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检索条件"机构=Post-Graduate Program in Electrical Engineering"

共 246 条记录，以下是91-100 订阅

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Archimedean spiral multi-resonator for chipless RFID tag using Frequency-Coded Decimal method

Archimedean spiral multi-resonator for chipless RFID tag usi...

引用

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

作者： Ferreira, Hillner De P. A. Serres, Alexandre J. R. Serres, Georgina Karla De F. De Assis, Francisco M. Neto, Alfrêdo Gomes Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil Group of Telecom. and Applied Electromagnetism Federal Inst. of Educ. Science and Technology of Paraíba João Pessoa Brazil

ISBN: (纸本)9781467394925

A compact electromagnetic multi-resonator is presented in this paper using a new technique for chipless RFID tag data encoding. Employing Archimedean spirals, the information is applied into the spectral signature shifting resonant frequencies in several positions. The multi-resonator tag proposed operates in microwave band (between 3.0-7.0GHz) and has a coding data capacity of up to 100 decimal numbers for two resonant frequencies. The simulated and measured results show a good concordance and a great perspective to use in low-cost RFID chipless tag applications. © 2015 IEEE.

关键词： Radio frequency identification (RFID)

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Methodology for analysis of stress level based on asymmetry patterns of alpha rhythms in EEG signals

Methodology for analysis of stress level based on asymmetry ...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Alexandre Geraldo Pomer-Escher Maria Dolores Pinheiro de Souza Teodiano Freire Bastos Filho Post-Graduate Program in Biotechnology Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program in Electrical Engineering Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program in Psychology Federal University of Espirito Santo Av Fernando Ferrari 514 Vitoria Brazil

Stress can affect all people, regardless of age, gender or ethnicity. The human body uses stress as an adaptive response against several situations, but it can cause physical, mental or emotional distress. In stress situation the nervous system evokes the same physiological responses, whatever the type of stress and these responses cause changes in the physical, cognitive, emotional and social performance. This paper proposes to develop a methodology for analyzing the stress level using electroencephalographic signals (EEG) based on asymmetry patterns of alpha waves. The subjects of this research are professionals from Vitoria's Fire Department. Activities of the Central Nervous System are capture using Emotiv Epoc Headset, placed on the volunteer's scalp. The signals are analyzed from the frontal cortex at positions Fp1 (AF3), Fp2 (AF4), F3 and F4, according to of the international 10-20 system. The results are analyzed together with some peripheral physiological signals, such as: heart beat rate (ECG), peripheral blood flow, skin conductance, breath rate, body temperature and change in level of salivary cortisone. In addition, a psychological assessment of voluntary's stress is performed through a questionnaire of LIPP-ISS (Inventory of Symptom Stress). A validation study is conducted through a comparison with data available in literature, as well as with evaluation conducted by a psychologist. The results are analyzed in order to get a correlation between EEG signals and physical, mental or emotional stress.

关键词： Electroencephalography Stress Psychology Physiology Temperature sensors Skin Temperature measurement

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Fuzzy set theory based emergency control for power distribution systems

Fuzzy set theory based emergency control for power distribut...

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IEEE Power engineering Society Winter Meeting, 2000

作者： Cavati, C.R. Ferreira, E.P. Ekel, P.Ya. Federal University of Espirito Santo Department of Electrical Engineering Av. Fernando Ferrari S/N VitóriaES29060-970 Brazil Pontificia Catholic University of Minas Gerais Post Graduate Program in Electrical Engineering Av. Dom Jose Gaspar 500 Belo HorizonteMG30535-610 Brazil

ISBN: (纸本)0780359356

This work presents results of research related to an emergency control for distribution systems. The problem is formulated within the framework of a fuzzy transportation network problem. An effective fuzzy integer programming model is proposed with solution based on satisfaction of operational levels. The proposed methodology has been applied to a realistic power distribution system based on a primary distribution network. The results demonstrate that the approach provides not only the convincing satisfaction of the actual requirements of the power distribution system, but also offers more information to the decision maker to improve decision making quality. © 2000 IEEE.

关键词： Fuzzy set theory

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Comparison between wire and wireless EEG acquisition systems based on SSVEP in an Independent-BCI

Comparison between wire and wireless EEG acquisition systems...

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

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) Brazil

This paper presents a comparison between two different technologies of acquisition systems (BrainNet36 and Emotiv Epoc) for an Independent-BCI based on Steady-State Visual Evoked Potential (SSVEP). Two stimuli separat... 详细信息

关键词： Visualization Electrodes Indexes Accuracy Brain-computer interfaces Synchronization Feature extraction

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Quality Improvements in the electrical Design of Typical DC-DC Electronic Power Converter for High-Voltage Applications 8

Quality Improvements in the Electrical Design of Typical DC-...

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8th International Conference on engineering and Emerging Technologies, ICEET 2022

作者： Recto, King Harold A. Escoto, Miguel T. Hernandez, Noel B. Ateneo de Manila University Department of Electronics Computer and Communications Engineering Quezon City Philippines Electrical and Electronics Engineering Institute University of the Philippines Diliman Quezon City Philippines Centro Escolar University Post-doctoral Program in Quality Management of the Graduate School Manila Philippines

ISBN: (纸本)9781665491068

The green transition has brought about a worldwide-shift to the use of renewables as alternative energy sources. Because of this, high voltage DC has been a field of interest in power electronics due to its capability in efficiently transmitting power to reach remote areas. Typical DC-DC electronic power converter design has the capability of boosting voltage level to a certain extent but not enough for high-voltage applications. Using the DMAIC Approach of the Six Sigma, quality improvements in the design was proposed to stabilize operating frequency, bring up the output voltage from 100 VDC to 4,000 VDC and provide at least 10% margin of error in the apparent power measured at the output side to offset inherent losses in the electrical design. These proposed quality improvements were sustained by designing a control circuit that would ensure the attainment of the parameters set in the Define Phase of the DMAIC Approach. The result of the study is a practical 12 VDC to 4,000 VDC boost converter design that has incorporated all the proposed quality improvements. © 2022 IEEE.

