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Study on estimating electric potential in space between parallel electrodes

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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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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GMD-based hybrid beamforming for large reconfigurable intelligent surface assisted millimeter-wave massive MIMO

arXiv

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arXiv 2020年

作者： Ying, Keke Gao, Zhen Lyu, Shanxiang Wu, Yongpeng Wang, Hua Alouini, Mohamed-Slim Beijing100081 China College of Cyber Security Jinan University Guangzhou510632 China State Key Laboratory of Cryptology P.O.Box 5159 Beijing100878 China Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China School of Information and Electronics Beijing Institute of Technology Beijing100081 China Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal23955 Saudi Arabia

Reconfigurable intelligent surface (RIS) is considered to be an energy-efficient approach to reshape the wireless environment for improved throughput. Its passive feature greatly reduces the energy consumption, which makes RIS a promising technique for enabling the future smart city. Existing beamforming designs for RIS mainly focus on optimizing the spectral efficiency for single carrier systems. To avoid the complicated bit allocation on different spatial domain subchannels in MIMO systems, in this paper, we propose a geometric mean decomposition-based beamforming for RIS-assisted millimeter wave (mmWave) hybrid MIMO systems so that multiple parallel data streams in the spatial domain can be considered to have the same channel gain. Moreover, by exploiting the common angulardomain sparsity of mmWave massive MIMO channels over different subcarriers, a simultaneous orthogonal match pursuit algorithm is utilized to obtain the optimal multiple beams from an oversampling 2D-DFT codebook. Besides, by only leveraging the angle of arrival and angle of departure associated with the line of sight (LoS) channels, we further design the phase shifters for RIS by maximizing the array gain for LoS channel. Simulation results show that the proposed scheme can achieve better BER performance than conventional approaches. Our work is an initial attempt to discuss the broadband hybrid beamforming for RISassisted mmWave hybrid MIMO systems. Copyright © 2020, The Authors. All rights reserved.

关键词： MIMO systems

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Electrochemical parameters of aluminum oxide film in situ during anodization of aluminum by white light-optical interferometry

Electrochemical parameters of aluminum oxide film in situ du...

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Corrosion Conference and Expo 2019

作者： Habib, Khaled Mohammad, Waleed Karim, Farzia Dutta, Joydeep Materials Science and Photo-Electronics Lab RE program EBR Center KIS R P.O.Box 24885 Safat13109 Kuwait Center of Research in Optoelectronics Communication and Control System School of Engineering Bangkok University Pathum Thani12120 Thailand Center of Excellent in Nanotechnology School of Engineering and Technology Asian Institute of Technology Pathum Thani12120 Thailand Functional Materials division KTH Royal Institute of Technology Isafjordsgatan 22 Stockholm Sweden

Both of Fabry-Pérot interferometry and the DC electrochemical method have been simultaneously used for the first time to measure in situ the anodic current density (J) of aluminum oxide films in 0,2,4,5,6,8 and 10% sulfuric acid solutions (H2SO4). The calculated values of J by Fabry-Pérot interferometry were verified by the DC electrochemical method, i.e., a potentiostat, and the AC electrochemical method, i.e., a potentiostat with an accessory of AC impedance spectroscopy (EIS). The corresponding thickness (d) of the aluminum oxide (Al2O3) film to the anodic current density was determined by Fabry-Pérot interferometry under a potentiostatic condition of 9 V with respect to the open circuit potential of the aluminum samples in the H2SO4 solutions, for 90 minutes. Then, the obtained d of the Al2O3 films by Fabry-Pérot interferometry was verified by scanning electron microscopy (SEM) and compared to d values that were obtained by the EIS. The calculated J by Fabry-Pérot interferometry was found in agreement with those of the DC electrochemical method. In contrast, the calculated J by Fabry-Pérot interferometry was found in a 3 fold discrepancy with data obtained by the EIS. © 2019 by NACE International.

