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American control Conference (ACC)

作者： Young Sam Song Sung-Ha Kwon Seung Kyu Park Do-Chang Oh Eun Tae Jeung Department of Control and Instrumentation Engineering Changwon NatE28099l University Kyongnam South Korea School of Mechatronics Engineering Changwon NatE28099l University South Korea Electronic Information Technology and Computer Science Konyang University South Korea

ISBN: (纸本)0780364953

This paper presents a sliding mode control (SMC) design method for single input linear systems with uncertainties and time delay in the state. We define a sliding surface for the augmented system with a virtual state which is defined from the nominal system. We make a virtual state from LQR (linear quadratic regulator) gain and the states of the nominal system. We construct a controller that combines SMC with LQR controller. The proposed sliding mode controller guarantees the stability of the overall closed-loop system.

关键词： Sliding mode control control systems Uncertainty Delay effects Optimal control Delay systems Robust control Design methodology State feedback Instruments

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A comparison of stochastic and adaptation programming methods for long term generation and transmission co-optimization under uncertainty

A comparison of stochastic and adaptation programming method...

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Annual North-American Power Symposium

作者： Patrick Maloney Oluwaseyi Olatujoye Ali Jahanbani Ardakani Diego Mejïa-Giraldo James McCalley Universidad del Valle Grupo de Investigación en Control Industrial Cali Colombia Department of Electrical Engineering Kasetsart University Bangkok Thailand School of Information Computer and Communication Technology Sirindhorn International Institute of Technology Thammasat University Pathum Thani Thailand

In this work a recently developed mathematical programming formulation called adaptation is compared with the widely used stochastic programming method in the context of electric infrastructure expansion planning. Although the structure of the adaptation method closely resembles that of a generic stochastic program it diverges from the temporal conventions of traditional electric infrastructure formulations. While traditional stochastic programming formulations restrict first and later stage capacity investments to separate time periods, the first and later stage capacity investments in adaptation overlap in time. Additionally, recourse decisions for all scenarios are defined relative to the central core trajectory in the same time period rather than the node at the previous time period in the stochastic programming scenario tree. After an in-depth discussion of stochastic programming and adaptations' formulations, a six bus simulation is provided to facilitate a more concrete comparison of the two methods. Uncertainties considered in the simulation include, wind and solar build costs, carbon taxes, demand and peak demand growth, natural gas fuel prices, and transmission costs.

关键词： Investment Programming Stochastic processes Planning Uncertainty Linear programming Adaptation models

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Frequency Domain Separation of DAS Multi-Source Aliased Signals

Frequency Domain Separation of DAS Multi-Source Aliased Sign...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Huaxin Gu Shuaiqi Liu Feihong Yu Deyu Xu Xingwei Chen Liyang Shao Yu Wu Haifeng Zhang College of Innovation and Entrepreneurship Southern University of Science and Technology Shenzhen China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen China School of Information and Communication Engineering University of Electronic Science and Technology Chengdu China Advanced Measurement and Control and Equipment R&D Center Research Institute of Tsinghua University Chengdu China

In this paper, fast independent vector analysis (FastIVA) based on convolutional aliasing model is proposed to separate the aliased signals collected by distributed acoustic sensing (DAS) system, and the time-frequency entropy is used to judge the separation performance. The results show that the time-frequency entropy interval of the separated signals and the source signals correspond to each other, which means that the aliased signals are separated. This method is used to improve the accuracy of DAS system signal detection and recognition in complex real environment, and reduce the number of false alarm events.

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OLMNE+FT: Multiplex network embedding based on overlapping links

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Physica A: Statistical Mechanics and its Applications 2022年 596卷

作者： Liang, Bo Wang, Lin Wang, Xiaofan Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronic Engineering and Automation Shanghai University Shanghai China

Network embedding or graph representation learning has recently attracted more researchers’ attention and achieved state-of-the-art performance in many areas and tasks. Nevertheless, most of these methods are targeted for monolayer networks and ignore the multiplexity property of nodes which refers to the multifaceted relationships between two elements. Multiplexity provides multiple types of auxiliary information to refine the characteristics of nodes and can be modeled as a multiplex network. In this study, we propose a multiplex network embedding algorithm to learn a unique embedding for each node in each layer or each relation type. A biased path-dependency random walk strategy is adopted to generate node sequences for integrating different types of relations between nodes, which pays more attention to overlapping links and makes neighbor nodes in the sampling sequence more similar to each other. Then the skip-gram model is used to learn an overall embedding over node sequences. To strengthen the expressive power of the embedding in a specific layer, a fine tuning strategy with low time cost is employed to make the embedding comprise information of nodes at this particular layer and preserve their distinctive properties, and the unique embedding is achieved ultimately. To verify the effectiveness of our algorithms, we validate the performance of our algorithm and other baseline methods in the link prediction task. The results demonstrate that the learned embedding can capture the interlayer relationships and preserve the specific characteristics of nodes, and our algorithms can stably obtain better or comparable performance compared with other methods. © 2022 Elsevier B.V.

