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2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023

作者： Saito, Yoshiaki Ikeda, Shoji Inoue, Hirofumi Endoh, Tetsuo Tohoku University Center for Innovative Integrated Electronic Systems Sendai980-0845 Japan Tohoku University Center for Spintronics Research Network Sendai980-8577 Japan Tohoku University Research Institute of Electrical Communication Sendai980-8577 Japan Tohoku University Center for Science and Innovation in Spintronics Sendai980-8577 Japan Tohoku University Graduate School of Engineering Department of Electrical Engineering Sendai980-8579 Japan

ISBN: (纸本)9798350338362

Damping-like spin-orbit torque (SOT) efficiency (effective spin Hall angle: ξDL) is investigated in synthetic antiferromagnetic (AF) systems using Pt-Cu alloy/Ir/Pt-Cu alloy spacer layers. AF interlayer exchange coupling through Pt-Cu alloy/Ir/Pt-Cu alloy spacer layers was observed. We also found that the magnitude of ξDL for synthetic AF system using Pt57Cu43 alloy/Ir/ Pt57Cu43 alloy spacer layer is larger than that for synthetic AF system using Pt/Ir/Pt spacer layer, comparing to devices with nearly similar magnitudes of interlayer exchange coupling of 0.11 mJ/m2. The observed maximum magnitude of ξDL is 19.9% for the synthetic AF system using Pt57Cu43 alloy/Ir/Pt57Cu43 alloy. The synthetic AF system will be a promising building block for future nonvolatile high-speed memories and logic circuits using the spin Hall effect. © 2023 IEEE.

关键词： Damping

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DIGITAL FREQUENCY-LOCKED LOOP WITH WIDE LOCK-IN RANGE AND LOW FREQUENCY ERROR BASED ON MULTI-PHASE CLOCK

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International Journal of Innovative Computing, Information and Control 2022年第6期18卷 1979-1988页

作者： Yahara, Mitsutoshi Fujimoto, Kuniaki Nishiguchi, Daishi Harada, Yujiro Fukuhara, Masaaki Department of Medical Care and Welfare Engineering Tokai University 9-1-1 Toroku Higashi-ku Kumamoto-shi Kumamoto862-8652 Japan Department of Electronics and Intelligent Systems Engineering Tokai University 9-1-1 Toroku Higashi-ku Kumamoto-shi Kumamoto862-8652 Japan Graduate School of Information and Telecommunication Engineering Tokai University 2-3-23 Takanawa Minato-ku Tokyo108-8619 Japan Department of Electrical and Electronic Engineering National Institute of Technology Kurume College 1-1-1 Komorino Kurume-shi Fukuoka830-8555 Japan

An all-digital frequency-locked loop (DFLL) using a multi-phase clock-based 1 + 1/k divider has been proposed. This circuit can reduce the jitter of the output signal extremely small. However, it has the problem of a narrow lock-in range. In this paper, we propose a DFLL with a wide frequency lock-in range and low frequency error using the m + n/k divider based on a multi-phase clock. The proposed DFLL can realize an extremely wide frequency lock-in range compared to the conventional DFLL using a multi-phase clock. Also, the frequency detection error between input and output signals can be kept within one phase difference of the multi-phase clock. As a result, the steady-state frequency error of the output signal is also within one phase difference of the multi-phase clock. These characteristics were confirmed by simulation using Verilog-HDL, a hardware description language. © 2022, ICIC International. All rights reserved.

关键词： Phase locked loops

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Torque control of a series elastic actuator using an ultrasonic motor with angular-velocity saturation

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IEEJ Transactions on Industry Applications 2020年第5期140卷 378-386页

作者： Nakamura, Toshiya Yashiro, Daisuke Yubai, Kazuhiro Komada, Satoshi Department of Electrical and Electronic Engineering Graduate School of Engineering Mie University 1577 Kurimamachiya Tsu Mie514-8507 Japan