关键词： Aluminum oxide

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Corrigendum to “Controlling the crystallinity of HfO 2 thin film using the surface energy-driven phase stabilization and template effect” [Appl. Surf. Sci. 590 (2022) 153082]

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Applied Surface Science 2022年 601卷

作者： Ae Jin Lee Byung Seok Kim Ji Hyeon Hwang Youngjin Kim Hansol Oh YongJoo Park Woojin Jeon Department of Advanced Materials Engineering for Information and Electronics and Integrated Education Program for Frontier Science & Technology (BK21 Four) Kyung Hee University Yongin Gyeonggi 17104 Republic of Korea Advanced Research Development Team SK Trichem Co. Ltd Sejong 30068 Republic of Korea

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A scalable chatbot platform leveraging online community posts: A proof-of-concept study

arXiv

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arXiv 2020年

作者： Jo, Sihyeon Yang, Seung Hee Yoo, Seungryong Zuo, Tong Im, Sangwon Kim, Hee-Eun Han, SangWook Kim, Seong-Woo Electrical & Computer Eng Seoul National University Interdisciplinary Program in Cognitive Science Seoul National University Nuclear Engineering Seoul National University Electronics & Information Eng North China Univ. of Technology Aerospace Engineering Seoul National University Curatorial Team Art Center Nabi Nabi Lab Art Center Nabi Korea Republic of Graduate School of Engineering Practice Seoul National University

The development of natural language processing algorithms and the explosive growth of conversational data are encouraging researches on the human-computer conversation. Still, getting qualified conversational data on a large scale is difficult and expensive. In this paper, we verify the feasibility of constructing a data-driven chatbot with processed online community posts by using them as pseudo-conversational data. We argue that chatbots for various purposes can be built extensively through the pipeline exploiting the common structure of community posts. Our experiment demonstrates that chatbots created along the pipeline can yield the proper responses. Copyright © 2020, The Authors. All rights reserved.

关键词： Pipelines

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A biometric based medical information system for the identification of comorbidity in Covid-19 patients

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AIP Conference Proceedings 2021年第1期2387卷

作者： V. Kumaresan K. Punitha S. Ragupathy B. Priestly Shan T. Gunasekaran 1Department of Electrical and Electronics Engineering Kongu Engineering College Perundurai Tamilnadu India 2School of Computer Science and Engineering Vellore Institute of Technology Chennai Tamil Nadu India 3Department of Electrical and Electronics Engineering SSM College of Engineering Komarapalayam Namakkal Tamil Nadu India 4Professor and Dean - Academic Affairs Chandigarh University Mohali Punjab India 5Program Director - Telecommunications University of Technology and Applied Sciences Higher College of Technology Muscat Sultanate of Oman

Medical information System provides the best way to collect patient’s medical information. It helps the doctors to retrieve the patient’s previous medical history very faster and able to provide suitable treatment quickly. To keep medical information of a patient securely is a difficult task. Many MQTT algorithms have been developed to provide security for the patients information. The sensitive medical information of a patient can also be protected by using biometric technology. Internet of Thing (IoT) technology used to send the medical information to the doctor like blood group, BP value, cholesterol level and heart rate level. The proposed system helps to provide the comorbidity details of the Covid-19 infected patient’s to doctors mobile phone. It also takes the current health details of the patients like temperature, respiratory rate and heart beat rate. By considering the past and present medical data of the Covid-19 patients , this system recommends the type of treatment to be given for Covid-19 infected patients.

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Density functional study on the oxygen evolution reaction mechanism of transition metal doped bimetallic NiCu phosphate surface

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Computational and Theoretical Chemistry 2025年 1250卷

