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Computing stress-related emotional state via frontal cortex asymmetry to be applied in passive-ssBCI

Computing stress-related emotional state via frontal cortex ...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Anibal C. Atencio Javier C. Garcia Alessandro B. Benevides Berthil B. Longo Andre Ferreira Alexandre Porner-Escher Maria Dolores P. de Souza Teodiano Bastos Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria ES Brazil Post-Graduate Program of Biotechnology Federal University of Espirito Santo Vitoria ES Brazil Universidade Federal do Espirito Santo Vitoria ES BR Post-Graduate Program of Psychology Federal University of Espirito Santo Vitoria ES Brazil

The identification of stress-related emotional states allows the use of a passive single-switch BCI (passive-ssBCI) together with a main multi-class BCI. Thus, the passive-ssBCI could work in the background of the main BCI, allowing it to recognize stress-related emotions and to switch to a “stress mode”, which allows a better adaptation to the user current mental state, leading the system to better success rates. Frontal cortex asymmetry gave evidence that greater right frontal activity seems to be more highly related to negative emotional states. In this work, index of asymmetry of alpha band was computed by comparing the power of contra-lateral frontal electrodes. Discrete Wavelet transformation was used to decompose the EEG signals in frequency bands. The power spectral density was then calculated using modified Hamming periodogram. Signals from a public database for the analysis of human affective states, which was labeled with volunteers self-assessment scores, were employed. In order to label negative stress-related emotional state, rules based on valence, arousal and dominance dimensional emotions were defined. The results were promissory, because computed index of asymmetry in the alpha band indicated activity into the right frontal hemisphere was higher than the left one for seven out of nine volunteers during negative emotional states. This index could be employed as switch to a “stress mode” in a passive-ssBCI.

关键词： Indexes Electroencephalography Electrodes Frequency estimation Emotion recognition Switches

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AC drive systems based on six-phase machine with three neutrals

AC drive systems based on six-phase machine with three neutr...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Reuben P. R. Sousa Cursino B. Jacobina Victor F. B. Melo Nayara B. de Freitas Post-Graduate Program in Electrical Engineering - PPgEE Bairro Universitário Campina Grande Paraíba Brazil Department of Electrical Engineering - DEE Bairro Universitário Campina Grande Paraíba Brazil

This paper presents an AC drive system based on six-phase machine with three neutrals. The machine side converter has nine power legs and can be connected to the grid through one single DC-link or three isolated DC-links. Compared with the conventional back-to-back AC six-phase machine drive system, the proposed drive system permits reducing the DC-link voltages, eliminating step-up transformer, and the voltage at the grid side converter has higher amplitude than that of the machine side, reducing the transmission I 2 R losses. The system model and PWM strategy are presented and experimental results demonstrate the feasibility of the system.

关键词： Vectors Inverters Pulse width modulation Torque Integrated circuit modeling Switches electrical engineering

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Distributed approach for channel quality estimation using dedicated nodes in industrial WSN 25

Distributed approach for channel quality estimation using de...

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2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014

作者： Gomes, Ruan D. Rocha, Glaucio B. Filho, Abel C. Lima Fonseca, Iguatemi E. Alencar, Marcelo S. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande Paraíba Brazil Informatic Coordination Federal Institute of Paraíba Guarabira Paraíba Brazil Informatic Center Federal University of Paraiba João Pessoa Paraíba Brazil Mechanical Engineering Department Federal University of Paraiba João Pessoa Paraíba Brazil

ISBN: (纸本)9781479949120

A way to deal with the variations in the link quality of Wireless Sensor Networks (WSN) is the use of strategies for Dynamic Channel Allocation (DCA). The first step to perform DCA is estimating the channel quality, so that the network nodes can decide if a channel change is needed, and the best channel to be used. This paper proposes a distributed approach with nodes dedicated to monitor channel quality, by using the Received Signal Strength Indication (RSSI) and the Link Quality Indicator (LQI) to identify low quality channels. This approach is acceptable in industrial WSN, since the network deployment can be performed with adequate planning. Furthermore, the sensor nodes do not need to stop their operation for monitoring the channel quality. As a first step, experiments were performed in a real industrial environment to identify the relation between RSSI and LQI traces, and the Packet Error Rate for different channels, by using IEEE 802.15.4 radios operating in the 2.4 GHz band. © 2014 IEEE.

