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

作者： Katsutani, Yuki Noda, Kohei Shirahata, Takuma Yamashita, Shinji Set, Sze Yun Department of Electrical Engineering and Information Systems The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Research Centre for Advanced Science and Technology The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8904 Japan

By attributing optical correlation-domain reflectometry to a linear problem, the measurement range is greatly extended. In addition, the data volume of reflectance distribution was successfully reduced by using compre... 详细信息

关键词： Optical depth

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An Intelligent Deterministic Scheduling Method for Ultralow Latency Communication in Edge Enabled Industrial Internet of Things

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IEEE Transactions on Industrial Informatics 2023年第2期19卷 1756-1767页

作者： Lu, Yinzhi Yang, Liu Yang, Simon X. Hua, Qiaozhi Sangaiah, Arun Kumar Guo, Tan Yu, Keping School of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China Advanced Robotics and Intelligent Systems Laboratory School of Engineering University of Guelph GuelphONN1G2W1 Canada Computer School Hubei University of Arts and Science Xiangyang441000 China Future Technology Research Center National Yunlin University of Science and Technology Douliu City64002 Taiwan Graduate School of Science and Engineering Hosei University Tokyo184-8584 Japan Riken Center for Advanced Intelligence Project Riken Tokyo103-0027 Japan

Edge enabled Industrial Internet of Things (IIoT) platform is of great significance to accelerate the development of smart industry. However, with the dramatic increase in real-time IIoT applications, it is a great challenge to support fast response time, low latency, and efficient bandwidth utilization. To address this issue, time sensitive network (TSN) is recently researched to realize low latency communication via deterministic scheduling. To the best of our knowledge, the combinability of multiple flows, which can significantly affect the scheduling performance, has never been systematically analyzed before. In this article, we first analyze the combinability problem. Then, a noncollision theory based deterministic scheduling (NDS) method is proposed to achieve ultralow latency communication for the time-sensitive flows. Moreover, to improve bandwidth utilization, a dynamic queue scheduling (DQS) method is presented for the best-effort flows. Experiment results demonstrate that NDS/DQS can well support deterministic ultralow latency services and guarantee efficient bandwidth utilization. © 2005-2012 IEEE.

关键词： Bandwidth

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Human-Robot Interaction through an Object Grasped with Two Fingers Based on Plastic Deformation Control

Human-Robot Interaction through an Object Grasped with Two F...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Senoo, Taku Konno, Atsushi Kawahara, Hiromichi Ishii, Idaku Course of Systems Science and Informatic Graduate School of Information Science and Technology Hokkaido University Kita 14 Nishi 9 Kita-ku Sapporo Hokkaido060-0814 Japan Smart Innovation Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8527 Japan

ISBN: (纸本)9781665481090

In this study, two-finger grasping based on plastic deformation control for human-robot interaction is designed and implemented. This control strategy is derived based on the concept that balances both retention of grasping force on objects and plastic behavior in response to external forces. The control law consists of a set of constraints and offsets with respect to the springs that appear in the Maxwell model. In particular, the inner loop that is robust against parameter errors is implemented for actual machine experiments. Simulation and actual experiments with a robotic hand are executed to validate the proposed control law. © 2024 IEEE.

关键词： Human robot interaction

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Super-Resolution of Optical Thickness Measurement employing Correlation-based Spectrum Estimation

Super-Resolution of Optical Thickness Measurement employing ...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Yamaguchi, Naoki Yamauchi, Takanori Kitamura, Takayuki Imaki, Masaharu Yamashita, Shinji Set, Sze Yun Research Center for Advanced Science and Technology The Univ. of Tokyo Komaba 4-6-1 Meguro Tokyo153-8904 Japan Information Technology R&D Center Mitsubishi Electric Corporation Ofuna 5-1-1 Kanagawa Kamakura247-8501 Japan Dept. of Electrical Engineering and Information Systems The Univ. of Tokyo Hongo 7-3-1 Bunkyo Tokyo113-8656 Japan

ISBN: (纸本)9781957171395

The quantification of optical thickness using a wavelength swept source is pivotal for applications such as Swept Source Optical Coherence Tomography (SS-OCT) and Frequency-Modulated Continuous-Wave (FMCW) lidar, demanding sub-millimeter range resolution. To enhance resolution, we advocate the incorporation of a correlation-based spectrum estimation method in FMCW optical thickness measurement. Our approach successfully resolved a notable 0.59 mm of thickness with a 1.7 nm wavelength sweep, surpassing the 0.61 mm theoretical limit imposed by Fourier transform. © Optica Publishing Group 2024 © 2024 The Author(s)

