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Indoor Uncertain Semantic Trajectory Similarity Join

Journal of Computer Science & technology 2024年第6期39卷 1441-1465页

作者： Hong-Bo Yin Dong-Hua Yang Kai-Qi Zhang Hong Gao Jian-Zhong Li Faculty of Computing Harbin Institute of TechnologyHarbin 150001China Center of Analysis Measurement and ComputingHarbin Institute of TechnologyHarbin 150001China Faculty of Computer Science and Control Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

With the widespread deployment of indoor positioning systems, an unprecedented scale of indoor trajectories is being produced. By considering the inherent uncertainties and the text information contained in such an indoor trajectory, a new definition named Indoor Uncertain Semantic Trajectory is defined in this paper. In this paper, we focus on a new primitive, yet quite essential query named Indoor Uncertain Semantic Trajectory Similarity Join (IUST-Join for short), which is to match all similar pairs of indoor uncertain semantic trajectories from two sets. IUST-Join targets a number of essential indoor applications. With these applications in mind, we provide a purposeful definition of an indoor uncertain semantic trajectory similarity metric named IUS. To process IUST-Join more efficiently, both an inverted index on indoor uncertain semantic trajectories named 3IST and the first acceleration strategy are proposed to form a filtering-and-verification framework, where most invalid pairs of indoor uncertain semantic trajectories are pruned at quite low computation cost. And based on this filtering-and-verification framework, we present a highly-efficient algorithm named Indoor Uncertain Semantic Trajectory Similarity Join Processing (USP for short). In addition, lots of novel and effective acceleration strategies are proposed and embedded in the USP algorithm. Thanks to these techniques, both the time complexity and the time overhead of the USP algorithm are further reduced. The results of extensive experiments demonstrate the superior performance of the proposed work.

关键词： filtering-and-verification framework indoor uncertain semantic trajectory inverted index trajectory similarity join

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Interaction Quantification of MTDC Systems Connected with Weak AC Grids

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

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Design of Vehicle Bus Signal Simulation Device 5

Design of Vehicle Bus Signal Simulation Device

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5th International Conference on Sensing, measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2024

作者： Chen, Sirui Wang, Shiji Chen, Wenke Li, Baohua Qiao, Jiaqing School of Electronics and Information Engineering Harbin Institute of Technology Harbin China Beijing Aerospace Measurement and Control Technology Co. Ltd Beijing China

ISBN: (纸本)9798331529192

As the functions of automobiles continue to increase and become more intelligent, the data exchange and communication between onboard electronic devices have become increasingly important. To ensure the reliability and stability of these systems in practical applications, it is necessary to manually simulate the testing and verification of ECUs with erroneous bus data packets. This paper designs a vehicular bus signal simulation device that can simulate the generation of CAN, LIN, FlexRay, CXPI, and SENT bus signals and their fault data packets. The hardware part of the device consists of an arbitrary waveform generator and an upper computer, while the software part uses QT to design the user interface and C++ to write the programmable software. Finally, experiments have verified the performance and accuracy of the simulation device. The waveforms captured by the digital storage oscilloscope are consistent with the expected input parameters, proving the effectiveness of the device. This device has significant application value in the development, teaching, and training of automotive electronic systems, capable of reducing the reliance on real-vehicle testing, and reducing test costs and time. © 2024 IEEE.

关键词： C++ (programming language)

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PCB vibration test program design 6

PCB vibration test program design

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6th International Conference on System Reliability and Safety engineering, SRSE 2024

作者： Wang, Hao Zhang, Han Qi, Jia China Institute of Marine Technology and Economy Quality and Reliability Center Beijing China Harbin University of Science and Technology School of Measurement-Control Technology and Communications Engineering Harbin China

ISBN: (纸本)9798350356083

This paper presents a vibration testing program designed to evaluate the reliability of PCB boards in complex underwater environments. The study thoroughly examines the structural components of the PCB and the vibrations it encounters throughout its lifecycle. Based on the characteristics of vibrations at different stages, corresponding testing standards and methods were developed, providing a scientific basis for the reliability assessment of PCB boards. © 2024 IEEE.

