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AUTO WIS ARD: Unsupervised modes for the WISARD

引用

6th International Work-Conference on Artificial and Natural Neural Networks, IWANN 2001

作者： Wickert, Iuri Fraņca, Felipe M. G. Computer Systems Engineering Program - COPPE UFRJ Caixa Postal 68511 21945-970 Rio de Janeiro RJ Brazil

ISBN: (纸本)3540422358

This work in traducest wo new unsupervised learning algorithms based on the WISARD weightless neural classifier model. The first one, the standard AUTOWISARD model, is able to perform fast one-shot, learning of unsorted sets of input patterns. The second oik? is a recursive version of AUTOWISARD which not only keeps the good features of the basic model, agility, plasticit v and stability', but also produces hierarc hically structured tree-lik? classifications. Although the standard A UT(WISARD model exhibits good classification skills when exposed to symbolic patterns (by producing only few classes containing patterns of different meanings), its recursive version produces even less confusing classes. The stability of both learning algorithms is also demonstrated. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Learning algorithms

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Complexity control of neural models for load forecasting

Complexity control of neural models for load forecasting

引用

13th International Conference on Intelligent systems Application to Power systems, ISAP'05

作者： Ferreira, Vitor Hugo Da Silva, Alexandre P. Alves IEEE COPPE/UFRJ Electrical Engineering Program Power Systems Lab. Rio de Janeiro RJ 21945-972 Brazil

ISBN: (纸本)1599750287

The knowledge of loads' future behavior is very important for decision making in power system operation. During the last years, many load models have been proposed, and the neural ones have presented the best results. One of the disadvantages of the neural models for load forecasting is the possibility of excessive adjustment of the training data, named overfitting, which degrades the generalization capacity of the estimated models. This problem can be tackled by using regularization techniques. This paper shows the application of some of these techniques to short term load forecasting. © 2005 ISAP.

关键词： Electric loads

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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

引用

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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SpMT WaveCache: Exploiting thread-level parallelism in WaveScalar

SpMT WaveCache: Exploiting thread-level parallelism in WaveS...

引用

2009 WRI World Congress on Computer Science and Information engineering, CSIE 2009

作者： Pei, Songwen Wu, Baifeng Du, Min Chen, Gang Marzulo, Leandro A. J. Franca, Felipe M. G. School of Computer Science Fudan University 200433 Shanghai China Systems Engineering and Computer Science Program COPPE Rio de Janeiro Brazil

ISBN: (纸本)9780769535074

Speculative Multithreading (SpMT) increases the performance by means of executing multiple threads speculatively to exploit thread-level parallelism. By combining software and hardware approaches, we have improved the capabilities of previous WaveScalar ISA on the basis of Transactional Memory system for the WaveCache Architecture. Threads are extracted at the course of static compiling, and speculatively executed as a thread-level transaction that is supported by extra hardware components, such as Thread-Context-Table (TCT) and Thread-Memory-History (TMH). We have evaluated the SpMT WaveCache with 6 real benchmarks from SPEC, Mediabench and Mibench. On the whole, the SpMT WaveCache outperforms superscalar architecture ranging from 2X to 3X, and great performance gains are achieved over original WaveCache and Transactional WaveCache as well. © 2008 IEEE.

关键词： Memory architecture

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Personal Autonomic Desktop Manager with a circulatory computing approach

Personal Autonomic Desktop Manager with a circulatory comput...

引用

5th IEEE International Workshop on engineering of Autonomic and Autonomous systems

作者： Kopiler, Alberto Arkader Dutra, Ines de Castro Franca, Felipe M. G. Systems Automation Department CEPEL Electric Power Research Center Computer Science Department FCUP Porto University Systems Engineering and Computer Science Program COPPE/UFRJ Federal University of Rio de Janeiro

ISBN: (纸本)9780769531403

In this paper we present the architecture for the Personal Autonomic Desktop Manager, a self managing application designed to act on behalf of the user in several aspects: protection, healing, optimization and configuration. The overall goal of this research is to improve the correlation of the autonomic self* properties and doing so also enhance the overall self-management capacity of the desktop (autonomicity). We introduce the Circulatory Computing (CC) model, a self-managing system initiative based on the biological metaphor of the cardiovascular system, and use its concepts in the design and implementation of the architecture.

