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Two-Stage OD Flow Prediction for Emergency in Urban Rail Transit

IEEE Transactions on Intelligent Transportation Systems 2024年第1期25卷 920-928页

作者： Zhu, Guangyu Ding, Jiacun Wei, Yun Yi, Yang Xu, Sendren Sheng-Dong Wu, Edmond Q. Beijing Jiaotong University Key Lab. of Transport Industry of Big Data Application Technologies for Comprehensive Transport The Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Beijing100044 China Beijing Mass Transit Railway Operation Corporation Ltd. Beijing100014 China Yangzhou University College of Information Engineering Yangzhou225127 China National Taiwan University of Science and Technology Automation and Control Center The Graduate Institute of Automation and Control Taipei106335 Taiwan Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China The Shanghai Engineering Research Center of Intelligent Control and Management Department of Automation Shanghai200240 China

Urban rail transit (URT) is vulnerable to natural disasters and social emergencies including fire, storm and epidemic (such as COVID-19), and real-time origin-destination (OD) flow prediction provides URT operators with important information to ensure the safety of URT system. However, hindered by the high dimensionality of OD flow and the lack of supportive information reflecting the real-time passenger flow changes, study in this area is at the beginning stage. A novel model consisting of two stages is proposed for OD flow prediction. The first stage predicts the inflows of all stations by Long Short-Term Memory (LSTM) in real time, where the dimension is reduced compared with predicting OD flows directly. In the second stage, the notion of separation rate, namely, the proportion of inbound passengers bounding for another station, is estimated. Finally, The OD flow is predicted by multiplying the inflow and separation rate. Experiments based on Hangzhou Metro dataset show the proposed model outperforms the contrast model in weighted mean average error (WMAE) and weighted mean square error (WMSE). Results also suggest that the proposed prediction model performs better on weekdays than on weekends, and with greater accuracy on larger OD flows. © 2000-2011 IEEE.

关键词： Forecasting

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P-tuned FeN_(2)binuclear sites for boosted CO_(2)electro-reduction

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Journal of Energy Chemistry 2025年第2期101卷 816-824,I0018页

作者： Cao Guo Sanshuang Gao Jun Li Menglin Zhou Abdukader Abdukayum Qingquan Kong Yingtang Zhou Guangzhi Hu School of Materials and Energy Institute for Ecological Research and Pollution Control of Plateau LakesSchool of Ecology and Environmental ScienceYunnan UniversityKunming 650504YunnanChina Xinjiang Key Laboratory of Novel Functional Materials Chemistry College of Chemistry and Environmental SciencesKashi UniversityKashi 844000XinjiangChina School of Mechanical Engineering Chengdu UniversityChengdu 610106SichuanChina National Engineering Research Center for Marine Aquaculture Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004ZhejiangChina

The recycling of CO_(2)through electrochemical processes offers a promising solution for alleviating the greenhouse effect;however,the activation of CO_(2)and desorption of^(*)CO in electrocatalytic CO_(2)reduction(ECR)frequently encounter high energy barriers and competitive hydrogen evolution reactions(HERs),which are urgent problems that need to be *** this study,a catalyst(P100-Fe-N/C)with homogeneous P-tuned FeN_(2)binuclear sites(N_(2)PFe-FePN_(2))was successfully synthesised,demonstrating satisfactory performance in the ECR to CO.P100-Fe-N/C attains a peak FECOof 98.01%and a normalized TOF of 664.7 h-1at-0.7 VRHE,surpassing the performance of the Fe binuclear catalyst without P and singleatoms *** the MEA cell,a FECOexceeding 90%can still be *** functional theory analysis indicates that the asymmetric coordination configuration induced by the incorporation of P facilitates a reduction in the system's *** modulation of P results in the d-band centre of the catalyst being positioned closer to the Fermi level,which facilitates the interaction of the catalyst with CO_(2),allowing more electrons to be injected into the CO_(2)molecule at the Fe binuclear sites and inhibiting the *** P-tuned FeN_(2)binuclear sites effectively lower the^(*)CO desorption barrier.