关键词： Life cycle

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A strategy for accurate prediction of dielectric permittivity and dielectric strength in polyimide

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High Voltage 2024年第6期9卷 1393-1401页

作者： Yu Wang Changhai Zhang Jiaqi Lin Hongguo Sun Ying Yang Wenlong Yang School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbinChina School of Science Harbin University of Science and TechnologyHarbinChina Polymer Composites Engineering Laboratory Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjingChina School of Measurement and Communication Engineering Harbin University of Science and TechnologyHarbinChina

A strategy was proposed to predict accurately the dielectric permittivity and dielectric strength based on the Onsager local field *** molecular dynamic simulation was utilised to analyse the dipole moment fluctuation in polyimide(PI)to reflect the polar-isation response of applied electric *** simulation results revealed that the optical dielectric permittivity and static dielectric permittivity were 2.62 and 3.34,showing that the electronic displacement polarisation of the PI acted as a major *** deviation between simulated and measured values of the frequency-dependent relative dielectric permittivity was no more than 5%,which exhibited high *** the polarisation response of the polar groups in the PI was at infrared frequencies,the conductive loss may be the dominant role in 102–106 Hz at room ***,the effect of Joule heat on the structure,dielectric permittivity and Young modulus was considered to accurately predict the dielectric strength of the PI(359 kV/mm),which was in agreement with experimental values in the *** results establish a clear correlation between structural characteristics and dielectric properties of the PI,which would be the theoretical insights into the design and synthesis of the PI with tailored dielectric properties.

关键词： dielectric strength permittivity

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Design Of The Fuel Supply System For The Fuel Dispenser Patent Test 9

Design Of The Fuel Supply System For The Fuel Dispenser Pate...

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9th International Conference on Mechanical and Electronics engineering, ICMEE 2023

作者： Li, Haiyang Liang, Yanzheng Yao, Xinhong Zhan, Biliang Shanghai Institute Of Measurement And Testing Technology Division Of Thermo Engineering And Energy Sources Measured Technology Shanghai China Anhui Test Measurement And Control Ltd. Hefei China

ISBN: (纸本)9798350307146

In order to provide a flowing fuel source for the measurement performance test device of fuel dispenser patent test, a fuel supply system was designed and manufactured. After the determination of the technical requirements for the fuel supply system, the structure, electrical and software design and key equipment selection were introduced at length in this paper. There are 3 kinds of ISOPAR L, D80, and D110 organic solvent (working medium) stored in 3 fuel tanks with actual capacity of 2m3, and the system has the functions of storage, circulation, temperature control of the working medium and fault self-inspection. In the electrical design, the DELTA DVP40EX200R PLC was selected as the core controller for the onsite equipment for its appropriate electrical resources and multiple auxiliary analog signal acquisition modules. And the human-machine interaction interface was the touch panel. After the design and manufacturing of the fuel supply system, a fuel dispenser metering performance test was conducted with the cooperation of the system. The test showed that the fuel supply system was designed reasonably and operated well. Furthermore, the fuel supply system designed in this article can not only be used for fuel dispenser pattern test, but also provide a solution for the automatic oil delivery system in oil depots. © 2023 IEEE.

关键词： Software design

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Node-Decomposition Privacy-Preserving for Finite-Time Secondary control of DC Microgrids

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IEEE Transactions on Smart Grid 2025年第4期16卷 3295-3304页

作者： Wu, Han Zhu, Si-Min Chai, Li Zhu, Zhen-Hua Tian, Yu-Chu Wuhan University of Science and Technology Engineering Research Center of Metallurgical Automation and Measurement Technology School of Artificial Intelligence and Automation Wuhan430081 China Zhejiang University State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Hangzhou310027 China Huzhou Institute of Industrial Control Technology Huzhou China Queensland University of Technology School of Computer Science BrisbaneQLD4001 Australia

In the distributed secondary control of DC microgrids, achieving both rapid convergence and robust information security is critical for enhancing control performance and maintaining power quality. However, current privacy-preserving approaches often compromise either control performance or privacy preservation performance. To address this challenge, this paper presents a node-decomposition privacy-preserving (NDPP) method for fully distributed, finite-time secondary control in DC microgrids. By splitting each node in the communication graph into multiple sub-nodes, the method enhances both convergence speed and privacy preservation without sacrificing control accuracy. Sub-nodes communicate within groups, and the topology of the generated graph is concealed from malicious nodes and eavesdroppers. Theoretical analysis is provided to prove finite-time voltage regulation and current sharing with privacy preservation against malicious nodes and external eavesdroppers. Simulations are conducted to verify the effectiveness of the method in maintaining control performance and power quality. © 2010-2012 IEEE.

