National University Of Ireland

Displaying 1-40 of 63 results

  • White Papers // Nov 2013

    Complex Event Service Provision and Composition Based on Event Pattern Matchmaking

    Service computing has gained great success because it de-couples service providers and consumers. Because of this decoupling, it is possible to reuse software applications with-out knowing their implementation details. However, business applications consuming complex events (and complex event processing systems in general) are not taking such benefits from service computing,...

    Provided By National University Of Ireland

  • White Papers // Sep 2013

    On-The-Fly Generation of Multidimensional Data Cubes for Web of Things

    The dynamicity of sensor data sources and publishing real-time sensor data over a generalized infrastructure like the web pose a new set of integration challenges. Semantic sensor networks demand excessive expressivity for efficient formal analysis of sensor data. This paper specifically addresses the problem of adapting data model specific or...

    Provided By National University Of Ireland

  • White Papers // Aug 2013

    Characterising Concepts of Interest Leveraging Linked Data and the Social Web

    Extracting and representing user interests on the social web is becoming an essential part of the web for personalization and recommendations. Such personalization is required in order to provide an adaptive web to users, where content fits their preferences, background and current interests, making the web more social and relevant....

    Provided By National University Of Ireland

  • White Papers // Aug 2013

    A Bayesian Association Rule Mining Algorithm

    Linked2Safety (L2S) is an EU-funded research project which aims to build a next-generation, semantically interlinked, secure medical and clinical information space. This paper proposes a Bayesian Association Rule mining algorithm (BAR) which combines the Apriori association rule mining algorithm with Bayesian networks. Two interestingness measures of association rules: Bayesian Confidence...

    Provided By National University Of Ireland

  • White Papers // Aug 2013

    Secure Manipulation of Linked Data

    When it comes to publishing data on the web, the level of access control required (if any) is highly dependent on the type of content exposed. Up until now RDF data publishers have focused on exposing and linking public data. With the advent of SPARQL 1.1, the linked data infrastructure...

    Provided By National University Of Ireland

  • White Papers // Jul 2013

    IT Risk Management: A Capability Maturity Model Perspective

    Understanding the value derived from IT investments and IT enabled operational improvements is difficult, and has been a subject of research and debate among ICT practitioners and academics for many years. This is particularly so because innovative technological developments have supported transformative changes in organizational operational activities. Research continues to...

    Provided By National University Of Ireland

  • White Papers // Jun 2013

    Cloud Enterprise Resource Planning (ERP): A Viable Alternative for Irish e-Government

    While the recent transition of Irish e-Government to cloud computing is laden with opportunities and risks, it is imperative to identify public sector mission critical applications that would derive substantial benefits from moving to a cloud based solution. In this paper, the authors explored the ERP potential of cloud computing...

    Provided By National University Of Ireland

  • White Papers // May 2013

    ACE: A Concept Extraction Approach Using Linked Open Data

    Given the increase in popularity of several social networks, numerous users tend to express themselves or reach out to their followers via online posts, normally in the form of microposts. Dealing with such data of short textual content can be quite intricate due to several factors such as misspellings, slang,...

    Provided By National University Of Ireland

  • White Papers // May 2013

    RDFS & OWL Reasoning for Linked Data

    Linked data promises that a large portion of web data will be usable as one big interlinked RDF database against which structured queries can be answered. In this paper, the authors will show how reasoning - using RDF Schema (RDFS) and the Web Ontology Language (OWL) - can help to...

    Provided By National University Of Ireland

  • White Papers // Feb 2013

    Information Diffusion on the Iterated Local Transitivity Model of Online Social Networks

    Understanding how information and rumors spread is a key issue for modern society. Malicious or inaccurate rumors can lead to unnecessary panic and generate social and economic instability. The authors study a recently introduced deterministic model of competitive information diffusion on the Iterated Local Transitivity (ILT) model of Online Social...

    Provided By National University Of Ireland

  • White Papers // Feb 2013

    Scalable Distributed Indexing and Query Processing over Linked Data

    Linked data is becoming the core part of modern web applications and thus efficient access to structured information expressed in RDF gains paramount importance. A number of efficient local RDF stores exist already, while distributed indexing and distributed query processing over linked data with similar efficiency and data management features...

