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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Monteiro, Amanda P. Jacobina, Cursino B. Bahia, Filipe A. C. Sousa, Reuben P. R. Post-Graduate Program in Electrical Engineering PPgEE/COPELE Campina Grande Paraíba58429-900 Brazil Salvador Bahia40210-630 Brazil

ISBN: (纸本)9781728158266

In this paper, dual Vienna rectifiers are proposed for Wind Energy Conversion System (WECS) applications with Open-End Winding (OEW) Permanent Magnet Synchronous Generator (PMSG). Due to the reduced number of controlled switches, the proposed topologies have reduced costs and high reliability. Besides, they provide a better power quality using the same number of controlled switches than conventional structures presented in the literature, making them very attractive options for industry applications. The system model, space vector modulation, and control strategy are given. Simulation results are provided in order to validate their performance and feasibility. © 2020 IEEE.

关键词： Vector spaces

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Hierarchical modeling of nano-oscillator systems 16

Hierarchical modeling of nano-oscillator systems

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16th International Workshop on Cellular Nanoscale Networks and Their Applications, CNNA 2018

作者： Hull, Zachary Chiarulli, Donald Computer Engineering Graduate Program University of Pittsburgh PittsburghPA15261 United States Electrical and Computer Engineering University of Pittsburgh PittsburghPA15261 United States

ISBN: (纸本)9783800747665

This paper describes our effort to build a set of models for nano-oscillator systems that is compatible with modern EDA design tools. We have implemented a set of hierarchical models that spans an abstraction hierarchy patterned after CMOS design and includes device, circuit and system level models. The device models are based on empirical data sampled from hardware and the circuit and system models were verified against SPICE, MATLAB and C++. To date, we have built models for Spin Torque Oscillator (STO) based systems and Vanadium Dioxide (VO2) devices based on relaxation oscillator clusters. For space limitations, the examples shown here are based on the VO2 case. © VDE VERLAG GMBH.

关键词： Vanadium dioxide

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Development of teaching materials for improving motivation to learn electromagnetics using ict

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IEEJ Transactions on Fundamentals and Materials 2020年第4期140卷 171-178页

作者： Ohtaki, Yu Ohchi, Masashi Master's Program in Electrical Electronics and Computer Engineering Graduate School of Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Narashino275-0016 Japan Department of Electrical and Electronic Engineering Faculty of Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Narashino275-0016 Japan

In this research, we have been developed teaching materials for electromagnetics that demonstrate theories using real-world actual applications (capacitors, coils, piezoelectric elements, Wireless Power Transfer(WPT), WiFi, direct-current motor, etc.) presented as animations and video data via Web services. Hypertext Markup Language (HTML) and JavaScript were used to create the Web services for teaching materials. Recently, the lack of academic ability of Japanese engineering course students has become a large social problem at Japanese higher education. In particular, in the field of electrical engineering education, the visualization and mathematical abilities of students have been declining remarkably. In addition, today's teaching materials for educational institutions in Japan tend to reply primarily on rote learning. However, we consider that rote learning is not the primary method for university education. We tested our new developed materials on students learning motivation of electromagnetics and evaluated their effectiveness with some questionnaires. It was clear that the new teaching method has effectiveness for increasing learning motivation of Electromagnetics. © 2020 The Institute of electrical Engineers of Japan.

关键词： Web services

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Study on estimating electric potential in space between parallel electrodes

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IEEJ Transactions on Fundamentals and Materials 2018年第8期138卷 400-407页

作者： Tsujita, Atsushi Ohchi, Masashi Wakimoto, Takayuki Master's Program in Electrical Electronics and Computer Engineering Graduate School of Engineering Chiba Institute of Technology 2-17-1 Tudanuma Narashino275-0016 Japan Department of Electrical and Electronic Engineering Faculty of Engineering Chiba Institute of Technology 2-17-1 Tudanuma Narashino275-0016 Japan

We have been studying on estimating distribution of permittivity between measurement electrodes using capacitance and electric potential. Two arc electrodes were separated by long distance and there electrodes were surrounded by additional electrodes respectively. In past research work, we carried out numerical electric analysis for calculating the capacitance and electric potential using Finite Element Method(FEM) and compared with experimental and numerical results. The capacitance values were almost agree with experimental and numerical results. However, the electric potential values were different between experimental and numerical results in conventional studies. In this paper, we proposed an equivalent circuit including the stray capacity and measurement method for capacitance, the electric potential in space between long distance electrodes was estimeded. © 2018 The Institute of electrical Engineers of Japan.

