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Measurement of capacitance and electrical potential of plural points for estimation of permittivity distribution

IEEJ Transactions on Fundamentals and Materials 2013年第4期133卷 173-179+5页

作者： Okada, Shota Ohchi, Masashi Furukawa, Tatsuya Itoh, Hideaki Fukumoto, Hisao Master's Program in Electrical Graduate School of Engineering Chiba Institute of Technology 2-17-1 Tudanuma Narashino 275-0016 Japan Department of Electrical Electronics and Computer Engineering Faculty of Engineering Chiba Institute of Technology 2-17-1 Tudanuma Narashino 275-0016 Japan Graduate School of Science and Engineering Saga University 1 Honjo-machi Saga 840-8502 Japan

Recently, a method for estimating permittivity distributions was reported. The method combined a numerical technique (Finite Element Method) with Genetic Algorithm (GA). However, methods for estimating the distribution of permittivity have not yet been established. The purpose of this study is to obtain experimental data in order to improve the estimation method. We measured capacitance and electrical potential of plural points when an acrylic rod is placed in various positions within a measurement system. © 2013 The Institute of electrical Engineers of Japan.

关键词： Capacitance

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A portable and low cost solution for EMG using ZigBee, GPRS and Internet to Biomedical applications

A portable and low cost solution for EMG using ZigBee, GPRS ...

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19th IMEKO TC4 Symposium - Measurements of electrical Quantities 2013 and 17th International Workshop on ADC and DAC Modelling and Testing

作者： Silva, D.K.N. Sato, R.M.V. Castro, A.L.S. Electrical Engineering Post Graduate Program Av. Augusto Correa 01 66075-110 Belém - Pará Brazil Faculty of Computer and Telecommunication Engineering Av. Augusto Correa 01 66075-110 Belém - Pará Brazil

ISBN: (纸本)9781629931890

This paper presents a prototype of an acquisition board of electromyographic signals (EMG);an embedded portable, wireless and low cost solution. The system is composed of an EMG acquisition board, Zigbee modules and a device named GPRSx. After acquiring the EMG signal, it is sent through ZigBee wireless technology to GPRSx device. The GPRSx device sends the EMG signal to a server on the Internet by using GPRS wireless technology. Thus, the EMG signal is displayed in a graph on a remote computer. The results are very promising and may serve as a reference in studies for the biomedical area.

关键词： Costs

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Analysis and design of an embedded system to aid the navigation of the visually impaired

Analysis and design of an embedded system to aid the navigat...

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2013 4th ISSNIP-IEEE Biosignals and Biorobotics Conference: Biosignals and Robotics for Better and Safer Living, BRC 2013

作者： Guimaraes, Carlos Solon S. Bayan Henriques, Renato V. Pereira, Carlos Eduardo Post Graduate Program in Electrical Engineering - PGPEE Federal University of Rio Grande Do sui - UFRGS Avenue Osvaldo Aranha 103 Porto Alegre RS Brazil

ISBN: (纸本)9781467330244

This article aims to present the methodologies of development, analysis and system design of an Electronic Bengal, with object-oriented and structured methods, trying to establish the main features of these. From this scenario, several methods of system analysis are available for use. Among the studies conducted to develop the system, using automation techniques, are SART (Structured Analysis Real-Time) and UML (Unified Modeling Language) modelings. Each has its peculiarities, both in the way of diagramming and about the script. The project proposes an electronic device with an embedded system that contains a control algorithm to enable vibration and audio electromechanical transducers. The project is an electronic device based on open-source flexible platforms to assist in the orientation and mobility of the visually impaired during their displacement. © 2013 IEEE.

关键词： Embedded systems

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A heuristic fuzzy algorithm bio-inspired by Evolution Strategies for energy forecasting problems

A heuristic fuzzy algorithm bio-inspired by Evolution Strate...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Vitor N. Coelho Frederico G. Guimarães Agnaldo J. R. Reis Igor M. Coelho Bruno N. Coelho Marcone J. F. Souza Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Departament of Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Control Engineering and Automation Universidade Federal de Ouro Preto Ouro Preto MG Brazil Institute of Computing Universidade Federal Fluminense Niteri RJ Brazil Department of Computer Science Universidade Federal de Ouro Preto Ouro Preto MG Brazil

