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Trajectory analysis at intersections for traffic rule identification

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Geo-Spatial Information Science 2021年第1期24卷 75-84,I0010页

作者： chenxi wang Stefania Zourlidou Jens Golze Monika Sester Institute of Cartography and Geoinformatics Leibniz University HannoverHannoverGermany

In this paper,we focus on trajectories at intersections regulated by various regulation types such as traffic lights,priority/yield signs,and right-of-way *** test some methods to detect and recognize movement patterns from GPS trajectories,in terms of their geometrical and spatio-temporal *** particular,we first find out the main paths that vehicles follow at such *** then investigate the way that vehicles follow these geometric paths(how do they move along them).For these scopes,machine learning methods are used and the performance of some known methods for trajectory similarity measurement(DTW,Hausdorff,and Fréchet distance)and clustering(Affinity propagation and Agglomerative clustering)are compared based on clustering ***,the movement behavior observed at six different intersections is analyzed by identifying certain movement patterns in the speed-and time-profiles of *** show that depending on the regulation type,different movement patterns are observed at *** finding can be useful for intersection categorization according to traffic *** practicality of automatically identifying traffic rules from GPS tracks is the enrichment of modern maps with additional navigation-related information(traffic signs,traffic lights,etc.).

关键词： Traffic rules traffic regulators GPS trajectories intersection classification speed-profiles clustering similarity measures

Legal and Political Practices in China's Central-Local Dynamics

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Fudan Journal of the Humanities and Social Sciences 2021年第4期14卷 523-547页

作者： chenxi wang School of Intellectual Property Nanjing University of Science and Technology200 Xiaolingwei StreetXuanwu DistrictNanjing 210094JiangsuChina

This article investigates China's central-local dynamics in the process of adjusting regulatory discrepancies among different levels of government from both legal and political *** finds that in China’s central-local interactions,legal practices have been rather limited and only developed lately,and political practices have long been in place to fill the blank left by legal practices and accommodate China's growing rule of law in the contemporary *** legal practices,this study explores the legislative review interactions between the central and local state organs which have been opaque and experience a leap forward from 2017 with China's advancement of the rule of *** for political practices,this study focuses on two types of interactions between the central and local governments,top-down campaigns and bottom-up *** and bargaining have a long history in China’s central-local dynamics and intertwine with China’s contemporary legal development in policy-making and implementation *** on data collected from China's practical governance,this article attempts to provide a roadmap in the explanation of the patterns of central-local dynamics from a multi-disciplinary angle and contributes to a comprehensive understanding of China5s central-local dynamics that smooth central-local tensions and drive China forward along the economic development path as a monolith.

关键词： China Central-local relations Legislative review Campaign Bargaining

Multicomponent Nanoparticles Synergistic One-Dimensional Nanofibers as Heterostructure Absorbers for Tunable and Efficient Microwave Absorption

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Nano-Micro Letters 2023年第1期15卷 236-251页

作者： chenxi wang Yue Liu Zirui Jia Wanru Zhao Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-Fibers and Eco-TextilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071People’s Republic of China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071ShandongPeople’s Republic of China Weihai Innovation Institute Qingdao UniversityQingdao 264200ShandongPeople’s Republic of China

Application of novel radio technologies and equip-ment inevitably leads to electromagnetic ***-dimensional polymer-based composite membrane structures have been shown to be an effective strategy to obtain high-performance microwave ***,we reported a one-dimensional N-doped carbon nanofibers material which encapsulated the hollow Co_(3)SnC_(0.7) nano-cubes in the fiber lumen by *** charge stacking formed between nanoparticles can be channeled by longitudinal fibrous *** dielectric constant of the fibers is highly related to the carbonization temperature,and the great impedance matching can be achieved by synergetic effect between Co_(3)SnC_(0.7) and carbon *** 800℃,the necklace-like Co_(3)SnC_(0.7)/CNF with 5%low load achieves an excellent RL value of−51.2 dB at 2.3 mm and the effective absorption bandwidth of 7.44 GHz with matching thickness of 2.5 *** multiple electromagnetic wave(EMW)reflections and interfacial polarization between the fibers and the fibers internal contribute a major effect to attenuating the *** strategies for regulating electromagnetic performance can be expanded to other electromagnetic functional materials which facilitate the development of emerging absorbers.

