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High performance and grid computing based hydraulic simulations using the clement formula

High performance and grid computing based hydraulic simulati...

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11th international conference on computing and Control for the Water Industry, CCWI 2011

作者： Pezzi, Guilherme Peretti Vaissié, Evelyne Viala, Yann Grawitz, Bruno Bonnadier, Frédéric Gourbesville, Philippe INRIA Sophia Antipolis France Société du Canal de Provence France Université de Nice Sophia Antipolis France

ISBN: (纸本)0953914089

Optimization of water distribution is a crucial issue which has been targeted by many modelling tools. Useful models, implemented several decades ago, need to be updated and implemented in more powerful computing environments. this paper presents the redesign of a legacy hydraulic simulation software written in Fortran (IRMA) that has been used for over 30 years by the Société du Canal de Provence in order to design and to maintain water distribution networks. IRMA was developed aiming mainly the treatment of irrigation networks - by using the Clément demand model and is now used to manage more than 6.000 km of piped networks. the growing complexity and size of networks requested to update IRMA and to rewrite the code by using modern tools and language (Java). the paper presents an overview of IRMA's simulation model, including its head loss equations, equipments modeling and the linear system construction. the description of the new adopted solution is compared with available Java solvers. Some new specific simulation features are presented: scenarios with probabilistic demands (Débit de Clément), pump profiling and pressure driven analysis. the validation of results is achieved with a comparison between the previous Fortran results and the values obtained using the new solver and a comparison with results obtained from a standard and well-known simulation tool (EPANET). Finally, a benchmark of the new Java version and of the former Fortran version is presented. the new version demonstrates clearly its efficiency with a significant reduction of the computation time and an improved quality of results. In addition, the new version offers the possibility of deploying distributed simulations on a computational Grid.

关键词： Linear systems

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An analysis of personal collections among users of social media 11

An analysis of personal collections among users of social me...

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Proceedings of the 11th annual international ACM/IEEE joint conference on Digital libraries

作者： Bogen II, Paul Logasa Shipman, Frank Furuta, Richard Center for the Study of Digital Libraries Department of Computer Science and Engineering Texas A and M University College Station TX 77843 United States

ISBN: (纸本)9781450307444

We have been developing a system to support the management of collections of web-based resources called the distributed Collection Manager (DCM). As work on DCM has progressed, questions about the characteristics of people's collections of web pages have arisen. Simultaneously, work in the area of social media technology has ignored investigating how people are trying to maintain their collections. In order to address these concerns, we performed an online user study of 125 individuals from a variety of online and offline communities. From this study we were able to examine the needs for a system to manage web-based distributed collections, how current tools affect maintenance, and the characteristics of current practices and problems in maintaining web-based collections. © 2011 Authors.

关键词： Social networking (online)

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Synchronous and Asynchronous distributed computing for Financial Option Pricing

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11th international conference on Computational Science and Its Applications (ICCSA)

作者： Garcia, thierry Chau, Ming Spiteri, Pierre ENSEEIHT INP IRIT BP 71222 Rue Camichel F-31071 Toulouse France Adv Solut Accelerator F-34170 Clapiers France

ISBN: (纸本)9783642218866;9783642218873

this paper deals with the numerical solution of financial applications, more specifically the computation of American and European options derivatives modeled by boundary value problems. In such applications we have to solve large-scale algebraic linear systems. We concentrate on synchronous and asynchronous parallel iterative algorithms carried out on Grid'5000, by using an experimental peer-to-peer platform. the properties of the operators arising in the discretized problem ensure the convergence of the parallel iterative synchronous and asynchronous algorithms. Different detection convergence algorithms are tested for asynchronous iterations. Computational experiments performed on distributed architectures are presented and analyzed.

关键词： Parallel asynchronous algorithms distributed computing iterative numerical methods European options derivatives American options derivatives

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Proteins Separation in distributed Environment Computation

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11th international conference on Computational Science and Its Applications (ICCSA)

作者： Chau, Ming Garcia, thierry Spiteri, Pierre Adv Solut Accelerator 199 Rue Oppidum F-34170 Castelnau Le Lez France INP ENSEEIHT IRIT BP 7122 F-31071 Toulouse France

ISBN: (纸本)9783642218866;9783642218873

In the present study we consider the parallel simulation on a peer-to-peer demonstrator for the computation of a 3D differential equations, which model the behavior of the continuous-flow electrophoresis problem. the physical model considered is constituted by the Navier-Stokes equation coupled with a convection-diffusion equation and a Laplacian equation. By using appropriate discretization of the coupled boundary value problems, we can prove the convergence of synchronous and more generally asynchronous relaxation methods. Finally parallel experiments on the peer-to-peer demonstrator are presented and analyzed.

