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Road traffic congestion measurement considering impacts on travelers

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Journal of Modern Transportation 2013年第1期21卷 28-39页

作者： Liang Ye Ying Hui dongyuan yang Transport Planning and Research Institute Ministry of Transport of China School of Transportation Engineering Tongji University

The article intends to find a method to quantify traffic congestion＇s impacts on travelers to help transportation planners and policy decision makers well understand congestion situations. Three new congestion indicators, including transportation environment satisfaction （TES）, travel time satisfaction （TTS）, and traffic congestion frequency and feeling （TCFF）, are defined to estimate urban traffic congestion based on travelers＇ feelings. Data of travelers＇ attitude about congestion and trip information were collected from a survey in Shanghai, China. Based on the survey data, we estimated the value of the three indi- cators. Then, the principal components analysis was used to derive a small number of linear combinations of a set of variables to estimate the whole congestion status. A linear regression model was used to find out the significant variables which impact respondents＇ feelings. Two ordered logit models were used to select significant variables of TES and TTS. Attitudinal factor variables were also used in these models. The results show that attitudinal factor variables and cluster category variables are as important as sociodemographic variables in the models. Using the three congestion indicators, the government can collect travelers＇ feeling about traffic congestion and estimate the transportation policy that might be applied to cope with traffic congestion.

关键词： Traffic congestion indicator Attitudinalfactor variable Linear regression model - Ordered logitmodel

Dwell time estimation models for bus rapid transit stations

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Journal of Modern Transportation 2012年第3期20卷 168-177页

作者： Fazhi LI Zhengyu DUAN dongyuan yang Key Laboratory of Road and Traffic Engineering of the Ministry of Education School of Transportation EngineeringTongji UniversityShanghai 201804China

Bus rapid transit （BRT） systems have been shown to have many advantages including affordability, high capacity vehicles, and reliable service. Due to these attractive advantages, many cities throughout the world are in the process of planning the construction of BRT systems. To improve the performance of BRT systems, many researchers study BRT operation and control, which include the study of dwell times at bus/BRT stations. To ensure the effectiveness of real-time control which aims to avoid bus/BRT vehicles congestion, accurate dwell time models are needed. We develop our models using data from a BRT vehicle survey conducted in Changzhou, China, where BRT lines are built along passenger corridors, and BRT stations are enclosed like light rails. This means that interactions between passengers traveling on the BRT system are more frequent than those in traditional transit system who use platform stations. We statistically analyze the BRT vehicle survey data, and based on this analysis, we are able to make the following conclusions：（ I ） The delay time per passenger at a BRT station is less than that at a non-BRT station, which implies that BRT stations are efficient in the sense that they are able to move passengers quickly. （II） The dwell time follows a logarithmic normal distribution with a mean of 2.56 and a variance of 0.53. （III） The greater the number of BRT lines serviced by a station, the longer the dwell time is. （IV） Daily travel demands are highest during the morning peak interval where the dwell time, the number of passengers boarding and alighting and the number of passengers on vehicles reach their maximum values. （V） The dwell time is highly positively correlated with the total number of passengers boarding and alighting. （VI） The delay per passenger is negatively correlated with the total number of passengers boarding and alighting. We propose two dwell time models for the BRT station. The first proposed model is a linear model while the second is n

关键词： dwell time model conflict factor bus rapid transit (BRT) station

Efficient conversion of benzene and syngas to toluene and xylene over ZnO-ZrO_(2)&H-ZSM-5 bifunctional catalysts

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Chinese Journal of Chemical Engineering 2022年第5期35卷 203-210页

作者： Xiao Zhao Xuan Shi Zhongshun Chen Long Xu Chengyi Dai Yazhou Zhang Xinwen Guo dongyuan yang Xiaoxun Ma School of Chemical Engineering Northwest UniversityXi’an 710069China International Science&Technology Cooperation Base for Clean Utilization of Hydrocarbon Resources Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei EnergyCollaborative Innovation Center for Development of Energy and Chemical Industry in Northern ShaanxiNorthwest UniversityXi’an 710069China School of Chemical Engineering Dalian University of TechnologyDalian 116024China Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China Shanxi yanchang Petroleum(Group)Corp.LtdXi’an 710000China

