Dave Denieffe

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George K. # Zarifis

Aristotle University of Thessaloniki

Jo Tondeur

Vrije Universiteit Brussel

Sam Rocha

University of British Columbia

Donna Alvermann

The University of Georgia

Beth Ferri

Syracuse University

Simon McIntyre

The University of New South Wales

Armando Marques-Guedes

UNL - New University of Lisbon

Simon Springer

The University of Newcastle

Olav Eikeland

OsloMet—Oslo Metropolitan University

James McLeskey

University of Florida

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Papers by Dave Denieffe

Enabling models of Internet eXchange Points for developing contexts

Development Engineering

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Elastic everything — What of the developing world?

2017 IST-Africa Week Conference (IST-Africa)

Telecommunications along with cloud computing are in the process of a transformation towards a Cl... more Telecommunications along with cloud computing are in the process of a transformation towards a Cloud Integrated Network (CIN)[1] triggered by an elastic network in the form of two disruptive technologies Software Defined Networking (SDN) and Network Function Virtualisation (NFV). This project is considering how key infrastructure development at national level and changed Local SPs (LSP) network architectures and business models can deliver the CIN within the constraints of a developing country. A potential set of solutions will be developed through experimental simulations and system models to demonstrate how the CIN can be delivered by rural SPs in a developing nation. While the project is in its early stages, work at the Ugandan Internet eXchange Point (IXP) virtualising services, adding an Akamai Content Delivery Node (CDN) has demonstrated an increased demand and has necessitated a corresponding upgrade the core switches. An OpenStack orchestration laboratory has been built for experimentation with NFV orchestration and Virtual Infrastructure Manager (VIM) functions. A similar testbed will consider Open Source MANO (OSM) and the Open Network Automation Platform (ONAP) Projects. The project will develop potential architectures for the delivery of the CIN to the rural customers of LSPs as well as consider the need for eXchangelets in the future.

Optical telecommunications system and signal analysis using data-entropy and multiple-centroid data-scatter

Photonic Applications in Devices and Communication Systems, 2005

The data-entropy quality-budget developed by the authors is used as an alternative to the convent... more The data-entropy quality-budget developed by the authors is used as an alternative to the conventional power budget. The traditional power budget approach is not capable of providing a full analysis of a system with different noise types and specifically providing a measure of signal quality. The quality-budget addressed this issue by applying its dimensionless &amp;amp;amp;#x27;bit measure&amp;amp;amp;#x27; to integrate the analysis

A Non-Elevated Scheduling Solution for First Person Shooter Games in IEEE 802.11 Networks

Ieee Globecom 2007 Ieee Global Telecommunications Conference, Nov 1, 2007

... Brian Carrig School of Engineering Institute of Technology, Carlow Kilkenny Road, Carlow, Ire... more

A Congestion-Only Charging Mechanism for Multiplayer Gaming in Differentiated Services Networks

Ieee Globecom 2007 Ieee Global Telecommunications Conference, Nov 1, 2007

In future networks based on the Differentiated Services (DiffServ) architecture, users may be pro... more In future networks based on the Differentiated Services (DiffServ) architecture, users may be provided with the opportunity to choose their Assured Forwarding (AF) class. Users will attempt to maximize their Consumer Surplus (CS) in such an environment. Users can increase their CS by choosing a lower cost AF class-provided their Quality of Service (QoS) requirements are still satisfied. Previously the authors have proposed an algorithm known as Consumer Surplus Maximization (CSM) [1]. Although this algorithm can provide a CS improvement for users, widespread adoption of the algorithm could cause network instability. With many users switching between classes degradation on one AF class quickly propagates to other classes. The likelihood of such occurrences can be reduced by replacing fixed per-byte or per-packet charges associated with individual AF classes with a lightweight Congestion-only Charging (CoC) pricing mechanism. A charge is only applied to packets when they receive a discernible benefit from being marked as belonging to a particular class. We present simulation results from a networking scenario where users connect across a single DiffServ domain to engage in a multiplayer First Person Shooter (FPS) game.