    Provided By National University Of Ireland

  • White Papers // Jan 2013

    Update Semantics for Interoperability Among XML, RDF and RDB: A Case Study of Semantic Presence in CISCO's Unified Presence Systems

    XSPARQL is a transformation and querying language that provides an integrated access over heterogeneous data sources on the y. It is an extension of XQuery which supports a subset of SPARQL and SQL to provide unified access over XML, RDF and RDB formats. In practical applications, data integration does not...

    Provided By National University Of Ireland

  • White Papers // Jan 2013

    A Generic Algorithm for Mid-call Audio Codec Switching

    The authors present and evaluate an algorithm that performs in-call selection of the most appropriate audio codec given prevailing conditions on the network path between the endpoints of a voice call. They have studied the behavior of different codecs under varying network conditions, in doing so deriving the impairment factors...

    Provided By National University Of Ireland

  • White Papers // Oct 2012

    Monitoring VoIP Call Quality Using Improved Simplified E-model

    ITU-T recommendation G.107 introduced the Emodel, a repeatable way to assess if a network is prepared to carry a VoIP call or not. Various studies show that the Emodel is complex with many factors to be used in monitoring purposes. Consequently, simplified versions of the E-model have been proposed to...

    Provided By National University Of Ireland

  • White Papers // Sep 2012

    Spamming in Linked Data

    The rapidly growing commercial interest in Linked Data raises the prospect of \"Linked Data spam\", which the authors define as \"Deliberately misleading information (data and links) published as Linked Data, with the goal of creating financial gain for the publisher\". Compared to conventional technologies affected by spamming, e.g. email and...

    Provided By National University Of Ireland

  • White Papers // May 2012

    Analysis of Radar Detection Probabilities in Time Division Duplexed Systems

    Dynamic Frequency Selection (DFS) is the technology chosen by ETSI, FCC, and Industry Canada to provide unlicensed access for broadband radios in licensed bands. It may be viewed as a basic form of cognitive radio, where broadband radios share spectrum with radar users, and is implemented by the base station...

    Provided By National University Of Ireland

  • White Papers // May 2012

    An Environmental Chargeback for Data Center and Cloud Computing Consumers

    Government, business, and the general public increasingly agree that the polluter should pay. Carbon dioxide and environmental damage are considered viable chargeable commodities. The net effect of this for data center and cloud computing operators is that they should look to \"Chargeback\" the environmental impacts of their services to the...

    Provided By National University Of Ireland

  • White Papers // May 2012

    WLAN Channel Selection Without Communication

    The authors propose a new class of channel allocation algorithms that are simple, robust and require no communication between interfering WLANs. They show they are provably correct and yet remarkably efficient under a wide range of network conditions and topologies. The algorithms are suited to implementation on standard equipment, requiring...

    Provided By National University Of Ireland

  • White Papers // Feb 2012

    Managing Cloud Computing: A Life Cycle Approach

    Cloud computing has the promise of significant benefits that include reduced costs, improved service provisioning, and a move to a pay-per-use model. However, there also are many challenges to successfully delivering cloud-based services; including security, data ownership, interoperability, service maturity and return on investment. These challenges need to be understood...

    Provided By National University Of Ireland

  • White Papers // Feb 2012

    Experiments With Radiated Interference From In-Home Power Line Communication Networks

    Power Line Communication (PLC) technology is at a tipping point and may become ubiquitous as a home networking technology. However, there are concerns regarding RF interference between PLC networks and other radio operators. It is imperative that the interference dynamics of PLC systems be fully understood in advance of any...

    Provided By National University Of Ireland

  • White Papers // Jan 2012

    Building a Process Performance Model for Business Activity Monitoring

    A formal Business Process Model serves as a common understanding of how business tasks are carried out to achieve end goals. The business process life cycle is managed using Business Process Management tools and methodologies. Business Activity Monitoring provides (near) real-time visibility into process execution notifying relevant personnel of process...

    Provided By National University Of Ireland

  • White Papers // Dec 2011

    H-RCA: 802.11 Collision-aware Rate Control

    Rate control methodologies that are currently available in 802.11 network cards seriously under-utilize network resources and, in addition, per-second throughputs suffer from high variability. In this paper, the authors introduce an algorithm, HRCA that overcomes these shortcomings, giving substantially higher, and less variable, throughput. The approach solely uses information already...

    Provided By National University Of Ireland

  • White Papers // Nov 2011

    Dynamics of Contention Free Period Reservation in IEEE 1901 Networks

    Power Line Communications (PLC) technology has become a competitor in the home networking arena. In an internetworked home, PLC promises to provide an inexpensive, high throughput, and easy-to-install means of extending connectivity to areas of the home or small office that have poor wireless coverage. A key enabling technology within...