关键词： Electric potential

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Evolutionary computation and swarm intelligence for the inference of gene regulatory networks

Evolutionary computation and swarm intelligence for the infe...

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作者： Hattori, Leandro Takeshi Lopes, Heitor Silvério Lopes, Fabrício Martins Graduate Program in Electrical and Computer Engineering Federal University of Technology ParanáCuritiba Brazil Graduate Program in Bioinformatics Federal University of Technology ParanáCornélio Procópio Brazil

The inference of gene regulatory networks (GRNs) from expression profiles is still an important challenge in bioinformatics research. The main difficulty of this problem is associated to the huge number of genes and the small number of samples available, as well as the intrinsic noise in the data acquisition process. In this context, this paper presents a feature selection approach to the identification of GRNs using optimisation strategies from evolutionary computation and swarm intelligence. As a case-study we used an artificial gene network (AGN) based on the scale-free topology. This AGN has 1,000 genes and was simulated with 500 temporal expression samples. The methods compared were: differential evolution (DE), bat algorithm (BAT) and artificial bee colony (ABC) algorithms. All algorithms used their standard control parameters and the same criterion function: the mean conditional entropy (MCE). This is an information theory measure, commonly adopted for various feature selection problems in the pattern recognition research field. The results showed that DE algorithm leaded to the best results than BAT and ABC in all comparisons, and the inferred network was more similar to the original network. Copyright © 2016 Inderscience Enterprises Ltd.

关键词： Evolutionary algorithms

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Numerical electric field analysis of capacitance and potential in space for estimation of permittivity distribution

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IEEJ Transactions on Fundamentals and Materials 2018年第4期138卷 119-126页

作者： Yamanobe, Hiroshi Ohchi, Masashi Master's Program in Electrical Electronics and Computer Engineering Graduate School of Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Narashino275-0016 Japan Department of Electrical and Electronic Engineering Faculty of Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Narashino275-0016 Japan

We have been studying on measuring capacitance and potential using long distance electrode for estimating a permittivity distribution. The estimating method of permittivity distribution was proposed using Finite Element Method (FEM) and Genetic Algorithm (GA). However, the measurement accuracy was not reviewed. In this paper, we carried out numerical analysis using FEM in case of change of diameter, position and permittivity of a rod of dielectric and discussed the measurement accuracy of capacitance and potential. © 2018 The Institute of electrical Engineers of Japan.

关键词： Finite element method

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Requirements specification and evaluation for transient faults in communication protocols based on RT-FRIDA framework

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IFAC-PapersOnLine 2018年第10期51卷 76-81页

作者： Roque, Alexandre S. Nunes, Gerson L. Freitas, Edison P. Pereira, Carlos E. Graduate Program in Electrical Engineering Federal University of Rio Grande do Sul UFRGS Porto Alegre Brazil Computer Science and Engineering Department Regional Integrated University of High Uruguay and Missions URI Santo Angelo Brazil

This paper presents an evaluation of requirements specification for two critical real-time control systems, which depends of industrial communications protocols. It is proposed the use of aspect-oriented modeling (AOM) to map transient fault behaviors in design phases, with RT-FRIDA framework extended for fault modeling capabilities. Requirements specification for an Active suspension control system and for a fault detection control system applied in agricultural implements was made as case study. Faults are specified as non-functional requirements and evaluated applying a quantitative softgoal weight method. Results presented indicates aspect-oriented fault modeling as an important ally to specify faults that have potential to degrade performance of real-time control systems. © 2016

关键词： Suspensions (components) Active suspension systems Agricultural implements Control systems Fault detection Fault tree analysis Interactive computer systems Network protocols Real time control Real time systems Specifications Active suspension control Aspect oriented Aspect Oriented Modeling Industrial communications Non functional requirements Requirements analysis Requirements specifications Transient faults

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The modeling of 80 mm diameter cross flow turbine runner for mini/microhydro environmentally friendly power plant 8

The modeling of 80 mm diameter cross flow turbine runner for...

