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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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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 new upper bound for 3-SAT

A new upper bound for 3-SAT

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28th International Conference on the Foundations of Software technology and Theoretical computer Science, FSTTCS 2008

作者： Díaz, J. Kirousis, L. Mitsche, D. Pérez-Gimenez, X. Llenguatges i Sistemes Informatics UPC E-08034 Barcelona Spain RA Computer Technology Institute GR-26504 Rio Patras Greece Computer Engineering and Informatics University of Patras GR-26504 Rio Patras Greece

ISBN: (纸本)9783939897088

We show that a randomly chosen 3-CNF formula over n variables with clauses-to-variables ratio at least 4.4898 is asymptotically almost surely unsatisfiable. The previous best such bound, due to Dubois in 1999, was 4.506. The first such bound, independently discovered by many groups of researchers since 1983, was 5.19. Several decreasing values between 5.19 and 4.506 were published in the years between. The probabilistic techniques we use for the proof are, we believe, of independent interest. © Díaz, Kirousis, Mitsche, Pérez-Giménez.

关键词： 3-SAT random Satisfiability Threshold

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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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Hardware principles for the design of a stereo-matching state machine based on dynamic programming

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Journal of engineering Science and technology Review 2008年第1期1卷 19-24页

作者： Kalomiros, J.A. Lygouras, J. Department of Informatics and Communications School of Technological Applications Serres Institute of Education and Technology Terma Magnisias 62100 Serres Greece Section of Electronics and Information Systems Technology Department of Electrical Eng. and Computer Eng. School of Engineering Democritus University of Thrace Xanthi Greece

This paper presents basic design principles for hardware implementation of a two-pass stereo-matching algorithm based on dynamic programming. For the first-pass a state-machine is proposed for the recursive calculation of the cost-function. The state-machine works along the diagonal of a 2-D disparity space for each epipolar pair of image scan-lines. On-chip local raM stores tags that denote the minimum transition cost to every point in the disparity space among possible costs from all three neighboring points. All calculations are within a pre-determined useful disparity range. For the second pass, hardware rules are presented that produce the correct disparity per pixel, by backtracking stored cost values. Hardware stages are structured along a fully parallel pipeline, that outputs disparities in step with the input serial pixel stream at clock rate. © 2008 Kavala institute of technology.

关键词： Dynamic programming

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Extending the functionality of RTP/RTCP implementation in network simulator (NS-2) to support TCP friendly congestion control 1

Extending the functionality of RTP/RTCP implementation in ne...

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

作者： Bouras, Christos Gkamas, Apostolos Kioumourtzis, Georgios Research Academic Computer Technology Institute University of Patras N. Kazantzaki Str. Rion26500 Greece University of Patras Department of Computer Engineering and Informatics Rion Patras26500 Greece

ISBN: (纸本)9789639799233

In this paper, we present a modification of the ns2 code for the RTP/RTCP protocols. The legacy RTP/RTCP code in ns2 has not yet been validated but it provides a framework of the protocol's specification for experimental use. We have modified the code by adding all the RTP/RTCP protocol's attributes that are defined in RFC 3550 and related to QoS metrics. We have also implemented additional algorithms and functions in order to enhance our modified code with TCP friendly bandwidth share behavior. Our protocol, named RTPUP ("UP" stands for the University of Patras), is offered as a package and is fully documented so that it can be used for simulations and research within the ns2 simulation environment. Copyright © 2008 ICST.

关键词： Transmission control protocol

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Robust line planning under unknown incentives and elasticity of frequencies

Robust line planning under unknown incentives and elasticity...

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8th Workshop on Algorithmic Approaches for Transportation Modeling, Optimization, and Systems, ATMOS 2008

作者： Kontogiannis, Spyros Zaroliagis, Christos R.A. Computer Technology Institute Patras University Campus N. Kazantzaki Str. 26500 Patras Greece Computer Science Department University of Ioannina Ioannina Greece Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece

ISBN: (纸本)9783939897071

The problem of robust line planning requests for a set of origin-destination paths (lines) along with their traffic rates (frequencies) in an underlying railway network infrastructure, which are robust to fluctuations of real-time parameters of the solution. In this work, we investigate a variant of robust line planning stemming from recent regulations in the railway sector that introduce competition and free railway markets, and set up a new application scenario: there is a (potentially large) number of line operators that have their lines fixed and operate as competing entities struggling to exploit the underlying network infrastructure via frequency requests, while the management of the infrastructure itself remains the responsibility of a single (typically governmental) entity, the network operator. The line operators are typically unwilling to reveal their true incentives. Nevertheless, the network operator would like to ensure a fair (or, socially optimal) usage of the infrastructure, e.g., by maximizing the (unknown to him) aggregate incentives of the line operators. We show that this can be accomplished in certain situations via a (possibly anonymous) incentive-compatible pricing scheme for the usage of the shared resources, that is robust against the unknown incentives and the changes in the demands of the entities. This brings up a new notion of robustness, which we call incentive-compatible robustness, that considers as robustness of the system its tolerance to the entities' unknown incentives and elasticity of demands, aiming at an eventual stabilization to an equilibrium point that is as close as possible to the social optimum.

关键词： Elasticity

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