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arXiv 2023年

作者： Kawasumi, Ryota Takeda, Koujin Department of Mathematics Graduate School of Science and Engineering Chuo University Japan Department of Mechanical Systems Engineering Graduate School of Science and Engineering Ibaraki University Japan

We study the problem of hyperparameter tuning in sparse matrix factorization under Bayesian framework. In the prior work, an analytical solution of sparse matrix factorization with Laplace prior was obtained by variational Bayes method under several approximations. Based on this solution, we propose a novel numerical method of hyperparameter tuning by evaluating the zero point of normalization factor in sparse matrix prior. We also verify that our method shows excellent performance for ground-truth sparse matrix reconstruction by comparing it with the widely-used algorithm of sparse principal component analysis. Copyright © 2023, The Authors. All rights reserved.

关键词： Numerical methods

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Active Learning for Level Set Estimation Using Randomized Straddle Algorithms

arXiv

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arXiv 2024年

作者： Inatsu, Yu Takeno, Shion Kutsukake, Kentaro Takeuchi, Ichiro Department of Computer Science Nagoya Institute of Technology Japan Department of Mechanical Systems Engineering Graduate School of Engineering Nagoya University Japan RIKEN Center for Advanced Intelligence Project Japan Institute of Materials and Systems for Sustainability Nagoya University Japan Department of Materials Process Engineering Graduate School of Engineering Nagoya University Japan

Level set estimation (LSE), the problem of identifying the set of input points where a function takes value above (or below) a given threshold, is important in practical applications. When the function is expensive-to-evaluate and black-box, the straddle algorithm, which is a representative heuristic for LSE based on Gaussian process models, and its extensions having theoretical guarantees have been developed. However, many of existing methods include a confidence parameter βt1/2 that must be specified by the user, and methods that choose βt1/2 heuristically do not provide theoretical guarantees. In contrast, theoretically guaranteed values of βt1/2 need to be increased depending on the number of iterations and candidate points, and are conservative and not good for practical performance. In this study, we propose a novel method, the randomized straddle algorithm, in which βt in the straddle algorithm is replaced by a random sample from the chi-squared distribution with two degrees of freedom. The confidence parameter in the proposed method has the advantages of not needing adjustment, not depending on the number of iterations and candidate points, and not being conservative. Furthermore, we show that the proposed method has theoretical guarantees that depend on the sample complexity and the number of iterations. Finally, we confirm the usefulness of the proposed method through numerical experiments using synthetic and real data. Copyright © 2024, The Authors. All rights reserved.

关键词： Active learning

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Mxenes as a versatile nanoplatform: Synthesis and emerging biomedical applications

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Journal of Industrial and engineering Chemistry 2025年 149卷 275-312页

作者： Amani, Ali Mohammad Vafa, Ehsan Mirzae, Maryam Abbasi, Milad Vaez, Ahmad Najdian, Atena Jahanbin, Alireza Kasaei, Seyed Reza Mosleh-Shirazi, Sareh Kamyab, Hesam Chelliapan, Shreeshivadasan Rajendran, Saravanan Guamán, Linda P. Department of Medical Nanotechnology School of Advanced Medical Sciences and Technologies Shiraz University of Medical Sciences Shiraz Iran Critical Care Nursing Nursing and Midwifery School Islamic Azad University Kazerun Branch Kazerun Iran Department of Tissue Engineering and Applied Cell Sciences School of Advanced Medical Sciences and Technologies Shiraz University of Medical Sciences Shiraz Iran The Persian Gulf Nuclear Medicine Research Center Bushehr Medical University Hospital School of Medicine Bushehr University of Medical Sciences Bushehr Iran Department of Materials Science and Engineering School of Engineering Shiraz University Zand Blvd. Shiraz*** Iran Shiraz Endocrinology and Metabolism Research Center Shiraz University of Medical Sciences Shiraz Iran Department of Materials Science and Engineering Shiraz University of Technology Shiraz Iran Department of Biomaterials Saveetha Dental College and Hospital Saveetha Institute of Medical and Technical Sciences Chennai600 077 India The KU-KIST Graduate School of Energy and Environment Korea University 145 Anam-ro Seongbuk-Gu Seoul02841 Korea Republic of Universidad UTE Quito170527 Ecuador Department of Smart Engineering and Advanced Technology Faculty of Artificial Intelligence Universiti Teknologi Malaysia Jalan Sultan Yahya Petra Kuala Lumpur54100 Malaysia Instituto de Alta Investigacion Universidad de Tarapacá Arica1000000 Chile Quito170527 Ecuador