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Review of 'New Managerialism in Education, Commercialization, Carelessness and Gender' K. Lynch, B. Grummell and D.Devine Palgrave MacMillan, 2012

Aishe J the All Ireland Journal of Teaching and Learning in Higher Education, Jun 26, 2013

A Multiplayer Games Priority Selection Strategy for Use in QoS-Aware Networks

Future Quality of Service (QoS) aware networks, such as those based on the Differentiated Service... more Future Quality of Service (QoS) aware networks, such as those based on the Differentiated Services (DiffServ) architecture, will provide users with the opportunity to prioritize the traffic they receive and generate. Different priorities will entail different per-byte or per-packet charges. To aid users operating within such an environment, a priority selection strategy is required. In this paper, we propose a priority selection strategy based on Consumer Surplus (CS), which is the difference between what the user is willing to pay (utility) and the actual cost. We then evaluate this strategy in a networking scenario where a user is involved in a multiplayer Counterstrike game, in which different priorities can be assigned to the downstream traffic. A utility curve, applicable to a First Person Shooter (FPS) game like Counterstrike, is presented. Using simulation results we show that for varied traffic loads, the CS strategy offers comparable application performance to that of always selecting the highest priority. However it does so at a reduced cost to the user..

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Congestion-only charging

The Fourth International Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness & Workshops - QSHINE '07, 2007

In networks based on the Differentiated Services (DiffServ) architecture, users may be presented ... more In networks based on the Differentiated Services (DiffServ) architecture, users may be presented the opportunity to choose their Assured Forwarding (AF) class. Users will attempt to maximize their Consumer Surplus (CS) in such an environment. They can increase their CS by choosing the lowest cost AF class that satisfies their Quality of Service (QoS) requirements. Previously the authors have proposed an algorithm known as Consumer Surplus Maximization (CSM) [2]. Although this algorithm improves CS for users, widespread adoption of the algorithm can provoke network instability. If many users switch classes at once, degradation on one AF class can easily propagate. The likelihood of such an occurrence can be reduced by replacing fixed perbyte or per-packet charges associated with individual AF classes with a lightweight Congestion-only Charging (CoC) pricing mechanism. An additional charge is only applied to packets that receive discernible benefit from belonging to a particular class. We present simulation results from a networking scenario where users connect across a single DiffServ domain to engage in a multiplayer First Person Shooter (FPS) game.

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Supporting First Person Shooter Games in Wireless Local Area Networks

2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007

First Person Shooter (FPS) games are a popular online gaming genre played predominately over wire... more First Person Shooter (FPS) games are a popular online gaming genre played predominately over wired networks. FPS games are highly interactive and have stringent delay requirements. However, the explosive growth in wireless LAN (WLAN) deployment has seen an increase in the use of such networks for gaming purposes. The varied performance of the IEEE 802.11 MAC Distributed Coordination Function (DCF) has tended to make WLANs unsuitable for FPS games. The IEEE 802.11e standard introduces Quality of Service (QoS) mechanisms including Enhanced Distributed Channel Access (EDCA) allowing prioritization of competing flows. Using the NS-2 simulator, we evaluate the capability of 802.11g and 802.11e WLANs to support Quake IV games traffic in the presence of web traffic. We compare the results achieved using EDCA with those achieved by a non-elevated differentiated services scheduler known as Best Effort with Loss Trade-off (BELT). We find that the BELT scheduler compares favorably with EDCA in this context.

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A Non-Elevated Scheduling Solution for First Person Shooter Games in IEEE 802.11 Networks

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007

... Brian Carrig School of Engineering Institute of Technology, Carlow Kilkenny Road, Carlow, Ire... more

A relative delay minimization scheme for multiplayer gaming in differentiated services networks

Proceedings of 5th ACM SIGCOMM workshop on Network and system support for games - NetGames '06, 2006

Multiplayer gaming over the Internet continues to grow in popularity, despite a lack of Quality o... more Multiplayer gaming over the Internet continues to grow in popularity, despite a lack of Quality of Service (QoS) mechanisms. Future QoS-aware networks such as those based on the Differentiated Services (DiffServ) framework will provide an opportunity for gamers to enhance their game-playing experience. An important QoS metric for networked games is a user's delay relative to the delay of other users. In this paper, we propose a Relative Delay Minimization (RDM) algorithm for use in DiffServ environments. Simulation results are described and presented showing that the algorithm can reduce the Relative Delay Variation (RDV) between users in a DiffServ environment.

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Influence of mobile user velocity on data transfer in a multi-network wireless environment

2007 9th IFIP International Conference on Mobile Wireless Communications Networks, 2007

Heterogeneous wireless environments are now a reality in many urban areas. Designing and deployin... more Heterogeneous wireless environments are now a reality in many urban areas. Designing and deploying a wireless network in such an environment is complicated by the unpredictable propagation paths of radio signals and by the unpredictable behaviour of the network users themselves. Network simulation and modelling can be used to assist in the design process. However, in order for simulation models to be effective they must be realistic. Efforts have been made to render simulation models more realistic through the analysis of real world wireless networks and through the examination and evaluation of existing simulation models. The most fundamental characteristics of a mobile user are their mobility, and the speed at which they move. The various velocities used in simulation models are unrealistic with respect to pedestrian behaviour in urban environments. In addition, the possible influence of mobile user velocity on the amount of data transferred by the user is not considered. In this paper we examine the influence of a mobile user's velocity on throughput in a wireless network using a range of realistic velocities.

