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Competitive video on demand schedulers for popular movies

Competitive video on demand schedulers for popular movies

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作者： Bouras, Christos Kapoulas, Vaggelis Pantziou, Grammati Spirakis, Paul Research Academic Computer Technology Institute 2 Riga Feraiou 61 262 21 Patras Greece Department of Computer Engineering and Informatics University of Patras 265 00 Rion-Patras Greece Department of Informatics Technological Education Institute of Athens Ag. Spyridonos Str. 122 10 Egaleo-Athens Greece

In this paper we investigate the online video on demand problem, namely having to accept or reject a request for a movie without knowing the future requests. We present online movie-scheduling schemes that implement the principles of refusal by choice and delayed notification. A novel way to schedule movies that exploits the knowledge of the distribution of the preference of requests for movies, is shown to have a competitive ratio that outperforms all the previously known schemes in practical situations. In fact, our scheduler has a competitive ratio bounded above by a constant, independent of the number of the users, channels, or movies, in the case that a large fraction of the requests tends to concentrate in a small number of movies. We extend our approach by presenting an "adaptive" randomized scheduler which initially is not aware of the movie popularities but it adapts to it, and achieves the same asymptotic competitive ratio. © 2002 Elsevier Science B.V. All rights reserved.

关键词： Competitive ratio Online scheduling algorithm Probability distribution Video on demand

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Pattern recognition of EEG signals during right and left motor imagery 13

Pattern recognition of EEG signals during right and left mot...

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13th IFAC Symposium on System Identification, SYSID 2003

作者： Inoue, Katsuhiro Pfurtscheller, Gert Neuper, Christa Kumamaru, Kousuke Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka820-8502 Japan Department of Medical Informatics Institute of Biomedical Engineering Graz University of Technology Inffeldgasse 16a Graz8010 Austria

Electroencephalograph (EEG) recordings during right and left motor imagery can be used to move a cursor to a target on a computer screen. Such an EEG-based brain-computer interface (BCI) can provide a new communication channel to replace an impaired motor function. It can be used by e.g., handicap users with amyotrophic lateral sclerosis (ALS). In this study, statistical pattern recognition method based on AR model was introduced to discriminate the EEG signals recorded during right and left motor imagery. And learning methods (processing period for parameter estimation, AR order, etc.) were investigated. Finally, the effectiveness of our method was confirmed through the experimental studies. © 2003 International Federation of Automatic Control.

关键词： Brain computer interface

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A sleep-awake protocol for information propagation in smart dust networks

A sleep-awake protocol for information propagation in smart ...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： I. Chatzigiannakis S. Nikoletseas Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece

Smart dust is a set of a vast number of ultra-small fully autonomous computing and communication devices, with very restricted energy and computing capabilities, that co-operate to quickly and efficiently accomplish a large sensing task. Smart dust can be very useful in practice i.e. in the local detection of a remote crucial event and the propagation of data reporting its realization. In this work we continue our effort towards the research on smart dust from a basic algorithmic point of view. Under a simple but realistic model for smart dust we present an interesting problem, which is how to propagate efficiently information on an event detected locally. Then we present anew smart dust protocol, which we call the "Sleep-Awake" protocol, for information propagation that explicitly uses the energy saving features (i.e. the alteration of sleeping and awake time periods) of the smart dust particles. By using both some simple probabilistic analysis and extensive experiments, we provide some first concrete results for the success probability and the time and energy efficiency of the protocol, in terms of parameters of the smart dust network. We note that the study of the interplay of these parameters allows us to program the smart dust network characteristics accordingly.

