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International Conference on Electrical, control and Instrumentation engineering (ICECIE)

作者： Kazuhiro Hirasawa Daiki Asada Shunya Nagai Hidetoshi Oya Graduate School of Integrative Science and Engineering Tokyo City University Tokyo Japan Department of Electronics and Control Engineering National Institute of Technology (KOSEN) Niihama College Ehime Japan The Department of Computer Science Tokyo City University Tokyo Japan

ISBN: (数字)9798350380040

ISBN: (纸本)9798350380057

This paper proposes a new variable gain robust state observer for a class of uncertain nonlinear systems. The variable gain robust state observer proposed in this paper consists of fixed observer gain matrices and nonlinear modification functions which are determined by appropriate updating rules. It is shown that sufficient conditions for the existence of the proposed variable gain robust state observer can be reduced to solvability of Linear Matrix Inequalities (LMIs). Finally, we give a simple numerical example.

关键词： Linear systems Sufficient conditions Instruments Delay effects Riccati equations Interconnected systems Observers Linear matrix inequalities Nonlinear systems Gain

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Pressure Evolution of Magnetic Structure and Quasiparticle Excitations in Anisotropic Frustrated Zigzag Chains

arXiv

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arXiv 2024年

作者： Hori, Fumiya Matsudaira, Hiroyasu Kitagawa, Shunsaku Ishida, Kenji Suzuki, Hiroto Onimaru, Takahiro Department of Physics Kyoto University Kyoto606-8502 Japan Department of Quantum Matter Graduate School of Advanced Science and Engineering Hiroshima University Higashihiroshima739-8530 Japan

Frustrated magnetic systems with anisotropic exchange interactions have been recognized as key platforms for discovering exotic quantum states and quasiparticles. In this study, we report the pressure evolution of magnetic structures and quasiparticle excitations in the frustrated semiconductor YbCuS2, characterized by Yb3+ zigzag chains with competing exchange interactions. At ambient pressure, YbCuS2 exhibits a magnetic transition at TN ∼ 0.95 K, forming an incommensurate helical magnetic order. Under hydrostatic pressure of 1.6 GPa, TN increases to 1.17 K, and the magnetic structure changes to a commensurate one, which can be regarded as an odd-parity magnetic multipole order. Remarkably, pressure suppresses the gapless quasiparticle excitations. These findings suggest that pressure alters the exchange interactions between the Yb ions, affecting both the magnetic ground state and the quasiparticle excitations. Our results highlight the pivotal role of anisotropic interactions in one-dimensionality to stabilize the complex quantum phases, offering insights into the interplay among frustration, dimensionality, multipoles and emergent quasiparticles. © 2024, CC BY.

关键词： Ytterbium compounds

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QuITO v.2: Trajectory Optimization with Uniform Error Guarantees under Path Constraints

arXiv

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arXiv 2024年

作者： Ganguly, Siddhartha D’Silva, Rihan Aaron Chatterjee, Debasish Systems and Control Engineering Indian Institute of Technology Mumbai400076 India Applied Mathematics and Physics Graduate School of Informatics Kyoto University Japan Department of Aerospace Engineering University of Illinois at Urbana-Champaign United States

This article introduces a new transcription, change point localization, and mesh refinement scheme for direct optimization-based solutions and for uniform approximation of optimal control trajectories associated with a class of nonlinear constrained optimal control problems (OCPs). The base transcription algorithm for which we establish the refinement algorithm is a direct multiple shooting technique — QuITO v.2 (Quasi-Interpolation based Trajectory Optimization). The mesh refinement technique consists of two steps — localization of certain irregular regions in an optimal control trajectory via wavelets, followed by a targeted ℎ-refinement approach around such regions of irregularity. Theoretical approximation guarantees on uniform grids are presented for optimal controls with certain regularity properties along with guarantees of localization of change points by wavelet transform. Numerical illustrations are provided for control profiles involving discontinuities to show the effectiveness of the localization and refinement strategy. We also announce, and make freely available, a new software package based on QuITO v.2 along with all its functionalities for completeness. The package is available at: https://***/chatterjee-d/***. Copyright © 2024, The Authors. All rights reserved.

关键词： Mesh generation

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Development of a VS ultrasound diagnostic system with image evaluation functions 11

Development of a VS ultrasound diagnostic system with image ...

