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arXiv 2023年

作者： Tsumura, Kohji Matsuura, Shuji Sano, Kei Iwata, Takahiro Yano, Hajime Kitazato, Kohei Takimoto, Kohji Yamada, Manabu Morota, Tomokatsu Kouyama, Toru Hayakawa, Masahiko Yokota, Yasuhiro Tatsumi, Eri Matsuoka, Moe Sakatani, Naoya Honda, Rie Kameda, Shingo Suzuki, Hidehiko Cho, Yuichiro Yoshioka, Kazuo Ogawa, Kazunori Shirai, Kei Sawada, Hirotaka Sugita, Seiji Department of Natural Sciences Faculty of Science and Engineering Tokyo City University Tokyo158-8557 Japan Department of Physics School of Science and Technology Kwansei Gakuin University Hyogo669-1337 Japan Department of Space Systems Engineering School of Engineering Kyushu Institute of Technology Fukuoka804-8550 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa252-5210 Japan Department of Space and Astronautical Science The Graduate University of Advanced Studies Kanagawa240-0193 Japan Department of Computer Science and Engineering The University of Aizu Fukushima965-8580 Japan Planetary Exploration Research Center Chiba Institute of Technology Chiba275-0016 Japan Department of Earth and Planetary Science University of Tokyo Tokyo113-0033 Japan Digital Architecture Research Center National Institute of Advanced Industrial Science and Technology Tokyo135-0064 Japan Instituto de Astrofisica de Canarias University of La Laguna Tenerife Spain Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Ibaraki305-8567 Japan Center for Data Science Ehime University Ehime790-8577 Japan Rikkyo University Tokyo171-8501 Japan Meiji University Kanagawa214-8571 Japan Department of Complexity Science and Engineering University of Tokyo Chiba277-8561 Japan JAXA Space Exploration Center Japan Aerospace Exploration Agency Kanagawa252-5210 Japan Kobe University Hyogo657-8501 Japan

Zodiacal light (ZL) is sunlight scattered by interplanetary dust particles (IDPs) at optical wavelengths. The spatial distribution of IDPs in the Solar System may hold an important key to understanding the evolution of the Solar System and material transportation within it. The number density of IDPs can be expressed as n(r) ∼ r−α, and the exponent α ∼ 1.3 was obtained by previous observations from interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of α based on ZL observations from interplanetary space outside Earth’s orbit have been performed since then. Here, we introduce initial results for the radial profile of the ZL at optical wavelengths observed over the range 0.76-1.06 au by ONC-T aboard the Hayabusa2# mission in 2021-2022. The ZL brightness we obtained is well reproduced by a model brightness, although there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The radial power-law index we obtained is α = 1.30 ± 0.08, which is consistent with previous results based on ZL observations. The dominant source of uncertainty arises from the uncertainty in estimating the diffuse Galactic light (DGL). © 2023, CC BY.

关键词： Orbits

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Flexible no-drift data glove using ultrathin silicon for the metaverse

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Device 2025年第5期3.0卷

作者： Takamatsu, Seiichi Takakuwa, Masahito Fukuda, Kenjiro Yamamoto, Michitaka Tomita, Naoto Liu, Hao Kobayashi, Takeshi Yokota, Tomoyuki Someya, Takao Itoh, Toshihiro Department of Precision Engineering of Engineering The University of Tokyo 7-3-1 Hongo Tokyo Bunkyo-ku 113-8656 Japan Institute of Engineering Innovation of Engineering The University of Tokyo 7-3-1 Hongo Tokyo Bunkyo-ku 113-8656 Japan Department of Electrical and Electronic Engineering and Information Systems of Engineering The University of Tokyo 7-3-1 Hongo Tokyo Bunkyo-ku 113-8656 Japan Thin-Film Device Laboratory RIKEN 2-1 Hirosawa Saitama Wako 351-0198 Japan Center for Emergent Matter Science RIKEN 2-1 Hirosawa Saitama Wako 351-0198 Japan Sensing System Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8564 Japan

