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2024 IEEE International Conference on systems, Man, and Cybernetics, SMC 2024

作者： Li, Wei Yang, Yanyan Chai, Ming Shi, Jinke Liu, Hongjie Lv, Jidong Su, Haoxiang Beijing Jiaotong University National Engineering Research Center of Rail Transportation Operation and Control System Beijing100044 China Beijing Urban Rail Transit Consulting Co. Ltd. Beijing China Handan Administrative Approval Bureau Hebei China Crsc Research & Design Institute Group Co. Ltd. Beijing China

ISBN: (纸本)9781665410205

Real-time and accurate positioning is the key to ensuring the safe operation of trains. Traditional train positioning technology relies on track-side equipment, and there are problems such as high construction and maintenance costs and difficulties in obtaining the initial train positions. With the rapid development of enabling technologies such as AI and image recognition, visual perception-based train autonomous positioning technology has attracted widespread attention in recent years. To address the problem of large measurement errors due to camera pose changes in train visual positioning, this article proposes a monocular ranging method based on visual beacon imaging size correction. A kilometer post is used as a visual beacon, and a deep neural network is used to detect the visual beacon and extract its feature points' pixel coordinates. The PnP algorithm is used to estimate the camera pose and correct the visual beacon imaging size through the camera pose angle, the average relative error of ranging is stabilized at 2% 3%, and the ranging effect is improved by about 60%, which effectively reducing the ranging error of the monocular ranging model based on known references. © 2024 IEEE.

关键词： Deep neural networks

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Reflectionless spatial beam benders with arbitrary bending angle by introducing optic-null medium into transformation optics

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Chinese Physics B 2021年第3期30卷 242-247页

作者： Fei Sun Yi-Chao Liu Yi-Biao Yang Hong-Ming Fei Zhi-Hui Chen Sai-Ling He Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China National Engineering Research Center for Optical Instruments Center for Optical and Electromagnetic ResearchZhejiang UniversityHangzhou 310058China

By introducing an optic-null medium into the finite embedded transformation,a reflectionless spatial beam bender is designed,which can steer the output beam by a fixed pre-designed angleβfor an arbitrary incident *** bending angleβof the beam bender is determined by the geometrical angle of the device,which can be changed by simply choosing different geometrical *** various bending angles,the designed spatial beam bender can be realized by the same materials(i.e.,an optic-null medium),which is a homogenous anisotropic *** simulations verify the reflectionless bending effect and rotated imaging ability of the proposed beam bender.A reduction model of the optic-null medium is studied,which can also be used for a reflectionless spatial beam bender with a pre-designed bending angle.

关键词： spatial beam benders optic-null medium transformation optics

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Synergia Evaluation of Multi-type Rail Transit Operation Oriented to the Four-Railway-Network Integration 1

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6th International Conference on Electrical engineering and Information Technologies for Rail Transportation, EITRT 2023

作者： Liu, Gehui Liu, Ling Liu, Jun Li, Qing Zhang, Huiru Beijing National Railway Research & Design Institute of Signal & Communication Group Co. Ltd. Beijing100070 China Beijing Engineering Technology Research Center of Operation Control System for High Speed Railways Beijing100070 China Beijing Mass Transit Railway Operation Co. Ltd. Beijing100044 China

ISBN: (数字)9789819993116

ISBN: (纸本)9789819993109

The four-railway-network integration is the policy guidance of multi-type rail transit for intensive resource usage, transportation efficiency enhancement, and regional society and economy development. The synergia improvement concerning multi-type rail transit is an important rising of the service level of regional rail transit system and guidance for urbanization progress. Based on the summary of the current status and policy directions of the synergetic development, the concept and key indicators evaluating the degree of synergia are introduced. Four main synergetic patterns are distinguished referring to the typical cases, including independent operation, passenger service integration, cross-line operation, and regional coordination. Detailed patterns and evaluation indicators with respect to the passenger service integration and cross-line operation are further put forward respectively according to the improvement of passenger service and the difficulty of connection implementation. The proposed theoretical methods and indicators provide the firm support and active reference for the synergetic development of multi-type rail transit systems. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Rails