Recently, MXenes have garnered significant attention in academic research due to their remarkable structural, electrical, magnetic, optical, mechanical, and chemical properties. New advancements and emerging findings indicate that MXene, classified as a two-dimensional (2D) layered material, exhibits significantly more potential in the field of biomedicine and biotechnology compared to existing nanosystems. These applications include acting as antibacterial agents, biosensor systems, the delivery and loading of drugs, bioimaging, and therapeutic interventions. The unique characteristics of MXenes, such as their significant electrical conductivity, large surface area, low toxicity, magnetism, luminescence, and high biocompatibility, make them highly promising candidates for diagnostic, therapeutic, and theranostic applications. Surface modifications of MXenes exhibit biocompatibility and have multifunctional functions, including the ability to direct ligands towards specific spots for preferential aggregation, hence enabling their utilization in specialized applications. This paper provides an overview of the characteristics, modifications, and synthesis methods of MXene nanomaterials. The present article also delivers a comprehensive assessment of the practical uses of MXene-based nanomaterials in biomedicine, with a particular focus on biosensing, bioimaging, antibacterial effects, implants, and multifunctional therapeutic platforms. This paper also presents a discussion of the future prospects and challenges associated with the applications of MXenes in the biomedicine field. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Biocompatibility

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Recent Progress in MXene‑Based Materials for Metal‑Sulfur and Metal‑Air Batteries:Potential High‑Performance Electrodes

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Electrochemical Energy Reviews 2022年第1期5卷 112-144页

作者： Anmin Liu Xingyou Liang Xuefeng Ren Weixin Guan Tingli Ma State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Ocean Science and Technology Dalian University of TechnologyPanjin 124221LiaoningChina Department of Materials Science and Engineering ChinaJiliang UniversityHangzhou 310018ZhejiangChina Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology2‑4 HibikinoWakamatsuKitakyushuFukuoka 808‑0196Japan

Rechargeable batteries,which are used for renewable energy storage,have paved the way for reducing the enormous pressure of the energy crisis and environmental ***,promising electrode materials with high energy and power density and favorable electrochemical performance for energy conversion and storage have been developed to meet the ever-growing demand for renewable power for electric vehicles or grid ***,which constitute an impressive two-dimensional transition metal carbide/carbonitride family,exhibit great energy storage potential based on their ideal specific surface area,excellent electrical conductivity,and superior chemical durability in *** recent advances in MXenes and their composites for metal-sulfur batteries(specifically lithium-sulfur and sodium-sulfur batteries)and metal-air batteries(specifically lithium-air and zinc-air batteries)are comprehensively and systematically summarized in this ***,the performance management strategies,next-stage research prospects,and remaining practical challenges for MXene-based materials in battery applications are discussed in *** review may provide some guidance for the development and application of MXene-based electrode materials in renewable electrochemical energy storage.

关键词： MXene Metal-sulfur batteries Metal-air batteries Electrode

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control of Magnetization Precession Frequency Using Current Density of Spin-Orbit Torque Applied to Local Area

Control of Magnetization Precession Frequency Using Current ...

