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IEEE computer Society Annual Symposium on VLSI

作者： X. Kavousianos D. Bakalis M. Bellos D. Nikolos Computer Science Department University of Ioannina (UoI) Ioannina Greece Computer Engineering & Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

This paper presents a novel test vector ordering method for average power consumption minimization. The proposed method orders the test vectors taking into account the expected switching activity at the primary inputs and at a very small set of internal lines of the circuit under test. The computational time required by the proposed method is very small while the power reduction achieved is very close to the best, with respect to power reduction, most time-consuming method. Experimental results show that apart from average power reduction, the proposed method achieves significant peak power reduction too.

关键词： System testing Very large scale integration computer Society

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A new pricing mechanism for a high-priority diffserv-based service

A new pricing mechanism for a high-priority diffserv-based s...

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International Conference on Advanced Communication technology (ICACT)

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

QoS provisioning according to the DifTServ framework has raised the requirements for pricing mechanisms that preserve the potential and flexibility of DiffServ. At the same time, such mechanisms should reflect resource usage, allocate resources efficiently, reimburse costs or maximize service provision profits and lead customers to requesting services that will maximize their revenue. This work proposes a policy for pricing based on resource allocation by a particular category of DiffServ-based services for aggregated traffic in the case of transport networks. Our research takes into account the particularities that apply to the case of DiffServ services' provision over transport networks while imposing minimal overload and a-priori estimation of costs. The detailed pricing methodology is presented and experimentally evaluated.

关键词： Pricing Costs Diffserv networks Quality of service Resource management Telecommunication traffic Contracts computer networks Web and internet services Quality management

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The Healthgrid White Paper 3

The Healthgrid White Paper

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3rd Annual Conference of the Healthgrid Association, Healthgrid 2005

作者： Breton, Vincent Dean, Kevin Solomonides, Tony Aloisio, Giovanni Benkner, Siegfried Bilofsky, Howard Blanquer, Ignacio Brady, Michael Cannataro, Mario Chouvarda, Ioanna Claerhout, Brecht De Moor, Georges De Neve, Wilfried De Wagter, Carlos Fiore, Sandro Hassan, Kinda Heeren, Germaine Hernández, Vicente Herveg, Jean A.M. Hofmann, Martin Jones, Chris Koutkias, Vassilios Lloyd, Sharon Lonsdale, Guy Alonso, Victoria L. Maglaveras, Nicos Maigne, Lydia Malousi, Andigoni Martín-Sánchez, Fernando McClatchey, Richard Medico, Enzo Miguet, Serge Mirto, Maria Montagnat, Johan Nørager1, Sofie Nozaki, Kazunori Oliveira, Ilídio Castro Pennec, Xavier Poullet, Yves Merino, Juan Pedro Sánchez Strizh, Irina G. Taillet, Michel Tristram, Clive Tverdokhlebov, Nikolay Veltri, Pierangelo Ziegler, René CNRS-IN2P3 LPC Campus des Cézeaux AubiereCedex63177 France Internet Business Solutions Group Cisco Systems 9 New Square Bedfont Lakes Middlesex FelthamTW14 8HA United Kingdom University of the West of England Bristol CEMS Coldharbour Lane BristolBS6 6TH United Kingdom Center for Advanced Computational Technologies ISUFI Dept. of Innovation Engineering University of Lecce Via per Monteroni Lecce73100 Italy Institute of Scientific Computing University of Vienna Nordbergstrasse 15 ViennaA-1090 Austria University of Pennsylvania School of Engineering and Applied Science Computer and Information Science Center for Bioinformatics 1416 Blockley Hall 423 Guardian Drive PhiladelphiaPA19104-6021 United States Universidad Politecnica de Valencia Camino de Vera/n Valencia46022 Spain FRS FREng Dept. of Engineering Science Oxford University Parks Road OxfordOX1 3PJ United Kingdom Magna Graecia University of Catanzaro School of Bioinformatics and Biomedical Engineering Campus di Germaneto Viale Europa Germaneto Catanzaro88100 Italy Aristotle University The Medical School Lab of Medical Informatics Box 323 Thessaloniki54124 Greece Custodix NV Verlorenbroodstraat 120 Bus 14 MerelbekeB-9820 Belgium Research in Advanced Medical Informatics and Telematics UZ Gent 5K3 De Pintelaan 185 GentB9000 Belgium Department of Radiotherapy Ghent University Hospital Building P7 De Pintelaan 185 GentB-9000 Belgium Laboratoire LIRIS Université Lumière Lyon 2 Campus Porte des Alpes 5 avenue Pierre Mendès France Bron69676 France av. E.Mounierlaan 83 Brussels1200 Belgium Faculté de Droit de Namur - FUNDP Centre de Recherches Informatiques & Droit 5 rempart de la Vierge Namur5000 Belgium Schloss Birlinghoven Sankt Augustin53754 Germany CERN Geneva 231211 Switzerland Oxford University Computing Laboratory Wolfson Building OxfordOX1 3QD United Kingdom C&C Research Laboratories NEC Europe Ltd. Rathausallee 10 Sankt AugustinD-53757 Germany Medic

