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Structural equation modelling of household long-distance flexible travel behavior

International Journal of Sustainable Development and Planning 2020年第4期15卷 461-467页

作者： Zhang, Jianjun Wang, Feng Shao, Chunfu Mi, Xueyu MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology Beijing Jiaotong University Beijing100044 China Urban Space and Transportation Research Center Jiangsu Zhongshe Group Co. Ltd. Wuxi214000 China Intelligent Transport Laboratory Henan Police College Zhengzhou450046 China North China University of Science and Technology Tangshan063000 China

In recent years, more and more households plan to tourist destinations or visit relatives on holidays. Facing the surging demand for household travel, this paper aims to explore the generation mechanism of household long-distance flexible travel on holidays. Firstly, a questionnaire survey on long-distance flexible travel behavior was conducted among middle-income households in first- and second-tier cities. Then, multiple endogenous and exogenous variables were extracted from the survey data. On this basis, a structural equation model (SEM) was established to analyze the influence of individual attributes, economic attributes, and household attributes over the travel attributes and travel intensity of household long-distance flexible travel. The results show that economic attributes had the greatest impact on travel intensity, among all exogenous variables. This means household income promotes the travel intensity, especially travel duration. Besides, household attributes negatively affect travel intensity. In other words, with the growing number of elderlies, children, and employed in the household, the number of travelers in household travel will increase, while the intensity of household travel will decline;the household will prefer to travel by car. The research results provide theoretical supports to the research of household flexible travel behavior, and enable tourist cities to effectively manage and optimize holiday traffic. © 2020 WITPress. All rights reserved.

关键词： Surveys

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A Hybrid Ant Colony Optimization and Tabu Search Algorithm for Routing Optimization in LEO Satellite Networks

A Hybrid Ant Colony Optimization and Tabu Search Algorithm f...

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International Conference on Optical Communications and Networks (ICOCN)

作者： Yifan Xu Yuanfeng Li Qi Zhang Meng Sun Weiying Feng Xiaohu Li Yi Zhao Furong Chai Feng Tian Fu Wang Qinghua Tian Leijing Yang Yongjun Wang School of Electronic Engineering Beijing University of Posts and Telecommunications (BUPT) Beijing China Beijing Key Laboratory of Space-ground Interconnection and Convergence BUPT Beijing China Science and Technology on Information Systems Engineering Laboratory National University of Defense Technology Changsha China School of Materials Science and Engineering Beihang University Beijing China Beijing Institute of Control and Electronic Technology Beijing China

To optimize routing costs and communication delays in LEO satellite networks, a hybrid ACO and tabu search algorithm is proposed. Simulation results shows compared to the original ACO algorithm, it reduced routing cos... 详细信息

ISBN: (数字)9798350367652

ISBN: (纸本)9798350367669

关键词： Ant colony optimization Satellites Costs Simulation Low earth orbit satellites Routing Optical fiber communication

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An Integral Sliding-Mode Parallel control Approach for General Nonlinear Systems via Piecewise Affine Linear Models

arXiv

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arXiv 2021年

作者： Zhang, Chunyang Gao, Qing Deng, Yue Qiu, Jianbin School of Automation Science and Electrical Engineering Beihang University Beijing China Zhongguancun Laboratory Beijing China School of Astraunotics Beihang University Beijing China State Key Laboratory of Robotics and Systems Harbin Institute of Technology Harbin China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin China

The fundamental problem of stabilizing a general non-affine continuous-time nonlinear system is investigated via piecewise affine linear models (PALMs) in this paper. A novel integral sliding-mode parallel control (ISMPC) approach is developed, where an uncertain piecewise affine system (PWA) is constructed to model a non-affine continuous-time nonlinear system equivalently on a compact region containing the origin. A piecewise sliding-mode parallel controller is designed to globally stabilize the PALM and, consequently, to semi-globally stabilize the original nonlinear system. The proposed scheme enjoys three favorable features: i) some restrictions on the system input channel are eliminated, thus the developed method is more relaxed compared with the published approaches;ii) it is convenient to be used to deal with both matched and unmatched uncertainties of the system;and (iii) the proposed piecewise parallel controller generates smooth control signals even around the boundaries between different subspaces, which makes the developed control strategy more implementable and reliable. Moreover, we provide discussions about the universality analysis of the developed control strategy for two kinds of typical nonlinear systems. Simulation results from two numerical examples further demonstrate the performance of the developed control approach. Copyright © 2021, The Authors. All rights reserved.

关键词： Nonlinear systems

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Data-driven diagnosing for unanticipated fault by a general process model

Data-driven diagnosing for unanticipated fault by a general ...