关键词： Thickness measurement

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Realizing high thermoelectric performance via selective resonant doping in oxyselenide BiCuSeO

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Nano Research 2023年第1期16卷 1679-1687页

作者： Yue-Xing Chen Wenning Qin Adil Mansoor Adeel Abbas Fu Li Guang-xing Liang Ping Fan Muhammad Usman Muzaffar Bushra Jabar Zhen-hua Ge Zhuang-hao Zheng F1 Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China International Center for Quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at Microscale(HFNL)and CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Tuning the charge carrier concentration is imperative to optimize the thermoelectric(TE)performance of a *** BiCuSeO based oxyselenides,doping efforts have been limited to optimizing the carrier *** the present work,dual-doping of In and Pb at Bi site is introduced for p-type BiCuSeO to realize the electric transport channels with intricate band characteristics to improve the power factor(PF).Herein,the impurity resonant state is realized via doping of resonant dopant In over Pb,where Pb comes forward to optimize the Fermi energy in the dual-doped BiCuSeO system to divulge the significance of complex electronic *** manifold roles of dual-doping are used to adjust the elevation of the PF due to the significant enhancement in electrical ***,the combined experimental and theoretical study shows that the In/Pb dual doping at Bi sites gently reduces bandgap,introduces resonant doping states with shifting down the Fermi level into valence band(VB)with a larger density of state,and thus causes to increase the carrier concentration and effective mass(m*),which are favorable to enhance the electronic transport *** a result,both improved ZTmax=0.87(at 873 K)and high ZTave=0.5(at 300–873 K)are realized for InyBi(1−x)−yPbxCuSeO(where x=0.06 and y=0.04)*** obtained results successfully demonstrate the effectiveness of the selective dual doping with resonant dopant inducing band manipulation and carrier engineering that can unlock new prospects to develop high TE materials.

关键词： thermoelectric material BiCuSeO dual-doping power factor figure of merit

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Auditory indication system for object-finding in remote collaborative assistance 14

Auditory indication system for object-finding in remote coll...

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14th Asia-Pacific Workshop on Mixed and Augmented Reality, APMAR 2022

作者： Komoda, Takayuki Utsumi, Fumina Yamada, Takayoshi Zempo, Keiichi Graduate School of Science and Technology University of Tsukuba 1-1-1 Tennodai 3058573 Japan College of Engineering Systems University of Tsukuba 1-1-1 Tennodai 3058573 Japan Faculty of Engineering Information and Systems University of Tsukuba 1-1-1 Tennodai 3058573 Japan

In this paper, we propose a remote collaboration system to assist the person with visually impaired in object-finding. The system consists of a 360-degree image centering on a person with visually impaired and presented as a panoramic image on the PC screen of a supporter in a remote location. By clicking on the PC screen, the supporter can present the AR audio (auditory indicator) superimposed on the real space that the person with visually impaired perceives, using spatial sounds. Auditory indicator enables the person with visually impaired to understand the location of the object intuitively. We conducted experiments to clarify the effect of the proposed system on the performance time of the object-finding task and the phrases of the supporters. The results of the experiment showed that the auditory indicator enabled the supporter to guide the simulated person with visually impaired by using demonstrative pronouns such as "this" and "here". © 2022 Copyright for this paper by its authors.

关键词： Augmented reality

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Design and System Integration of Table Tennis Ball-Collecting Robot

Design and System Integration of Table Tennis Ball-Collectin...

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

作者： Sato, Tsutomu Irie, Kiyoshi Takaishi, Shinya Kawamoto, Hiroaki Tsukuba Table Tennis Tech Research Group Tennodai 1-1-1 Ibaraki Tsukuba Japan Chiba Institute of Technology Future Robotics Technology Center Tsudanuma 2-17-1 Chiba Narashino Japan Graduate School of Science Tohoku University Department of Chemistry Miyazaki Japan Institute of Systems and Information Engineering Center for Cybernics Research University of Tsukuba Tennodai 1-1-1 Ibaraki Tsukuba Japan

ISBN: (纸本)9798350312072

In the world of table tennis, practices often involve the use of numerous balls, making post-practice collection a tedious and time-consuming task. To address this challenge, we present an autonomous robot tailored for table tennis ball collection. This robot features a differential-drive wheeled platform, a unique ball collection mechanism using rotating elastic blades, an on-board RGB camera, and a single board computer for data processing. Balls are detected using a deep learning algorithm, allowing the robot to autonomously navigate the closest ball and collect it. Under a consistently controlled environment, including a limited field size and a set number of balls, experiments were conducted to evaluate the robot's core functions and performance clearly. Experimental results revealed that despite employing a straightforward operational algorithm, the robot demonstrated performance comparable to human-operated remote collection in terms of speed and accuracy. Importantly, this study uniquely focuses not on maximizing efficiency but rather on establishing a baseline for future research in this area, setting a benchmark for future studies. Furthermore, our findings provide the foundation for enhancing ball-collecting robots in table tennis settings. © 2024 IEEE.