A series elastic actuator (SEA) using an ultrasonic motor (USM) and an elastic element has attracted attention as a compact actuator with high torque-weight ratio and high force control performance. However, an elastic element in a SEA often causes mechanical vibrations. To suppress these vibrations, studies implemented the state feedback of the motor-and load-side angles. However, as the controller has many integrators, the control system becomes unstable when the angular-velocity of the USM is saturated. Therefore, in this study, integrators in the controller were reduced in number. Furthermore, a limit error feedback controller was designed to suppress the windup phenomenon caused by the integrators. The frequency analysis using a describing function showed that stability is guaranteed even if the angular-velocity is saturated. In addition, the experimental results indicate that an overshoot of the torque response is suppressed. © 2020 The Institute of electrical Engineers of Japan.

关键词： Controllers

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Ultrathin-shell epitaxial Ag@Au core-shell nanowires for high-performance and chemically-stable electronic, optical, and mechanical devices

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Nano Research 2021年第11期14卷 4294-4303页

作者： Yangzhi Zhu Sanggon Kim Xuezhi Ma Peter Byrley Ning Yu Qiushi Liu Xiaoming Sun Da Xu Sangshan Peng Martin C.Hartel Shiming Zhang Vadim Jucaud Mehmet R.Dokmeci Ali Khademhosseini Ruoxue Yan Department of Chemical and Environmental Engineering Bourns College of EngineeringUniversity of California-RiversideRiversideCA92521USA Terasaki Institute for Biomedical Innovation Los AngelesCA90064USA Department of Electrical and Computer Engineering University of California-RiversideRiversideCA92521USA State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China Department of Bioengineering University of California-Los AngelesLos AngelesCA90095USA Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Material Science and Engineering Program University of California-RiversideRiversideCA92521USA

Silver nanowires (AgNWs) hold great promise for applications in wearable electronics, flexible solar cells, chemical and biological sensors, photonic/plasmonic circuits, and scanning probe microscopy (SPM) due to their unique plasmonic, mechanical, and electronic properties. However, the lifetime, reliability, and operating conditions of AgNW-based devices are significantly restricted by their poor chemical stability, limiting their commercial potentials. Therefore, it is crucial to create a reliable oxidation barrier on AgNWs that provides long-term chemical stability to various optical, electrical, and mechanical devices while maintaining their high performance. Here we report a room-temperature solution-phase approach to grow an ultra-thin, epitaxial gold coating on AgNWs to effectively shield the Ag surface from environmental oxidation. The Ag@Au core-shell nanowires (Ag@Au NWs) remain stable in air for over six months, under elevated temperature and humidity (80 °C and 100% humidity) for twelve weeks, in physiological buffer solutions for three weeks, and can survive overnight treatment of an oxidative solution (2% H2O2). The Ag@Au core-shell NWs demonstrated comparable performance as pristine AgNWs in various electronic, optical, and mechanical devices, such as transparent mesh electrodes, surface-enhanced Raman spectroscopy (SERS) substrates, plasmonic waveguides, plasmonic nanofocusing probes, and high-aspect-ratio, high-resolution atomic force microscopy (AFM) probes. These Au@Ag core-shell NWs offer a universal solution towards chemically-stable AgNW-based devices without compromising material property or device performance.

关键词： epitaxial growth core-shell nanowire plasmonic waveguides atomic force microscopy(AFM)probe transparent electrode wearable electronics

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Low-Capacitance Solid-State Transformer Control Using an Analytic Filter

Low-Capacitance Solid-State Transformer Control Using an Ana...

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International Conference on Power electronics (ICPE)

作者： Radhika Sarda Ezequiel Rodriguez Naga Brahmendra Gorla Yadav Glen G. Farivar Josep Pou V. B. Sriram Anshuman Tripathi Energy Research Institute at NTU Interdisciplinary Graduate Programme Nanyang Technological University Singapore Energy Research Institute at NTU Nanyang Technological University Singapore Department of Electrical Engineering Indian Institute of Technology Palakkad India Department of Electrical and Electronic Engineering University of Melbourne Melbourne Australia School of Electrical and Electronic Engineering Nanyang Technological University Singapore

