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混合驾驶环境下的早高峰出行行为分析

系统工程理论与实践 2021年第7期41卷 1819-1827页

作者：朱玲卢晓珊合肥工业大学汽车与交通工程学院合肥230009

本文同时考虑了自动驾驶汽车与普通汽车在行车与停车两方面的行为差异,研究了两者共存时瓶颈交通走廊的早高峰出行行为.考虑了以下三种情形:1)自动驾驶汽车仅提高道路通行能力;2)自动驾驶汽车仅降低出行时间价值(VOT);3)同时影响道路通... 详细信息

本文同时考虑了自动驾驶汽车与普通汽车在行车与停车两方面的行为差异,研究了两者共存时瓶颈交通走廊的早高峰出行行为.考虑了以下三种情形:1)自动驾驶汽车仅提高道路通行能力;2)自动驾驶汽车仅降低出行时间价值(VOT);3)同时影响道路通行能力与VOT.分析了每种情形下所有可能的均衡出行模式,并推导发现,晚出发的出行方式具有更低的均衡出行成本.最后通过数值算例,分别讨论了自动驾驶汽车渗透率对走行、延误和空驶等成本的影响,以及通行能力、VOT的变化对系统总成本的影响.

关键词：自动驾驶汽车瓶颈模型出行模式异质性

ANALYSES OF LOCATION-PRICE GAME ON NETWORKS WITH STOCHASTIC CUSTOMER BEHAVIOR AND ITS HEURISTIC ALGORITHM

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Journal of Systems Science & Complexity 2010年第4期23卷 701-714页

作者： xiaoshan lu Jian LI Fengmei YANG School of Science Beijing University of Chemical Technology Beijing 100029 China School of Economics and Management Beihang University Beijing 100191 China. School of Economics and Management Beijing University of Chemical Technology Beijing 100029 China School of Science Beijing University of Chemical Technology Beijing 100029 China

In this paper,a two-stage model is developed to investigate the location strategy andthe commodity pricing strategy for a retail firm that wants to enter a spatial market with multiplecompetitive facilities,where a competitor firm is already operating as a monopoly with several *** market shares are calculated based on the stochastic customer behavior on *** provide a sufficient condition for the existence of equilibrium prices in the price game for thefirst *** existence and uniqueness of the pure strategy Nash equilibrium price with a specifiedutility function are proved in the subgame.A metaheuristic based on tabu search is proposed tosearch the optimal location-price solution of the *** addition,the authors provide two numericalexamples to illustrate how to obtain the optimal solution and conduct sensitivity *** analysisshows that the best location decision is robust for the follower firm,price game is more intense whenincomes of consumers are lower or there are more substitution products,and neither chain retail gainsfrom the price competition.

关键词： Competitive location heuristic Nash equilibrium networks pricing tabu search two- stage model.

Rail Expansion Devices Monitored by FBG Sensors on an Urban Railway Viaduct

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Photonic Sensors 2014年第2期4卷 173-179页

作者： Weilai LI Jin PANG xiaoshan lu Jie LIU National Engineering Lab of Fiber Optic Sensing Technology Wuhan University of Technology 122 Luoshi RoadWuhan 430070 China Key Lab of Fiber Optic Sensing Technology and Information Processing Wuhan University of Technology 122 LuoshiRoad Wuhan 430070 China

The fiber Bragg grating （FBG） sensing technology was used to monitor the situation of a crevice of the continuous beam joint and rails near rail expansion devices on a viaduct of the urban railway. The monitoring items consisted of the rail temperature, rail displacement, viaduct beam displacement, and strain of sliding rail in the rail expansion device section. The strain sensor was a prefabricate FBG strain gauge, the displacement sensor with different scales used an FBG stress ring, and the FBG of the temperature sensor was pre-drawn and fixed in a metal tube. Compensation sensors were used to balance environmental temperature changes. All FBGs were suspended adhered, therefore the chirped phenomenon of the FBG reflection peak was avoided, and the measurement accuracy was improved. The monitoring results matched to the manual test and theoretical estimation.

关键词： Fiber Bragg grating urban rail viaduct rail expansion device monitor

FBG Stress-Sensibilized Monitor for Railway Switch Pole On-Line Monitoring

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Photonic Sensors 2014年第3期4卷 269-273页

作者： Weilai LI Jie LIU Jianjun PAN Jin PANG xiaoshan lu National Engineering Lab of Fiber Optic Sensing Technology Wuhan University of Technology Wuhan 430070 China Key Lab of Fiber Optic Sensing Technology and Information Processing Ministry of Education Wuhan University ofTechnology Wuhan 430070 China

The fiber Bragg grating （FBG） sensing technology is used to dynamically monitor multiple parameters of railway switch machine poles, including time of movement, direction and quantity of loading and locking force, and states of loading resistance. This paper presents the design and implementation of a railway switch pole strain on-line monitoring system based on the FBG stress-sensibilized monitor for a Siemens S700K switch machine. The ring shape FBG strain gauge and stress-sensibilized methods significantly increased the monitoring sensitivity. Installing approaches adapted the harsh environment in the railway application. The monitoring results showed the high sensitivity and high reliability of this monitoring system. This application provides a long-term and on-line detecting method which could meet railway switch condition monitoring demands of more than 100,000 switch machines in the country.

