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International Conference on Simulation and Modeling Methodologies, Technologies and Applications (SIMULTECH)

作者： Flávio Torres Filho Maria de Fátima Queiroz Vieira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Campina Grande Brazil Department of Electrical Engineering Federal University of Campina Grande Brazil

This paper presents a framework to support the development of three-dimensional virtual scenarios for an operator training simulator for electrical systems. Given the need to represent a variety of scenarios of interest, this can be an effort and time consuming task. The proposed framework promotes a systematic approach when building scenarios and is supported by tools from the ontology-based domain. An editing tool is also under construction. As it will be discussed in the paper, this approach resulted in the simplification of the scenario building process which is achieved by interchanging descriptions at different levels of abstraction. The descriptions concern the situation to be represented; plant objects' representation, both visual and behavioural, the latter represented as Coloured Petri Nets (CPN) models.

关键词： Training Ontologies Solid modeling Three-dimensional displays Buildings Substations Virtual environments

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The Effect of Elastic Modulus Rate in Stress Controlled Tests on the Modified Jeffrey's Model for Structured Fluids

The Effect of Elastic Modulus Rate in Stress Controlled Test...

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2014 2nd International Conference on Applied Mechanics,Materials,and Manufacturing(AMMM 2014)

作者： Tainan Gabardo Miranda dos Santos Hilbeth Parente Azikri de Deus Cezar Otaviano Ribeiro Negr?o Research Center for Non-Newtonian Fluids (CERNN) Post-graduate Program in Mechanical and Materials Engineering (PPGEM)Federal University of Technology-Paraná (UTFPR) Nucleus of Applied and Theoretcical Mechanics (Nu MAT) Post-graduate Program in Mechanical and Materials Engineering (PPGEM)Federal University of Technology-Paraná (UTFPR)

Structured fluids are known to be dependable of their structural *** of such fluids may be found in different industries as chemical,biomedical,manufacturing,food and *** mathematical models to describe structured fluids are normally composed by a coupled system:one constitutive equation(based on viscoelastic models) and one kinetics equation(an equation which describes the structural level evolution in time of the material).The works found in the literature use linear viscoelastic constitutive equations which do not account the dependence of the elastic modulus with the microstructural level in their fundamental *** this sense,the present work aims to evaluate,through numerical simulation,the effect of a new constitutive equation in rheological tests and compare its results to those of the model developed by Souza Mendes and Thompson(2013),in which those considerations are not made.

关键词： Structured fluids Thixotropy Stress controlled test

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A comparison of techniques and technologies for SSVEP classification

A comparison of techniques and technologies for SSVEP classi...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Richard M. G. Tello Sandra M. T. Müller Teodiano Bastos-Filho Andre Ferreira Post-Graduate Program of Electrical Engineering (PPGEE). UFES Vitoria Brazil Department of Computer and Electronics (CEUNES) Sao Mateus Brazil

This paper presents the evaluation of seven techniques of feature extraction (PSD, F-Test, EMD, MCE, CCA, LASSO and MSI) for gaze-target detections in a SSVEP-based BCI. Two type of technologies for visual stimulation were used (LCD and LEDs). Five differents windows lengths (1, 2, 4, 5 and 10 s) were used and seven volunteers participated in this study. The highest accuracy obtained in all cases was 93.57% using LEDs and the highest ITR was 36.90 bits/min for LCD. The technique based on MSI shows the highest success rate in both cases (LCD or LED) and is even more noticeable when the window size is increased.

关键词： Feature extraction Light emitting diodes Electroencephalography Correlation Electrodes Visualization Accuracy

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Comparison of new techniques based on EMD for control of a SSVEP-BCI

Comparison of new techniques based on EMD for control of a S...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Richard M. G. Tello Sandra Mara Torres Müller Teodiano Bastos-Filho Andre Ferreira Post-Graduate Program of Electrical Engineering (PPGEE). UFES Vitoria Brazil Department of Computer and Electronics (CEUNES) Sao Mateus Brazil

ISBN: (纸本)9781479924004

This paper presents the comparation of three different feature extraction techniques based on the Empirical Mode Decomposition (EMD) for a SSVEP-BCI. This approach based on the characterization of the signal by EMD, is proposed as a novel alternative to other techniques and it was demonstrated that it exceeds both in accuracy rate and Information Transfer Rate (ITR). The experiments were performed in an offline way, and seven volunteers participated of the study. The stimulis were generated both by LCD and LEDs. The frequencies used were 8, 11, 13 and 15 Hz. The results here reported such represent the average of the seven participants, achieving a success rate of 81% and ITR of 23.32 bits/min of the total set of cases analyzed. It is further confirmed that the highest success rates and ITRs were obtained for stimulation by LEDs.

