Apr 2009

    An Integrated Intrusion Detection and Diagnosis for Clouds

    Improving dependability of Cloud computing is critical to the realization of its potential as a technology to facilitate the development of large-scale, flexible computing infrastructures, available on-demand to meet computation requirements of compute intensive workloads. However, unique characteristics such as; Diversity, Flexibility and Mobility inherited by such systems require dedicated...

    Provided By University of Leeds

  • White Papers // Apr 2008

    From BPEL to SRML: A Formal Transformational Approach

    The SENSORIA Reference Modeling Language (SRML) provides primitives for modeling business processes in a technology agnostic way. At the core of SRML is the notion of module as a composition of tightly coupled components and loosely coupled, dynamically discovered services. This paper presents an encoding of BPEL processes into SRML...

    Provided By University of Leeds

  • White Papers // Jul 2010

    Model-Driven Development of Adaptable Service-Oriented Business Processes

    Businesses typically structure their activities with workflows, which are often implemented in a rather static fashion in their IT systems. Now-a-days, system requirements change rapidly as businesses try to maintain their competitive edge, calling for similar agility of the IT systems. To this paper, the authors present StPowla, an approach...

    Provided By University of Leeds

  • White Papers // Jan 2012

    Quantum Cryptography With Generalized Bases and Dimensions of Photon States

    Quantum Key Distribution (QKD) is a secure key sharing technology with unconditional security. Certain well-known protocols for QKD have been presented, which claim their security by means of higher eavesdropping error-rates. A generalized quantum key distribution protocol that can be optimized for arbitrary number of bases and dimensions of photon...

    Provided By University of Leeds

  • White Papers // Sep 2011

    Adaptive Modulation for LDPC Coded-OFDM Based Powerline Communication System

    As a result of the impairments generated by the consumer electronic devices on power line channel extensive research has been carried out to mitigate the deteriorating effects. In this paper, the performance of an OFDM based power line communication system is evaluated under OPERA proposed power line channel. An adaptive...

    Provided By University of Leeds

  • White Papers // Aug 2010

    OPTIMIS: A Holistic Approach to Cloud Service Provisioning

    The authors present the fundamentals for a toolkit for scalable and dependable service platforms and architectures that enable flexible and dynamic provisioning of cloud services. The innovations behind the toolkit are aimed at optimizing the whole service life cycle, including service construction, deployment, and operation, on a basis of aspects...

    Provided By University of Leeds

  • White Papers // Dec 2007

    Towards Feature Interactions in Business Processes

    The feature interaction problem is generally associated with conflicting features causing undesirable effects. However, in this paper, the authors report on a situation where the combination of features (as policies) and service-targeted business processes yields non-negative effects. They consider business processes as base systems and policies as a feature mechanism...

    Provided By University of Leeds

  • White Papers // Feb 2010

    The Sensoria Reference Modelling Language

    In this paper, the authors provide an overview of SRML - the Sensoria Reference Modelling Language. SRML offers a technology-agnostic framework in which business services and activities can be modeled independently of the languages in which components are implemented and the network protocols through which they communicate. From a methodological...

    Provided By University of Leeds

  • White Papers // May 2009

    inContext - Interaction and Context-based Technologies for Collaborative Teams

    Much of today's teamwork is based on Collaborative Working Environments (CWEs). These are supporting team members participating in multiple projects at the same time, with the work spanning multiple organizations and the team members working on the move. Virtual, nimble, and mobile teams evolve and merge reflecting the vibrant nature...

    Provided By University of Leeds