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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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Dynamic bit-loading in pDSL communications systems

Dynamic bit-loading in pDSL communications systems

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

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

This paper presents a dynamic discrete bit-loading algorithm for multicarrier pDSL communication links that utilize the indoor power line network. In order to confront the time varying behavior of power line transmission media, the proposed algorithm provides fast adaptive bit and power loading with reduced complexity using channel state information and a subchannel link-allocation profile. Numerical results based on simulated network loading scenarios demonstrate the performance and the complexity of the proposed method.

关键词： Heuristic algorithms DSL Time varying systems Power engineering computing Channel state information Power grids Programmable control Frequency division multiplexing computer networks Electronic mail

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WiFiAdmin: an intelligent Web-based management environment for wireless networks

WiFiAdmin: an intelligent Web-based management environment f...

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International Conference on Information technology and Applications, ICITA

作者： E. Dimopoulos A. Panousis E. Sakkopoulos A. Tsakalidis Internet and Multimedia Technologies Research Unit RA Computer Technology Institute Greece Computer Engineering & Informatics Department University of Patras Patras Greece

Wireless network communities face a number of difficulties due to lack of integration between network and community resources management. In this work, we present a novel solution and we outline the architecture, design and implementation of an intelligent Web based management system for metropolitan area wireless network communities. The system supports multi-user and personalization features combined with wireless node configuration and monitoring, in a portal-like environment. Additionally to the software discussed, a test-bed implementation is presented to confirm platform and software robustness and cost-effectiveness of the proposed solutions. The overall environment is already operational for two years, while user and administrators' feedback has been incorporated into the system in a regular manner. Evaluation of the work has been performed in the online wireless network environment by computer and communication engineers and it strongly indicates that the proposed mechanism is both effective and efficient. Finally, future steps and enhancements are discussed.

关键词： Intelligent networks Environmental management Wireless networks Resource management computer architecture Service oriented architecture Urban areas Monitoring Software testing Robustness

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Providing support for integrated scientific computing: metacomputing meets the grid and the semantic Web 05

Providing support for integrated scientific computing: metac...

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IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGRID)

作者： S. Lalis C. Houstis M. Pitikakis G. Vasilakis M. Vavalis Department of Computer and Communications Engineering University of Thessally Greece Informatics and Telematics Institute Center for Research and Technology Greece

ISBN: (纸本)9780780390744

In this paper, we present an integrated system architecture for metacomputing on top of distributed scientific resources via semantic-driven information management. Our approach is to consider both data and programs as objects of an application-specific ontology, describing them via corresponding metadata schemata that can be exploited to search for and to generate information in an efficient and automated way. Metacomputations are expressed in the form of workflows thereby enabling a flexible combination of data and program objects that can reside on different servers or grid resources. Workflow descriptions are associated with ontology concepts and can be activated as a side-effect of searching for information to produce new data on demand. We also report on the current status of an implementation that provides support for several aspects of this architecture.

关键词： Scientific computing Metacomputing Semantic Web computer architecture Grid computing Resource management Distributed computing Service oriented architecture Information management Ontologies

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