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Deciphering decadal urban ozone trends from historical records since 1980

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national Science Review 2024年第11期11卷 117-129页

作者： Haolin Wang Xiao Lu Paul I.Palmer Lin Zhang Keding Lu Ke Li Tatsuya Nagashima Ja-Ho Koo Hiroshi Tanimoto Haichao Wang Meng Gao Cheng He Kai Wu Shaojia Fan Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen University and Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Geo Sciences University of Edinburgh National Centre for Earth Observation University of Edinburgh Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University State Key Joint Laboratory of Environmental Simulation and Pollution Control The State Environmental Protection Key Laboratory of Atmospheric Ozone Pollution ControlCollege of Environmental Sciences and Engineering Peking University Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science &Technology National Institute for Environmental Studies Department of Atmospheric Sciences Yonsei University Department of Geography Hong Kong Baptist University Department of Civil and Environmental Engineering University of California

Ozone pollution is a major environmental threat to human health. Timely assessment of ozone trends is crucial for informing environmental policy. Here we show that for the most recent decade（2013–2022） in the northern hemisphere, warm-season（April–September） mean daily 8-h average maximum ozone increases much faster in urban regions with top ozone levels(mainly in the North China Plain, 1.2 ± 1.3 ppbv year-1) than in other, low-ozone regions(0.2 ± 0.9 ppbv year-1). These trends widen the ozone differences across urban regions, and increase extreme pollution levels and health threats from a global perspective. Comparison of historical trends in different urban regions reveals that ozone increases in China during 2013–2022 differ in magnitude and mechanisms to historical periods in other regions since *** reflects a unique chemical environment characterized by exceptionally high nitrogen oxides and aerosol concentrations, where reducing ozone precursor emissions leads to substantial ozone *** increase in China has slowed down in 2018–2022 compared to 2013–2017, driven by ongoing emission reductions, but with ozone-favorable weather conditions. Historical ozone evolution in Japan and South Korea indicates that ozone increases should be suppressed with continuous emission *** temperature and associated wildfires have also reversed ozone decreases in the USA and Europe,with anthropogenic ozone control slowing down in recent decades.

关键词： air quality surface ozone trends

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Integrated Capacity Analysis Model and Optimization Based on Conflict Resolution for High-Speed Railway

Integrated Capacity Analysis Model and Optimization Based on...

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2022 Chinese Automation Congress, CAC 2022

作者： Wei, Yuan Ma, Lin Yin, Jiateng Beijing Jiaotong University National Engineering Research Center of Rail Transportation Operation and Control System Beijing100044 China Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing100044 China

ISBN: (纸本)9781665465335

With the increased demand of passengers, the capacity analysis of high-speed railways has attracted much attention for serving more passengers with limited line resources. Existing methods mainly focused on the capacity analysis of rail sections or stations, separately. Our study first addressed the integrated capacity analysis of high-speed railways. We established an integrated capacity analysis model by combining the signal control of track sections, the overtaking of trains and the capacity of rail stations. Then this paper proposed a conflict resolution strategy based on multi-objective optimization. A real-world case study on the Beijing-Shanghai high-speed railway demonstrated that our approach can better model the influencing factors in high-speed railways and can further improve the line capacity compared with existing approaches. © 2022 IEEE.

关键词： Multiobjective optimization

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Machine learning for membrane bioreactor research:principles,methods,applications,and a tutorial

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Frontiers of Environmental Science & engineering 2025年第3期19卷 119-144页

