检索结果-内蒙古大学图书馆

IEEE International Conference on Unmanned systems (ICUS)

作者： Fang Wang Zhao Lu Qinghua Liu Yutong Zhu Jiandong Zhang Guoqing Shi Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing Electro-Mechanical Engineering Institute Beijing China School of Electronics and Information Northwestern Polytechnical University Xi’an China

ISBN: (数字)9781728180250

ISBN: (纸本)9781728180267

Aiming at the problem of sudden threat avoidance in the process of aircraft formation cooperative penetration, formation collision avoidance strategies based on improved artificial potential field method are proposed. The effective range of the artificial repulsion potential field and the collision avoidance airspace of the sudden threat source are established. To improve the artificial potential field, the formation velocity correction coefficient and the threat source entry angle correction coefficient are introduced. In addition, the improved artificial repulsion potential energy function is defined. Based on the improved artificial potential filed in three-dimensional space, the formation collision avoidance controller on the horizontal and altitude channel are proposed respectively. Flight control commands such as rudder angle, aileron rudder angle, and elevator yaw angle are given. The simulation results confirm the security and efficiency of the formation collision avoidance strategy.

关键词： Collision avoidance Intelligent agents control systems Radio frequency Information systems Complex systems Aircraft

来源：评论

学校读者我要写书评

暂无评论

Fault tolerant control for high-order multi-agent systems with switching interaction topologies 11

Fault tolerant control for high-order multi-agent systems wi...

引用

11th CAA Symposium on Fault Detection, Supervision, and Safety for Technical Processes, SAFEPROCESS 2019

作者： Wang, Qing Liu, Yu'Ang Zhong, Kewei Dong, Chaoyang Hou, Yanze School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Shanghai Aerospace Control Technology Institute Shanghai201100 China School of Aeronautic Science and Engineering Beihang University Beijing100191 China Institute of Manned Space System Engineer CAST Beijing100094 China

ISBN: (纸本)9781728106816

Fault tolerant control (FTC) for high-order multi-agent systems (MAS) with switching interaction topologies are investigated via active disturbance rejection control (ADRC) approach. The influence of the dynamics uncertainties and the actuator fault functions are estimated by the designed extended state observer (ESO), and compensated in the designed control strategy real time. The closed-loop system is proved to be stable despite the actuator fault. The algorithm for the chosen of the parameters is also given. The simulation results demonstrate the effectiveness of the designed controller, the MAS can achieve the predefined switching time-varying formation. © 2019 IEEE.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Optimal linear-quadratic guidance law considering autopilot first-order lag with terminal acceleration constraint

Optimal linear-quadratic guidance law considering autopilot ...

引用

Asia-Pacific International Symposium on Aerospace Technology, APISAT 2018

作者： Zheng, Duo Xu, Xinghua Yan, Ruyi Lin, Defu Beijing Electro-Mechanical Engineering Institute Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China Beijing Institute of Automatic Control Equipment Beijing100074 China Unit 95806 PLA Air Force Beijing100070 China School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9789811333040

In this paper, a new optimal linear-quadratic guidance law with terminal acceleration constraints is proposed for intercepting maneuvering target. Because the angle of attack is approximately proportional to the normal acceleration for aerodynamic control missile, not only miss distance, but also terminal acceleration is required to converge to zero for increasing effectiveness of the warhead for destroying armored target in the proposed guidance law. The gain characteristic of proposed guidance law is studied by comparing with traditional optimal guidance law with considering autopilot dynamics lags. Numerical simulations are performed to examine performance of the proposed optimal guidance law, and its robustness with respect to the time constant of autopilot dynamic lags is also studied by considering time constant typical errors. © Springer Nature Singapore Pte Ltd. 2019.

