Pubs:2009

<bibtex> @inproceedings { type={inproceedings }, cite={468}, title={A Case Study on Merging Strategies for Authoring QoE-based Adaptive Hypermedia}, booktitle={ECTEL 2009}, year={2009}, month={09/2009}, abstract={This paper describes recent work on strategy merger development in the authoring process of adaptive hypermedia. The goal of a merging strategy is to break a complex adaptation decision into a number of simpler ones which may be reused more easily and applied in different orders. To demonstrate the proposed method we present an example case study and sample strategies written in the LAG language. The case study is based on a recently proposed model for Quality of Experience in e-learning. This model exposes the complex interaction between a number of factors affecting QoE and hence presents a good candidate for the application of a strategy merger. Finally some evaluation points are identified, a conclusion is drawn and next steps are outlined.}, keywords={LAG, Quality of Experience, Quality of Service, Multimedia Learning, Educational Adaptive Hypermedia, Adaptation, Strategy merger}, author={Scotton, J. and Moebs, S, and McManis, J. and Cristea, A.I.}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={470}, title={QoE-MOT – A Learner Quality of Experience- Oriented Authoring Tool}, booktitle={European Conference on Technology Enhanced Learning, A3H: 7th International Workshop on Authoring of Adaptive and Adaptable Hypermedia}, year={2009}, month={09/2009}, abstract={This paper introduces Quality of Experience My Online Teacher (QoE-MOT), a user quality of experience oriented version of the generic authoring tool MOT. QoE-MOT is an authoring tool which enables the creation of performance-aware adaptive courses, by adapting the educational content to the learner network conditions. MOT was developed based on LAOS, a complex five layer authoring model. In similar fashion, QoE-MOT was constructed following the QoE-LAOS, a learner quality of experience oriented authoring model. This paper illustrates how an adaptive educational course has been enhanced with performance oriented metadata and how this metadata and QoE parameters are used during the adaptation process.}, keywords={Authoring tool, Adaptive e-learning, LAOS, QoE, MOT, LAG}, author={Andreea Molnar and Cristina Hava Muntean}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={469}, title={Billing Issues when Accessing Personalised Educational Content}, booktitle={China-Ireland International Conference on Information and Communications Technologies (CIICT 2009)}, year={2009}, month={08/2009}, abstract={The increased affordability of mobile devices combined with the availability of the latest wireless technologies have made mobile devices an attractive tool for learning. Nowadays learners can choose between multiple wireless networks with different characteristics, belonging to the same or to different mobile operators. Unfortunately, the Internet billing plans are still difficult to predict and control by most users. This paper presents an algorithm which aims to determine the best network, from a list of available ones (in terms of price), for delivering the selected educational content.}, keywords={cost, mobile data billing plan, mobile learning, adaptive and personalised learning}, author={Andreea Molnar and Cristina Hava Muntean}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={261}, title={Performance Aware and Cost Oriented Adaptive e-Learning Framework}, booktitle={IADIS International Conference e-Learning}, year={2009}, month={06/2009}, abstract={Nowadays learners have access to multiple wireless networks from the same hand held device challenging them to choose the best network in terms of cost and performance. However, the Internet billing plans are still difficult to understand, predict and control by most users. This paper presents a user oriented adaptive e-learning framework which takes into consideration: (i) the learner profile when content adaptation is done, (ii) user device that can have multiple wireless connections with different characteristics, (iii) how much the learner is willing to pay, and (iv) the network delivery performance. The goal is to ensure that the learner gets educational content that best suits his/her profile and that content will be delivered over the network which assures the best delivery performance, maintaining also a small price for getting the requested information.