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

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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...

引用

2006 International Telecommunications Symposium, ITS

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

ISBN: (纸本)8589748049

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. © 2006 SBrT.

关键词： Analytical models

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Introducing software process tailoring to BPMN: BPMNt

Introducing software process tailoring to BPMN: BPMNt

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2012 International Conference on Software and System Process, ICSSP 2012

作者： Pillat, Raquel M. Oliveira, Toacy C. Fonseca, Fabio L. Systems Engineering and Computer Science Program - PESC / COPPE Federal University of Rio de Janeiro - UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781467323529

BPMN 2.0 is a widely used notation to model business process that has associated tools and techniques to facilitate process management, execution and monitoring. As a result using BPMN to model Software Development Process (SDP) can leverage on the BPMN's infrastructure to improve SDP quality. Nevertheless, when using BPMN to model Software Processes one can observe the lack of an important feature: means to represent process tailoring. This article introduces the BPMNt, a conservative extension to BPMN that aims at aggregating a tailoring representation mechanism as the one found at SPEM 2.0. BPMNt uses the extensibility classes already present in the BPMN meta-model. Our work also presents an example to illustrate the approach. © 2012 IEEE.

关键词： Software design

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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

2005 International Conference on Wireless Networks, Communications and Mobile Computing

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

ISBN: (纸本)0780393058

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. © 2005 IEEE.

关键词： Network protocols

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Formalizing the situation of a business process activity

Formalizing the situation of a business process activity

引用

2012 IEEE 16th International Conference on computer Supported Cooperative Work in Design, CSCWD 2012

作者： Mattos, Talita Da Cunha Santoro, Flávia Maria Revoredo, Kate Nunes, Vanessa Tavares Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil COPPE/PESC - Systems Engineering and Computer Science Program UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781467312127

Business processes are dynamic and constantly evolving. Contextual elements that had not yet been identified and represented can arise and influence the execution of each process instance in diverse manners. In this scenario, the identification of these elements is considered of great importance. This paper proposes a formalism for context associated with business processes that intends to identify the situation of an activity in order to subsidize decisions to be taken within the execution of a process. © 2012 IEEE.

关键词： Business Process Context

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Modeling resource sharing dynamics of VoIP users over a WLAN using a game-theoretic approach

Modeling resource sharing dynamics of VoIP users over a WLAN...

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INFOCOM 2008: 27th IEEE Communications Society Conference on computer Communications

作者： Watanabe, Edson H. Menasché, Daniel S. De Souza E Silva, Edmundo Leão, Rosa M. M. COPPE Systems Engineering and Computer Science Department Federal University of Rio de Janeiro 21941-590 - Rio de Janeiro RJ Brazil

ISBN: (纸本)9781424420261

We consider a scenario in which users share an access point and are mainly interested in VoIP applications. Each user is allowed to adapt to varying network conditions by choosing the transmission rate at which VoIP traffic is received. We denote this adaptation process by end-user congestion control, our object of study. The two questions that we ask are: (1) what are the performance consequences of letting the users to freely choose their rates? and (2) how to explain the adaptation process of the users? We set a controlled lab experiment having students as subject to answer the first question, and we extend an evolutionary game-theoretic model to address the second. Our partial answers are the following: (1) free users with local information can reach an equilibrium which is close to optimal from the system perspective. However, the equilibrium can be unfair;(2) the adaptation of the users can be explained using a game theoretic model. We propose a methodology to parameterize the latter, which involves active network measurements, simulations and an artificial neural network to estimate the QoS perceived by the users in each of the states of the model. © 2008 IEEE.

关键词： Neural networks

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A boundary extraction method based on Dual-T-Snakes and dynamic programming

A boundary extraction method based on Dual-T-Snakes and dyna...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： G.A. Giraldi E. Strauss A.A. Oliveira COPPE Systems Engineering and Computer Science Brazil

The original proposal of active contour models, also called snakes, for image segmentation, suffers from a strong sensitivity to its initial position and can not deal with topological changes. The sensitivity to initialization can be addressed by dynamic programming (DP) techniques which have the advantage of guaranteeing the global minimum and of being more stable numerically than the variational approaches. Their disadvantages are the storage requirements and computational complexity. In this paper we address these limitations of DP by reducing the region of interest (search space) through the use of the Dual-T-Snake approach. The solution of this method consists of two curves enclosing each object boundary which allows the definition of a more efficient search space for a DP technique. The resulting method (Dual-T-Snake plus DP) inherits the capability of changing the topology and avoiding local minima from the Dual-T-Snake and the global optimal properties of the dynamic programming. It can be also extended for 3D.