关键词： Angle of attack

来源：评论

学校读者我要写书评

暂无评论

An Efficient Evolutionary Algorithm for High-Speed Train Rescheduling Under a Partial Station Blockage

SSRN

引用

SSRN 2023年

作者： Wang, Rongsheng Zhang, Qi Dai, Xuewu Yuan, Zhiming Zhang, Tao Ding, Shuxin Jin, Yaochu China Academy of Railway Sciences Corporation Limited Beijing100081 China Signal and Communication Research Institute China Academy of Railway Sciences Corporation Limited Beijing100081 China Train Operation Control Laboratory for High-Speed Railway National Engineering Research Center of System Technology for High-Speed Railway and Urban Rail Transit Beijing100081 China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang110819 China Faculty of Technology Bielefeld University BielefeldD-33615 Germany Department of Computer Science University of Surrey GuildfordGU2 7XH United Kingdom

This paper investigates the high-speed train rescheduling (HSTR) problem under a partial station blockage and proposes an efficient problem-specific strengthen elitist genetic algorithm (PS-SEGA) for HSTR. An HSTR model that is subject to train operation constraints is established to minimize the total train delay. The PS-SEGA framework consists of the following main steps. Firstly, a permutation-based encoding method is developed to define an efficient search space based on a train departure sequence. A decoding method is employed to output the rescheduled timetable and objective value based on the departure sequence. Moreover, a hybrid initialization method involving an efficient heuristic strategy (EHS) is put forward to accelerate the convergence speed of Evolutionary algorithms (EAs). Using problem-specific knowledge, EHS generates an efficient and feasible solution for the initial population. Finally, a restart strategy is presented to maintain genetic diversity. Compared with other advanced EAs and their improved variants also using the PS-SEGA framework, experimental results demonstrate the effectiveness of the proposed PS-SEGA for addressing HSTR scenarios under the partial station blockage. As for the scenarios that CPLEX can not obtain optimal solutions within 10 minutes, PS-SEGA can all provide quasi-optimal solutions in real-time. Furthermore, compared with the other two strategies (i.e., First-Scheduled-First-Served and EHS), PS-SEGA can find the best departure sequence that can output the timetable with a quasi-optimal solution. © 2023, The Authors. All rights reserved.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

A comprehensive review on the need for integrated strategies and process modifications for per- and polyfluoroalkyl substances (PFAS) removal: Current insights and future prospects

引用

Case Studies in Chemical and Environmental engineering 2024年 9卷

作者： Sharma, Neha Kumar, Vinay Sugumar, Vimal Umesh, Mridul Sondhi, Sonica Chakraborty, Pritha Kaur, Komalpreet Thomas, Jithin Kamaraj, Chinnaperumal Maitra, Subhrangsu Sundar Department of Biochemistry Saveetha Medical College and Hospital Saveetha Institute of Medical and Technical Sciences (SIMATS) Thandalam Chennai 602105 India Bioconversion and Tissue Engineering (BITE) Laboratory Department of Community Medicine Saveetha Medical College and Hospital Saveetha Institute of Medical and Technical Sciences (SIMATS) Thandalam Chennai 602105 India Department of Life Sciences CHRIST (Deemed to Be University) Karnataka Bengaluru 560029 India Haryana State Pollution Control Board Haryana Panchkula India School of Allied Healthcare and Sciences Jain (Deemed to Be) University Whitefield Karnataka Bangalore 560066 India Punjab Agricultural University Institute of Agriculture Gurdaspur Punjab 143521 India Department of Biotechnology Mar Athanasius College Kerala India Interdisciplinary Institute of Indian System of Medicine (IIISM) SRM Institute of Science and Technology (SRMIST) Kattankulathur Tamilnadu Chennai 603203 India Metagenomics and Bioprocess Design Laboratory School of Biotechnology Jawaharlal Nehru University New Delhi India

Alarming concern over the persistence and toxicity of per- and polyfluoroalkyl substances (PFAS) in the environment has created an imperative need for designing and redesigning strategies for their detection and remediation. Conventional PFAS removal technologies that uses physical, chemical, or biological methods. Increase in the diversity and quantity of PFAS entering the environment has necessitated the need for developing more advanced and integrated strategies for their removal. Despite of the advances reported in this domain, there exist a huge research gap that need to be mentored to tackle the problems associated with mitigation of combined toxicity of wide variety of PFAS in the environment. The possibility of PFAS to combine with other emerging contaminants poses an additional threat to the existing treatment methods thereby stressing the need for a continuous monitoring and updating the treatment processes. This review work aims at understanding the structure, entry, and fate of different types of PFAS in to the environment. Further an in-depth discussion regarding the different levels of toxicity associated with PFAS is elaborated in the review. The process description of recent PFAS remediation techniques along with their significance, limitations and possibility of integration is discussed in detail. Further a detailed outlook on the advantages and limitations of PFAS removal methods and an insight into the recently developed PFAS removal methods is outlined in this review. © 2024 The Authors

关键词： PFAS degradation PFAS removal PFAS removal strategies PFAS toxicity PFAS transport

来源：评论

学校读者我要写书评

暂无评论

Trajectory Optimization for Long-Range Air-Defense Missile with a Constraint on Capability of Error Correction

Trajectory Optimization for Long-Range Air-Defense Missile w...