}, keywords={adaptive and personalised e-learning, wireless connectivity, budget, framework, user modelling}, author={Andreea Molnar and Cristina Hava Muntean}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={260}, title={Enhancing Domain Model with Performance Oriented Metadata for Adaptive E-learning Systems }, booktitle={EdTech}, year={2009}, month={05/2009}, abstract={Due to the increasing complexity of web site navigation, but also as a response to the “one size fits all” approach, adaptation mechanisms have emerged and have started to be used by a large number of on-line educational systems. As educational content may be delivered though various types of networks that differ in characteristics and vary with the time, the quality of the transmitted information is affected. PAMAH (Performance-Aware Multimedia-based Adaptive Hypermedia) proposes to overcome this barrier by taking into consideration in the personalisation process not only the classic learner profile but also the performance of the network connection used by the learner, when rich media content is delivered. This paper focuses on presenting performance oriented metadata required for modelling the educational content and for enhancing the adaptation process. The goal is to provide a personalised media rich content suitable for the learner network connection. }, keywords={Adaptive and personalized e-learning, domain modelling, multimedia }, author={Andreea Molnar and Cristina Hava Muntean}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={254}, title={Smooth Adaptive Soft Handover Algorithm for Multimedia Streaming over Wireless Networks}, booktitle={IEEE Wireless Communications & Networking Conference (WCNC)}, year={2009}, month={04/2009}, abstract={Inter-network mobility is achieved by allowing a mobile node to change its point of attachment to the network while preserving connectivity to its corresponding nodes. }, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={256}, title={A Novel Adaptive Multimedia Delivery Algorithm for Increasing User Quality of Experience during Wireless and Mobile E-learning}, booktitle={IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)}, year={2009}, abstract={Multimedia content is distributed via all types of networks to viewers found in a variety of locations and using different types of devices. Increasing the performance of multimedia stream delivery requires overcoming many technological challenges, all of them having a direct effect on the user perceived quality of experience. The quality of experience influences in turn the quality of any e-learning process. This is as users in general and learners in particular are becoming increasingly quality-aware in their expectations. Therefore delivering a good quality video stream as a part of any e-learning process is very important. This paper proposes a new adaptive multimedia delivery algorithm which can be used in the context of e-learning. The Dynamic Quality Oriented Adaptation Scheme (D-QOAS) adapts the multimedia content sent based on both user preferences and network conditions, while adjusting dynamically its adaptation policy during delivery. Simulation results show that for different user profiles and various network conditions the improvement in end-user perceived quality is significant. Important benefits are obtained in terms of the total number of simultaneous users and in the link utilization, as well as in quality as measured by some video quality metrics.}, keywords={dynamic content adaptation, e-learning, multimedia, rate control, wireless networks}, author={Vasile Horia Muntean and Gabriel-Miro Muntean}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={449}, title={Analysis of Real-Time Multimedia Transmission over PR-SCTP with Failover Detection Delay & Reliablity Level Diffrential}, booktitle={IEEE International Conference on Communication Software & Networks}, year={2009}, abstract={The growing availability of different wireless access technologies provides the opportunity for real-time distribution of multimedia content using multi-homing technology. Investigating the behaviors and quality of such applications under heavy network load is necessary. This paper studies the effect of path failure detection threshold and reliability level on Stream Control Transmission Protocol Partial Reliability Extension (PR-SCTP) performance in symmetric and asymmetric path conditions respectively with different path loss rates. The platform Evalvid-SCTP implemented in the University of Delaware’s SCTP ns-2 module performs the emulation experiment.}, keywords={Real-time; PR-SCTP; Evalvid-SCTP}, author={C.Xu and E.Fallon and Y.Qiao and Gabriel-Miro Muntean and X.Li and A.Hanley}, </bibtex> <bibtex> @proceedings { type={proceedings }, cite={229}, title={Analysis of Transparent Mode IEEE 802.16j System Performance with varying Numbers of Relays and Associated Transmit Power}, year={2009}, abstract={In this paper, the system capacity of IEEE 802.16j systems operating in transparent mode is investigated under varying numbers of relays and associated transmit power. The study is based on an extended variant of an analytical model defined in previous work and used to determine the throughput gain that can be achieved under a max-min fairness constraint. The study finds that significant overall throughput gains can be achieved over 802.16e systems: 125% and 55% gain with and without spatial reuse, respectively. However, the overall throughput gain drops as the transmit power at the relays (RSs) decreases despite the fact that a greater number of concurrent transmissions can be achieved due to less interference among the RSs’ transmissions. Decreasing the transmit power at the RSs eventually leads to a significant reduction of the achievable throughput gain even though a large number of RSs are deployed in scenarios with or without spatial reuse.