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11th IEEE Global Conference on Consumer Electronics, GCCE 2022

作者： Zhou, Jiayi Koizumi, Norihiro Nishiyama, Yu Tsumura, Ryosuke Tsukihara, Hiroyuki Matsumoto, Naoki The University of Electro-Communications Department of Mechanical and Intelligent Systems Tokyo Japan The University of Electro-Communications Department of Computer and Network Engineering Tokyo Japan Health and Medical Research Institute National Institute of Advanced Industrial Science and Technology Tokyo Japan The University of Tokyo Graduate School of Engineering Tokyo Japan Nihon University Department of Gastroenterology and Hepatology Tokyo Japan

ISBN: (纸本)9781665492324

An inevitable feature of ultrasound-based diagnoses is that the quality of the ultrasound images produced depends directly on the skill of the physician operating the probe. This is because physicians have to constantly adjust the probe position to obtain a cross-section of the target organ, which is constantly shifting due to patient respiratory motions. Therefore, we developed an ultrasound diagnostic robot that works in cooperation with a visual servo system based on deep learning that will help alleviate the burdens imposed on physicians. Two different image processing methods (BiSeNet V2) were used to detect the target kidney location, as well as to evaluate the appropriateness of the obtained ultrasound images (ResNet 50) in developed system. © 2022 IEEE.

关键词： Visual servoing

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Implementation of an Efficient IoT Enabled Automated Paralysis Healthcare System 8

Implementation of an Efficient IoT Enabled Automated Paralys...

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8th IEEE International Conference on engineering Technologies and Applied sciences, ICETAS 2023

作者： Annepu, Visalakshi Jameel Al-Tamimi, Adnan Naji Aljibori, H.S.S. Challa, Naga Raju Bagadi, Kalapraveen Mohammed, M.N. Abdullah, Oday I. Alfiras, M. Abbas Helmi, Rabab Alayham School of Comp. Science & Eng. VIT-AP University Amaravati India College of Technical Engineering AI-Farahidi University Baghdad Iraq College of Engineering University of Warith Al-Anbiyaa Karbala Iraq Bapatla Engineering College Dept. of Elec. and Comm. Eng. Baptla India College of Engineering Gulf University Mechanical Engineering Department Sanad26489 Bahrain University of Baghdad Dept of Energy Engineering Iraq College of Engineering Gulf University Mechanical Engineering Dept Sanad26489 Bahrain Hamburg University of Technology Institute of Laser and Systems Technologies Hamburg Germany College of Engineering Gulf University Electrical and Electronic Engineering Department Sanad26489 Bahrain School of Graduate Studies Management and Science University Shah Alam Selangor Malaysia

ISBN: (纸本)9798350327090

This system aims to provide comprehensive care to individuals with paralysis, including symptom monitoring, medical treatment, and rehabilitation. The IoT-based system comprises interconnected devices, such as sensors, wearables, and mobile apps that communicate with one another and with healthcare providers. The system can track patients' vital signs, activity levels, and medication adherence, and provide immediate feedback to healthcare providers. Additionally, the system can aid with rehabilitation exercises, send reminders, and gather data on progress to enhance treatment outcomes. The system's intelligent analytics can also assist healthcare providers in detecting patterns in patient behavior and tailoring treatment plans more effectively. Overall, an IoT-based paralysis healthcare system has the potential to transform healthcare delivery by offering personalized, real-time care and monitoring to individuals with paralysis. © 2023 IEEE.

关键词： Internet of things

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Quantum information spreading in random spin chains with topological order

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Physical Review B 2022年第10期106卷 104204-104204页

作者： Takahiro Orito Yoshihito Kuno Ikuo Ichinose Graduate School of Advanced Science and Engineering Hiroshima University 739-8530 Japan Graduate School of Engineering Science Akita University Akita 010-8502 Japan Department of Applied Physics Nagoya Institute of Technology Nagoya 466-8555 Japan

Quantum information spreading and scrambling in many-body systems attract interest these days. Tripartite mutual information (TMI) based on operator-based entanglement entropy (EE) is an efficient tool for measuring them. In this paper, we study random spin chains that exhibit phase transitions accompanying nontrivial changes in topological properties. In their phase diagrams, there are two types of many-body localized (MBL) states and one thermalized regime intervening these two MBL states. Quench dynamics of the EE and TMI display interesting behaviors, providing an essential perspective concerning the encoding of quantum information. In particular, one of the models is self-dual, but information spreading measured by the TMI does not respect this self-duality. We investigate this phenomenon from the viewpoint of spatial structure of the stabilizers. In general, we find that knowledge of the phase diagram corresponding to the qubit system is useful for understanding the nature of quantum information spreading in that system. The connection between the present paper and random circuit of projective measurements and also topological Majorana quantum memory is remarked upon.

