论公路隧道提质升级

与欧洲和日本等发达国家相比，我国公路隧道工程品质亟待提升。从国家战略、行业需求和人民需要3个维度分析开展公路隧道提质升级行动的时代背景，从8个方面解读其深刻内涵，并详尽阐述公路隧道提质升级的总体思路和技术要点。强调应关注的重点区域是隧道洞口、洞身和路面，最需要补齐的短板是通风、照明、消防、逃生疏散、交通安全设施以及智能化管养平台，并提出“设施是基础、安全是根本、养护是关键、管控是核心、预案是保障、品质是追求”，建议大力推进公路隧道建设、管理、养护、运营、安全、服务协调发展，打造安全、绿色、智能的公路隧道，助力我国由“公路隧道大国”迈向“公路隧道强国”。     

140客位沿海单体高速客船

阐述了１４０客位沿海单体高速客船的主要要素,主要技术性能,型线特征,结构特点,总布置等,并论述了本船设计特点。     

关于天津港泥沙回淤程度的评价

关于港口泥沙回淤程度的评价指标与标准,国内、外目前尚无专著文献.依据天津港多年的有关资料,采用“挖泥吞吐比”、“淤强水深比”两个指标,提出了港口泥沙回淤程度的分类标准,并对天津港总体和分区的回淤程度进行了评定.     

编制国省道改建项目可研报告的几点心得体会

通过对近年来山东省国省道改建可研报告编制工作中常见问题及设计对策的总结,用工作实例提出了解决问题的思路和方法。     

Multi-step prediction of experienced travel times using agent-based modeling

This paper develops an agent-based modeling approach to predict multi-step ahead experienced travel times using real-time and historical spatiotemporal traffic data. At the microscopic level, each agent represents an expert in a decision-making system. Each expert predicts the travel time for each time interval according to experiences from a historical dataset. A set of agent interactions is developed to preserve agents that correspond to traffic patterns similar to the real-time measurements and replace invalid agents or agents associated with negligible weights with new agents. Consequently, the aggregation of each agent’s recommendation (predicted travel time with associated weight) provides a macroscopic level of output, namely the predicted travel time distribution. Probe vehicle data from a 95-mile freeway stretch along I-64 and I-264 are used to test different predictors. The results show that the agent-based modeling approach produces the least prediction error compared to other state-of-the-practice and state-of-the-art methods (instantaneous travel time, historical average and k-nearest neighbor), and maintains less than a 9% prediction error for trip departures up to 60 min into the future for a two-hour trip. Moreover, the confidence boundaries of the predicted travel times demonstrate that the proposed approach also provides high accuracy in predicting travel time confidence intervals. Finally, the proposed approach does not require offline training thus making it easily transferable to other locations and the fast algorithm computation allows the proposed approach to be implemented in real-time applications in Traffic Management Centers.     

Emergence of cooperation in congested road networks using ICT and future and emerging technologies: A game-based review

Information and communications technologies (ICT) and future and emerging technologies (FET) are expected to revolutionize transportation in the next generation. Travelers’ behavioral adaptation is a key to their success. We discuss the notion of managing traffic congestion by enhancing cooperation in road networks enabled with ICT and FET. Cooperation is an emergent social state related to the dynamics and complexity of road traffic and reinforced learning. Game theory and research in behavioral economics show that cooperation can be leveraged to efficiently solve social dilemmas similar to traffic congestion. We review the applicability of behavioral economics and game theory concepts to route, mode and departure time choice problems. Beyond advancing theory, research on cooperation in the context of transportation is still in its infancy. We discuss state-of-the-art methodologies and their weaknesses and review the unexplored opportunities inherent in game-based methodologies. A behavioral-technological research agenda for FET is also discussed.     

高校财务内部控制要素分析

本文针对高校办学经费来湃由财政拨款方式向多渠道筹措办学资金的方式转变,管理业务日趋复杂,本文从控制环境、风险评估、控制活动、沟通与交流、监控等五个方面对高校内部控制要素进行分析,构建五个方面要素模型,实现对高校内部有效控制.     

Estimating travel time functions for urban roads: options and issues

Travel time functions specify the relationship between the travel time on a road and the volume of traffic on the road. Until recently, the parameters of travel time functions were rarely estimated in practice; however, a compelling case can be made for the empirical examination of these functions. This paper reviews, and qualitatively evaluates, a range of options for developing a set of travel time functions. A hierarchy of travel time functions is defined based on four levels of network detail: area, corridor, route and link. This hierarchy is illustrated by considering the development of travel time functions for Adelaide. Alternative sources of data for estimating travel time functions are identified.

In general, the costs and benefits increase as the travel time functions are estimated at finer levels of network detail. The costs of developing travel time functions include data acquisition costs and analysis costs. The benefits include the potential for reducing prediction errors, the degree of application flexibility and the policy sensitivity of the travel time functions.     

中小城市公交场站用地指标研究

国内目前针对中小城市公交场站的研究不足,中小城市场站建设缺乏科学指导,场站用地难以得到保障.结合中小城市公交发展特点及场站模式,通过科学的分析计算,确定场站停车坪、建筑用地、场前区及绿化用地规模,探讨与之相符的中小城市公交场站用地指标,对于中小城市场站规划建设具有一定的现实意义.