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Effects of connected automated vehicle on stability and energy consumption of heterogeneous traffic flow system

Chinese Physics B 2024年第3期33卷 291-301页

作者：申瑾赵建东刘华清姜锐余智鑫 school of Systems Science Beijing Jiaotong UniversityBeijing 100044China Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport Beijing Jiaotong UniversityBeijing 100044China school of Maritime and transportation Ningbo UniversityNingbo 315000China

With the development of intelligent and interconnected traffic system,a convergence of traffic stream is anticipated in the foreseeable future,where both connected automated vehicle(CAV)and human driven vehicle(HDV)will *** order to examine the effect of CAV on the overall stability and energy consumption of such a heterogeneous traffic system,we first take into account the interrelated perception of distance and speed by CAV to establish a macroscopic dynamic model through utilizing the full velocity difference(FVD)***,adopting the linear stability theory,we propose the linear stability condition for the model through using the small perturbation method,and the validity of the heterogeneous model is verified by comparing with the FVD *** nonlinear theoretical analysis,we further derive the KdV-Burgers equation,which captures the propagation characteristics of traffic density ***,by numerical simulation experiments through utilizing a macroscopic model of heterogeneous traffic flow,the effect of CAV permeability on the stability of density wave in heterogeneous traffic flow and the energy consumption of the traffic system is *** analysis reveals emergent traffic *** experimental findings demonstrate that as CAV permeability increases,the ability to dampen the propagation of fluctuations in heterogeneous traffic flow gradually intensifies when giving system perturbation,leading to enhanced stability of the traffic ***,higher initial traffic density renders the traffic system more susceptible to congestion,resulting in local clustering effect and stop-and-go traffic ***,the total energy consumption of the heterogeneous traffic system exhibits a gradual decline with CAV permeability *** evidence has demonstrated the positive influence of CAV on heterogeneous traffic *** research contributes to providing theoretical guidance for future CAV applic

关键词： heterogeneous traffic flow CAV linear stability nonlinear stability energy consumption

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新型电力系统环境下煤电与新能源等多元资源协调优化运行及其挑战

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电网技术 2024年第8期48卷 3105-3113,I0004,I0005页

作者：孙大雁耿建杨胜春张粒子杨军峰乌晓江牟树君史磊夏秋国家电网有限公司国家电力调度控制中心北京市西城区100031 中国电力科学研究院有限公司江苏省南京市210003 华北电力大学电气与电子工程学院北京市昌平区102206 上海交通大学机械与动力工程学院上海市闵行区200000 北京低碳清洁能源研究院北京市昌平区102211 国网宁夏电力有限公司宁夏回族自治区银川市750000

我国新能源装机规模最大、且持续高速发展,电网运行面临新能源消纳与电力保障供应的双重挑战,需多方位提升系统灵活性,构建新型供给消纳体系,促进资源优化配置。立足我国电源结构和新能源快速发展态势,提出和分析了五大关键技术:煤电与... 详细信息

我国新能源装机规模最大、且持续高速发展,电网运行面临新能源消纳与电力保障供应的双重挑战,需多方位提升系统灵活性,构建新型供给消纳体系,促进资源优化配置。立足我国电源结构和新能源快速发展态势,提出和分析了五大关键技术:煤电与新能源灵活性运行能力提升技术、柔性电-氢-化系统集成设计与运行控制优化技术、多资源互补优化调度运行技术、容量和新型辅助服务市场机制及出清技术、煤电与新能源综合调节和优化运行系统应用技术,促进煤电与新能源的协调发展,推动构建适应我国国情的新能源供给消纳体系建设,推动电力系统的转型升级。

关键词：新型电力系统多元灵活资源优化调度灵活调节能力

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交通流“流速密能”图谱模型与应用

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中国公路学报 2024年第4期37卷 84-97页

作者：黄健畅宋国华北京交通大学交通运输学院北京100044 北京交通大学综合交通运输大数据应用技术交通运输行业重点实验室北京100044

交通流的物理本质是能量驱动的物质位移。为挖掘交通流和能量的关系,基于交通流功率分布模型探索建立了流量、速度、密度和能量四要素图谱。其中,能量(kJ·km^(-1)·h^(-1))在数学上描述为能耗因子(kJ·km^(-1)·veh^(-1))和交通流量(ve... 详细信息

