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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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Owl: Next generation system monitoring

Owl: Next generation system monitoring

引用

2005 Computing Frontiers Conference

作者： Schulz, Martin Lee, Hsien-Hsin S. White, Brian S. McKee, Sally A. Jeitner, Jürgen Center for Applied Scientific Computing Lawrence Livermore National Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Computer Systems Lab. Cornell University Department of Informatics Technische Universität München

ISBN: (纸本)1595930183

As microarchitectural and system complexity grows, comprehending system behavior becomes increasingly difficult, and often requires obtaining and sifting through voluminous event traces or coordinating results from multiple, non-localized sources. Owl is a proposed framework that overcomes limitations faced by traditional performance counters and monitoring facilities in dealing with such complexity by pervasively deploying programmable monitoring elements throughout a system. The design exploits reconfigurable or programmable logic to realize hardware monitors located at event sources, such as memory buses. These monitors run and writeback results autonomously with respect to the CPU, mitigating the system impact of interrupt-driven monitoring or the need to communicate irrelevant events to higher levels of the system. The monitors are designed to snoop any kind of system transaction, e.g., within the core, on a bus, across the wire, or within I/O devices. Copyright 2005 ACM.

关键词： Monitoring

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Power conservation schemes for energy efficient data propagation in heterogeneous wireless sensor networks

Power conservation schemes for energy efficient data propaga...

引用

Annual Symposium on Simulation

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

We propose, implement and evaluate new energy conservation schemes for efficient data propagation in wireless sensor networks. Our protocols are adaptive, i.e. locally monitor the network conditions and accordingly adjust towards optimal operation choices. This dynamic feature is particularly beneficial in heterogeneous settings and in cases of redeployment of sensor devices in the network area. We implement our protocols and evaluate their performance through a detailed simulation study using our extended version of ns-2. In particular we combine our schemes with known communication paradigms. The simulation findings demonstrate significant gains and good trade-offs in terms of delivery success, delay and energy dissipation.

关键词： Energy efficiency Intelligent networks Wireless sensor networks computer networks Protocols Power engineering computing Condition monitoring Distributed computing Network topology Data engineering

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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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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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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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KoVer : a sophisticated residue arithmetic core generator

KoVer : a sophisticated residue arithmetic core generator

引用

International Workshop on Rapid System Prototyping (RSP)

作者： N. Kostaras H.T. Vergos Department of Computer Engineering & Informatics University of Patras Rio Greece Computer Technology Institute Patras Greece

Numerous architectures have been recently proposed for residue arithmetic components, each with its own speed, area and power consumption characteristics. In this paper, we present KoVer, a novel software tool that gives a designer the opportunity to explore several architectures for implementing his residue arithmetic blocks, select the one that best suits his goals and instantly get the HDL level description of the selected architecture.

关键词： computer architecture Hardware design languages Power engineering computing Digital arithmetic Energy consumption TCPIP Cryptography Power engineering and energy informatics Software tools

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Towards structural computing design 05

Towards structural computing design

引用

2005 Symposia on Metainformatics, MIS '05

作者： Gkotsis, George Tzagarakis, Manolis Vaitis, Michail Department of Computer Engineering and Informatics University of Patras GR-265 00 Patras Greece Research-Academic Computer Technology Institute Riga Ferraiou 61 GR-262 21 Patras Greece Department of Geography University of the Aegean University Hill GR-811 00 Mytilene Greece

ISBN: (纸本)9781595937193

Structural computing consists of both theory and practices to support all hypertext domains in a native way. Component-Based Open Hypermedia Systems (CB-OHS) constitute the incarnation of this discipline. Nevertheless, CB-OHSs lack support for hypermedia design. This paper describes the process of structural analysis. Moreover, it studies the design of a UML class diagram by examining popular hypertext systems, asserts the significance of this approach in structural computing and presents some discoveries found. © 2005 ACM.

关键词： Hypertext systems

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Design and implementation of an end tidal CO2 simulator for the evaluation of clinical gas analysers

Design and implementation of an end tidal CO2 simulator for ...

引用

42nd Annual Rocky Mountain Bioengineering Symposium and 42nd International ISA Biomedical Sciences Instrumentation Symposium

作者： Shakya, Kabita Deegan, Catherine Hegarty, Fran Markham, Charles School of Informatics and Engineering Institute of Technology Blanchardstown Department of Medical Physics and BioEngineering St James's Hospital Dublin 2 Department of Computer Science National University of Ireland Maynooth

This paper presents a new technique to determine the dynamic and frequency response of capnographs using a custom built 'EtCO2 simulator system'. Capnographs are devices that use CO2 from a patients' expired breath to monitor the cardiopulmonary status during anaesthesia and mechanical ventilation. Capnographs at present are routinely calibrated via a static calibration method only. The dynamic response of the capnographs is not accounted for. The frequency and time response are important as they determine if capnographs can be used in high frequency and pediatric ventilation schemes. Experiments performed using the method described in this paper proved that old capnographs usually do not satisfy the manufacturer quoted specifications for time and frequency response. Therefore, a routine check for capnographs is recommended. The method can also be used to verify manufacturer quoted specifications. The EtCO2 simulator system, designed and constructed simulates human respiration cycle. The gas sources used are 5% CO2 and room air that can be switched alternatively. Both supplies are pressure regulated and connected through non-return valves to electric valves. The valves are microprocessor controlled and the on/off time is user defined allowing a wide range of waveforms to be simulated. The output from the simulator is delivered to capnograph. Capnograms are captured by digital video recording. The captured video in 'avi' file format is then converted into individual frames. These frames are converted into digital data through image processing in Matlab. The data obtained is subjected to extensive analysis to determine the frequency and time response of the respective capnograph. Copyright 2005 ISA. All Rights Reserved.

关键词： Simulators

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