检索结果-内蒙古大学图书馆

Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Tetsunori Koda Ao Nakagawa Sho Muroga Yasushi Endo Department of Electronic Mechanical Engineering National Institute of Technology Oshima College Suo-Oshima Japan Department of Mathematical Science and Electrical-Electronic-Computer Engineering Graduate School of Engineering Science Akita University Akita Japan Department of Electrical Engineering Graduate School of Engineering Tohoku University Sendai Japan Center for Spintronics Research Network Tohoku University Sendai Japan Center for Science and Innovation in Spintronics (CSIS) Organization for Advanced Studies Tohoku University Sendai Japan

We numerically study current density dependence of magnetization dynamics in a local area induced by the spin-orbit torque as a source of spin waves. The precession frequency of magnetization dynamics shows large change at a critical current density, which controls the wave length of spin waves. The origin of the change is due to the increase of exchange field caused by the magnetization torsion at the interface between SOT-applied and non-applied regions. Our new finding gives a way to manipulate spin wave’s properties by controlling the magnetization direction in a local area.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Micromagnetics Simulation of Highly Efficient Oscillation of Magnetization in a Ferromagnetic Local Areas via Spin Waves Induced by Spin-Orbit Torque

Micromagnetics Simulation of Highly Efficient Oscillation of...

引用

Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Tetsunori Koda Sho Muroga Yasushi Endo Department of Electronic Mechanical Engineering National Institute of Technology Oshima College Suo-Oshima Japan Department of Mathematical Science and Electrical-Electronic-Computer Engineering Graduate School of Engineering Science Akita University Akita Japan Department of Electrical Engineering Graduate School of Engineering Tohoku University Sendai Japan Center for Spintronics Research Network Tohoku University Sendai Japan Center for Science and Innovation in Spintronics (CSIS) Organization for Advanced Studies Tohoku University Sendai Japan

We study numerical simulation of highly efficient oscillation of magnetization in a ferromagnetic local region using the spin-orbit torque. It is found that in the presence of multiple SOT regions, the precession motion can be excited at a lower current density through the interaction. This interaction is caused by spin waves, and as a result, phase control between the precession motions is possible through the gap between the areas. Our new finding indicates that the interaction between the wave source and the spin wave is very complex in devices that utilize the interference effects of spin waves.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Zero Harmonic Distortion Master Converter for Medium Voltage Microgrids 14

A Zero Harmonic Distortion Master Converter for Medium Volta...

引用

14th Annual IEEE Applied Power electronics Conference and Exposition, APEC 2025

作者： Ramos, Gabriel V. De L. Brandão, Dener A. Parreiras, Thiago M. Brandao, Danilo I. De J. C.Filho, Braz Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Av. Antônio Carlos 6627 MG Belo Horizonte31270-901 Brazil Centro Federal de Educação Tecnológica de Minas Gerais Department of Electrical Engineering Belo Horizonte Brazil Universidade Federal de Minas Gerais Department of Electrical Engineering Belo Horizonte Brazil

ISBN: (纸本)9798331516116

This paper proposes the Zero Harmonic Distortion Converter (ZHD) as a master converter (MC) for medium voltage microgrids, delivering sinusoidal waveforms in both grid-connected and islanded mode without sinusoidal capacitive filtering elements. The ZHD MC ensures seamless transitions between modes using a simple control approach that eliminates the need off a voltage closed-loop control for grid-connected, islanded, and transition modes, using only a current closed-loop control for grid-connected operation. Simulation and hardware-in-the-loop results show the performance of the ZHD MC converter. © 2025 IEEE.

