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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Kunihiro Ogata Kosuke Takano Nobuto Matsuhira Tsuyoshi Nakayama Human Augmentation Research Center National Institute of Advanced Industrial Science and Technology (AIST) Chiba Japan Department of Engineering Science and Mechanics Shibaura Institute of Technology Tokyo Japan National Rehabilitation Center for Persons With Disabilities Research Institute Saitama Japan

The purpose of this study is to quantify the load generated on the buttocks during wheelchair operation in order to clarify the cause of pressure injuries on the buttocks of wheelchair users. In the case of repeated measurements, pressure injuries may occur by conducting experiments with people with actual disabilities. In this study, we proposed a method of dynamic simulation using a humanoid model in order to carry out buttock load safely due to exercise. In addition, the load on the buttocks is quantified by reproducing a simulated cushion that reproduces the actual physical properties on the simulator. When we conducted an evaluation experiment of the developed simulation to quantify the buttock load, we confirmed the validity of this simulator in the front-back direction. On the other hand, the correlation with the actual data is low in the left-right direction, and it is considered necessary to improve the humanoid model in order to improve the accuracy.

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Balanced Microstrip Filtering Phase Shifter Using Three-end Folded Coupled Lines

Balanced Microstrip Filtering Phase Shifter Using Three-end ...

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2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2021

作者： Nie, Yi Zhang, Wei Shi, Jin Nantong University School of Information Science and Technology Nantong China Nantong Research Institute for Advanced Communication Technologies Research Center for Intelligent Information Technology Nantong Key Laboratory of Advanced Microwave Technology Nantong University Nantong China

ISBN: (纸本)9781665418287

A balanced microstrip filtering phase shifter using 2 three-end folded coupled lines and 3 transmission lines is proposed. With such structure, multiple differential-mode (DM) transmission zeros (TZs) or common-mode (CM) TZs can be obtained so that good frequency selectivity or wideband CM suppression can be achieved. The phase shift covers the DM performance. Compared with the reported design, the proposed design has wider CM suppression and better frequency selectivity. One 45° prototype is demonstrated. The measured phase shift FBW(45° ± 2.3°) is 43%, 20-dB CM suppression FBW is better than 140%, and 3-dB FBW is 39.4%. © 2021 IEEE.

关键词： Phase shifters

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A perspective of spatial variability and ecological risks of antibiotics in the agricultural-pastoral ecotone soils in eastern Inner Mongolia

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Chemosphere 2024年 353卷 141627页

作者： Bao, Feifei Zhou, Yang Zhang, Zhengyu Du, Yuhan Zhang, Hongyan Huang, Yuanfang Innovation Center of Pesticide Research Department of Applied Chemistry College of Science China Agricultural University Beijing100193 China Ministry of Agriculture and Rural Affairs College of Land Science and Technology China Agricultural University Beijing100193 China

Antibiotics have garnered growing attention as pharmaceuticals ubiquitously present in human society. Within the soil environment, antibiotics exhibit a propensity for high environmental persistence, thereby posing a potential threat to the ecosystem. However, research on antibiotics in agricultural-pastoral ecotone soils is scarce. This study investigates the occurrence, distribution and risk of 11 common antibiotics in agricultural soils of the agro-pastoral transition zone in Horqin Left Middle Banner, eastern Inner Mongolia. The total concentration varies from not detectable to 609.62 μg/kg. Tetracyclines are the dominant antibiotic, with a higher detection frequency than Macrolides and Sulfonamides. The detection rates of the three types of antibiotics differ significantly. The study also finds that soil properties (organic matter content, pH, bulk density, clay, cation exchange capacity have no significant correlation with antibiotics in soil. Moreover, spatial regression analysis reveals that population density is the primary factor influencing the spatial distribution of antibiotics in soil. Ecological risk assessment shows that clarithromycin and erythromycin are the two most harmful factors in the ecological risk of agricultural soil. © 2024 Elsevier Ltd

关键词： Risk assessment

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High Temperature Oxidation Behavior of Pt Modified Dual-Phase Conicral Medium-Entropy Alloy Under Water Vapour at 1100 °C

SSRN

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SSRN 2024年

作者： Ma, Tao Kong, Dehao Huang, Taihong Li, Qing Cheng, Yuhang Yin, Guanwen Yang, Zhennan Wang, Jianrui Song, Peng Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China National-Local Joint Engineering Research Center for Technology of Advanced Metallic Solidification Forming and Equiment Kunming University of Science and Technology Kunming650093 China Yunnan Provincial International Joint Research and Development Center for Clean Emission Technology of Internal Combustion Engine Kunming650093 China Faculty of Civil Aviation and Aeronautics Kunming University of Science and Technology Kunming650500 China Yunnan Engineering Research Center of Metallic Powder Materials Kunming650093 China

Pt modified CoNiCrAl medium-entropy alloys (MEAs) with dual-phase were designed and optimized with novel long-term oxidation resistance life at 1100 °C. MEAs have a lower oxidation rate, and water vapour accelerated the oxidation of MEAs, which was twice that of air. With the Pt content increases, combined with the high Young's modulus and hardness, the formation of lower surface rumpling of the Al2O3 scale for 10Pt-MEA. Precipitation of Pt enrichment at the phase boundary hinders oxygen diffusion and reduces oxidation rate. The designed MEAs explore another approach to expand the application of the high/medium-entropy alloys. © 2024, The Authors. All rights reserved.