关键词： Sensor nodes

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Using linear discriminant function to detect eyes closing activities through alpha wave

Using linear discriminant function to detect eyes closing ac...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Denis Delisle-Rodriguez Javier F. Castillo-Garcia Teodiano Bastos-Filho Anselmo Frizera-Neto Alberto Lopez-Delis Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria Brazil Center of Medical Biophysic University of Oriente Santiago de Cuba Cuba

This work presents an alternative method to detect events correlated to eyes opening and closing, based on electroencephalography (EEG) measured from the occipital lobe. The goal is to propose a method based on linear discriminant function to classify segments of EEG signals that contain activities originated by eyes closing. A linear discriminant function presented by Fisher is employed to detect these activities on segments of 2s. This method showed a good values of sensitivity (SE ≥ 85 %) and specificity (SP ≥ 60 %). This approach can be used to control the switching of a brain computer interface (BCI).

关键词： Electroencephalography Training Fractals Testing Sensitivity Switches Sensitivity and specificity

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A software framework for user-level power management

A software framework for user-level power management

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IEEE International Conference on Consumer Electronics - Berlin (ICCE-Berlin)

作者： Bruna M. J. C. Vilar Diógenes G. Gondim Zeus C. Barros Frederico M. Bublitz Hyggo O. Almeida Angelo Perkusich Post-Graduate Program in Electrical Engineering–PPgEE–COPELE Embedded Systems and Pervasive Computing Lab Center for Strategic Technologies in Health–NUTES State University of Paraiba–UEPB Electrical Engineering Department (DEE) Federal University of Campina Grande–UFCG

Most operating systems implement their own power management techniques, but it is hard to modify or hack their power policies without the source code. Many dynamic power management architectures have been proposed in the literature, but they are not integrated with the underlying OS power manager. In this work, we propose a software framework for user-level power management, with a flexible architecture to be adapted to different policies and integrated with OS power managers.

关键词： Power demand Middleware Operating systems Network interfaces Mathematical model Estimation

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An Ethernet sniffer for On-line acquisition of EEG with the BrainNet36® device applied to a BCI

An Ethernet sniffer for On-line acquisition of EEG with the ...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Alessandro Botti Benevides Anibal Cotrina Atencio Javier Castillo Teodiano Freire Bastos Filho Alessander Botti Benevides Electrical Engineering Post-Graduate Program Federal University of Espirito Santo Vitória Espírito Santo Brazil ICT Doctoral School University of Trento Trento Trentino Italy

This paper presents an Ethernet sniffer programmed in ANSI C to export in an on-line way the electroencephalographic (EEG) data acquired with the device BrainNet36 ® , which is a Brazilian EEG device for clinical and polysomnography purposes. The sniffer proved to be useful for off-line analysis of the EEG and also for on-line applications, as Brain Computer-Interfaces (BCIs). Despite its limitations and packet losses at around 1.7% due to noise, the off-line analysis of the EEG successfully replicated results of the literature regarding the Event-Related (De)Synchronization (ERD/ERS) and Evoked Potentials (EPs) calculated for mental tasks. For on-line applications the sniffer was used to program a single-switch BCI for on-line classification of motor and no motor mental tasks with high success rate. Nowadays, the BrainNet36 ® device is being used for EEG research at many Brazilian universities, therefore, we hope that this article may encourage on-line applications. Finally, as the sniffer operation is explained here with examples, this text may serve as a reference guide for potential user's.

关键词： Electroencephalography Electrodes Educational institutions Noise Scalp Protocols MATLAB

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Characterization of contacts degradation in circuit breakers through the dynamic contact resistance

Characterization of contacts degradation in circuit breakers...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： R. T. de Souza E. G. da Costa A. C. de Oliveira W. de V. Sousa T. C. M. de Morais Industry Academic Unit Paraiba Federal Institute Brazil Department of Electrical Engineering Campina Grande Federal University Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE - DEE Campina Grande Federal University Brazil Encrgisa Paraiba Brazil

Static resistance measurement of circuit breakers has been a crucial technique to assess the state of contacts, supporting maintenance procedures. However, in many cases, the obtained results do not provide accurate data for correct diagnosis, since the test examines only the main contact. This article discusses the application of the contact dynamic resistance measurement (DRM) in the evaluation of main and arcing contacts. The DRM is a contact resistance test, and the resistance is determined during the opening of contacts, analyzing the main and arcing contacts. The research objective is to get the DRM parameters that can assist in the contacts diagnosis. The obtained results indicate that DRM has presented more qualitative parameters than the static resistance test in the evaluation of contacts. The resistance tests were performed applying a direct current with 300 A of ***.