The ideal bending sensors should be able to accurately measure finger movements and maintain consistent sensitivity after repeated use. Existing bending sensors have problems with the time-dependent drift of the sensor output and the sensitivity decreasing over time because of the viscoelasticity of the adhesive and film in the sensors. Here, we present a flexible piezoresistive strain sensor made of ultrathin 5-μm silicon (Si), attached to a 2-μm-thick parylene substrate with Au wiring using water-vapor-plasma-assisted Au–Au direct bonding to eliminate the intrinsic viscoelastic effects of the adhesive and film. The sensor shows no noticeable drift or degradation after 10,000 bending cycles. © 2025 The Authors

关键词： bending sensor direct bonding DTI-3: Develop flexible electronics hybrid electronics parylene silicon silicon sensor ultrathin virtual reality

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A Framework of Cloud-Edge Collaborated Digital Twin for Flexible Job Shop Scheduling with Conflict-Free Routing

SSRN

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SSRN 2023年

作者： Gao, Qianfa Fu, G.U. Li, Linli Guo, Jianfeng State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou310027 China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical Engineering Zhejiang University Hangzhou310027 China Department of Industrial and System Engineering Zhejiang University Hangzhou310027 China National Institute of Innovation Management Zhejiang University Hangzhou310015 China Center of Engineering Management Polytechnic Institute Zhejiang University Hangzhou310015 China School of Public Policy and Management University of Chinese Academy of Sciences Beijing100049 China Institutes of Science and Development Chinese Academy of Sciences Beijing100190 China

Synchronous scheduling of automated guided vehicles (AGVs) and production resources can effectively improve the productivity of automated flexible job shop, but limited transportation resources and persistent abnormal disturbance compromise the accuracy and reliability of such scheduling. To address the flexible job shop scheduling problem with limited transportation resources (FJSP-T) under abnormal disturbance, in this article we establish a time-space network based zero-one programming (TSN-ZOP) model to optimize makespan, and propose a cloud-edge combined digital twin flexible job shop scheduling (CE-DTFJSS) framework to realize real-time scheduling. In this framework, a digital twin (DT) system is employed, and a cloud-edge architecture is introduced to allocate computing resources for scheduling-supporting tasks including DT simulation, state monitoring, and transportation perception. Specifically, we develop a cloud edge collaboration rescheduling strategy based on rolling window, to update the parameters of scheduling from real-time data and to execute real-time scheduling optimization. To realize scheduling and conflict-free routing planning simultaneously, a multi-layer coding evolutionary algorithm nested time window Dijkstra is adopted as a solution approach. The effectiveness and efficiency of CE-DTFJSS are verified by a numeric simulation based on a real case of automobile welding workshop. The simulation results show that compared with the scheduling scheme without considering AGVs routing problem, CE-DTFJSS can reduce makespan by 7.11%, and real-time scheduling can be achieved in 0.1 seconds. © 2023, The Authors. All rights reserved.

关键词： Automatic guided vehicles

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Fracture process analysis of notched brittle Metal based on mesoscopic plastic information Oriented to propose mechanism-based strength evaluation Methods;Example of Gray-Cast iron FC200

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engineering Failure Analysis 2025年

作者： Toyomitsu Harada Hiroshi noguchi Daisuke Sasaki Yuta Minami Takashi Yoshida Nobuya Sasaguri Department of Mechanical Engineering National Institute of Technology Kurume College 1-1-1 Komorino Kurume Fukuoka 830-8555 Japan Department of Mechanical Engineering Faculty of Engineering Kyushu University 744 Moto-oka Nishi-ku Fukuoka 819-0395 Japan Department of Materials System Engineering National Institute of Technology Kurume College 1-1-1 Komorino Kurume Fukuoka 830-8555 Japan Mechanical and Electrical Systems Engineering Advanced Course National Institute of Technology Kurume College1-1-1 Komorino Kurume Fukuoka 830-8555 Japan

A more rational characterization method for the strength of notched materials of heterogeneous brittle metals is desired than the present method without considering the real material behavior. This study aims to analyze the role of local plastic strain in the fracture process in notched brittle metals. In this study, we therefore conducted a four-point bending fracture test on gray cast iron with a semi-circular notch and performed fractography analysis of the fractured surfaces using an electron microscope and plastic strain analysis near the fractured surfaces using Electron BackScatter Diffraction. Based on the results, a model was proposed for the crack initiation and stable crack propagation mechanisms those clarified the role of the material structure and plastic strain on the crack behavior. This model divided the crack behavior into three stages. The first and second stages corresponded to the normal fracture process zone, wherein strain from the structure was the main cause of the crack propagation; however, in the third stage, the main cause was the elastic energy, which expressed the material as a continuum.