}, keywords={IEEE 802.16j, performance gain, transparent}, author={Vasken Genc and Sean Murphy and John Murphy}, </bibtex> <bibtex> @proceedings { type={proceedings }, cite={407}, title={An Adaptive Optimized RTO Algorithm for Multi-Homed Wireless Environments}, year={2009}, abstract={As a transport layer protocol SCTP uses end to end metrics, such as}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={343}, title={Bandwidth Allocation in DiffServ Enabled Ethernet Passive Optical Networks}, booktitle={IET Communications}, year={2009}, publisher={Performance Engineering Lab}, organization={Performance Engineering Lab}, abstract={Ethernet Passive Optical Networks (EPONs) have attracted consider-}, </bibtex> <bibtex> @proceedings { type={proceedings }, cite={472}, title={CLOPS: A DSL for Command Line Options}, year={2009}, abstract={Programmers often write custom parsers for the command line input of their programs. They do so, in part, because they believe that both their program’s parameterization and their option formats are}, </bibtex> <bibtex> @article { type={article }, cite={456}, title={Distributed Storage-Assisted Data-Driven Overlay Network for P2P VoD Services}, journal={IEEE Trans. on Broadcasting}, volume={55}, year={2009}, pages={1-10}, publisher={IEEE}, abstract={Providing VCR-like operations in Peer-to-Peer (P2P)}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={462}, title={Dynamic Switching Between Adaptive FEC Protocols For Multi-Source Streaming}, year={2009}, abstract={Multi-source streaming is essential for the design of a}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={463}, title={Interference Aware Relay Station Location Planning for IEEE 802.16j Mobile Multi-Hop Relay Networks}, booktitle={12th ACM International Conference on Modeling Analysis & Simulation of Wireless & Mobile Systems}, year={2009}, abstract={In this paper, an interference aware algorithm for multi-cell}, </bibtex> <bibtex> @proceedings { type={proceedings }, cite={467}, title={IEEE802.11k Enabled Adaptive Physical Carrier Sense Mechanism for Wireless Networks(K-APCS)}, year={2009}, abstract={The existence of hidden and exposed nodes can have a}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={259}, title={Learning Styles or Not? A Classroom Experience}, booktitle={EdTech 2009 - the Irish Educational Technology Users' Conference}, year={2009}, abstract={Secondary Teacher Assistant Researchers (STARs) is a program of Science}, </bibtex> <bibtex> @proceedings { type={proceedings }, cite={476}, title={Measurements and Evaluations for an IEEE 802.11a Based Carrier-Grade Multi-radio Wireless Mesh Network Deployment}, year={2009}, abstract={Although there currently exists a number of Wireless Local Area Network based mesh network deployments most have been deployed to provide best effort broadband Internet access. Consequently, they cannot meet the requirements of network operators in order to utilise these networks to offer carrier grade services. The goal of providing carrier grade services over a wireless mesh infrastructure requires high performance in terms of throughput and reliability. One way of achieving this increase in performance is to utilise multi-radio Mesh Nodes, however, due to the Physical Layer layer limitations of 802.11a this can have significant problems. This paper analyses these issues and investigates what performance can be expected when frequency multiplexing is considered. The results presented in this paper are based on real measurements taken from multi-radio Mesh Nodes and are evaluated using statistical algorithms. The main contribution of this paper is an analysis of the impact of the Adjacent Channel Interference effect in 802.11a based multi-radio Mesh Nodes.}, keywords={802.11a, Measurement, Multi- Radio, Wireless Mesh Network, Wireless LAN }, author={Sebastian Robitzsch and Christian Niephaus and John Fitzpatrick and Mathias Kretschmer}, </bibtex> <bibtex> @inbook { type={inbook }, cite={232}, title={Network Planning for IEEE 802.16j Relay Networks}, booktitle={WiMAX Network Planning and Optimization }, year={2009}, publisher={Auerbach Publications}, abstract={In this chapter, a problem formulation for determining optimal node location for Base Stations (BSs) and Relay Stations (RSs) in relay-based 802.16 networks is developed. A number of techniques are proposed to solve the resulting Integer Programming (IP) problem - these are compared in terms of the time taken to find a solution and the quality of the solution obtained. Finally, there is some analysis of the impact of the ratio of Base Station (BS)/Relay Station (RS) costs on the solutions obtained. Three techniques are studied to solve the IP problem: (1) a standard branch and bound mechanism, (2) an approach