交通流的物理本质是能量驱动的物质位移。为挖掘交通流和能量的关系,基于交通流功率分布模型探索建立了流量、速度、密度和能量四要素图谱。其中,能量(kJ·km^(-1)·h^(-1))在数学上描述为能耗因子(kJ·km^(-1)·veh^(-1))和交通流量(veh·h^(-1))的乘积。首先,基于均衡态交通流不同空间平均速度下的功率分布,建立随平均速度变化的能耗因子曲线;其次,基于4个经典交通流基本图模型(Greenshields、Greenberg、Underwood和Van Aerde)建立速度与流量关系;最后,结合流量和能耗因子得到流量-速度-密度-能量图谱。当能量转换效率为100%时:在速度-能量方面,流量对能量的变化起到主导作用,因此,随着速度上升能量呈现先上升后下降趋势;在密度-能量方面,随着密度上升能量同样先上升后下降,但由于密度和速度呈负相关,其变化原理与速度-能量相反;在流量-能量方面,同一流量可对应低速/高速下的拥堵/非拥堵状态,能耗因子随着流量上升呈现2种状态,能耗因子上升或能耗因子下降,但下降速率低于流量上升速率。该研究是面向能量网络制定精细化政策和优化能源网络设施设计的先行工作。

关键词：交通工程流速密能图谱功率分布能量交能融合

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利用VxD技术实现便携式微机监测系统

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铁路计算机应用 2003年第1期12卷 23-25页

作者：李建戴胜华蒋大明北方交通大学交通信息工程学院北京100044

便携式微机监测系统是根据铁路现场要求提出一种新型微机监测系统。介绍了基于VxD技术实现便携式微机监测的数据采集的软件结构,实现方法和关键技术。

关键词：便携式微机监测系统 VxD 数据采集软件结构铁路运输安全管理

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SHR-A1811(antibody-drug conjugate)in advanced HER2-mutant non-small cell lung cancer:a multicenter,open-label,phase 1/2 study

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Signal Transduction and Targeted Therapy 2024年第8期9卷 3483-3492页

作者： Ziming Li Zhengbo Song Wei Hong Nong Yang Yongsheng Wang Hong jian Zibin Liang Sheng Hu Min Peng Yan Yu Yan Wang Zicong Jiao Kaijing Zhao Ke Song You Li Wei Shi Shun Lu Shanghai Lung Cancer Center Shanghai Chest HospitalShanghai Jiaotong University School of MedicineShanghai 200030China Phase I Clinical Trial Ward Zhejiang Cancer HospitalHangzhou 310000China Department of Thoracic Oncology Zhejiang Cancer HospitalHangzhou 310000China Department of Lung&Gastrointestinal Oncology Hunan Cancer HospitalChangsha 410031China Thoracic Oncology Ward/Cancer Center West China Hospital of Sichuan UniversityChengdu 610041China Department of Thoracic Oncology The Fifth Affiliated Hospital of Sun Yat-Sen UniversityZhuhai 51900China Department of Medical Oncology Hubei Cancer HospitalWuhan 43000China Department of Oncology Renmin Hospital of Wuhan UniversityWuhan 430200China Department of Thoracic Medicine Harbin Medical University Cancer HospitalHarbin 150081China Department of Medical Oncology Cancer HospitalChinese Academy of Medical SciencesBeijing 100021China Geneplus-beijing CoLtd.Beijing 102206China jiangsu Hengrui Pharmaceuticals Co.Ltd.Shanghai 200120China

