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23rd International Conference on control, Automation and systems, ICCAS 2023

作者： Kobayashi, R. Yoshimi, T. Graduate School of Engineering and Science Shibaura Institute of Technology Functional Control Systems Course Tokyo135-8548 Japan College of Engineering Shibaura Institute of Technology Department of Electrical Engineering Tokyo135-8548 Japan

ISBN: (纸本)9788993215274

In this work, we propose a design guideline of teleoperation support system for working robots in radiation narrow environments. The proposed guideline is discussed to configure the robot system with as few sensors as possible because of decreasing the sensor failure risk by high radiation. This paper describes discussion results of the guideline candidate, focusing on relationship between the required information for robot teleoperation and number of sensors that consists of the support system. Additionally, we present some support systems that were developed for an inspection or an investigation of nuclear power plants as development cases. As a result of the guideline calculation for each development cases, we confirmed that the proposed guideline increases as the required radiation tolerance is high, and the support system is classified by the guideline. In case that the torelance is more than 200 Gy, available sensors are limited, and a sensor-saving configuration is adopted to decrease the robot failur risk by using in combination with a sensor for the robot operation. © 2023 ICROS.

关键词： Remote control

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Development of Asymmetrical Four-Phase Bearingless Motor with Unequal-Tooth-Pitch Stator 27

Development of Asymmetrical Four-Phase Bearingless Motor wit...

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27th International Conference on Electrical Machines and systems, ICEMS 2024

作者： Kamiya, Yoshinori Asama, Junichi Shizuoka University Graduate School of Science and Technology Department of Environment and Energy Systems Hamamatsu Japan Shizuoka University Department of Mechanical Engineering Hamamatsu Japan

ISBN: (纸本)9784886864406

A bearingless motor integrates the function of a magnetic bearing, allowing for non-contact rotation;however, displacement sensors are required for active magnetic suspension control, but this increases the size of the motor. To reduce the size of the motor, this study proposes an unequal-tooth-pitch stator configuration for a 10-pole/12-slot bearingless motor, where displacement sensors and Hall effect sensors can be placed between the stator teeth. From the results of a finite element analysis (FEA), a stator shape that does not fluctuate the unbalanced magnetic pull caused by the changes in rotation angle was designed. Optimal asymmetrical four-phase combined winding arrangements were selected based on the magnetomotive force distribution. A current-suspension force model considering up to the fifth harmonic of the electric angle was obtained by the FEA and used for suspension force control. The test machine was successfully driven at 1500 rpm by magnetic levitation. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Stators

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Examine the filter bubble with a focus on emotion and content 24

Examine the filter bubble with a focus on emotion and conten...

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8th International Conference on Natural Language Processing and Information Retrieval, NLPIR 2024

作者： Kita, Shusaku Mine, Tsunenori Arakawa, Yutaka Department of Information Science and Technology Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka Japan Department of Advanced Information Technology Faculty of Information Science and Electrical Engineering Kyushu University Fukuoka Japan

ISBN: (纸本)9798400717383

Recommendation systems (RSs) have become popular in various Internet services, enabling the delivery of content tailored to user preferences. While RSs are designed to update recommended content to align more closely with user preferences based on browsing history and registration information, RSs may still present biased information due to inherent characteristics. This phenomenon is known as the "filter bubble,"a crucial aspect of the discourse on "informational health."Previous studies have examined the filter bubble phenomenon, focusing on the potential for bias in recommended content. However, there is no consensus on the definition of "bias,"and no agreement on the criteria for identifying a filter bubble state. In addition, the previous methods rely primarily on topic diversity as a metric, overlooking other important indicators. This study presents a more comprehensive approach to defining the state of the filter bubble. Our methodology employs two key indicators: content and emotion. We also evaluate the effectiveness of the proposed approach. © 2024 Copyright held by the owner/author(s).

关键词： Sentiment analysis

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Online Auto-Tuning Method in Field-Orientation-controlled Induction Motor Driving Inertial Load

IEEE Open Journal of Industry Applications

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IEEE Open Journal of Industry Applications 2022年 3卷 125-140页

作者： Nagataki, Masaki Kondo, Keiichiro Yamazaki, Osamu Yuki, Kazuaki Nakazawa, Yosuke Waseda University Department of Electrical Engineering and Bio-science School of Advanced Science and Engineering Shinjuku1698555 Japan Toshiba Infrastructure Systems & Solutions Corporation Fuchu1838511 Japan

Feed-forward current control, which employs a single-pulse mode of inverters over a wide speed range, is applied in inertial load drive applications such as electric vehicles and electric railway vehicles. It is necessary to identify both primary and secondary motor parameters to realize sophisticated torque control in the feed-forward current control region, wherein the current controller cannot compensate for motor parameter errors. An online auto-tuning method that is based on the fundamental components of motor voltages during acceleration with an inertial load is proposed in this study. The convergence of the proposed auto-tuning is discussed, and a calculation method for correction gains is proposed to compensate for the motor parameters. The proposed method is verified via numerical simulation and experiments with a 750 W induction motor and an inertial load. © 2020 IEEE.

