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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...

引用

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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The effect of cumulative lookahead on conservative parallel simulation performance

The effect of cumulative lookahead on conservative parallel ...

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19th Annual European Simulation and Modelling Conference, ESM 2005

作者： Solčány, Viliam Šafařík, Jiří Faculty of Informatics and Information Technologies Slovak University of Technology Ilkovičova 3 842 16 Bratislava Slovakia Dept. Computer Science and Engineering University of West Bohemia Univerzitní 8 306 14 Plzeň Czech Republic

ISBN: (纸本)9077381228

This work is in the area of parallel discrete event simulation. We consider a conservatively synchronized parallel simulation where submodels consist of multiple entities, each with some amount of lookahead. We explore the issue of improving the lookahead of a submodel by combining the lookahead abilities of individual entities. We review the concepts and conditions for cumulative lookahead. We provide an experimental evaluation of the effect of cumulative lookahead on simulation performance.

关键词： Discrete event simulation

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"Trust engineering:" from requirements to system design and maintenance - A working national lottery system experience 1

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8th International Conference on Information Security, ISC 2005

作者： Konstantinou, Elisavet Liagkou, Vasiliki Spirakis, Paul Stamatiou, Yannis C. Yung, Moti Computer Technology Institute P.O. Box 1122 26110 Patras Greece Dept. of Comp. Eng. and Informatics University of Patras 26500 Patras Greece Dept. of Mathematics University of Ioannina 45110 Ioannina Greece Computer Science Columbia University New York NY United States RSA Laboratories Bedford MA United States

ISBN: (数字)9783540319306

ISBN: (纸本)354029001X

Based on our experience in designing, building and maintaining an information system for supporting a large scale electronic lottery, we present in this paper a unified approach to the design and implementation of electronic lotteries with the focus on pragmatic trust establishment. This approach follows closely the methodologies commonly employed in the development of general information systems. However, central to the proposed approach is the decomposition of a security critical system into layers containing basic trust components so as to facilitate the management of trust, first along the layers, and then as we move from layer to layer. We believe that such a structured approach, based on layers and trust components, can help designers of security critical applications produce demonstrably robust and verifiable systems that people will not hesitate to use. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Systems analysis

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Scalable parallel octree meshing for terascale applications 05

Scalable parallel octree meshing for terascale applications

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ACM/IEEE 2005 Supercomputing Conference, SC'05

作者： Tu, Tiankai O'Hallaron, David R. Ghattas, Omar Computer Science Department Carnegie Mellon University Pittsburgh PA 15213 United States Department of Electrical and Computer Engineering Carnegie Mellon University PA 15213 United States Institute for Computational Engineering and Sciences Dept. of Geol. Sciences Mechanical Engineering Computer Science and Biomedical Engineering University of Texas Austin TX 78712 United States

ISBN: (纸本)1595930612

We present a new methodology for generating and adapting octree meshes for terascale applications. Our approach combines existing methods, such as parallel octree decomposition and space-filling curves, with a set of new methods that address the special needs of parallel octree meshing. We have implemented these techniques in a parallel meshing tool called Octor. Performance evaluations on up to 2000 processors show that Octor has good isogranular scalability, fixed-size scalability, and absolute running time. Octor also provides a novel data access interface to parallel PDE solvers and parallel visualization pipelines, making it possible to develop tightly coupled end-to-end finite element simulations on terascale systems. © 2005 IEEE.

关键词： Parallel processing systems

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Prototype design of mobile emergency telemedicine system

Prototype design of mobile emergency telemedicine system

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International Conference on Computational science and Its Applications - ICCSA 2005

作者： Yoo, Sun K. Jung, S.M. Kim, B.S. Yun, H.Y. Kim, S.R. Kim, D.K. Dept. of Medical Engineering Yonsei Univ. College of Medicine 134 Shinchon-dong Seodaemun-ku Seoul Korea Republic of Graduate School of Biomedical Engineering Yonsei Univ. 134 Shinchon-dong Seodaemun-ku Seoul Korea Republic of Center for Emergency Medical Informatics Human Identification Research Institute Seoul Korea Republic of Dept. of Computer Science Dongduk Woman's Univ. Seoul Korea Republic of