关键词： Thermooxidation

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Engineering Sodium Metal Anode with Sodiophilic Bismuthide Penetration for Dendrite-Free and High-Rate Sodium-Ion Battery

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Engineering 2022年第4期8卷 87-94页

作者： Wanyu Zhao Min Guo Zhijun Zuo Xiaoli Zhao Huanglin Dou Yijie Zhang Shiying Li Zichen Wu Yayun Shi Zifeng Ma Xiaowei Yang Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Chemistry and Chemical Engineering Shaoxing UniversityShaoxing 312000China Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Taiyuan University of TechnologyTaiyuan 030024China Shanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Sodium(Na)metal batteries with a high volumetric energy density that can be operated at high rates are highly ***,an uneven Na-ion migration in bulk Na anodes leads to localized deposition/dissolution of sodium during high-rate plating/stripping behaviors,followed by severe dendrite growth and loose ***,we engineer the Na hybrid anode with sodiophilic Na_(3)Bi-penetration to develop the abundant phase-boundary ionic transport *** to intrinsic Na,the reduced adsorption energy and ion-diffusion barrier on Na_(3)Bi ensure even Na^(+)nucleation and rapid Na^(+)migration within the hybrid electrode,leading to uniform deposition and dissolution at high current ***,the bismuthide enables compact Na deposition within the sodiophilic framework during cycling,thus favoring a high volumetric ***,the obtained anode was endowed with a high current density(up to 5 mA∙cm^(−2)),high areal capacity(up to 5 mA∙h∙cm^(−2)),and long-term cycling stability(up to 2800 h at 2 mA∙cm^(−2)).

关键词： Sodium metal anode Dendrite-free Compact electrodeposition Sodiophilic bismuthide Ion diffusion barrier

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Molecular Dynamics for Spin Systems

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原子核物理评论 2024年第3期41卷 806-810页

作者： MARUYAMA Toshiki YASUTAKE Nobutoshi Advanced Science Research Center Japan Atomic Energy AgencyIbaraki 319-1195Japan Department of Physics Chiba Institute of TechnologyChiba 275-0023Japan

We present a microscopic simulation of particles with time-dependent spins,where different interaction and density are *** has been observed for the attractive spin-spin interaction,while antiferromagnetism and paramagnetism have been observed in different density region for the repulsive spin-spin *** method developed here should be extended to include spin-color interaction into“color molecular dynamics”.

关键词： molecular dynamics ferromagnetism antiferromagnetism paramagnetism

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CSLP: Collaborative Solution to Long-Tail Problem and Popularity Bias in Sequential Recommendation

CSLP: Collaborative Solution to Long-Tail Problem and Popula...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Yan Huang Zhenyu Yang Wenyue Hu Baojie Xu Zhibo Zhang The Key Laboratory of Computing Power Network and Information Security Ministry of Education Shandong Computer Science Center (National Supercomputer Center in Jinan) Qilu University of Technology (Shandong Academy of Sciences) Jinan China Shandong Engineering Research Center of Big Data Applied Technology Faculty of Computer Science and Technology Qilu University of Technology (Shandong Academy of Sciences) Jinan China Shandong Provincial Key Laboratory of Computer Networks Shandong Fundamental Research Center for Computer Science Jinan China

ISBN: (数字)9781665410205

ISBN: (纸本)9781665410212

Sequential Recommender Systems (SRS), leveraging the temporal information from users' behaviors, have noticeably improved user experience against traditional systems. However, these behaviors often follow long-tail distribution, making the systems biased towards popular items (i.e., popularity bias). Moreover, popularity bias would amplify the neglect of long-tail recommendations, thereby sharpening the long-tail problem. Previous researches usually address these challenges independently, focusing on reducing the over-recommendation of popular items or enhancing the representation quality of tail items. Indeed, it is possible to incorporate their merits to achieve the best of both worlds. Thus, we propose a novel and unified framework, named Collaborative Solution to Long tailed problem and Popularity bias (CSLP), to tackle both the long-tail problem and popularity bias simultaneously. To achieve this, we first introduce a representation enhancement module featuring dual generators to enhance user and item representations, particularly for those in the tail. On the other hand, a debiasing module incorporating an Inverse Propensity Score (IPS) with a clipping strategy is introduced to further alleviate the popularity bias. Specifically, this clipping strategy demonstrates a clear decrease in the original IPS method's variance, effectively improving the recommendation for stability and accuracy. Experiments on three widely-used datasets show CSLP's effectiveness in solving both issues. CSLP surpasses all baselines (traditional, popularity bias, and long-tail problem) in overall performance, significantly enhancing recommendation accuracy for both tail users and items, and achieving a more balanced ratio of recommendations between popular and tail items. Code is available at https://***/Echohuangyan/CSLP.

