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检索条件"任意字段=Applied Computing 2004 - Proceedings of the 2004 ACM Symposium on Applied Computing"

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VIRACOCHA: An Efficient Parallelization Framework for Large-Scale CFD Post-Processing in Virtual Environments 04

VIRACOCHA: An Efficient Parallelization Framework for Large-...

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2004 acm/IEEE Conference on Supercomputing, SC 2004

作者： Gerndt, Andrea Hentschel, Bernd Wolter, Marc Kuhlen, Torsten Bischof, Christian RWTH Aachen University Center for Computing and Communication Germany

ISBN: (纸本)0769521533

One recommended strategy for the analysis of CFD-data is the interactive exploration within virtual environments. Common visualization systems are unable to process large data sets while carrying out real-time interaction and visualization at the same time. The obvious idea is to decouple flow feature extraction from visualization. This paper covers the functionality of the parallel CFD post-processing toolkit Viracocha. Two aspects are discussed in more detail. The first approach covers strategies to reduce the loading time. Data caching and prefetching are employed to reduce access time. The second aspect concerns an approach called streaming that minimizes the time a user has to wait for first results. Viracocha already sends coarse intermediate data back to the virtual environment before the final result is available. Different streaming and data handling strategies are described. In order to emphasize the benefit of our implementation efforts, some strategies are applied to multi-block CFD data sets. © 2004 IEEE.

关键词： Virtual reality

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Augmenting conversations using dual-purpose speech

Augmenting conversations using dual-purpose speech

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UIST: proceedings of the Annual acm symposium on User Interface Software and Technology

作者： Lyons, Kent Skeels, Christopher Starner, Thad Snoeck, Cornelis M. Wong, Benjamin A. Ashbrook, Daniel College of Computing GVU Center Georgia Institute of Technology Atlanta GA 30332-0280 United States

In this paper, we explore the concept of dual-purpose speech: speech that is socially appropriate in the context of a human-to-human conversation which also provides meaningful input to a computer. We motivate the use of dual-purpose speech and explore issues of privacy and technological challenges related to mobile speech recognition. We present three applications that utilize dual-purpose speech to assist a user in conversational tasks: the Calendar Navigator Agent, DialogTabs, and Speech Courier. The Calendar Navigator Agent navigates a user's calendar based on socially appropriate speech used while scheduling appointments. DialogTabs allows a user to postpone cognitive processing of conversational material by proving short-term capture of transient information. Finally, Speech Courier allows asynchronous delivery of relevant conversational information to a third party. © 2004 acm.

关键词： Speech recognition

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Software, architecture, and participatory design

Software, architecture, and participatory design

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WISER 2004 - acm Workshop on Interdisciplinary Software Engineering Research

作者： Rank, Stephen Boldyreff, Cornelia O'Coill, Carl Doughty, Mark Faculty of Applied Computing Sciences University of Lincoln United Kingdom School of Architecture University of Lincoln United Kingdom

ISBN: (纸本)1581139888

Much work in software architecture has been inspired by work in physical architecture, in particular Alexander's work on 'design patterns'. By contrast, Alexander's work is little-used in town planning and architecture. In this paper, we examine some of the reasons that this is so, describe some parallels and differences between the fields of physical and software architecture, and identify areas in which future collaboration may be fruitful. The notion of 'participatory design' is important in software engineering and in urban re-generation, but the participatory mechanisms in each field are quite different. Copyright 2004 acm.

关键词： Software engineering

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Demonstration abstract: BNF converter

Demonstration abstract: BNF converter

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proceedings of the acm SIGPLAN 2004 Haskell Workshop, Haskell'04

作者： Forsberg, Markus Ranta, Aarne Department of Computing Science Chalmers University of Technology University of Gothenburg SE-412 96 Gothenburg Sweden

ISBN: (纸本)1581138504

We will demonstrate BNFC (the BNF Converter) [7, 6], a multi-lingual compiler tool. BNFC takes as its input a grammar written in LBNF (Labelled BNF) notation, and generates a compiler front-end (an abstract syntax, a lexer, and a parser). Furthermore, it generates a case skeleton usable as the starting point of back-end construction, a pretty printer, a test bench, and a L ATEX document usable as language specification. The program components can be generated in Haskell, Java, C and C++ and their standard parser and lexer tools. BNFC itself was written in Haskell. The methodology used for the generated front-end is based on Appel's books on compiler construction [3, 1, 2]. BNFC has been used as a teaching tool in compiler construction courses at Chalmers. It has also been applied to research-related programming language development, and in an industrial application producing a compiler for a telecommunications protocol description language [4]. BNFC is freely available under the GPL license at its web-site and in the testing distribution of Debian Linux.