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Prompt Gamma Activation Analysis of Impurity and Elemental Stability for Two SU-8 Organic Polymer Samples Having Different Solidification Pretreatment

The Open Inorganic Chemistry Journal, 2009

In this paper, two samples of SU-8, a photo polymer consisting of Gamma-Butyrolactone (GLB) mixed... more In this paper, two samples of SU-8, a photo polymer consisting of Gamma-Butyrolactone (GLB) mixed with both Triarylsulfonia and Hexafluroantimonate considered for a Prompt Gamma Activation Analysis (PGAA) diagnostic study. The SU-8 was formed into two organic polymer microturbines which were then given different solidification pretreatment using varying durations of heat baking and UltraViolet (UV) crosslinking. In addition to determining the major components of the analyzed samples, some trace elements were also identified, and all the compositions were compared. The measurements were performed at the Budapest Research Reactor (BRR). The obtained results have advanced the industrial applicability of the adopted technique in the considered sector of polymer analysis, because the PGAA has been applied in the case of the polymer of the microturbines. The results obtained are complementary to data achieved by other techniques.

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A Congestion-Only Charging Mechanism for Multiplayer Gaming in Differentiated Services Networks

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007

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The Impact of Network-Based Parameters on Gamer Experience

Encyclopedia of Information Science and Technology, Second Edition, 2009

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A User-Controlled Priority Selection Strategy for Multiplayer Games

2007 4th IEEE Consumer Communications and Networking Conference, 2007

Future Quality of Service (QoS) aware networks, such as those based on the Differentiated Service... more Future Quality of Service (QoS) aware networks, such as those based on the Differentiated Services (DiffServ) architecture, will provide users with the opportunity to assign a priority to the traffic they receive and generate. Different priorities will entail different per-byte or per-packet charges. To aid users operating within such an environment, a priority selection strategy is required. In this paper, we propose a priority selection strategy based on the concept of Consumer Surplus (CS), which is the positive difference between utility or the user's willingness-to-pay and cost. We then evaluate this strategy in a networking scenario where a user is involved in a multiplayer Counterstrike game, in which different priorities may be assigned to the downstream traffic. A utility curve, applicable to a First Person Shooter (FPS) game like Counterstrike, is presented. Using simulation results we show that for varied traffic loads, the CS strategy offers comparable application performance to that of always selecting the highest priority, but at a reduced cost to the user.

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A Game Assessment Metric for the Online Gamer

Advances in Electrical and Computer Engineering, 2007

This paper describes a new game assessment metric for the online gamer. The metric is based on a ... more This paper describes a new game assessment metric for the online gamer. The metric is based on a mathematical model currently used for network planning assessment. Beside the traditional network-based parameters such as delay, jitter and packet loss, new parameters based on online players' game experience/knowledge are introduced. The metric aims to estimate game quality as perceived by an online player. Measurements can be achieved in real-time or near real-time and could be useful to both online game players and game service providers. In order to validate and calibrate the proposed metric a subjective game quality assessment is also proposed. Two 5-point scales are introduced: a gamequality scale and a game playing-effort scale. The mean average of each scales termed, as Mean Opinion Score (MOS), will indicate the game quality (MOS GQE) and the playing-effort required (MOS GPE). The results obtained using subjective tests are divided in two parts. The first part is used during the development and calibration of the proposed objective algorithm. The second part is used to validate the proposed algorithm. The algorithm's performance can be measured using Pearson correlation between the subjective and objective MOS GQE scores.

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$Research paper thumbnail of <title>A new data diffraction method for digital signal analysis and optoelectronic-fiber system-digital design</title>$

<title>A new data diffraction method for digital signal analysis and optoelectronic-fiber system-digital design</title>

Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, 2005

For the first time the term data diffraction is introduced, with examples drawn from the algorith... more For the first time the term data diffraction is introduced, with examples drawn from the algorithm known as phase coherent data-scatter (PCDS) that produces identifiable visual patterns for different types of signal degradation in optical telecommunications. The main signal degradation factors that affect the performance of optical fibers include attenuation, rise-times and dispersion. The theory behind data-scatter is introduced including

<title>Applying new data-entropy and data-scatter methods for optical digital signal analysis</title>

Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, 2005

This paper introduces for the first time a numerical example of the data-entropy &amp;amp;amp... more This paper introduces for the first time a numerical example of the data-entropy &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;quality-budget&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; method. The paper builds on an earlier theoretical investigation into the application of this information theory approach for opto-electronic system engineering. Currently the most widely used way of analysing such a system is with the power budget. This established method cannot however integrate noise of different

Subjective-based quality assessment for online games

Proceedings of the 3rd International ICST Conference on Simulation Tools and Techniques, 2010

... Dorel Picovici Institute of Technology Carlow Kilkenny Road, Ireland + 353 59 9175438 Dorel.P... more

Enabling models of Internet eXchange Points for developing contexts

Development Engineering

Download

Elastic everything — What of the developing world?