关键词： Network embeddings

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A hybrid algorithm based on teaching-learning-based optimization and newton method for solving nonlinear equations

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ICIC Express Letters 2016年第1期10卷 103-109页

作者： Li, Xia Niu, Peifeng Zhao, Litong Li, Guoqiang Liu, Jianping Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University No. 438 West Hebei Avenue Qinhuangdao China Department of Mathematics and Information Science Hebei Normal University of Science and Technology No. 360 West Hebei Avenue Qinhuangdao China

Solving nonlinear equations is an important problem in engineering eld. Therefore, the study of ecient algorithm is of great signicance. Teaching-LearningBased Optimization (TLBO) has the advantages of simple algorithm, less parameters, strong global convergence ability and insensitivity to initial point, but it is weak at local optimization and slow later convergence. On the other hand, Newton method has the advantage of local deep search and fast convergence rate, but it is sensitive to the initial point. Therefore, considering advantages and disadvantages of two methods above, this paper proposes a hybrid algorithm (TNHA) based on the TLBO and Newton method for solving nonlinear equations. The hybrid algorithm both combines all these merits of the TLBO and Newton method but does not have the defects. Finally, numerical examples verify the eciency of the TNHA. © 2016 ICIC International.

关键词： Newton-Raphson method

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Complexity Reduction for Resilient State Estimation of Uniformly Observable Nonlinear Systems

arXiv

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arXiv 2023年

作者： Kim, Junsoo Lee, Jin Gyu Sandberg, Henrik Johansson, Karl H. Department of Electrical and Information Engineering Seoul National University of Science and Technology Korea Republic of The Division of Decision and Control System KTH Royal Institute of Technology Sweden Digital Futures Inria University of Lille CNRS UMR 9189 - CRIStAL LilleF-59000 France

A resilient state estimation scheme for uniformly observable nonlinear systems, based on a method for local identification of sensor attacks, is presented. The estimation problem is combinatorial in nature, and so many methods require substantial computational and storage resources as the number of sensors increases. To reduce the complexity, the proposed method performs the attack identification with local subsets of the measurements, not with the set of all measurements. A condition for nonlinear attack identification is introduced as a relaxed version of existing redundant observability condition. It is shown that an attack identification can be performed even when the state cannot be recovered from the measurements. As a result, although a portion of measurements are compromised, they can be locally identified and excluded from the state estimation, and thus the true state can be recovered. Simulation results demonstrate the effectiveness of the proposed scheme. Copyright © 2023, The Authors. All rights reserved.

关键词： State estimation

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Non-Markovian-environment-induced anomaly in steady-state quantum coherence

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Physical Review A 2024年第5期110卷 052220-052220页

作者： Arapat Ablimit Zhao-Ming Wang Feng-Hua Ren Paul Brumer Lian-Ao Wu College of Physics and Optoelectronic Engineering Ocean University of China Qingdao 266100 China School of Information and Control Engineering Qingdao University of Technology Qingdao 266520 China Chemical Physics Theory Group Department of Chemistry and Center for Quantum Information and Quantum Control University of Toronto Toronto Ontario Canada M5S 3H6 Department of Physics University of the Basque Country UPV/EHU 48080 Bilbao Spain IKERBASQUE Basque Foundation for Science 48013 Bilbao Spain EHU Quantum Center University of the Basque Country UPV/EHU Leioa 48940 Biscay Spain

Environment-induced steady-state quantum coherence (SSQC) is a captivating phenomenon that challenges conventional understandings of decoherence. In this article, we delve into the foundational aspects of environment-induced SSQC, shedding light on its emergence within the framework of system-bath interactions. Starting from a microscopic system-bath-coupled model, we investigate the dependence of SSQC on environmental memory effects, the bath temperature, the system-bath coupling strength, and squeezing parameters. Our findings reveal that the environment not only acts as a generator but also as a disruptor of SSQC. A peak will exist for a non-Markovian bath, which is a result of competition between these two mechanisms. Interestingly, the peak disappears in the Markovian case. Additionally, we observe that the generated SSQC can be further amplified through environment squeezing.

