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An improved multi-stage nonlinear model predictive control with application to semi-batch polymerization

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An improved multi-stage nonlinear model predictive control w...

Asian control Conference

作者： Jinggao Sun Wuyue Yuan Rui Xue Mengling Wang Key Laboratory of Advanced Control and Optimization for Chemical Processes (East China University of Science and Technology) Ministry of Education Shanghai China School of Information Science and Engineering East China University of Science and Technology Shanghai China

ISBN: (纸本)9781728102634

Nonlinear model predictive control (NMPC) has been widely applied in the chemical industry for its performance of dealing with the multiple input multiple output problem (MIMO) and handling constraints. However, the performance of NMPC would be affected by the accuracy of the model. The NMPC controller has to be robust to uncertainties in the model. In this paper, the scenario-tree based on multi-stage NMPC approach has been applied to the semi-batch polymerization reactor. In this approach, in order to ensure the reasonableness of the uncertain variables and scenario tree number, a Monte Carlo-based second-order nonlinear model and K-means cluster algorithm have been proposed. The weights of each scenario branches are also considered into variable. The simulation results show that the performance of the improved method is better and the variable weights has a good ability of improving the performance of controller.

关键词： Uncertainty optimization Polymers Inductors process control Monte Carlo methods chemicals

Discrete-phase-randomized measurement-device-independent quantum key distribution

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arXiv 2020年

作者： Cao, Zhu Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education East China University of Science and Technology Shanghai200237 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai200092 China

Measurement-device-independent quantum key distribution removes all detector-side attacks in quantum cryptography, and in the meantime doubles the secure distance. The source side, however, is still vulnerable to various attacks. In particular, the continuous phase randomization assumption on the source side is normally not fulfilled in experimental implementation and may potentially open a loophole. In this work, we first show that indeed there are loopholes for imperfect phase randomization in measurement-device-independent quantum key distribution by providing a concrete attack. Then we propose a discrete-phase-randomized measurement-device-independent quantum key distribution protocol as a solution to close this source-side loophole. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum cryptography

Constant-round multi-party quantum computation for constant parties

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arXiv 2020年

One of the central themes in classical cryptography is multi-party computation, which performs joint computation on multiple participants’ data while maintaining data privacy. The extension to the quantum regime was proposed in 2002, but despite two decades of research, the current state-of-the-art multi-party quantum computation protocol for a fixed number of parties (even 2 parties) requires unbounded rounds of communication, which greatly limit its practical usage. In this work, we propose the first constant-round multi-party quantum computation protocol for a fixed number of parties against specious adversaries, thereby significantly reducing the required number of rounds. Our work constitutes a key step towards practical implementation of secure multi-party quantum computation, and opens the door for practitioners to be involved in this exciting field. The result of our work has wide implications to quantum fidelity evaluation, quantum machine learning, quantum voting, and distributed quantum information processing. © 2020, CC-BY.

关键词： Quantum optics

control of continuous switched systems based on input and output strict passivity

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IET control Theory & Applications 2018年第14期12卷 1951-1955页

作者： Zairui Gao Ziyun Wang Zhicheng Ji Yunlong Liu Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Jiangnan University Wuxi People's Republic of China College of Information and Control Engineering Weifang University Weifang People's Republic of China

In this study, the authors study the issue of control of continuous switched systems based on the input and output strict passivity. First of all, for switched non-linear systems, by constructing non-linear controllers and an appropriate switching rule, a sufficient condition is given to guarantee the existence of a solution to the control problem based on the multiple Lyapunov functions method. It only requires that each subsystem exhibits input and output strict passivity in the activation interval, and not in the whole time domain. Next, for switched linear systems, a sufficient condition is obtained to guarantee the existence of a solution to the control problem based on the linear matrix inequality, and the controllers with explicit expressions of subsystems are designed. Finally, two examples are given to verify the feasibility and effectiveness of the results.

