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Bridging UMTS and multicast routing in ns-2 1

Bridging UMTS and multicast routing in ns-2

1st International ICST Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SIMUTools 2008

作者： Alexiou, Antonios Bouras, Christos Papazois, Andreas Research Academic Computer Technology Institute Computer Engineering and Informatics Department University of Patras PatrasGR 26500 Greece Computer Engineering and Informatics Department University of Patras PatrasGR 26500 Greece

ISBN: (纸本)9789639799233

In this paper, we present the design and the implementation of a novel scheme for the multicast transmission of data over Universal Mobile Telecommunications System (UMTS) networks. The proposed scheme is implemented as an ns-2 network simulator module which can be employed to investigate various aspects of UMTS multicast. Apart from the normal multicast transmission over UMTS, we consider the handling of exceptional cases induced by user mobility scenarios. The proposed scheme is in accordance with the current specifications of the Multimedia Multicast/Broadcast Service (MBMS) defined by the 3rd Generation Partnership Project (3GPP) and introduces minor modifications in the UMTS architecture and the mobility management mechanisms. The performance of the proposed scheme is validated and analyzed through simulation experiments. Finally, the simulation results are presented along with their analysis. Copyright © 2008 ICST.

关键词： Universal Mobile Telecommunications System

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MokE: A tool for Mobile-ok evaluation of web content 08

MokE: A tool for Mobile-ok evaluation of web content

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W4A'08: 2008 International Cross-Disciplinary Conference on Web Accessibility, W4A

作者： Garofalakis, John Stefanis, Vassilios University of Patras Computer Engineering and Informatics Department 26500 Patras Greece Computer Technology Institute 26500 Patras Greece

ISBN: (纸本)9781605581538

The ever-growing corpus of web content is now accessible from mobile devices. But is web content ready for mobile access? Which characteristics provide an acceptable user experience when using a mobile device? Based on W3C's MobileOK best practices and tests we present MokE (Mobile OK Evaluator), a tool that helps creators of web content, webmasters and site administrators to evaluate how a mobile user will experience browsing of their content. By making use of W3C's basic tests this tool is comprised of a set of modules that crawl a web site, analyze its content (including a hidden web capability) and provide an evaluation of its appropriateness for mobile access.

关键词： Websites

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Improving the accuracy of neuro-symbolic rules with case-based reasoning

Improving the accuracy of neuro-symbolic rules with case-bas...

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1st International Workshop on Combinations of Intelligent Methods and Applications, CIMA 2008

作者： Prentzas, Jim Hatzilygeroudis, Ioannis Michail, Othon Technological Educational Institute of Lamia Department of Informatics and Computer Technology 35100 Lamia Greece University of Patras Dept of Computer Engineering and Informatics 26500 Patras Greece

In this paper, we present an improved approach integrating rules, neural networks and cases, compared to a previous one. The main approach integrates neurules and cases. Neurules are a kind of integrated rules that combine a symbolic (production rules) and a connectionist (adaline unit) representation. Each neurule is represented as an adaline unit. The main characteristics of neurules are that they improve the performance of symbolic rules and, in contrast to other hybrid neuro-symbolic approaches, retain the modularity of production rules and their naturalness in a large degree. In the improved approach, various types of indices are assigned to cases according to different roles they play in neurule-based reasoning, instead of one. Thus, an enhanced knowledge representation scheme is derived resulting in accuracy improvement. Experimental results demonstrate its effectiveness.

关键词： Case based reasoning

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Combinations of case-based reasoning with other intelligent methods

Combinations of case-based reasoning with other intelligent ...

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1st International Workshop on Combinations of Intelligent Methods and Applications, CIMA 2008

作者： Prentzas, Jim Hatzilygeroudis, Ioannis Technological Educational Institute of Lamia Department of Informatics and Computer Technology 35100 Lamia Greece University of Patras Dept of Computer Engineering and Informatics 26500 Patras Greece

Case-based reasoning is a popular approach used in intelligent systems. Whenever a new case has to be dealt with, the most similar cases are retrieved from the case base and their encompassed knowledge is exploited in the current situation. Combinations of case-based reasoning with other intelligent methods have been explored deriving effective knowledge representation schemes. Although some types of combinations have been mostly explored, other types have not been thoroughly investigated. In this paper, we briefly outline popular case-based reasoning combinations. More specifically, we focus on combinations of case-based reasoning with rulebased reasoning, soft computing and ontologies. We illustrate basic types of such combinations and discuss future directions.