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8th International Seminar on New Paradigm and Innovation on Natural Sciences and Its Application, ISNPINSA 2018

作者： Purwanto Budiyono Hermawan Diponegoro University Post Graduate Program Semarang Indonesia Vocational School Diponegoro University Semarang Indonesia Electrical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia

Indonesian river's potentials on Mini or Microhydro fuelled power plants has not been maximally explored despite its big potentials of utilization. The 500 MW energy potentials of Mini or Microhydro throughout Indonesia have only reached the point of 4.5% while National Energy Management Blueprint in 2050 targeted 31% of renewable energy (RE) is coming from Micro hydro energy. The applications of 80 mm diameter cross flow turbine in a household scale have drawn an increase in its experience with 450 Watts of power produced through small discharge of 20 liters/second and 3-meter head. Cross flow turbines testing in 130 mm length and 80 mm diameter conducted using Mini/micro hydropower Plant in environmentally friendly power House drum. Lower investment and operational design cost also to be made on its aim to reach community group or individual segments. © Published under licence by IOP Publishing Ltd.

关键词： Investments

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Metasurfaces for next-generation wireless communication systems

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National Science Review 2023年第8期10卷 17-19页

作者： Younes Ra'di Nikita Nefedkin Petar Popovski Andrea Alù Department of Electrical Engineering and Computer Science Syracuse University Photonics Initiative Advanced Science Research Center City University of New York Department of Electronic Systems Aalborg University Physics Program Graduate Center City University of New York

The pace of development in the world of 5G communication systems has proven to be much more demanding than previous generations, with 5G-Advanced seemingly around the corner [1]. Extensive research is already underway to structure the next generation of wireless systems(i.e. 6G), which may potentially enable an unprecedented level of human–machine interaction [2].

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Effective Loss Function for Unbalanced Breast Thermal Image Segmentation

Effective Loss Function for Unbalanced Breast Thermal Image ...

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2021 International Conference on computer System, Information Technology, and electrical engineering, COSITE 2021

作者： Roslidar, Roslidar Saddami, Khairun Irhamsyah, Muhammad Arnia, Fitri Syukri, Maimun Munadi, Khairul Universitas Syiah Kuala Doctoral Program Post Graduate Program School of Engineering Banda Aceh23111 Indonesia Universitas Syiah Kuala Department of Electrical and Computer Engineering Banda Aceh23111 Indonesia Universitas Syiah Kuala Medical Faculty Banda Aceh23111 Indonesia

ISBN: (纸本)9781665425094

The convolutional neural network's ability to learn images has reigned in computer vision tasks of object detection, classification, and segmentation. In segmentation, the CNN architectures of U-Net and SegNet have shown a good performance;thus, we implemented these networks to take the region of interest (ROI) of the breast thermal images from database for mastology research (DMR). We fine-tuned the networks to find the optimal hyperparameter that can result in the best learning performance. The networks were trained using the stochastic gradient descent optimization algorithm, and weights were updated using the error backpropagation of the algorithm. To minimize the error, the loss function is applied to evaluate a candidate solution of the weights. Thus, we conducted a preliminary study on finding the optimal loss function for breast thermal image segmentation. We applied loss functions of cross-entropy, dice, and focal and figured out the one that provides the highest segmentation accuracy. Then, to evaluate the segmentation result, we calculated the pixel accuracy rate and the dice coefficient to obtain the overlapping index measuring the overlay area between ground truth and predicted output. The result shows that the SegNet model with cross-entropy loss function can take the ROI of breast thermal images at the highest pixel accuracy and optimum dice coefficient of 0.8845 and 0.7928, respectively. © 2021 IEEE.

关键词： Image segmentation

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