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

作者： Koda, Tetsunori Nakagawa, Ao Muroga, Sho Endo, Yasushi Oshima College National Institute of Technology Department of Electronic Mechanical Engineering Suo-Oshima742-2193 Japan Akita University Graduate School of Engineering Science Department of Mathematical Science and Electrical-Electronic-Computer Engineering Akita010-8502 Japan Department of Electrical Engineering Graduate School of Engineering Tohoku University Sendai980-8579 Japan Center for Spintronics Research Network Tohoku University Sendai980-8577 Japan Organization for Advanced Studies Tohoku University Sendai980-8577 Japan

ISBN: (纸本)9798350338362

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. © 2023 IEEE.

关键词： Spin waves

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Information Presentation Strategies to Promote Pedestrian Behavior Change in Mixed Spaces with Automated Vehicle

Information Presentation Strategies to Promote Pedestrian Be...

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2024 IEEE/SICE International Symposium on System Integration, SII 2024

作者： Nishiura, Yuki Yamada, Hiroyuki Kurazume, Ryo Graduate School of Information Science and Electrical Engineering Kyushu University Japan Center for Sustainability - Connective Automation Hitachi Ltd. Research and Development Group Autonomous Control Research Department Ibaraki312-0034 Japan Kyushu University Faculty of Information Science and Electrical Engineering Fukuoka819-0395 Japan

ISBN: (纸本)9798350312072

This paper introduces an information presentation strategy for pedestrians, aiming to enhance traffic efficiency in a mixed pedestrian-automated vehicle environment, such as a public road. While automated driving technology has made remarkable progress, interactions with pedestrians on regular roads have mostly been studied in virtual environments using virtual reality goggles. According to these studies, potential traffic efficiency and safety issues arise from pedestrians' limited understanding of automated vehicle behavior. To address this, we propose a human-machine interface employing a head-mounted display (HMD) to mitigate traffic efficiency degradation caused by pedestrians. The proposed system draws upon behavioral economics principles to encourage pedestrians to modify their behavior and develop better interactions with automated vehicles. Simulations were conducted to identify an information presentation strategy that strongly supports learning, and its effectiveness was further validated through experiments involving a real vehicle. Notably, the experimental results confirmed that the information presentation strategies proven effective in simulations also facilitated pedestrian learning during real-world interactions. © 2024 IEEE.

关键词： Virtual reality

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Growth and magnetoelectric effect of epitaxial Co3Mn films on piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3(001)

Growth and magnetoelectric effect of epitaxial Co3Mn films o...

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

作者： Murakami, Yuichi Usami, Takamasa Shiratsuchi, Yu Sanada, Yuya Yamada, Shinya Nakatani, Ryoichi Hamaya, Kohei Osaka University Graduate School of Engineering Science Department of Systems Innovation Osaka Toyonaka560-8531 Japan Osaka University Center for Spintronics Research Network Graduate School of Engineering Science Osaka Toyonaka560-8531 Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Suita565-0871 Japan Spintronics Research Network Division Institute for Open and Transdisciplinary Research Initiatives Osaka University Osaka Suita565-0871 Japan

ISBN: (纸本)9798350338362

We explore epitaxial growth of metastable ferromagnetic Co3Mn films on piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 (001) (PMN-PT) substrates by molecular beam epitaxy. By tuning the termination of the PMN-PT surface and the growth temperature, thermodynamically metastable bcc and stable fcc/hcp phases can be distinctively formed. We find that the bcc-Co3Mn/PMN-PT structure expresses a relatively large converse magnetoelectric (CME) coupling coefficient (αE) of 8 × 10-6 s/m while the fcc/hcp-Co3Mn/PMN-PT one shows a small value less than 1 × 10-6 s/m. This provides a possibility for achieving simultaneous demonstration of large CME effect and tunneling magnetoresistance one. © 2023 IEEE.