关键词： Protocols Intelligent networks Intelligent sensors Vehicle dynamics Event detection Sensor systems computer networks Temperature sensors Sensor phenomena and characterization Remote monitoring

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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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A scalable, low-cost VoD server with multicast support

A scalable, low-cost VoD server with multicast support

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International Conference on Information technology: Research and Education (ITRE)

作者： A. Papagiannis S. Egglezos D. Lioupis Department of Computer Engineering & Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

Undoubtedly, video-on-demand technology will play a catalytic role in future entertainment and e-learning systems. The key challenge in VoD domain is to provide interactive services in thousands of potential users at a reasonable cost. We present a scalable, high performance, high availability and low cost VoD system design, based on a cluster of personal computer. The scalability of this design is not restricted to cluster-level, but it can easily be applied to a greater MAN-level. The experimental measurements indicated that our design can support simultaneously 90, 170 or 240 high quality video streams for implementations with 1, 2 or 3 server nodes respectively. We show, using queuing theory analysis that these figures correspond to thousands of real users. We also present a multicast method that further enriches our design increasing its reliability in periods of high demand.

关键词： Scalability Switches Costs Availability Microcomputers Video on demand Control systems Load management Communication switching informatics

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Performance evaluation of the managed bandwidth service with QoS guarantees 03

Performance evaluation of the managed bandwidth service with...

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International Workshop/Symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： C. Bouras V. Kapoulas D. Primpas Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

ISBN: (纸本)9780769520360

This paper describes a solution to extend the managed bandwidth service (MBS), which is provided on a backbone network using MPLS VPN, to non-MPLS domains and also evaluates it. It is based on the class based weighted fair queuing mechanism (CBWFQ) and describes the way it should be implemented to provide guaranteed bandwidth connections. In particular, CBWFQ can provide assured bandwidth connections when simultaneously leads to efficient bandwidth utilization. In addition, the proposed solution is being tested on simulation environment (using the network simulator) in order to evaluate its performance characteristics. On the simulation tests had been reserved specific amount of bandwidth for specific flows and their throughput was measured in order to understand if the proposed solution works well. Finally, the results are very well and prove that this method can guarantee bandwidth for every flow in all network conditions (congested or uncongested). At last, the paper presents a technical example of router configuration for implementing the MBS service according to the basic proposed solution.

关键词： Bandwidth Virtual private networks Multiprotocol label switching Traffic control Asynchronous transfer mode Telecommunication traffic Quality of service computer networks technology management Spine

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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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Building e-learning communities: the case of VirraD

Building e-learning communities: the case of VirRAD

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International Conference on Advanced Learning Technologies (ICALT)

作者： Ch. Bouras El. Giannaka V. Kapoulas M. Nani Th. Tsiatsos Computer Engineering and Informatics Department (CEID) University of Patras Greece Research Academic Computer Technology Institute Greece

We discuss the development of virtual communities and especially e-learning communities. In particular, we are inspired by VirraD European project, and we present the intermediate results that have raised from the def... 详细信息

关键词： Electronic learning computer aided software engineering computer aided instruction Courseware Collaborative work informatics Environmental economics Virtual reality Vocational training Professional communication

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An efficient BIST scheme for high-speed adders

An efficient BIST scheme for high-speed adders

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IEEE Symposium on On-Line Testing (IOLTS)

作者： D.G. Nikolos D. Nikolos H.T. Vergos C. Efstathiou Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece Informatics Department TEI Athens Athens Greece

In this paper we present a new pseudorandom BIST scheme for high-speed adders. Under this scheme an adder is simultaneously used as a test pattern generator and as a response compactor during its own testing. The main advantages of the proposed scheme, compared to prior methods, are minimal performance penalty, small hardware overhead and the benefits of at-speed testing.

关键词： Built-in self-test Circuit testing Adders Circuit faults Hardware Automatic testing Integrated circuit testing Test pattern generators Fault detection informatics

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Efficient BIST schemes for RNS datapaths

Efficient BIST schemes for RNS datapaths

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IEEE International Symposium on Circuits and Systems (ISCAS)

It has recently been shown that accumulators can be used efficiently for test pattern generation as well as for test response compaction. In this paper we present a BIST scheme for accumulators where the accumulator is simultaneously used as a test pattern generator and a response compactor during its own testing. We also show that the proposed BIST scheme is especially suitable for accumulator, adder and multiplier-accumulator RNS channels leading to minimal hardware overhead and short test sequences.

关键词： Built-in self-test Circuit testing Hardware Test pattern generators Automatic testing Integrated circuit testing Adders Digital signal processing Delay informatics

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