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Cooperative neural-adaptive fault-tolerant output regulation for heterogeneous nonlinear uncertain multiagent systems with disturbance

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Science China(Information Sciences) 2021年第7期64卷 181-192页

作者： Shanling DONG Guanrong CHEN Meiqin LIU Zheng-Guang WU College of Electrical Engineering Zhejiang University Department of Electrical Engineering City University of Hong Kong National Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang University Institute for Advanced Study Chengdu University

This paper investigates the cooperative output regulation problem for heterogeneous nonlinear uncertain multiagent networked systems subject to actuator failure, bounded matched or mismatched disturbances or disturbances produced by a given linear exosystem. Accurate information about nonlinearity,actuator failure and disturbance may be completely unknown. First, a distributed finite-time observer is designed to estimate the dynamics of the exosystem on a finite-time interval over a communication ***, a neural-adaptive control protocol is proposed. It is shown that(i) closed-loop multiagent systems are asymptotically stable, with output synchronization errors that tend to zero in the absence of mismatched disturbance, and(ii) the states of the closed-loop multiagent systems and the output synchronization errors are bounded in the presence of mismatched disturbance. Finally, a simulation example is given to demonstrate the effectiveness of the proposed control strategy.

关键词： cooperative output regulation actuator failure matched/mismatched disturbance distributed finite-time observer neural-adaptive control

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Predictive model of frailty onset using Bayesian network

Predictive model of frailty onset using Bayesian network

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2022 IEEE International Conference on Big Data, Big Data 2022

作者： Kawai, Yujiro Sakurai, Eiichi Sugawara, Yuki Okada, Yukihiko Tanabe, Kai Tsukao, Akiko Kuno, Shinya National Institute of Advanced Industrial Science and Technology Artificial Intelligence Research Center Tokyo Japan University of Tsukuba Tsukuba Japan Center for Artificial Intelligence Research University of Tsukuba Institute of Systems and Information Engineering Tsukuba Japan University of Tsukuba R&d Center for Smart Wellness City Policies Tsukuba Japan Tsukuba Wellness Research Co. Ltd Chiba Japan

ISBN: (纸本)9781665480451

In this study, we constructed a model for predicting the future frailty status of individuals based on information regarding their current lifestyle habits. In recent years, as the global population ages, the number of people certified for long-term care has increased. In an effort to prevent the need for long-term care, prediction of the onset of frailty, which is positioned as a preliminary stage of the caregiving state, is gaining attention. However, the onset of frailty takes a long time, and the incidence of frailty differs according to one's health literacy. Therefore, a prediction is extremely difficult to achieve. In this study, we constructed a prediction model using a probabilistic latent semantic analysis and a Bayesian network. First, the probabilistic latent semantic analysis was conducted to classify individuals according to their health literacy. Second, we constructed a future frailty prediction model using a Bayesian network for each health literacy segment. As a result, we clarified the following: It is more appropriate to predict a future frailty by predicting the future lifestyle using information on the current lifestyle. In addition, more accurate prediction models can be constructed when individuals are divided based on their health literacy. © 2022 IEEE.

关键词： Bayesian networks

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Method for creating privacy-preserving information using Probabilistic Latent Semantic Analysis

Method for creating privacy-preserving information using Pro...

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IEEE International Conference on Big Data

作者： Yuki Sugawara Eiichi Sakurai Yoichi Motomura Yukihiko Okada Kai Tanabe Akiko Tsukao Shinya Kuno National Institute of Advanced Industrial Science and Technology Koto Japan University of Tsukuba Tsukuba Japan Artificial Intelligence Research Center National Institute of Advanced Industrial Science and Technology Koto Japan Institute of Systems and Information Engineering Center for Artificial Intelligence Research University of Tsukuba Tsukuba Japan Faculty of Health and Sport Sciences R&D Center for Smart Wellness City Policies University of Tsukuba Tsukuba Japan Tsukuba Wellness Research Co. Ltd Kashiwa Japan