关键词： Robots

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Efficient and robust missing key tag identification for large-scale RFID systems

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Digital Communications and Networks 2023年第6期9卷 1421-1433页

作者： Chu Chu Guangjun Wen Jianyu Niu School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu611731China Research Institute of Trustworthy Autonomous Systems Southern University of Science and TechnologyShenZhen518055China School of Engineering The University of British ColumbiaKelownaV1V 1V7BCCanada

Radio Frequency Identification(RFID)technology has been widely used to identify missing *** many applications,rapidly pinpointing key tags that are attached to favorable or valuable items is *** realize this goal,interference from ordinary tags should be avoided,while key tags should be efficiently *** many previous studies,how to rapidly and dynamically filter out ordinary tags when the ratio of ordinary tags changes has not been ***,how to efficiently verify missing key tags in groups rather than one by one has not been explored,especially with varying missing *** this paper,we propose an Efficient and Robust missing Key tag Identification(ERKI)protocol that consists of a filtering mechanism and a verification ***,the filtering mechanism adopts the Bloom filter to quickly filter out ordinary tags and uses the labeling vector to optimize the Bloom filter's performance when the key tag ratio is ***,the verification mechanism can dynamically verify key tags according to the missing rates,in which an appropriate number of key tags is mapped to a slot and verified at ***,we theoretically analyze the parameters of the ERKI protocol to minimize its execution *** numerical results show that ERKI can accelerate the execution time by more than 2.14compared with state-of-the-art solutions.

关键词： RFID Missing key tag identification Time efficiency Robust

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Avalanche UTC Photodetector Using InAlAs Collection Layer at High Frequency Range

Avalanche UTC Photodetector Using InAlAs Collection Layer at...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Yi, Yaofeng Duan, Siyang Umezawa, Toshimasa Akahane, Kouichi Kawanishi, Tetsuya Department of Electronic and Physical Systems School of Fundamental Science and Engineering Waseda University Japan National Institute of Information and Communications Technology 4-2-1 Nukui-Kitamachi Koganei Tokyo184-8795 Japan

We propose a novel avalanche uni-traveling-carrier type photodetector (UTC-PD) using InAlAs as the collection layer. This UTC-PD achieves an f3-dB of 43 GHz and near 30 GHz at multiplication factor of 1 and 2 respecti... 详细信息

ISBN: (纸本)9781957171258

关键词： Photodetectors

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Relation between total pressure loss in supersonic nozzle and isentropic efficiency of nonequilibrium disk-shaped MHD generator

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IEEJ Transactions on Power and Energy 2021年第5期141卷 391-399页

作者： Sakamoto, Yuki Sasaki, Ryo Fujino, Takayasu Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Tennodai Tsukuba305-8577 Japan Graduate School of Science and Technology University of Tsukuba 1-1-1 Tennodai Tsukuba305-8577 Japan Faculty of Engineering Information and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8577 Japan

We conduct an axisymmetric, two-dimensional (r − z) magnetohydrodynamic numerical analysis of a large-scale, nonequilibrium disk-shaped MHD generator with a thermal input of 1 GW to examine the influence of a total pressure loss between the hot duct inlet and the supersonic nozzle outlet of the MHD generator on its isentropic efficiency. Numerical results show that the total pressure loss there substantially affects the isentropic efficiency of the MHD generator. Most of the total pressure loss there, which is mainly caused by a self-excited Joule heating, occurs in a localized area from the vicinity of the hot duct outlet to the radial position of the upstream edge of anode. The numerical results also indicate that the isentropic efficiency is improved by widening an anode width toward the upstream side of the supersonic nozzle. This is because the total pressure loss due to the self-excited Joule heating in the supersonic nozzle decreases by widening it. © 2021 The Institute of Electrical Engineers of Japan.

关键词： Magnetohydrodynamics

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