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Chinese Automation Congress (CAC)

作者： Jiongqi Wang Zhangming He Dayi Wang Haiyin Zhou Department of Mathematics and Systern Science National University of Defense Technology Changsha Hunan PRC Beijing Institute of Control Engineering China Academy of Space Technology Beijing PRC Department of Mathematics and System Science National University of Defense Technology Changsha Hunan PRC State Key Laboratory of Astronautics Dynamics Xi'an Shanxi PRC

The improvement of unanticipated fault detection and diagnosis (UFDD) capability is a difficult point, and is also a tendency for research and application. In this paper, a general process model (GPM) for unanticipated fault diagnosis is established. And combined with the characteristics of monitoring data, the corresponding diagnosis methods are researched. The model and the methods are used for online unanticipated fault detection, isolation and recognition. The GPM for the unanticipated fault diagnosis is designed, by adopting a three-layer progressive structure, which is comprised of an inherent detection layer (IDL), an unanticipated isolation layer (UIL) and an unanticipated recognition layer (URL). Several key problems in the GPM are analyzed, including the establishment and evaluation of detection statistics, the extraction of fault feature direction, and the design of fault isolation criterion and the calculation of contribution factor. The proposed model and methods are driven by pure data and they can detect and diagnose the unanticipated fault. The proposed approach is evaluated by using an example of a satellite's attitude control system, and excellent results have been obtained.

关键词： Fault detection Monitoring Mathematical model Fault diagnosis Data models Testing Attitude control

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A Study on The Modified Proportional Guidance of LOS Angle Acceleration

A Study on The Modified Proportional Guidance of LOS Angle A...

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International Conference on Unmanned Systems and Artificial Intelligence

作者： Xingan Li Cheng Xu Di Zhang Wenxing Fu Meiyun Zheng Xiaofei Chang School of Astronautics Northwestern Polytechnical University Xi'an China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China Shanghai Academy of Spaceflight Technology Shanghai China Unmanned System Research Institute Northwestern Polytechnical University Xi'an China School of Marine Science and Technology Northwestern Polytechnical University Xi'an China

ISBN: (数字)9781728158594

ISBN: (纸本)9781728158600

Because of the increasing mobility of air targets and the trend of heavy using of UAV in the future, the paper analyzes the parameters and ballistic characteristics of the proportional guidance method based on the revised idea of proportional guidance. The method has certain defects in the face of high maneuvering targets, so we have derived a kind of modified proportional guidance law, and designed a new modified proportional guidance law which can effectively overcome the target maneuvering interference. The digital simulation results show that the modified guidance law can effectively overcome the interference factors such as target maneuvering, and it is easy to implement in engineering.

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A Weighted PSO Based Randomized Step Frequency Radar with High Resolution for Compressed Sensing

A Weighted PSO Based Randomized Step Frequency Radar with Hi...

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第27届中国控制与决策会议

作者： Qian Chen Xiongjun Wu Junhao Liu School of Information and Electronics Beijing Institute of Technology Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China The 802 Institute of Shanghai Academy of Space Flight Technology The Eighth Academy of China Aerospace Science and Technology Corporation

ISBN: (纸本)9781479970186

In this paper,a novel randomized step frequency radar with weighted PSO is proposed to recover the range and velocity joint estimating by exploiting sparseness of the targets and invoking compressed sensing(CS) *** this algorithm,we abandons the exhaustive list method in the Orthogonal Matching Pursuit(OMP) scheme,which is easy to cause performance degradation in the radar ***,a weighted PSO dynamic optimal method is adopted,where the convergence speed is increased due to the weighted factor introduced in the Particle Swarm Optimization(PSO).The primary advantage of this method lies in being less sensitive to the initial value of target parameters in the case of online optimization ***,this method overcomes the limitation that the initial parameters must be selected close to the true value of the target,which is not constant in many *** is not necessary to know exactly the target parameters when using our approach,instead,coarse coding bounds of target parameters are enough for the algorithm,which can be done once and for all off-line,and it is only necessary to specify the initial scopes of the velocity and the range of the *** results demonstrate that the proposed weighted PSO approach provides a faster convergence speed and robustness against unpredictable perturbations for range and velocity joint estimating in randomized step frequency radar.

关键词： Weighted PSO Randomized Step Frequency Compressed Sensing

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Traffic-Aware Two-Stage Queueing Communication Networks: Queue Analysis and Energy Saving

Traffic-Aware Two-Stage Queueing Communication Networks: Que...