A series of ZnO-ZrO_(2) solid solutions with different Zn contents were synthesized by the urea coprecipitation method,which were coupled with H-ZSM-5 zeolite to form bifunctional *** a new benzene alkylation reagent,syngas was used instead of methanol to realize the efficient conversion of syngas and benzene into toluene and xylene.A suitable ratio of ZnO-ZrO_(2) led to the significant improvement in the catalytic performance,and a suitable amount of acid helped to increase the selectivity of toluene/xylene and reduce the selectivity of the by-products ethylbenzene and C^(9+) *** highest benzene conversion of 89.2%and toluene/xylene selectivity of 88.7%were achieved over 10%ZnO-ZrO_(2)&H-ZSM-5(Si/Al=23)at a pressure of 3 MPa and a temperature of 450℃.In addition,the effect of the zeolite framework structure on product distribution was *** to the molecular dynamics of aromatic hydrocarbons,H-ZSM-5 zeolites comprise 10-membered-ring pores,which are beneficial to the activation of benzene;hence,the conversion of benzene is higher.H-ZSM-35 and HMOR zeolites exhibited small eight-membered-ring channels,which were not conducive to the passage of benzene;hence,the by-product ethylbenzene exhibits a higher *** distance between the active centers of the bifunctional catalysts was the main factor affecting the catalytic performance,and the powder mixing method was more conducive to the conversion of syngas and benzene.

关键词： ZnO-ZrO_(2) Bifunctional catalysts Aromatics Alkylation of benzene Syngas

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2010年上海世博会物流规划研究

同济大学学报（自然科学版） 2006年第8期34卷 1050-1054页

作者：杨扬杨东援同济大学交通运输工程学院

从世博客流的需求预测入手,在分析上海市物流现状的基础上,指出上海市政府及早制订并实施世博物流专项规划的必要性.进一步,通过分析2010年世博物流的特点及上海市的物流发展环境,对世博物流规划进行了概念界定,提出世博物流规划的具体... 详细信息

从世博客流的需求预测入手,在分析上海市物流现状的基础上,指出上海市政府及早制订并实施世博物流专项规划的必要性.进一步,通过分析2010年世博物流的特点及上海市的物流发展环境,对世博物流规划进行了概念界定,提出世博物流规划的具体目标,并指出规划应包含的主要内容.

关键词：上海世博物流物流管理系统物流规划

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基于快慢车组合的城市轨交走廊客流分析模型

同济大学学报（自然科学版） 2014年第1期42卷 78-83页

作者：狄迪杨东援同济大学交通运输工程学院上海201804

构建的客流分析模型由三部分组成,首先在随机用户均衡分配理论的基础上建立乘客路径选择模型,确定乘客选择路径的原则和客流分配的基本依据;其次,以轨道行程时间、车内拥挤度及平均候车时间作为影响乘客出行成本的主要因素建立乘客出行... 详细信息

构建的客流分析模型由三部分组成,首先在随机用户均衡分配理论的基础上建立乘客路径选择模型,确定乘客选择路径的原则和客流分配的基本依据;其次,以轨道行程时间、车内拥挤度及平均候车时间作为影响乘客出行成本的主要因素建立乘客出行成本模型;再次,通过建立弹性需求模型,考虑乘客出行意愿与服务水平的相互影响.最后运用案例,对客流分析模型进行验证,并得出快慢线组合运营对轨道交通走廊运营效率的影响效用及相关结论.

关键词：快慢车组合运营城市轨道交通走廊客流分析弹性需求

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电子商务物流配送仿真系统的面向对象开发

同济大学学报（自然科学版） 2006年第8期34卷 1045-1049页

作者：杨俊琴杨东援同济大学交通运输工程学院上海200092

在对B2C(business to customer)电子商务物流配送系统的特殊性以及该系统仿真的目的与内容进行分析的基础上,应用面向对象软件开发思想,对B2C电子商务物流配送系统进行了实体分析,由此确定了电子商务物流配送仿真系统的主要对象类.介绍... 详细信息

在对B2C(business to customer)电子商务物流配送系统的特殊性以及该系统仿真的目的与内容进行分析的基础上,应用面向对象软件开发思想,对B2C电子商务物流配送系统进行了实体分析,由此确定了电子商务物流配送仿真系统的主要对象类.介绍了对象建模工作,提出反映对象之间静态关系的静态对象模型以及反映系统运转机制和控制结构的动态对象模型.最后,根据对象建模的结果,进行了详细的对象设计,确定了各主要对象的属性与功能.