关键词： Electrostatic spinning Necklace-structured nanofibers Broadband response Electromagnetic wave absorption

A multifunctional osteogenic system of ultrasonically spray deposited bone-active coatings on plasma-activated magnesium

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Journal of Magnesium and Alloys 2023年第8期11卷 2719-2739页

作者： Hui Fang Shicheng Zhou Xiaoyun Qi chenxi wang Yanhong Tian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Biomimetic bone-active coatings composed of inorganic nano-hydroxyapatite(i.e.,nHA)and organic silk fibroin(i.e.,SF)are layer-by-layer deposited on Mg-Zn-Ca alloy by a controllable ultrasonic spray ***,plasma activation is developed as a promising strategy to pretreat magnesium surfaces,which facilitates the direct adhesion of coatings with enhanced bonding *** this work,we engineer the nHA/SF composite coatings with excellent mechanical properties and adhesion *** optimized parameters of ultrasonic spray bring significant influence on the surface morphologies of *** by hybrid plasma of oxygen and nitrogen(i.e.,O_(2)/N_(2) plasma),the activated Mg-Zn-Ca surfaces are uniformly covered by a robust and compact nHA/SF composite coating,establishing a multifunctional system with superior corrosion resistance and biological ***,secondary oxygen plasma treatment of nHA/SF coatings(A-nHA/SF)promotes the hydrophilicity,leading to a rapid self-repair effect from surface *** improvement of anti-corrosion and self-repair provides a dependable platform for better cell adhesion,proliferation,spreading and *** favorable factors contribute to the preferable in vivo biocompatibility and the promotion of newly formed bones for the A-nHA/SF-coated Mg *** study lays important foundations for coating strategy on biomedical magnesium alloy as multifunctional osteogenic system in bioactive implantable applications.

关键词： Magnesium alloy Hydroxyapatite Silk fibroin Biocompatibility Self-repair

Hierarchical Task Planning for Power Line Flow Regulation

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 29-40页

作者： chenxi wang Youtian Du Yanhao Huang Yuanlin Chang Zihao Guo the Ministry of Education Key Lab for Intelligent Networks and Network Security Xi'an Jiaotong UniversityXi'an 713599China the State Key Laboratory of Power Grid Safety and Energy Conservation China Electric Power Research InstituteBeijing 100192China

The complexity and uncertainty in power systems cause great challenges to controlling power *** a popular data-driven technique,deep reinforcement learning(DRL)attracts attention in the control of power ***,DRL has some inherent drawbacks in terms of data efficiency and *** paper presents a novel hierarchical task planning(HTP)approach,bridging planning and DRL,to the task of power line flow ***,we introduce a threelevel task hierarchy to model the task and model the sequence of task units on each level as a task planning-Markov decision processes(TP-MDPs).Second,we model the task as a sequential decision-making problem and introduce a higher planner and a lower planner in HTP to handle different levels of task *** addition,we introduce a two-layer knowledge graph that can update dynamically during the planning procedure to assist *** results conducted on the IEEE 118-bus and IEEE 300-bus systems demonstrate our HTP approach outperforms proximal policy optimization,a state-of-the-art deep reinforcement learning(DRL)approach,improving efficiency by 26.16%and 6.86%on both systems.

关键词： Knowledge graph power line flow regulation reinforcement learning task planning

The virological impacts of SARS-CoV-2 D614G mutation

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Journal of Molecular Cell Biology 2021年第10期13卷 712-720页

作者： chenxi wang You Zheng Zubiao Niu Xiaoyi jiang Qiang Sun Laboratory of Cell Engineering Institute of BiotechnologyResearch Unit of Cell Death MechanismChinese Academy of Medical ScienceBeijing 100071China

The coronavirus diseases 2019(COVID-19)caused by the infection of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)emerged in December 2019 has caused more than 140 million infections worldwide by the end of April *** an enveloped single-stranded positive-sense RNA virus,SARS-CoV-2 underwent constant evolution that produced novel variants carrying mutation conferring fitness *** current prevalent D614G variant,with glycine substituted for aspartic acid at position 614 in the spike glycoprotein,is one of such variants that became the main circulating strain worldwide in a short period of *** the past year,intensive studies from all over the world had defined the epidemiological characteristics of this highly contagious variant and revealed the underlying *** review aims at presenting an overall picture of the impacts of D614G mutation on virus transmission,elucidating the underlying mechanisms of D614G in virus pathogenicity,and providing insights into the development of effective therapeutics.