关键词： Closed loop control systems

来源：评论

学校读者我要写书评

暂无评论

Optimized Transmission Strategy for UAV-RIS 2.0 Assisted Communications Using Rate Splitting Multiple Access

Optimized Transmission Strategy for UAV-RIS 2.0 Assisted Com...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Aamer Mohamed Huroon Yu-Chih Huang Li-Chun Wang Department of Electrical Engineering and Computer Science International Graduate Program National Yang Ming Chiao Tung University Institute of Communications Engineering National Yang Ming Chiao Tung University Department of Electrical and Computer Engineering National Yang Ming Chiao Tung University

In this paper, we study the transmission strategy of a ground-based beyond diagonal reconfigurable intelligent surface (BD-RIS), a.k.a RIS 2.0, in a network where multiple unmanned aerial vehicles (UAVs) simultaneously transmit signals to the respective groups of users. It is assumed that each group is assigned subcarriers orthogonal to those assigned to other groups and rate splitting multiple access (RSMA) is adopted within each group. A corresponding mixed integer nonlinear programming problem (MINLP) is formulated, which aims to jointly optimize 1) allocation of BD-RIS elements to groups, 2) BD-RIS phase rotations, 3) rate allocation in RSMA, and 4) precoders. To solve the problem, we propose using generalized benders decomposition (GBD) augmented with a manifold-based algorithm. GBD splits the MINLP problem into two sub-problems, namely the primal and the relaxed master problem, which are solved alternately and iteratively. In the primal problem, we apply block coordinate descent (BCD) to manage the coupling of variables effectively. Moreover, we recognize the manifold structure in the phase rotation constraint of BD-RIS, enabling the Riemannian conjugate gradient (RCG). Simulation results demonstrate the effectiveness of the proposed approach in maximizing spectral efficiency.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Emergency detection during car driving using phase-locking index of EEG

Transactions of Japanese Society for Medical and Biological ...

引用

Transactions of Japanese Society for Medical and Biological engineering 2020年第1期58卷 21-27页

作者： Fukuda, Hiroko Kanoh, Shinʼichiro Electrical Engineering and Computer Science Graduate School of Engineering and Science Shibaura Institute of Technology Japan Department of Electronic Engineering College of Engineering Shibaura Institute of Technology Japan

Frequently, by the time car drivers perceive the danger of a crash while driving, they may not be able to move to avoid it. This reaction is a protection reflex that occurs when danger is sensed. During this reaction period, it is difficult to take action in order to avoid danger by manually controlling a vehicle. If this emergency state could be detected by an electroencephalogram (EEG), it would be possible to avoid danger automatically. In this study, the possibility to detect emergency states during car driving from the phase-locking index (PLI) of EEG was investigated. Five healthy subjects drove in a virtual reality (VR) environment with obstacles suddenly appearing in front of the car. The subjects were requested to push down a switch to stop the car immediately when they found an obstacle, to avoid crashing. VR scenes were visually presented to subjects via head-mounted displays. Two kinds of distance conditions between the car and obstacle were tested: a"far" distance, with approximately 1 s between the appearance of and collision with the obstacle, in which it was relatively easy to avoid crashing by braking;and a "near" distance with approximately 0.3 s between obstacle appearance and collision, in which crashing was more difficult to avoid. A 50-channel EEG was measured, and both the PLI and averaged evoked potentials were calculated over the span of the trials. In four out of five subjects, the phase-locking EEG was observed during the negative evoked potential at 100 ms after the obstacle appeared, and this occurred when the distance between the obstacle and the car was short, i. e. the near condition. As this phase-locking EEG response appeared immediately after the appearance of the obstacle, it is expected that the PLI of EEG can be used as an adequate indicator of an emergency state of the brain. © 2020, Japan Soc. of Med. electronics and Biol. engineering. All rights reserved.

关键词： Virtual reality

来源：评论

学校读者我要写书评

暂无评论

Baseband modulation in terahertz wave communication using micro-optical comb

Baseband modulation in terahertz wave communication using mi...

