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作者： Cappelli, Claudia Santoro, Flávia Maria Nunes, Vanessa De Barros, Márcio O. Dutra, José Roberto Postgraduate Information Systems Program UNIRIO Av. Pasteur 458 Urca - Rio de Janeiro RJ Brazil COPPE/UFRJ Systems Engineering and Computer Science Program P.O. Box 68511 Rio de Janeiro RJ Brazil

ISBN: (纸本)9789898425065

Business processes modeling projects are increasingly widespread in organizations. Companies have several processes to be identified and modeled. They usually invest much in hiring expert consultants to do such job. However, they still find no guidelines to help them estimate how much a process modeling project will cost or how long this will take. We propose an approach to estimate the effort required to conduct a BPM project and discuss results obtained from over 50 projects in a large Brazilian company.

关键词： Process engineering

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Common Agile Practices in Software Processes

Common Agile Practices in Software Processes

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International Symposium on Empirical Software engineering and Measurement, ESEM

作者： Jose Fortuna Abrantes Guilherme Horta Travassos COPPE/Systems Engineering and Computer Science Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

Objective: to investigate studies about software processes looking for practices which can be used to obtain agility in software processes. Method: A systematic review including seven search engines was executed in Feb/2010. To apply the defined criteria to select papers and extract information regarding working practices bringing agility to software processes. Results: from 6696 retrieved papers, 441 were selected to support the identification of 236 occurrences of 51 distinct practices associated with the concept of agility. Their descriptions were deeply analyzed and consolidated. After discarding those which appeared in the technical literature in a small amount of papers, 17 agile practices were identified. Conclusion: although further studies are necessary to evaluate the efficacy of these 17 agile practices, 12 of them have been more commonly approached in the software projects and could be primarily considered: test driven development, continuous integration, pair programming, planning game, onsite customer, collective code ownership, small releases, metaphor, refactoring, sustainable pace, simple design and coding standards.

关键词： Software Software engineering Context Programming profession Business Encoding

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A massively parallel hardware architecture for ray-tracing

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International Journal of High Performance systems Architecture 2009年第1期2卷 26-34页

作者： Nery, A.S. Nedjah, N. França, F.M.G. Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE P.O. Box 68511 21941-972 Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade do Estado do Rio de Janeiro Rua Sao Francisco Xavier 524 Sala 5145-F Maracana 20.550-900 Rio de Janeiro RJ Brazil Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering State University of Rio de Janeiro Brazil Brazil

Real time performance of non-interactive rendering of three-dimensional scenes is usually unachievable. Ray tracing is one of the methods used for rendering such scenes. The performance achieved by a sequential software-based implementation of ray tracing is far from satisfactory. In contrast, many parallel implementations of ray tracing have been enabling real time performance, as the underlying algorithm can be massively parallelised. Thus, it is expected that a custom parallel design in hardware is likely to achieve the acceptable performance standards. In this paper, we propose a hardware architecture, which we call GridRT, capable of dealing with the main desirable features of ray tracing, such as shadows and reflections effects, imposing low requirements in terms of silicon area while achieving acceptable performance in terms of rendering time. This architecture achieves is efficient yet compact as it explores the massive parallelism offered by the intrinsic structure of the algorithm. The design exploits the usage the spatial data structure of regular grids. Copyright © 2009 Inderscience Enterprises Ltd.

关键词： Ray tracing

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Fuzzy Markov predictor in electric load forecasting

Fuzzy Markov predictor in electric load forecasting

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International Joint Conference on Neural Networks (IJCNN)

作者： M.A. Teixeira G. Zaverucha Systems Engineering and Computer Science Program Federal University of Rio de Janeiro Brazil Systems Engineering and Computer Science Program E28093 Graduate Programs in Engineering (COPPE) Federal University of Rio de Janeiro Brazil

We present the fuzzy Markov predictor (FMP), a hybrid system that is applied to the task of monthly electric load forecasting. The FMP is a modification we introduce in the hidden Markov model in order to enable it to predict numerical values. The FMP can be seen as an extension of the fuzzy Bayes predictor (FBP) that was modified from the naive Bayes classifier. For verifying the efficiency of the FMP's prediction, we compare it with the FBP, one fuzzy system and two traditional forecasting methods, Box-Jenkins and Winters exponential smoothing.

关键词： Load forecasting Fuzzy systems Hidden Markov models Power engineering and energy Smoothing methods Niobium compounds systems engineering and theory computer science Predictive models Electric variables measurement

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A Systematic Review of Cross- vs. Within-Company Cost Estimation Studies 10

A Systematic Review of Cross- vs. Within-Company Cost Estima...