关键词： asymptotic stability Lyapunov methods time-varying systems nonlinear control systems linear matrix inequalities continuous time systems linear systems control system synthesis $H∞ control continuous switched systems input output strict passivity authors study switched nonlinear systems constructing nonlinear controllers appropriate switching rule sufficient condition control problem switched linear systems

Representation evaluation block-based teacher-student network for the industrial quality-relevant performance modeling and monitoring

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arXiv 2021年

作者： Yang, Dan Peng, Xin Lu, Yusheng Huang, Haojie Zhong, Weimin Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai200237 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai200092 China

Quality-relevant fault detection plays an important role in industrial processes, while the current quality-related fault detection methods based on neural networks main concentrate on process-relevant variables and ignore quality-relevant variables, which restrict the application of process monitoring. Therefore, in this paper, a fault detection scheme based on the improved teacher-student network is proposed for quality-relevant fault detection. In the traditional teacher-student network, as the features differences between the teacher network and the student network will cause performance degradation on the student network, representation evaluation block (REB) is proposed to quantify the features differences between the teacher and the student networks, and uncertainty modeling is used to add this difference in modeling process, which are beneficial to reduce the features differences and improve the performance of the student network. Accordingly, REB and uncertainty modeling is applied in the teacher-student network named as uncertainty modeling teacher-student uncertainty autoencoder (TSUAE). Then, the proposed TSUAE is applied to process monitoring, which can effectively detect faults in the process-relevant subspace and quality-relevant subspace simultaneously. The proposed TSUAE-based fault detection method is verified in two simulation experiments illustrating that it has satisfactory fault detection performance compared to other fault detection methods. Copyright © 2021, The Authors. All rights reserved.

关键词： Wastewater treatment

Numerical Simulation of the Gas and Solid Hydrodynamic Behaviors in a Pilot-plant Scale Ethylene Polymerization Fluidized-bed Reactor

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Numerical Simulation of the Gas and Solid Hydrodynamic Behav...

Asian Polyolefin Workshop (APO2013)2013亚洲聚烯烃研讨会

作者： Yu Che Zhou Tian Boping Liu State Key Laboratory of Chemical Engineering East China University of Science and Technology Meilong Road 130 Shanghai 200237 Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai 200237 P.R.China

Visual tracking via adaptive observation weight

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Visual tracking via adaptive observation weight

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Xing Liu Ying Chen Chun-Jian Hua Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Jiangnan University Wuxi Province China Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Key Jiangnan University University Wuxi Province China

ISBN: (纸本)9781509003914

To solve the problem of poor robustness and low effectiveness of visual tracking in complex scenes, a novel target tracking algorithm based on adaptive observation weight is proposed in this paper. First of all, a weighted observation model is established by linear visual tracking representation. Then an iterative optimization algorithm is proposed to obtain the parameters of the model, and adaptively update the weight matrix to eliminate negative influences of observation outliers. Finally, an effective likelihood evaluation function is adopted to track the object accurately and robustly. Analyzing both qualitatively and quantitatively on several challenging video sequences demonstrate that the algorithm outperforms other state-of-the-art tracking algorithms in tracking accuracy and robustness.

关键词： Target tracking Adaptation models optimization Visualization Algorithm design and analysis Encoding

Counterfactual universal quantum computation

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arXiv 2020年

Universal quantum computation is usually associated with interaction among two-level quantum subsystems, as this interaction is commonly viewed as a necessity to achieve universal quantum computation. In this work, we show that, contrary to this intuition, universal quantum computation can be achieved without interaction among initially independent two-level quantum subsystems. We call it counterfactual universal quantum computation. As special cases, we show how to achieve counterfactual communication of quantum states, counterfactual quantum swapping, and counterfactual quantum erasure codes. To ease practical implementation, we analyze counterfactual universal quantum computation with realistic devices, including the effects of finite execution time, photon loss, and atom missing. Besides the theoretical interest of illustrating the mysterious and counterintuitive nature of quantum physics, our work has practical applications to color imaging of ancient arts, upon which light is forbidden to shine. © 2020, CC-BY.

关键词： Quantum optics

Non-fragile H∞ Static Output Feedback control for Discrete-time Linear Systems

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Non-fragile H∞ Static Output Feedback Control for Discrete-...

2011 China control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Dawei Ding Xiaoli Li Yixin Yin Dexin Liu School of Automation and Electrical Engineering Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education) University of Science and Technology Beijing Beijing 100083 China

This paper investigates the problem of non-fragile static output feedback control (SOF) design for discrete-time linear systems. Interval type of additive gain variations to reflect imprecision in controller implementation is considered. The non-fragile SOF controller design is firstly formulated as a robust convex problem. Then a deterministic algorithm and a randomized one are proposed to solve the obtained robust convex problem. These two algorithms complements each other. The deterministic algorithm is suitable for systems with low dimensions, while the randomized one is applicable for systems with high dimensions. In addition, the randomized algorithm can alleviate the conservatism of the deterministic one. Two examples are given to show the effectiveness of the proposed method.

关键词： Non-fragile Static output feedback Randomized algorithms.