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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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Analysis and evaluation of a new MAC protocol for broadband wireless access

Analysis and evaluation of a new MAC protocol for broadband ...

引用

International Conference on Wireless Networks, Communications and Mobile Computing

作者： L.F.M. de Moraes P.D. Maciel Systems Engineering and Computer Science Program-COPPE/UFRJ High-Speed Networks Laboratory-RAVEL Rio de Janeiro Brazil

Broadband wireless access (BWA) systems offer a solution for broadband access and high data rate transmission of multimedia services with distinct quality-of-service (QoS) requirements through a wireless medium, IEEE 802.16 standard specifies the PHY and MAC layers for BWA systems. However, in spite of including the possibility for QoS support, the standard does not define how to schedule different types of traffic. This article propose a new MAC protocol for BWA systems that incorporates a traffic scheduling mechanism based on messages and/or stations priorities. An analytical model to evaluate the performance of the proposed protocol is also developed and results obtained for the messages waiting times of different traffic classes are presented.

关键词： Media Access Protocol Wireless application protocol Access protocols Traffic control Physical layer Proposals Quality of service Analytical models Scheduling Access control

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Fuzzy multi-hidden Markov predictor in electric load forecasting

Fuzzy multi-hidden Markov predictor in electric load forecas...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： M.A. Teixeira G. Zaverucha Systems Engineering and Computer Science-COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Electric Power Research Center CEPEL Rio de Janeiro Brazil

We present two new systems that approximate probability density functions (pdFs) in order to predict continuous values of time series: the fuzzy multi-hidden Markov predictor (FMHMP) and the multi-hidden Markov model for regression (MHMMR). They use fuzzification or discretization of continuous data and dynamic Bayesian networks (DBN's) to estimate pdfs and then make continuous predictions. A DBN is a Bayesian network that represents a temporal probability model. The employed DBN is a generalization of the hidden Markov model that allows multiple hidden variables. The new systems are applied to the task of monthly electric load single-step forecasting and successfully compared with other fuzzy and discrete probabilistic predictors, two Kalman filter models, and two traditional forecasting methods, Box-Jenkins and Winters exponential smoothing. The employed time series present a sudden significant changing behavior at their last years, as it occurs in an energy rationing.

关键词： Load forecasting Hidden Markov models Predictive models Bayesian methods Fuzzy systems Probability density function Histograms Intelligent networks Smoothing methods Statistics

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Scientific models management in computational grids

Scientific models management in computational grids

引用

17th International Conference Scientific and Statistical Database Management, SSDBM 2005

作者： De Brito, Halisson Matos Strauch, Julia De Souza, Jano Moreira Osthoff, Carla COPPE/UFRJ Systems Engineering and Computer Science Program Federal University of Rio de Janeiro PO Box 68511 ZIP Code: 21945-970 Rio de Janeiro RJ Brazil ENCE /IBGE National School of Statistical Sciences 106 S. 401 ZIP Code: 20231-050 R. André Cavalcanti Rio de Janeiro RJ Brazil LNCC National Laboratory for Scientific Computing Av. Getulio 333 Quitandinha Vargas Petrópolis RJ Brazil IM/UFRJ Institute of Mathematics Federal University of Rio de Janeiro PO Box 68511 ZIP Code: 21945-970 Rio de Janeiro RJ Brazil

This paper presents MODENA, an architecture for scientific models management using Computational Grid platform. This architecture is comprised of two systems: ModManager and ModRunner. ModManager deals with knowledge management about scientific models, acting as a scientific models library allowing for cataloguing, searching, reutilization and generation of new models. To achieve this, a metamodel is proposed to classify models, in order to support the organization, searching and retrieving of models. ModRunner manages the execution of models in a Grid environment allowing for model composition to generate a scientific Grid Workflow to be executed by distributed services offered by Grid Services. An initial prototype of ModManager is presented.

关键词： Knowledge management

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A computational framework for supporting software inspections 04

A computational framework for supporting software inspection...

引用

IEEE International Conference on Automated Software engineering (ASE)

作者： M. Kalinowski G.H. Travassos Systems Engineering and Computer Science COPPE/UFRJ Brazil

ISBN: (纸本)9780769521312

Software inspections improve software quality by the analysis of software artifacts, detecting their defects for removal before these artifacts are delivered to the following software life cycle activities. Some knowledge regarding software inspections have been acquired by empirical studies. However, we found no indication that computational support for the whole software inspection process using appropriately such knowledge is available. This paper describes a computational framework whose requirements set was derived from knowledge acquired by empirical studies to support software inspections. To evaluate the feasibility of such framework, two studies have been accomplished: one case study, which has shown the feasibility of using the framework to support inspections, and an experimental study that evaluated the supported software inspection planning activity. Preliminary results of this experimental study suggested that unexperienced subjects are able to plan inspections with higher defect detection effectiveness, and in less time, when using this computational framework.