关键词： Dynamic programming Image segmentation Electrical capacitance tomography computer graphics Laboratories systems engineering and theory computer science Postal services Proposals Active contours

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Exploring parallelism in volume ray casting: Understanding the programming issues of multithreaded accelerators

Exploring parallelism in volume ray casting: Understanding t...

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2012 International Workshop on Programming Models and Applications for Multicores and Manycores, PMAM 2012

作者： Cox, Guilherme Silva, Cleomar Cupertino, Leandro Bentes, Cristiana Farias, Ricardo Department of Computer Science Rutgers University United States Department of Electrical Engineering Pontifical Catholic University of Rio de Janeiro Brazil Department of Systems Engineering State University of Rio de Janeiro Brazil COPPE/Systems Engineering and Computer Science Federal University of Rio de Janeiro Brazil

ISBN: (纸本)9781450312110

Direct volume rendering of irregular 3D datasets demands high computational power and memory bandwidth. Recent research in optimizing volume rendering algorithms are exploring the high processing power offered by a new trend in hardware design: multithreaded accelerator devices. Accelerators like the Graphics Processing Units (GPU) and the Cell Broadband Engine processor (Cell BE) are used as integrated coprocessors, and the off-loading of the application from the CPU to the accelerator offers promising speedups. The difficulty in using these devices, however, is how to program them efficiently, since their architectural features may be completely distinct. In this paper, we present some new architectural-aware algorithms for irregular grid rendering based on the ray casting method, designed for the Cell BE and the GPU. We investigate the ray traversal inside each accelerator in terms of data access, load balancing, and code divergence, and find new opportunities for performance optimizations based on the ray casting specific needs. Our results show that squeezing these architectures for performance reveals their limitations and can significantly improve the ray casting efficiency. © 2012 ACM.

关键词： Parallel architectures

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Understanding the performance of DSM applications 1st

引用

1st Workshop on Communication and Architectural Support for Network-based Parallel Computing, CANPC 1997

作者： Meira, Wagner Leblanc, Thomas J. Hardavellas, Nikolaos Amorim, Clgudio Department of Computer Science University of Rochester RochesterNY14627 United States COPPE Systems Engineering UFRJ Rio de Janeiro21945-970 Brazil

ISBN: (纸本)3540625739

Carnival is a performance measurement and analysis tool that assists users in understanding the performance of DSM applications and protocols. Using traces of program executions, Carnival presents performance data as a hierarchy of execution profiles. During analysis, Carnival automates the inference process that relates performance phenomena to specific causes in the source code or DSM protocol using techniques that focus on the two most important sources of overhead in DSM systems: waiting time analysis identifies the causes of synchronization overhead, and produces an explanation for each source of waiting time in the program;communication analysis identifies the sequence of requests that result in invalidations, and produces an explanation for each source of communication. We describe these techniques and their implementation in TreadMarks, and show how to use waiting time analysis and communication analysis to improve the running time of two programs froIn the SPLASH application snite when executed on DEC Alphas connected by a DEC Memory Channel network. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Application programs

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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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Performance evaluation of or-parallel logic programming systems on distributed shared-memory architectures

Performance evaluation of or-parallel logic programming syst...

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5th International Conference on Parallel Processing, Euro-Par 1999

作者： Calegario, Vanusa Menditi De Castro Dutra, Inês Empresa Municipal de Informática S/A Rio de Janeiro Brazil COPPE - Systems Engineering and Computer Science Federal University of Rio de Janeiro Brazil

ISBN: (纸本)3540664432

In this work we investigate how Distributed Shared Memory (DSM) architectures affect performance of or-parallel logic programming systems and how this performance approaches that of conventional C systems. Our work concentrates on basic performance, scalability, and programmability. We use execution-driven simulation of a hardware DSM (DASH) to investigate the access patterns and caching behaviour exhibited by parallel C programs and by Aurora, a parallel logic programming system capable of exploiting implicit parallelism in Prolog programs. Aurora was originally written to run on bus-based shared-memory platforms. © Springer-Verlag Berlin Heidelberg 1999.

关键词： C (programming language)

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