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63rd IEEE Conference on Decision and control, CDC 2024

作者： You, Jiawei Dai, Xinliang Jiang, Yuning Yin, Haoyu Shi, Yuanming Jones, Colin N. ShanghaiTech University School of Information Science and Technology China Epfl Switzerland Karlsruhe Institute of Technology Institute for Automation and Applied Informatics Germany Epfl Automatic Control Laboratory Switzerland Washington University in St. Louis Department of Electrical and Systems Engineering United States

ISBN: (纸本)9798350316339

This paper explores the impact of the burgeoning electric vehicle (EV) presence on distribution grid operations, highlighting the challenges they present to conventional pricing strategies due to their dual role as power consumers and suppliers, coupled with their energy storage capabilities. We propose an advanced real-time pricing model for the electricity market, employing a novel distributed bilevel optimization framework. This framework distinguishes between the distribution system operator (DSO) at the upper level and the EVs at the lower level, each aiming to optimize profit margins. The optimization includes power flow constraints at the upper level to ensure efficient operation within safe system limits, while model predictive control (MPC) is used to optimize lower-level EV responses. Additionally, we provide a rigorous convergence analysis of the proposed bilevel optimization method. Detailed convergence studies and simulation results demonstrate the effectiveness and superiority of the proposed algorithm. © 2024 IEEE.

关键词： Predictive control systems

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Dynamic mode decomposition for Koopman spectral analysis of elementary cellular automata

arXiv

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arXiv 2023年

作者： Taga, Keisuke Kato, Yuzuru Yamazaki, Yoshihiro Kawahara, Yoshinobu Nakao, Hiroya Department of Physics School of Advanced Science and Engineering Waseda University Tokyo169-8555 Japan Department of Complex and Intelligent Systems School of Systems Information Science Future University Hakodate Hokkaido041-8655 Japan Graduate School of Information Science and Technology Osaka University Osaka565-0871 Japan Center for Advanced Intelligence Project RIKEN Tokyo103-0027 Japan Department of Systems and Control Engineering School of Engineering Tokyo Institute of Technology Tokyo152-8552 Japan

We apply Dynamic Mode Decomposition (DMD) to Elementary Cellular Automata (ECA). Three types of DMD methods are considered and the reproducibility of the system dynamics and Koopman eigenvalues from observed time series are investigated. While standard DMD fails to reproduce the system dynamics and Koopman eigenvalues associated with a given periodic orbit in some cases, Hankel DMD with delay-embedded time series improves reproducibility. However, Hankel DMD can still fail to reproduce all the Koopman eigenvalues in specific cases. We propose an Extended DMD method for ECA that uses nonlinearly transformed time series with discretized Walsh functions and show that it can completely reproduce the dynamics and Koopman eigenvalues. Linear-algebraic backgrounds for the reproducibility of the system dynamics and Koopman eigenvalues are also discussed. Copyright © 2023, The Authors. All rights reserved.

关键词： Dynamic mode decomposition

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Outdoor THz Radio Units with Weather and Temperature Sensors for Long-Term Measurement

Outdoor THz Radio Units with Weather and Temperature Sensors...

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IEEE Conference on Antenna Measurements & Applications (CAMA)

作者： Arata Ogaki Kota Nagasawa Masataka Sugiyama Kunihisa Jitsuno Shintaro Hisatake Tetsuya Kawanishi Graduate School of Fundamental Science and Engineering Waseda Univeristy Tokyo Japan Department of Electronic and Physical Systems Graduate School of Fundamental Science and Engineering Waseda Univeristy Tokyo Japan Ltd. SED Kanagawa Japan Faculty of Engineering Gifu University Gifu Japan

ISBN: (数字)9798350386929

ISBN: (纸本)9798350350746

This paper describes 300GHz TDD (Time division duplex) radio units based on IEEE.802.15.3d. The radio units offer two 2.16-GHz channels whose frequencies are 286.2 GHz and 288.36 GHz. Outdoor propagation measurement is performed on a rooftop of a building in Waseda University campus. Weather and temperature sensors are installed for long-term measurement.

