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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： A. López-Delis D. Delisle-Rodríguez A. C. Villa-Parra T. Bastos-Filho Biophysics Medical Center University of Oriente Santiago de Cuba Cuba Post-graduate Program of Electrical Engineering Federal University of Espirito Santo Brazil Post-graduate Program of Electrical Engineering Federal University of Espirito Santo Brazil and GIIB Universidad Politécnica Salesiana Cuenca Ecuador

ISBN: (纸本)9781424492695

A prominent change is being carried out in the fields of rehabilitation and assistive exoskeletons in order to actively aid or restore legged locomotion for individuals suffering from muscular impairments, muscle weakness, neurologic injury, or disabilities that affect the lower limbs. This paper presents a characterization of knee motion patterns from Surface Electromyography (sEMG) signals, measured in the Erector spinae (ES) muscle. Feature extraction (mean absolute value, waveform length and auto-regressive model) and pattern classification methods (Linear Discrimination Analysis, K-Nearest Neighborhood and Support Vector Machine) are applied for recognition of eight-movement classes. Additionally, several channels setup are analyzed to obtain a suitable electrodes array. The results were evaluated based on signals measured from lower limb using quantitative metric such as error rate, sensitivity, specificity and predictive positive value. A high accuracy (> 95%) was obtained, which suggest that it is possible to detect the knee motion intention from ES muscle, as well as to reduce the electrode number (from 2 to 3 channels) to obtain an optimal electrodes array. This implementation can be applied for myoelectric control of lower limb active exoskeletons.

关键词： Erector spinae sEMG signals knee motion intention time-frequency features pattern classification Davies-Bouldin criterion

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Analysis of the resonant behavior of FSS using matryoshka geometry

Analysis of the resonant behavior of FSS using matryoshka ge...

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SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, IMOC 2015

作者： Neto, Alfrêdo Gomes E Silva, Jefferson C. De Carvalho, Joabson Nogueira Cruz, Josiel Do Nascimento Ferreira, Hillner De Paiva Almeida Group of Telecom. and Applied Electromagnetism Federal Inst. of Educ. Science and Technology of Paraíba GTEMA IFPB João PessoaPB Brazil Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil

ISBN: (纸本)9781467394925

In this paper the resonant behavior of frequency selective surfaces, FSS, using matryoshka geometry is analyzed considering polarizations x and y. The basics of the FSS using matryoshka geometry are described for usual and open cases, including an expression to estimate the first resonant frequency. Initially, the FSS with two concentric square rings is considered and its resonant behavior analyzed. Then, the resonant behavior of FSS with two rings matryoshka geometry is examined. The analysis is based on the electric current distribution obtained using the commercial software ANSYS-Designer. With a better understanding of the resonance nature in matryoshka geometry the design parameters can be better adjusted and desired frequency responses properly achieved. © 2015 IEEE.

关键词： Geometry

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Fault tolerance performance of two hybrid six-phase drive systems under single-phase open-circuit fault operation 32

Fault tolerance performance of two hybrid six-phase drive sy...

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32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017

作者： Melo, Victor F. M. B. Jacobina, Cursino B. Rocha, Nady Filho, Edgar R. B. Post-Graduate Program in Electrical Engineering PPgEE - COPELE - UFCG Campina Grande Paraíba Brazil Federal Institute of Pernambuco IFPE Afogados da Ingazeira Brazil Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Federal University of Paraíba - UFPB - João Pessoa Paraíba Brazil

ISBN: (纸本)9781509053667

This paper discusses the fault tolerance performance of two hybrid six-phase drive systems under single-phase open-circuit fault. The topologies are considered to be hybrid because each of the two three-phase groups of the six-phase machine is connected to a different type of converter. One group is connected to a two-level converter and the other group is connected to a dual converter in an open-end arrangement. A compensation strategy is discussed in order to keep the rated operation even after the occurrence of the fault. The six-phase machine mathematical model after the fault is presented and utilized to elaborate the compensation strategy. Simulation and experimental results show the validity of the discussed solutions. © 2017 IEEE.

关键词： Timing circuits

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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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Three-Phase Integrated PFC AC-AC Half-Bridge Boost Rectifier and Class D Resonant Inverter with Weak Coupled Coils for IH Application

Three-Phase Integrated PFC AC-AC Half-Bridge Boost Rectifier...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Ruan C. M. Gomes Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering (PPgEE–COPELE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

ISBN: (数字)9781728148298

ISBN: (纸本)9781728148304

This paper presents a three-phase integrated PFC AC-AC resonant inverter with boost effect for Induction Heating (IH) Application. This converter is composed by three independent half-bridge boost rectifier and class D resonant inverters with non-smoothed DC link that achieve high power factor operation. The magnetic coupling of the three coils was measured for characterizing the resonant behavior of the arrangement. Experimental results validate the modes of operation with ZVS and the converter performance in the entire power input range (PF and THD).

