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System for Conformity Assessment of Electrocardiographs

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13th International Conference on Biomedical engineering, ICBME 2008

作者： Silva, M.C. Gusmão, L.A.P. Barbosa, C.R.Hall Monteiro, E.Costa Post Graduation Program in Metrology Pontifícia Universidade Católica do Rio de Janeiro Brazil Electrical Engineering Department Pontifícia Universidade Católica do Rio de Janeiro Brazil

ISBN: (纸本)9783540928409

Safety and performance assessment are essential for most medical devices. In some countries they are mandatory at least prior to the launch of the equipment in the market. Aiming at contributing with the assurance of the metrological reliability of analog and digital electrocardiographs (ECGs), this work presents the development of a system for ECG conformity assessment according to IEC 60601-2-51 and OIML R90 standards. The proposed system has been calibrated with traceability to SI units and is structured in two subsystems: evaluation of electrical safety and evaluation of performance. The first subsystem performs grounding tests, leakage current tests and insulation tests, and is based on commercial equipment. The second subsystem evaluates the metrological characteristics of ECGs and is composed by software in LabVIEW, a digital-to-analog converter and three signal conditioners. The system has been evaluated using two digital ECGs in use in a public hospital of Rio de Janeiro. The tests performed indicate that the system complies with the requirements of IEC 60601-2-51. It has been observed a maximum error on the standard signals lower than 1% during the calibration of the equipment that integrates the performance evaluation subsystem. The non-conformities observed during the system validation by means of ECG essays were probably due to the high noise level present in the hospital environment, being necessary the continuous use of digital filters. Also, limitations on the system concerning common-mode rejection ratio, temperature drift and reticulate of time and amplitude have been observed and solutions are being studied.

关键词： Digital filters

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A Study of the Effect of Illumination Conditions and Color Spaces on Skin Segmentation

A Study of the Effect of Illumination Conditions and Color S...

引用

Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： Diogo Kuiaski Hugo Vieira Neto Gustavo Borba Humberto Gamba Post-graduation Program in Electrical Engineering and Industrial Informatics Federal University of Technology of Paraná (UTFPR) Curitiba Parana Brazil

This work aims at investigating the influence of luminance information and environment illumination on skin classification. We explore Bayesian approaches to perform automatic classification of human skin pixels on digital images, using color features as input. Two probabilistic skin color models were built on different color spaces (RGB, normalized RG, HSI, HS, YCbCr and CbCr) and tested in a task of automatic pixel classification into skin and non-skin. Analyses of classification performance were done by presenting an illumination controlled image database containing images acquired in four different illumination conditions (shadow, sun, incandescent and fluorescent lights) to these classifiers. Our experiments show that building probabilistic skin color models using the CbCr color space generally improves performance of the classifiers and that best performance is achieved in shadow illumination.

关键词： Lighting Skin Image segmentation Bayesian methods Humans Pixel Digital images Roentgenium Automatic testing Image analysis

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Psim mathematical tools to simulate pem fuel cells including the power converter

Psim mathematical tools to simulate pem fuel cells including...

引用

Annual Conference of Industrial Electronics Society

作者： L. P. Lima F. A. Farret D. B. Ramos F. Z. Ferrigolo H. W. Stangarlin J. G. Trapp A. B. Serdotte Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering Center of Technology Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

This paper presents a mathematical model for proton exchange membrane fuel cells (PEMFCs) taking into account the basic electrochemical equations but including the boost power converter. This approaching is suitable for design and simulation of power electronics systems with embedded FCs as power supplies. The simplified model uses the Kirchoff's voltage law (KVL) applied to the conventional electric equivalent model of PEMFCs. This work is fully implemented in PSim¿ as a general mathematical model and referred to literature data including the boost converter, mostly used as the power interface for FCs. In this way, the model is fully evaluated by viewing the interface just as a power converter.

关键词： Fuel cells Mathematical model Power system modeling Protons Biomembranes Equations Power electronics Power supplies Voltage Kirchhoff's Law

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Evolvable hardware applied to nanotechnology

Evolvable hardware applied to nanotechnology

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1st NASA/ESA Conference on Adaptive Hardware and Systems, AHS 2006

作者： Neto, Omar Paranaiba Vilela Pacheco, Marco Aurélio C. Masiero, Leone Pereira Barbosa, Carlos R. Hall Department of Electrical Engineering PUC-Rio Rio de Janeiro Brazil Post Graduation Program in Metrology PUC-Rio Rio de Janeiro Brazil

