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Delays in Model Reduction of Chemical Reaction Networks

IFAC-PapersOnLine 2018年第14期51卷 100-105页

作者： Lipták, György Hangos, Katalin M. Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences P.O. Box 63 BudapestH-1518 Hungary Department of Electrical Engineering and Information Systems University of Pannonia Veszprém Hungary

A novel engineering model reduction method is proposed in this paper that can be applied to a chemical reaction network (CRN) with chains of linear reactions. The reduced model is a delayed CRN with possibly different delays but with less state variables than the original model. As the first step of the model reduction, a decomposition method is also developed to transform chains with joint reactions into independent chains of linear reactions. The well known example of McKeithan's network is used as a case study to illustrate the basic concepts and the design method. © 2018

关键词： Reduction

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Distributed delay model of the McKeithan’s network

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IFAC-PapersOnLine 2019年第7期52卷 33-38页

作者： György Lipták Katalin M. Hangos Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences P.O. Box 63 H-1518 Budapest Hungary Department of Electrical Engineering and Information Systems University of Pannonia Veszprém Hungary

In this paper CRNs containing linear reaction chains with multiple joint complexes were considered in order to obtain an equivalent reduced order delayed CRN model with distributed time delays. For this purpose, our earlier method (Lipták and Hangos (2018)) for decomposing the chains of linear reactions with multiple joint complexes was used together with the "linear chain trick". An analytical expression for the kernel function of the distributed delay was also derived from the reaction rate coefficients of the linear reaction chains. Our approach was demonstrated using the example of the well known McKeithan’s network model of kinetic proofreading.

关键词： process control Delay Chemical Reaction Networks

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Probabilistic Stability Assessment for Active Distribution Grids

Probabilistic Stability Assessment for Active Distribution G...

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Power Tech Conference

作者： Sebastian Liemann Lia Strenge Paul Schultz Holm Hinners Johannis Porst Marcel Sarstedt Frank Hellmann Institute of Energy Systems Energy Efficiency and Energy Economics (ie3) Technical University of Dortmund Dortmund Germany Control Systems Group Technische Universität Berlin Berlin Germany RD4 Potsdam Institute for Climate Impact Research (PIK) Potsdam Germany Institute of Automation University of Bremen Bremen Germany Institute of Electrical Energy Systems Friedrich-Alexander University Erlangen-Nürnberg Germany Institute of Electric Power Systems Leibniz University Hannover Hannover Germany

This paper demonstrates the concept of probabilistic stability assessment on large-signal stability in the use case of short circuits in an active distribution grid. Here, the concept of survivability is applied, which extends classical stability assessments by evaluating the stability and operational limits during transients for a wide range of operating points and failures. For this purpose, a free, open-source, and computationally efficient environment (Julia) for dynamic simulation of power grids is used to demonstrate its capabilities. The model implementation is validated against established commercial software and deviations are minimal with respect to power flow and dynamic simulations. The results of a large-scale survivability analysis reveal i) a broad field of application for probabilistic stability analysis and ii) that new non-intuitive stability correlations can be obtained. Hence, the proposed method shows strong potential to efficiently conduct power system stability analysis in active distribution grids.

关键词： Computational modeling Power system dynamics Power system stability Tools Probabilistic logic Stability analysis Circuit stability

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Regret and Cumulative Constraint Violation Analysis for Distributed Online Constrained Convex Optimization

arXiv

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arXiv 2021年

作者： Yi, Xinlei Li, Xiuxian Yang, Tao Xie, Lihua Chai, Tianyou Johansson, Karl H. The Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm10044 Sweden The Digital Futures Stockholm10044 Sweden The Department of Control Science and Engineering College of Electronics and Information Engineering The Shanghai Research Institute for Intelligent Autonomous Systems Tongji University Shanghai China The State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang110819 China School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore

