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2009 IEEE Wireless Communications and Networking Conference, WCNC 2009

作者： Alexiou, Antonios Bouras, Christos Kokkinos, Vasileios Research Academic Computer Technology Institute Patras Greece and Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)9781424429486

This paper proposes a power control mechanism for the efficient radio bearer selection in the Multimedia Broadcast/Multicast Service (MBMS) framework of Universal Mobile Telecommunications System (UMTS). The selection of the most efficient transport channel in terms of power consumption is a key point for MBMS enabled UMTS networks, since a wrong transport channel selection for the transmission of the MBMS data could result to a significant decrease in the total capacity of the network. Different UMTS transport channels and power saving techniques are examined and an algorithm that selects the most efficient combination of the above parameters is proposed. The proposed MBMS power control mechanism selects the transport channel that minimizes the base station's transmission power in every cell of the network that serves multicast users. © 2009.

关键词： Power control

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Multiplayer pervasive games and networked interactive installations using ad hoc mobile sensor networks

Multiplayer pervasive games and networked interactive instal...

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International Conference on Advances in computer Entertainment technology, ACE 2009

作者： Akribopoulos, Orestis Logaras, Marios Vasilakis, Nikos Kokkinos, Panagiotis Mylonas, Georgios Chatzigiannakis, Ioannis Spirakis, Paul Research Academic Computer Technology Institute Dpt. of Computer Engineering and Informatics Patras Greece

ISBN: (纸本)9781605588643

In this work, we showcase a set of implemented multiplayer games and interactive installations based on Fun in Numbers (FinN). FinN allows the quick prototyping of applications that utilize input from multiple physical sources (sensors and other means of interfacing), by offering a set of programming templates and services, such as proximity, localization and synchronization, that hide the underlying complexity.

关键词： Sensor networks

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A combined TCP aware scheduling and assembly scheme for OBS networks

A combined TCP aware scheduling and assembly scheme for OBS ...

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2009 6th International Conference on Broadband Communications, Networks and Systems, BROADNETS 2009

作者： Ramantas, Kostas Vlachos, Kyriakos Computer Engineering and Informatics Department Research Academic Computer Technology Institute University of Patras Rio Greece

ISBN: (纸本)9789639799493

The efficient transmission of TCP traffic over OBS networks is a challenging problem, due to the high sensitivity of TCP congestion control mechanism to losses. In this work, we propose solutions to this problem, through the burst assembly and scheduling mechanism of OBS. We investigate and propose algorithms to achieve performance enhancements for TCP traffic by taking into account TCP state information. We prove our claims with references to well-established TCP models, and validate the proposed algorithms through simulations.

关键词： Optical burst switching

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A framework model for DVEs using SIMUL8 2

A framework model for DVEs using SIMUL8

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2nd International ICST Conference on Simulation Tools and Techniques, SIMUTools 2009

作者： Bouras, Christos Giannaka, Eri Tsiatsos, Thrasyvoulos Research Academic Computer Technology Institute and Computer Engineering and Informatics Department N. Kazatzaki Str. GR-26500 Greece Research Academic Computer Technology Institute and Informatics Dept. Aristotle University of Thessaloniki N. Kazatzaki Str. GR-26500 Greece

ISBN: (纸本)9789639799455

Distributed Virtual Environment systems simulate the behaviour and activities of a great number of users interacting in a virtual world over a wide area network. The sizes of the virtual worlds and the tremendous number of users that DVEs are called to support require additional bandwidth and computational resources. For handling these growing requirements a lot of work has been done both to the direction of alternative architectural solutions as well as to techniques and algorithms for handling the limitations of these environments. For supporting large-scale DVEs, extended infrastructure is needed in terms of both hardware and software. However, both researchers and application designers do not always have access to such extended infrastructure and the assessment and evaluation of developed techniques becomes extremely difficult. To this direction, this paper presents a simulation modelling tool for networked servers DVEs that could be used by designers for simulating the performance of their approaches under different scenarios.

关键词： Wide area networks

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ICT BONE views on the Network of the Future: The role of Optical Networking

ICT BONE views on the Network of the Future: The role of Opt...