关键词： Parallel computing distributed computing continuous-flow electrophoresis asynchronous iteration PISO algorithm

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A V2X-based approach for reduction of delay propagation in vehicular Ad-Hoc networks

A V2X-based approach for reduction of delay propagation in v...

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2011 11th international conference on ITS Telecommunications, ITST 2011

作者： Mostafa, Ahmad Vegni, Anna Maria Singoria, Rekha Oliveira, Talmai Little, thomas D.C. Agrawal, Dharma P. School of Computing Sciences and Informatics Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH United States Department of Applied Electronics University of Roma Tre Rome Italy Department of Electrical and Computer Engineering Boston University Boston MA United States

ISBN: (纸本)9781612846712

In this paper we investigate the time delay propagation rates in a Vehicular Ad-Hoc Network, where vehicular connectivity is supported by both Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) protocols. In our vision, seamless connectivity issues in a VANET with nearby network infrastructure, can be fixed by an opportunistic choice of a vehicular protocol between V2V and V2I. Such a decision is taken by each vehicle whenever it needs to transmit messages. Our technique called as Vehicle-to-X represents a handoff procedure between V2V and V2I, and vice versa, in order to keep vehicles connected independent of mobility issues and traffic scenarios. We investigate the time delay as a performance metric for protocol switching, and present the time propagation rates which occur when vehicles are transmitting warning messages, via V2V or V2I. Simulation results show how the simultaneous usage of pre-existing network infrastructure, together with inter-vehicular communications, provides low delays;while traditional opportunistic vehicular communications increases the transmission time delays and does not guarantee seamless connectivity to vehicles. © 2011 IEEE.

关键词： Vehicular ad hoc networks

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Fast Download but Eternal Seeding: the Reward and Punishment of Sharing Ratio Enforcement

Fast Download but Eternal Seeding: The Reward and Punishment...

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11th IEEE international conference on Peer-to-Peer computing (P2P)

作者： Jia, Adele L. Rahman, Rameez Vinko, Tamas Pouwelse, Johan A. Epema, Dick H. J. Delft Univ Technol Parallel & Distributed Syst Grp Dept Comp Sci NL-2600 AA Delft Netherlands

ISBN: (纸本)9781457701498

Many private BitTorrent communities employ Sharing Ratio Enforcement (SRE) schemes to incentivize users to contribute their upload resources. It has been demonstrated that communities that use SRE are greatly oversupplied, i.e., they have much higher seeder-to-leecher ratios than communities in which SRE is not employed. the first order effect of oversupply under SRE is a positive increase in the average downloading speed. However, users are forced to seed for extremely long times to maintain adequate sharing ratios to be able to start new downloads. In this paper, we propose a fluid model to study the effects of oversupply under SRE, which predicts the average downloading speed, the average seeding time, and the average upload capacity utilization for users in communities that employ SRE. We notice that the phenomenon of oversupply has two undesired negative effects: a) Peers are forced to seed for long times, even though their seeding efforts are often not very productive (in terms of low upload capacity utilization);and b) SRE discriminates against peers with low bandwidth capacities and forces them to seed for longer durations than peers with high capacities. To alleviate these problems, we propose four different strategies for SRE, which have been inspired by ideas in social sciences and economics. We evaluate these strategies through simulations. Our results indicate that these new strategies release users from needlessly long seeding durations, while also being fair towards peers with low capacities and maintaining high system-wide downloading speeds.

关键词： Analytical models Bandwidth BitTorrent community Communities IEEE Communications Society Peer to peer computing SRE average seeding time SRE average upload capacity utilization SRE downloading speed SRE fluid model Steady-state thin film transistors oversupply phenomenon peer-to-peer computing protocols seeder-to-leecher ratio sharing ratio enforcement

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Slot Selection and Co-allocation for Economic Scheduling in distributed computing

Slot Selection and Co-allocation for Economic Scheduling in ...