作者： Yizhe Lai Kang Xiao Yifan He Xian Liu Jihua Tan Wenchao Xue Aiqian Zhang Xia Huang Beijing Yanshan Earth Critical Zone National Research Station College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 101408China Key Laboratory of Earth System Numerical Modeling and Application University of Chinese Academy of SciencesBeijing 101408China Environmental Chemistry Faculty College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 101408China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Energy Environmentand Climate ChangeSchool of EnvironmentResourcesand DevelopmentAsian Institute of TechnologyP.O.Box 4Klong LuangPathumthani 12120Thailand State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Membrane fouling poses a significant challenge to the sustainable development of membrane bioreactor(MBR)technologies for wastewater *** accurate prediction of the membrane filtration process is of great importance for identifying and controlling *** learning methods address the limitations of traditional statistical approaches,such as low accuracy,poor generalization ability,and slow convergence,particularly in predicting complex filtration and fouling processes within the realm of big *** article provides an in-depth exposition of machine learning *** study then reviews advances in MBRs that utilize machine learning methods,including artificial neural networks(ANN),support vector machines(SVM),decision trees,and ensemble *** on current literature,this study summarizes and compares the model input and output characteristics(including foulant characteristics,solution environments,filtration conditions,operating conditions,and time factors),as well as the selection of models and optimization *** modeling procedures of SVM,random forest(RF),back propagation neural network(BPNN),long short-term memory(LSTM),and genetic algorithm-back propagation(GA-BP)methods are elucidated through a tutorial *** simulation results demonstrated that all five methods yielded accurate predictions with R2>***,the existing challenges in the implementation of machine learning models in MBRs were *** is notable that integration of deep learning,automated machine learning(AutoML)and explainable artificial intelligence(XAI)may facilitate the deployment of models in practical engineering *** insights presented here are expected to facilitate the establishment of an intelligent control framework for MBR processes in future endeavors.

关键词： Membrane bioreactor Machine learning Pollutant removal Membrane fouling Model prediction

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A Space-Time Interval Based Safety Protection Model for Virtual Coupling Heavy-Haul Trains 27

A Space-Time Interval Based Safety Protection Model for Virt...

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27th IEEE International Conference on Intelligent Transportation systems, ITSC 2024

作者： Zhang, Xinyi Chai, Ming Wang, Qi Su, Haoxiang Wang, Hai-Feng Lv, Jidong Zhang, Yong National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing100044 China Standards and Metrology Research Institute China Academy of Railway Sciences Limited Corporation Beijing100081 China Crsc Research and Design Institute Group Co. Ltd. Beijing China School of Traffic and Transportation Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9798331505929

Heavy-haul railway is one of the most cost-effective ways of transporting bulk goods globally, and enhancing its capacity is critical. The dominant method of capacity enhancement is increasing the load capacity of a single train, carrying risks of accidents. Introducing virtual coupling into heavy-haul railways is expected to solve these problems and significantly increase capacity. However, the absolute braking distance based safety protection model cannot meet the demand for distance between adjacent virtually coupled heavy-haul trains. To overcome this shortage, we propose a space-time interval based safety protection model for virtual coupling heavy-haul trains. Constraints are added to the model to ensure the two trains will not collide during the entire braking process. Aiming at the feature of long braking delay caused by the extended length of heavy-haul trains, we develop a braking wave propagation model to establish a more accurate safety braking model and shorten the safe distance between adjacent virtually coupled trains. Different safety braking models are used for the preceding and following trains to improve computational efficiency. The experimental results show that the safe distance of this model is shortened by 41.8% compared with the ABD based safety protection model at 80 km/h. © 2024 IEEE.

关键词： Freight cars

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Performance simulation analysis of new train control system safety communication protocol based on Matlab/SimEvents 5

Performance simulation analysis of new train control system ...

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2022 5th International Conference on Power Electronics and control engineering, ICPECE 2022

作者： Jing, Zhiqiang Li, Kaicheng Wei, Guodong Liu, Yu School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China Collaborative Innovation Center of Railway Traffic Safety National Engineering Research Center of Rail Transit Operation Control System Beijing Jiaotong University Beijing100044 China