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A Study on Relationship Between Consumer Review Behavior and Purchasing in EC site

A Study on Relationship Between Consumer Review Behavior and...

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IIAI International Conference on advanced Applied Informatics (IIAIAAI)

作者： Miyuji Yoshida Tomoaki Tabata Takaaki Hosoda Tokai University Course of Information and Telecommunication Engineering Tokyo Japan Tokai University Tokyo Japan Information Systems Architecture Advanced Institute of Industrial Technology Tokyo Japan

ISBN: (纸本)9781728173986

Based on the product review after purchase, the information of the transition from the abstract purchasing intention close to the potential desire to the specific purchase intention and the repeated purchase of the product after the purchase is structured, and the reason why the person writing the review leads to the repurchase is analyzed.

关键词： Writing Informatics

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Durability Performance Testing of SiC Diodes for use as Bypass Diodes in Photovoltaic Modules

Durability Performance Testing of SiC Diodes for use as Bypa...

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2020 47th IEEE Photovoltaic Specialists Conference (PVSC)

作者： Toshiyuki Hamada Takumi Kashiwaya Shinnosuke Yoneda Kenta Nakamoto National Institute of Technology Ube College Ube Yamaguchi Japan Advanced Course of Production Systems Engineering National Institute of Technology Ube College Ube Yamaguchi Japan Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan

ISBN: (数字)9781728161150

ISBN: (纸本)9781728161167

When a bypass diode (BPD), which is a protective element in the photovoltaic module, fails owing to a short circuit, the faulty BPD generates heat, creating a risk of burnout. In this study, durability tests were conducted simulating the use of three different types of diode-silicon Schottky barrier diode (Si-SBD), PN junction diode (PND), and silicon carbide SBD (SiC-SBD)-as BPDs to investigate the specifications of diodes suitable for use as BPDs. The PND and SiC-SBD models, which have a large forward voltage drop, generated a large amount of heat, and the SiC-SBD model suffered thermal failure at approximately 10 cycles. However, all the diodes exceeded the junction temperature during testing. This reveals the need to implement heat dissipation measures to improve the long-term durability of BPDs.

关键词： Schottky diodes Surges Schottky barriers Photovoltaic systems Temperature measurement Circuit faults Lightning

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Improvement of sampling inspection for wire bonding using thin AE sensor and transfer learning

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Journal of Japan institute of Electronics Packaging 2019年第3期22卷 209-217页

作者： Koishi, Yasutake Ishida, Shuichi Tabaru, Tatsuo Iwasaki, Wataru Miyamoto, Hiroyuki Life Science and Systems Engineering Kyushu Institute of Technology 2-4 Hibikino Wakamatsu-ku Kitakyushu-shi Fukuoka808-0196 Japan Advanced Manufacturing Research Institute National Institute of Advanced Industrial Science and Technology 807-1 Shuku-machi Tosu-shi Saga841-0052 Japan

Wire bonding is an important process in semiconductor manufacturing. The quality of wire bonding is guaranteed by destructive sampling inspection. However, sampling inspection is not able to detect defective products that occur non-systematically. Therefore, it is desirable to shift to inspection of each part. In this paper, we propose an inspection method based on the wire bonding state using a Thin-film AE sensor and transfer learning. We place the thin film AE sensor in the immediate vicinity of the bonding junction and measure the applied AE wave. We improve the quality determination performance in the sampling inspection by determining the quality from the measured AE waves using the transfer learning method we developed. We applied the proposed method to experiment using actual bonding samples and confirmed that it showed a 10.7% higher quality determination ability than sampling inspection. © 2019 Japan institute of Electronics Packaging. All rights reserved.

关键词： Thin films

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Automatic Pavement Crack Detection using Multi-Scale Image Neighborhoods Information

Automatic Pavement Crack Detection using Multi-Scale Image N...