2017 IST-Africa Week Conference (IST-Africa)

Optical telecommunications system and signal analysis using data-entropy and multiple-centroid data-scatter

Photonic Applications in Devices and Communication Systems, 2005

A Non-Elevated Scheduling Solution for First Person Shooter Games in IEEE 802.11 Networks

Ieee Globecom 2007 Ieee Global Telecommunications Conference, Nov 1, 2007

... Brian Carrig School of Engineering Institute of Technology, Carlow Kilkenny Road, Carlow, Ire... more

A Congestion-Only Charging Mechanism for Multiplayer Gaming in Differentiated Services Networks

Ieee Globecom 2007 Ieee Global Telecommunications Conference, Nov 1, 2007

Download

Review of 'New Managerialism in Education, Commercialization, Carelessness and Gender' K. Lynch, B. Grummell and D.Devine Palgrave MacMillan, 2012

Aishe J the All Ireland Journal of Teaching and Learning in Higher Education, Jun 26, 2013

A Multiplayer Games Priority Selection Strategy for Use in QoS-Aware Networks

Download

Congestion-only charging

The Fourth International Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness & Workshops - QSHINE '07, 2007

Download

Supporting First Person Shooter Games in Wireless Local Area Networks

2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007

Download

A Non-Elevated Scheduling Solution for First Person Shooter Games in IEEE 802.11 Networks

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007

... Brian Carrig School of Engineering Institute of Technology, Carlow Kilkenny Road, Carlow, Ire... more

A relative delay minimization scheme for multiplayer gaming in differentiated services networks

Proceedings of 5th ACM SIGCOMM workshop on Network and system support for games - NetGames '06, 2006

Download

Influence of mobile user velocity on data transfer in a multi-network wireless environment

2007 9th IFIP International Conference on Mobile Wireless Communications Networks, 2007

Download

Prompt Gamma Activation Analysis of Impurity and Elemental Stability for Two SU-8 Organic Polymer Samples Having Different Solidification Pretreatment

The Open Inorganic Chemistry Journal, 2009

Download

A Congestion-Only Charging Mechanism for Multiplayer Gaming in Differentiated Services Networks

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007

Download

The Impact of Network-Based Parameters on Gamer Experience

Encyclopedia of Information Science and Technology, Second Edition, 2009

Download

A User-Controlled Priority Selection Strategy for Multiplayer Games

2007 4th IEEE Consumer Communications and Networking Conference, 2007

Future Quality of Service (QoS) aware networks, such as those based on the Differentiated Service... more Future Quality of Service (QoS) aware networks, such as those based on the Differentiated Services (DiffServ) architecture, will provide users with the opportunity to assign a priority to the traffic they receive and generate. Different priorities will entail different per-byte or per-packet charges. To aid users operating within such an environment, a priority selection strategy is required. In this paper, we propose a priority selection strategy based on the concept of Consumer Surplus (CS), which is the positive difference between utility or the user's willingness-to-pay and cost. We then evaluate this strategy in a networking scenario where a user is involved in a multiplayer Counterstrike game, in which different priorities may be assigned to the downstream traffic. A utility curve, applicable to a First Person Shooter (FPS) game like Counterstrike, is presented. Using simulation results we show that for varied traffic loads, the CS strategy offers comparable application performance to that of always selecting the highest priority, but at a reduced cost to the user.

Download

A Game Assessment Metric for the Online Gamer

Advances in Electrical and Computer Engineering, 2007

Download

$Research paper thumbnail of <title>A new data diffraction method for digital signal analysis and optoelectronic-fiber system-digital design</title>$

<title>A new data diffraction method for digital signal analysis and optoelectronic-fiber system-digital design</title>

Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, 2005

<title>Applying new data-entropy and data-scatter methods for optical digital signal analysis</title>

Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, 2005

Subjective-based quality assessment for online games

Proceedings of the 3rd International ICST Conference on Simulation Tools and Techniques, 2010

... Dorel Picovici Institute of Technology Carlow Kilkenny Road, Ireland + 353 59 9175438 Dorel.P... more

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