关键词： Transient analysis

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Matthew effect:General design strategy of ultra-fluorogenic nanoprobes with amplified dark–bright states in aggregates

Aggregate

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Aggregate 2024年第2期5卷 482-492页

作者： Shinsuke Segawa Xinwen Ou Tianruo Shen Tomohiro Ryu Yuki Ishii Herman H.Y.Sung Ian D.Williams Ryan T.K.Kwok Ken Onda Kiyoshi Miyata Xuewen He Xiaogang Liu Ben Zhong Tang Translational and Advanced Bioimaging Laboratory Department of Chemical and Biological EngineeringSchool of EngineeringThe Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced StudyThe Hong Kong University of Science and TechnologyKowloonHong KongChina Science Mathematics and Technology ClusterSingapore University of Technology and DesignSingaporeSingapore Department of Chemistry Graduate School of ScienceKyushu UniversityNishi-kuFukuokaJapan The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsuChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenGuangdongChina

Fluorescence imaging,a key technique in biological research,frequently utilizes fluorogenic probes for precise imaging in living *** is an effective emission quencher in fluorogenic probe designs,which can be selectively damaged upon bioorthogonal click reactions,leading to considerable emission *** significant efforts to increase the emission enhancement ratio(I_(AC)/I_(BC))of tetrazine-functionalized fluorogenic probes,the influence of molecular aggregation on the emission properties has been largely overlooked in these probe *** this study,we reveal that an ultrahigh I_(AC)/I_(BC)can be realized in the aggregate system when tetrazine is paired with aggregation-induced emission(AIE)*** amplifies its quenching efficiency upon aggregation and drastically reduce background *** click reactions damage tetrazine and trigger significant AIE,leading to considerably enhanced I_(AC)/I_(BC).We further showcase the capability of these ultra-fluorogenic systems in selective imaging of multiple organelles in living *** term this unique fluorogenicity of AIE luminogen-quencher complexes with amplified dark-bright states as“Matthew effect”in aggregate emission,potentially providing a universal approach to attain ultrahigh I_(AC)/I_(BC)in diverse fluorogenic systems.

关键词： aggregation-induced emission bioorthogonal chemistry click chemistry fluorescence imaging tetrazine

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Development of Trans-nail PPG controller Using Fingertip Blood Volume Changes to Enable Highly Accurate Motion Prediction

Development of Trans-nail PPG Controller Using Fingertip Blo...

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2023 IEEE Biomedical Circuits and systems Conference, BioCAS 2023

作者： Nakamura, Kohei Du, Bang Sugishita, Keishun Hasegawa, Ryo Kino, Hisashi Fukushima, Takafumi Kiyoyama, Koji Tanaka, Tetsu Nagasaki Institute of Applied Science Graduate School of Engineering Nagasaki851-0193 Japan Tohoku University Graduate School of Engineering Department of Mechanical Systems Engineering Sendai980-8579 Japan Tohoku University Graduate School of Biomedical Engineering Sendai980-8579 Japan

ISBN: (纸本)9798350300260

The widespread adoption of Virtual Reality (VR)/Augmented Reality (AR) has increased the demand for versatile controllers for VR/AR. Most conventional controllers for VR/AR have issues with a lack of immersive sensation, comfort, and stability. This study proposes a trans-nail PPG (photoplethysmography) controller using fingertip blood volume changes to enable accurate motion prediction. This controller utilizes the fact that the mainly DC component of the PPG signal varies with the state and movement of the hand and fingers. Based on reservoir computing, this controller also learns the PPG signals under various conditions and predicts the state and movement of the hand and fingers. Since this controller is attached to the fingernail, it does not compromise immersion, comfort, or stability. Three PPG sensor circuits in the trans-nail PPG sensor were designed, prototyped, and assembled with an LED on a nail-sized PCB. The output signals of the PPG sensor for various motions such as thumb raising and lowering, wrist raising and lowering, and wrist twisting were used for the learning and predictions of reservoir computing. As a result, the motion predictions with accuracies of over 90% were achieved successfully. © 2023 IEEE.

关键词： AR augmented reality controller photoplethysmography PPG reservoir computing trans-nail virtual Reality VR

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Energy-Free Sensing and Context Recognition Using Photovoltaic Cells

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IEEE Sensors Journal 2025年第9期25卷 15598-15611页

作者： Shintani, Kaede Rizk, Hamada Yamaguchi, Hirozumi Osaka University Graduate School of Information Science and Technology Department of Information Networking Suita565-0871 Japan Tanta University Tanta31733 Egypt RIKEN Center for Computational Science Kobe650-0047 Japan RIKEN Center for Computational Science Department of Computer and Control Engineering Kobe650-0047 Japan

The field of energy-free sensing and context recognition has recently gained significant attention as it allows operating systems without external power sources. Photovoltaic cells can convert light energy into electrical energy to power sensing devices, but their power may not be sufficient to ensure energy-free sensing due to the varying power needs of sensors and high computational demands. In this article, we propose the use of photovoltaic cells as a standalone sensor for the recognition of different contexts, including user identification, step counting, and location tracking. The system utilizes the photocurrent readings generated by the photovoltaic cells to capture the unique mobility patterns of different users. By analyzing these patterns, the system can accurately identify the user, count the number of steps taken, and track the user’s location. We propose a computationally efficient dynamic time warping (DTW) to match the variable length sequences of photocurrent readings to a database of known patterns and identify the closest subject and location matches. The system was rigorously evaluated in a realistic environment, and the results indicate that it can accurately estimate step count, identify subjects, and localize them with an accuracy of 88%, 90%, and 43 cm, respectively. This is achieved while the proposed system is nonintrusive and can operate without external power sources, making it a promising technology for energy-free sensing and context recognition. © 2001-2012 IEEE.