In recent years, rapid digitization and technological advances have enabled governments and companies to utilize various types of personal information, including environment, medical, and lifestyle. Privacy protection is an important issue in the utilization of personal information, and anonymization methods such as k-anonymization and 1-diversity have been proposed in the past. However, to utilize data effectively, it is also important not to lose the usefulness of the information. Privacy protection and preserving the usefulness of information are in a trade-off relationship, and balancing these two aspects has been a difficult problem. Recently, microaggregation using clustering algorithms has been attracting attention as an anonymization method that ensures the usefulness of the data while protecting privacy. In this study, we proposed a new microaggregation method based on iterative processing using probabilistic latent semantic analysis and evaluated the proposed method based on the use case. The use case is a classification of social isolation and an analysis of the relationship with physical frailty risk using the classified groups. Compared to microaggregation using quasi-identifiers and microaggregation based on a conventional clustering algorithm, the proposed method was able to find social isolation characteristics obtained in the raw data with higher accuracy. In addition, in a more detailed analysis focusing on a population with certain characteristics, the proposed method was able to replicate the analysis results obtained using the raw data and to make appropriate assessments of the health risks.

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Semi-coherent and coherent nanoprecipitation induced superior strength-ductility combination in additively manufactured CoCrMoW alloy

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Journal of Materials Science & technology 2026年 242卷 1-14页

作者： Canjuan Xiao Weijin Cai Ruidi Li Song Ni Wenting Jiang Zhangwei Wang Khurram Yaqoob Zibin Chen Yi Huang Min Song State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China College of Materials and Advanced Manufacturing Hunan University of Technology Zhuzhou 412007 China School of Chemical and Materials Engineering National University of Sciences and Technology H-12 Islamabad Pakistan Research Institute for Advanced Manufacturing Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong 999077 China Department of Design and Engineering Faculty of Science and Technology Bournemouth University Poole Dorset BH12 5BB UK Materials Research Group Department of Mechanical Engineering University of Southampton Southampton SO17 1BJ UK

The interface coherence between precipitates and the matrix—whether coherent, semi-coherent, or incoherent—significantly impacts both the strength and ductility of metallic materials. An optimal balance between these properties can be achieved through manipulation of the precipitate/matrix interface. In this study, 1 wt.% and 2 wt.% TiN nanoparticles were introduced into a laser powder bed fusion (LPBF) fabricated CoCrMoW alloy as a reinforcing phase. Compared to the unreinforced alloy, the alloy with 1 wt.% TiN exhibited substantial improvements in yield strength, ultimate tensile strength, and fracture elongation, increasing from 876 MPa, 1190 MPa, and 15 % to 1071 MPa, 1421 MPa, and 17 %, respectively. Although the addition of TiN nanoparticles did not significantly affect the average grain size, it inhibited the formation of fine grains at the fusion line and influenced the overall grain size distribution. More importantly, the incorporation of TiN nanoparticles during the LPBF process led to the in-situ formation of semi-coherent precipitates rich in Ti and N, as well as coherent precipitates rich in Ti, N, and O. The semi-coherent precipitates, which exhibit well-defined orientation relationships and periodic misfit dislocations, enhanced strength by blocking stacking faults and ε laths. They also preserved plasticity by promoting self-relaxation through twinning at intersected areas, thus preventing crack nucleation at the interface. Furthermore, the chemical inhomogeneity between the coherent phase and the matrix increased resistance to dislocation cutting of the precipitates, thereby improving the material’s strength without compromising ductility.

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Effects of prosthetic design parameters on running performance of a unilateral transfemoral amputee

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Journal of Biomechanical Science and engineering 2021年第4期16卷 1-11页

作者： Guzelbulut, Cem Suzuki, Katsuyuki Shimono, Satoshi Hobara, Hiroaki Department of Systems Innovation School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan The KAITEKI Institute Inc. 1-1 Marunouchi 1-chome Chiyoda-ku Tokyo100-8251 Japan National Institute of Advanced Industrial Science and Technology 2-3-26 Aomi Koto-ku Tokyo135-0064 Japan