关键词： Code converters

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Active learning for automatic classification of software behavior

Active learning for automatic classification of software beh...

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acm SIGSOFT International symposium on Software Testing and Analysis, ISSTA 2004

作者： Bowring, James F. Rehg, James M. Harrold, Mary Jean College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 United States

ISBN: (纸本)1581138202

A program's behavior is ultimately the collection of all its executions. This collection is diverse, unpredictable, and generally unbounded. Thus it is especially suited to statistical analysis and machine learning techniques. The primary focus of this paper is on the automatic classification of program behavior using execution data. Prior work on classifiers for software engineering adopts a classical batch-learning approach. In contrast, we explore an active-learning paradigm for behavior classification. In active learning, the classifier is trained incrementally on a series of labeled data elements. Secondly, we explore the thesis that certain features of program behavior are stochastic processes that exhibit the Markov property, and that the resultant Markov models of individual program executions can be automatically clustered into effective predictors of program behavior. We present a technique that models program executions as Markov models, and a clustering method for Markov models that aggregates multiple program executions into effective behavior classifiers. We evaluate an application of active learning to the efficient refinement of our classifiers by conducting three empirical studies that explore a scenario illustrating automated test plan augmentation. Copyright 2004 acm.

关键词： Learning systems

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Implementation and Evaluation of a Scalable Application-Level Checkpoint-Recovery Scheme for MPI Programs 04

Implementation and Evaluation of a Scalable Application-Leve...

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2004 acm/IEEE Conference on Supercomputing, SC 2004

作者： Schulz, Martin Bronevetsky, Greg Fernandes, Rohit Marques, Daniel Pingali, Keshav Stodghill, Paul Center for Applied Scientific Computing Lawrence Livermore National Laboratory LivermoreCA94551 United States Department of Computer Science Cornell University IthacaNY14853 United States

ISBN: (纸本)0769521533

The running times of many computational science applications are much longer than the mean-time-to-failure of current high-performance computing platforms. To run to completion, such applications must tolerate hardware failures. Checkpoint-and-restart (CPR) is the most commonly used scheme for accomplishing this - the state of the computation is saved periodically on stable storage, and when a hardware failure is detected, the computation is restarted from the most recently saved state. Most automatic CPR schemes in the literature can be classified as system-level checkpointing schemes because they take core-dump style snapshots of the computational state when all the processes are blocked at global barriers in the program. Unfortunately, a system that implements this style of checkpointing is tied to a particular platform;in addition, it cannot be used if there are no global barriers in the program. We are exploring an alternative called application-level, non-blocking checkpointing. In our approach, programs are transformed by a pre-processor so that they become self-checkpointing and self-restartable on any platform;there is also no assumption about the existence of global barriers in the code. In this paper, we describe our implementation of application-level, non-blocking checkpointing. We present experimental results on both a Windows cluster and a Compaq Alpha cluster, which show that the overheads introduced by our approach are small. © 2004 IEEE.

关键词： Application programs

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Leveraging single-user applications for multi-user collaboration: The CoWord approach

Leveraging single-user applications for multi-user collabora...

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Computer Supported Cooperative Work - Conference proceedings, CSCW 2004

作者： Xia, Steven Sun, David Sun, Chengzheng Chen, David Shen, Haifeng School of Computing and Information Technology Griffith University Brisbane QLD 4111 Australia School of Computer Engineering Nanyang Technological University Singapore 639798

Single-user interactive computer applications are pervasive in our daily lives and work. Leveraging single-user applications for multi-user collaboration has the potential to significantly increase the availability and improve the usability of collaborative applications. In this paper, we report an innovative transparent adaptation approach for this purpose. The basic idea is to adapt the single-user application programming interface to the data and operational models of the underlying collaboration supporting technique, namely Operational Transformation. Distinctive features of this approach include: (1) Application transparency: it does not require access to the source code of the single-user application;(2) Unconstrained collaboration: it supports concurrent and free interaction and collaboration among multiple users;and (3) Reusable collaborative software components: collaborative software components developed with this approach can be reused in adapting a wide range of single-user applications. This approach has been applied to transparently convert MS Word into a real-time collaborative word processor, called CoWord, which supports multiple users to view and edit any objects in the same Word document at the same time over the Internet. The generality of this approach has been tested by re-applying it to convert MS PowerPoint into CoPowerPoint. Copyright 2004 acm.