关键词： Resistance Circuit breakers electrical resistance measurement Current measurement Voltage measurement Contacts Oscilloscopes

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Open-end multi-level six-phase machine drive system with three three-phase DC-link converters

Open-end multi-level six-phase machine drive system with thr...

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Annual Conference of Industrial Electronics Society

作者： A. C. N. Maia C. B. Jacobina N. B. Freitas Post-Graduate Program in Electrical Engineering – PPgEE Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Federal Institute of Alagoas (IFAL) Palmeira dos Indios AL Brazil

A novel multi-level AC six-phase motor drive is developed in this paper. The scheme is based on three conventional 2-level three-phase voltage source inverters (VSIs) supplying the open-end windings of a dual three-phase motor (six-phase induction machine). The proposed inverter is capable of supply the machine with multi-level voltage waveforms. The developed system is compared with the conventional solution and it is demonstrated that the drive system permits to reduce the harmonic distortion of the machine currents, to reduce the total semiconductor losses and to decrease the power processed by converter switches. The system model and the Pulse-Width Modulation (PWM) strategy are presented. The experimental verification was obtained by using IGBTs with dedicated drives and a digital signal processor (DSP) with plug-in boards and sensors.

关键词： Topology Inverters Pulse width modulation Harmonic distortion Switching loss Motor drives Switching frequency

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One and Two Dc-Links Universal Active Power Filter Without Series Isolation Transformer

One and Two Dc-Links Universal Active Power Filter Without S...

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IEEE Energy Conversion Congress and Exposition

作者： P. L. S. Rodrigues C. B. Jacobina G. A. de A. Carlos M. B. R. Correa M. A. Vitorino Post-Graduate Program in Electrical Engineering - PPgEE - Copele Federal University of Campina Grande (UFCG) Campina Grande - 58429-900 - Paraiba - Brazil Department of Electrical Engineering Federal University of Campina Grande (UFCG) Campina Grande - 58429-900 - Paraiba - Brazil

ISBN: (纸本)9781479957774

This paper presents two universal active power filter (UAPF) configurations for reactive power and harmonic compensation without series isolation transformer. The proposed systems combine both series and shunt compensation, by using converters with one (configuration I) or two (configuration II) dc-links. They are suitable for applications in which size, weight and cost associated with transformers becomes a critical issue. The PWM techniques and complete control of the systems are developed. Simulation and experimental results are shown for validation purposes.

关键词： isolation transformer active power filter power filters shunt compensation harmonic compensation series (mathematics) Reactive power Transformer Converters Universal

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Hybrid Open-End and NPC AC Six-Phase Machine Drive Systems

Hybrid Open-End and NPC AC Six-Phase Machine Drive Systems

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IEEE Energy Conversion Congress and Exposition

作者： Victor F. M. B. Melo Cursino B. Jacobina Nady Rocha Post-Graduate Program in Electrical Engineering - PPgEE - COPELE - UFCG Campina Grande Paraiba Brazil Electrical Engineering Department - Federal University of Campina Grande - UFCG Campina Grande Paraiba Brazil Federal University of Paraiba - UFPB Joao Pessoa Paraiba Brazil

ISBN: (纸本)9781479957774

This paper presents two machine drive system based on a six-phase machine (SPM) and three-leg converters. The machine is composed of two three-phase groups. For the first configuration, one of the groups is connected to a three-leg converter and the other is connected to other two three-leg converters in an open-end winding configuration (see Fig. 4). For the second configuration, one of the groups is connected to a three-leg converter (similar to first one) and the other group is connected to a three-level NPC converter (see Fig. 5). Since the machine two groups are fed differently, the system topology is considered to be hybrid. The purpose of these topologies is to be an alternative configuration, being midway between the conventional six-leg inverter system (see Fig. 1) and the NPC six-leg inverter system (see Fig. 2) and Conventional twelve-leg Open-end inverter system (see Fig. 3). Compared with the conventional six-leg system, the proposed systems permits reducing the power processed by the semiconductor switches and their ratings, the dc-link voltage and the harmonic distortion. On the other hand, the proposed systems constitute less complex alternatives, compared with the open-end and NPC counterparts (see Fig. 3). PWM and control strategies are discussed. Simulation and experimental results are also presented.

关键词： drive train Figs Thyristors Converters machine six-phase Midway Inventors Harmonic distortion

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