关键词： SARS-CoV-2 COVID-19 D614G infectivity virus mutation

Data-driven Reactive Power Optimization of Distribution Networks via Graph Attention Networks

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 874-885页

作者： Wenlong Liao Dechang Yang Qi Liu Yixiong Jia chenxi wang Zhe Yang Wind Engineering and Renewable Energy Laboratory Ecole Polytechnique Federale de Lausanne(EPFL)Lausanne 1015Switzerland the College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China the College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China the Department of Electrical and Electronic Engineering(Energy Digitalization Laboratory) The University of Hong KongHong KongChina the Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Reactive power optimization of distribution networks is traditionally addressed by physical model based methods,which often lead to locally optimal solutions and require heavy online inference time *** improve the quality of the solution and reduce the inference time burden,this paper proposes a new graph attention networks based method to directly map the complex nonlinear relationship between graphs(topology and power loads)and reactive power scheduling schemes of distribution networks,from a data-driven *** graph attention network is tailored specifically to this problem and incorporates several innovative features such as a self-loop in the adjacency matrix,a customized loss function,and the use of max-pooling ***,a rulebased strategy is proposed to adjust infeasible solutions that violate *** results on multiple distribution networks demonstrate that the proposed method outperforms other machine learning based methods in terms of the solution quality and robustness to varying load ***,its online inference time is significantly faster than traditional physical model based methods,particularly for large-scale distribution networks.

关键词： Reactive power optimization graph neural network distribution network machine learning data-driven

Surface co-hydrophilization via ammonia inorganic strategy for low-temperature Cu/SiO_(2) hybrid bonding

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Journal of Materials Science & Technology 2023年第18期149卷 161-166页

作者： Qiushi Kang Ge Li Zhengda Li Yanhong Tian chenxi wang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

*** During massive data movements in digital computing systems,several issues have emerged such as high latency,energy ineffi-ciency,and low bandwidth due to the physical separation of pro-cessor and memory units(so-called memory wall)[1-3].To miti-gate the data-movement limitations,three-dimensional(3D)chip integration becomes an optimal solution within von Neumann ar-chitecture since the dense vertical interconnections shorten the distance between chips[4,5].However,the extensively used micro solder bumps for 3D chip stacking impede the further improve-ment of interconnection pitch(<10μm).In this scenario,the Cu/SiO_(2) hybrid bonding technology came into *** to the coexistence of planarized Cu connections and SiO_(2) layers,Cu/SiO_(2) hybrid bonding is the desirable enabler of submicron ultra-dense integration(<1μm),which benefits from Cu-Cu and SiO_(2)-SiO_(2) homogeneous direct bonding replacing micro bumps and underfill[6,7].

关键词： bonding interconnection integration

Rumors and price efficiency in stock market:An empirical study of rumor verification on investor Interactive platforms

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China Journal of Accounting Research 2024年第2期17卷 164-192页

作者： Wenting Zhang chenxi wang School of Business Sun Yat-sen UniversityChina

Using rumor verification data from investor interactive platforms,we investigate the effect of stock market rumors on price *** find favorable rumors are positively correlated with stock price synchronicity,while unfavorable rumors are negatively correlated with stock price *** favorable and unfavorable rumors are positively correlated with stock mispricing levels,and stock price crash *** tests reveal that favorable rumors about industry leaders have industry spillover *** effect of rumors on mispricing levels and stock price crash risk are more pronounced when there are more retail *** analysis shows stronger detrimental impacts of rumors on price efficiency for small-cap companies,companies with low information transparency and companies with low institutional ownership.

关键词： Rumors Price efficiency Stock price synchronicity Mispricing Stock price crash risk