关键词： Inspection Software quality Proposals systems engineering and theory computer science Costs Decision making Software performance Processor scheduling Guidelines

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Tool-supported unobtrusive evaluation of software engineering process conformance

Tool-supported unobtrusive evaluation of software engineerin...

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International Symposium on Empirical Software engineering (ISESE)

作者： L.F.S. Silva G.H. Travassos Systems Engineering and Computer Science COPPE Universidade Federal do Rio de Janeiro Brazil

Software engineers face the dilemma of verifying process conformance and having the Hawthorne effect distorting the results or not doing it and as a consequence not being able to know if the proposed process is actually carried out. We addressed this issue by classifying and proposing the use of some approaches based on unobtrusive observation. These approaches include cognitive labs, remote monitoring and metrics collection. In addition, a tool supporting the application of perspective based reading (PER) for requirements inspection has been used and is also presented to exemplify metrics collection. Among other features, PBR Tool unobtrusively collects metrics in order to monitor if the reading technique is faithfully applied. Two studies evaluating the feasibility of such a tool are also reported.

关键词： Software engineering Bioreactors Productivity Remote monitoring systems engineering and theory computer science Inspection Fault detection Noise generators Signal to noise ratio

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Improving the performance of the RISE algorithm

引用

8th European Conference on Principles and Practice of Knowledge Discovery in Databases, PKDD 2004

作者： de Pina, Aloísio Carlos Zaverucha, Gerson Universidade Federal do Rio de Janeiro COPPE/PESC Department of Systems Engineering and Computer Science C.P. 68511 Rio de JaneiroRJCEP. 21945-970 Brazil

ISBN: (纸本)3540231080

RISE is a well-known multi-strategy learning algorithm that combines rule induction and instance-based learning. It achieves higher accuracy than some state-of-the-art learning algorithms, but for large data sets it has a very high average running time. This work presents the analysis and experimental evaluation of SUNRISE, a new multi-strategy learning algorithm based on RISE, developed to be faster than RISE with similar accuracy. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Learning algorithms

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Fuzzy hidden Markov predictor in electric load forecasting

Fuzzy hidden Markov predictor in electric load forecasting

引用

International Joint Conference on Neural Networks (IJCNN)

作者： M.A. Teixeira G. Zaverucha Systems Engineering and Computer Science-COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil

We present a new hybrid system that merges fuzzy logic with dynamic Bayesian networks (DBN's): the fuzzy hidden Markov predictor. It is a modification of the hidden Markov model, a particular case of DBN's, in order to enable it to predict continuous values of a time series. A DBN is a Bayesian network that represents a temporal probability model. This hybrid system is applied to the task of monthly electric load single-step forecasting and successfully compared with three regression-by-discretization systems, two fuzzy hybrid systems, two Kalman filter models, and Box-Jenkins and Winters exponential smoothing. The employed time series present a sudden significant changing behavior at their last years, as it occurs in an energy rationing.

关键词： Hidden Markov models Load forecasting Bayesian methods Fuzzy systems Predictive models Random variables Fuzzy logic Smoothing methods Machine learning Pattern recognition

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WebComposer: a tool for the composition and execution of Web service-based workflows

WebComposer: a tool for the composition and execution of Web...

引用

Proceedings of the Latin American Web Congress (LA-Web)

作者： L.A.G. da Costa P.F. Pires M. Mattoso COPPE-Systems Engineering and Computer Science Program Federal University of Rio de Janeiro Rio de Janeiro Brazil DCC-IM/NCE Federal University of Rio de Janeiro Rio de Janeiro Brazil

We present the WebComposer tool for the automatic composition and execution of Web service-based workflows. We use ontologies to describe and browse workflows. We associate messages and operations with workflow domain concepts using WSDL extensibility. The automatic workflow implementation through WebComposer enables the full separation of the workflow logic and the implementation technology. WebComposer provides the execution of ad-hoc programs by users and the automatic maintenance of these programs, as the available Web services are altered.

关键词： Web services Ontologies Software agents Automatic logic units Semantic Web systems engineering and theory computer science Web sites Information resources Application software

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Automatic composition of Web services with contingency plans

Automatic composition of Web services with contingency plans

引用

IEEE International Conference on Web Services (ICWS)

The semantic Web technology and the Web services description language extensibility may be combined to describe services in an unambiguous and machine interpretable way, automating Web services discovery, selection and invocation. In this paper, we present an algorithm and a prototype for the automatic composition of Web services that implement workflows described in a high level language. Our approach has many advantages comparing to the manual creation of a simple program composition, such as smaller implementation time and cost, reliability with the generation of contingency plans, greater capacity to evolve with the dynamic service discovery, and faster execution time with the use of heuristics. We use the OWLS ontology to semantically describe Web services metadata and indexes to help selecting them. The proposed algorithm considers that equivalent services may have different interfaces and also respects preferences of the users.

关键词： Web services Semantic Web Ontologies Programming profession Prototypes Robustness systems engineering and theory computer science High level languages Costs

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