关键词： Privacy by design

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TRAVERSABILITY ESTIMATION BASED ON VEHICLE CHARACTERISTICS AND ENVIRONMENTAL GEOMETRY 10

TRAVERSABILITY ESTIMATION BASED ON VEHICLE CHARACTERISTICS A...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： He, Naixiang Su, Qinghua Wang, Liyong Song, Yue Wang, Haodong Zhang, Haoyuan Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science & Technology University Beijing China School of Mechanical Engineering and Vehicles Beijing Institute of Technology Beijing China

ISBN: (纸本)9781837242672

In unstructured environments, ensuring the safe operation of autonomous vehicles necessitates precise perception and thorough analysis of the surrounding terrain. Existing traversability analysis methods frequently rely on data from a single sensor and fail to integrate vehicle characteristics with environmental geometric features. This limitation results in weak environmental perception and poor performance in traversability analysis. To address these challenges, this paper proposes an innovative approach. By fusing data from multiple LiDAR sensors, the method constructs a locally dense traversability map, significantly enhancing the completeness and reliability of terrain ***, this approach combines vehicle characteristics with multiple environmental geometric factors to generate a traversability layer. This integration leads to a more holistic understanding of the terrain, improving the vehicle's ability to navigate complex environments safely. The proposed method demonstrates outstanding performance in traversability estimation, enabling a more accurate evaluation of traversability. This, in turn, provides a solid guarantee for the safe driving of autonomous vehicles in various challenging *** system underwent rigorous testing in unstructured environments to validate its effectiveness. The test results indicate that the elevation maps and traversability layer generated by this method exhibit significant improvements in both detail and accuracy. These advancements ensure that autonomous vehicles can better perceive and navigate their surroundings, ultimately contributing to safer and more reliable autonomous driving in unstructured and complex terrains. © The Institution of engineering & technology 2024.

关键词： Tracked vehicles

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Combined Model Predictive control for Geosynchronous Satellite Station Keeping Using Electric Propulsion 42

Combined Model Predictive Control for Geosynchronous Satelli...

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42nd Chinese control Conference, CCC 2023

作者： Shi, Heng Liu, Xiaoxiang Wang, Shuo Mai, Ji Beijing Institute of Control Engineering Beijing100094 China Science and Technology on Space Intelligence Control Laboratory Beijing100094 China Beijing Aerospace Institute for Metrology and Measurement Technology Beijing100076 China

ISBN: (纸本)9789887581543

Novel combined model predictive control method is presented, which includes long-term trajectory planning, outer-loop model predictive trajectory and angular momentum control, and inner-loop attitude control. Firstly, the influence of long-period perturbation characteristics on long term station keeping of geosynchronous satellite is fully considered, and the station keeping trajectory is optimized for 3 months to 6 months. Then, taking the long-term planning results as the reference trajectory and considering the engineering constraint model, the outer-loop control is realized within 7 days to 14 days, so that the position trajectory meets the planning expectations and meets the requirements of orbit and angular momentum optimal control. The inner loop control adopts the attitude control method considering the continuous torque effect of small thrust, so as to meet the requirements of real-time angular momentum and attitude control with higher frequency. The method has been successfully verified by on-orbit flight tests, showing the characteristics of high control accuracy, high fuel utilization efficiency, and being adaptive to various engineering constraints. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Model predictive control

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Equivalent Ratio of Frequency Regulation Resources Based on Derivation of Open-Loop control Frequency Deviation 16

Equivalent Ratio of Frequency Regulation Resources Based on ...

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16th IEEE PES Asia-Pacific Power and Energy engineering Conference, APPEEC 2024

作者： Ning, Jia Wang, Hanxiang Wang, Ying School of Electric Power Engineering Nanjing Institute of Technology Nanjing China Southeast University Key Laboratory of Measurement and Control of Cse Ministry of Education Nanjing China

ISBN: (纸本)9798350386127

The conventional approach to frequency regulation predominantly relies on thermal and hydroelectric power generation units. As a growing variety of frequency regulation resources become accessible to power systems, there is significant variation in their performance characteristics, it is important to quantify their capabilities in the frequency service markets. This study introduces a technique to calculate the equivalent ratio of these resources by analyzing their primary response to frequency deviations derived from open-loop control. Based on the rotor motion equation of the generator, this paper constructs a load frequency control model incorporating two distinct regulation resources, linearize their outputs, and integrate them into the model. Through differential equations, this paper derives analytical expressions for the frequency deviation curve, enabling the determination of key frequency metrics. The equivalent ratio is then calculated by comparing the output power of resources with similar performance indicators. Finally, the paper investigates the impact of diverse parameters on the computation of the equivalent ratio employing simulation-based experimental analysis. © 2024 IEEE.

关键词： Open loop control

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