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2019 International Conference on Mechatronics, Robotics and systems engineering, MoRSE 2019

作者： Komori, Taiki Matsushima, Kousuke Takahashi, Osamu Advanced Engineering Course National Institute of Technology Kurume College Fukuoka Japan National Institute of Technology Kurume College Department of Control and Information Systems Engineering Fukuoka Japan Nagaoka University of Technology Department of Civil and Environmental Engineering Niigata Japan

ISBN: (纸本)9781728139845

Pavement cracks are dangerous because they can cause accidents such as tire punctures, slips, and collapses. Therefore, it is necessary to repair them properly. In recent years, various crack detection methods using pavement images have been proposed. However, in many cases, there are problems with accuracy and processing time. In this paper, we propose a new crack detection method using multi-scale image and neighborhood information. Experimental results show that the proposed method is superior to the most advanced crack detection methods in both accuracy and processing time. © 2019 IEEE.

关键词： Crack detection

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Enhanced Visual Feedback with Decoupled Viewpoint Control in Immersive Humanoid Robot Teleoperation using SLAM

Enhanced Visual Feedback with Decoupled Viewpoint Control in...

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IEEE-RAS International Conference on Humanoid Robots

作者： Yang Chen Leyuan Sun Mehdi Benallegue Rafael Cisneros-Limón Rohan P. Singh Kenji Kaneko Arnaud Tanguy Guillaume Caron Kenji Suzuki Abderrahmane Kheddar Fumio Kanehiro School of Integrative and Global Majors (SIGMA) University of Tsukuba Japan CNRS-AIST JRL (Joint Robotics Laboratory) IRL National Institute of Advanced Industrial Science and Technology (AIST) Department of Intelligent and Mechanical Interaction Systems Graduate School of Science and Technology University of Tsukuba Japan MIS lab Universite de Picardie Jules Verne Amiens France Faculty of Engineering and Center for Cybernetics Research University of Tsukuba Japan

ISBN: (数字)9798350309799

ISBN: (纸本)9798350309805

In immersive humanoid robot teleoperation, there are three main shortcomings that can alter the transparency of the visual feedback: (i) the lag between the motion of the operator's and robot's head due to network communication delays or slow robot joint motion. This latency could cause a noticeable delay in the visual feedback, which jeopardizes the embodiment quality, can cause dizziness, and affects the interactivity resulting in operator frequent motion pauses for the visual feedback to settle; (ii) the mismatch between the camera's and the headset's field-of-views (FOV), the former having generally a lower FOV; and (iii) a mismatch between human's and robot's range of motions of the neck, the latter being also generally lower. In order to leverage these draw-backs, we developed a decoupled viewpoint control solution for a humanoid platform which allows visual feedback with low-latency and artificially increases the camera's FOV range to match that of the operator's headset. Our novel solution uses SLAM technology to enhance the visual feedback from a reconstructed mesh, complementing the areas that are not covered by the visual feedback from the robot. The visual feedback is presented as a point cloud in real-time to the operator. As a result, the operator is fed with real-time vision from the robot's head orientation by observing the pose of the point cloud. Balancing this kind of awareness and immersion is important in virtual reality based teleoperation, considering the safety and robustness of the control system. An experiment shows that the effectiveness of our solution.

关键词： Point cloud compression Visualization Simultaneous localization and mapping Humanoid robots Virtual reality Real-time systems Robustness

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Crack Detection using Spectral Clustering: Self-Tuning Considering Crack Feature and Connections

Crack Detection using Spectral Clustering: Self-Tuning Consi...

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2019 International Conference on Mechatronics, Robotics and systems engineering, MoRSE 2019

作者： Shiotsuka, Daiki Matsushima, Kousuke Takahashi, Osamu Advanced Engineering Course National Institute of Technology Kurume College Kurume Japan National Institute of Technology Kurume College Department of Control and Information Systems Engineering Kurume Japan Nagaoka University of Technology Department of Civil and Environmental Engineering Nagaoka Japan

ISBN: (纸本)9781728139845

Cracks on the pavement road cause various traffic problems. Hence, we should repair them properly. Nowadays, there are a variety of crack detection method based on computer vision for operation efficiency. Spectral Clustering is one of them and effective. However, detection accuracy may decrease depending on the image because roads often have many bumps. In this paper, we cluster images having less noise into two clusters, while noisy images into three clusters. The number of clusters is determined automatically by considering the relationship between crack feature and the number of connections. © 2019 IEEE.

关键词： Pavements

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