    Provided By National University Of Ireland

  • White Papers // Jun 2011

    From Online Community Data to RDF

    Large amounts of data are created within online community sites (forums, blogs, etc.). These can serve as a valuable source of information for web users, and usually contain rich meta-information. Most of this information is stored in relational databases, but unfortunately remains locked into these databases and cannot be used...

    Provided By National University Of Ireland

  • White Papers // Apr 2011

    MAPPING BETWEEN RDF and XML WITH XSPARQL

    One of the promises of Semantic Web applications is to seamlessly deal with heterogeneous data. While the EXtensible Markup Language (XML) has become widely adopted as an almost ubiquitous interchange format for data, along with transformation languages like XSLT and XQuery to translate from one XML format into another, the...

    Provided By National University Of Ireland

  • White Papers // Mar 2011

    Scalable OWL 2 Reasoning for Linked Data

    The goal of the scalable OWL 2 reasoning for linked data tutorial is twofold: first, to introduce scalable reasoning and querying techniques to SW researchers as powerful tool to make use of linked data and large-scale ontologies, and second, to present interesting research problems for SW that arise in dealing...

    Provided By National University Of Ireland

  • White Papers // Feb 2011

    Strategic Investment And The Gains From Trade

    This paper examines how trade liberalisation affects innovation, profits and welfare when firms are engaging in strategic R&D investment. The authors show that there are multiple equilibria including autarky equilibrium for a range of high but non-prohibitive trade costs. At lower trade costs, only the trading equilibrium survives. Welfare is...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    The 802.11g 11 Mb/s Rate Is More Robust Than 6 Mb/s

    The robustness to noise of the 802.11b/g 5.5 Mb/s and 11 Mb/s rates must be investigated experimentally as they cannot be predicted theoretically. In this paper, the authors report on detailed outdoor and indoor measurements that lead one to the surprising conclusion that the 11 Mb/s 802.11g rate experiences fewer...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Construction of a PLC Test Bed for Network and Transport Layer Experiments

    With the recent ratification of the IEEE 1901 Power Line Communications (PLC) standard, PLC is at a tipping point and may become ubiquitous as a home networking technology. In an inter-networked home, PLC promises to provide an inexpensive, high throughput, and easy-to-install means of extending connectivity to areas of the...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Modeling the 802.11 Distributed Coordination Function in Non-Saturated Heterogeneous Conditions

    Analysis of the 802.11 CSMA/CA mechanisms has received considerable attention recently. Bianchi presents an analytic model under a saturated traffic assumption. Bianchi's model is accurate, but typical network conditions are non-saturated and heterogeneous. The authors present an extension of his model to a non-saturated environment. The model's predictions, validated against...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Understanding 802.11e Voice Behaviour Via Testbed Measurements and Modeling

    Analytic modeling and simulation of 802.11 and 802.11e have flagged up a number of potential performance problems with voice in an infrastructure mode network. This body of work has also predicted a number of possible solutions, such as the use of TXOP. In this paper, the authors reproduce a number...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Experimental Evaluation of 802.11e EDCA for Enhanced Voice Over WLAN Performance

    The 802.11e MAC protocol extends the 802.11 CSMA/CA contention mechanism by allowing the adjustment of MAC parameters that were previously fixed. While the 802.11e protocol has been extensively studied, this paper is almost entirely confined to analytical and simulation studies. In this paper, the authors demonstrate a technique for measuring...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Incentivising Fairness and Policing Nodes in WiFi

    In this paper, the authors propose a feedback-based scheme to penalise misbehaving nodes in an 802.11 network based on gains achieved due to their (mis)configuration. Only the Access Point (AP) is modified and the scheme requires no additional communication or cooperation from other nodes. They achieve this by failing to...

    Provided By National University Of Ireland

  • White Papers // Sep 2010

    Continuous Query Optimization and Evaluation Over Unified Linked Stream Data and Linked Open Data

    In this paper, the authors address the problem of scalable query processing over linked stream data integrated with linked open data. Linked stream data consists of data generated by stream sources, e.g., sensors, enriched with semantic descriptions, following the standards proposed for linked data. This will enable the easy integration...