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10th International Conference on Evaluation and Assessment in Software engineering, EASE 2006

作者： Kitchenham, Barbara Mendes, Emilia Travassos, Guilherme H. Department of Computer Science Keele University StaffordshireST5 5GB United Kingdom National ICT Australia Locked Bag 9013 AlexandriaNSW1435 Australia Computer Science Department The University of Auckland Private Bag 92019 Auckland New Zealand UFRJ/COPPE Systems Engineering and Computer Science Program Caixa Postal 68511 RJ Rio de Janeiro21941-972 Brazil

OBJECTIVE – The objective of this paper is to determine under what circumstances individual organisations would be able to rely on cross-company based estimation models. METHOD – We performed a systematic review of studies that compared predictions from cross-company models with predictions from within-company models based on analysis of project data. RESULTS – Ten papers compared cross-company and within-company estimation models, however, only seven of the papers presented independent results. Of those seven, three found that cross-company models were as good as within-company models, four found cross-company models were significantly worse than within-company models. Experimental procedures used by the studies differed making it impossible to undertake formal meta-analysis of the results. The main trend distinguishing study results was that studies with small single company data sets (i.e. © EASE *** rights reserved.

关键词： Cost estimating

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COMPOOTIM: An approach to software processes composition and optimization

COMPOOTIM: An approach to software processes composition and...

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15th Ibero-American Conference on Software engineering, CIbSE 2012

作者： Magdaleno, Andréa Magalhães de Araujo, Renata Mendes Werner, Cláudia Maria Lima COPPE/UFRJ Systems Engineering and Computer Science Department P.O. Box 68511 Rio de Janeiro RJ Zip 21945-970 Brazil UNIRIO Brazil NP2Tec Research and Practice Group in Information Technology UNIRIO Brazil

Software process definition is a complex, time consuming and error prone activity. Such activity can be facilitated by a process reuse strategy. This strategy can be implemented through a context-based process line approach. Based on the data from this approach and following its systematic, this work presents a proposal to software processes composition and optimization (COMPOOTIM). The purpose is to support the project manager's decisions and automate the composition of a project specific process. COMPOOTIM optimizes the suggestion of processes to the context of a particular project. A usage scenario for process selection exemplifies the use of COMPOOTIM.

关键词： Optimization

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Combining attributes to improve the performance of Naive Bayes for Regression

Combining attributes to improve the performance of Naive Bay...

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International Joint Conference on Neural Networks (IJCNN)

作者： Aloisio Carlos de Pina Gerson Zaverucha Department of Systems Engineering and Computer Science COPPE/PESC Federal University of Rio de Janeiro Rio de Janeiro Brazil

Naive Bayes for regression (NBR) uses the naive Bayes methodology to numeric prediction tasks. The main reason for its poor performance is the independence assumption. Although many recent researches try to improve the performance of naive Bayes by relaxing the independence assumption, none of them can be directly applied to the regression framework. The objective of this work is to present a new approach to improve the results of the NBR algorithm, by combining attributes by means of an auxiliary regression algorithm.

关键词： Linear regression Training Kernel Joints Prediction algorithms Accuracy Data models

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Architectural elements recovery and quality evaluation to assist in reference architectures specification

Architectural elements recovery and quality evaluation to as...

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19th International Conference on Software engineering and Knowledge engineering, SEKE 2007

作者： De Vasconcelos, Aline Pires Vieira Werner, Claudia Maria Lima COPPE UFRJ Systems Engineering and Computer Science Program P.O. Box 68511 Rio de Janeiro RJ Brazil CEFET Campos Federal Center for Technological Education of Campos Dr. Siqueira 273 Campos dos Goytacazes RJ Brazil

ISBN: (纸本)9781627486613

Reference architectures are the basis for application instantiation in both Domain engineering and Product Line contexts. They are created based on domain requirements, commonalities, and variability. Considering that one of the essential sources of information in this context is the existing systems available in the domain, reverse engineering becomes a key activity to assist in reference architectures specification. Although many approaches consider reengineering existing systems to help in reusable components extraction and variability identification, they do not propose an approach, with well-defined activities and criteria, to support reference architectures specification from existing systems. In this context, this paper describes an approach to help in this task covering three macro-Activities, namely: reverse engineering focusing on architectural elements recovery;recovered architecture quality evaluation;and domain commonalities and variability identification. These activities are guided by general criteria, which can be reused across domains, and are supported by a tool set integrated to a reuse based software development environment, i.e. the Odyssey environment. The results of experimental studies conducted to evaluate the first two macro-Activities are described in this paper. Copyright © (2007) by Knowledge systems Institute (KSI).

关键词： computer software reusability

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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 ...

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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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A variable priorities MAC protocol for Broadband Wireless Access with improved channel utilization among stations

A variable priorities MAC protocol for Broadband Wireless Ac...

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International Symposium on Telecommunications

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

The Broadband Wireless Access (BWA) technology has been proposed to support different traffic classes with distinct quality of service (QoS) requirements in broadband metropolitan area networks. Therefore, as part of its specifications, such a system must properly address the combined requirements of wireless communications and multimedia applications. We propose in this paper an extension to the MAC protocol presented in [1, 2], by assigning variable priorities to the network stations sharing access to the communication channel. An analytical model to evaluate the performance of the proposed protocol is also developed and results obtained for the messages waiting times at different stations are presented. In addition, simulation data are used to compare the results obtained from the analytical model presented previously. It is concluded that the proposed variable priority MAC protocol is able to improve channel utilization and provide throughput and queueing delay fairness among the stations in the network.

关键词： Media Access Protocol Wireless application protocol Access protocols Analytical models Quality of service Telecommunication traffic Traffic control Metropolitan area networks Wireless communication Multimedia communication

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