High bit rate wireless cellular service using CDMA 1X-EVDO is now popular in Korea, particularly in urban areas, since it was launched commercially in 2002. This cellular service allows the real-time transmission of patient images and vital sign signals simultaneously in a moving ambulance application. In this paper, we designed a prototype emergency telemedicine system that can transfer both biological signal and patient motion video from a moving vehicle using a CDMA 1X-EVDO reverse link. To cope with the limited bandwidth of the reverse link (transmission bandwidth of cellular device) relative to the the forward link (receiving bandwidth), priority control between the vital sign and video images, frame rate control using MPEG-4 compression, and error control using automatic repeat request were incorporated into the application layer protocol of the designed prototype system. Many on-road experiments have been performed to evaluate the actual performance and to demonstrate the applicability in a real situation. In most cases, the biological signal and patient video images with reduced frame rate were successfully transmitted from the moving vehicle in urban areas © Springer-Verlag Berlin Heidelberg 2005.

关键词： Telemedicine

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Reseeding-based test set embedding with reduced test sequences

Reseeding-based test set embedding with reduced test sequenc...

引用

IEEE International Symposium on Quality Electronic Design

作者： E. Kalligeros D. Kaseridis X. Kavousianos D. Nikolos Research Academic Computer Technology Institute Patras Greece Computer Eneineerinsr & Informatics Dept. University of Patras. Patras Greece Computer Science Dept. University of Ioannina Ioannina Greece

A novel technique for reducing the test sequences of reseeding-based schemes is presented in this paper. The proposed technique is generic and can be applied to test set embedding or mixed-mode schemes based on various TPG. The imposed hardware overhead is very small since it is confined to just one extra bit per seed plus one very small counter in the scheme's control logic, while the test-sequence-length reductions achieved are up to 44.71%. Along with the test-sequence-reduction technique, an efficient seed-selection algorithm for the test-per-clock, LFSR-based, test set embedding case is presented. The proposed algorithm targets the minimization of the selected seed volumes and, combined with the test-sequence-reduction technique, delivers results with fewer seeds and much smaller test sequences than the already proposed approaches.

关键词： Electronic equipment testing

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Toward 100 MHz frontier: Acousto-optic methods and fiber optic sensors in ultrasound metrology

Toward 100 MHz frontier: Acousto-optic methods and fiber opt...

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34th International Congress on Noise Control Engineering 2005, INTERNOISE 2005

作者： Lewin, P.A. Umchid, S. Andrew Berger, W. Mu, C. Daryoush, A. El-Sherif, M. School of Biomedical Engineering Science and Health Systems Department of Electrical and Computer Engineering Drexel University Philadelphia PA 19104 United States Dept. of Physics and Electrical Engineering University of Scranton Scranton PA 18510-4642 United States

ISBN: (纸本)9781622763399

An increasing number of ultrasound diagnostic systems employ harmonic imaging, and center frequencies as high as 15 MHz are now commonly used in clinical practice. However, currently available hydrophone probes are not fully adequate to characterize the acoustic output of such nonlinear systems. This paper reviews the current status of piezoelectric polymer hydrophone probes and discusses their limitations in ultrasound field measurements (such as limited knowledge of the frequency responses beyond 20 MHz and physical dimensions leading to spatial averaging error). Against this background, a down-tapered fiber optic probe is presented as an alternative tool for probing ultrasound fields with ample bandwidth and without finite aperture effects. The results of the preliminary experiments indicate that once fully developed, the optic probe with a tip diameter of about 7 micrometers will provide a desirable and adequate device for ultrasound field measurements up to 100 MHz. The fiber optic probe could also meet the challenges posed by high intensity focused ultrasound (HIFU) and other therapeutic applications.

关键词： Hydrophones

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A guideline for parameter design of body surface laplacian electrodes and its application in EGG detection

A guideline for parameter design of body surface laplacian e...