    Provided By National University Of Ireland

  • White Papers // Aug 2010

    Towards Understanding the ChangingWeb: Mining the Dynamics of Linked-Data Sources and Entities

    A huge amount of content found on the web is dynamic by its nature, particularly with the rise of web 2.0 and beyond. This is of special interest for the semantic web community, not only but particularly regarding resources on the Linked Open Data (LOD) web. However, the dataset dynamics...

    Provided By National University Of Ireland

  • White Papers // Aug 2010

    Unifying Stream Data and Linked Open Data

    With the increasing popularity of sensor networks there has been a lot of effort in lifting the contents of such networks to a semantic level. This opens doors to the integration of sensor data with the more established semantic data sets, such as the linked open data initiative, facilitating a...

    Provided By National University Of Ireland

  • White Papers // Jul 2010

    Using ATL in a Tool-Chain to Calculate Coverage Data for UML Class Diagrams

    Typically, test suites for source code can be measured in terms of their coverage of code features, such as statement, condition or decision coverage. In the context of Model Driven Engineering (MDE), a considerable body of research exists in the area of model-based testing, and a number of coverage criteria...

    Provided By National University Of Ireland

  • White Papers // Jul 2010

    A General Framework for Representing, Reasoning and Querying With Annotated Semantic Web Data

    The authors describe a generic framework for representing and reasoning with annotated Semantic Web data, a task becoming more important with the recent increased amount of inconsistent and non-reliable meta-data on the web. They formalise the annotated language, the corresponding deductive system and address the query answering problem. The paper...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Buffer Sizing for 802.11 Based Networks

    The authors consider the sizing of network buffers in 802.11 based networks. Wireless networks face a number of fundamental issues that do not arise in wired networks. They demonstrate that the use of fixed size buffers in 802.11 networks inevitably leads to either undesirable channel under-utilization or unnecessary high delays....

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Ambient Radiofrequency Power: The Impact of the Number of Devices in a Wi-Fi Network

    This paper considers how the total radiofrequency power varies as the number of devices in Wi-Fi network increases. Under the assumption that all devices in the network always have data to transmit, the authors show that work from network engineering can be adapted to calculate the total transmitted power, accounting...

    Provided By National University Of Ireland

  • White Papers // Oct 2009

    802.11 Wireless LAN Multiplayer Game Capacity and Optimization

    Real-time multiplayer games are a popular application of networks and as IEEE 802.11 wireless networks are widely used, games are expected to be widely played on wireless networks. However, 802.11 networks with the normal MAC (DCF) may present some challenges when supporting real-time games traffic. In this work, the authors...

    Provided By National University Of Ireland

  • White Papers // Apr 2010

    FDI And Domestic Capital Stock In US Manufacturing Industries: Crowding-Out And Displacement Effects

    The global financial crisis has witnessed a dramatic slowdown in FDI flows, yet concerns over its possible impacts on investment and employment in home and host economies have actually intensified. Although weakened national economies may be a source of many such concerns, research has yet to clarify many of the...

    Provided By National University Of Ireland

  • White Papers // Apr 2010

    Income Security Programmes And Retirement Behaviour In Ireland

    This paper gives a first-time assessment of the interaction between income security programmers (public and private) and the labor force behavior of older people in Ireland. Workers close to retirement age face a trade-off between earnings from continued work and benefit payments from income security programmers (public and private). Using...

    Provided By National University Of Ireland

  • White Papers // Apr 2010

    Quantitative Risk Estimation In The Credit Default Swap Market Using Extreme Value Theory

    This paper is motivated by empirical evidence illustrating the non-Gaussian nature of financial returns, (Jondeau et al 2007) and analyses Extreme Value Theory, (EVT) as a proposed improvement (Embrechts et al., 2005) for risk estimation techniques. Credit Default Swaps, (CDS's) are analysed due to their increasing important to financial stability...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Aggregate Earnings Inequality In Europe: Permanent Differences Or Transitory Fluctuations?

    This paper examines the relationship between aggregate inequality and its underlying components for a number of European countries. The authors use a well established GMM approach to separate the permanent component from the transitory component of earnings inequality. These results show that three quarters of the observed cross-country differences in...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Linkages between Excess Currency And Stock Market Returns: Granger Causality In Mean And Variance

    This paper investigates the causal linkages between monetary and equity market integration of the New Member States (NMS) as well as of the Non Economic Monetary Union (Non-EMU) member states with the euro zone, after the official launch of the euro. Granger causality in mean and in variance tests are...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Identification Of The Covariance Structure Of Earnings Using The GMM Estimator

    In this paper the authors study the performance of the GMM estimator in the context of the covariance structure of earnings. Using analytical and Monte Carlo techniques they examine the sensitivity of parameter identification to key features such as panel length, sample size, the degree of persistence of earnings shocks...