Improving the use of energy resources has been a great challenge in the last years. A new complex scenario involving a decentralized bidirectional communication between energy suppliers, distribution system and consumption is nowadays becoming reality. Sometimes cited as the largest and most complex machine ever built, Electric Grids (EG) are been transformed into Smart Grids (SG). Hence, the load forecasting problem has become more difficulty and more autonomous load predictors are needed in this new conjecture. In this paper a novel method, so-called MSES, bio-inspired by Evolution Strategies (ES) combined with Multi-Start (MS) procedure is described. This procedure is mainly based on a self-adaptive algorithm to calibrate the parameters of the fuzzy rules. MSES was implemented in C++ via OptFrame framework. Our main goal is to evaluate the performance of this algorithm in a grid environment. Real data from an electric utility have been used in order to test the proposed methodology. The obtained results are fully described and analyzed.

关键词： Forecasting Vectors Prediction algorithms Predictive models Training Standards Adaptation models

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AC-DC-AC nine-phase machine drive system based on H-bridges and three-leg converters

AC-DC-AC nine-phase machine drive system based on H-bridges ...

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Annual Conference of Industrial Electronics Society

作者： Victor F. M. B. Melo Cursino B. Jacobina Edgar R. Braga-Filho Rodolpho M. Cavalcanti Isaac S. de Freitas Roberto S. Macena Gregory A. de A. Carlos Post-Graduate Program in Electrical Engineering PPgEE - COPELE - UFCG Federal University of Campina Grande UFCG Campina Grande Paraíba Brazil Federal University of Paraiba UFPB Joao Pessoa Paraíba Brazil Federal Institute of Technology of Sergipe IFSE Estancia Sergipe Brazil Universidade Federal de Campina Grande Campina Grande PB BR

This paper presents an ac-dc-ac reversible nine-phase machine drive system. The grid side converter is composed of Y-connected single-phase bridges. As the machine is composed of three three-phase groups, a three-leg converters are connected separately to each group. The topology does not make use of input isolation transformers and reduces the power processed by converter switches when compared to that of conventional two-level converter. Moreover, harmonic distortion in voltages generated by the grid side converter is reduced when compared to conventional two-level converter. The model and the control strategy have been developed. Simulation and experimental results are also presented.

关键词： Inverters Topology Harmonic distortion Pulse width modulation Voltage control Rotors Capacitors

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Proposal of methodology for analysis of stress level based on EEG signals

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BMC Proceedings 2014年第4期8卷 1-1页

作者： Alexandre Pomer-Escher Teodiano Bastos-Filho Maria Dolores Souza Post-Graduate Program in Biotechnology Federal University of Espirito Santo Vitoria Espirito Santo 29650000 Brazil Post-Graduate Program in Electrical Engineering Federal University of Espirito Santo Vitória spirito Santo 29075910 Brazil Post-Graduate Program in Psychology Federal University of Espirito Santo Vitória Espirito Santo 29075910 Brazil

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A technique to package fiber bragg grating sensors for strain and temperature measurements

A technique to package fiber bragg grating sensors for strai...

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作者： Dreyer, Uilian De Morais Sousa, Kleiton Somenzi, Jonas De Lourenço Junior, Ivo Da Silva, Jean Carlos Cardozo De Oliveira, Valmir Kalinowski, Hypolito José Electrical Engineering Graduated Program-PPGEE Federal University of Technology-Paraná Pato Branco 85503-390 Brazil Graduate Program on Electrical Engineering and Applied Computer Science-CPGEI Federal University of Technology-Paraná Curitiba ZIP 80230-901 Brazil

This paper reports an effective method of packaging a fiber Bragg grating (FBG) for the simultaneous measurement of temperature and strain. The technique consists of embedding two fiber Bragg grating sensors inside a polymeric material with different geometrical characteristics. The mechanical and thermal characterizations of the optical transducer were performed. Then a matrix equation used measurements of the wavelength shifts from the two sensors and yielded information about the temperature and strain coefficients. The preliminary results demonstrate the feasibility of the encapsulation technique allowing measurements of temperature and strain in smart structures and harsh environments. The experimental procedure provides robustness to the sensor and the matrix equation approach has the potential to determine simultaneously the strain and temperature coefficients. © 2013 SBMO/SBMag.

关键词： Fiber Bragg gratings

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Towards bio-inspired place recognition over multiple spatial scales

Towards bio-inspired place recognition over multiple spatial...