In the modular three-stage solid-state transformer (SST), each phase is integrated with large dc-link capacitors as energy buffers, to filter the second harmonic capacitor voltage ripple generated due to single-phase power processing. Although large dc-link capacitors reduce the coupling between stages of the SST and simplify the controller design, they compromise the reliability, safety and power density of the SST. Accordingly, a low-capacitance SST is desirable to address these challenges. To provide a high-bandwidth control for the low-capacitance SST, this paper proposes using an analytic filtering scheme rather than the low-pass filters used in conventional SST control schemes. A portion of the second harmonic power ripple in the high-voltage dc-link capacitors is processed by the SST s dc-dc stage to facilitate the use of low capacitance. The effectiveness of the proposed control is demonstrated through a simulation study in PLECS.

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Multi-Resonant Class-E2 DC-DC Converter based on Voltage-Controlled Oscillator

Multi-Resonant Class-E2 DC-DC Converter based on Voltage-Con...

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IEEE Kansas Power and Energy Conference

作者： Lucas Sangoi Mendonça Valmir de Oliveira Academic Department of Electronics Federal University of Technology-Paraná Curitiba Brazil Academic Department of Electronics Graduate Program in Electrical and Computer Engineering Federal University of Technology-Paraná Curitiba Brazil

ISBN: (数字)9798350372403

ISBN: (纸本)9798350372410

This paper shows the design and implementation of a multi-resonant Class-E 2 DC-DC converter based on voltage- controlled oscillator. By cascading a Class-E inverter to a Class-E rectifier, a double soft-switching converter is obtained, in which, the active switch turns-on with zero voltage switching and the diode turns-off with zero derivative voltage switching. This work relies on design equations based on normalized charts that relate the resonant frequency to the current transfer function, quality factor and peak values for the switch variables. In order to activate the switch, a circuit scheme is proposed based on a voltage-controlled oscillator connected to a low-side gate-driver. Therefore, it is not necessary to use a microcontroller neither auxiliary power sources. Experimental results are presented to show the feasibility of the proposed converter.

关键词： Q-factor Voltage-controlled oscillators Transfer functions Resonant frequency Rectifiers Switches DC-DC power converters

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Benchmarking the Robustness of Spatial-Temporal Models Against Corruptions 35

Benchmarking the Robustness of Spatial-Temporal Models Again...

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35th Conference on Neural Information Processing Systems - Track on Datasets and Benchmarks, NeurIPS Datasets and Benchmarks 2021

作者： Yi, Chenyu Yang, Siyuan Li, Haoliang Tan, Yap-Peng Kot, Alex C. School of Electrical and Electronic Engineering Nanyang Technological University Singapore Interdisciplinary Graduate Programme Nanyang Technological University Singapore Department of Electrical Engineering City University of Hong Kong Hong Kong

The state-of-the-art deep neural networks are vulnerable to common corruptions (e.g., input data degradations, distortions, and disturbances caused by weather changes, system error, and processing). While much progress has been made in analyzing and improving the robustness of models in image understanding, the robustness in video understanding is largely unexplored. In this paper, we establish a corruption robustness benchmark, Mini Kinetics-C and Mini SSV2-C, which considers temporal corruptions beyond spatial corruptions in images. We make the first attempt to conduct an exhaustive study on the corruption robustness of established CNN-based and Transformer-based spatial-temporal models. The study provides some guidance on robust model design and training: the generalization ability of spatial-temporal models implies robustness against temporal corruptions;model corruption robustness (especially robustness in the temporal domain) enhances with computational cost and model capacity, which may contradict with the current trend of improving the computational efficiency of models. Moreover, we find the robustness intervention for image-related tasks (e.g., training models with noise) may not work for spatial-temporal models. © 2021 Neural information processing systems foundation. All rights reserved.

