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14th IEEE Workshop on Local and Metropolitan Area Networks, LANMAN 2005

作者： Varvitsiotis, Angelos P. Siris, Vasilios A. Primpas, Dimitris N. Fotiadis, Georgios I. Liakopoulos, Athanassios Ch. Bouras, Christos J. Greek Research and Technology Network Mesogeion 56 Athens GR 115 27 Dept. of Computer Science Institute of Computer Science University of Crete P.O. Box 1385 Heraklion Crete GR 711 10 Research Academic Computer Technology Institute Computer Engineering and Informatics Department University of Patras 61 Riga Feraiou Str. Patras GR 262 21

ISBN: (纸本)0780395654

DiffServ is the basis of contemporary QoS-enabled networks. Setting up DiffServ QoS requires extensive engineering effort in dimensioning and provisioning, especially for adjacent networks under different administrations linked in a "federated" hierarchy. In this paper we present a case study for QoS techniques employed in the GRNET MAN networks of Athens and Crete. After introducing the supported QoS mechanisms and service types, we discuss our dimensioning methodology and present two algorithms for worst-case dimensioning. We explain the provisioning mechanisms of GRNET and we present in brief our new automated provisioning ANS tool. Finally, we deal with the extension of our mechanisms and tools in hierarchically federated networks and give some future directions of our work.

关键词： Mobile telecommunication systems

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Using expert systems technology for student evaluation in a web based educational system

Using expert systems technology for student evaluation in a ...

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

作者： Hatzilygeroudis, Ioannis Chountis, Panagiotis Giannoulis, Christos Koutsojannis, Constantinos University of Patras Dept of Computer Engin. and Informatics 26500 Patras Hellas Greece Research Academic Computer Technology Institute P.O. Box 1122 Patras Hellas Greece

ISBN: (纸本)0889864802

In this paper, we present a web-based intelligent education system to help students and tutors in the context of an AI course. We concentrate on the knowledge management and student evaluation aspects of the system. Knowledge management mainly refers to test questions construction and management. Student evaluation refers to the evaluation of the knowledge level of a student with regards to taught concepts. A rule-based expert system helps in student evaluation. A number of statistics provided by the system give valuable information to the tutor.

关键词： Knowledge management

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Gesture-based video summarization

Gesture-based video summarization

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IEEE International Conference on Image Processing 2005, ICIP 2005

作者： Kosmopoulos, D.I. Doulamis, A. Doulamis, N. National Centre for Scientific Research Demokritos Institute of Informatics and Telecommunications National Technical University of Athens Dept. of Electrical and Computer Engineering

ISBN: (纸本)0780391349

A novel method for summarizing videos of gestures is presented. The gestures performed by the hands and the head are extracted through skin color segmentation and represented through Zernike moments. The gesture energy is calculated using the norms of the Zernike moments and monitored through time for local minima and maxima that indicate distinctive visual events and thus key-frames. The proposed scheme is not threshold-dependent and therefore the number of extracted key-frames varies according to the complexity of gesture energy variation. The applicability of the method is verified experimentally in sign language videos. © 2005 IEEE.

关键词： Gesture recognition

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Providing service standardisation for virtual enterprises

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1545-1552页

作者： Vassiliadis, B. Tsaknakis, J. Drossos, L. Sirmakessis, S. Ioannou, K. Internet and Multimedia Technologies Academic Research Computer Technology Institute Patras Greece Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

Virtual Enterprises are a, relatively, new business model that is greatly depended on network technology. Providing services in such an environment is a challenge in itself;architectural, technological and organisational difficulties have not permitted yet the development of a framework for Virtual Enterprise enaction. In this paper we describe a Virtual Private Network architecture that uses special monitor and coordination processes in order to achieve efficient delivery of services and activities in Virtual Enterprise environments. We discuss the general architecture of the system, emphasising on the solutions used to monitor and co-ordinate various activities.

关键词： Virtual reality

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Using Semantic Web Mining technologies for personalized e-Learning experiences

Using Semantic Web Mining technologies for personalized e-Le...

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

作者： Markellou, Penelope Mousourouli, Ioanna Spiros, Sirmakessis Tsakalidis, Athanasios Research Academic Computer Technology Institute 61 Riga Feraiou str. 26221 Patras Greece University of Patras Computer Engineering and Informatics Department 26504 Patras Greece Technological Education Institute of Messolongi Department of Applied Informatics in Administration and Economics 30200 Messolongi Greece

ISBN: (纸本)0889864802

The challenge of the Semantic Web Mining technologies in the e-Learning domain can relate to the provision of personalized experiences for the users. Particularly, these applications can take into consideration the individual needs and requirements of learners. In this paper, we propose a framework for personalised e-Learning based on aggregate usage profiles and a domain ontology. We have distinguished two stages in the whole process, one of offline tasks that includes data preparation, ontology creation and usage mining and one of online tasks that concerns the production of recommendations.

