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检索条件"机构=COPPE - Systems Engineering and Computer Science"

共 129 条记录，以下是31-40 订阅

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Efficient categorization of memory sharing patterns in software DSM systems 15

Efficient categorization of memory sharing patterns in softw...

引用

15th International Parallel and Distributed Processing Symposium, IPDPS 2001

作者： De Castro, M.C.S. De Amorim, C.L. Computer Science Department Federal University of Juiz de Fora Minas Gerais Brazil COPPE - Systems Engineering Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)0769509908

This work introduces a new technique that enables SDSMs to categorize dynamically and accurately memory sharing patterns in both classes of regular and irregular applications. The categorization is carried out automatically at run-time on a per-page basis, requiring no user or compiler assistance. We evaluate the potential benefits of our technique using execution-driven simulations of 8 applications running on TrendMarks on a network of 8 workstations. Surprisingly, we found that producer-consumer(s) and migratory are the dominant patterns even in irregular applications. Preliminary results suggest that the categorization technique we propose is a promising option to further improve the performance of current adaptive SDSM systems. © 2001 IEEE.

关键词： adaptive software DSM systems latency-hiding techniques memory sharing patterns

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Odyssey-VCS: A flexible version control system for UML model elements 05

Odyssey-VCS: A flexible version control system for UML model...

引用

12th International Workshop on Software Configuration Management, SCM 2005

作者： Oliveira, Hamilton Murta, Leonardo Werner, Cláudia COPPE/UFRJ - Systems Engineering and Computer Science Program Federal University of Rio de Janeiro P.O. Box 68511 21945-970 Rio de Janeiro Brazil

ISBN: (纸本)1595933107

Many current version control systems use a simple data model that is barely sufficient to manipulate source-code. This simple data model is not sufficient to provide versioning capabilities for software modeling environments, which are strongly focused on analysis and architectural design artifacts. In this work, we introduce a flexible version control system for UML model elements. This version control system, named Odyssey-VCS, deals with the complex data model used by UML-based CASE tools. Moreover, it allows the configuration of both the unit of versioning and unit of comparison for each specific project, respecting the different needs of the diverse development scenarios. Copyright © 2005 ACM.

关键词： Information management

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Porantim: An approach to support the combination and selection of model-based testing techniques

Porantim: An approach to support the combination and selecti...

引用

2009 ICSE Workshop on Automation of Software Test, AST 2009

作者： Neto, Arilo Claudio Dias Travassos, Guilherme Horta Federal University of Rio de Janeiro Systems Engineering and Computer Science Program COPPE/UFRJ P.O. Box 68511 21941-972 Rio de Janeiro RJ Brazil

ISBN: (纸本)9781424437436

The technical literature regarding Model-based Testing (MBT) has several techniques with different characteristics and goals available to be applied in software projects. Besides the lack of information regarding these techniques, they could be applied together in a software project aiming at improving the testing coverage. However, this decision needs to be carefully analyzed to avoid loss of resources in a software project. Based on this scenario, this paper proposes an approach with the purpose of supporting the unique or combined selection of MBT techniques for a given software project considering two aspects: the adequacy level between MBT techniques and the software project characteristics and impact of more than one MBT technique in some testing process variables. At the end, preliminary results of an experimental evaluation are presented.

关键词： Model checking

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Using ontology and data provenance to improve software processes

Using ontology and data provenance to improve software proce...

引用

Brazilian Seminar on Ontologies, ONTOBRAS 2015

作者： Dalpra, Humberto L. O. Costa, Gabriella C. B. Sirqueira, Tássio F. M. Braga, Regina Werner, Cláudia M. L. Campos, Fernanda David, José Maria N. UFJF - Federal University of Juiz de Fora Department of Computer Science Juiz de Fora - MG Brazil UFRJ - Federal University of Rio de Janeiro COPPE Systems Engineering and Computer Science Department Rio de Janeiro - RJ Brazil

Provenance refers to the origin of a particular object. In computational terms, provenance is a historical record of the derivation of data that can help to understand the current record. In this context, this work presents a proposal for software processes improvement using a provenance data model and an ontology. This improvement can be obtained by process data execution analysis with an approach called PROV-Process, which uses a layer for storing process provenance and an ontology based on PROV-O.

关键词： Ontology

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An Environment to Support Large Scale Experimentation in Software engineering

An Environment to Support Large Scale Experimentation in Sof...

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IEEE International Conference on engineering of Complex computer systems

作者： Guilherme H. Travassos Paulo Sérgio Medeiros dos Santos Paula Gomes Mian Paula Gomes Mian Neto Jorge Biolchini Systems Engineering and Computer Science Program COPPE/UFRJ Brazil COPPE/UFRJ Rio de Janeiro

Experimental studies have been used as a mechanism to acquire knowledge through a scientific approach based on measurement of phenomena in different areas. However it is hard to run such studies when they require models (simulation), produce amount of information, and explore science in scale. In this case, a computerized infrastructure is necessary and constitutes a complex system to be built. In this paper we discuss an experimentation environment that has being built to support large scale experimentation and scientific knowledge management in software engineering.

关键词： Large-scale systems Software engineering Knowledge engineering Knowledge management Distributed computing engineering management Software systems Software quality Area measurement Software measurement

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Monitoring collaboration in software processes using social networks

Monitoring collaboration in software processes using social ...