关键词： B2C电子商务配送系统仿真面向对象对象分析对象建模对象设计

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基于多区域人群的上海公交走廊出行行为

同济大学学报（自然科学版） 2016年第3期44卷 369-376页

作者：狄迪杨东援同济大学交通运输工程学院上海201804

基于上海市公共交通走廊内的乘客出行调查,利用离散选择理论,建立了现状调查/假设意愿调查(RP/SP)融合数据的Nested Logit模型.通过模型参数标定、敏感性分析从定性、定量两个角度研究了在城市公交走廊内,来自不同区域的出行者对于公共... 详细信息

基于上海市公共交通走廊内的乘客出行调查,利用离散选择理论,建立了现状调查/假设意愿调查(RP/SP)融合数据的Nested Logit模型.通过模型参数标定、敏感性分析从定性、定量两个角度研究了在城市公交走廊内,来自不同区域的出行者对于公共交通方式的出行行为及影响因素;在此基础上,分析了模型在不同空间范围内的转移适用性;最后,通过算例进行分析和验证.通过研究可知,在城市公交走廊内,影响出行者选择行为的因素不尽相同,其区域差异性不容忽视;其次,不同区域的出行者对于各公交方式的偏好存在较大差异;再次,不同区域的出行者在走廊内选择交通方式时,对于同一影响因素的敏感性有所不同.从数据获取、模型建立、标定分析及仿真验证四个步骤逐次展开,提出了针对不同区域出行者在城市公交走廊选择行为的基本方法和必要性,对未来城市公共交通走廊的规划和改进提供新的思路和方向.

关键词：多区域人群公交走廊出行行为现状调查/假设意愿调查(RP/SP)数据融合 Nested Logit模型

Port Facilities GIS Application and Development of Port Facilities

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International Journal of Technology Management 2015年第2期 111-112页

作者： dongyuan yang DongFang SHANG Kai yang LiYing KOU Tianjin Research Institute for Water Transport Engineering M.O.T Tianjin 300456China

In connection with the port facilities spatial distribution feature and volume of relevant attributes, applying of GIS technology and computer technology to build an application system to administrate port facilities, makes it convenient for port facilities administrator to know well of port facilities location and execute management. In this paper, the application and development of GIS to port facilities is studied. The main idea to understand the system design, the frame structure and its technical structure; and to demonstrate facilities information data processing＆ management and system function by connection with development instance. The construction of the system will enable the port facilities GIS become daily management tools and play an important role to improve efficiency, and promote the intelligent and convenient managemen^t of port facilities.

关键词： Port Facilities G1S Data Management

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城市公共交通走廊动态客流分析模型

同济大学学报（自然科学版） 2014年第10期42卷 1523-1529页

作者：狄迪杨东援同济大学交通运输工程学院上海201804

为了科学分析和评价城市公共交通走廊的客流流动规律,研究了走廊内乘客对于出发时刻及交通方式选择的问题,提出了城市公共交通走廊动态客流分析模型.模型主要由乘客出发时刻和交通方式选择组合动态均衡分配模型,以及乘客出行负效用模型... 详细信息

为了科学分析和评价城市公共交通走廊的客流流动规律,研究了走廊内乘客对于出发时刻及交通方式选择的问题,提出了城市公共交通走廊动态客流分析模型.模型主要由乘客出发时刻和交通方式选择组合动态均衡分配模型,以及乘客出行负效用模型两部分构成.在此基础上,设计了一套启发式算法求解该模型;并以上海市的跨江公共交通走廊为案例,验证所提出的模型和求解算法.研究结果表明,该模型能够真实反映城市公共交通走廊内客流的时空分布情况,以及行程时间、拥挤度及出行费用等因素对乘客出行选择的影响.所提出的模型可为城市公交走廊内各公共交通方式的合理搭配、运输组织模式优化提供决策支持.

关键词：城市公交走廊动态客流分布出发时刻选择交通方式选择