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71.
《智能交通系统杂志
》2012,16(1):13-34
》2012,16(1):13-34
Intelligent vehicle-highway systems (IVHS) have the potential to manage non-recurring congestion due to incidents and recurring congestion due to capacity shortfall more effectively than current operational systems. IVHS will provide information to the traveler, both in the vehicle and at home, business, and at commercial and recreational facilities, to help in the selection of more optimal travel modes and routes. The collected data can also be used to build a historical base and support required statistical reporting to appropriate agencies. The process of designing and evaluating an architecture that supports IVHS begins by obtaining and understanding requirements. These are usually obtained from the customer (who can be a local, state, or federal transportation agency or a private sector company or individual), or from a combination of customers, users, service providers, and others who are affected in a major way by the architecture. Scenarios, defining the conditions and constraints under which the IVHS architecture operates, are used with models to assess the benefits of candidate solutions for performance and life-cycle cost. Some measures of merit (MoMs), such as “average time to clear an incident” or “average vehicle speed at rush hour,” are selected to provide quantitative measures and comparisons of the benefits from alternative architectures. Others, such as evaluation of institutional, political, and risk issues, are qualitative in nature. MoMs should encompass the entire spectrum of requirements and major characteristics desired of the architecture. Additional factors used to help assess architecture performance and eventual acceptability are the results of demonstration programs that evaluate specific components of an architecture. The approach with the greatest benefit-to-cost ratio that does not conflict with the constraints derived from the qualitative assessment factors is generally selected for implementation. 相似文献
72.
结合临长高速公路平江连接线改造工程,介绍了就地冷再生的施工技术原理和施工工艺,并分析了水泥含量对基层强度的影响,最后还对经济效益进行了简单分析。结果表明,就地冷再生是一种非常适宜的道路翻修改建方式。 相似文献
73.
This paper establishes and tests the perceived value model, which is applied to identify the factors affecting the passengers' repurchase intentions on city bus. In this study, perceived value is a trade-off between perceived benefits and perceived costs. And the main part of perceived benefits is service quality. We (1) measured service quality using a multiple-items scale, (2) integrated perceived non-monetary price as a part of perceived costs, and (3) simultaneously incorporated the attractiveness of alternative modes. Data was collected via a questionnaire survey in the Taipei metropolitan area and the model was tested using path analysis performed by LISREL. The results indicate that all causal relationships are statistical significant. Finally, this study concludes by discussing managerial implications and making suggestions for future research. 相似文献
74.
75.
以金华至台州铁路为背景,针对其速度目标值研究,认为应根据该铁路在路网中的功能定位、客流构成特点、时间目标值要求及与相邻路网速度目标值的匹配情况等因素,提出可能的速度目标值方案,而后分析不同速度目标值方案对工程投资、运营成本及铁路技术装备等的影响,以综合效益最大化为目标,选择研究年度最优速度目标值.最后,对推荐的速度目标值方案与路网、铁路技术发展等进行适应性分析,得出速度目标值的研究结论. 相似文献
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77.
文中结合风光互补能源系统原理,从我国东海海区航标管理及维护实践出发,就风光互补能源系统在沿海航标上推广和应用的必要性及可能性进行了探讨。 相似文献
78.
通过对郑州机务段客运电力机车轴箱轴承的设计疲劳寿命计算以及对机务段多年轴承检测情况进行统计分析,提出了合理延长此类轴承使用周期的建议,以避免因此类轴承使用寿命期规定过短造成的过剩维修,达到节约大量材料和资金的目的。 相似文献
79.
In this article we attempt to illustrate the potential benefits to Alaskan commercial fisheries expected from enhancements to the Alaska Ocean Observing System (AOOS) through changes in fishery management strategies. In particular we show how the use of improved AOOS data in research, stock assessment, and ultimately fisheries management has the potential to result in significant benefits in the Bering Sea and Gulf of Alaska groundfish and Kodiak king crab fisheries. We show through a case study approach that information such as might be provided by an enhanced AOOS could conceivably contribute over $600 million in additional annual revenue in Alaska's groundfish fishery. In addition we estimate that had the information from such a system been available in the 1970s and 1980s the Kodiak king crab stock collapse could have been avoided and $60 million in annual revenues generated. Benefit estimates (as measured by revenue increases) are based on the assumptions that when better data is delivered those data will be integrated into stock assessment models; when better data are integrated into the models the new data will actually improve the reliability of the models; and when the reliability of the models is improved predictions will be accepted by managers or industry members. 相似文献
80.
针对FPSO吊车回转行星减速箱第一级存在较高故障率的问题,从回转行星减速箱的设计和原理入手,分析故障的主要原因是内部传动滚针的散落和行星轮润滑失效。把改变行星轮传动机构和改善行星轮润滑条件作为两个方面对减速箱第一级进行升级改造,改造后减少了回转齿轮箱故障率,减少了吊机停机维护时间。 相似文献