引用

2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Kikuhara, T. Makimoto, Y. Tokizane, Y. Kuse, N. Hase, E. Matsumura, Y. Kishikawa, H. Okamura, Y. Kanno, A. Hisatake, S. Yasui, T. Graduate School of Sciences and Technology for Innovation Tokushima University Tokushima770-8506 Japan Tokushima Prefectural Industrial Technology Center Tokushima770-8021 Japan Tokushima University Tokushima770-8506 Japan Center for Higher Education and Digital Transformation University of Yamanashi Yamanashi400-8510 Japan National Institute of Information and Communications Technology Tokyo184-8795 Japan Department of Electrical and Mechanical Engineering Nagoya Institute of Technology Aichi 466-8555 Japan Department of Electrical Electronic and Computer Engineering Gifu University Gifu501-1193 Japan

Terahertz (THz) wave generation using photomixing of soliton microcomb is promising technology for photonic-based THz communication due to low phase noise characteristic and integrated platform. We investigate the phase modulation in THz communication system using photomixing of a 560-GHz-spacing microcomb with UTC-PD. © 2024 The Author(s)

关键词： Terahertz waves

来源：评论

学校读者我要写书评

暂无评论

Julolidine functionalized benzimidazoline-doped fullerene derivatives for efficient and stable perovskite solar cells

引用

Interdisciplinary Materials 2024年第3期3卷 369-379页

作者： Yanqing Zhu Chenglong Li JiaHui Chen Yuxi Zhang Jianfeng Lu Min Hu Wangnan Li Fuzhi Huang Yi-Bing Cheng Hyesung Park Shengqiang Xiao State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhanChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina School of Electronic and Electrical Engineering Hubei Province Engineering Research Centre for Intelligent Micro-Nano Medical Equipment and Key TechnologiesWuhan Textile UniversityWuhanChina Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices Hubei University of Arts and ScienceXiangyangHubeiChina KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulRepublic of Korea Department of Integrative Energy Engineering Korea UniversitySeoulRepublic of Korea Hubei Key Laboratory of Fuel Cell WuhanChina

Fullerene derivatives are highly attractive materials in solar cells,organic thermoelectrics,and other ***,the intrinsic low electron mobility and electrical conductivity restrict their potential device performance,such as perovskite solar cells(PSCs).Herein,we successfully enhanced the electric properties and morphology of phenyl-C61-butyric acid methyl ester(PCBM)by n-doping it with a benzimidazoline derivative,9-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)-julolidine(JLBI-H)via a solution *** found the n-doping can not only improve the conductivity and optimize the band alignment but also enable the PCBM to have a constantly strong charge extraction ability in a wide temperature from 173 to 373 K,which guarantees a stable photovoltaic performance of the corresponding PSCs under a wide range of operating *** the JLBI-H-doped PCBM,we improved the efficiency from 17.9%to 19.8%,along with enhanced stability of the nonencapsulated devices following the aging protocol of ISOS-D-1.

关键词： charge extraction electron mobility n-doping PSCs wide operation temperature

来源：评论

学校读者我要写书评

暂无评论

Ultra-Low Crosstalk and Fabrication-Tolerant Silicon-Nitride O-Band (de)Multiplexer Using Bragg Grating-Assisted Contra-Directional Coupler

IEEE Photonics Journal

引用

IEEE Photonics Journal 2023年第1期15卷 1页

作者： Chung, Kuo-Fang Shih, Tien-Tsorng Lee, Jiun-Haw Huang, Ding-Wei Huang Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei106319 Taiwan Department of Electronic Engineering National Kaohsiung University of Science and Technology Kaohsiung807618 Taiwan Department of Electrical Engineering National Taiwan University Taipei106319 Taiwan

A wavelength division (de)multiplexing (WDM) filter with ultra-low channel crosstalk (XT) and high tolerance was proposed for a 1 × 4 O-band coarse-WDM (CWDM) system on a silicon-on-insulator (SOI). The filter consists of four waveguide Bragg grating (WBG) structures, each one having a multi-mode waveguide and corrugations at both waveguide side walls. To relax the critical dimension, low-material-index silicon nitride (SiNx) was utilized instead of silicon. For efficient design of each SiNx multi-mode WBG (MMWBG), the core and corrugation widths were engineered over the perturbed-permittivity coupled-mode theory, leading to an ultra-high side-lobe suppression ratio >25.3 dB. The overall CWDM filter offers flat-top responses with ultra-low excess losses (ELs) -0.45 dB, broad 1-dB bandwidths (BWs) ∼13.45 nm, ultra-low XTs © 2009-2012 IEEE.