关键词： Case based reasoning

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Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sNN=2.76 TeV with the ATLAS Detector at the LHC

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Physical Review Letters 2010年第25期105卷 252303-252303页

作者： G. Aad B. Abbott J. Abdallah A. A. Abdelalim A. Abdesselam O. Abdinov B. Abi M. Abolins H. Abramowicz H. Abreu E. Acerbi B. S. Acharya M. Ackers D. L. Adams T. N. Addy J. Adelman M. Aderholz S. Adomeit P. Adragna T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Aharrouche S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. V. Akimov M. S. Alam M. A. Alam S. Albrand M. Aleksa I. N. Aleksandrov M. Aleppo F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison M. Aliyev P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso J. Alonso M. G. Alviggi K. Amako P. Amaral C. Amelung V. V. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos T. Andeen C. F. Anders K. J. Anderson A. Andreazza V. Andrei M-L. Andrieux X. S. Anduaga A. Angerami F. Anghinolfi N. Anjos A. Annovi A. Antonaki M. Antonelli S. Antonelli J. Antos F. Anulli S. Aoun L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce J. P. Archambault S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster K. E. Arms S. R. Armstrong O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai J. Silva R. Asfandiyarov S. Ask B. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov G. Atoian B. Aubert B. Auerbach E. Auge K. Augsten M. Aurousseau N. Austin R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas G. Bachy M. Backes E. Badescu P. Bagnaia S. Bahinipati Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker S Baker F. Baltasar Dos Santos Pedrosa E. Banas P. Banerjee Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov A. Barashkou A. Barbaro Galtieri T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton D. Bartsch R. L. Bates L. Batkova J. R. Batley A. Battaglia M. Albert-Ludwigs-Universität Fakultät für Mathematik und Physik Hermann-Herder Strasse 3 D-79104 Freiburg i.Br. Germany University of Oklahoma Homer L. Dodge Department of Physics and Astronomy 440 West Brooks Room 100 Norman Oklahoma 73019-0225 USA Institut de Física d’Altes Energies IFAE Edifici Cn Universitat Autònoma de Barcelona ES-08193 Bellaterra (Barcelona) Spain Université de Genève Section de Physique 24 rue Ernest Ansermet CH-1211 Geneve 4 Switzerland Oxford University Department of Physics Denys Wilkinson Building Keble Road Oxford OX1 3RH United Kingdom Institute of Physics Azerbaijan Academy of Sciences H. Javid Avenue 33 AZ 143 Baku Azerbaijan Oklahoma State University Department of Physics 145 Physical Sciences Building Stillwater Oklahoma 74078-3072 USA Michigan State University Department of Physics and Astronomy High Energy Physics Group East Lansing Michigan 48824-2320 USA Tel Aviv University Raymond and Beverly Sackler School of Physics and Astronomy Ramat Aviv IL - Tel Aviv 69978 Israel LAL Université Paris-Sud IN2P3/CNRS Orsay France INFN Sezione di Milano via Celoria 16 IT-20133 Milano Italy Università di Milano Dipartimento di Fisica via Celoria 16 IT-20133 Milano Italy INFN Gruppo Collegato di Udine Strada Costiera 11 IT-33100 Udine Italy ICTP Strada Costiera 11 IT-34014 Trieste Italy University of Bonn Physikalisches Institut Nussallee 12 D-53115 Bonn Germany Brookhaven National Laboratory Physics Department Building 510A Upton New York 11973 USA Hampton University Department of Physics Hampton Virginia 23668 USA Yale University Department of Physics P.O. Box 208121 New Haven Connecticut 06520-8121 USA Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) Föhringer Ring 6 80805 München Germany Ludwig-Maximilians-Universität München Fakultät für Physik Am Coulombwall 1 DE-85748 Garching Germany Queen Mary University of London Department of Physics Mile End Road London E1 4NS United Kingdom Ruther

By using the ATLAS detector, observations have been made of a centrality-dependent dijet asymmetry in the collisions of lead ions at the Large Hadron Collider. In a sample of lead-lead events with a per-nucleon center of mass energy of 2.76 TeV, selected with a minimum bias trigger, jets are reconstructed in fine-grained, longitudinally segmented electromagnetic and hadronic calorimeters. The transverse energies of dijets in opposite hemispheres are observed to become systematically more unbalanced with increasing event centrality leading to a large number of events which contain highly asymmetric dijets. This is the first observation of an enhancement of events with such large dijet asymmetries, not observed in proton-proton collisions, which may point to an interpretation in terms of strong jet energy loss in a hot, dense medium.

关键词： Energy dissipation

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TRAILS, a Toolkit for Efficient, Realistic and Evolving Models of Mobility, Faults and Obstacles in Wireless Networks

TRAILS, a Toolkit for Efficient, Realistic and Evolving Mode...

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Annual Symposium on Simulation

作者： Ioannis Chatzigiannakis Athanasios Kinalis Georgios Mylonas Sotiris Nikoletseas Grigoris Prasinos Christos Zaroliagis Computer Technology Institute (CTI) Department of Computer Engineering and Informatics University of Patras Patras Greece

We present a new simulation toolkit called TRAILS (Toolkit for Realism and Adaptivity In Large-scale Simulations), which extends the ns-2 simulator by adding important functionality and optimizing certain critical simulator operations. The added features provide the tools to study wireless networks of high dynamics. TRAILS facilitates the implementation of advanced mobility patterns, obstacle presence and disaster scenarios, and failures injection that can dynamically change throughout the execution of the simulation. Moreover, we define a set of utilities that enhance the use of ns-2. This functionality is implemented in a simple and flexible architecture, that follows design patterns, object oriented and generic programming principles, maintaining a proper balance between reusability, extendability and ease of use. We evaluate the performance of TRAILS and show that it offers significant speed-ups regarding the execution time of ns-2 in certain important, common wireless settings. Our results also show that this is achieved with minimum overhead in terms of memory usage.