    Provided By National University Of Ireland

  • White Papers // Oct 2009

    The Sequencing Of Stock Market Liberalization Events And Corporate Financing Decisions

    The authors examine if the sequence of stock market liberalization events matters for corporate financing choices. They contrast firms who attain 'Investable' status through domestic reforms with those who do so by issuing American Depository Receipt programs. They find that the first liberalization event prompts similar corporate responses regardless of...

    Provided By National University Of Ireland

  • White Papers // Feb 2011

    Strategic Investment And The Gains From Trade

    This paper examines how trade liberalisation affects innovation, profits and welfare when firms are engaging in strategic R&D investment. The authors show that there are multiple equilibria including autarky equilibrium for a range of high but non-prohibitive trade costs. At lower trade costs, only the trading equilibrium survives. Welfare is...

    Provided By National University Of Ireland

  • White Papers // Apr 2010

    Bilateral FDI And Canadian Export Activity

    This paper examines how Canadian exports to a specific trading partner are influenced by outward and inward direct investment flows to/from that country. A gravity-type empirical model guides a dynamic panel analysis which utilizes OECD country-level data from 1989-2007. Besides refuting the contention that outward FDI displaces exports, the findings...

    Provided By National University Of Ireland

  • White Papers // Jun 2011

    From Online Community Data to RDF

    Large amounts of data are created within online community sites (forums, blogs, etc.). These can serve as a valuable source of information for web users, and usually contain rich meta-information. Most of this information is stored in relational databases, but unfortunately remains locked into these databases and cannot be used...

    Provided By National University Of Ireland

  • White Papers // Jul 2010

    Using ATL in a Tool-Chain to Calculate Coverage Data for UML Class Diagrams

    Typically, test suites for source code can be measured in terms of their coverage of code features, such as statement, condition or decision coverage. In the context of Model Driven Engineering (MDE), a considerable body of research exists in the area of model-based testing, and a number of coverage criteria...

    Provided By National University Of Ireland

  • White Papers // Nov 2009

    NS-2 Extension for Dynamic Optimization Within Multiple VoIP Sessions Over Wireless Networks

    The Network Simulator NS-2 is a versatile extendable tool that is widely used in the networking community. It provides support for simulation of many protocols over networks including 802.11e. To investigate network performance, researchers can configure a network scenario with an easy-to-use scripting language, and then observe results generated by...

    Provided By National University Of Ireland

  • White Papers // Apr 2011

    MAPPING BETWEEN RDF and XML WITH XSPARQL

    One of the promises of Semantic Web applications is to seamlessly deal with heterogeneous data. While the EXtensible Markup Language (XML) has become widely adopted as an almost ubiquitous interchange format for data, along with transformation languages like XSLT and XQuery to translate from one XML format into another, the...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Redundancy Elimination on RDF Graphs in the Presence of Rules, Constraints, and Queries

    Based on practical observations on rule-based inference on RDF data, the authors study the problem of redundancy elimination on RDF graphs in the presence of rules (in the form of Datalog rules) and constraints, (in the form of so-called tuple-generating dependencies), and with respect to queries (ranging from conjunctive queries...

    Provided By National University Of Ireland

  • White Papers // Sep 2010

    Continuous Query Optimization and Evaluation Over Unified Linked Stream Data and Linked Open Data

    In this paper, the authors address the problem of scalable query processing over linked stream data integrated with linked open data. Linked stream data consists of data generated by stream sources, e.g., sensors, enriched with semantic descriptions, following the standards proposed for linked data. This will enable the easy integration...

