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Performance of adaptive multimedia transmission: The case of unicast technique

Performance of adaptive multimedia transmission: The case of...

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5th International Network Conference, INC 2005

作者： Bouras, Ch. Gkamas, A. Greece - Computer Engineering and Informatics Dept. Research Academic Computer Technology Institute Univ. of Patras Greece

ISBN: (纸本)9781841022727

Unicast mechanisms for the adaptive transmission of multimedia data can be used for the transmission of multimedia data over heterogeneous networks, like the Internet with the use of one unicast stream for each receiver. Those mechanisms have the capability to adapt the transmission of the multimedia data to network changes. In this paper, we describe a unicast mechanism for adaptive transmission of multimedia data, which is based on real time protocols. The proposed mechanism can be used for unicast transmission of multimedia data over heterogeneous networks, like the Internet, and has the capability to adapt the transmission of the multimedia data to network changes. Moreover, the proposed mechanism uses a "friendly" to the network users congestion control policy to control the transmission of the multimedia data. We evaluate the adaptive multicast transmission mechanism and we compare it with a number of similar mechanisms available to the literature (LBA, RAP, and TFRCP). © 2005 University of the Aegean and University of Plymouth.

关键词： Transmission control protocol

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New architectures for modulo 2N - 1 Adders

New architectures for modulo 2N - 1 Adders

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12th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2005

作者： Dimitrakopoulos, G. Nikolos, D.G. Vergos, H.T. Nikolos, D. Efstathiou, C. Technology and Computer Architecture Lab Computer Engineering and Informatics Dept. University of Patras 26500 Patras Greece Informatics Department ATEI of Athens 12210 Egaleo Athens Greece

ISBN: (纸本)9789972611001

Two architectures for parallel-prefix modulo 2n - 1 adders are presented in this paper. For large wordlengths we introduce the sparse modulo 2n - 1 adders that achieve significant reduction of the wiring complexity without imposing any delay penalty. Then, the Ling-carry formulation of modulo 2n - 1 addition is presented. Ling modulo adders save one logic level of implementation and provide high-speed solutions for smaller adder widths, where wiring complexity is small. The performance of the proposed adders has been validated with static CMOS implementations. In all examined cases, the proposed designs achieve significant savings in both area and delay compared to previously published architectures.

关键词： Adders

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Research on Optical Core Networks in the e-Photon/ONe Network of Excellence

Research on Optical Core Networks in the e-Photon/ONe Networ...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： F. Callegati J. Aracil L. Wosinska N. Andriolli D. Careglio A. Giorgetti J. Fdez-Palacios C. Gauger M. Klinkowski O. Gonzales de Dios G. Hu E. Karasan F. Matera H. Overby C. Raffaelli L. Rea N. Sengezer M. Tornatore K. Vlachos D.E.I.S Unversity of Bologna Bologna Italy Escuela Politecnica Superior Universidad Autonoma de Madrid Madrid Spain Royal Institute of Technology (KTH) School of Information and Communication Technology (ICT) Kista Sweden Scuola Superiore Sant'Anna Pisa Italy Univeristat Politcnica de Catalunya Barcelona Spain Telefónica Investigación y Desarrollo Madrid Spain University of Stuttgart IKR Stuttgart Germany Bilkent Universitesi Elektrik Elektronik Muhendisligi Ankara Turkey Fondazione Ugo Bordoni Roma Italy University of Science and Technology Norway Dipartimento di Elettronica e Informazione Politecnico di Milano Milano Italy Computer Engineering and Informatics Dept University of Patras Rio Greece

This papers reports the advances in optical core networks research coordinated in the framework of the e- photon/ONe and e-photon/ONe+ networks of excellence.

关键词： Optical fiber networks Telecommunication traffic Protection Circuits Europe Integrated optics instruments Transfer functions IP networks Communications technology

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An experimental study of algorithms for fully dynamic transitive closure

An experimental study of algorithms for fully dynamic transi...

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13th Annual European Symposium on Algorithms, ESA 2005

作者： Krommidas, Ioannis Zaroliagis, Christos Computer Technology Institute P.O. Box 1122 26110 Patras Greece Dept of Computer Engineering and Informatics University of Patras 26500 Patras Greece

We have conducted an extensive experimental study on some recent, theoretically outstanding, algorithms for fully dynamic transitive closure along with several variants of them, and compared them to pseudo fully dynamic and simple-minded algorithms developed in a previous study. We tested and compared these implementations on random inputs, synthetic (worst-case) inputs, and on inputs motivated by real-world graphs. Our experiments reveal that some of the fully dynamic algorithms can really be of practical value in many situations. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Algorithms

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Semantic learning interventions using web services technology

Semantic learning interventions using web services technolog...

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

作者： Adamopoulou, Poulia Kanellopoulos, Dimitrios Sakkopoulos, Evangelos Tsakalidis, Athanasios Computer Engineering and Informatics Dept. University of Patras 26500 Patras Greece Research Academic Computer Technology Institute 61 Riga Feraiou Str. 26110 Patras Greece Electrical Engineering and Computer Technology Dept University of Patras 26500 Patras Greece

ISBN: (纸本)0889864802

In science learning, cognitive concepts that are distinguished for the complexity of their structure and operation can be understood by using successful metaphors. Conventional instruction is ineffective in dealing with misconceptions. We propose a semantic learning interventions management system that utilizes web services technology. The proposed system aims to be an integrated educational solution that offers interoperable, web service-based, cross-platform learning services. It extends the available educational logic and content by publishing and consuming educational web services. Additionally, the combination of Web Services and Semantic Web offers sophisticated capabilities including automated discovery, composition, invocation, and monitoring.

关键词： Web services

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Research on optical core networks in the e-Photon/ONe network of excellence

Research on optical core networks in the e-Photon/ONe networ...