关键词： Electrocatalysis Diatomic catalyst Heteroatom doping CO_(2)reduction reaction DFT calculation

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Modeling Axial Compressor Systems Using Deep Learning Methods

Modeling Axial Compressor Systems Using Deep Learning Method...

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2023 Annual Intermountain engineering, Technology and Computing, IETC 2023

作者： Wilson, Kellie Schoen, Marco P. Idaho State University Measurement and Control Engineering Research Center Department of Mechanical Engineering Pocatello United States

ISBN: (纸本)9798350335903

Studying the characteristics of complex nonlinear systems and designing control strategies necessitates the development of computationally efficient methods. In particular, compressor systems will benefit from accurate models that capture the nonlinear dynamics. In this paper, an overview of neural networks is given with a focus on Long-Short Term Memory (LSTM) networks for dynamic systems. A simple test system is presented for verifying the LSTM approach for single input single output (SISO) systems. An axial compressor system is used to simulate its nonlinear dynamics using the Toolbox for the Modeling and Analysis of Thermodynamic Systems (T-MATS). The proposed LSTM approach is demonstrated for the multiple input multiple output (MIMO) axial compressor model. The proposed approach indicates that LSTM based modeling for highly nonlinear MIMO systems can yield accurate model characterizations. © 2023 IEEE.

关键词： Long short-term memory

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Numerical Method for Complete Solution of the Optimal control Problem 9

Numerical Method for Complete Solution of the Optimal Contro...

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9th International Conference on control, Decision and Information Technologies, CoDIT 2023

作者： Diveev, Askhat Federal Research Center 'Computer Science and Control' The Russian Academy of Sciences Department of Robotics Control Vavilova str. 44 Moscow119333 Russia

ISBN: (纸本)9798350311402

The work is devoted to the numerical complete solution of the optimal control problem. The complete solution means the solution of the optimal control problem together with the solution of the control synthesis problem to stabilize the movement of the control object along the found optimal trajectory. To solve this problem, evolutionary computations and symbolic regression are used. First, the optimal control problem by an evolutionary algorithm in the classical formulation is solved, after that the control synthesis problem by a method of symbolic regression is solved. The statement of the complete optimal control problem is presented. The computational experiment considers the solution of the complete optimal control problem for a quadcopter. © 2023 IEEE.

关键词： Numerical methods

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Effect of Zr on microstructure and mechanical properties of 304 stainless steel joints brazed by Ag-Cu-Sn-In filler metal

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Journal of Iron and Steel research International 2024年第10期31卷 2448-2462页

作者： Ling-ling Huang Jian Qin Jun-lan Huang Hua Yu Chao Jiang Lu-yang Song Zhuo-li Yu Zhi-qian Liao Yan-zhao Cai Li Ma Shi-zhong Wei School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471000HenanChina National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang471000HenanChina State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina Luoyang Ship Material Research Institute Luoyang471039HenanChina Avic Jonhon Optronic Technology Co. Ltd.Luoyang471039HenanChina

The effect of Zr on the microstructure and mechanical properties of 304 stainless steel joints brazed with Ag-Cu fillers was *** incorporation of Zr had little effect on the solid-liquid phase line of the fillers,and the melting temperature range of the fillers was narrowed,which enhanced their fluidity and *** presence of Zr in the form of heterogeneous particles augmented the nucleation rate during solidification,transforming the intermittently distributed gray-black coarse dendrites into cellular *** structural transformation led to fragmentation and refinement of the *** dissolution of Zr into Ag and Cu promoted the transformation of low-angle grain boundaries to high-angle grain boundaries(HAGBs),hindering crack *** element in the brazing seam led to grain refinement and increased density of grain *** grain refinement could disperse the stress,and HAGBs could resist the dislocation movement,improving the joint *** results display that when Zr content was 0.75 wt.%,the maximum strength was 221.1 *** fracture occurred primarily at the brazing seam,exhibiting a ductile fracture.