ISBN: (纸本)0769526144

This manuscript proposes the automatic design and synthesis of nanometer circuits and the optimization of molecular devices by the evolvable hardware technique. The potential of Evolvable Hardware is investigated by means of three different applications: synthesis of molecular electronic circuits, synthesis and optimization of Quantum-dot Cellular Automata (QCA) and the optimization of OLED (Organic Light-Emitting Diodes) parameters. The molecular electronic circuit synthesis is developed using the molecular transistor simulated in SPICE. QCA is a new paradigm used in the development of digital logical circuits, not using the flow of current. This new paradigm allows the development of a new generation of computers, faster and with smaller energy dissipation. Finally, the optimization of OLED parameters is developed using the electrical behavior model of a multi-layer device. In this model, each sub-layer in the emissive layer has a ratio of ETM (Electron Transport Material) and a ratio of HTM (Hole Transport Material). The first results show that the technique is able to synthesize and optimize circuits that perform the logic specified by the user, avoiding noise and other problems that could lead to malfunction. Moreover, the EHW technique is able to optimize the parameters of an organic device, such as OLED. © 2006 IEEE.

关键词： Computer hardware

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Evolvable Hardware Applied to Nanotechnology

Evolvable Hardware Applied to Nanotechnology

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NASA/ESA Conference on Adaptive Hardware and Systems (AHS)

作者： O.P. Vilela Neto L. Pereira Masiero M.A. C. Pacheco C.R. Hall Barbosa Department of Electrical Engineering PUC-Rio Rio de Janeiro Brazil Post Graduation Program in Metrology PUC-Rio Rio de Janeiro Brazil

This manuscript proposes the automatic design and synthesis of nanometer circuits and the optimization of molecular devices by the evolvable hardware technique. The potential of evolvable hardware is investigated by means of three different applications: synthesis of molecular electronic circuits, synthesis and optimization of quantum-dot cellular automata (QCA) and the optimization of OLED (organic light-emitting diodes) parameters. The molecular electronic circuit synthesis is developed using the molecular transistor simulated in SPICE. QCA is a new paradigm used in the development of digital logical circuits, not using the flow of current. This new paradigm allows the development of a new generation of computers, faster and with smaller energy dissipation. Finally, the optimization of OLED parameters is developed using the electrical behavior model of a multi-layer device. In this model, each sub-layer in the emissive layer has a ratio of ETM (electron transport material) and a ratio of HTM (hole transport material). The first results show that the technique is able to synthesize and optimize circuits that perform the logic specified by the user, avoiding noise and other problems that could lead to malfunction. Moreover, the EHW technique is able to optimize the parameters of an organic device, such as OLED

关键词： Hardware Nanotechnology Circuit synthesis Organic light emitting diodes Quantum cellular automata Molecular electronics Nanoscale devices Design optimization Quantum dots Computational modeling

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Preliminary comparison of different neural-fuzzy mappers for load curve short term prediction

Preliminary comparison of different neural-fuzzy mappers for...

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Seminar on Neural Network Applications in electrical engineering

作者： Dzenana Malkocevic Tatjana Konjic Vladimiro Miranda TEMPUS CEFES post-graduation program Universities of Tuzla (BiH) Novi Sad Serbia Faculty of Electrical Engineering University of Tuzla Bosnia and Herzegovina INESC Porto research institute University of Porta Portugal

This paper is written with the didactic purpose of exploring and indicating possibilities to power companies in the Balkan region for the application of adaptive neuro-fuzzy inference system (ANFIS) models in load prediction with real load data set. ANFIS models were trained and tested using 15-minute load data collected in Portugal by the electric power company EDP during a 42 day period. Simulation results gave promising results especially considering small size of used data set. Although the objective of the paper is to demonstrate possibilities for practical implementation, further research and improvement including the contributions of similar approaches in the world must be done

关键词： Power system modeling Load forecasting Power system dynamics Adaptive systems Predictive models Power system control Power system planning Neural networks Fuzzy systems Power systems

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Reconfigurable Gang Scheduling Algorithm

Reconfigurable Gang Scheduling Algorithm

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10th International Workshop on Job Scheduling Strategies for Parallel Processing, JSSPP 2004

作者： Góes, Luís Fabrício Wanderley Da Silva Martins, Carlos Augusto Paiva Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Av. Dom José Gaspar 500 Belo Horizonte Minas Gerais Brazil