Carbon fiber running-specific prostheses (RSPs) are widely used among lower-limb amputee runners. However, which prosthesis provides the best performance for runners remains unknown. For this purpose, a computational model of the human body with a prosthesis was created and the effect of the prosthetic parameters on performance was investigated. First, motion capture systems were used to collect motion data from amputees. Furthermore, marker and force plate data were obtained to create a digital human model. Kinematic data such as limb lengths and joint angles were calculated using marker data. Afterward, the inertial properties were estimated to conduct inverse dynamic analyses. After building a computational model of amputee sprinting, the joint positions and ground reaction forces (GRFs) were compared with the experimental results. The design parameters of the prosthesis were introduced to understand the effects of the prosthesis on motion and performance. The response surface method was used to express motion adaption regarding the geometry and stiffness of the prosthesis. Hip and knee sagittal joint angles were updated based on the response surface method to simulate joint motion adaptations of the worn prosthesis. Additionally, average horizontal velocity, horizontal velocity change over one gait cycle, vertical and horizontal impulses were considered as performance functions. An evaluation parameter was proposed to generalize the idea of performance. The moment of the prosthetic knee and the closest point of the prosthesis to the ground during the swing phase were defined as design constraints to consider knee buckling and prosthetic leg tripping, respectively. The effect of the design parameters on the performance and constraint functions was also investigated and a method to determine and design a suitable prosthesis for an individual was proposed. It was revealed that proper selection and design of prostheses represent an important way to increase performa

关键词： Inverse problems

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Improvement of Generating Efficiency of Vertical-axis Wind Turbine with Wind Lens

Improvement of Generating Efficiency of Vertical-axis Wind T...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Keita Shimizu Taiga Yoshinari Yamato Muto Hiroyuki Abo Hisao Yaguchi dept. of Advanced Production Systems Engineering Course National Institute of Technology (KOSEN)Gunma College Maebashi Japan dept. of Mechanical Engineering Faculty of Engineering Chiba University Chiba Japan dept. of Aerospace Engineering Graduate School of Engineering Tohoku University Sendai Japan dept. of Mechanical Engineering National Institute of Technology (KOSEN) Gunma College Maebashi Japan

ISBN: (纸本)9781665492331

Offshore large wind turbines attract lots of attention in the decarbonization business. But, the inland region gets left out of this movement. Limited places are suitable for onshore power generation with large propeller wind turbines in Japan. We shed light on vertical-axis small wind turbines which are relatively inexpensive and untroubled. The brimmed diffuser called “Wind Lens” for vertical-axis small wind turbines is studied to improve the generation efficiency of a wind turbine. In this paper, we investigate the influence of the burble inside the wind lens on the amplification of airflow speed using the boundary-layer control technology such as plasma actuator and turbulence tripping. Results show that the wind lens using turbulence tripping is found to be effective to amplify airflow speed.

关键词： Actuators Propellers Low-carbon economy Wind turbines Plasmas Power generation Consumer electronics

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A 280 GHz Quadruple-Push Subharmonic Down-Conversion Mixer with Load Impedance Optimization

A 280 GHz Quadruple-Push Subharmonic Down-Conversion Mixer w...

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Asia-Pacific Conference on Microwave

作者： Akihito Hirai Yuki Tsukui Shinya Yokomizo Ryo Sakamaki Sho Ikeda Information Technology R&D Center Mitsubishi Electric Corporation Kamakura Kanagawa Japan Kamakura Engineering Office Mitsubishi Electric Engineering Co. Ltd. Kamakura Kanagawa Japan Defense & Space Systems Group Mitsubishi Electric Corporation Amagasaki Hyogo Japan National Institute of Advanced Industrial Science and Technology (AIST) Ibaraki Japan

This paper presents the design and fabrication of a 280 GHz quadruple-push subharmonic down-conversion mixer with optimized load impedance using a 45nm CMOS-SOI. A mixer-first architecture is widely used in sub-THz band receivers because of the difficulty of achieving high gain and low NF in low noise amplifiers. Moreover, in sub-THz band mixers, the 4th harmonic mixer is utilized to reduce the chip area and the power consumption by reducing the local oscillator frequency. The proposed 4th harmonic down-conversion mixer uses the AND-gate switching topology for the mixer core and load impedance optimization to prevent degradation of the conversion gain. The proposed mixer achieved the measured conversion gain of −21.9 dB with a small chip area of 0.09 mm 2 by eliminating the bandpass filter.

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Neutron transmission imaging system with a superconducting kinetic inductance detector 36

Neutron transmission imaging system with a superconducting k...