关键词： Six sigma

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Realizing and Experimentally Testing a Reluctance-Based Magnetic Lead Screw

Realizing and Experimentally Testing a Reluctance-Based Magn...

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International Symposium on Electromagnetic Fields in Mechatronics, electrical and Electronic engineering (ISEF) Book of Abstracts

作者： Mateus Cirolini Aly Ferreira Flores Filho Paulo Roberto Eckert Lucas Dalla Corte Franchi Post-Graduate Program in Electrical Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil

ISBN: (数字)9781728115603

ISBN: (纸本)9781728115610

This paper presents the realization and the experimental tests of a new type of reluctance-based magnetic lead screw (RBMLS) that is attractive for many potential applications. The proposed topology presents structure simplification with the implementation of discretized permanent magnets (PM) and ferromagnetic semi-rings. The proposed RBMLS has PMs only in one of its movable parts, making it suitable for long-stroke applications. The dynamic experimental results for the realized prototype are going to be compared to the 3-D finite-element method (FEM) outcomes. Experimental static results have already been obtained and show good agreement.

关键词： Fasteners Lead Rotors Topology Magnetic resonance imaging Force Magnetic flux

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Real Time Chest X-Ray Interpretation Applying Vision Transformer for Tuberculosis Detection

Real Time Chest X-Ray Interpretation Applying Vision Transfo...

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International Conference on Computer engineering, Network and Intelligent Multimedia (CENIM)

作者： Muhammad Irhamsyah Roslidar Yunidar M. Al Lail Qadrillah Nasaruddin Fitri Arnia Khairul Munadi Post Graduate Program in Engineering Universitas Syiah Kuala Banda Aceh Indonesia Department of Electrical and Computer Engineering Faculty of Engineering Universitas

ISBN: (数字)9798350368802

ISBN: (纸本)9798350368819

Tuberculosis (TB) is an infectious disease that can attack the lungs and other organs. In the diagnosis of TB, the interpretation of X-ray radiological images requires special skills from medical specialists. However, the lack of experience of medical personnel and focus on X-ray examinations can be a challenge for radiologists because it has the potential to cause diagnostic errors in image interpretation. Therefore, we proposed a web-based application of real-time chest X-ray interpreter by integrating the deep learning model of Vision Transformer (ViT) to interpret chest X-ray images. The inference model was trained and tested on 652 normal and 652 tuberculosis X-ray images. The data preprocessing of Contrast Adaptive Histogram Equalization (CLAHE) was implemented to increase chest X-ray image contrast as well as inference model performance. The proposed real time system can inteprete the tested chest x-ray images with an accuracy of 95% and with simulation duration time of 4.7 seconds.

关键词： Adaptation models Computer vision Accuracy Sensitivity Tuberculosis Data preprocessing Transformers Real-time systems X-ray imaging Medical diagnostic imaging

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Direct Torque Control Scheme for a Nine-Phase Induction Motor With Reduced Current Harmonic

Direct Torque Control Scheme for a Nine-Phase Induction Moto...

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Brazilian Power Electronics Conference, COBEP

作者： Gilielson F. da Paz Isaac S. de Freitas Victor F. M. B. Melo Alexandre G. F. da Silva Post-Graduate Program in Electrical Engineering - PPgEE UFPB Federal University of Paraíba Paraíba Brazil

ISBN: (数字)9781728141800

ISBN: (纸本)9781728141817

This paper discusses a modified Direct Torque Control (DTC) method in order to reduce phase current harmonic distortion in a nine-phase asymmetrical induction motor drive system. Since the classical DTC is a direct adaptation from the three-phase case, it does not take into account the presence of the non-producing torque current components obtained from the Space Vector Decomposition (SVD) technique. Thus, in classical DTC these non-producing torque components assume high amplitudes, causing distortion in phase currents. In this way, it is shown that modified DTC minimizes the undesired components, reducing significantly the distortion in phase currents while maintaining the fast dynamic response of classical DTC.

关键词： Torque Stators Switches Harmonic distortion Rotors Torque control

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A fast space-vector algorithm for common-mode voltage elimination in multilevel converters

A fast space-vector algorithm for common-mode voltage elimin...

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Brazilian Power Electronics Conference, COBEP

作者： Luis G. G. P. de Castro Maurício B. R. Corrêa Cursino B. Jacobina Post-Graduate Program in Electrical Engineering - PPgEE- COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande Campina Grande PB Brazil

This paper presents an approach that allows to apply space-vector modulation strategy to eliminate common-mode voltage in multilevel inverters. The strategy is based on the reduction of the space vector diagram and on the choice of switching states in which the common-mode voltage is zero. Results were obtained with a real-time simulator and an experimental platform of a cascaded inverter up to 11-level shows its effectiveness. The influence of dead-time over the algorithm performance is investigated too.

关键词： Inverters Vectors Switches Modulation Equations Mathematical model Switching frequency

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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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