作者： Hamdi Ikhwan Dzaki Ahmad Syaifullah Muhammad Arkan Nuruzzahran Nadhratun Naiim Mobarak Sasfan Arman Wella Fadjar Fathurrahman Ni Luh Wulan Septiani Adhitya Gandaryus Saputro Graduate Program of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Bandung West Java 40132 Indonesia PT. PLN (Persero) Indonesia Department of Chemical Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Darul Ehsan Malaysia Research Center for Quantum Physics National Research and Innovation Agency (BRIN) South Tangerang 15314 Indonesia Collaboration Research Center for Advanced Energy Materials BRIN - Institut Teknologi Bandung Bandung 40132 Indonesia Quantum and Nano Technology Research Group Bandung Institute of Technology Bandung 40132 Indonesia Research Centre for Nanoscience and Nanotechnology Institut Teknologi Bandung Bandung West Java 40132 Indonesia Research Center for Electronics National Research and Innovation Agency KST Samaun Samadikun Bandung 40135 Indonesia

We have explored the oxygen evolution reaction (OER) activity of both undoped nickel copper phosphate (NiCuPO) and transition metal-doped NiCuPO-M (M = Mn, Fe, Co) surfaces using periodic density functional theory (DFT)-based calculations. Our findings highlight that while the undoped NiCuPO surface exhibits a high overpotential of 0.98 V, the introduction of transition metal doping remarkably enhances the OER performance, reducing the overpotential to as low as 0.41 V in the Mn-doped case, outperforming the widely used IrO 2 catalyst. This enhancement is primarily due to a favorable shift in the d -band center, which increases O* adsorption strength and decreases the OER overpotential. Among the doped systems, Mn and Fe doping demonstrate the most substantial reductions in overpotential, underscoring their potential as efficient catalysts for OER applications.

关键词： DFT NiCu phosphate Oxygen evolution reaction Transition metal doping Water electrolysis

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Voltammetry based disposable sensor for antibiotic contamination in food

Voltammetry based disposable sensor for antibiotic contamina...

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Biomedical engineering International Conference (BMEiCON)

作者： Yingyot Poo-arpom Saithip Pakapongpan Pitirat Pholpabu Rungtiva P. Poo-arpom Synchrotron Light Research Institute Nakhon Ratchasima Thailand Thailand Organic and Printed Electronics Innovation Center National Electronics and Computer Technology Center NSTDA Pathum Thani Thailand Biological Engineering Program Faculty of Engineering King Mongkut’s University of Technology Thonburi Bangkok Thailand

This research work reported a highly selective and stable chloramphenicol sensor based on cyclic voltammetry. The sensor was fabricated using graphene-iron oxide nanoparticles modified on a magnetic screen-printed electrode (MSPE). The nanocomposite has remarkable enhancement in large surface areas, facilitates electron transfer to electrode surfaces, and possesses superparamagnetism property. The electrochemical properties were characterized by cyclic voltammetry (CV). The modified electrode provided a fast electron transfer with an apparent electron transfer rate constant (ks) of 0.88 s -1 . The proposed biosensor showed fast CV response (3 s) to chloramphenicol with a wide linear range from 0.05 to 0.5 mM, a low detection limit of 17 μM at a signal to noise ratio of 3 (S/N=3), and good sensitivity (22.788 μA/μM). The resulted biosensor also showed high stability and good reproducibility.

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Need Analysis of Interactive Multimedia Development for Virtual Learning in Pandemic

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Journal of Physics: Conference Series 2021年第1期2111卷

作者： J F Lempas S Soenarto A D Barahama Instructional Technology Post-Graduate Program Universitas Negeri Yogyakarta Jalan Colombo 01 Daerah Istimewa Yogyakarta 55281 Indonesia Department of Electronics and Informatics Engineering Education Post-Graduate Program Universitas Negeri Yogyakarta Jalan Colombo 01 Daerah Istimewa Yogyakarta 55281 Indonesia

The pandemic that has not ended has an impact on changing the educational paradigm. Existing conditions demand to continue to use virtual learning. During the epidemic, this study will examine students' demand for interactive multimedia in virtual learning. The interviews reveal that the media that teachers provide in virtual learning during this pandemic has limits. Data was gathered through interviews and questionnaires given to teachers and students. The student requirements questionnaire reveals that interactive multimedia is the most effective instructional medium for pupils. This study is part of a larger investigation of the evolution of multimedia learning during a pandemic.

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