关键词： Chemical Physics & Physical Chemistry Open quantum systems Open quantum systems & decoherence

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Terahertz channel power and BER performance in rain

arXiv

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arXiv 2024年

作者： Song, Yuheng Cui, Jiayuan Liu, Guohao Zhao, Jiabiao Zhang, Mingxia Liu, Jiacheng Li, Da Li, Peian Yao, Chen Song, Fei Liang, Hong Ma, Jianjun Beijing Key Laboratory of Millimeter and Terahertz Wave Technology Beijing Institute of Technology Beijing100081 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China Radar Operation Control Department China Meteorological Administration Beijing100044 China

Terahertz (THz) communications have emerged as a promising technology for 6G networks due to their potential for achieving terabit-per-second data rates. However, the impact of rainfall on THz channel characteristics remains incompletely understood, particularly regarding power attenuation mechanisms and bit error rate (BER) performance. This article presents a systematic measurement-based and theoretical investigation of line-of-sight (LoS) THz channel behavior under rainfall conditions, methodically examining both power attenuation mechanisms and bit error rate (BER) performance. Our experimental campaign, conducted at frequencies of 220-230 GHz over a 54-meter outdoor channel, is complemented by analytical frameworks incorporating ITU-R and Mie scattering models. The study reveals that while rain induces significant power attenuation, multipath scattering effects remain minimal, with Rician K-factors maintaining high values. Notably, we observe substantial variations in power loss under constant rain rates, attributed to dynamic changes in raindrop size distribution. Comparative analysis demonstrates superior BER performance of Quadrature Amplitude Modulation (QAM) in rainfall conditions, while revealing increased environmental sensitivity at higher frequencies. These findings underscore the necessity for adaptive modulation schemes and strategic frequency planning in future THz communication systems. © 2024, CC BY.

关键词： Quadrature amplitude modulation

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Experimental Demonstration of High-Rate Measurement-Device-Independent Quantum Key Distribution over Asymmetric Channels

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Physical Review Letters 2019年第16期122卷 160501-160501页

作者： Hui Liu Wenyuan Wang Kejin Wei Xiao-Tian Fang Li Li Nai-Le Liu Hao Liang Si-Jie Zhang Weijun Zhang Hao Li Lixing You Zhen Wang Hoi-Kwong Lo Teng-Yun Chen Feihu Xu Jian-Wei Pan Shanghai Branch Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Shanghai 201315 China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 People’s Republic of China Centre for Quantum Information and Quantum Control (CQIQC) Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Measurement-device-independent quantum key distribution (MDI-QKD) can eliminate all detector side channels and it is practical with current technology. Previous implementations of MDI-QKD all used two symmetric channels with similar losses. However, the secret key rate is severely limited when different channels have different losses. Here we report the results of the first high-rate MDI-QKD experiment over asymmetric channels. By using the recent 7-intensity optimization approach, we demonstrate>10×higher key rate than the previous best-known protocols for MDI-QKD in the situation of large channel asymmetry, and extend the secure transmission distance by more than 20–50 km in standard telecom fiber. The results have moved MDI-QKD towards widespread applications in practical network settings, where the channel losses are asymmetric and user nodes could be dynamically added or deleted.

关键词： Quantum cryptography Quantum networks

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Inversion of separable kernel operators in coupled differential-functional equations and application to controller synthesis

arXiv

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arXiv 2017年

作者： Miao, Guoying Peet, Matthew M. Gu, Keqin School of Information and Control Nanjing University of Information Science and Technology Nanjing210044 China School of Matter Transport and Energy Arizona State University TempeAZ85287 United States Department of Mechanical and Industrial Engineering Southern Illinois University EdwardsvilleIL62026 United States

This article presents the inverse of the kernel operator associated with the complete quadratic Lyapunov-Krasovskii functional for coupled differential-functional equations when the kernel operator is separable. Similar to the case of time-delay systems of retarded type, the inverse operator is instrumental in control synthesis. Unlike the power series expansion approach used in the previous literature, a direct algebraic method is used here. It is shown that the domain of definition of the infinitesimal generator is an invariant subspace of the inverse operator if it is an invariant subspace of the kernel operator. The process of control synthesis using the inverse operator is described, and a numerical example is presented using the sum-of-square formulation. Copyright © 2017, The Authors. All rights reserved.

关键词： Time delay

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