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付立民 《铁路通信信号工程技术》2009,6(5):33-35
介绍了温福客运专线的项目情况,重点阐述该项目的通信信号系统集成技术方案。其中信号系统包括运输调度指挥、列车运行控制和车站联锁等;通信系统则包括传输、电话交换及接入、数据网、专用移动通信和调度通信等。 相似文献
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新近沉积地层往往表层有一"硬壳",下卧层软弱,在进行建筑物基础设计时,充分利用上层"硬壳"作为持力层,采用浅埋扩大基础处理,较粉体搅喷桩、预制打入桩等措施能节约大量费用。 相似文献
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A GIS‐based method to identify cost‐effective routes for rural deviated fixed route transit 下载免费PDF全文
Hongtai Yang Christopher R. Cherry Russell Zaretzki Megan S. Ryerson Xiaobo Liu Zhijian Fu 《先进运输杂志》2016,50(8):1770-1784
Deviated fixed route transit (DFRT) service connecting rural and urban areas is a growing transportation mode in the USA. Little research has been done to develop frameworks for route design. A methodology to explore the most cost‐effective DFRT route is presented in this paper. The inputs include potential DFRT demand distribution and a road network. A heuristic is used to build possible routes by starting at urban cores and extending in all network directions in certain length increments. All the DFRT routes falling in the length range desired by the users are selected. The cost effectiveness of those routes, defined by operating cost per passenger trip, is compared. The most cost‐effective route is selected and presented in a GIS map. A case study illustrates the methodology in several Tennessee metropolitan regions. The most cost‐effective route length is case specific; some routes (e.g. those out of our Nashville case) are most cost effective when short, while others (e.g. those out of Memphis) are most cost effective when long. Government agencies could use the method to identify routes with the lowest operating cost per passenger given a route length or an operating cost budget. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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A three-stage approach, i.e., factor-cluster-multi-group Structural Equation Modeling (SEM), is designed to explore the commonalities and diversities with respect to relationships between socio-demographic characteristics and time-use patterns across different segments. Factor-cluster analysis is conducted to extract meaningful factors from attitudinal statements, and then group the sample population into three segments, each with a unique combination of mode preferences for public transit, private car, and motorcycle. By virtue of multi-group SEM, the relationships between socio-demographics and time allocated to activities and travel are found to be significantly different across segments. This study highlights the importance of latent psychological factors in segmentation. For policy implication, specific population with unique psychological features must be targeted in order to efficiently and effectively design and implement transport measures. 相似文献
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