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INFOCOM 2006: 25th IEEE International Conference on computer Communications

作者： Callegati, F. Aracil, J. Wosinska, L. Andriolli, N. Careglio, D. Giorgetti, A. Fdez-Palacios, J. Gauger, C. Klinkowski, M. Gonzáles De Dios, O. Hu, G. Karasan, E. Matera, F. Overby, H. Raffaelli, C. Rea, L. Sengezer, N. Tornatore, M. Vlachos, K. D.E.I.S. Unversity of Bologna Viale Risorgimento 2 40123 Bologna Italy Escuela Politecnica Superior Universidad Autonoma de Madrid Campus de Cantoblanco 28049 Madrid Spain Isafjordsgatan 24 164 40 Kista Sweden Scuola Superiore sant'Anna Via Moruzzi 1 56124 Pisa Italy Univeristat Politcnica de Catalunya Jordi Girona 1-3 08034 Barcelona Spain Telefónica Investigación y Desarrollo C/ Emilio Vargas N 6 28043 Madrid Spain University of Stuttgart IKR Pfaffenwaldring 47 70569 Stuttgart Germany Bilkent Universitesi Elektrik Elektronik Muhendisligi PK:06800 Ankara Turkey Fondazione Ugo Bordoni via B. Castiglione 59 00142 Roma Italy Norwegian University of Science and Technology O. S. Bragstadsplass 2B Norway Dipartimento di Elettronica e Informazione Politecnico di Milano Via Ponzio 34/5 20133 Milano Italy Computer Engineering and Informatics Dept. University of Patras GR26500 Rio Greece

This papers reports the advances in Optical Core networks research coordinated in the framework of the e-Photon/ONe and e-Photon/ONe+ networks of excellence.

ISBN: (纸本)1424402212

This papers reports the advances in Optical Core networks research coordinated in the framework of the e-Photon/ONe and e-Photon/ONe+ networks of excellence.

关键词： Optical communication

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QoS issues in a large-scale IPv6 network

QoS issues in a large-scale IPv6 network

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International Symposium on Performance Evaluation of computer and Telecommunication Systems 2005, SPECTS 2005, Part of the 2005 Summer Simulation Multiconference, SummerSim 2005

作者： Bouras, Christos Primpas, Dimitris Stamos, Kostas Research Academic Computer Technology Institute PO Box 1122 Patras Greece Computer Engineering and Informatics Dept. Univ. of Patras GR-26500 Patras Greece

ISBN: (纸本)9781622763504

This paper presents our work in the framework of the 6NET project, regarding the design, implementation and testing of a QoS service in a large-scale IPv6 network. The DiffServ mechanism for providing QoS guarantees, is generally preferred over IntServ. However, the current support for QoS mechanisms in IPv6 implementations still lags behind QoS support in IPv4. Furthermore, the new Internet Protocol introduces a different network environment in many aspects and therefore the QoS services should be specifically designed and evaluated for IPv6. In order to evaluate this different behaviour, large-scale experiments have been carried out within the scope of the 6NET project. This paper describes the results from the experimentation with the DiffServ mechanism on a large-scale native IPv6 network that aims to service aggregates of real time traffic with minimum delay, jitter and packet loss.

关键词： Quality of service

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From rate-distortion analysis to resource-distortion analysis

From rate-distortion analysis to resource-distortion analysi...

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2005 International Conference on Wireless Networks, Communications and Mobile Computing

作者： He, Zhihai Chen, Chang Wen Dept. of Electrical and Computer Engineering University of Missouri Columbia MO 65211 Dept. of Electrical and Computer Engineering Florida Inst. of Technology Melbourne FL

ISBN: (纸本)0780393058

The ultimate goal in communication system design is to control and optimize the system performance under resource constraints. As the communication paradigm evolves from the conventional desktop computing, wired, and centralized communication to current mobile, wireless, distributed, and massive communication, video encoding and transmission operate under more and more resource constraints. Therefore, there is a need to extend the traditional R-D analysis to resource-distortion analysis by incorporating the new resource constraints into the R-D analysis framework. In distributed and massive wireless video sensor networks, the resource utilization behaviors of individual video sensors should be well-coordinated through network-level rate allocation and optimum routing so as to maximize the overall performance. © 2005 IEEE.

关键词： Wireless telecommunication systems

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A decision feedback scheme for multimedia transmission over 3G mobile networks

A decision feedback scheme for multimedia transmission over ...

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International Conference on Wireless and Optical Communications Networks

作者： Alexiou, AG Bouras, CJ Igglesis, VG Research Academic Computer Technology Institute Greece Patras 26221 Riga Feraiou 61 Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece Patras 26221 Riga Feraiou 61 Greece

ISBN: (纸本)0780390199

UNITS, the successor of GSM, is evolving toward a future wireless all-IP network. In this paper we present how it supports real-time 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 UNITS, raising a number of novel requirements in both telecommunication and data communication systems. This scheme applies when the mobile user is experiencing real time multimedia content. In this paper, we describe the design and the implementation of a decision feedback scheme, which is based on real time protocols and it is used for streaming video over UNITS transport channels. The decision feedback scheme uses a friendly, to the mobile users, congestion control mechanism to control the transmission rate of the real time video sequence. Furthermore, we evaluate this mechanism through a number of experiments. During these experiments we demonstrate the friendly behavior of the decision feedback scheme to TCP and UDP data streams that coexist in the same channel with the video sequence.

关键词： adaptive multimedia transmission multimedia over UMTS H.263 streaming media in wireless networks

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Techniques for DiffServ-based QoS in hierarchically federated MAN networks -the GRNET case

Techniques for DiffServ-based QoS in hierarchically federate...

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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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