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36th International Symposium on Superconductivity, ISS 2023

作者： Dang Vu, The Shishido, Hiroaki Aizawa, Kazuya Oku, Takayuki Oikawa, Kenichi Harada, Masahide Kojima, Kenji M. Miyajima, Shigeyuki Soyama, Kazuhiko Koyama, Tomio Hidaka, Mutsuo Suzuki, Soh Y. Tanaka, Manobu M. Machida, Masahiko Kawamata, Shuichi Ishida, Takekazu Division of Quantum and Radiation Engineering Osaka Metropolitan University Sakai Osaka599-8570 Japan Materials and Life Science Division J-PARC Center Japan Atomic Energy Agency Ibaraki Tokai319-1195 Japan Department of Physics and Electronics Graduate School of Engineering Osaka Metropolitan University Sakai Osaka599-8531 Japan Centre for Molecular and Materials Science TRIUMF 4004 Wesbrook Mall VancouverBCV6T 2A3 Canada Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Hyogo Kobe651-2492 Japan Advanced Industrial Science and Technology Ibaraki Tsukuba305-8568 Japan Ibaraki Tsukuba305-0801 Japan Ibaraki Tsukuba305-0801 Japan Center for Computational Science & E-Systems Japan Atomic Energy Agency 178-4-4 Wakashiba Chiba Kashiwa277-0871 Japan

We optimized the design and operating conditions of our superconducting neutron detector to improve spatial resolution. We obtained the best spatial resolution of 10 μm when a Gd Siemens star pattern was mounted in close contact with the detector. Although there is a trade-off between a spatial resolution and an easiness of replacing samples, we built our superconducting neutron imaging system for measuring in both the room-temperature samples with a proper collimation ratio L/D for achieving a reasonable spatial resolution and a cryogenic temperature with the best spatial resolution for certain purposes. In this study, we obtained neutron transmission images of various samples when they were cooled down with the superconducting neutron detector. We compared the effect of a different sample-detector distance on a spatial resolution when the samples were placed either at cryogenic temperature or at room temperature. We also confirmed that our CB-KID sensor was able to observe the neutron transmission coefficient over wider energies of pulsed neutrons. We found the appearance of clear Bragg dips by the measurements of natural FeS2 single crystals and succeeded in mapping the distribution of differently-oriented crystals by choosing several Bragg dips of the FeS2 crystals to compose the transmission images. © Published under licence by IOP Publishing Ltd.

关键词： Single crystals

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A Study on Relationship between Consumer Review Behavior and Purchasing in EC site 9

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

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9th International Congress on advanced Applied Informatics, IIAI-AAI 2020

作者： Yoshida, Miyuji Tabata, Tomoaki Hosoda, Takaaki Tokai University Course of Information and Telecommunication Engineering Tokyo Japan Tokai University Department of Information and Communication Technology Tokyo Japan Information Systems Architecture Advanced Institute of Industrial Technology Tokyo140-011 Japan

ISBN: (纸本)9781728173979

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. © 2020 IEEE.

关键词： Consumer behavior

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Simple measures to capture the robustness and the plasticity of soil microbial communities

arXiv

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arXiv 2024年

作者： Shimada, Takashi Mise, Kazumori Morino, Kai Otsuka, Shigeto Department of Systems Innovation School of Engineering The University of Tokyo Mathematics and Informatics Center The University of Tokyo Japan Graduate School of Agricultural and Life Sciences The University of Tokyo Graduate School of Science The University of Tokyo Bioproduction Research Institute National Institute of Advanced Industrial Science and Technology Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu University Japan Graduate School of Agricultural and Life Sciences The University of Tokyo Collaborative Research Institute for Innovative Microbiology The University of Tokyo Japan

Soil microbial communities are known to be robust against perturbations such as nutrition inputs, which appears as an obstacle for the soil improvement. On the other hand, its adaptable aspect has been also reported. Here we propose simple measures for these seemingly contradicting features of soil microbial communities, robustness and plasticity, based on the distribution of the populations. The first measure is the similarity in the population balance, i.e. the shape of the distribution function, which is found to show resilience against the nutrition inputs. The other is the similarity in the composition of the species measured by the rank order of the population, which shows an adaptable response during the population balance is recovering. These results clearly show that the soil microbial system is robust (or, homeostatic) in its population balance, while the composition of the species is rather plastic and adaptable. © 2024, CC BY.

关键词： Anthropogenic

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