This paper considers the distributed online convex optimization problem with time-varying constraints over a network of agents. This is a sequential decision making problem with two sequences of arbitrarily varying convex loss and constraint functions. At each round, each agent selects a decision from the decision set, and then only a portion of the loss function and a coordinate block of the constraint function at this round are privately revealed to this agent. The goal of the network is to minimize the network-wide loss accumulated over time. Two distributed online algorithms with full-information and bandit feedback are proposed. Both dynamic and static network regret bounds are analyzed for the proposed algorithms, and network cumulative constraint violation is used to measure constraint violation, which excludes the situation that strictly feasible constraints can compensate the effects of violated constraints. In particular, we show that the proposed algorithms achieve O(T max{κ,1-κ}) static network regret and O(T 1-κ/2) network cumulative constraint violation, where T is the time horizon and κ ∈ (0, 1) is a user-defined trade-off parameter. Moreover, if the loss functions are strongly convex, then the static network regret bound can be reduced to O(T κ). Finally, numerical simulations are provided to illustrate the effectiveness of the theoretical results. Copyright © 2021, The Authors. All rights reserved.

关键词： Economic and social effects

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Comparison of Jinzhen oral liquid and ambroxol hydrochloride and clenbuterol hydrochloride oral solution in the treatment of acute bronchitis in children:A multicenter,non-inferiority,prospective,randomized controlled trial

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Acta Pharmaceutica Sinica B 2024年第12期14卷 5186-5200页

作者： Qinhua Fan Chongming Wu Yawei Du Boyang Wang Yanming Xie Zeling Zhang Wenquan Su Zizhuo Wang Changchang Xu Xueke Li Ying Ding Xinjiang An Jing Chen Yunying Xiao Rong Yu Nan Li Juan Wang Yiqun Teng Hongfen Lv Nian Yang Yuling Wen Xiaoli Huang Wei Pan Yufeng Liu Xueqin Xi Qianye Zhao Changshan Liu Jian Xu Haitao Zhang Lie Zhuo Qiangquan Rong Yu Xia Qin Shen Shao Li Junhong Wang Shengxian Wu Dongzhimen Hospital Beijing University of Chinese MedicineBeijing 100700China School of Chinese Materia Medica Tianjin University of Traditional Chinese MedicineTianjin 301617China Institute of Basic Research in Clinical Medicine China Academy of Chinese Medical SciencesBeijing 100700China The First Affiliated Hospital of Henan University of CM Zhengzhou 450099China Xuzhou Children’s Hospital Xuzhou 221002China Women and Children’s Health Care Hospital of Linyi Linyi 276016China Taian Maternity and Child Health Hospital Taian 271001China Wuxi No.8 People’s Hospital Group Wuxi 214011China Shi Jia Zhuang Maternity&Child Healthcare Hospital Shijiazhuang 050006China The First People’s Hospital of Lianyungang Lianyungang 222002China Jiaxing Second Hospital Jiaxing 314001China Jiangyan Hospital of Traditional Chinese Medicine Taizhou 225599China Linshu County People’s Hospital Linyi 276799China Qiqihar Hospital of Traditional Chinese Medicine Qiqihar 161005China Liuzhou Maternal and Child Health Care Hospital Liuzhou 545001China Wuxi Hospital of Traditional Chinese Medicine Wuxi 214071China The Fourth Affiliated Hospital of Liaoning University of Traditional Chinese Medicine Shenyang 110103China Shandong Maternal and Child Health Hospital Jinan 250014China Lianyungang Maternal and Child Health Hospital Lianyungang 222062China The Second Hospital of Tianjin Medical University Tianjin 300211China Qidong Maternal and Child Health Hospital Qidong 226299China Suzhou Integrated Traditional and Western Medicine Hospital Suzhou 215101China Nanjing Drum Tower Hospital Group Suqian Hospital Nanjing 210008China Nanjing Gaochun People’s Hospital Nanjing 211302China Nanjing Lishui People’s Hospital Nanjing 211299China The Affiliated Suqian First People’s Hospital of Nanjing Medical University Suqian 223812China Institute for TCM-X MOE Key Laboratory of BioinformaticsBioinformatics DivisionBNRistDepartment of AutomationTsinghua UniversityBeijing 100084China State Key Laboratory on Technologies for