关键词： Antenna measurements Temperature measurement Temperature sensors Wireless communication Wireless sensor networks Transmitting antennas Buildings Meteorology

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Cr-Cr distance and magnetism in the phase diagram of triangular lattice antiferromagnets: A systematic comparative study

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Physical Review Materials 2024年第8期8卷 084403-084403页

作者： E. Nocerino J. Sugiyama O. K. Forslund I. Umegaki S. Kobayashi K. Yoshimura Y. Sassa M. Månsson Department of Applied Physics Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan Advanced Science Research Center Physik-Institut Department of Physics and Astronomy Muon Science Laboratory (JASRI) 1-1-1 Kouto Sayo 679-5198 Japan Department of Chemistry Graduate School of Science Department of Energy and Hydrocarbon Chemistry Graduate School of Engineering

In this study, we investigate the influence of Cr-Cr distances on the magnetic properties of triangular lattice antiferromagnets through the lens of the recently synthesized Cr compounds LiCrSe2, LiCrTe2, and NaCrTe2. Our comprehensive analysis integrates existing magnetic structure data and new insights from muon spin rotation measurements, revealing a striking mutual influence between strongly correlated electrons and structural degrees of freedom in systems possessing very different magnetic properties despite having the same crystal symmetry. In particular, we delineate how Cr-Cr distances specifically dictate the magnetic behaviors of the triangular lattice antiferromagnets LiCrSe2, LiCrTe2, and NaCrTe2. By crafting phase diagrams based on these distances, we establish a clear correlation between the structural parameters and the magnetic ground states of these materials together with a wide variety of trivalent Cr triangular lattice layered magnets. Our analysis uncovers a transition range for in-plane and out-of-plane Cr-Cr distances that demarcates distinct magnetic behaviors, highlighting the nuanced role of lattice geometry in the spin-lattice interaction and electron correlation dynamics.

关键词： Antiferromagnetism Exchange interaction Frustrated magnetism Magnetic phase transitions Magnetism Magnetoelastic effect

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Adaptive Memory Event-Triggered Observer-Based control for Nonlinear Multi-Agent systems Under DoS Attacks

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IEEE/CAA Journal of Automatica Sinica 2021年第10期8卷 1644-1656页

作者： Xianggui Guo Dongyu Zhang Jianliang Wang Choon Ki Ahn School of Beijing Engineering Research Center of Industrial Spectrum Imaging School of Automation and Electrical EngineeringUniversity of Science and Technology BeijingBeijing 100083 Shunde Graduate School of University of Science and Technology Beijing Foshan 528000China Autonomous Intelligent Systems Department Hangzhou Innovation Institute of Beihang UniversityHangzhou 310051China School of Electrical Engineering Korea UniversitySeoul 1360701Korea

This paper investigates the event-triggered security consensus problem for nonlinear multi-agent systems(MASs)under denial-of-service(Do S)attacks over an undirected graph.A novel adaptive memory observer-based anti-disturbance control scheme is presented to improve the observer accuracy by adding a buffer for the system output ***,this control scheme can also provide more reasonable control signals when Do S attacks *** save network resources,an adaptive memory event-triggered mechanism(AMETM)is also proposed and Zeno behavior is *** is worth mentioning that the AMETM's updates do not require global ***,the observer and controller gains are obtained by using the linear matrix inequality(LMI)***,simulation examples show the effectiveness of the proposed control scheme.

关键词： Adaptive memory event-triggered mechanism(AMETM) compensation mechanism denial-of-service(DoS)attacks nonlinear multi-agent systems(MASs) observer-based anti-disturbance control

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Location-Based Broad-Range Null-Steering in V2X Multiuser MIMO Transmission

Location-Based Broad-Range Null-Steering in V2X Multiuser MI...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Yuki Sasaki Sojin Ozawa Kabuto Arai Jin Nakazato Manabu Tsukada Kazuki Maruta Department of Electrical Engineering Graduate School of Engineering Tokyo University of Science Tokyo Japan Advanced Wireless and Communication Research Center The University of Electro-Communications Tokyo Japan Graduate School of Information Science and Technology The University of Tokyo Tokyo Japan

