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International Conference on Advanced Learning Technologies (ICALT)

作者： I. Hatzilygeroudis C. Giannoulis C. Koutsojannis Dept of Computer Engineering & Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper, we present a Web-based intelligent education system to help students in the context of an AI course. We concentrate on the adaptivity and student evaluation aspects of the system. Adaptivity refers to the capability of the system to adapt teaching to student needs, specified by the student model characteristics. Student evaluation refers to the evaluation of the knowledge level of a student, which is one of the most important characteristics, with regards to taught concepts. Adaptive hypermedia techniques, like graphical link annotation, and an intelligent technique, i.e. a rule-based expert system, are used to achieve the above goals. An evaluation of the system showed encouraging results as far as its usability and learning are concerned.

关键词： Expert systems Adaptive systems Educational technology Artificial intelligence Intelligent systems Education Delta modulation World Wide Web Navigation Samarium

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Capturing application-domain specific patterns in a Web application: The e-learning paradigm

Capturing application-domain specific patterns in a Web appl...

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4th IASTED International Conference on Web-Based Education, WBE 2005

作者： Dimitrakopoulou, Dimitra Rigou, Maria Sirmakessis, Spiros Tsakalidis, Athanasios Tzimas, Giannis Research Academic Computer Technology Institute Internet and Multimedia Technologies Research Unit 61 Riga Feraiou str. GR-262 21 Patras Hellas Greece University of Patras Computer Engineering and Informatics Department GR-26504 Rio-Patras Hellas Greece Technological Educational Institution of Messolongi Nea Ktiria GR-30200 Messolongi Hellas Greece

ISBN: (纸本)0889864802

Designing and maintaining Web applications is one of the major challenges that software industry has to face. Several modeling techniques have been proposed to support this process. In this work we present a methodology for identifying design patterns within an application modelled using WebML, a modelling language for designing data-intensive Web applications. We extend the set of design patterns supported by WebML and exemplify the application of the methodology using an e-learning scenario.

关键词： E-learning

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MAX-MIN FAIR FLOW CONTROL SENSITIVE TO PRIORITIES

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Journal of Interconnection Networks 2005年第2期6卷 85-114页

作者： PANAGIOTA FATOUROU MARIOS MAVRONICOLAS PAUL SPIRAKIS Department of Computer Science University of Ioannina Ioannina GR-45110 Greece Department of Computer Science University of Cyprus Nicosia CY-1678 Cyprus Department of Computer Engineering and Informatics University of Patras Patras GR-26500 Greece Research and Academic Computer Technology Institute Patras GR-26110 Greece

Flow control is the dominant technique currently used in communication networks for preventing excess traffic from flooding the network, and for handling congestion. In rate-based flow control, transmission rates of sessions are adjusted in an end-to-end manner through a sequence of operations . In this work, we present a theory of max-min fair , rate-based flow control sensitive to priorities of different sessions, as a significant extension of the classical theory of max-min fair, rate-based flow control to networks supporting applications with diverse requirements on network resources. Each individual session bears a priority function , which maps the session's priority to a transmission rate; the priority is a working abstraction of the session's priority to bandwidth access. Priority functions enable the specification of requirements on bandwidth access by distributed applications, and the formal handling of such requirements. We present priority max-min fairness , as a novel and well motivated fairness condition which requires that assigned rates correspond, through the priority functions, to priorities comprising a max-min vector. We also introduce priority bottleneck algorithms gradually update a session's rate until when its priority is restricted on a priority bottleneck edge of the network. We establish a collection of interesting combinatorial properties of priority bottleneck algorithms. Most significantly, we show that they can only converge to priority max-min fairness. As an application of our general theory, we embed priority bottleneck algorithms in the more realistic optimistic framework for rate-based flow control. The optimistic framework allows for both decreases and increases of session rates. We exploit these additionally provided semantics to prove further combinatorial properties for the termination of priority bottleneck algorithms in the optimistic framework. We use these properties to conclude the first optimistic algorithms for efficien

关键词： Flow control Max-min fairness Priority max-min fairness Priority bottleneck algorithms Convergence complexity

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Performance enhancement of an AF service using TCP-aware marking and dynamic WRED

Performance enhancement of an AF service using TCP-aware mar...

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IEEE Symposium on computers and Communications (ISCC)

作者： C. Bouras A. Sevasti Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece Greek Research and Technology Network S. A. Athens Greece

The implementation of successful assured forwarding (AF) services according to the DiffServ framework remains a challenging problem today, despite the numerous proposals for AF PHB mechanisms and AF-based service implementations. In this work, we propose two modules, the TCP-window aware marker (TWAM) and the dynamic WRED (DWRED) mechanism for implementing the DiffServ AF PHB. We provide analytical models and an experimental evaluation in order to demonstrate how they succeed in enhancing the quality, increasing fairness, improving the performance and easing the deployment of a production- level AF-based service.

关键词： Traffic control Diffserv networks computer networks informatics Proposals Analytical models Spine Telecommunication traffic Bandwidth Statistics

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Neuro-Symbolic Approaches for Knowledge Representation in Expert Systems

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International Journal of Hybrid Intelligent Systems 2005年第3-4期1卷 111-126页

作者： Hatzilygeroudis, Ioannis Prentzas, Jim University of Patras School of Engineering Dept of Computer Engineering & Informatics 26500 Patras Hellas Greece. Research Academic Computer Technology Institute P.O. Box 1122 26110 Patras Hellas Greece.