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2013 Australasian Conference on Robotics and Automation, ACRA 2013

作者： Chen, Zetao Jacobson, Adam Erdem, Uʇur M. Hasselmo, Michael E. Milford, Michael School of Electrical Engineering and Computer Science Queensland University of Technology Australia Center for Memory and Brain and Graduate Program for Neuroscience Boston University United States

ISBN: (纸本)9780980740448

This paper presents a new multi-scale place recognition system inspired by the recent discovery of overlapping, multi-scale spatial maps stored in the rodent brain. By training a set of Support Vector Machines to recognize places at varying levels of spatial specificity, we are able to validate spatially specific place recognition hypotheses against broader place recognition hypotheses without sacrificing localization accuracy. We evaluate the system in a range of experiments using cameras mounted on a motorbike and a human in two different environments. At 100% precision, the multiscale approach results in a 56% average improvement in recall rate across both datasets. We analyse the results and then discuss future work that may lead to improvements in both robotic mapping and our understanding of sensory processing and encoding in the mammalian brain.

关键词： Brain mapping

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Dynamic selection of migration flows in island model differential evolution

Dynamic selection of migration flows in island model differe...

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15th Annual Conference on Genetic and Evolutionary Computation, GECCO 2013

作者： Lopes, Rodolfo A. Pedrosa Silva, Rodrigo C. Campelo, Felipe Guimaraes, Frederico G. Graduate Program in Electrical Engineering Federal University of Minas Gerais UFMG Belo Horizonte - MG Brazil Department of Electrical and Computer Engineering Mcgill University Quebec Canada Department of Electrical Engineering Federal University of Minas Gerais UFMG Belo Horizonte - MG Brazil

ISBN: (纸本)9781450319645

In this paper, a new approach to the topology configuration problem in the Island Model (IM) is proposed. The mechanism proposed works with a pool of candidates for migration and the choice of immigrants is performed using the usual selection techniques of evolutionary algorithms. Computational tests on IM versions of the Differential Evolution show positive effects of the proposed approach in terms of the number of function evaluations required for convergence.

关键词： Evolutionary algorithms

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Evaluation of Performance and Stability of an MR Compatible PET Detector

Evaluation of Performance and Stability of an MR Compatible ...

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IEEE Nuclear Science Symposium

作者： Ehsan Shams Jonathan D. Thiessen Daryl Bishop Piotr Kozlowski Fabrice Retiere Muhammad Salman Khan Vesna Sossi Greg Stortz Christopher J. Thompson Andrew L. Goertzen Graduate Program in Biomedical Engineering University of Manitoba Lawson Health Research Institute and the University of Western Ontario Detector Development Group TRIUMF Department of Radiology University of British Columbia Department of Electrical and Computer Engineering University of Manitoba Department of Physics & Astronomy University of British Columbia McConnell Brain Imaging Centre Montreal Neurological Institute Department of Radiology and the Department of Physics & Astronomy University of Manitoba

ISBN: (纸本)9781479960989

We have developed an MR compatible PET insert prototype to enable simultaneous PET-MR imaging of small animals inside a 7T animal MR imaging system. The 16 detectors in this system are based on the SensL SPMArray4B silicon photomultipliers (SiPMs) and dual layer offset LYSO crystal blocks with crystal size of 1.2 × 1.2 × 4 mm~3 in the top layer and 1.2 × 1.2 × 6 mm~3 in the bottom layer, with 409 total crystals per detector. Each detector was evaluated by generating flood histogram images and measuring per-crystal photopeak amplitude and energy resolution. The system was tested for MR compatibility and no visible artefacts were seen in the MR images or in the PET detector flood images. The temperature of the detector modules was monitored and found to stabilize after approximately two hours of operation between 32℃ and 34℃. Photopeak amplitude, energy resolution and count rates recorded per crystal were studied at a baseline temperature of 30℃ and at temperatures ranging from 20℃ to 40℃ in increments of 2℃. When bias voltage to the detectors was fixed at the value corresponding to an overvoltage of 2.5V at 30℃, the photopeak amplitude changed by as much as 19% and 28% at 20℃ and 40℃ respectively. Energy resolution and count rates demonstrated similar degrees of change. Maintaining a fixed overvoltage at each temperature point reduced but did not completely eliminate the change in these output characteristics. A lookup table based on empirical measurements was employed for the adjustment of bias voltage at different temperatures to maximize the stability of detector modules. Measurements obtained by using this lookup table method demonstrate better stability when compared to results obtained by using a fixed overvoltage.

关键词： Detectors Temperature measurement Positron emission tomography Crystals Temperature sensors Voltage control Temperature distribution

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