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作者： Qi, Nan Miridakis, Nikolaos I. Xiao, Ming Tsiftsis, Theodoros A. Yao, Rugui Jin, Shi Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Institute of Physical Internet School of Intelligent Systems Science & Engineering Jinan University Zhuhai Campus Zhuhai519070 China Department of Informatics and Computer Engineering University of West Attica Aegaleo12243 Greece School of Electrical Engineering of KTH Royal Institute of Technology Stockholm11428 Sweden School of Electronics and Information Northwestern Polytechnical University Xi'an710072 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China

To boost energy saving for the general delay-tolerant IoT networks, a two-stage, and single-relay queueing communication scheme is investigated. Concretely, a traffic-aware $N$-threshold and gated-service policy are applied at the relay. As two fundamental and significant performance metrics, the mean waiting time and long-term expected power consumption are explicitly derived and related with the queueing and service parameters, such as packet arrival rate, service threshold and channel statistics. Besides, we take into account the electrical circuit energy consumptions when the relay server and access point (AP) are in different modes and energy costs for mode transitions, whereby the power consumption model is more practical. The expected power minimization problem under the mean waiting time constraint is formulated. Tight closed-form bounds are adopted to obtain tractable analytical formulae with less computational complexity. The optimal energy-saving service threshold that can flexibly adjust to packet arrival rate is determined. In addition, numerical results reveal that: 1) sacrificing the mean waiting time not necessarily facilitates power savings;2) a higher arrival rate leads to a greater optimal service threshold;and 3) our policy performs better than the current state-of-the-art. © 2020 IEEE.

关键词： Energy conservation

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Robust Output Synchronization of Discrete-Time Linear-Time-Invariant Multi-Agent Systems Using Phase Tool

Robust Output Synchronization of Discrete-Time Linear-Time-I...

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European control Conference (ECC)

作者： Xin Mao Dan Wang Wei Chen Li Qiu School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Division of Decision and Control Systems KTH Royal Institute of Technology Stockholm Sweden Department of Mechanics and Engineering Science State Key Laboratory for Turbulence and Complex Systems Peking University Beijing China Southern University of Science and Technology Shenzhen China Hong Kong University of Science and Technology Hong Kong S.A.R. China

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

In this paper, the output synchronization in large-scale discrete-time networks is examined by utilizing the novel phase tool, where the agent dynamics are allowed to be significantly heterogeneous. The synchronization synthesis problem is formulated and thoroughly investigated, with the goal of characterizing the allowable heterogeneity among the agents to ensure synchronization under a uniform controller. The solvability condition is provided in terms of the phases of the residue matrices of the agents at the persistent modes. When the condition is satisfied, a design procedure is given, producing a low-gain synchronizing controller. Numerical examples are given to illustrate the results.

关键词： Sufficient conditions Europe Heterogeneous networks Synchronization Multi-agent systems

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Robust control of flat systems using sliding mode approach

Robust control of flat systems using sliding mode approach

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American control Conference

作者： Liming Chen Yingmin Jia Junping Du Seventh Research Division and the Center for Information and Control School of Automation Science and Electrical Engineering Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications 100876 China

ISBN: (纸本)9781467386838

In this paper, sliding mode approach is used to deal with the robust control of flat systems. Model of flat systems with disturbance and parametric uncertainty is established. A scheme to design sliding mode control laws is proposed to guarantee the robustness of the systems. For the case that the bounds of disturbance and parametric uncertainty are unknown, adaptive controllers are designed to estimate the bounds or unknown parameters. The stability is proved with Lyapunov method. Simulations of a magnetic levitation system are given to illustrate the effectiveness of the approach.

关键词： Sliding mode control Uncertainty Tracking Lyapunov methods Robustness Feedforward neural networks Adaptive control feedforward neural nets Variable structure systems Lyapunov methods Robust control adaptive control Magnetic levitation systems tracking Uncertainty Robustness Sliding mode FLAT adaptive controller disturbance

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Coordinated Optimization Method of Dual Head Gasoline Blending Under Strict Constraint Conditions

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Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) 2019年第2期35卷 337-347页

作者： He, Renchu Chen, Haiquan Zhang, Weidong Zhu, Wenqi Key Laboratory of Advanced Control and Optimization Technology for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai200237 China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai University Shanghai200072 China Information and Measurement Center Jinling Company SINOPEC Nanjing210033 China Storage and Transportation Department Zhenhai Refining&Chemical Company SINOPEC Ningbo315207 China

For the upcoming China Ⅵ gasoline standard with much more strictly controlled properties, and high requirements for blending efficiency, a blending process and coordinated optimization algorithm for blending multiple brands of gasoline at the same time were developed. Octane number model, vapor pressure model, density model, distillation range model and content attribute model were established. The calculation process of octane number model and distillation range model have been improved, and 12 quality indicators of gasoline can be precisely monitored during the blending process. Considering the actual accumulative blending process, the properties of gasoline in the tank during the blending process should be converted into instantaneous properties zone at the blending head. The optimized properties of the blending head are used to compensate the properties deviation of the amount of blending and the tank bottom oil. Meanwhile, a reasonable and efficient coordination optimization algorithm is used to coordinate the upper limit of the common component oil, which solves the problem of scramble for the common component oil flow in the double blending head in the blending process. The simulation results show that the design method can be applied to the gasoline blending of double head in the field, and can also provide technical support for the upgrading of gasoline blending process under the China Ⅵ gasoline standard. © 2019, Editorial Office of Acta Petrolei Sinica(Petroleum Processing Section). All right reserved.

关键词： Gasoline

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