Using a single traditional gang scheduling algorithm cannot provide the best performance for all workloads and parallel architectures. A solution for this problem is an algorithm that is capable of dynamically changing its form (configuration) into a more appropriate one, according to environment variations and user requirements. In this paper, we propose, implement and analyze the performance of a Reconfigurable Gang Scheduling Algorithm (RGSA) using simulation. A RGSA uses combinations of independent features that are often implemented in GSAs such as: packing and re-packing schemes (alternative scheduling etc.), multiprogramming levels etc. Ideally, the algorithm may assume infinite configurations and it reconfigures itself according to entry parameters such as: performance metrics (mean utilization, mean response time of jobs etc.) and workload characteristics (mean execution time of jobs, mean parallelism degree of jobs etc.). Also ideally, a reconfiguration causes the algorithm to output the best configuration for a particular situation considering the system's state at a given moment. The main contributions of this paper are: the definition, proposal, implementation and performance analysis of RGSA. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Parallel processing systems

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Development of a low intensity magnetic field transducer for biomedical application based on the Giant Magnetoimpedance effect

Development of a low intensity magnetic field transducer for...

引用

International Measurement Federation, IMEKO - Symposium on Metrology and Measurement Applications in the Era of Internet Working 2005

作者： Pompéia, Flávia Gusmão, Luiz A.P. Barbosa, Carlos H. Monteiro, Elisabeth C. Gonsalves, Lídice A.P. MacHado, Fernando L.A. Post Graduation Program in Metrology Pontifícia Universidade Católica Do Rio de Janeiro PUC-Rio 22453-900 Rio de Janeiro Brazil Department of Electrical Engineering PUC-Rio Rio de Janeiro Brazil Department of Physics UFPE Recife Brazil Department of Material Engineering Universidade Federal de Pernambuco UFPE Recife Brazil

ISBN: (纸本)9781622766970

This manuscript presents the development of a low intensity magnetic field transducer, based on the Giant Magnetoimpedance (GMI) effect, to be used for biomedical applications. The GMI effect is a characteristic of some ferromagnetic materials, due to which it is observed a large variation of the material impedance due to external dc magnetic fields. We describe the effect, the transducer configuration, the electronic circuits and the preliminary results obtained so far. A sensitivity comparable to a fluxgate probe has already been obtained, and the theoretical calculations indicate the possibility of further enhancing this figure of merit.

关键词： Ferromagnetic materials

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RJSSim: A reconfigurable job scheduling simulator for parallel processing learning 33

RJSSim: A reconfigurable job scheduling simulator for parall...

引用

33rd Annual Frontiers in Education, FIE 2003

作者： Góes, Luís F.W. Martins, Carlos A.P.S. Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil Pontifical Catholic University of Minas Gerais Computer Science Department Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil

ISBN: (纸本)0780379616

In this work, we present and analyze the use of a reconfigurable job scheduling simulator called RJSSim as an aid tool for parallel processing learning. This software is a functional and performance Java-based simulator of job scheduling policies. Our objectives are: to present RJSSim;to show the use of RJSSim and reconfigurability concepts for parallel processing learning. First, we present a prototype of RJSSim and the reconfigurability concept. Then we describe two case studies remarking the main parallel processing concepts and skills students can learn. In the first case study, we analyze two parallel algorithm models. In the second, we do some performance tests among parallel (reconfigurable) scheduling policies and architectures. Then, we analyze the performance through some metrics like response time, idle time etc. Finally we discuss and analyze the use of RJSSim for parallel processing learning. Our main contribution is: an implementation of RJSSim for parallel processing learning. © 2003 IEEE.

关键词： Parallel algorithms

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Performance analysis of parallel programs using prober as a single aid tool 14

Performance analysis of parallel programs using prober as a ...

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14th Symposium on Computer Architecture and High Performance Computing

作者： Góes, LFW Ramos, LES Martins, CAPS Informatics Institute Post-Graduation Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Brazil

ISBN: (纸本)0769517722

Prober is a functional and performance analysis tool for parallel programs, developed during an undergraduate research project. In this paper we show the new expanded version of Prober, in which some features from different software tools are aggregated. It can be used as a single tool to aid the developer in the performance analysis of parallel programs. Our main goal is to provide a new version of Prober, with additional features. Among them we can highlight: the interpretation of user scripts, a user-level support library the generation of speedup and efficiency graphics, batch execution and a new user interface. In order to show, verify and analyze the use of the new version of Prober, we did performance tests in a parallel image convolution program. We added performance measuring routines to collect performance data within different internal code segments;built a set of scripts to specify the performance tests;ran the set of scripts in batch mode;used Prober to generate graphics and statistics based on the collected performance data;and analyzed the results rising Prober as an aid tool.

关键词： Convolution Graphics Image analysis Image segmentation Performance analysis Radio access networks Software libraries Software tools Testing User interfaces

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