This paper proposes an intensive null-steering around the target in angular domain to effectively suppress inter-user interference (IUI) leakage caused by channel varying environment such as vehicular multiuser spatial multiplexing. Multiuser MIMO can enhance spectral efficiency by multiplexing a number of user terminals in spatial domain. Suppose applying multiuser MIMO downlink in vehicle-to-everything (V2X) scenario, vehicles move at high speed which causes IUI. Null-space expansion has been conceived that can improve IUI suppression capability by steering nulls to the past and the present channel states on interfered users. Collective perception in intelligent transport systems (ITS) provides location information of vehicles every 100 ms. Exploiting this feature, this paper proposes angular-domain null-space expansion; broad-range null-steering (BRNS). Computer simulation verifies its effectiveness.

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Magnetoelastic coupling driven magnon gap in a honeycomb antiferromagnet

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Physical Review B 2024年第10期110卷 104419页

作者： Jeongheon Choe Andrey Baydin Gaihua Ye Bowen Ma Cynthia Nnokwe Martin Rodriguez-Vega David Lujan Swati Chaudhary Fuyang Tay Jiaming He Hiroyuki Nojiri Jianshi Zhou Gregory A. Fiete Junichiro Kono Rui He Xiaoqin Li Department of Physics Center of Complex Quantum Systems Center for Dynamics and Control of Materials Department of Electrical and Computer Engineering Smalley–Curl Institute Department of Physics Applied Physics Graduate Program Smalley–Curl Institute Department of Mechanical Engineering Institute for Materials Research Department of Physics and Astronomy Department of Materials Science and NanoEngineering

Cobalt titanate, CoTiO3, is a honeycomb antiferromagnet recently confirmed experimentally to host Dirac magnons, topological spin-orbit excitons, and chiral phonons. Here, we investigate a magnon gap at the zone center which calls for a refined spin Hamiltonian. We propose a microscopic model for the magnon gap and attribute it to a lattice-distortion (phonon)-induced higher-order spin interaction. Strong magnetoelastic coupling in CoTiO3 is also evident in Raman spectra, in which the magnetic order exerts a stronger influence on phonons corresponding to in-plane ionic motions than those with out-of-plane motions. We further examine the evolution of the zone-center magnons in a high magnetic field up to 18.5 T via THz absorption spectroscopy measurements. Based on this field dependence, we propose a spin Hamiltonian that not only agrees with magnon dispersion measured by inelastic neutron scattering but also includes fewer exchange constants and a realistic anisotropy term. Our work highlights the broad implications of magnetoelastic coupling in the study of topologically protected bosonic excitations.

关键词： Magnetism Magnons Topological materials Raman spectroscopy Terahertz spectroscopy

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An ultra thin,bright,and sensitive interactive tactile display based on organic mechanoluminescence for dual-mode handwriting identification

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InfoMat 2024年第6期6卷 76-87页

作者： Tingting Hou Wenlang Li Haoyu Wang Yuantian Zheng Chaojie Chen Haoran Zhang Kai Chen Huilin Xie Xin Li Shaoshuai He Siwei Zhang Dengfeng Peng Cheng Yang Jacky W.Y.Lam Ben Zhong Tang Yunlong Zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kongthe People's Republic of China 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 TechnologyHong Kongthe People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenthe People's Republic of China Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)Guangzhouthe People's Republic of China The Hong Kong University of Science and Technology Interdisciplinary Program Office Hong Kong SARthe People's Republic of China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenthe People's Republic of China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenthe People's Republic of China HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Shenzhenthe People's Republic of China Guangzhou HKUST Fok Ying Tung Research Institute Guangzhouthe People's Republic of China

Visible light-based human–machine interactive media is capable of transmitting electrical readouts to machines and providing intuitive feedback to users ***,many inorganic mechanoluminescent(ML)materials-based interactive media,typically ZnS-loaded phosphors(ZLPs),have been successfully ***,organic ML materials-based solutions were rarely exploited despite their huge merits of strong structural modification,abundant luminescence property,low cost,easy preparation,and so ***,we propose a novel interactive tactile display(ITD)based on organic ML materials(Cz-A6-dye)and triboelectric nanogenerator,with ultra-brightness(130%enhancement)and ultra-low threshold pressure(57%reduction)as compared to *** proposed ITD achieves the conversion of weak mechanical stimuli into visible light and electrical signals simultaneously,without extra power ***,the relationship between the luminous performance of organic ML materials and mechanical force is quantified,benefiting from the uniform ML layer *** by convolutional neural networks,the high-accuracy recognition(97.1%)for handwriting and identity of users is realized at the same ***,the ITD has great potential for intelligent wearable electronics and classified military applications.