关键词： Fiber Bragg grating railway switch pole strain dynamically monitor

Rail temperature rise characteristics caused by linear eddy current brake of high-speed train

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第6期1卷 448-456页

作者： xiaoshan lu Yunfeng Li Mengling Wu Jianyong Zuo Wei Hu Institute of Railway Transit Tongji University CSR Qingdao Sifang Locomotive Co. Ltd. Ecole Nationale Superieure d'Arts et Metiers AngersPays de la LoireFrance

The rail temperature rises when the linear eddy current brake of high-speed train is working, which may lead to a change of rail physical characteristics or an effect on train operations. Therefore, a study concerning the characteristics of rail temperature rise caused by eddy current has its practical necessity. In the research, the working principle of a linear eddy current brake is introduced and its FEA model is established. According to the generation mechanism of eddy current, the theoretical formula of the internal energy which is produced by the eddy current is deduced and the thermal load on the rail is obtained. ANSYS is used to simulate the rail temperature changes under different conditions of thermal loads. The research result shows the main factors which contribute to the rising of rail temperature are the train speed, brake gap and exciting current. The rail temperature rises non-linearly with the in- crease of train speed. The rail temperature rise curve is more sensitive to the exciting current than the air gap. Moreover, the difference stimulated by temperature rising between rails of 60 kg/m and 75 kg/m is presented as well.

关键词： high-speed train linear eddy current brake thermal load rail temperature rise

空气污染、社会经济地位与居民健康不平等——基于CGSS的微观证据

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人口学刊 2019年第6期41卷 103-112页

作者：孙猛芦晓珊吉林大学东北亚研究中心吉林长春130012 长春大学党委组织部吉林长春130022

本文利用中国综合社会调查(CGSS)数据,基于Grossman健康生产函数详细考察空气污染、社会经济地位对居民健康的影响机制及城乡异质性,进一步识别空气污染与社会经济地位协同作用对居民健康不平等的分化机制。研究结果显示在中国18岁及以... 详细信息

本文利用中国综合社会调查(CGSS)数据,基于Grossman健康生产函数详细考察空气污染、社会经济地位对居民健康的影响机制及城乡异质性,进一步识别空气污染与社会经济地位协同作用对居民健康不平等的分化机制。研究结果显示在中国18岁及以上的成年人口中,社会经济地位较高的人群拥有更好的自评健康水平,这种群体健康分化主要来自社会经济地位正效应和空气污染负效应的综合影响。城乡居民之间的健康差异主要来自收入的绝对差异和偏效应差异以及社会阶层和教育水平的城乡差异。空气污染对居民健康不平等具有显著的分化机制,其作用途径是通过调整社会经济地位尤其是收入效应来实现的,这种分化机制在城市居民中表现得尤为突出。因此,相关政策的设计实施应该更加关注环境健康风险以及健康不平等的加剧:一是要加强环境规制,严控大气污染,降低居民整体暴露风险;二是要推进基本公共服务均等化,提高弱势群体应对健康风险的能力;三是要加强城乡教育培训的扶持力度,缓解收入差距和教育分化引致的健康不平等。

关键词：空气污染社会经济地位健康不平等 Logistic回归

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考虑用户体验的动态共乘系统设计

系统工程理论与实践 2020年第1期40卷 210-218页

作者：谭卫民龙建成卢晓珊郭宁合肥工业大学管理学院合肥230009 合肥工业大学汽车与交通工程学院合肥230009 工业安全与应急技术安徽省重点实验室合肥230009

动态共乘系统是一种新兴的智能出行系统,它通过实时动态地将司机和乘客进行匹配,达到有效整合路网运力资源、缓解交通拥堵和减少环境污染的目的.用户体验的优劣对动态共乘系统的可持续发展至关重要,传统的系统设计只重视运行效率,而忽... 详细信息

动态共乘系统是一种新兴的智能出行系统,它通过实时动态地将司机和乘客进行匹配,达到有效整合路网运力资源、缓解交通拥堵和减少环境污染的目的.用户体验的优劣对动态共乘系统的可持续发展至关重要,传统的系统设计只重视运行效率,而忽略了用户心理.为此,本文引入实时反馈、优先权分配以及不动匹配对移除三大机制,提出了一个新的考虑用户体验的动态共乘系统.系统的决策过程分为三个阶段:1)建立基于优先权分配的最大权重双向图匹配模型,以确定当前最优匹配方案;2)基于实时反馈机制,将匹配结果告知出行者;3)基于不动匹配对和最晚出发时刻,进行方案评估.最后,通过数值算例将提出的动态共乘系统与传统系统进行了对比.结果表明,本文提出的系统可以大幅度缩短用户的等待时间,改善用户体验,同时有效地提高系统的运行效率.