关键词： Ontology

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A cost mechanism for fair pricing of resource usage

A cost mechanism for fair pricing of resource usage

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1st International Workshop on Internet and Network Economics, WINE 2005

作者： Mavronicolas, Marios Panagopoulou, Panagiota N. Spirakis, Paul G. Department of Computer Science University of Cyprus Nicosia CY-1678 Cyprus Department of Computer Engineering and Informatics Patras University Greece Research Academic Computer Technology Institute Patras University N. Kazantzaki Str. Rion Patras GR 26500 Greece

ISBN: (纸本)3540309004

We propose a simple and intuitive cost mechanism which assigns costs for the competitive usage of m resources by n selfish agents. Each agent has an individual demand;demands are drawn according to some probability distribution. The cost paid by an agent for a resource she chooses is the total demand put on the resource divided by the number of agents who chose that same resource. So, resources charge costs in an equitable, fair way, while each resource makes no profit out of the agents. We call our model the Fair Pricing model. Its fair cost mechanism induces a non-cooperative game among the agents. To evaluate the Nash equilibria of this game, we introduce the Diffuse Price of Anarchy, as an extension of the Price of Anarchy that takes into account the probability distribution on the demands. We prove: Pure Nash equilibria may not exist, unless all chosen demands are identical;in contrast, a fully mixed Nash equilibrium exists for all possible choices of the demands. Further on, the fully mixed Nash equilibrium is the unique Nash equilibrium in case there are only two agents. In the worst-case choice of demands, the Price of Anarchy is (n);for the special case of two agents, the Price of Anarchy is less than 2 - 1/m. Assume now that demands are drawn from a bounded, independent probability distribution, where all demands are identically distributed and each is at most a (universal for the class) constant times its expectation. Then, the Diffuse Price of Anarchy is at most that same constant, which is just 2 when each demand is distributed symmetrically around its expectation. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Resource allocation

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A tight bound for online coloring of disk graphs

A tight bound for online coloring of disk graphs

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12 International Colloquium on Structural Information and Communication Complexity, SIROCCO 2005

作者： Caragiannis, Ioannis Fishkin, Aleksei V. Kaklamanis, Christos Papaioannou, Evi Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras 26500 Rio Greece Max Planck Institut für Informatik Stuhlsatzenhausweg 85 Geb. 46.1 66123 Saarbrücken Germany

We present an improved upper bound on the competitiveness of the online coloring algorithm First-Fit in disk graphs which are graphs representing overlaps of disks on the plane. We also show that this bound is best possible for deterministic online coloring algorithms that do not use the disk representation of the input graph. We also present a related new lower bound for unit disk graphs. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Graph theory

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Multimedia analysis and annotation requirements for the semantic web

Multimedia analysis and annotation requirements for the sema...

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2nd European Workshop on the Integration of Knowledge, Semantics and Digital Media technology, EWIMT 2005

作者： Tzouvaras, Vassilis Dasiopoulou, Stamatia Martin-Recuerda, Francisco Stoilos, Giorgos Kompatsiaris, Yannis Stamou, Giorgos National Technical University of Athens Dept. Electrical and Computer Engineering Athens Greece Informatics and Telematics Institute GR-57001 Thermi-Thessaloniki Greece Digital Enterprise Research Institute Institute of Computer Science University of Innsbruck Austria

ISBN: (纸本)0863415954

The Semantic Web is about adding formal structure and explicit semantics to web content for the purpose of more efficient information management and access by both humans and computers. Through the use of machine understandable semantics, web resources become much easier and more readily accessible. Populating the Semantic Web with multimedia metadata requires for appropriate technologies to support both the analysis (metadata extraction) and the annotation (metadata creation) processes. The media- and content-specific semantics of multimedia resources pose great challenges in terms of capturing and manipulating the two layer semantics given the available knowledge representation formalisms. The Knowledge Web project, advancing ontology technology research efforts and ensuring transferring the semantic web from academia to industry, has provided solutions to some of the most challenging multimedia related problems.

关键词： Semantic Web

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Designing virtual spaces to support learning communities and e-collaboration

Designing virtual spaces to support learning communities and...

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International Conference on Advanced Learning Technologies (ICALT)

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

In this paper, we present the design principles for virtual spaces and two different tools as solutions for supporting e-collaboration and multi-user communication in Web-based learning communities. The first solution, called Virtual Conference, is designed and implemented in the framework of the VirRAD European project. It is a two-dimensional space where participants represented by their photos can use various e-collaboration tools. The second solution, called EVE Training Area, is a three-dimensional space where participants, represented by 3D humanoid avatars, can use a variety of e-collaboration tools. This paper describes the functionality provided by both tools, compares them, and proposes cases for exploiting each solution.

关键词： Space technology Management training Avatars Videoconference Design engineering informatics Navigation Electronic learning User interfaces Virtual reality

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Rate and loss control for video transmission over UMTS using real-time protocols

Rate and loss control for video transmission over UMTS using...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication Systems (MASCOTS)

作者： A.G. Alexiou C.J. Bouras Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

UMTS is evolving toward a future wireless all-IP network. In this paper we present how it supports realtime IP multimedia services, as these services are expected to drive the adoption of wireless all-IP networks. The scheme of real time streaming video is one of the newcomers in wireless data communication and in particular in UMTS, raising a number of novel requirements in both telecommunication and data communication systems. This scheme applies when the mobile user is experiencing real time video content. In this work we focus on the design and implementation of a rate and loss control mechanism for monitoring the UMTS network state and estimating the appropriate rate of the streaming video data.

关键词： Propagation losses 3G mobile communication Protocols Streaming media Data communication Real time systems Wireless communication Communication system control Telecommunication control Monitoring

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