ISBN: (纸本)158603510X

Over the last four years, a community of researchers working on Grid and High Performance Computing technologies started discussing the barriers and opportunities that grid technologies must face and exploit for the development of health-related applications. This interest lead to the first Healthgrid conference, held in Lyon, France, on January 16th–17th, 2003, with the focus of creating increased awareness about the possibilities and advantages linked to the deployment of grid technologies in health, ultimately targeting the creation of a European/international grid infrastructure for health. The topics of this conference converged with the position of the eHealth division of the European Commission, whose mandate from the Lisbon Meeting was "To develop an intelligent environment that enables ubiquitous management of citizens’ health status, and to assist health professionals in coping with some major challenges, risk management and the integration into clinical practice of advances in health knowledge." In this context "Health" involves not only clinical procedures but covers the whole range of information from molecular level (genetic and proteomic information) over cells and tissues, to the individual and finally the population level (social healthcare). Grid technology offers the opportunity to create a common working backbone for all different members of this large "health family" and will hopefully lead to an increased awareness and interoperability among disciplines. The first HealthGrid conference led to the creation of the Healthgrid association, a non-profit research association legally incorporated in France but formed from the broad community of European researchers and institutions sharing expertise in health grids. After the second Healthgrid conference, held in Clermont-Ferrand on January 29th–30th, 2004, the need for a "white paper" on the current status and prospective of health grids was raised. Over fifty experts from different areas of grid tec

关键词： Health risks

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Electronic national lotteries

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8th International Conference on Financial Cryptography, FC 2004

作者： Konstantinou, Elisavet Liagkou, Vasiliki Spirakis, Paul Stamatiou, Yannis C. Yung, Moti Research and Academic Computer Technology Institute P.O. Box 1122 Patras26110 Greece Department of Computer Engineering and Informatics University of Patras Patras26500 Greece Department of Mathematics University of the Aegean Karlovassi Samos83200 Greece on Communications and Information Systems Security University of the Aegean and Athens University of Economics and Business Greece Computer Science Columbia University New YorkNY United States

ISBN: (纸本)3540224203

We describe the design and implementation of secure and robust protocol and system for a national electronic lottery. Electronic lotteries at a national level are a viable cost effective alternative to mechanical ones when there is a business need to support many types of "games of chance" and to allow increased drawing frequency. Electronic lotteries are, in fact, extremely high risk financial application: If one discovers a way to predict or otherwise claim the winning numbers (even once) the result is huge financial damages. Moreover, the e-lottery process is complex, which increases the possibility of fraud or costly accidental failures. In addition, a national lottery must adhere to auditability and (regulatory) fairness requirements regarding its drawings. Our mechanism, which we believe is the first one of its kind to be described in the literature, builds upon a number of cryptographic primitives that ensure the unpredictability of the winning numbers, the prevention of their premature leakages and prevention of fraud. We also provide measures for auditability, fairness, and trustworthiness of the process. Besides cryptography, we incorporate security mechanisms that eliminate various risks along the entire process. Our system which was commissioned by a national organization, was implemented in the field and has been operational and active for a while, now. © IFCA/Springer-Verlag Berlin Heidelberg 2004.

关键词： Cryptography

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On threshold properties

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Journal of Discrete Mathematical Sciences and Cryptography 2004年第2期7卷 249-254页

作者： Antonopoulou, Hera Department of Computer Engineering and Informatics Patras University Rio Patras 265 00 Greece Research and Academic Computer Technology Institute Patras 26110 P.O. Box 1122 Greece

In this paper we consider two random graph models and their relationship. More specifically, we consider the random graph model Gn,m, where a random graph is constructed by drawing uniformly and independently m edges ...

In this paper we consider two random graph models and their relationship. More specifically, we consider the random graph model G_n,m, where a random graph is constructed by drawing uniformly and independently m edges out of the (Formula presented.) possible edges without repetition, and the random graph model G_n,mm where a random graph is constructed by the same process, but the an edge is allowed to be selected more than once. We prove that the property of a random graph G of the latter model having multiple edges is a threshold property, with threshold function t(n) = n. Moreover, if m = cn for some positive real number c, then the probability that a random graph G has multiple edges approaches exp(–c ²). © 2004 Taylor & Francis Group, LLC.

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A GA-based multi-purpose optimization algorithm for QoS routing

A GA-based multi-purpose optimization algorithm for QoS rout...