关键词： Electrodes

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Surface modification of yttria-stabilized tetragonal zirconia with different glass based liners

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Dental Materials 2016年 32卷 e95-e96页

作者： D. Silva-Herzog Rivera D. Masuoka-Ito L.O. Sanchez-Vargas J.L. Menchaca-Arredondo A. Aragón-Piña B.I. Cerda-Cristerna Institutional Doctoral Program of Engineering and Materials Science Universidad Autónoma De San Luis Potosí México Mexico Dentistry Department Universidad Autónoma De Aguascalientes México Mexico Faculty of Physics and Mathematics Universidad Autónoma De Nuevo León México Mexico Research Center and Post-Graduate Studies Universidad Autónoma De San Luis Potosí México Mexico Faculty of Dentistry Río Blanco Universidad Veracruzana-Región Córdoba-Orizaba México Mexico

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Comparison among feature extraction techniques based on power spectrum for a SSVEP-BCI

Comparison among feature extraction techniques based on powe...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Javier Castillo-Garcia Sandra Müller Eduardo Caicedo Anibal Cotrina Teodiano Bastos Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria Brazil School of Electrical and Electronic Engineering Univesity of the Valle Cali Colombia

This paper presents a comparison among three methods for Steady-State Visually Evoked Potentials (SSVEP) detection. These techniques are based on Power Spectral Density Analysis (PSDA) and Canonical Correlation Analysis (CCA). The first method estimates the signal-to-noise ratio of the power spectrum in each stimulus frequency using PSDA, which is called Traditional-PSDA. The second analysis estimates the relation between the difference of the stimulus frequency and its neighbor frequencies, using the power spectrum in these neighbor frequencies, and seeks the neighbor frequency which presents the lowest relation value. This technique is referred to Ratio-PSDA. The third and final techniques called Hybrid-PSDA-CCA. The performances of the methods were evaluated using a database of electroencephalogram (EEG) signals. The EEG signals were recorded from 19 volunteers, from which six people present disabilities. They were stimulated with visual stimuli flickering at 5.6, 6.4, 6.9 and 8.0 Hz. The system performance was evaluated considering the accuracy, the Information Transfer Rate (ITR) and the computational cost for several windows length of each stimulus frequency. The results showed that the Hybrid-PSDA-CCA method achieved the best result with an average accuracy of 91.14%.

关键词： Accuracy Electroencephalography Correlation Computational efficiency Equations Educational institutions Brain-computer interfaces

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Measuring the radiation bands of overhead power lines glass insulators

Measuring the radiation bands of overhead power lines glass ...

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IEEE Conference on Antenna Measurements & Applications (CAMA)

作者： Pedro H. V. Rocha Glauco Fontgalland PPgEE-COPELE Post-Graduate Program in Electrical Engineering Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Campina Grande-PB Brazil

In this paper the characteristics radiation of overhead power lines glass insulators is investigated. Two feeding possibilities are used to analyze the radiation effects. The first feeding point is placed on the cap of the insulator and the second one is connected to the pin. The reflection coefficient (S 11 ) for two insulators covering the band of 30 MHz to 1 GHz was measured. The measurements were performed on insulators with different conservation states: one has a metal frame in good condition and the other one has both cap and pin parts rusted. The measured results show bands with good impedance matching (30 MHz to 200 MHz). The cleaned insulator reached S 11 = -18.7 dB at 127 MHz while -10.87 dB at 121.2 MHz was obtained for the rusty insulator. These spectral bands can be used in the analysis of insulator's conservation state and its interference characteristics.

关键词： Insulators Pollution measurement Transmission line measurements Glass Magnetic fields Resonant frequency Reflection coefficient

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Low-Power Energy Conversion Systems With Two-Phase PM Machine and a Rectifier with Reduced Number of Controlled Switches

Low-Power Energy Conversion Systems With Two-Phase PM Machin...