in which state space reduction techniques are applied in advance of the branch and bound algorithm and (3) a clustering approach in which the problem is divided into a number of sub-problems which are solved separately, followed by a final overall optimisation step. These different approaches were used to solve the problem. The results show that the more basic approach can be used to solve problems for small metropolitan areas; the state space reduction technique reduces the time taken to ¯nd a solution by about 50%. Finally, the clustering approach can be used to find solutions of approximately equivalent quality in about 30% of the time required in the first case. After the scalability tests were performed, some rudimentary experiments were performed in which the ratio of BS/RS cost was varied. The initial results show that for the scenarios studied, reducing the RS costs results in more RSs in the solution, while also decreasing the power required to communicate from the mobile device to its closest infrastructure node (BS or RS).}, keywords={relay planning}, author={Yang Yu and Vasken Genc and Sean Murphy and Liam Murphy}, editor={Y. Zhang}, </bibtex> <bibtex> @article { type={article }, cite={408}, title={Open Corpus Architecture for Personalised Ubiquitous e-Learning}, journal={Personal & Ubiquitous Computing }, volume={13}, year={2009}, pages={197-205}, publisher={Springer London}, abstract={As the e-learning area matures, there are a growing number of e-learning content providers that produce and distribute material that covers a large range of topics, differs in quality and is represented in various formats. Lately, different devices and various network technologies allow extensive user access to educational content almost anywhere, anytime and from any device. Ubiquitous e-learning has the potential to provide continuous and context-based, educational material to human learners anytime, anywhere and on any device. Since each person has different expectations related to the content, the performance of the delivery and display of that content, it is desirable for an ubiquitous e-learning environment to provide user-oriented personalisation of e-learning material. However very often there are multiple sources of e-learning material at various web locations (open corpus resources) that cover the same topic, but differ in terms of quality, formatting and even cost. It is very difficult for learners to select the content that best suits their interests and goals, characteristics of the device used and delivery network as well as their cost budget. This paper proposes an innovative ubiquitous e-learning environment called Performance-based E-learning Adaptive Cost-efficient Open Corpus frameworK (PEACOCK) that provides support for the selection and distribution of personalised e-learning rich media content (e.g. multimedia, pictures, graphics and text) to e-learners such as it will best suit users’ interests and goals, meet their formatting preferences and cost constraints, while considering the limitations introduced by the end-user devices and the delivery networks to the user. PEACOCK’s main goal is to maximise the users’ e-learning experience and increase their learning satisfaction and learning outcome. }, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={342}, title={Optimising Metropolitan Area Wireless Path Selection using Media Independent Handover}, booktitle={International Workshop on Cross Layer Design}, year={2009}, publisher={Performance Engineering Lab}, organization={Performance Engineering Lab}, abstract={The Stream Control Transmission Protocol (SCTP) is}, </bibtex> <bibtex> @article { type={article }, cite={244}, title={Performance-aware Replication of Distributed Pre-recorded IPTV Content}, journal={IEEE Transactions on Broadcasting Special Issue}, volume={(in press)}, year={2009}, pages={-}, publisher={IEEE}, abstract={Video recording in IPTV systems is a promising service that provides time-shifted services in relation to storing TV content closer to user devices such as set-top boxes. Existing approaches do not support collaboration between nodes which have correlated contents, a fact that can affect the performance of the overall system. To make this service more interactive and proactive, this paper presents the architecture using the Smart Personal Information Network (Smart PIN) as a novel performance-based content sharing network for IPTV content which uses a user-centric utility-based Multimedia Data Replication Scheme (MDRS). This allows the exchange of data based on both network performance and user interest in exchanged multimedia content in order to achieve ef?cient content sharing. The proposed solution is evaluated through extensive simulations and results show much improved behaviour in comparison with two other existing general purpose data replicat on schemes.