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DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix Inverter

DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix...

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European Conference on Power Electronics and Applications

作者： Ailton do E. Dutra Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering (PPgEE-COPELE) FEDERAL UNIVERSITY OF CAMPINA GRANDE (UFCG) Campina Grande PB Brazil

In this work it is proposed a multilevel T-type configuration for a high-frequency pulsating DC-link inverter for three-phase applications. The configuration consists of two DC/DC-pulsating converters cascaded with a DC-link capacitor-less three-phase three-level T-type inverter. Due to the absence of DC-link electrolytic capacitors, the proposed inverter guarantees a long lifetime and high power density. The DC-DC-pulsating converters aim to generate the high-frequency pulsating DC-link waveform profiles which have to be synchronized with the three-phase inverter PWM. Comparing to the conventional PWM, the proposed technique presents reduced switching losses due to the fact only one leg commutes during a switching period while the other two legs keep clamped in high or low impedance. Details of control strategy and modulation are presented, such as experimental results to validate the theoretical approach.

关键词： Inverters Legged locomotion Europe Capacitors Pulse width modulation

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Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak Coupled Coils for Induction Heating Application

Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak...

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IEEE Energy Conversion Congress and Exposition

作者： Ruan C. M. Gomes Montie A. Vitorino Diego A. Acevedo-Bueno Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering (PPgEE–COPELE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

This paper proposes a 4.3 kW three-phase integrated PFC AC-AC resonant inverter for Induction Heating (IH) Application. This converter is composed by three independent resonant inverters with non-smoothed DC link that achieves high power factor operation. The magnetic coupling of the three coils was modeled by using the impedance matrix for characterizing the resonant behavior of the arrangement. The coils arrangement with weak coupling between coils is applied for induction water heater. Experimental results validate the modes of operation with ZVS and the converter performance in the entire power input range (PF and THD).

关键词： Coils DH-HEMTs Magnetic noise Magnetic resonance Magnetic shielding Couplings Impedance

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Four-Port AC/DC-DC/AC Dual Active Bridge Based Converter

Four-Port AC/DC-DC/AC Dual Active Bridge Based Converter

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European Conference on Power Electronics and Applications

作者： Diego A. Acevedo-Bueno José D. G. da Silva Jonatas R. Kinas Montiê A. Vitorino Antonio M. N. Lima Edison R. C. da Silva Alexandre C. Oliveira Post-Graduate Program in Electrical Engineering (PPgEE – COPELE) FEDERAL UNIVERSITY OF CAMPINA GRANDE (UFCG) Campina Grande PB Brazil

In this paper, a Four-Port AC/DC-DC/AC conversion system is proposed using two full-bridge converters and a high-frequency transformer following the principle of Dual Active Bridge Converter. Two full-bridge AC/DC single-phase converters are connected by coupling their boost inductance to create a high-frequency transformer of the resulting proposed converter. The isolated power transfer between converters is controlled by the duty cycles and the phase-shift applied to the primary and secondary of the split transformer. The boundaries of the switching modes and the power transferred through the high-frequency transformer were obtained analytically. The system feasibility was validated by simulations and by a 300 W prototype with 94.9% maximum efficiency.

关键词： Bridge circuits Inductance Europe Windings Magnetization Switches Boundary conditions

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Design of active orthoses for a robotic gait rehabilitation system

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Frontiers of Mechanical engineering 2015年第3期10卷 242-254页

作者： A. C. VILLA-PARRA L. BROCHE D. DELISLE-RODRIGUEZ R. SAGARO Y. BASTOS A. FRIZERA-NETO Post-Graduate Program in Electrical Engineering Universidade Federaldo Espirito Santo Vit6ria 29075-910 Brazil Grupo de Investigacion en Ingenieria Biomodica GIIB UniversidadPolitdcnica Salesiana Cuenca 010105 Ecuador Mechanical and Design Engineering Department Universidad deOriente Santiago de Cuba 90500 Cuba Center of Medical Biophysics Universidad de Oriente Santiago deCuba 90500 Cuba

An active orthosis （AO） is a robotic device that assists both human gait and rehabilitation therapy. This work proposes portable AOs, one for the knee joint and another for the ankle joint. Both AOs will be used to complete a robotic system that improves gait rehabilitation. The requirements for actuator selection, the biomechanical considerations during the AO design, the finite element method, and a control approach based on electroencepha-lographic and surface electromyographic signals are reviewed. This work contributes to the design of AOs for users with foot drop and knee flexion impairment. However, the potential of the proposed AOs to be part of a robotic gait rehabilitation system that improves the quality of life of stroke survivors requires further investigation.

关键词： active orthosis gait rehabilitation,electroencephalography surface electromyography

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