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Transmission power levels Prediction for Distributed Topology Control Protocols within parameterized scenarios

Transmission power levels Prediction for Distributed Topolog...

引用

International Conference on Telecommunications (ICT)

作者： S. Kostin L.B. de Pinho C.L. de Amorim Parallel Computing Laboratory COPPE Systems Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil Parallel Comput. Lab. - COPPE Syst. Eng. Program Fed. Univ. of Rio de Janeiro Rio de Janeiro

Distributed topology control protocols (DTCP) for wireless sensor networks (WSN) coordinate nodespsila decisions regarding their transmission ranges, in order to set up a network with a certain connectivity, while reducing nodespsila energy consumption and/or increasing network capacity. The key issue in DTCP is to choose the most suitable transmission power level (TPL) among those available for each sensor node in a distributed manner. We present a method to predict the TPLs for DTCP in realistic scenarios, which takes into account several propagation phenomena, such as barriers and multipath interference. To evaluate the effectiveness of our approach, we simulated the radio propagation pattern of a WSN in a scenario of multiple rooms. Our results suggested that our method allows to predict, with reasonable accuracy, the approximate TPLs distribution achieved by different DTCP approaches within a given parameterized scenario.

关键词： Wireless sensor networks Receivers Transmitters Topology Protocols Computational modeling Network topology

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Transactional WaveCache: Towards Speculative and Out-of-Order DataFlow Execution of Memory Operations

Transactional WaveCache: Towards Speculative and Out-of-Orde...

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International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD)

作者： Leandro A.J. Marzulo Felipe M.G. Franca Vítor Santos Costa Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Departmento de Ciência de Computadores Universidade do Porto Porto Portugal

The WaveScalar is the first dataflow architecture that can efficiently provide the sequential memory semantics required by imperative languages. This work presents a speculative memory disambiguation mechanism for this architecture, the transaction WaveCache. Our mechanism maintains the execution order of memory operations within blocks of code, called waves, but adds the ability to speculatively execute, out-of-order, operations from different waves. This mechanism is inspired by progress in supporting transactional memories. Waves are considered as atomic regions and executed as nested transactions. Wave that have finished the execution of all their memory operations are committed, as soon as the previous waves are also committed. If a hazard is detected in a speculative wave, all the following waves (children) are aborted and re-executed. We evaluated the transactional WaveCache on a set of benchmarks from Spec 2000, Mediabench and Mibench (telecomm). Speedups ranging from 1.31 to 2.24 (related to the original WaveScalar) where observed when the benchmark doesn't perform lots of emulated function calls or access memory very often. Low speedups of 1.1 to slowdowns of 0.96 were observed when the opposite happens or when the memory concurrency was high.

关键词： Out of order Computer architecture Parallel processing High performance computing Telecommunications Concurrent computing Hardware Data engineering systems engineering and theory Computer science

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

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

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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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Memory-Aware and Efficient Ray-Casting Algorithm

Memory-Aware and Efficient Ray-Casting Algorithm

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Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： Saulo Ribeiro Andre Maximo Cristiana Bentes Antonio Oliveira Ricardo Farias COPPE-Systems Engineering Program Federal University of Rio de Janeiro Brazil Department of Systems Engineering State University of Rio de Janeiro Brazil

Ray-casting implementations require that the connectivity between the cells of the dataset to be explicitly computed and kept in memory. This constitutes a huge obstacle for obtaining real-time rendering for very large models. In this paper, we address this problem by introducing a new implementation of the ray-casting algorithm for irregular datasets. Our implementation optimizes the memory usage of past implementations by exploring ray coherence. The idea is to keep in main memory the information of the faces traversed by the ray cast through every pixel under the projection of a visible face. Our results show that exploring pixel coherence reduces considerably the memory usage, while keeping the performance of our algorithm competitive with the fastest previous ones.

关键词： Rendering (computer graphics) Computer graphics systems engineering and theory Computed tomography Image processing Data engineering Coherence Sorting Hardware Data structures

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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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Logic as energy: A SAT-based approach

Logic as energy: A SAT-based approach

引用

2nd International Symposium on Brain, Vision, and Artificial Intelligence, BVAI 2007

作者： Lima, Priscila M. V. Morveli-Espinoza, M. Mariela M. França, Felipe M. G. LAM - Computer Architecture and Microelectronics Laboratory Universidade Federal Do Rio de Janeiro Brazil Departament d'Informàtica Universitat Autònoma de Barcelona Spain COPPE - Systems Engineering and Computer Science Program Universidade Federal Do Rio de Janeiro Brazil

ISBN: (纸本)3540755543

This paper presents the implementation of ARQ-PROP II, a limited-depth propositional reasoner, via the compilation of its specification into an exact formulation using the satyrus platform. satyrus' compiler takes as input the definition of a problem as a set of pseudo-Boolean constraints and produces, as output, the Energy function of a higher-order artificial neural network. This way, satisfiability of a formula can be associated to global optima. In the case of ARQ-PROP II, global optima is associated to Resolution-based refutation, in such a way that allows for simplified abduction and prediction to be unified with deduction. Besides experimental results on deduction with ARQ-PROP II, this work also corrects the mapping of satisfiability into Energy minima originally proposed by Gadi Pinkas. © 2007 Springer-Verlag Berlin Heidelberg.

关键词： Neural networks

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

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

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IEEE International Symposium on Intelligent Signal Processing

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

ISBN: (纸本)1424408296;97

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 0.5degC (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.

关键词： Temperature Nonhomogeneous media Medical treatment Ultrasonic imaging Instruments Feedforward systems Radial basis function networks Genetic algorithms Hyperthermia Computational complexity

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Efficient support to scalable delivery of VoD systems using collocated access points

Efficient support to scalable delivery of VoD systems using ...

引用

International Conference on Networking, International Conference on systems andInternational Conference on Mobile Communications and Learning Technologies, ICN/ICONS/MCL'06

作者： Bidese De Pinho, Leonardo Luis De Amorim, Claudio COPPE Systems Engineering Program Federal University of Rio de Janeiro Brazil

ISBN: (纸本)0769525520

In this work we propose Early Released First (ERF) and Bounded ERF (BERF) two new application-friendly heuristics that support scalable delivery of video-on-demand (VoD) to mobile devices. The key idea behind ERF and BERF heuristics is to exploit the slack of time known as the patience factor that VoD applications typically provide. To evaluate the benefits of ERF and BERF we coupled them to the Wireless Channel Manager (WCM) an association control unit we developed previously that schedules clients to collocated access points (APs) operating on 802.11 networks. Our simulated results indicated that ERF and BERF reduced overall blockage rate of video requests significantly and that the resulting system, which we called Cluster of INexpensive Access PointS (CINAPS), showed considerable scalability gains on VoD delivery. © 2006 IEEE.

关键词： Video on demand

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An alternative QoS architecture for the IEEE 802.16 Standard 06

An alternative QoS architecture for the IEEE 802.16 Standard

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2nd Conference on Future Networking Technologies, CoNEXT'06

作者： De Moraes, Luís Felipe M. Maciel, Paulo Ditarso Systems Engineering and Computer Science Program - COPPE/UFRJ HighSpeed Networks Laboratory RAVEL Rio de Janeiro RJ Brazil

In this paper, we propose an alternative QoS architecture for the IEEE 802.16 Standard, that incorporates a priority based packet scheduling and a new traffic shaping. For this, we present the ideas of a traffic condi... 详细信息

ISBN: (纸本)1595934561

关键词： Quality of service

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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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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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