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11th international conference on Parallel computing Technologies

作者： Toporkov, Victor Bobchenkov, Alexander Toporkova, Anna Tselishchev, Alexey Yemelyanov, Dmitry Moscow Power Engn Inst Dept Comp Sci Ul Krasnokazarmennaya 14 Moscow 111250 Russia Moscow State Inst Elect & Math Moscow 109028 Russia CERN CH-1211 Geneva Switzerland

ISBN: (纸本)9783642231773

In this paper, we present slot selection algorithms for job batch scheduling in distributed computing with non-dedicated resources. Jobs are parallel applications and these applications are independent. Existing approaches towards resource co-allocation and job scheduling in economic models of distributed computing are based on search of time-slots in resource occupancy schedules. A launch of a parallel job requires a co-allocation of a specified number of slots. the sought time-slots must match requirements of necessary span, computational resource properties, and cost. Usually such scheduling methods consider only one suited variant of time-slot set. this paper discloses a scheduling scheme that features multi-variant search. Two algorithms of linear complexity for search of alternative variants are proposed. Having several optional resource configurations for each job makes an opportunity to perform an optimization of execution of the whole batch of jobs and to increase overall efficiency of scheduling.

关键词： Scheduling co-allocation slot resource request job batch task

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PMBS'11 - Proceedings of the 2nd international Workshop on Performance Modeling, Benchmarking and Simulation of High Performance computing Systems, Co-located with SC'11

PMBS'11 - Proceedings of the 2nd International Workshop on P...

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2nd Int. Workshop on Performance Modeling, Benchmarking and Simulation of High Performance computing Systems, PMBS'11, Held as Part of the 24th ACM/IEEE international conference for High Performance computing, networking, Storage and Analysis, SC'11

ISBN: (纸本)9781450311021

the proceedings contain 13 papers. the topics discussed include: evaluating interconnect and virtualization performance for high performance computing;predictive modeling and analysis of OP2 on distributed memory GPU clusters;optimizing matrix transposes using a POWER7 cache model and explicit prefetching;towards autotuning by alternating communication methods;execution-less performance modeling;a preliminary evaluation of the hardware acceleration of the Cray Gemini interconnect for PGAs languages and comparison with MPI;auto-generation of communication benchmark traces;a method for automatically generating analogue benchmark suites using micro architectural event counters;critical path-based thread placement for NUMA systems;benchmarking and modeling disk-based storage tiers for practical storage design;and memory access cycle and the measurement of memory systems.

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AADMLSS practice: A culturally relevant algebra tutor

AADMLSS practice: A culturally relevant algebra tutor

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international conference on Advanced Learning Technologies

作者： Wang, Lingyan Moses, Wanda Ekandem, Joshua Gilbert, Juan E. Computer Science and Software Engineering Auburn University Auburn AL United States School of Computing Clemson University Clemson SC United States

ISBN: (纸本)9780769543468

this paper presents an online web-based culturally relevant algebra tutor. It is designed for African American students to improve their mathematical skills. As a critical part of a culturally relevant tutor framework, AADMLSS (African-American distributed Multiple Learning Styles System) focuses on practicing algebra, but can be adapted to other courses. the Algebra Problems Practice (APP) module is the practice environment where students can extract an algebra problem and practice solving it through interaction with a 3D virtual tutor. Practice on this system, tailored with familiar cultural elements, is expected to improve students' ability and skills in mathematics. © 2011 IEEE.

关键词： Algebra

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Multi-sensor data fusion within the belief functions framework application to smart home services

Multi-sensor data fusion within the belief functions framewo...

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11th international conference on Next Generation Teletraffic and Wired/Wireless Advanced networking, NEW2AN 2011 and 4th conference on Smart Spaces, ruSMART 2011

作者： Pietropaoli, Bastien Dominici, Michele Weis, Frédéric INRIA Rennes-Bretagne Atlantique Campus Universitaire de Beaulieu 35042 Rennes Cedex France IRISA Université de Rennes 1 Campus Universitaire de Beaulieu 35042 Rennes Cedex France

ISBN: (纸本)9783642228742

In Smart Home, understanding the environment and what is going on is the basis of all adapted services. Unfortunately, inferring situations and activity recognition directly from raw data is way too complex to be applied. Firstly, we present a layered architecture we are building to process raw data into abstract situations and activities. Secondly, data fusion tools using the belief functions theory are introduced as a general framework to provide a first level of abstraction from raw data given by sensors to a more complex context model. then a methodology to apply the model to our Smart Home within the belief functions framework, a first implementation and the encountered issues in modeling are discussed. © Springer-Verlag Berlin Heidelberg 2011.

关键词： Ubiquitous computing

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