The comparison between traditional Chinese medicine Jinzhen oral liquid(JZOL)and West-ern medicine in treating children with acute bronchitis(AB)showed encouraging *** trial eval-uated the efficacy and safety of the JZOL for improving cough and expectoration in children with AB.480 children were randomly assigned to take JZOL or ambroxol hydrochloride and clenbuterol hydrochloride oral solution for 7 *** primary outcome was time-to-cough *** median time-to-cough resolution in both groups was 5.0 days and the antitussive onset median time was only 1 *** random-ized controlled trial showed that JZOL was not inferior to cough suppressant and phlegm resolving western medicine in treating cough and sputum and could comprehensively treat respiratory and systemic discom-fort *** with clinical trials,the mechanism of JZOL against AB was uncovered by network target analysis,it was found that the pathways in TRP channels like IL-1b/IL1R/TRPV1/TRPA1,NGF/TrkA/TRPV1/TRPA1,and PGE2/EP/PKA/TRPV1/TRPA1 might play important *** ex-periments further confirmed that inflammation and the immune regulatory effect of JZOL in the treatment of AB were of vital importance and TRP channels were the key mechanism of action.

关键词： Acute bronchitis Jinzhen oral liquid Complementary and alternative medicine Clinical trial Network target analysis

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control Strategy For A Multiple Hearth Furnace

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IFAC-PapersOnLine 2018年第21期51卷 189-194页

作者： Gomez, Fuentes J.V. Jämsä-Jounela, S.L. Aalto University School of Chemical Technology Research group on Process Control and Automation P.O. Box 16100 AaltoFI-00076 Finland

This paper presents and discusses a mineralogy-driven control strategy for a multiple hearth furnaces in kaolin production. The objective of the advanced control is to maximize capacity and to minimize energy consumption while preserving the desired product quality. The control is based on two main soft sensors: the mullite content indicator for capacity improvement and the spinel phase reaction rate indicator for energy use reduction. In this simulation study, the control strategy is tested and compared with an industrial controller based on a proportional-integral scheme as a benchmark. The results show that the capacity of the process is significantly improved and the energy use is notably diminished. © 2018

关键词： Quality control Calcination Energy utilization Furnaces Image quality Mullite Silicate minerals Two term control systems Advanced control Capacity improvement control performance control strategies Hearth furnace Industrial controllers Proportional integral Soft sensors

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Time-delay assisted mechanism and adaptive LSTM hybrid train braking model of heavy haul trains

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control Engineering Practice 2025年 163卷

作者： Qiang Liu Kexuan Xu Yating Fu Jiang Liu Ling Liu State Key Laboratory of Synthetical Automation for Process Industries (Northeastern University) Shenyang 110819 China Key Laboratory of Advanced Control and Optimization of Jiangxi Province Nanchang 330013 China School of Electrical and Automation Engineering East China Jiaotong University Nanchang 330013 China Frontiers Science Center for Smart High-speed Railway System Beijing 100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China Beijing National Railway Research & Design Institute of Signal Communication Group Company Beijing 100070 China

The train braking model (TBM) that describes the dynamic relations of operation speed, mileage, and control force is essential for achieving stable operation and precise stopping of heavy haul trains (HHTs). However, it is difficult to establish the TBM of HHTs due to complex characteristics: (i) the long body and air braking process of the HHTs may lead to unexpected time-delays of control force; and (ii) there are significant unmodeled dynamics caused by rough tracks and external poor environment. Traditional TBM does not take into account the unmodeled dynamics and time-delays caused by air transmission during braking. To address these issues, this study proposes a data mechanism hybrid modeling strategy, which incorporates a braking time-delay assisted mechanism model and an adaptive long and short-term memory (LSTM) model. A new Bayesian optimization based time-delay estimation method is first proposed to determine unknown time-delays of each carriage and the estimated time-delays are incorporated to generate the multi-point-mass kinetic mechanism model. Moreover, the error of the mechanism-driven model is adaptively compensated by a sliding window LSTM model to conduct the unmodeled dynamics. The effectiveness of the proposed method is demonstrated using the field data.