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Proceedings - 18th International Conference on Advanced Information Networking and Applications, AINA 2004

作者： Koyama, Akio Barolli, Leonard Matsumoto, Kazunori Apduhan, Bernady O. Department of Informatics Yamagata University 4-3-16 Jonan Yonezawa Yamagata 992-8510 Japan Dept. of Information Engineering Fukuoka Institute of Technology 3-30-1 Wajiro-Higashi Higashi-ku Fukuoka 811-0295 Japan Department of Computer Software University of Aizu Tsuruga Ikki-machi Aizu-Wakamatsu 965-8580 Fukushima Japan Dept. of Intelligent Informatics Kyushu Sangyo University 2-3-1 Matsukadai Higashi-ku Fukuoka 813-8503 Japan

ISBN: (纸本)0769520510

The routing algorithms for multimedia communication should use for routing more than one QoS parameter. This is because new services such as video on demand and remote meeting systems require better QoS. However, the problem of QoS routing is difficult and to find a feasible route with two independent path constraints is NP-complete. Also, QoS routing algorithms for broadband networks must be adaptive, flexible, and intelligent for efficient network management. In this paper, we propose a multipurpose optimization method for QoS routing based on Genetic Algorithm (GA). The simulation results show that proposed method has a good performance and is a promising method for QoS routing.

关键词： Routers

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Issues for the performance monitoring on networked virtual environments: The case of EVE 7

Issues for the performance monitoring on networked virtual e...

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7th International Conference on Telecommunications, ConTEL 2003

作者： Bouras, C. Giannaka, E. Tsiatsos, Th. Research Academic Computer Technology Institute Computer Engineering and Informatics Dept. Univ. of Patras Patra Greece

ISBN: (纸本)9531840520

The wide expansion and increasing demand for Networked Virtual Environments resulted in efforts for the optimization of these environments with the enhancement of advanced features, which offered extended functionality and created an improved sense of realism. However, the added functionality often creates resource overhead both in the system as well as in the network host, which results in performance reduction. This paper presents such a networked virtual environment and based on the system's architecture tries to trace down with the time and recourse consuming parameters and proposes models on which a networked virtual environment, like the one presented, could achieve optimization of its performance. © 2003, institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Virtual reality

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Offering open hypermedia services to the WWW: A step-by-step approach for developers 03

Offering open hypermedia services to the WWW: A step-by-step...

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12th International Conference on World Wide Web, WWW 2003

作者： Karousos, Nikos Pandis, Ippokratis Reich, Siegfried Tzagarakis, Manolis Research Academic Computer Technology Institute 26500 Rion Greece Dept. of Computer Engineering and Informatics University of Patras 26500 Rion Greece Salzburg Research Austria

ISBN: (纸本)1581136803

Hypermedia systems and more specifically open hypermedia systems (OHS) provide a rich set of implementations of different hypertext flavors such as navigational hypertext, spatial hypertext or taxonomic hypertext. Additionally, these systems offer component-based modular architectures and address interoperability between hypertext domains. Despite multiple efforts of integrating Web clients, a widespread adoption of OHS technology by Web developers has not taken place. In this paper it is argued that Web Services - which offer a component model for Web applications - can be integrated in OHSs. An architectural integration is proposed, a step-by-step process is outlined and an example of integration is provided. This very approach is aimed to benefit both worlds: the Web community with new rich hypermedia functionality that extends the current navigational hypermedia, and the OHS community by opening its tools and platforms to the many developer groups of the Web community.

关键词： Hypermedia systems

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Multi-user layer in the EVE distributed virtual reality platform

Multi-user layer in the EVE distributed virtual reality plat...

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International Conference on Distributed Computing Systems Workshop

作者： C. Bouras D. Psaltoulis C. Psaroudis T. Tsiatsos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

In this paper, we present the design and implementation of a VRML97 multi-user layer, which is introduced in the EVE distributed virtual reality platform. Main consideration of our multi-user extension is the ease of transforming single-user virtual worlds to multi-user virtual worlds, as well as the conformity with any standard VRML97 browser. Furthermore, we present the EVE's communication platform, which can be used in order to support Collaborative Virtual Environments (CVEs). Main issues regarding the effective network communication as well as the initialization of the 3D scene are discussed in this paper.

关键词： Virtual reality Distributed computing informatics Virtual environment Design engineering Layout Space technology Collaboration User interfaces Web sites

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Issues for the performance monitoring on networked virtual environments: the case of EVE

Issues for the performance monitoring on networked virtual e...

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International Conference on Telecommunications (ConTEL)

作者： C. Bouras E. Giannaka Th. Tsiatsos Research Academic Computer Technology Institute Computer Engineering and Informatics Department University of Patras Patras Greece

The wide expansion and increasing demand for networked virtual environments resulted in efforts for the optimization of these environments with the enhancement of advanced features, which offered extended functionality and created an improved sense of realism. However, the added functionality often creates resource overhead both in the system as well as in the network host, which results in performance reduction. This paper presents such a networked virtual environment and based on the system's architecture tries to trace down with the time and recourse consuming parameters and proposes models on which a networked virtual environment, like the one presented, could achieve optimization of its performance.

关键词： computer aided software engineering Virtual environment computer networks Condition monitoring Virtual reality computerized monitoring informatics Computational modeling computer simulation System performance

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