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International Conference on Transparent Optical Networks

作者： Christina Politi Anna Tzanakaki Michael O'Mahony Kostas Katrinis Peter Van Daele Mario Pickavet Dimitra Simeonidou Alexandros Stavdas Gerald Franzl John Mitchell Piero Castoldi Salvatore Spadaro Franco Callegatti Periklis Petropoulos Kyriakos Vlachos Achille Pattavina Department of Telecommunications Science and Technology University of Peloponnese Tripoli Greece Athens Information Technology Center Athens Greece University of Essex UK IBBT Ghent University Belgium University of Technology Vienna Vienna Austria Department of Electronic and Electrical Engineering University College London London UK Scuola Superiore Sant'' Anna Pisa Italy Universitat Poliltècnica de Catalunya Barcelona Spain DEIS University of Bologna Cesena Italy Optoelectronics Research Centre University of Southampton Southampton UK Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece Department of Electronics and Information Politecnico di Milano Italy

Part of the activities of the ICT EU Network of Excellence "Building the future Optical Network in Europe" (BONE) project is the development of the European Roadmap on Optical Networking in the context of the "Network of the Future". This paper presents a summary of the views of the BONE consortium as they were developed in the framework of the Roadmap activity. The methodology followed in the development of the BONE Roadmap was firstly to identify and analyse the status of broadband access penetration as well as the availability of specific network and IT technologies in various European countries. The data collected were then processed and translated into the traffic volume (distributed across different European countries) that a Pan-European network would need to support. This information is then used as the basis of a WDM optical network dimensioning exercise performed with the aim of identifying the scale of the required optical network. In addition, based on estimations regarding the evolution of broadband access technologies and the degree of broadband penetration and network services and applications, extrapolations regarding the growth of traffic to be supported by the European Network of the Future were made in a systematic manner. These were also used to dimension and understand the requirements of the European Network of the Future. This paper presents the relevant results and also provides a discussion on the BONE consortium views on the Network of the Future from an architectural and technology perspective and an outlook of the relevant key research challenges and possible solutions.

关键词： Bones Optical fiber networks Europe Availability computer networks Optical computing Telecommunication traffic Electronic mail Information technology informatics

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Performance evaluation of a dynamic approach for networked servers distributed virtual environments

Performance evaluation of a dynamic approach for networked s...

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2009 Spring Simulation Multiconference, SpringSim 2009

作者： Bouras, Christos Giannaka, Eri Tsiatsos, Thrasyvoulos Research Academic Computer Technology Institute Greece Computer Engineering and Informatics Department University of Patras Greece Department of Informatics Aristotle University of Thessaloniki Greece

Distributed Virtual Environment systems simulate the behaviour and activities of a great number of concurrent users interacting in a virtual world over a wide area network. The advances both in computer technology and networking infrastructures in combination to the advanced applications and services developed, expanded the popularity of DVEs and promoted their use in a wide range of areas, such as learning and training, collaborative work, military applications and multiplayer online games. The sizes of the virtual worlds simulated and the tremendous number of users that DVEs are called to support require additional bandwidth and computational resources. For handling these growing requirements a lot of work has been done both to the direction of alternative architectural solutions as well as to techniques and algorithms for handling and overcoming the limitations of these environments. However, recent research has shown that one of the major limitations of networked servers DVE systems is scalability. To this direction this paper presents on the one hand a dynamic approach for DVEs, which exploits the nature of these systems for the optimal resource management and extended scalability support and on the other hand, evaluates its performance through a series of experiments and under various settings of the virtual world, using Simul8 simulation tool.

关键词： Resource allocation

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An open and integrated management platform for wireless sensor networks

An open and integrated management platform for wireless sens...

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2009 International Symposium on Autonomous Decentralized Systems, ISADS 2009

作者： Kalochristianakis, M. Gkamas, V. Mylonas, G. Nikoletseas, S. Varvarigos, E. Rolim, J. Research Academic Computer Technology Institute Department of Computer Engineering Informatics University of Pairas Rio Greece Department of Computer Science University of Geneva Switzerland

ISBN: (纸本)9781424443277

We present the conceptual basis and the initial planning for an open source management architecture for wireless sensor networks (WSN). Although there is an abundance of open source tools serving the administrative needs of WSN deployments, there is a lack of tools or platforms for high level integrated WSN management. This is because of a variety of factors, including the lack of open source management tools, the immaturity of tools that offer manageability for WSNs, the limited high level management capabilities of sensor devices and architectures, and the lack of standardization. The current work is, to our knowledge, the first effort to conceptualize, formalize and design a remote, integrated management platform for the support of WSN research laboratories. The platform is based on the integration and extension of two innovative platforms: jWebDust, a WSN operation and management platform, and OpenRSM, an open source integrated remote systems and network management platform. The proposed system architecture can support several levels of integration (infrastructure management, functionality integration, firmware management), corresponding to different use-cases and application settings.