关键词： Binary alloys

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Design and Implementation of a Wide-Swing CMOS Multiplier for AC Source Signal Tracking and Modulation

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Circuits, systems, and Signal Processing 2024年第9期43卷 5377-5400页

作者： Wang, Wei Xu, Sendren Sheng-Dong Chen, Chi-Lin Chiu, Huang-Jen Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei 106335 Taiwan Graduate Institute of Automation and Control National Taiwan University of Science and Technology Taipei 106335 Taiwan Advanced Manufacturing Research Center National Taiwan University of Science and Technology Taipei 106335 Taiwan Himax Technologies Inc. Taipei 100507 Taiwan

The multiplier is a pervasive critical component today. However, most of them are difficult to be integrated into an integrated circuit. In this study, we proposed a novel analog multiplier for AC power application, using CMOS process to realize the analog voltage multiplication function of double-ended input and single-ended output. Under the working voltage of 3.3 V, the multiplier can operate with a wide input voltage range of 0–1.6 V (about 48.8% of the working voltage) and a wide output voltage range of 0–2.56 V (about 77.5% of the working voltage). The multiplier is implemented through the current difference between two NMOSs operating in the linear region and the saturation region, respectively. Compared with the existing technique, the proposed analog multiplier has a wider input and output range, and better linearity. It is suitable for AC power signal tracking and modulation. Finally, the United Microelectronics Corporation 0.18 μm 1P4M CMOS standard process was used for physical implementation. Moreover, there is not any BJT or special device used. It was measured that the analog multiplier circuit consumes about 0.56 mW at a working voltage of 3.3 V. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： AC power signal modulation AC source signal tracking Analog integrated circuit (IC) design Analog multipliers Circuits and systems

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A Study of Trot Gait control System of a Quadruped Robot Using IMU Sensor 61

A Study of Trot Gait Control System of a Quadruped Robot Usi...

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61st Annual Conference of the Society of Instrument and control Engineers of Japan, SICE 2022

作者： Mori, Kimihiro Ohkubo, Tomoyuki Kobayashi, Kazuyuki Watanabe, Kajiro Tian, Kaiqiao Sebi, Nashwan J. Cheok, Ka C. Hosei University Graduate School of Science and Engineering Tokyo Japan Advanced Institute of Industrial Technology Tokyo Japan Oakland University School of Engineering & Computer Science Electrical & Computer Engineering Department RochesterMI United States

ISBN: (数字)9784907764784

ISBN: (纸本)9784907764784

This paper describes a stable trot gait control system for a quadruped robot that enables faster walking with stability. Compared to other gait types, it is possible to walk faster with relatively little energy expenditure, which means trot gait is suitable to control for the quadruped robot. However, trot gait does not prevent roll and pitch angle fluctuations, essentially, even when walking on flat terrain, because two legs temporarily support the robot body. Therefore, to suppress the effect of this fluctuation and stabilize the posture of the robot body, we proposed a trot gait control system using an IMU sensor and achieved faster walking without slipping. To confirm the validity of the proposed stable trot gait control system, we built a quadruped robot based on TurtleBot3 chassis and implement our system. To validate the system's effectiveness, we carried out several experiments running on various types of terrain, including sloping terrain. © 2022 The Society of Instrument and control Engineers - SICE.

关键词： control systems

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Energy polarization and energy pumping in Rice-Mele chains

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Physical Review B 2023年第11期107卷 115401-115401页

作者： Kiminori Hattori Kodai Ishikawa Yuma Kaneko Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan

The one-dimensional Rice-Mele lattice consisting of two-site unit cells enables topological charge pumping at low enough temperatures. We show here that energy pumping is feasible in this system. We analyze energy polarization using the second-quantization formalism and connect it to intercell energy current by the relevant continuity equation. Following this formulation, we numerically evaluate the energy current pumped in an adiabatic cycle when the system parameters vary periodically and slowly with time. Unlike the pumped charge, the pumped energy is entirely temperature independent at half-filling. The global Berry phase for all bands and the related topological phase transitions during the pumping cycle account for the energy pumping. The present paper paves the way for manipulating energy current without electric and thermal biases.

关键词： Quantum transport Topological insulators Topological phases of matter 1-dimensional systems

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