}, keywords={IPTV, Data replication, Content management, Peer-to-peer}, author={Seung-Bum Lee and Gabriel-Miro Muntean and Alan F. Smeaton}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={341}, title={Run-Time Correlation Engine for System Monitoring & Testing}, booktitle={IEEE International Conference on Autonomic Computing(ICAC-09)}, year={2009}, publisher={Performance Engineering Lab}, organization={Performance Engineering Lab}, abstract={Today’s enterprise applications can produce vast amounts of information}, </bibtex> <bibtex> @article { type={article }, cite={253}, title={SASHA - A Quality-Oriented Handover Algorithm for Multimedia Content Delivery to Mobile Users}, journal={IEEE Transactions on Broadcasting Special Issue}, volume={(in press)}, year={2009}, pages={-}, publisher={IEEE}, abstract={The convergence of the existing network access technologies to a common IP-based architecture and the increase in popularity of accessing video content over the Internet makes IPTV a promising solution for media and entertainment industries. Additionally, video content delivery to the increasingly popular mobile devices over heterogeneous wireless networks makes IPTV even more appealing. However the distribution of multimedia content over heterogeneous wireless networks to mobile devices involves significant technical challenges related to mobility management and quality of service provisioning. The existing solutions do not consider quality of service as a decision making parameter for mobility management in general and handover management in particular. }, </bibtex> <bibtex> @article { type={article }, cite={475}, title={Supporting carrier grade services over wireless mesh networks: The approach of the European FP-7 STREP CARMEN [Very Large Projects]}, journal={IEEE Communications Magazine}, volume={47}, year={2009}, pages={14-16}, publisher={IEEE}, abstract={CARMEN is a three-year Specific Targeted Research Project (STREP) funded by the European Commission within the 7th Framework Program. The CARMEN access network will complement existing access technologies by exploiting low cost mesh networking techniques, thus minimizing deployment and maintenance costs. The CARMEN architecture introduces an abstraction layer that hides the specifics of the underlying access technology providing an abstract interface on top of which higher layers can be easily developed. This allows for the integration of current and future heterogeneous wireless technologies to provide scalable and efficient mobile ubiquitous Internet access, able to adapt to different environments and user requirements. Following these goals, CARMEN aims to define, study and implement link and technology abstractions, mobility support, and quality of service. The architecture also includes advanced monitoring features that allow for dynamic self-configuration, thereby reducing the installation and operational costs.}, keywords={CARMEN, Specific Targeted Research Project, carrier grade services, metropolitan areas, wireless mesh networks }, author={Arturo Azcorra and Thomas Banniza and David Chieng and John Fitzpatrick and Dirk von-Hugo and Marek Natkaniec and Sebastian Robitzsch and Frank Zdarsky}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={340}, title={System-Level Performance Evaluation of Multi-Cell Transparent Mode Relay 802.16j Systems}, booktitle={IEEE Globecom 2009}, year={2009}, publisher={Performance Engineering Lab}, organization={Performance Engineering Lab}, abstract={In this paper, the system capacity of a multi-cell}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={460}, title={Seamless Handover of IPTV Streams in a Wireless LAN Network}, year={2009}, abstract={A robust mechanism to enable seamless handover of}, </bibtex> <bibtex> @article { type={article }, cite={339}, title={Transmission Scheduling for Multihomed Transport Protocols with Network Failure Tolerance}, journal={Telecommunication Systems Journal}, volume={40}, year={2009}, pages={10 pages}, publisher={Springer Netherlands}, abstract={In heterogeneous network environments, the}, </bibtex> <bibtex> @article { type={article }, cite={338}, title={Using Cross-Layer Metrics to Improve the Performance of End-to-End Handover Mechanisms}, journal={Computer Communication Preprint Online}, volume={10.1016}, year={2009}, pages={13 Pages}, publisher={Elsevier}, abstract={Network centric handover solutions for all IP wireless networks usually require modifications to network}, </bibtex> <bibtex> @inproceedings { type={inproceedings }, cite={461}, title={Using 802.11 MAC Retransmission for Path Selection in Multi-Homed Transport Layer Protocols}, booktitle={IEEE Globecom}, year={2009}, abstract={The Stream Transmission Control Protocol(SCTP)is a transport layer protocol which can support mobility through its multi-homing feature. One of the key parameters used by SCTP to manage path selection is Retransmission Time Out(RTO).We illustrate that SCTP evaluation of underlying paths using end to end metrics,results is the calculation of excessive RTO for degraded wireless paths.}, keywords={SCTP,RTO,MAC Retransmissions,Mobility}, author={S.Fallon and P.Jacob and Y.Qiao and A.Hanley and L.Murphy}, </bibtex>