A dose-escalation and expansion,phase 1/2 study(***,NCT04818333)was conducted to assess the novel antibodydrug conjugate SHR-A1811 in pretreated HER2-altered advanced non-small cell lung cancer(NSCLC).Here,we report results from the phase 1 *** who had previously failed or were intolerant to platinum-based chemotherapy were enrolled and received SHR-A1811 intravenously at doses of 3.2 to 8.0 mg/kg every 3 *** escalation followed a Bayesian logistic regression model that included overdose control,with subsequent selection of tolerable levels for dose ***,63 patients were enrolled,including 43 receiving a recommended dose for expansion of 4.8 mg/*** patients had HER2-mutant ***-limiting toxicity occurred in one patient in the 8.0 mg/kg dose ***≥3 treatment-related adverse events occurred in 29(46.0%)*** patient in the 6.4 mg/kg cohort died due to interstitial lung *** of April 11,2023,the 4.8 mg/kg cohort showed an objective response rate of 41.9%(95%Cl 27.0-57.9),and a disease control rate of 95.3%(95%Cl 84.2-99.4).The median duration of response was 13.7 months,with 13 of 18 responses *** median progression-free survival was 8.4 months(95%CI 7.1-15.0).SHR-A1811 demonstrated favourable safety and clinically meaningful efficacy in pretreated advanced HER2-mutantNSCLC.

关键词： SHR HER2 doses

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基于北斗3号PPP-B2b信号的实时精密单点定位方法研究

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铁道学报 2024年第2期46卷 63-73页

作者：邓陈喜姜维王剑蔡伯根北京交通大学电子信息工程学院北京100044 北京交通大学轨道交通控制与安全国家重点实验室北京100044 北京市电磁兼容与卫星导航工程技术研究中心北京100044

针对IGS精密产品存在相应时延且在列车长时间高速运行下不便联网下载的问题,研究基于BDS-3提供的PPP-B2b服务的实时PPP方法。基于广播星历和PPP-B2b校正模型获取PPP-B2b实时精密产品,基于PPP模型及模糊度在线解算方法得到实时动/静态PP... 详细信息

针对IGS精密产品存在相应时延且在列车长时间高速运行下不便联网下载的问题,研究基于BDS-3提供的PPP-B2b服务的实时PPP方法。基于广播星历和PPP-B2b校正模型获取PPP-B2b实时精密产品,基于PPP模型及模糊度在线解算方法得到实时动/静态PPP结果,并利用实测数据对PPP-B2b轨道及钟差修正量级、实时PPP性能进行分析。20 min实验结果表明:实时动态PPP的北向定位精度为0.4172 m,东向定位精度为0.3041 m;实时静态PPP的北向定位精度为0.1005 m,东向定位精度为0.1741 m。基于PPP-B2b服务的实时PPP具有时效性优势,静态性能优于传统基于IGS精密产品的PPP,动态性能与之相当。

关键词： PPP-B2b 列车定位实时精密单点定位

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人地关系的系统动力学模型研究

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系统工程理论与实践 2003年第1期23卷 128-131页

作者：王建华顾元勋孙林岩西安交通大学管理学院陕西西安710049 清华大学用友软件公司博士后站北京100085

采用系统动力学的研究方法 ,建立起了人口总数与环境承载力之间的系统动力学模型 ,并在一定的假设基础上给出了三个关于人地关系的有代表性观念的模型 :冲突模型、掠夺模型以及和谐模型 .通过对这三个模型的分析 ,得出了人类与自然环境... 详细信息

采用系统动力学的研究方法 ,建立起了人口总数与环境承载力之间的系统动力学模型 ,并在一定的假设基础上给出了三个关于人地关系的有代表性观念的模型 :冲突模型、掠夺模型以及和谐模型 .通过对这三个模型的分析 ,得出了人类与自然环境长久共存的条件。

关键词：人地关系系统动力学模型冲突模型掠夺模型和谐模型

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Coordinating Pricing and Inventory Control in a Fluctuating Environment

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Acta Mathematicae Applicatae Sinica 2010年第2期26卷 187-204页