引用

第三十八届中国控制会议

作者： Shoukun LV Mingchun CAI ZHOU Di ZHOU Zicai WANG Beijing Institute of Electronic System Engineering Department of Control Science and Engineering Harbin Institute of Technology Center of Control and Simulation Harbin Institute of Technology

A method of designing optimal parabolic trajectory for long range air-defense interceptor missile with a constraint on capability of error correction in its terminal guidance phase is proposed. In this method a constraint condition on the error correction capability in finite terminal guidance phase for the missile with bounded acceleration is presented to replace the traditional constraint on instantaneous normal acceleration. A minimum time problem under the constraint is solved using the nonlinear programming optimal control theory. Simulation results for some typical scenarios of long range interception show that the optimal trajectories satisfy a series of constraints including not only the error correction capability, but also the constraint on and maximum angle of attack, and the constraints on terminal flight path angle and terminal velocity.

关键词： Interceptor Trajectory optimization Constraint Nonlinear programming

来源：评论

学校读者我要写书评

暂无评论

Disturbance Observer-Based Boundary control for an Anti-Stable Stochastic Heat Equation with Unknown Disturbance

arXiv

引用

arXiv 2021年

作者： Wu, Ze-Hao Zhou, Hua-Cheng Deng, Feiqi Guo, Bao-Zhu School of Mathematics and Big Data Foshan University Foshan528000 China The School of Mathematics and Statistics Central South University Changsha410075 China Systems Engineering Institute South China University of Technology Guangzhou510640 China Key Laboratory of System and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China

MSC Codes 35K05, 37L55, 93B52In this paper, a novel control strategy namely disturbance observer-based control is first applied to stabilization and disturbance rejection for an anti-stable stochastic heat equation with Neumann boundary actuation and unknown boundary external disturbance generated by an exogenous system. A disturbance observer-based boundary control is designed based on the backstepping approach and estimation/cancellation strategy, where the unknown disturbance is estimated in real time by a disturbance observer and rejected in the closed-loop, while the in-domain multiplicative noise whose intensity is within a known finite interval is attenuated. It is shown that the resulting closed-loop system is exponentially stable in the sense of both mean square and almost surely. A numerical example is demonstrated to validate the effectiveness of the proposed control approach. Copyright © 2021, The Authors. All rights reserved.

关键词： Disturbance rejection

来源：评论

学校读者我要写书评

暂无评论

A Scale Adaptive Kernel Correlation Filter-Based Tracker with Optimized Update Strategy

A Scale Adaptive Kernel Correlation Filter-Based Tracker wit...

引用

第三十九届中国控制会议

作者： Minghui Shi Yong Heng Liang Han Qingdong Li Zhang Ren School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beihang University Beijing Institute of Electronic System Engineering School of Sino-French Engineer Beihang University Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University

Correlation filter-based trackers have achieved competitive results in the field of visual tracking, but the abilities to deal with the multi-scale and keep the tracking stability still need to be improved. In this article, the complex background tracking problems are studied based on the kernel correlation filter. In order to address the fixed size limitation, we present an improved scheme, which can not only realize scale adaption, but also retain the advantages of the original algorithm. In addition, the adaptive update learning rate of the model is achieved by using the peak sidelobe ratio as an indicator to measure the filter performance. Using the index, we can selectively reduce the model interference to low precision information. Moreover, we design a redetection mechanism that runs automatically when the tracking evaluation indicator is low. Compared with the radical model update methods, those conservative update strategies can effectively decrease the model pollution and ensure the tracking effect. Extensive verifications based on OTB-100 benchmark show that the optimized algorithm improves the accuracy, robustness, and generalization ability of target tracking.

