检索结果-内蒙古大学图书馆

Spatial-temporal distribution characteristics and traceability analysis of NOx emission from vehicles based on real-time automatic vehicle identification data in Guangzhou, China

Spatial-temporal distribution characteristics and traceabili...

引用

2023 International Conference on Smart Transportation and City engineering, STCE 2023

作者： Yang, Xinru Pian, Yuzhuang Xu, Rui Liu, Yonghong School of Intelligent Systems Engineering Sun Yat-Sen University Guangdong Guangzhou510275 China Guangdong Provincial Key Laboratory of Intelligent Transportation System Guangdong Guangzhou510275 China Guangdong Provincial Engineering Research Centre for Traffic Environmental Monitoring and Control Guangdong Guangzhou510275 China

ISBN: (纸本)9781510673540

With the rapid growing of vehicle population, NOx has gradually become a key factor restricting the prevention and control of O3 pollution in China. High-resolution vehicle emission inventories are essential for the development of scientific and efficient pollution prevention and control policies. In this study, a bottom-up approach is adopted to develop a high temporal and spatial resolution vehicle NOx emission inventory for Guangzhou in 2021 based on real-time road network hourly-scale traffic data detected by 5,198 AVI devices. The study further examines the prominent emission vehicle types, emission periods, and emission hotspots in different regions (11 administrative districts, central urban areas, and non-central urban areas) to facilitate a detailed analysis and traceability of high-pollution events. The results of the study showed that the average daily NOx emission from vehicles was 196.15 t/day and the average daily emission intensity was 15.82 kg/(dayžkm). Diesel trucks, medium & heavy diesel trucks, and diesel trucks with China III or lower emission standards are the prominent vehicles with low occupancy and high emissions. In terms of spatial distribution, HDTs are the main contributors in the non-central urban areas, while heavy passenger vehicles and light duty trucks are the main contributors in the central urban areas, and buses also contribute a slightly higher percentage compared to the non-central urban areas. To meet the demand of freight transportation, the distribution of NOx emission hotspots shows a pattern of dispersion outward along the beltway network centred on Baiyun District. A more detailed traceability analysis of the high NOx emission contribution is used to assist in the development of pollution prevention policies. © 2024 SPIE.

关键词： Trucks

来源：评论

学校读者我要写书评

暂无评论

Data-driven technology of fault diagnosis in railway point machines:review and challenges

引用

Transportation Safety and Environment 2022年第4期4卷 19-32页

作者： Xiaoxi Hu Yuan Cao Tao Tang Yongkui Sun State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China National Engineering Research Center of Rail Transportation Operation Control System Beijing Jiaotong UniversityBeijing 100044China.

Safety and reliability are absolutely vital for sophisticated Railway Point Machines(RPMs).Hence,various kinds of sensors and transducers are deployed on RPMs as much as possible to monitor their behaviour for detection of incipient faults and anticipation using data-driven *** paper firstly analyses and summarizes six RPMs’characteristics and then reviews the data-driven algorithms applied to fault diagnosis in RPMs during the past *** provides not only the process and evaluation metrics but also the pros and cons of these different ***,regarding the characteristics of RPMs and the existing studies,eight challenging problems and promising research directions are pointed out.

关键词： Railway point machine(RPM) fault diagnosis data-driven technology condition monitoring

来源：评论

学校读者我要写书评

暂无评论

A Novel Modulation Recognition Algorithm for Satellite Communication and TT&C Signals 2

A Novel Modulation Recognition Algorithm for Satellite Commu...

引用

2nd International Signal Processing, Communications and engineering Management Conference, ISPCEM 2022

作者： Zhang, Dongwei Liang, Xiaolong Huang, Canyu Shang, Yaobo Air Traffic Control and Navigation School Air Force Engineering University Shaanxi Key Laboratory of Meta-Synthesis for Electronic and Information System Xi'an China

ISBN: (纸本)9781665492713

Electromagnetic signal modulation mode is one of the key elements of battlefield technical parameter information. This paper proposes an efficient modulation recognition algorithm for satellite communication and TT&C signals based on decision tree, which can accurately identify eight satellite modulation modes, including BPSK, QPSK, 2FSK, 4FSK, 16QAM, BPSK/PM, QPSK/PM and 2FSK/PM. The spectrum characteristics of the modulation methods commonly used in satellite communication and TT&C signals are firstly analyzed, and the main differences between and within categories of modulation methods of satellite signals are summarized;Then, rational feature parameters are selected and designed, and a complete modulation recognition process is proposed based on these parameters;Finally, the correctness and performance of the proposed recognition algorithm are evaluated by numerical simulation. The simulation results show that when the SNR (signal-to-noise ratio) of the proposed algorithm is more than 4dB, the modulation recognition accuracy of the eight satellite communication/TT&C signals can reach above 95%. © 2022 IEEE.