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IEEE Energy Conversion Congress and Exposition

作者： Cursino B. Jacobina Victor F. M. B. Melo Filipe A. da C. Bahia Italo Roger F. M. P. da Silva Electrical Engineering Department - Federal University of Campina Grande - UFCG Campina Grande Paraiba Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE - UFCG

ISBN: (纸本)9781479957774

This paper presents two energy conversion systems with two-phase permanent magnet (PM) machine and a rectifier with reduced number of controlled switches. The topologies are conceived with the purpose of converting wind energy into electrical energy (i.e., a wind energy conversion system (WECS)) for low power applications. Compared with some three-phase generation systems with reduced number of controlled switches, the proposed topologies permit obtaining sinusoidal controlled machine currents, reducing dc-link voltage and dq currents low harmonic distortion.

关键词： Topology Voltage control Harmonic distortion Legged locomotion Harmonic analysis Control systems Wind energy

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Organizational Trouble Shooting through Integration between the Theory of the Restrictions Thinking Process and Lean Tools

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Journal of Civil engineering and Architecture 2014年第6期8卷 738-745页

作者： Tatiana Gondim do Amaral Vitor Hugo Martins Resende Department of Post Graduate Degree Program in Geotechnical Civil Construction and Structure (PPGECON) FederalUniversity of Goidts Goidnia 74886044 Brazil Department of Engineering Catholic University of Golds Goiania 74605-220 Brazil

The theory of constraints thinking process, created by Israeli physicist Eliyahu M. Goldratt, has emerged as a tool for achieving competitive advantage. Many researches also focused on the application of lean thinking developed by Toyota and proposed by Ohno. This philosophy has been proven to be effective in several production processes. This paper aims to propose a method of problem solving through the integration of theory of constraints thinking process and the principles of lean production. As a tool for problem identification, the method defends the use of current reality tree and, to solve problems, the lean thinking tools, proposed by Picchi. The developed method was implemented in a contractor. The research methodology was research-action. Among the results, there was a realistic diagnosis about the core problems in company. According to this, the core problem of the contractor is “the lack of commitment of manpower” that results in the main problem “the financial loss”. The principle of perfection was verbalized as a proposal to solve the problems and the tools to be implemented for solving problems were “commitment of senior management to employees” and “simplicity in communication”.

关键词： Commitment people culture change agreement theory.

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Polymer concrete reinforced with luffa fibers: Effect of gamma radiation

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Revista Tecnica de la Facultad de Ingenieria Universidad del Zulia 2014年第3期37卷 22-29页

作者： Martínez-Barrera, Gonzalo Martínez-López, Miguel Vigueras-Santiago, Enrique Gencel, Osman Beycioglu, Ahmet Dos Reis, João Marciano Laredo Facultad de Química Universidad Autónoma del Estado de México Km.12 de la carretera Toluca-Atlacomulco San Cayetano Mexico Civil Engineering Department Faculty of Engineering Bartin University Bartin Turkey Civil Engineering Department Faculty of Technology Düzce University Düzce Turkey Theoretical and Applied Mechanics Laboratory - LMTA Mechanical Engineering Post Graduate Program - PGMEC Universidade Federal Fluminense - UFF RuaPasso da Pátria 156 Bl. E sala 216 Niterói RJ Brazil

The interest of many research groups regarding manufacture of composite materials by using natural fibers is increasing world-wide. The main objectives involve the improvement of mechanical properties, mainly those related to resistance and elasticity. In the present study in a first stage, polymer concrete specimens were elaborated by using an unsaturated polyester resin, silica sand and luffa fibers; after, they were gamma irradiated at different doses and their mechanical properties were evaluated. Two different silica particle sizes (0.15 mm and 0.6 mm), and four different luffa fiber concentrations (0.3, 0.6, 0.9 and 1.2 wt%) were used, as well as 50 and 100 kGy of radiation dose. The results show a gradually diminution of compressive strength and modulus of elasticity when adding luffa fiber concentration. Nevertheless, such mechanical features are increasing when polymer concrete is gamma irradiated.

关键词： Unsaturated polymers

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