    Provided By National University Of Ireland

  • White Papers // Jul 2010

    A General Framework for Representing, Reasoning and Querying With Annotated Semantic Web Data

    The authors describe a generic framework for representing and reasoning with annotated Semantic Web data, a task becoming more important with the recent increased amount of inconsistent and non-reliable meta-data on the web. They formalise the annotated language, the corresponding deductive system and address the query answering problem. The paper...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Ambient Radiofrequency Power: The Impact of the Number of Devices in a Wi-Fi Network

    This paper considers how the total radiofrequency power varies as the number of devices in Wi-Fi network increases. Under the assumption that all devices in the network always have data to transmit, the authors show that work from network engineering can be adapted to calculate the total transmitted power, accounting...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Modeling the 802.11 Distributed Coordination Function in Non-Saturated Heterogeneous Conditions

    Analysis of the 802.11 CSMA/CA mechanisms has received considerable attention recently. Bianchi presents an analytic model under a saturated traffic assumption. Bianchi's model is accurate, but typical network conditions are non-saturated and heterogeneous. The authors present an extension of his model to a non-saturated environment. The model's predictions, validated against...

    Provided By National University Of Ireland

  • White Papers // Apr 2010

    Field Measurements of 802.11 Collision, Noise and Hidden-Node Loss Rates

    In this paper, the authors present the first field measurements taken using a new approach proposed in for measuring link impairments in 802.11 WLANs. This uses a sender-side MAC/PHY cross-layer technique that can be implemented on standard hardware and is able to explicitly classify lost transmission opportunities into noise-related losses,...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Construction of a PLC Test Bed for Network and Transport Layer Experiments

    With the recent ratification of the IEEE 1901 Power Line Communications (PLC) standard, PLC is at a tipping point and may become ubiquitous as a home networking technology. In an inter-networked home, PLC promises to provide an inexpensive, high throughput, and easy-to-install means of extending connectivity to areas of the...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Understanding 802.11e Voice Behaviour Via Testbed Measurements and Modeling

    Analytic modeling and simulation of 802.11 and 802.11e have flagged up a number of potential performance problems with voice in an infrastructure mode network. This body of work has also predicted a number of possible solutions, such as the use of TXOP. In this paper, the authors reproduce a number...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Experimental Evaluation of 802.11e EDCA for Enhanced Voice Over WLAN Performance

    The 802.11e MAC protocol extends the 802.11 CSMA/CA contention mechanism by allowing the adjustment of MAC parameters that were previously fixed. While the 802.11e protocol has been extensively studied, this paper is almost entirely confined to analytical and simulation studies. In this paper, the authors demonstrate a technique for measuring...

    Provided By National University Of Ireland

  • White Papers // Jun 2010

    Buffer Sizing for 802.11 Based Networks

    The authors consider the sizing of network buffers in 802.11 based networks. Wireless networks face a number of fundamental issues that do not arise in wired networks. They demonstrate that the use of fixed size buffers in 802.11 networks inevitably leads to either undesirable channel under-utilization or unnecessary high delays....

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    Incentivising Fairness and Policing Nodes in WiFi

    In this paper, the authors propose a feedback-based scheme to penalise misbehaving nodes in an 802.11 network based on gains achieved due to their (mis)configuration. Only the Access Point (AP) is modified and the scheme requires no additional communication or cooperation from other nodes. They achieve this by failing to...

    Provided By National University Of Ireland

  • White Papers // Jan 2011

    The 802.11g 11 Mb/s Rate Is More Robust Than 6 Mb/s

    The robustness to noise of the 802.11b/g 5.5 Mb/s and 11 Mb/s rates must be investigated experimentally as they cannot be predicted theoretically. In this paper, the authors report on detailed outdoor and indoor measurements that lead one to the surprising conclusion that the 11 Mb/s 802.11g rate experiences fewer...

    Provided By National University Of Ireland

  • White Papers // May 2010

    On the Validity of IEEE 802.11 MAC Modeling Hypotheses

    The authors identify common hypotheses on which a large number of distinct mathematical models of WLANs employing IEEE 802.11 are founded. Using data from an experimental test bed and packet-level ns-2 simulations, they investigate the veracity of these hypotheses. They demonstrate that several of these assumptions are inaccurate and/or inappropriate....

    Provided By National University Of Ireland

  • White Papers // Nov 2011

    Dynamics of Contention Free Period Reservation in IEEE 1901 Networks

    Power Line Communications (PLC) technology has become a competitor in the home networking arena. In an internetworked home, PLC promises to provide an inexpensive, high throughput, and easy-to-install means of extending connectivity to areas of the home or small office that have poor wireless coverage. A key enabling technology within...

    Provided By National University Of Ireland

  • White Papers // May 2012

    Analysis of Radar Detection Probabilities in Time Division Duplexed Systems

    Dynamic Frequency Selection (DFS) is the technology chosen by ETSI, FCC, and Industry Canada to provide unlicensed access for broadband radios in licensed bands. It may be viewed as a basic form of cognitive radio, where broadband radios share spectrum with radar users, and is implemented by the base station...