In this paper, we first present and compare existing categorization schemes for neuro-symbolic approaches. We then stress the point that not all hybrid neuro-symbolic approaches can be accommodated by existing categories. Such a case is rule-based neuro-symbolic approaches that propose a unified knowledge representation scheme suitable for use in expert systems. That kind of integrated schemes have the two component approaches tightly and indistinguishably integrated, offer an interactive inference engine and can provide explanations. Therefore, we introduce a new category of neuro-symbolic integrations, namely ‘representational integrations’. Furthermore, two sub-categories of representational integrations are distinguished, based on which of the two component approaches of the integrations is given pre-eminence. Representative approaches as well as advantages and disadvantages of both sub-categories are discussed.

关键词： neuro-symbolic integrations rule-based expert systems connectionist expert systems

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Deployment of broadband infrastructure in the region of Western Greece

Deployment of broadband infrastructure in the region of West...

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International Conference on Broadband Networks (BroadNets)

作者： A. Alexiou C. Bouras V. Igglesis V. Kapoulas M. Paraskeuas I. Scopoulis J. Papagiannopoulos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece University of Ioannina (UoI) Greece University of Aegean Greece

This paper presents the work that is taking place in the Region of Western Greece in order to develop state-of-the-art broadband infrastructure. The current status of broadband infrastructure in the region is being analyzed and the main principles on which the deployment of the networks will be based on is being described, by presenting the metropolitan area networks and the wireless access networks that will be developed. Two case studies of such municipal networks are also presented in this paper

关键词： Metropolitan area networks High speed optical techniques Wireless networks Optical fibers Instruments Broadband communication Telecommunication services Communications technology Wavelength division multiplexing informatics

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A New Concept On A Quantum computer Based On Schockley‐Read‐Hall Recombination Statistics In Microelectronic Devices

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AIP Conference Proceedings 2005年第1期772卷 1463-1464页

作者： K. Theodoropoulos D. Ntalaperas I. Petras A. Tsakalidis N. Konofaos 1Computer Engineering and Informatics Dept. University of Patras Patras Greece 2Research Academic Computer Technology Institute Riga Feraiou 61 26110 Patras Greece

In this paper a quantum computer based on the recombination processes happening in semiconductor devices is presented. A “data element” and a “computational element” are derived based on Schokley‐Read‐Hall statistics and they can later be used in order to manifest a simple and known quantum algorithm. Such a paradigm is shown by the application of the proposed technology onto the Shor’s period‐finding algorithm.

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Workflow - coordinated integration of enterprise/ industrial systems based on a semantic service - oriented architecture

Workflow - coordinated integration of enterprise/ industrial...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： C. Alexakos A.P. Kalogeras S. Likothanassis J. Gialelis S. Koubias Pattern Recognition Laboratory Department of Computer Engineering and Informatics University of Patras Rio Greece Industrial Systems Institute Science Park Platani Greece Pattern Recognition Laboratory Department of Computer Engineering and Informatics Engineering and Informatics University of Patras Rio Greece Research Academic Computer Technology Institute Patras Greece Applied Electronics Laboratory Department of Electrical and Computer Engineering University of Patras Rio Greece

Enterprise integration is significant for the enforcement of novel business models in an enterprise/industry. The great heterogeneity of systems/applications in the enterprise environment requires the introduction of interoperability aspects in order to resolve integration problems in a flexible and dynamic way. Our approach introduces an advanced enterprise semantic model representing both enterprise structure and available services, through the use of ontologies. The model is associated by a specific architecture that uses the above model in combination with state-of-the-art technologies such as Web services and workflows

关键词： Application software Ontologies Web services Semantic Web computer architecture Service oriented architecture Logic Internet Electronics industry Industrial electronics

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Adaptive pricing functions for open outcry auctions

Adaptive pricing functions for open outcry auctions

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2005 IEEE/WIC/ACM International Conference on Intelligent Agent technology

作者： Kehagias, Dionisis Mitkas, Pericles A. Informatics and Telematics Institute Center for Research and Technology Hellas 1st km Thermi-Panorama road 57 001 Thermi Greece Department of Electrical and Computer Engineering Aristotle University of Thessaloniki 54 124 Thessaloniki Greece

ISBN: (纸本)0769524168

In agent-mediated marketplaces, autonomous agents deploy automated bidding mechanisms in order to increase revenue for humans. The ability of agents to estimate the next prices to be revealed in an auction, by applying forecasting, is a key element for efficient and successful bidding. In open outcry auctions, such as English and Dutch, information about bidders behavior is revealed at each round. This paper proposes a bid calculation function based on forecasting of the next price in English and Dutch auctions. The forecasting is based on two linear adaptive filters for stochastic estimation, whose parameters are calculated using a genetic algorithm. In order to test the efficiency of the two bidding methods and to benchmark the performance of the two filters, we conduct a set of experiments and present the results. © 2005 IEEE.

关键词： Adaptive systems

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Subchannels allocation on multiple pDSL lines

Subchannels allocation on multiple pDSL lines

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IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

作者： T. Antonakopoulos N. Papandreou Department Electrical Engineering & Computers Technology University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

The pDSL technology is used for providing multiple, high-speed broadband links over power lines in the indoor environment This work addresses the problem of bandwidth allocation between the various links of a pDSL network and proposes an algorithm for determining the allocation of the various subchannels during network activation and periodically during the normal network operation. The paper also demonstrates the performance of the proposed algorithm using an illustrative example.

关键词： Channel allocation Frequency Bandwidth Power engineering computing Telecommunication network reliability Performance evaluation Indoor environments Broadband communication Programmable control Power grids

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