关键词： interactive media organic mechanoluminescence triboelectric nanogenerators

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Genome-scale metabolic models applied for human health and biopharmaceutical engineering

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Quantitative Biology 2023年第4期11卷 363-375页

作者： Feiran Li Yu Chen Johan Gustafsson Hao Wang YiWang Chong Zhang Xinhui Xing nstitute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenChina Key Laboratory of Quantitative Synthetic Biology Shenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina Department of Biology and Biological Engineering Chalmers University of TechnologyGothenburgSweden Key Laboratory for Industrial Biocatalysis Ministry of EducationInstitute of Biochemical EngineeringDepartment of Chemical EngineeringTsinghua University BeijingChina Center for Synthetic and Systems Biology Tsinghua UniversityBejingChina Institute of Biomedical Health Technology and Engineering Shenzhen Bay LaboratoryShenzhenChina

Over the last 15 years,genome-scale metabolic models(GEMs)have been reconstructed for human and model animals,such as mouse and rat,to systematically understand metabolism,simulate multicellular or multi-tissue interplay,understand human diseases,and guide cell factory design for biopharmaceutical protein ***,we describe how metabolic networks can be represented using stoichiometric matrices and well-defined constraints for flux ***,we review the history of GEM development for quantitative understanding of Homo sapiens and other relevant animals,together with their *** describe how model develops from *** to other animals and from generic purpose to precise context-specific *** progress of GEMs for animals greatly expand our systematic understanding of metabolism in human and related *** discuss the difficulties and present perspectives on the GEM development and the quest to integrate more biological processes and omics data for future research and *** truly hope that this review can inspire new models developed for other mammalian organisms and generate new algorithms for integrating big data to conduct more in-depth analysis to further make progress on human health and biopharmaceutical engineering.

关键词： constraint-based modeling disease genome-scale metabolicmodel metabolism

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Development of a Passive Mechanism for Transfemoral Prosthetic Knee to Assist Sitting-Down on/Stand-Up from a Chair

Development of a Passive Mechanism for Transfemoral Prosthet...

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SICE Annual Conference

作者： Shuji Sakoda Mai Murabayashi Takuya Mitani Koh Inoue Graduate School of Science for Creative Emergence Kagawa University Kagawa Japan Graduate School of Engineering Kagawa University Kagawa Japan Are of Mechanical Systems Engineering Kagawa University Takamatsu Japan Department of Life Science and Biotechnology Health and Medical Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Takamatsu Japan

ISBN: (数字)9784907764838

ISBN: (纸本)9798331544461

Sitting down and standing up from a chair are essential daily activities. However, existing prosthetic knees often lack sufficient functionality to perform these motions, particularly when standing up. Consequently, unilateral transfemoral prosthetic users must rely more on their sound limb for these motions, which can potentially lead to injury or joint disease due to the increased load on the joints of the intact side. The present study aimed to develop a prosthetic knee mechanism that assists in sitting down and standing up from a chair. We proposed a new passive mechanism integrated into our previous prosthetic knee design. This mechanism stores mechanical energy in a spring during knee flexion when sitting down, providing flexion resistance. The stored energy is then released by the user's manipulation, assisting in knee extension. In the evaluation experiment, a subject equipped with a simulated thigh socket and the proposed prosthetic knee performed the motions of sitting down and standing up from a chair. The results demonstrated a higher symmetry index of the ground reaction force during these motions with the proposed mechanism compared to the literature, suggesting that the mechanism functioned appropriately. The proposed mechanism can be applied to other prosthetic knees, potentially allowing transfemoral amputees to gain the functionality for standing up without needing to replace their current prosthetic knee.

关键词： Resistance Limbs Sockets Force Thigh Iron Mechanical energy Springs Injuries Prosthetics

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