关键词： Silicon photonics

来源：评论

学校读者我要写书评

暂无评论

Reconfigurable Holographic Surface: A New Paradigm for Ultra-Massive MIMO

arXiv

引用

arXiv 2024年

作者： Di, Boya Zhang, Hongliang Zhang, Rui Han, Zhu Song, Lingyang School of Electronics Peking University China School of Electronic and Computer Engineering Peking University Shenzhen Graduate School China School of Science and Engineering Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Guangdong Shenzhen China Department of Electrical and Computer Engineering National University of Singapore Singapore Electrical and Computer Engineering Department University of Houston United States

Evolving from massive multiple-input multiple-output (MIMO) in current 5G communications, ultra-massive MIMO emerges as a seminal technology for fulfilling more stringent requirements of future 6G communications. However, widely-utilized phased arrays relying on active components make the implementation of ultra-massive MIMO in practice increasingly prohibitive from both cost and power consumption perspectives. In contrast, the development of reconfigurable holographic surface (RHS) provides a new paradigm to solve the above issue without the need of costly hardware components. By leveraging the holographic principle, the RHS serves as an ultra-thin and lightweight surface antenna integrated with the transceiver, which is a promising alternative to phased arrays for realizing ultra-massive MIMO. In this paper, we provide a comprehensive overview of the RHS, especially the RHS-aided communication and sensing. We first describe the basic concepts of RHS, and introduce its working principle and unique practical constraints. Moreover, we show how to utilize the RHS to achieve cost-efficient and high-performance wireless communication and sensing, and introduce the key technologies. In particular, we present the implementation of RHS with a wireless communication prototype, and report the experimental measurement results based on it. Finally, we outline some open challenges and potential future directions in this area. Copyright © 2024, The Authors. All rights reserved.

关键词： Antenna phased arrays

来源：评论

学校读者我要写书评

暂无评论

Real-Time Graph-Based Optimization for GNSS-Doppler Integrated RTK-GNSS/IMU/DR Positioning System in Urban Area

Real-Time Graph-Based Optimization for GNSS-Doppler Integrat...

引用

IEEE Symposium on Intelligent Vehicle

作者： Aoki Takanose Eijiro Takeuchi Alexander Carballo Junichi Meguro Kazuya Takeda Graduate School of Informatics Nagoya University Japan TierIV Inc. Japan Department of Electrical Electronic and Computer Engineering Gifu University Gifu Japan Department of Mechatronics Engineering Meijo University Japan

Autonomous driving of vehicles and robots requires highly accurate position information, and RTK-GNSS is expected to be utilized for this purpose. In this paper, we propose a robust and real-time operation method by introducing graph optimization into the integrated RTK-GNSS/IMU method. The proposed method is an extension of a method using vehicle trajectories that can estimate positions with lane-level accuracy even in urban areas. The position is estimated by removing GNSS multipaths from the shape of a vehicle trajectory of several hundred meters and averaging the remaining GNSS results. This method does not take into account the errors in the vehicle trajectory and cannot fully benefit from the high accuracy positioning solution of RTK-GNSS. To solve this problem, we introduce graph optimization to the base method, which treats the error state as a probabilistic model. However, general graph optimization methods have problems with processing time and outlier elimination. The proposed method solves these problems by restricting the time series data to be optimized and using a two-step optimization structure. Evaluations show that the proposed method is effective because it satisfies the requirements for real-time operation and improves accuracy compared to conventional methods.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：