关键词： Active element Ag-Cu filler Stainless steel Brazing Mechanical property

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Synergically regulated silver species and surface oxygen on manganese oxide for promoted activity of formaldehyde oxidation

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Journal of Environmental sciences 2024年第4期138卷 709-718页

作者： Shuo Hu Jianghao Zhang Xueyan Chen Xiaoxiao Qin Jinshui Yao Changbin Zhang School of Materials Science&Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Formaldehyde(HCHO)is a common indoor pollutant that is detrimental to human *** efficient removal has become an urgent demand to reduce the public health *** this work,Ag-MnO_(x)-based catalysts were prepared and activated under different atmosphere(i.e.,air,hydrogen(H_(2))and carbon monoxide(CO))for efficient oxidation of *** catalyst activated with CO(Ag/Mn-CO)displayed the highest activity among the tested samples with 90% conversion at 100℃ under a gas space velocity of 75,000 mL/(g_(cat)·hr).Complementary characterizations demonstrate that CO reduction treatment resulted in synergically regulated content of surface oxygen on support to adsorb/activate HCHO and size of Ag particle to dissociate oxygen to oxidize the adsorbed *** contrast,other catalysts lack for either abundant surface oxygen species or metallic silver with the appropriate particle size,so that the integrate activity is limited by one specific reaction *** study contributes to elucidating the mechanisms regulating the oxidation activity of Ag-based catalysts.

关键词： HCHO oxidation Ag-MnO_(x)-based catalyst Activation condition Synergic regulation Surface oxygen Oxidized Ag

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Force Compensation control for Electro-Hydraulic Servo System with Pump-Valve Compound Drive via QFT-DTOC

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Chinese Journal of Mechanical engineering 2024年第2期37卷 228-246页

作者： Kaixian Ba Yuan Wang Xiaolong He Chunyu Wang Bin Yu Yaliang Liu Xiangdong Kong Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Qinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Local Joint of Advanced Manufacturing Technology and Equipment Yanshan UniversityQinhuangdao 066004China

Each joint of a hydraulic-driven legged robot adopts a highly integrated hydraulic drive unit(HDU),which features a high power-weight ***,most HDUs are throttling-valve-controlled cylinder systems,which exhibit high energy *** contrast,pump control systems offer a high ***,their response ability is *** fully utilize the advantages of pump and valve control systems,in this study,a new type of pump-valve compound drive system(PCDS)is designed,which can not only effectively reduce the energy loss,but can also ensure the response speed and response accuracy of the HDUs in robot joints to satisfy the performance requirements of ***,considering the force control requirements of energy conservation,high precision,and fast response of the robot joint HDU,a nonlinear mathematical model of the PCDS force control system is first *** addition,pressure-flow nonlinearity,friction nonlinearity,load complexity and variability,and other factors affecting the system are considered,and a novel force control method based on quantitative feedback theory(QFT)and a disturbance torque observer(DTO)is designed,which is denoted as QFT-DTOC *** method improves the control accuracy and robustness of the force control system,reduces the effect of the disturbance torque on the control performance of the servo motor,and improves the overall force control performance of the ***,experimental verification is performed using the PCDS performance test *** experimental results and quantitative data show that the QFT-DTOC proposed herein can significantly improve the force control performance of the *** relevant force control method can be used as a bottom-control method for the hydraulic servo system to provide a foundation for implementing the top-level trajectory planning of the robot.