关键词： Cardiovascular system

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NARX structures for non-invasive temperature estimation in non-homogeneous media

NARX structures for non-invasive temperature estimation in n...

引用

2007 IEEE International Symposium on Intelligent Signal Processing, WISP

作者： Teixeira, C.A. Pereira, W.C.A. Ruano, A.E. Graça Ruano, M. Centre for Intelligent Systems Faculty of Sciences and Technology University of Algarve PRT Portugal Biomedical Engineering Program-COPPE Federal University of Rio de Janeiro Brazil

ISBN: (纸本)142440830X

The safe and effective application of thermal therapies are limited by the existence of precise non-invasive temperature estimators. Such estimators would enable a correct power deposition on the region of interest by means of a correct instrumentation control. In multi-layered media, the temperature should be estimated at each layer and especially at the interfaces, where significant temperature changes should occur during therapy. In this work, a non-linear autoregressive structure with exogenous inputs (NARX) was applied to non-invasively estimate temperature in a multi-layered (non-homogeneous) medium, while submitted to physiotherapeutic ultrasound. The NARX structure is composed, by a static feed-forward radial basis functions neural network (RBFNN), with external dynamics induced by its inputs. The NARX structure parameters were optimized by means of a multi-objective genetic algorithm. The best attained models reached a maximum absolute error inferior to 0.5C (proposed threshold in hyperthermia/diathermia) at both the interface and inner layer points, at four radiation intensities. These models present also a small computational complexity as desired for real-time applications. To the best of ours knowledge this is the first non-invasive estimation approach in multi-layered media using ultrasound for both heating and estimation. ©2007 IEEE.

关键词： Ultrasonics

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Dynamic process adaptation: A context-aware approach

Dynamic process adaptation: A context-aware approach

引用

International Conference on Computer Supported Cooperative Work in Design

作者： Nunes, Vanessa Tavares Werner, Cláudia M. Lima Santoro, Flávia Maria COPPE/PESC - Systems Engineering and Computer Science Program - UFRJ PO Box 68511 21945-970 Rio de Janeiro Brazil NP2Tec and Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil

ISBN: (纸本)9781457703874

Dynamism of day-to-day activities in organizations is inextricably linked and there is a variety of information, insight and reasoning being processed between people and systems, in carrying out a business process. We argue that flexibility in processes could be managed in real time, using context information collected in the work environment. This paper proposes a context management architecture approach that aims to improve and automate dynamic process adaptation. We explain how process adaptation may occur in real time and discuss a scenario for this proposal © 2011 IEEE.

关键词： Process design

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Mediating process adaptation through a goal-oriented context-aware approach

Mediating process adaptation through a goal-oriented context...

引用

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

作者： Nunes, Vanessa Tavares Werner, Cláudia M. Lima Santoro, Flávia Maria COPPE/PESC - Systems Engineering and Computer Science Program UFRJ PO Box 68511 21945-970 Rio de Janeiro Brazil NP2Tec and Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil

ISBN: (纸本)9781467312127

Complexity and dynamism of day-to-day activities in organizations are inextricably linked, one impacting the other, increasing the challenges for constant adaptation on the way to organize work to address emerging demands. Market is demanding systems that are aware of organizations processes and able to evolve and adapt to new situations in everyday working activities. We argue that flexibility in processes could be managed in real time, by PAIS (Process-aware Information systems), using context information collected in the work environment. This paper proposes CGAdapt, a context management architecture approach that aims to improve and automate dynamic process adaptation. We explain how process adaptation may occur in real time through an existent scenario using this proposal and discuss the value of context-awareness to reason about process alternative adaptations in a goal oriented approach. © 2012 IEEE.

关键词： Real time systems

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