关键词： Photovoltaics

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Chemical Interpretation on the Multi-Stage Oxidation of Diethyl Ether

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Journal of Thermal science 2023年第2期32卷 513-520页

作者： SAKAI Yasuyuki NAKAMURA Hisashi SUGITA Toru TEZUKA Takuya UYGUN Yasar Department of Mechanical Systems Engineering Ibaraki UniversityIbaraki 316-8511Japan Institute of Fluid Science Tohoku UniversityMiyagi 980-8577Japan Graduate School of Engineering Tohoku UniversityMiyagi 980-8579Japan Mathematics and Logistics Jacobs University BremenBremen 28759Germany

Multi-stage ignition and/or double NTC(negative temperature coefficient)behavior resulted from the low-temperature oxidation of ether compounds are still not clearly *** have investigated the oxidation mechanism of a stoichiometric DEE(diethyl ether)/air mixture by using a micro flow reactor with a controlled temperature profile to see the detail of low-temperature weak flame *** simulation was also performed to understand the chemical kinetics mechanism of observed weak flame *** measurement showed separated weak flame in the temperature range of 600 K-800 *** simulation also qualitatively reproduced this separated weak flame,and showed four peak of heat *** the reaction flow analysis,it was found that(1)O-O bond scission reaction of keto-hydroperoxide produced by DEE,(2)O-O bond scission reaction of CH3O2H,CH3CO3H,and C2H5O2H,(3)O-O bond scission reaction of H2O2,and(4)H+O2=O+OH are key chain branching reactions to explain the multi-stage oxidation.

关键词： diethyl ether micro flow reactor weak flame multi-stage oxidation reaction path

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EKF Estimation of Sensor Installation Parameters for Sensor Fusion in Drones and its Observability Analysis

EKF Estimation of Sensor Installation Parameters for Sensor ...

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18th IEEE International Conference on advanced Motion control, AMC 2024

作者： Nozaki, Taiki Sekiguchi, Kazuma Nonaka, Kenichiro Graduate School of Integrate Science and Engineering Tokyo City University Tokyo Japan Tokyo City University Department of Mechanical Systems Engineering Tokyo Japan

ISBN: (纸本)9798350342819

Since the accuracy of estimation is affected by the characteristics of the sensors and the operating environment, sensor fusion based on self localization using multiple sensor information has been proposed. In sensor fusion, when a new sensor is used, the position and orientation information of that sensor needs to be specified. Normally, these parameters are known by prior measurement or other means, but to improve accuracy through sensor fusion, it is important to know these values as accurately as possible. However, sensor fusion with these parameters unknown has not been discussed so far. This paper aims to improve the accuracy of state estimation by performing sensor fusion while estimating unknown installation parameters. We also examines whether it is possible to evaluate the accuracy of parameter estimation in such cases. The position and orientation of the Time-of-Flight (ToF) sensors are chosen as parameters. The parameters are added as a estimation target as well as the drone's states, and the Extended Kalman filter (EKF) is used to estimate the expanded system which they are added. It is then verified whether the accuracy of the estimation can be assessed by analysing local observability using the Lie derivative and the degree of observability of the system using the condition number of the observability matrix. Simulations show that simultaneous estimation of the state and parameters by EKF is possible, and that the accuracy of the estimation is improved for arbitrary states. And as a result, the degree of observability using the number of conditions allows a quantitative assessment of the accuracy of state and parameter estimation. © 2024 IEEE.

关键词： Extended Kalman filters

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Sliding Mode control for Recurrent Neural Networks With Time-Varying Delays and Impulsive Effects

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1319-1321页

作者： Lanfeng Hua Kaibo Shi Zheng-Guang Wu Soohee Han Shouming Zhong the School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China the School of Electronic Information and Electrical Engineering Chengdu UniversityChengdu 610106China the Institute of Cyber-Systems and Control Zhejiang UniversityHangzhou 310027China the Department of Electrical Engineering and Convergence IT Engineering Pohang University of Science and TechnologyPohang 37673South Korea the School of Mathematics Sciences University of Electronic Science and Technology of ChinaChengdu 611731China

Dear Editor,This letter studies the problem of sliding mode control(SMC)design for recurrent neural networks(RNNs)with impulsive disturbances and time-varying transmission *** this end,an appropriate integral sliding ... 详细信息

关键词： impulsive letter delays

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