关键词： Legged robot Pump-valve compound drive system(PCDS) Force compensation control Quantitative feedback theory(QFT) Disturbance torque observer(DTO)

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A synchronous spatiotemporal graph neural network for short-term traffic flow prediction

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Soft Computing 2025年第6期29卷 2983-2997页

作者： Zhang, Zhao Jiao, Xiaohong Engineering Research Center of the Ministry of Education for Intelligent Control System and Intelligent Equipment Yanshan University Qinhuangdao066004 China School of Electrical Engineering Yanshan University Qinhuangdao066004 China

Traffic flow prediction is a vital part of an intelligent traffic management system. The critical challenge of the traffic flow prediction task is to fully use observable historical information to extract the hidden spatiotemporal dependence. For this reason, a synchronous spatiotemporal grammar graph attention network is proposed based on multi-dimensional edge information (MDEI-SSTGGAT) to achieve short-term traffic flow prediction tasks. In the designed model, the spatial nodes are first clustered. Then, a local spatiotemporal graph is established for each category for extracting synchronous spatiotemporal features. In the feature extraction module, the graph attention network with multi-dimensional edge information captures the spatiotemporal features dynamically, and the grammar graph structure fuses the hidden features of three observable traffic parameters. The model fully uses observable traffic parameter features to improve the prediction accuracy while keeping the computation time short. Simulation results on real data sets show that the prediction performance of this model is better than the existing prediction methods. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Traffic control

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Synergy of sodium doping and nitrogen defects in carbon nitride for promoted photocatalytic synthesis of hydrogen peroxide

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Chinese Chemical Letters 2024年第8期35卷 324-329页

作者： Fabrice Nelly Habarugira Ducheng Yao Wei Miao Chengcheng Chu Zhong Chen Shun Mao College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Baowu Water Technology Co. Ltd.Research InstituteShanghai 201999China

Photocatalytic synthesis of hydrogen peroxide has gradually become a promising method for in-situ pro-duction of hydrogen peroxide,which relies on sustainable solar ***,the commonly used photocatalyst,i.e.,carbon nitride(CN),still suffers from the drawbacks of narrow light absorption range and fast charge ***,we report a facile method to introduce nitrogen defects into carbon nitride together with sodium *** adjusting the ratio of sodium dicyandiamide,the band gap of carbon nitride can be controlled,while the carrier separation and transfer ability of carbon nitride is *** modified CN with sodium doping and nitrogen defect(SD-CN)demonstrates outstanding H_(2)O_(2)pro-duction performance(H_(2)O_(2)yield rate of 297.2μmol L^(−1)h^(−1))under visible light irradiation,which is approximately 9.8 times higher than that of pristine *** work deepens the understanding of the coordinated effect of structural defect and element doping of carbon nitride on the photocatalytic H_(2)O_(2)production performance,and provides new insight into the design of photocatalytic system for efficient production of H_(2)O_(2).

关键词： Photocatalysis H_(2)O_(2)evolution Sodium doping Nitrogen defect Metal-free catalyst

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A Line Complex-Based Evolutionary Algorithm for Many-Objective Optimization

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1150-1167页

作者： Liang Zhang Qi Kang Qi Deng Luyuan Xu Qidi Wu the Department of Control Science and Engineering Tongji UniversityShanghai 201804 the Jiangsu Province Support Software Engineering R&D Center for Modern Information Technology Application in Enterprise Suzhou 215104China the Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

In solving many-objective optimization problems(MaO Ps),existing nondominated sorting-based multi-objective evolutionary algorithms suffer from the fast loss of selection *** candidate solutions become nondominated during the evolutionary process,thus leading to the failure of producing offspring toward Pareto-optimal front with *** we find a more effective way to select nondominated solutions and resolve this issue?To answer this critical question,this work proposes to evolve solutions through line complex rather than solution points in Euclidean ***,Plücker coordinates are used to project solution points to line complex composed of position vectors and momentum *** position vectors of the solution points,momentum vectors are used to extend the comparability of nondominated solutions and enhance selection ***,a new distance function designed for high-dimensional space is proposed to replace Euclidean distance as a more effective distancebased *** on them,a novel many-objective evolutionary algorithm(MaOEA)is proposed by integrating a line complex-based environmental selection strategy into the NSGAⅢ*** proposed algorithm is compared with the state of the art on widely used benchmark problems with up to 15 *** results demonstrate its superior competitiveness in solving MaOPs.

关键词： Environmental selection line complex many-objective optimization problems(MaOPs) Plücker coordinate

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