关键词：

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A hybrid model based on stacking and multi-correction mechanisms for urban water demand prediction ⁎

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IFAC-PapersOnLine 2020年第2期53卷 16685-16690页

作者： Yang Lan Jingcheng Wang Miaoshun Bai Ibrahim Brahmia Haotian Xu Piao Hu Yuhao Long Yeming Zhang Dept. of Automation Shanghai Jiaotong University Key Laboratory of System Control and Information Processing Ministry of education of China Shanghai 200240 China. Autonomous Systems and Intelligent Control International Joint Research Center Xi’an Technological University Xi’an Shaanxi710021 China. Shanghai Municipal engineering Design Institute (Group) Co. Ltd.

Water demand prediction is the key link for the effective operation of urban intelligent water supply system. Since the non-linearity and complex variability of water consumption, it is difficult for traditional water demand prediction models to guarantee high accuracy for a long period. Different holiday types and even tiny changes in temperatures can affect urban water demand seriously. This paper proposes a Stacking-based hybrid model which integrates multi-correction mechanisms to address these problems. A better stacking model is proposed to minimize the generalization error. The stability and reliability of predictions are improved through the design of multi-correction mechanisms such as high temperature weather compensation feature, holiday-type correction model and water quantity fluctuation correction model. Comparing different models before and after stacking also before and after correcting, the prediction accuracy of the proposed hybrid model is much higher and the predictions are more stable and reliable.

关键词： Water supply system Prediction methods Hybrid models Stacking methods Multi-correction mechanisms Neural-network models Time-series analysis

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A New Method for Deriving Weights in group Fuzzy Analytic Hierarchy process and Evaluation Measures

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IFAC-PapersOnLine 2020年第2期53卷 7941-7946页

作者： Lin Che Yeming Zhang Jingcheng Wang Miaoshun Bai Dept. of Automation Shanghai Jiaotong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China Shanghai Municipal Engineering Design Institute (Group) Co. Ltd. China Autonomous Systems and Intelligent Control International Joint Research Center Xi’an Technological University Xi’an Shaanxi 710021 China

The paper discusses fuzzy comparison matrices, consistency check, weight prioritization methods and weight evaluation methods in fuzzy group analytic hierarchy process. There are various methods of weight prioritization, however, they are not critically evaluated. In the paper, two measures are introduced for the evaluation of the group weights. Then, a new method is proposed to improve the process of deriving weights and use it in an application compared to another common three methods. Our results show that the new method is a good method for deriving weights of indexes.

关键词： group Fuzzy AHP Ari-Geo Method Assessment Measure Fuzzy Consistency Check Triangular Fuzzy Number

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An Energy-Efficient Context Aware Solution for Environmental Assessment ⁎

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IFAC-PapersOnLine 2020年第5期53卷 756-761页

作者： Isabela Birs Cristina Muresan Ioan Nascu Clara Ionescu Ghent University Faculty of Engineering and Architecture Research Group of Dynamical Systems and Control Tech Lane Science Park 125 B-9052 Ghent Belgium EEDT Decision & Control Flanders Make Consortium Tech Lane Science Park 131 B-9052 Ghent Belgium Department of Automation Technical University of Cluj-Napoca Memorandumului 28 Cluj-Napoca Romania

The paper focuses on presenting the advantages of context aware cyber-physical systems through an experimental platform capable of assessing its surroundings and self-performing decisions. The context aware paradigm is present in the control law implementation with various advantages such as energy efficiency as well as in the environmental measurements that trigger the robot to perform context-relevant decisions. The platform provides high versatility and the results presented throughout the study can be adapted to a manifold of multidisciplinary fields.

关键词： Submerged Vehicle Context Awareness Environmental Assessment Event-based control

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