关键词： Hands Heavily-tailed distribution Accuracy Collaboration Tail Linear programming Generators User experience IP networks Recommender systems

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In-memory computing with emerging nonvolatile memory devices

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science China(Information sciences) 2021年第12期64卷 23-68页

作者： Caidie CHENG Pek Jun TIW Yimao CAI Xiaoqin YAN Yuchao YANG Ru HUANG State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing Key Laboratory of Microelectronic Devices and Circuits (MOE) Department of Micro/nanoelectronicsPeking University Center for Brain Inspired Chips Institute for Artificial IntelligencePeking University Center for Brain Inspired Intelligence Chinese Institute for Brain Research (CIBR)

The von Neumann bottleneck and memory wall have posed fundamental limitations in latency and energy consumption of modern computers based on von Neumann architecture. In-memory computing represents a radical shift in the computer architecture that can address such problems by merging computing functions within the memory itself. In this article, we review the emerging nonvolatile memory devices,such as resistance-based and charge-based memory devices, that are explored for in-memory computing applications. We will provide an overview of the materials, mechanisms, and integration of these devices,and discuss the optimizations at the device and array levels that are required to better support in-memory computing. Recent progress in the application of in-memory computing in artificial neural networks, spiking neural networks, digital logic in memory as well as hardware security will also be discussed. Finally, we will discuss the remaining challenges in this field and potential pathways to address them.

关键词： in-memory computing von Neumann bottleneck nonvolatile memory energy efficiency neural network

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Distributed, Continuous and Real-time Trajectory Similarity Search

Distributed, Continuous and Real-time Trajectory Similarity ...

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International Symposium on Parallel and Distributed Computing

作者： Salman Ahmed Shaikh Hiroyuki Kitagawa Akiyoshi Matono Artificial Intelligence Research Center National Institute of Advanced Industrial Science and Technology Tokyo Japan International Institute for Integrative Sleep Medicine University of Tsukuba Tsukuba Japan

ISBN: (数字)9798350369199

ISBN: (纸本)9798350369205

Moving objects’ trajectory data is becoming increasingly available with the omnipresent GPS-equipped devices, e.g., smart phones, smart watches, etc. Identification of similar trajectories is a fundamental requirement of many real-world applications, for instance, car pooling, road planning, epidemic contact tracing. There exist a number of studies focusing on trajectory similarity search, where given a query trajectory, similar trajectories are searched from a trajectory store. GPS devices generate trajectories as a continuous data stream, highlighting the critical need for real-time and continuous trajectory similarity search. Thus, given a trajectories stream ($S_{\Gamma}$) and a trajectory store (R), we propose a distributed, continuous and real-time similarity search between $S_{\Gamma}$ and R. The proposed method employs an index-based strategy to facilitate effective similarity search, with the added capability of execution in distributed environments to ensure scalable processing. A comprehensive empirical study is provided to demonstrate the efficiency and pruning capability of the proposed approach.

关键词： Epidemics Roads Focusing Real-time systems Trajectory Planning Object recognition Distributed computing Smart phones Global Positioning System

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Heavily Damped Precessional Switching with Very Low Write-Error Rate in Elliptical-Cylinder Magnetic Tunnel Junctions

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Physical Review applied 2022年第5期18卷 054069-054069页

作者： R. Matsumoto S. Yuasa H. Imamura National Institute of Advanced Industrial Science and Technology (AIST) Research Center for Emerging Computing Technologies Ibaraki Tsukuba 305-8568 Japan

Voltage-induced dynamic switching in magnetic tunnel junctions (MTJs) is a writing technique for voltage-controlled magnetoresistive random access memory (VCMRAM), which is expected to be an ultimate nonvolatile memory with ultralow power consumption. In conventional dynamic switching, the width of subnanosecond write voltage pulses must be precisely controlled to achieve a sufficiently low write-error rate (WER). This very narrow tolerance of pulse width is the biggest technical difficulty in developing VCMRAM. Heavily damped precessional switching is a writing scheme for VCMRAM with a substantially high tolerance of pulse width, although the minimum WER has been much higher than that of conventional dynamic switching with an optimum pulse width. In this study, we theoretically investigate the effect of MTJ shape and the direction of the applied magnetic field on the WER of heavily damped precessional switching. The results show that the WER in elliptical-cylinder MTJs can be several orders of magnitude smaller than that in usual circular-cylinder MTJs when the external magnetic field is applied parallel to the minor axis of the ellipse. The reduction in the WER is due to the fact that the demagnetization field narrows the component of the magnetization distribution perpendicular to the plane direction immediately before the voltage is applied.

关键词： Demagnetization Magnetic anisotropy Magnetization dynamics Spin dynamics Spintronics Devices for digital logic, storage & processing Magnetic tunnel junctions Landau-Lifschitz-Gilbert equation

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