关键词： Target tracking Kernel correlation filter Scale adaption Peak sidelobe ratio Learning rate adaption

来源：评论

学校读者我要写书评

暂无评论

Effect of tin oxide coating on physical properties of silver nanowire transparent conductive electrodes

引用

Applied Physics A: Materials science and Processing 2025年第6期131卷

作者： Nguyen, Thi Hong Nhung Luu, Ba Hoang Anh Pham, Sy Hieu Nguyen, Thi Thu Hien Tran, Quoc Hoan Pham, Anh Tuan Nguyen, Thi Lan Nguyen, Duy Cuong School of Materials Science and Engineering Hanoi University of Science and Technology No. 1 Dai Co Viet Str. Hai Ba Trung Hanoi Viet Nam Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Viet Nam Faculty of Power System Electric Power University 235 Hoang Quoc Viet Str Hanoi Viet Nam Faculty of Control and Automation Electric Power University 235 Hoang Quoc Viet Str Hanoi Viet Nam

Thin SnO2 layers were coated on the surface of silver nanowire transparent conductive electrodes (AgNW TCEs) by atmospheric pressure atomic layer deposition. After coating, the AgNWs have been fully covered on their surface with a layer of SnO2, and they are connected to the surface of the substrate. The sheet resistance sharply decreased from 170.86 Ω/ to 20.09 Ω/, while the transmittance reduced from 93.08 to 71.67%. The Joule-heating temperature of the transparent electrode increased from 117 °C to 251 °C. The best AgNW TCE was observed at 100 cycle SnO2 coating with a sheet resistance of 20.09 Ω/, transmittance of 88.91%, and figure of merit of 155.03. The adhesion of silver nanowires to the substrate significantly increased after coating SnO2. Results indicate that the SnO2 coating on the surface of AgNWs by atomic layer deposition is a highly attractive approach for improving the performance of AgNW TCEs. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Silver nanowires

来源：评论

学校读者我要写书评

暂无评论

High-resolution source apportionment and spatiotemporal drivers of per- and polyfluoroalkyl substances (PFAS) across China’s largest river-estuary continuum: Toward sustainable management of emerging contaminants

引用

Water Research 2025年 284卷

作者： Ya Yang Lai Wei Rui Wang Guohua Zhao Shouye Yang Haifeng Cheng Hualin Wu Qinghui Huang Key Laboratory of Yangtze River Water Environment of the Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai 200092 China School of Chemical Science and Engineering Tongji University Shanghai 200092 China School of Ocean and Earth Science Tongji University Shanghai 200092 China Key Laboratory of Estuarine and Coastal Project Ministry of Transport Shanghai Estuarine and Coastal Science Research Center Shanghai 201201 China International Joint Research Center for Sustainable Urban Water System Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China

This study developed and applied a multivariate framework to identify and prioritize key sources and socioeconomic drivers of per- and polyfluoroalkyl substances (PFAS) pollution along the 600-km long Yangtze River downstream to the Estuary continuum. A total of 180 samples, including water, suspended particulate matter (SPM) and sediment, were systematically collected from different river segments, wastewater effluents and drinking water sources along the river. Perfluorobutanoic acid (PFBA) was the dominant PFAS across all matrices, followed by perfluorohexanoic acid (PFHxA) and perfluorodecanoic acid (PFDA). SPM-water partitioning was primarily influenced by compound-specific carbon chain length and salinity gradients. Source apportionment using self-organizing map, geographically weighted regression, and distance-decay analysis identified a riverside fluorochemical manufacturing facility as a primary point source, along with five secondary fluorine-related sources. Structural equation modeling revealed that industrial development had a stronger direct impact on PFAS contamination (path coefficient = 1.637, p < 0.01) than urbanization (path coefficient = 0.347, p < 0.01). Based on socioeconomic indicators, random forest and support vector machine models were employed to project PFAS concentrations from 2015 to 2035 under a rapid urbanization scenario. The average accumulation rate of Σ 12 PFAS in the sediment was estimated at 168 pg/g·y -1 , with projected stabilization after 2025 likely driven by the implementation of new pollutants control policies. These findings provide a practical basis for source-targeted PFAS management in complex estuarine environments.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：