关键词： Quadrature phase shift keying

来源：评论

学校读者我要写书评

暂无评论

Distributed Optimal Formation control of Multiple Unmanned Surface Vehicles With Stackelberg Differential Graphical Game

IEEE Transactions on Artificial Intelligence

引用

IEEE Transactions on Artificial Intelligence 2024年第8期5卷 4058-4073页

作者： Yu, Kunting Li, Yongming Lv, Maolong Tong, Shaocheng Liaoning University of Technology College of Science Liaoning Jinzhou121001 China Dalian Maritime University Navigation College Liaoning Dalian116026 China Air Force Engineering University National Key Laboratory of Unmanned Aerial Vehicle Technology National Key Laboratory of Aerospace Power System and Plasma Technology College of Air Traffic Control and Navigation Shanxi Xi'an710051 China

In this work, a cooperative formation control methodology is proposed for multiple six-degree-of-freedom (six-DoF) unmanned surface vehicles (USVs) subject to input saturation. Our method includes several key steps. To begin, we formulate the optimal formation control problem for USVs as Stackelberg differential graphical games. According to this design principle, each USV is partitioned into a primary follower and a secondary follower. The primary followers coalesce into one team, while the secondary followers constitute another team independently. Second, a new type of barrier Lyapunov function (BLF) with a hyperbolic tangent function is introduced to indirectly constrain velocity vector. Third, an auxiliary system is established to compensate for the input saturation. Then, the Lyapunov stability theory is employed to prove that all closed-loop signals of multiple USVs are semiglobal uniform ultimate boundedness (SGUUB). Finally, we present the simulation results of our proposed control scheme. These results demonstrate the effectiveness and feasibility of our proposed methodology for cooperative formation control of multiple USVs. © 2020 IEEE.

关键词： Reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Variation of spatio-temporal distribution of on-road vehicle emissions based on real-time RFID data

引用

Journal of Environmental Sciences 2022年第6期34卷 151-162页

作者： Yonghong Liu Wenfeng Huang Xiaofang Lin Rui Xu Li Li Hui Ding School of Intelligent Systems Engineering Sun Yat-sen UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Intelligent Transportation System Guangzhou 510006China Guangdong Provincial Engineering Research Center for Traffic Environmental Monitoring and Control Guangzhou 510006China Shantou Municipal Urban Public Transportation Management Office Shantou 515000China

High-resolution vehicular emissions inventories are important for managing vehicular pollution and improving urban air quality. This study developed a vehicular emission inventory with high spatio-temporal resolution in the main urban area of Chongqing, based on realtime traffic data from 820 RFID detectors covering 454 roads, and the differences in spatiotemporal emission characteristics between inner and outer districts were analysed. The result showed that the daily vehicular emission intensities of CO, hydrocarbons, PM2.5, PM10,and NO_(x) were 30.24, 3.83, 0.18, 0.20, and 8.65 kg/km per day, respectively, in the study area during 2018. The pollutants emission intensities in inner district were higher than those in outer district. Light passenger cars(LPCs) were the main contributors of all-day CO emissions in the inner and outer districts, from which the contributors of NO_(x) emissions were different. Diesel and natural gas buses were major contributors of daytime NO_(x) emissions in inner districts, accounting for 40.40%, but buses and heavy duty trucks(HDTs) were major contributors in outer districts. At nighttime, due to the lifting of truck restrictions and suspension of buses, HDTs become the main NO_(x) contributor in both inner and outer districts,and its three NO_(x) emission peak hours were found, which are different to the peak hours of total NO_(x) emission by all vehicles. Unlike most other cities, bridges and connecting channels are always emission hotspots due to long-time traffic congestion. This knowledge will help fully understand vehicular emissions characteristics and is useful for policymakers to design precise prevention and control measures.

关键词： Spatio-temporal distribution Link-level vehicular emission inventory Real-time RFID data HDTs Chongqing

来源：评论

学校读者我要写书评

暂无评论

Modeling and Verification of Inter-Station Section Direction control Function Applicable to TBTC and CBTC 10

Modeling and Verification of Inter-Station Section Direction...

引用

10th International Conference on Information systems and Computing Technology, ISCTech 2022

作者： Pan, Liang Zhang, Lei CASCO SIGNAL LTD. System Integration Department Shanghai China Engineering Tongji University Tongji University Department of Traffic Information and Control Shanghai China

ISBN: (纸本)9798350332933

In the process of requirement analysis of Interstation Section Direction control function applicable to TBTC and CBTC, to prevent the introduction of inherent safety defects due to misunderstanding of requirements. The formal method is used to improve the accuracy of describing the functional requirements of Inter-station Section Direction control, enhance the rationality of design, and reduce the risk of introducing safety defects. First, the EVENT-B language model of each layer is established by using state transition diagram and refinement strategy, and the safety characteristics of the system are verified by proving the invariant proof obligation. Through the accuracy and hierarchy of the formal modeling process and the corresponding verification activities, it is proved that the method is feasible and efficient. © 2022 IEEE.

关键词： Defects

来源：评论

学校读者我要写书评

暂无评论

A High-precision Time Synchronization Algorithm for Aviation Swarm Task Cooperation 2

A High-precision Time Synchronization Algorithm for Aviation...