    Provided By National University Of Ireland

  • White Papers // May 2012

    WLAN Channel Selection Without Communication

    The authors propose a new class of channel allocation algorithms that are simple, robust and require no communication between interfering WLANs. They show they are provably correct and yet remarkably efficient under a wide range of network conditions and topologies. The algorithms are suited to implementation on standard equipment, requiring...

    Provided By National University Of Ireland

  • White Papers // Aug 2009

    Achieving End-to-End Fairness in 802.11e Based Wireless Multi-Hop Mesh Networks Without Coordination

    To mitigate the damaging impacts caused by interference and hidden terminals, it has been proposed to use orthogonal channels in wireless multi-hop mesh networks. The authors demonstrate however that even if these issues are completely eliminated with perfectly assigned channels, gross unfairness can still exist amongst competing flows which traverse...

    Provided By National University Of Ireland

  • White Papers // Feb 2012

    Experiments With Radiated Interference From In-Home Power Line Communication Networks

    Power Line Communication (PLC) technology is at a tipping point and may become ubiquitous as a home networking technology. However, there are concerns regarding RF interference between PLC networks and other radio operators. It is imperative that the interference dynamics of PLC systems be fully understood in advance of any...

    Provided By National University Of Ireland

  • White Papers // Aug 2009

    Semantically-Aided Business Process Modeling

    Enriching business process models with semantic annotations taken from ontology has become a crucial necessity both in service provisioning, integration and composition, and in business processes management. In this paper, the authors represent semantically annotated business processes as part of an OWL knowledge base that formalizes the business process structure,...

    Provided By National University Of Ireland

  • White Papers // Feb 2012

    Managing Cloud Computing: A Life Cycle Approach

    Cloud computing has the promise of significant benefits that include reduced costs, improved service provisioning, and a move to a pay-per-use model. However, there also are many challenges to successfully delivering cloud-based services; including security, data ownership, interoperability, service maturity and return on investment. These challenges need to be understood...

    Provided By National University Of Ireland

  • White Papers // Jun 2013

    Cloud Enterprise Resource Planning (ERP): A Viable Alternative for Irish e-Government

    While the recent transition of Irish e-Government to cloud computing is laden with opportunities and risks, it is imperative to identify public sector mission critical applications that would derive substantial benefits from moving to a cloud based solution. In this paper, the authors explored the ERP potential of cloud computing...

    Provided By National University Of Ireland

  • White Papers // May 2012

    An Environmental Chargeback for Data Center and Cloud Computing Consumers

    Government, business, and the general public increasingly agree that the polluter should pay. Carbon dioxide and environmental damage are considered viable chargeable commodities. The net effect of this for data center and cloud computing operators is that they should look to \"Chargeback\" the environmental impacts of their services to the...

    Provided By National University Of Ireland

  • White Papers // Jul 2013

    IT Risk Management: A Capability Maturity Model Perspective

    Understanding the value derived from IT investments and IT enabled operational improvements is difficult, and has been a subject of research and debate among ICT practitioners and academics for many years. This is particularly so because innovative technological developments have supported transformative changes in organizational operational activities. Research continues to...

    Provided By National University Of Ireland

  • White Papers // Feb 2013

    Scalable Distributed Indexing and Query Processing over Linked Data

    Linked data is becoming the core part of modern web applications and thus efficient access to structured information expressed in RDF gains paramount importance. A number of efficient local RDF stores exist already, while distributed indexing and distributed query processing over linked data with similar efficiency and data management features...

    Provided By National University Of Ireland

  • White Papers // Nov 2013

    Complex Event Service Provision and Composition Based on Event Pattern Matchmaking

    Service computing has gained great success because it de-couples service providers and consumers. Because of this decoupling, it is possible to reuse software applications with-out knowing their implementation details. However, business applications consuming complex events (and complex event processing systems in general) are not taking such benefits from service computing,...

    Provided By National University Of Ireland

  • White Papers // Aug 2013

    Characterising Concepts of Interest Leveraging Linked Data and the Social Web

    Extracting and representing user interests on the social web is becoming an essential part of the web for personalization and recommendations. Such personalization is required in order to provide an adaptive web to users, where content fits their preferences, background and current interests, making the web more social and relevant....

    Provided By National University Of Ireland