关键词： Wireless sensor networks

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Date-based dynamic caching mechanism

Date-based dynamic caching mechanism

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IADIS European Conference on Data Mining 2009, ECDM'09. Part of the IADIS Multi Conference on computer Science and Information Systems, MCCSIS 2009

作者： Bouras, Christos Poulopoulos, Vassilis Silintziris, Panagiotis Research Academic Computer Technology Institute N. Kazantzaki Panepistimioupoli and Computer Engineering and Informatics Department University of Patras 26504 Rion Patras Greece Computer Engineering and Informatics Department University of Patras 26504 Rion Patras Greece

ISBN: (纸本)9789728924881

News portals based on the RSS protocol are becoming nowadays one of the dominant ways that Internet users follow in order to locate the information they are looking for. Search engines, which operate at the back-end of a big portion of these web sites, receive millions of queries per day on any and every walk of web life. While these queries are submitted by thousands of unrelated users, studies have shown that small sets of popular queries account for a significant fraction of the query stream. A second truth has to do with the high frequency that a particular user tends to submit the same or highly relative search requests to the engine. By combining these facts, in this paper, we design and analyze the caching algorithm deployed in our personalized RSS portal, a web-based mechanism for the retrieval, processing and presentation in a personalized view of articles and RSS feeds collected from major Internet news portals. By using moderate amounts of memory and little computational overhead, we achieve to cache query results in the server, both for personalized and non-personalized user searches. Our caching algorithm operates not in a stand-alone manner but it co-operates and binds with the rest of the modules of our Portal in order to accomplish maximum integration with the system. © 2009 IADIS.

关键词： Search engines

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A preemptive scheduling scheme for flexible QoS provisioning in OBS networks

A preemptive scheduling scheme for flexible QoS provisioning...

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2009 6th International Conference on Broadband Communications, Networks and Systems, BROADNETS 2009

作者： Ramantas, Kostas Vargas, Tito Raúl Guerri, Juan Carlos Vlachos, Kyriakos Computer Engineering and Informatics Department Research Academic Computer Technology Institute University of Patras Rio Greece ITEAM Instituto de Telecomunicaciones Y Aplicaciones Multimedia Universidad Politécnica de Valencia Valencia Spain

ISBN: (纸本)9789639799493

In Optical Burst Switching (OBS) networks one of the most challenging problems is to provide service differentiation. The lack of buffering in the intermediate nodes, makes QoS provisioning in OBS networks a difficult problem to address. In this work, we propose a scheduling algorithm that supports QoS based on preemptions, which are controlled by a novel preemption policy. Our claims are validated by analytical modelling and experimental analysis through simulations using data belonging to two different classes of service - best effort and video streaming data. Performance evaluation is based on throughput measurements for best effort class, and perceived quality metrics like PSNR and MOS scores for the video streaming class.

关键词： Quality of service

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Broadband municipal optical networks in Greece: A suitable business model

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Telematics and informatics 2009年第4期26卷 391-409页

作者： Bouras, Christos Gkamas, Apostolos Papagiannopoulos, John Theophilopoulos, George Tsiatsos, Thrasyvoulos Computer Engineering and Informatics Department University of Patras University Campus GR-26500 Rio Greece Research Academic Computer Technology Institute N. Kazanzaki University of Patras Campus GR-26500 Rio Greece Department of Informatics Aristotle University of Thessaloniki PO Box 114 GR-54124 Thessaloniki Greece Department of Information and Communication Systems Engineering University of the Aegean GR-83200 Karlovassi Samos Greece

This paper proposes a business model for the optimal exploitation of the currently developing broadband metropolitan area networks in Greece. Having recorded and examined relevant international practices, we describe in detail the way that these networks should be managed, operated, maintained and expanded. Taking into consideration that these infrastructures will widely alter the broadband map of Greece, that Greece has currently one of the lowest broadband penetration percentages in Europe and that the proper exploitation strategy of the networks to be deployed could boost the demand for broadband connections and applications, the application of the optimal business model appears to be of vital importance. We describe the proposed business model in detail, including ways for expanding the broadband infrastructures, as well as tackling of viability issues regarding the authority responsible for managing the broadband metropolitan networks. © 2009 Elsevier Ltd. All rights reserved.

关键词： Broadband networks

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