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2005 27th Annual International Conference of the Engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： He, Feng Li, Gang Lin, Ling Besio, Walter G. Lu, Stephen C.-Y. Inspiring Technical Laboratory College of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin 300072 China Biomedical Engineering Program Center for Biomedical Engineering and Rehabilitation Science Louisiana Tech University LO United States Dept. of Aerospace and Mechanical Engineering Computer Science and Industrial and Systems Engineering University of Southern California CA 90089-1453

ISBN: (纸本)0780387406

The influence of dimension parameters on the performance of Body-surface Laplacian electrodes is studied in this paper. Some rules about the parameter optimization design are presented. The investigation suggests that the effective radius b should be equal to the inner radius of the ring electrode in order to reduce the relative error. Besides, in the presence of weak bioelectrical signals, reasonably increasing b would be helpful to improve SNR. Furthermore, an evaluation method based on these principles is prompted, as an instance of which, feasibility of introducing Surface Laplacian technique into EGG exploration is discussed. © 2005 IEEE.

关键词： Product design

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The cosmic ray anisotropy observed by the large area air shower experiments

The cosmic ray anisotropy observed by the large area air sho...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Iyono, A. Konishi, T. Morita, T. Nakatsuka, T. Noda, C. Ochi, N. Ohara, S. Okita, M. Okei, K. Ryou, J. Tada, J. Takahashi, N. Tokiwa, M. Tsuji, S. Wada, T. Yamamoto, I. Yamashita, Y. Dept. of Applied Science Okayama University of Science Okayama 700-0005 Japan Dept. of Physics Kinki University Higashi-Osaka 577-8502 Japan Dept. of Physics Okayama University Okayama 700-8530 Japan Okayama Shoka University Okayama 700-8601 Japan Graduate School of Informatics Okayama University of Science 700-0005 Japan Yonago National College of Technology Yonago 683-8502 Japan Nara University of Industry Ikomagun 636-8503 Japan Dept. of Electronic and Info. System Eng. Hirosaki University Hirosaki 036-8560 Japan Dept. of Information Science Kawasaki Medical School Kurashiki 701-0192 Japan Dept. of Info. and Computer Eng. Okayama University of Science Okayama 700-0005 Japan

The cosmic ray anisotropy, calculated in terms of the harmonic analysis of the EAS arrival local sidereal times(LSTs) observed by Large Area Air Shower (LAAS) group, is presented. The amplitude and phase of the first harmonic obtained are 0.23 ± 0.04 % and 0.4 ± 0.7 hr LST in the energy region from 5× 1013 to 1015 eV respectively. The results have also been compared with the model calculation on the basis of the diffusive propagation model of relativistic charged particles. The rigidity dependence of anisotropy amplitudes (δ ∼ R°) is evaluated as α =0.339 ± 0.014.

关键词： Charged particles

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Ontologies for Agents: Theory and Experiences 1

引用

丛书名： Whitestein Series in Software Agent Technologies and Autonomic Computing

2005年

作者： Valentina Tamma Stephen Cranefield Timothy W. Finin Steven Willmott

ISBN: (数字)9783764373610

ISBN: (纸本)9783764372378

There is a growing interest in the use of ontologies for multi-agent system app- cations. On the one hand, the agent paradigm is successfully employed in those applications where autonomous, loosely-coupled, heterogeneous, and distributed systems need to interoperate in order to achieve a common goal. On the other hand, ontologies have established themselves as a powerful tool to enable kno- edge sharing, and a growing number of applications have bene?ted from the use of ontologies as a means to achieve semantic interoperability among heterogeneous, distributed systems. In principle ontologies and agents are a match made in heaven, that has failed to happen. What makes a simple piece of software an agent is its ability to communicate in a ”social” environment, to make autonomous decisions, and to be proactive on behalf of its user. Communication ultimately depends on und- standing the goals, preferences, and constraints posed by the user. Autonomy is theabilitytoperformataskwithlittleornouserintervention,whileproactiveness involves acting autonomously with no need for user prompting. Communication, but also autonomy and proactiveness, depend on knowledge. The ability to c- municate depends on understanding the syntax (terms and structure) and the semantics of a language. Ontologies provide the terms used to describe a domain and the semantics associated with them. In addition, ontologies are often comp- mented by some logical rules that constrain the meaning assigned to the terms. These constraints are represented by inference rules that can be used by agents to perform the reasoning on which autonomy and proactiveness are based.

关键词： Philosophy, general computer science, general computer Systems Organization and Communication Networks Software Engineering/Programming and Operating Systems Programming Techniques Software Engineering

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