关键词： Wireless networks Object oriented modeling Computational modeling Wireless sensor networks Statistics Contracts Protocols Large-scale systems Mobile ad hoc networks computer simulation

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A progress report and a proposal: Interactivity in ubiquitous learning enhanced by virtual tutors in e-learning contents

A progress report and a proposal: Interactivity in ubiquitou...

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2008 IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing, SUTC 2008

作者： Yamamoto, Toshiyuki Miyashita, Ryo Department of Media Informatics Kanazawa Institute of Technology Japan Graduate Program in Information and Computer Engineering Kanazawa Institute of Technology Japan

ISBN: (纸本)9780769531588

It is proposed in this session that the interactivity necessary in ubiquitous learning can be enhanced by the virtual tutor who mediates between the learner and the e-Learning contents. Arousing students' intellectual curiosity and raising their motivation to learn are the two great goals for e-Learning contents developers. It is supposed that the interaction in the communication between the teacher and his/her students in a regular classroom can be maintained in e-Learning with the help of Virtual Tutor, which appears on the learning contents in a timely fashion to give learners advice, encouragement, reminders, and such. The session includes discussions to develop such a system making use of the most updated technology as well as demonstrations of such a system which has been experimented at department of Media informatics. It is proved that the learning environment where human interactivity is essential can be reconstructed in terms of the proposed Virtual Tutor. This paper presentation includes demonstrations of QED as well as a discussion of the importance of interactivity in ubiquitous e-Learning. © 2008 IEEE.

关键词： Students

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A general analytical method for the performance evaluation of multistage interconnection networks supporting multi-class priority traffic

A general analytical method for the performance evaluation o...

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4th Advanced International Conference on Telecommunications, AICT 2008

作者： Garofalakis, John Stergiou, Eleftherios Department of Computer Engineering and Informatics University of Patras Research Academic Computer Technology Institute Patras Greece Department Teleinformatics and Communication ATEI of Epirus Arta Greece

ISBN: (纸本)9780769531625

In this paper, our investigation focuses on the performance evaluation of Omega multistage interconnection networks which can natively support multi-class priority traffic. For this reason, a multibuffered, single server switching element is presented and used in the construction of those networks, providing thus better quality of services. The performance evaluation model is based on steady state queuing analysis that leads to a novel utilization's formula. Based on the proposed analysis, other major performance indicators can also be accurately calculated. The analytical method was meticulously validated by classic simulation and a part of obtained results was also compared by existing related work. Moreover, the proposed analytical method was found to be very accurate on performance estimations for various network sizes under different offered loads supporting multi-priority traffic. The rationale behind investigating a multi-priority traffic system is to provide efficient networks supporting optimum quality of services (i.e. streaming media vs. file transfer). © 2008 IEEE.

关键词： Media streaming

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A 6/5-approximation algorithm for the maximum 3-cover problem

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33rd International Symposium on Mathematical Foundations of computer Science, MFCS 2008

作者： Caragiannis, Ioannis Monaco, Gianpiero Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras 26500 Rio Greece Department of Computer Science University of L'Aquila Via Vetoio Coppito 67100 L'Aquila Italy

ISBN: (纸本)3540852379

In the maximum cover problem, we are given a collection of sets over a ground set of elements and a positive integer w, and we are asked to compute a collection of at most w sets whose union contains the maximum number of elements from the ground set. This is a fundamental combinatorial optimization problem with applications to resource allocation. We study the simplest APX-hard variant of the problem where all sets are of size at most 3 and we present a 6/5-approximation algorithm, improving the previously best known approximation guarantee. Our algorithm is based on the idea of first computing a large packing of disjoint sets of size 3 and then augmenting it by performing simple local improvements. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Approximation algorithms

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Simulation of Agilla middleware on TOSSIM 1

Simulation of Agilla middleware on TOSSIM

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1st International ICST Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SIMUTools 2008

作者： Özarslan, S. Erten, Y.M. Informatics Institute Middle East Technical University Ankara06531 Turkey Computer Engineering Department University of Economics and Technology Ankara06560 Turkey

ISBN: (纸本)9789639799233

In this study, we performed a simulation of mobile agents running on Agilla middleware designed for sensor networks. The simulations are performed using TOSSIM assuming that Agilla middleware is installed on the sensor nodes which are running TinyOS operating system. We simulated different agents corresponding to various functions and measured the time it takes for these agent software to run in the simulated environment and compared these results with those obtained using actual sensor nodes. The results presented in the study show that simulations produce results comparable to real life experiments. Copyright © 2008 ICST.

关键词： Mobile agents

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