关键词： Spatio-temporal data

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A Comprehensive Review on Reconfigurable Intelligent Surface for 6G Communications: Overview, Deployment, Control Mechanism, Application, Challenges, and Opportunities

TechRxiv

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TechRxiv 2023年

作者： Hasan, Syed Rakib Sabuj, Saifur Rahman Hamamura, Masanori Hossain, M.D. Akbar Department of Electrical and Electronic Engineering Brac University Dhaka1212 Bangladesh School of Informatics Graduate School of Engineering Kochi University of Technology Japan Deloitte Auckland New Zealand

The development of our neoteric scientific fields has reached such a magnificent level that the benefits from innovation have extended to all regions, including those most distant. Modern information and communication network systems have greatly improved the overall effectiveness and performance of the wireless networks. With the emergence of cellular networks, the wireless communication network system has evolved from the first generation to the sixth generation (6G), which will provide an integrated framework for a variety of utilities and applications. The goal of 6G network systems is to improve channel capacity, low bit rate error, efficient signal transmission, and low latency while providing reliable connectivity and seamless communication. Various technologies are integrated with 6G network systems to provide controlled, efficient, and reliable communication. One emerging technology for 6G communication network systems is reconfigurable intelligent surfaces (RIS), which is ideal for smooth and controllable wireless signal transmission. RIS uses smart beamforming methods with the assistance of an electronic circuit controller to provide superior signal quality. This study presents a complete overview of RIS, including its hardware architecture, key characteristics, control mechanism, operating frequency, communication duplex mode, and operating mode. The study also elaborates on the RIS operational environment, advantages of implementing RIS, deployment, and different types of communication by utilizing RIS. Finally, we conclude with a discussion of challenges and future research directions to overcome limitations to achieve the goal of RIS implementation and RIS-aided communication for 6G communication systems. © 2023, CC BY.

关键词： Bit error rate

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Exploring Bess Services for Transformer Energization on Offshore Oil and Gas Platforms

Exploring Bess Services for Transformer Energization on Offs...

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IEEE Petroleum and Chemical Industry Conference - Brasil (PCIC Brasil)

作者： Joseph K. Banda Lucas S. Araujo Danilo I. Brandao Fernando P. Marafão Elisabetta Tedeschi Department of Electric Power Engineering Norwegian University of Science and Technology (NTNU) Trondheim Norway Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais (UFMG) Belo Horizonte Brazil Department of Control and Automation Engineering Universidade Estadual Paulista (Unesp) Sorocaba Brazil Department of Industrial Engineering University of Trento Trento Italy

ISBN: (数字)9798350368154

ISBN: (纸本)9798350368161

The electrification of offshore oil and gas platforms (OOGPs), using offshore wind turbines, is now a reality, aimed at minimizing carbon emissions. In this scenario, the utilization of battery energy storage systems (BESS) improves both efficiency and power quality. As this integration comes with a high CAPEX, industries demand exploring BESS for multiple ancillary services on OOGPs. Thus, this paper proposes an alternative approach to energizing a power transformer (PT) using the BESS power conversion system (PCS) on the platform, aiming to minimize inrush currents. This avoids the necessity for additional bulky devices, converters, or dc voltage sources specifically designated for this purpose. The strategy consists of manipulating residual core flux using BESS PCS followed by a controlled switching, which reduces inrush currents during PT energization. The results show effective reduction of the inrush current from 2.31 pu to 0.16 pu for the presented case study.

关键词： Offshore installations Battery energy storage system Oils Voltage Switches Oil insulation Transformer cores

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Super-Mossian Dielectrics for Nanophotonics

Super-Mossian Dielectrics for Nanophotonics

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Conference on Lasers and Electro-Optics (CLEO)

作者： Xielin Wang Chloe F. Doiron Zhichao Li Jacob B. Khurgin Gururaj V. Naik Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX Department of Electrical and Computer Engineering Johns Hopkins University Baltimore MD Department of Electrical and Computer Engineering Rice University Houston TX

Searching for high-index dielectrics, we identify materials that break the index upper bound set by Moss’ rule. We highlight the promise of such super-Mossian materials by demonstrating nanophotonic devices made of F... 详细信息

ISBN: (纸本)9781957171258

关键词： Fourier transform infrared spectroscopy Nanophotonics Optical constants Optical materials Refractive index Whispering gallery modes

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