A theoretical foundation for the relationship between generalized origin–destination matrix and flow matrix based on ordinal graph trajectories

This paper shows the relationship between flow, generalized origin–destination (OD), and alternative route flow from a set of ordinal graph trajectories. In contrast to traffic assignment methods that employ OD matrix to produce flow matrix, we use ordinal trajectory on a network graph as input and produce both the generalized OD matrix and the flow matrix, with the alternative and substitute route flow matrices as additional outputs. By using linear algebra‐like operations on matrix sets, the relationship between network utilization (in terms of flow, generalized OD, alternative route flow, and desire line) and network structure (in terms of distance matrix and adjacency matrix) are derived. Copyright © 2012 John Wiley & Sons, Ltd.     

浅析铁路专用线卸车方式对车站布置的影响

以连云港某专用线装卸车站为例,阐述了铁路专用线装卸方式与车站布置之间的相互关系,对各种装卸机械作业条件下的运输组织和车站布置进行了分析,得出合理的配置组合,为专用线装卸车站的布置提供参考.     

Evolution of latent modal captivity and mode choice patterns for commuting trips: A longitudinal analysis using repeated cross-sectional datasets

This paper presents an investigation of the temporal evolution of commuting mode choice preference structures. It contributes to two specific modelling issues: latent modal captivity and working with multiple repeated crossectional datasets. In this paper latent modal captivity refers to captive reliance on a specific mode rather than all feasible modes. Three household travel survey datasets collected in the Greater Toronto and Hamilton Area (GTHA) over a ten-year time period are used for empirical modelling. Datasets collected in different years are pooled and separate year-specific scale parameters and coefficients of key variables are estimated for different years. The empirical model clearly explains that there have been significant changes in latent modal captivity and the mode choice preference structures for commuting in the GTHA. Changes have occurred in the unexplained component of latent captivities, in transportation cost perceptions, and in the scales of commuting mode choice preferences. The empirical model also demonstrates that pooling multiple repeated cross-sectional datasets is an efficient way of capturing behavioural changes over time. Application of the proposed mode choice model for practical policy analysis and forecasting will ensure accurate forecasting and an enhanced understanding of policy impacts.     

抽象广义双拟变分不等式的推广

笔者研究了文 [1]、[2 ]中引入的抽象广义双拟变分不等式解的存在性问题 .我们的结果统一、改进和发展了有关变分不等式问题的许多最新结果 .     

论如何提高水泥混凝土路面滑模摊铺平整度技术指标

采用大型、先进的滑模摊铺技术能提高水泥混凝土路面的整体质量,确保水泥混凝土路面的平整、密实以及行车舒适性。基于实践经验,就如何提高水泥混凝土路面滑模摊铺施工中平整度指标提出几点建议,以供参考。     

填方路基不均匀沉降模式及其成因机制

在山区和多丘陵地区多采用挖方土石混合料填筑路基,并且形成高路堤。因此在路基的自重荷载和行车荷载共同作用下,经常出现路基的整体下沉或部分下沉,特别是一些填挖接头和桥台处,路基不均匀沉降特别突出。经过大量的实际调查以及实验,归纳起来填方路基的不均匀沉降主要有四种基本模式:路基填方压实度不足;地基中存在软弱土层;路基刚度差异过大;填充物成分不均匀。     

养护施工总承包模式下业主与承包商的博弈分析

文章以博弈论为理论基础,分析了养护施工总承包模式下业主与总承包商的博弈关系,提出了引导双方采用合理的策略以获得最大利益及保证工程产品达到较高质量水平的博弈对策,为养护施工总承包工程的管理和施工提供方法借鉴。     

城市轨道交通系统票种设置及票务规则研究

轨道交通系统目前已经在许多城市形成了线网结构,在运营范围扩大的同时也增加了票务管理的难度。系统投资高、回收期长的特点决定了轨道交通系统必须设置具有吸引力的票种和探讨线网条件下的票务规则。在根据系统客流时空特性的基础上,设置了单程类和储值类2大类13种轨道交通车票,并根据系统运营的实际情况把轨道交通运营状态分成正常、降级和紧急3大类工作模式,探讨了不同工作模式下各类车票的票务规则,有利于提高轨道交通系统的经济和社会效益。     

基于电子商务农产品物流组织模式实施的保障措施

发展农产品物流是一项复杂的系统工程,涉及面广,制约因素多。针对中国农产品物流发展存在着的成本偏高、效率较低、社会化和市场化程度低、物流设施和技术落后、人才缺乏、信息不畅等问题,根据我国农产品物流组织模式的发展趋势和农产品市场供求状况,提出电子商务环境下农产品物流组织模式实施的保障措施,可为加快我国农产品物流发展提供一定的理论指导和决策参考。     

乘性O—U噪声驱动下基因选择模型的定态性质

从乘性O—U噪声驱动下的基因选择模型出发,讨论了O—U噪声参数对模型定态性质的影响。数值计算结果表明O-U噪声的噪声强度比噪声关联时间对基因单倍体定态几率分布有更大影响,噪声的有色性有利于分离不同基因的单倍体。