引用

20th International Conference on Collaboration and Technology, CRIWG 2014

作者： Costa, Gabriella C. B. Santana, Francisco Magdaleno, Andréa M. Werner, Cláudia M. L. UFRJ - Federal University of Rio de Janeiro COPPE - Systems Engineering and Computer Science Department P.O. Box 68511 21945-970 - Rio de Janeiro - RJ Brazil

ISBN: (纸本)9783319101651

Collaboration monitoring in software process is important to check if the collaboration is indeed happening as planned, but there are few approaches that define how to measure and monitor collaboration. By assessing collaboration during an ongoing process execution, project managers can take corrective actions that might improve the process execution and, consequently, reflect on quality gains of the final product. This research work proposes to evaluate the level of coordination achieved by a running software process through social network analysis metrics. © 2014 Springer International Publishing.

关键词： Social sciences computing

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Disk write caching with an optical network 6

Disk write caching with an optical network

引用

6th International Conference on Parallel Interconnects, PI 1999

作者： Carrera, Enrique V. Bianchini, Ricardo COPPE Systems Engineering Federal University of Rio de Janeiro Rio de Janeiro21945-970 Brazil Department of Computer Science University of Rochester RochesterNY14627 United States

ISBN: (纸本)076950440X

In this paper we propose a simple extension to the optical network of a scalable multiprocessor that optimizes page swap-outs significantly. More specifically, we propose to extend the network with an optical ring that not only transfers swapped-out pages between the local memories and the disks of the multiprocessor but also acts as a system-wide write cache for these pages. This extended optical network has several performance benefits: it provides a staging area where swapped-out pages can reside until the disk is free;it increases the possibility of combining several writes to disk;and it acts as a victim cache for pages that are swapped out and subsequently accessed by the same or a different processor. In order to evaluate the extent to which these benefits affect performance, we use detailed execution-driven simulations of several out-of-core parallel applications running on an 8-node scalable multiprocessor. Our results demonstrate that our optical ring provides consistent performance improvements, coming mostly from faster page swap-outs and victim caching. Based on these results and on our parameter space study, our main conclusion is that our optical ring is highly efficient under several architectural assumptions and for most out-of-core parallel applications. © 1999 IEEE.

关键词： Fiber optic networks

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Supporting the selection of model-based testing approaches for software projects

Supporting the selection of model-based testing approaches f...

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3rd International Workshop on Automation of Software Test, AST 2008, held in Conjunction with the 30th International Conference on Software engineering, ICSE 2008

作者： Dias Neto, Arilo Claudio Travassos, Guilherme Horta Federal University of Rio de Janeiro Systems Engineering and Computer Science Program - COPPE/UFRJ P.O. Box 68511 21941-972 Rio de Janeiro RJ Brazil

ISBN: (纸本)9781605580302

Software technologies, such as model-based testing approaches, have specific characteristics and limitations that can affect their use in software projects. To make available knowledge regarding such technologies is important to support the decision regarding their use in software projects. In particular, a choice of model-based testing approach can influence testing success or failure. Therefore, this paper aims at describing knowledge acquired from a systematic review regarding model-based testing approaches and proposing an infrastructure towards supporting their selection for software projects. Copyright 2008 ACM.

关键词： Software testing

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Maximum-Entropy Sampling 1

引用

丛书名： Springer Series in Operations Research and Financial engineering

1000年

作者： Marcia Fampa Jon Lee

ISBN: (数字)9783031130786

ISBN: (纸本)9783031130779;9783031130809

This monograph presents a comprehensive treatment of the maximum-entropy sampling problem (MESP), which is a fascinating topic at the intersection of mathematical optimization and data science. The text situates MESP in information theory, as the algorithmic problem of calculating a sub-vector of pre-specificed size from a multivariate Gaussian random vector, so as to maximize Shannon's differential entropy. The text collects and expands on state-of-the-art algorithms for MESP, and addresses its application in the field of environmental monitoring. While MESP is a central optimization problem in the theory of statistical designs (particularly in the area of spatial monitoring), this book largely focuses on the unique challenges of its algorithmic side. From the perspective of mathematical-optimization methodology, MESP is rather unique (a 0/1 nonlinear program having a nonseparable objective function), and the algorithmic techniques employed are highly non-standard. In particular, successful techniques come from several disparate areas within the field of mathematical optimization; for example: convex optimization and duality, semidefinite programming, Lagrangian relaxation, dynamic programming, approximation algorithms, 0/1 optimization (e.g., branch-and-bound), extended formulation, and many aspects of matrix theory. The book is mainly aimed at graduate students and researchers in mathematical optimization and data analytics.

关键词： Optimization Operations Research, Management science

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The impact of cache coherence protocols on parallel logic programming systems 1

引用

1st International Conference on Computational Logic, CL 2000

作者： De Castro Dutra, Inês Costa, Vítor Santos Bianchini, Ricardo COPPE Systems Engineering Federal University of Rio de Janeiro Rio de Janeiro 21945-970 Brazil Department of Computer Science Rutgers University Piscataway NJ 08854-8019 United States

ISBN: (数字)9783540449577

ISBN: (纸本)3540677976

In this paper we use execution-driven simulation of a scalable multiprocessor to evaluate the performance of the Andorra-I parallel logic programming system under invalidate and update-based protocols. We use two versions of Andorra-I. One of them was originally designed for bus-based multiprocessors, while the other is optimised for scalable architectures. We study a well-known invalidate protocol and two different update-based protocols. Our results show that for our sample logic programs the update-based protocols outperform their invalidate-based counterpart for the original version of Andorra-I. In contrast, the optimised version of Andorra-I benefits the most from the invalidate-based protocol, but a hybrid update-based protocol performs as well as the invalidate protocol in most cases. We conclude that parallel logic programming systems can consistently benefit from hybrid update-based protocols. © Springer-Verlag Berlin Heidelberg 2000.

关键词： computer circuits

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