关键词： Many-body localization Phase diagrams Quantum channels Topological order Disordered systems Quantum many-body systems Exact diagonalization Spin chains

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On the Sensitivity of Stationary Solutions of Markov Regenerative Processes

SSRN

引用

SSRN 2023年

作者： Zheng, Junjun Okamura, Hiroyuki Dohi, Tadashi Department of Information Systems Engineering Graduate School of Information and Technology Osaka University 1-5 Yamadaoka Osaka Suita565-0871 Japan Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi Hiroshima739-8527 Japan

Due to high power and flexibility, Markov regenerative process (MRGP) is widely used for modeling and evaluating system dependability. However, owing to the renewal nature of MRGP, the analysis of MRGP is challenging. The embedded Markov chain approach can give the stationary solution of MRGP, and the phase expansion approach can provide both stationary and transient solutions to MRGP. Based on these solutions, we can obtain performance or dependability measure as an output of the MRGP model. Then the impact of the change in input factors on the model output can be quantified, which is called local sensitivity. However, the question of how model parameters affect output measure in the MRGP model still remains unclear. Therefore, in this paper, we present an analytical approach for evaluating the local sensitivities of model parameters for the MRGP in the steady state. Particularly, for instance, since system availability is sensitive to the mean of system available time, thus this paper also consider the sensitivity regarding a representative value rather than a model parameter, such as average available time. © 2023, The Authors. All rights reserved.

关键词： Sensitivity analysis

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Theory of phase reduction for systems with higher-order interactions: a route to Kuramoto models on hypergraphs

arXiv

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arXiv 2025年

作者： León, Iván Muolo, Riccardo Hata, Shigefumi Nakao, Hiroya Department of Applied Mathematics and Computer Science Universidad de Cantabria Santander39005 Spain Department of Systems and Control Engineering Tokyo Institute of Technology Tokyo152-8552 Japan Graduate School of Science and Engineering Kagoshima University Kagoshima890-0065 Japan Research Center for Autonomous Systems Materialogy Institute of Innovative Research Tokyo Institute of Technology Yokohama226-8501 Japan

Phase reduction is a powerful technique in the study of nonlinear oscillatory systems. Under certain assumptions, it allows us to describe each multidimensional oscillator by a single phase variable, giving rise to simple phase models such as the Kuramoto model. Classically, the method has been applied in the case where the interactions are only pairwise (two-body). However, increasing evidence shows that interactions in real-world systems are not pairwise but higher-order, i.e., many-body. Although synchronization in higher-order systems has received much attention, analytical results are scarce because of the highly nonlinear nature of the framework. In this paper, we fill the gap by presenting a general theory of phase reduction for the case of higher-order interactions. We show that the higher-order topology is preserved in the phase reduced model at the first order and that only odd couplings have an effect on the dynamics when certain symmetries are present. Additionally, we show the power and ductility of the phase reduction approach by applying it to a population of Stuart-Landau oscillators with an all-to-all configuration and with a ring-like hypergraph topology;in both cases, only the analysis of the phase model can provide insights and analytical results. © 2025, CC BY-NC-ND.

关键词： Topology

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Identifiability and Solvability in Inverse Linear Quadratic Optimal control Problems

引用

Journal of systems science & Complexity 2021年第5期34卷 1840-1857页

作者： LI Yibei WAHLBERG Bo HU Xiaoming Optimization and Systems Theory Department of MathematicsKTH Royal Institute of TechnologySE-10044StockholmSweden Division of Decision and Control School of Electrical Engineering and Computer ScienceKTH Royal Institute of TechnologySE-10044StockholmSweden

In this paper, the inverse linear quadratic(LQ) problem over finite time-horizon is *** the output observations of a dynamic process, the goal is to recover the corresponding LQ cost function. Firstly, by considering the inverse problem as an identification problem, its model structure is shown to be strictly globally identifiable under the assumption of system invertibility. Next, in the noiseless case a necessary and sufficient condition is proposed for the solvability of a positive semidefinite weighting matrix and its unique solution is obtained with two proposed algorithms under the condition of persistent excitation. Furthermore, a residual optimization problem is also formulated to solve a best-fit approximate cost function from sub-optimal observations. Finally, numerical simulations are used to demonstrate the effectiveness of the proposed methods.

关键词： Inverse optimal control linear quadratic regulators model identifiability

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Data-driven Optimal Cooperative Output Regulation of Unknown Linear Discrete-time Multi-agent systems

Data-driven Optimal Cooperative Output Regulation of Unknown...

引用

第35届中国控制与决策会议

作者： Dong Liang Yi Dong Chaoli Wang Engang Tian Department of Control Science and Engineering School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology College of Electronic and Information Engineering Shanghai Research Institute for Intelligent Autonomous Systems Tongji University

The cooperative output regulation problem has been extensively studied on the basis of the distributed observer ***,the majority of the existing research assumes that the dynamics is known *** remove this condition,the cooperative output regulation problem is further solved via the data-driven framework where the dynamics of the plant is ***,a data-driven distributed observer is established to estimate the state of the leader with unknown dynamics subject to external ***,the unknown regulator equations are solved using the iterative recurrent neural network ***,the state-based data-driven distributed control law is synthesized to solve the *** optimal gains are derived by solving convex optimization problems using input and state ***,a numerical example is presented to verify the feasibility of the proposed framework.

关键词： Linear systems multi-agent systems cooperative output regulation data-driven control optimal control

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