关键词：动态共乘用户体验优先权不动匹配对实时反馈

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考虑乘客异质性的公交阶梯票价策略优化

合肥工业大学学报：自然科学版 2019年第12期42卷 1709-1714页

作者：张鑫卢晓珊合肥工业大学汽车与交通工程学院

针对早高峰轨道交通拥挤问题,文章根据用户均衡准则建立了考虑计划延误成本和车内拥挤成本的均衡乘车模型,研究了异质乘客的出发时间选择行为及不同的阶梯票价优化策略,并推导出不同票价调整策略下的最优调整区间以及相应的票价调整量... 详细信息

针对早高峰轨道交通拥挤问题,文章根据用户均衡准则建立了考虑计划延误成本和车内拥挤成本的均衡乘车模型,研究了异质乘客的出发时间选择行为及不同的阶梯票价优化策略,并推导出不同票价调整策略下的最优调整区间以及相应的票价调整量。研究发现,票价区间划分得越多,系统总成本越小,乘客的出行分布越均匀。最后通过数值算例验证了模型的正确性。

关键词：轨道交通乘客异质性阶梯票价用户均衡拥挤成本

Transferrin Is Up-Regulated by Microbes and Acts as a Negative Regulator of Immunity to Induce Intestinal Immunotolerance

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Research 2024年第3期7卷 761-774页

作者： Xiaopeng Tang Mingqian Fang Ruomei Cheng Junkun Niu xiaoshan Huang Kuanhong Xu Gan Wang Yang Sun Zhiyi Liao Zhiye Zhang James Mwangi Qiumin lu Aili Wang Longbao Lv Chao Liu Yinglei Miao Ren Lai Engineering Laboratory of Peptides of Chinese Academy of Sciences Key Laboratory of Bioactive Peptides of Yunnan ProvinceKIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common DiseasesNational Resource Center for Non-Human PrimatesNational Research Facility for Phenotypic&Genetic Analysis of Model Animals(Primate Facility)and Sino-African Joint Research CenterNew Cornerstone Science InstituteKunming Institute of Zoologythe Chinese Academy of SciencesNo.17 Longxin RoadKunmingYunnan650201China School of Basic Medicine Qingdao UniversityQingdao 266071ShandongChina. Department of Gastroenterology First Affiliated Hospital of Kunming Medical UniversityYunnan Institute of Digestive DiseaseKunming 650032YunnanChina Yunnan Province Clinical Research Center for Digestive Diseases Kunming 650032YunnanChina Kunming College of Life Science University of Chinese Academy of SciencesKunming 650204YunnanChina Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences University of Science and Technology of ChinaHefei 230027AnhuiChina Center for Evolution and Conservation Biology Southern Marine Science and Engineering Guangdong LaboratoryGuangzhou 511458GuangdongChina.

Cross-talks (e.g., host-driven iron withdrawal and microbial iron uptake between host gastrointestinal tract and commensal microbes) regulate immunotolerance and intestinal homeostasis. However, underlying mechanisms that regulate the cross-talks remain poorly understood. Here, we show that bacterial products up-regulate iron-transporter transferrin and transferrin acts as an immunosuppressor by interacting with cluster of differentiation 14 (CD14) to inhibit pattern recognition receptor (PRR) signaling and induce host immunotolerance. Decreased intestinal transferrin is found in germ-free mice and human patients with ulcerative colitis, which are characterized by impaired intestinal immunotolerance. Intestinal transferrin and host immunotolerance are returned to normal when germ-free mice get normal microbial commensalism, suggesting an association between microbial commensalism, transferrin, and host immunotolerance. Mouse colitis models show that transferrin shortage impairs host’s tolerogenic responses, while its supplementation promotes immunotolerance. Designed peptide blocking transferrin–CD14 interaction inhibits immunosuppressive effects of transferrin. In monkeys with idiopathic chronic diarrhea, transferrin shows comparable or even better therapeutic effects than hydrocortisone. Our findings reveal that by up-regulating host transferrin to silence PRR signaling, commensal bacteria counteract immune activation induced by themselves to shape host immunity and contribute for intestinal tolerance.

关键词： impaired immunity tolerance