作者： Ju-liang Zhang jian Chen Xiang-sun Zhang Department of Logistics Management School of Economics and Management Beijing Jiaotong UniversityBeijing 100044 China Department of Management Science and Engineering School of Economics and Management Tsinghua Uni-versity Beijing 100084 China Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sci-ences Beijing 100190 China

This paper addresses the simultaneous determination of pricing and inventory replenishment strate- gies under a fluctuating environment. Specifically, we analyze the single item, periodic review model. The demand consists of two parts： the deterministic component, which is influenced by the price, and the stochastic component （perturbation）. The distribution of the stochastic component is determined by the current state of an exogenous Markov chain. The price that is charged in any given period can be specified dynamically. A replenishment order may be placed at the beginning of some or all of the periods, and stockouts are fully backlogged. Ordering costs that are lower semicontinuous, and inventory/backlog （or surplus） costs that are continuous with polynomial growth. Finite-horizon and infinite-horizon problems are addressed. Existence of optimal policies is established. Furthermore, optimality of （s,S,p）-type policies is proved when the ordering cost consists of fixed and proportional cost components and the surplus cost （these costs are all state-dependent） is convex.

关键词： Stochastic inventory management Markov chains pricing finite horizon infinite horizon

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An improved YOLOv7 for the state identification of sliding chairs in railway turnout

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High-Speed Railway 2024年第2期2卷 71-76页

作者： Yuan Cao Zongbao Liu Feng Wang Shuai Su Yongkui sun Wenkun Wang National Engineering Research Center of Rail transportation Operation and Control System Beijing Jiaotong UniversityBeijing 100044China school of Automation and Intelligence Beijing Jiaotong UniversityBeijing 100044China Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong UniversityBeijing 100044China Zhuzhou CRRC Times Electric Co. LTD.Zhuzhou 412001China

The sliding chairs are important components that support the switch rail conversion in the railway *** to the harsh environmental erosion and the attack from the wheel vibration,the failure rate of the sliding chairs accounts for up to 10%of the total failure number in ***,there is little research carried out in the existing literature to diagnose the deterioration states of the sliding *** fill out this gap,by utilizing the images containing the sliding chairs,we propose an improved You Only Look Once version 7(YOLOv7)to identify the state of the sliding ***,to meet the challenge brought by the small inter-class differences among the sliding chair states,we first integrate the Convolutional Block Attention Module(CBAM)into the YOLOv7 backbone to screen the information conducive to state ***,an extra detector for a small object is customized into the YOLOv7 network in order to detect the small-scale sliding chairs in ***,we revise the localization loss in the objective function as the Efficient Intersection over Union(EIoU)to optimize the design of the aspect ratio,which helps the localization of the sliding ***,to address the issue caused by the varying scales of the sliding chairs,we employ K-means++to optimize the priori selection of the initial anchor ***,based on the images collected from real-world turnouts,the proposed method is verified and the results show that our method outperforms the basic YOLOv7 in the state identification of the sliding chairs with 4%improvements in terms of both mean Average Precision@0.5(mAP@0.5)and F1-score.

关键词： Railway turnout Sliding chairs State identification Object detection

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Complex system and intelligent control: theories and applications

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Frontiers of Information Technology & Electronic Engineering 2019年第1期20卷 1-3页

作者： Jie CHEN Ben M.CHEN jian sun school of Automation Beijing Institute of Technology Tongji university Department of Mechanical and Automation Engineering Chinese University of Hong Kong Department of Electrical and Computer Engineering National University of Singapore

Complex systems are the systems that consist of a great many diverse and autonomous but interacting and interdependent components whose aggregate behaviors are nonlinear. As phased by Aristotle,'the whole is more than the sum of its parts;' properties of complex systems are not a simple summation of their individual *** systems are widespread. Typical examplesofcomplexsystemscanbefoundinthehuman brain,flocking formation of migrating birds,power grid,transportation systems,autonomous vehicles,social networks, and communication networks.

关键词： Complex system and intelligent control theories and applications UAV

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