引用

2nd IEEE International Conference on Electronic Technology, Communication and Information, ICETCI 2022

作者： Yaobo, Shang Dongwei, Zhang Lei, Wang Zhe, Li Shujing, Li Air Traffic Control and Navigation College Air Force Engineering University Xi'an China Shaanxi Key Laboratory of Meta-Synthesis for Electronic and Information System Xi'an China

ISBN: (数字)9781728181158

ISBN: (纸本)9781728181158

Aiming at the high-precision time synchronization problem of aviation swarm task cooperation, a high-precision time synchronization algorithm suitable for this working environment is proposed. Based on RTT-REP principle, firstly, the influence of node mobility on synchronization accuracy under the condition of system maneuvering is analyzed, and it is proved that synchronization accuracy is closely related to relative distance and relative movement speed. Then, a method of eliminating maneuver error based on state sharing is put forward. This method shares position information through communication system, and then uses coordinate transformation to measure relative movement speed and relative distance to eliminate displacement error. Finally, the test methods are designed under static conditions in the laboratory and dynamic conditions in the field, and the performance of the system is tested. The experimental results show that the synchronization accuracy error of this system is less than 20ns, which proves that this method has high synchronization accuracy and strong practicability. © 2022 IEEE.

关键词： Errors

来源：评论

学校读者我要写书评

暂无评论

Invulnerability Evaluation of UAV Swarms Communication Network Based on Node Influence

Invulnerability Evaluation of UAV Swarms Communication Netwo...

引用

International Conference on Guidance, Navigation and control, ICGNC 2020

作者： Hou, Yueqi Liang, Xiaolong Qi, Duo Zhang, Jiaqiang Ren, Baoxiang Li, Ye Aviation Swarm Technology and Operational Application Laboratory Air Traffic Control and Navigation College Air Force Engineering University Xi’an710051 China Shaanxi Key Laboratory of Meta-Synthesis for Electronic and Information System Xi’an710051 China Air Traffic Control and Navigation College Air Force Engineering University Xi’an710051 China

ISBN: (纸本)9789811581540

Aiming at the damage of UAV swarms communication network in the denied environment, this paper proposes a method of invulnerability evaluation based on the node influence. Considering the node connectivity and its position in the network topology, the network efficiency reductions after node deletion and node degree are taken to measure the node influence. Based on the node influence, a network invulnerability entropy model is established, which can better represent the significance and dispersion of nodes with different influence in the network, to measure the network invulnerability when nodes are attacked. The simulation results show that the proposed method can better distinguish the difference of invulnerability between two UAV swarm communication networks with similar performance, and provide a theoretical basis for the design and optimization of the network structure. © 2022, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

来源：评论

学校读者我要写书评

暂无评论

User-assisted Caching Strategy Based on Reverse Auction and Recommendation in Railway Station 5

User-assisted Caching Strategy Based on Reverse Auction and ...

引用

5th IEEE International Conference on Electronics Technology, ICET 2022

作者： Sun, Chenghao Wu, Hao Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety School of Electronics and Information Engineering Beijing China Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Frontiers Science Center for Smart High-speed Railway System Beijing China

ISBN: (纸本)9781665485081

In the field of high-speed railway communication, solving the growing demand for multimedia services of passengers has always been a problem. To provide users with stable video services, caching technology has received more and more attention. In this paper, we refine the details when users assist the on-board relay to cache videos in railway stations. Based on this scenario, we improve the existing asynchronous allocation strategy and propose a user-assisted caching strategy named sequential allocation algorithm with recommendation for caching videos. The experimental results show that the algorithm is superior to synchronous and asynchronous allocation algorithm in social revenue and user participation ratio. © 2022 IEEE.

关键词： Multimedia services

来源：评论

学校读者我要写书评

暂无评论

Operation Plan Optimization of High-Speed Railway Based on Flexible Grouping 7

Operation Plan Optimization of High-Speed Railway Based on F...

引用

7th International Conference on Electromechanical control Technology and Transportation, ICECTT 2022

作者： Li, Cheng Li, Feng Wang, Hui State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China Institute of Transportation System Science and Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9781510656659

Whether the high-speed rail train operation plan is reasonable has an important impact on the transportation efficiency and benefits. This paper focuses on the optimization of high-speed train operation plan under the condition of unbalanced passenger flow. We formulate an integrated mixed integer linear programming model by adopting the form of flexible grouping. The model comprehensively considers constraints such as train unit allocation and passenger flow loading. It aims to minimize the number of empty seats in all trains. The inputs to the model are train units and passenger demand. The allocation of train units is completely driven by passenger demand. Taking the Beijing-Shanghai high-speed railway as an example, the results show that the load rate of train services is 96.42%, which is much higher than the fixed grouping. Therefore, a flexible grouping operation plan proposed in this paper can effectively improve train units' utilization and reduce enterprises' operating costs. © 2022 SPIE

关键词： Integer programming

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：