The vehicle-ground safety communication of the New Train control system adopts a brand-new underlying network and a communication mechanism of safe and reliable transmission. Based on the GPRS packet switching network, the data link layer adopts the PPP protocol, and the TCP protocol is adopted in the transmission layer to provide reliable transmission services. According to the GPRS network service quality index and the retransmission mechanism of the TCP protocol in the transport layer, this paper adopts the Matlab/SimEvents discrete event simulation method and uses the entity as the communication carrier to conduct a hierarchical and modular system-level modeling of New Train control system vehicle-ground communication protocol. It simulates the communication process of the message from the application layer, the security layer to the transport layer, and finally transmitted on the GPRS network channel with random delay and packet loss probability. From the quantitative point of view, this paper analyzes the safety connection establishment time and success rate of the new train control system vehicle-ground wireless communication under different channel conditions, the timeliness of the non-periodic message receiving a reply to complete the specific scene function, and the reliability of the periodic message receiving delay. The analysis results show that the new train control system vehicle-ground wireless communication adopts GPRS network and TCP protocol retransmission mechanism to improve the real-time and reliability of communication. © Published under licence by IOP Publishing Ltd.

关键词： MATLAB

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Hydroxyapatite nanoparticles drive the potency of Toll-like receptor 9 agonist for amplified innate and adaptive immune response

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Nano research 2022年第10期15卷 9286-9297页

作者： Qin Zeng Ruiqi Wang Yuchen Hua Hongfeng Wu Xuening Chen You-cai Xiao Qiang Ao Xiangdong Zhu Xingdong Zhang National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China NMPA Key Laboratory for Quality Research and Control of Tissue Regenerative Biomaterials&Institute of Regulatory Science for Medical Devices&NMPA Research Base of Regulatory Science for Medical Devices Sichuan UniversityChengdu 610064China College of Biomedical Engineering Sichuan UniversityChengdu 610064China Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province Sichuan UniversityChengdu 610041China

The potency of Toll-like receptor 9(TLR9)agonist to drive innate immune response was limited due to immune suppression or tolerance during TLR9 signaling activation in immune *** we addressed this problem by introducing hydroxyapatite nanoparticles(HANPs)to CpG ODN(CpG),a TLR9 *** study revealed that HANPs concentration and durationdependently reprogramed the immune response by enhancing the secretion of immunostimulatory cytokines(tumor necrosis factorα(TNFα)or IL-6)while reducing the production of immunosuppressive cytokine(IL-10)in macrophages in response to ***,the enhanced immune response benefited from increased intracellular Ca2+in macrophage by the addition of ***,we found exposure to HANPs impacted the mitochondrial function of macrophages in support of the synthesis of adenosine triphosphate(ATP),the production of nicotinamide adenine dinucleotide(NAD),and reactive oxygen species(ROS)in the presence or absence of *** vaccinated mice model,only one vaccination with a mixture of CpG,HANPs,and OVA,a model antigen,allowed the development of a long-lasting balanced humoral immunity in mice without any histopathological change in the local injection ***,this study revealed that HANPs could modulate the intracellular calcium level,mitochondrial function,and immune response in immune cells,and suggested a potential combination adjuvant of HANPs and TLR9 agonist for vaccine development.

关键词： hydroxyapatite nanoparticles Toll-like receptor 9 intracellular calcium mitochondrial function adaptive immune response

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Applying system Thinking to Learn from Accident of Modern Automatic control systems

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Chinese Journal of Electronics 2025年第2期23卷 409-414页

作者： Ru Niu Yuan Cao Xiaocheng Ge Tao Tang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China School of Electronics and Information Engineering National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing China Department of Computer Science University of York York UK

Modern societies increasingly rely on automatic control systems. These systems are hardly pure technical systems; instead they are complex socio-technical systems, which consist of technical elements and social components. It is necessary to have a systematic approach to analyze these systems because it is growing evidence that accidents from these systems usually have complex causal factors which form an interconnected network of events, rather than a simple cause-effect chain. We take railway Train control systems (TCS) as an example to demonstrate the importance of the socio-technical approach to analyze the system. The paper presents an investigation of recent high-speed railway accident by applying STAMP - one of the most notable socio-technical system analysis techniques, outlines improvements to the system which could avoid similar accidents in the future. We also provide our valuable feedback for the use of STAMP.

关键词： Sociotechnical systems Analytical models systematics Railway accidents Transportation Medical services Rail transportation systems thinking research and development Accidents

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