关键词： Computer supported cooperative work

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Progressive dimension-independent boolean operations

Progressive dimension-independent boolean operations

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Ninth acm symposium on Solid Modeling and Applications, SM'04

作者： Paoluzzi, A. Pascucci, V. Scorzelli, G. Dip. di Informatica e Automazione Università Roma Tre Via della Vasca Navale 79 00146 Roma Italy Center for Applied Scientific Computing Lawrence Livermore National Laboratory Livermore CA 94551 United States

This paper introduces a new progressive multi-resolution approach for representating and processing polyhedral objects of any dimension. Our representation, a variant of BSP trees [Nay90] combined with the Split scheme introduced in [BP96], allows progressive streaming and rendering of solid models at multiple levels of detail (LOD). Boolean set operations are computed progressively by reading in input a stream of incremental refinements of the operands. Each refinement of the input is mapped immediately to a refinement of the output so that the result is also represented as a stream of progressive refinements. The computation of complex models results in a tree of pipelined processes that make continuous progress concurrently, so that coarse approximations of the final results are obtained nearly instantly, long before the input operands are fully processed. We demonstrate the practical effectiveness of this approach with models constructed with our prototype system. © The Eurographics Association 2004.

关键词： Boolean functions

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Interactive virtual reality on the grid 04

Interactive virtual reality on the grid

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8th IEEE International symposium on Distributed Simulation and Real-Time Applications (DS-RT 2004)

作者： Kranzlmüller, D Rosmanith, H Heinzlreiter, P Polak, M Univ Linz GUP A-4040 Linz Austria

ISBN: (纸本)0769522327

The grid has received a substantial amount of interest (and funding) over the past few years, even though the majority of grid applications are still batch-oriented. For this reason, extensions to grid middle-ware are a basic necessity to advance the idea of the grid into new application domains. The glogin tool and its integration into the Grid Visualization Kernel (GVK) yield both, interactivity and visualization, into the grid. While glogin enables the tunneling of arbitrary interactive traffic in and out of the grid, GVK offers transparent visualization services for grid applications while exploiting the grid's performance for time-consuming visualization tasks. In this paper, the utilization of glogin and GVK is demonstrated for Virtual Reality (VR) environments. Two distinct approaches for VR, using either abstract visualization objects or video streams, are explained, highlighting advantages and disadvantages of each.

关键词： Virtual reality Grid computing Data visualization Kernel Workstations Contracts Tunneling High performance computing Application software Middleware

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G-AQFS: Grid computing exploitation for the management of air quality in presence of complex meteorological circulations

G-AQFS: Grid computing exploitation for the management of ai...

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International Conference on Information Technology - Coding and computing

作者： Aloisio, G Cafaro, M Cesari, R Mangia, C Marra, GP Miglietta, M Mirto, M Rizza, U Schipa, I Tanzarella, A Univ Lecce ISUFI Ctr Adv Computat Technol I-73100 Lecce Italy

ISBN: (纸本)0769521088

Leveraging Grid computing technology, i.e. the virtualization of distributed computing and data resources such as processing, network bandwidth and storage capacity to create a single system image, we present a Grid Air Quality Forecast System (G-AQFS). The Modeling system consists of meteorological and dispersion models coupled in cascade. The computational workflow of the Modeling system is defined by means of DAGs (Direct Acyclic Graph). A simple system is presented to manage and schedule the computational Grid resources. As case study the system has been applied over Salento area, in the Apulia region (South-eastern Italy), to simulate ground level ozone concentration. Model predictions have been compared with field measurements, with reasonable results.

关键词： air quality and atmospheric modeling computational grid grid computing globus toolkit

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