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21.
为了优化资源,降低物流成本,提高物流运输可靠度和速度,需要建立恰当的西南公路出海(辅助)通道的物流运作模式,以充分发挥出西南公路出海(辅助)通道基础建设的效益. 相似文献
22.
Historic vehicles (HVs) are the heritage of road transport that have surprisingly received little attention in the academic literature. This study presents an overview of the literature on HVs, focusing on the three topics that dominate the policy debate on transport: environmental, safety and congestion impacts. We observed that polluting emissions of HVs are per kilometre much higher (often a factor 5 or more) than those of moderns vehicles. The annual average mileage per vehicle per year of HVs is much lower than other vehicles. The lower active and passive safety levels of HVs are compensated by the way these vehicles are driven, resulting in the risk factors per kilometre being roughly equal or lower than other vehicles. The contribution of HVs to congestion is negligible. However, the transport policy discourse is divided on the topic of HVs. More comprehensive and effective laws and regulation are needed to protect this aspect of the heritage of road transport whilst concurrently avoiding or limiting the problems caused by them. 相似文献
23.
为了保证贮存系统的可用性,需要对其故障与否进行检测,针对该问题提出了包含定期检查和预先更换的维修策略。为了协调部件更换和备件供应,联合考虑了连续检查的(0,1)订货策略,所以联合维修策略包括维修策略和备件供应策略。基于联合策略建立了一个规划模型,在满足可用度约束条件下最小化平均总费用。基于更新过程,推导了贮存系统服从一般寿命分布的性能指标。以威布尔寿命分布为例,结果表明联合策略比独立策略更有效。 相似文献
24.
在我国有公路桥的城市很多,为此制定相应的基于系统最优的公路桥收费策略,不仅可以方便居民的正常出行,还有助于政府利用桥梁收费达到城市交通平衡和解决市政桥梁建设资金问题的双重目的。 相似文献
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分析公路经营企业中财务管理通过筹资决策、投资决策和股利决策来提高报酬率、降低风险、实现企业发展目标的策略。 相似文献
27.
结合我国国情,客运专线拟采用多种速度动车组混合运行的运输组织模式,通过分析客运专线运输市场需求价格弹性,探讨了按淡、旺季对客运专线分市场来实施差别价格策略的合理性与可行性。通过分析表明,在一定条件下实施季节性差别定价法能增加客运专线运营企业利润,提高经济效益。 相似文献
28.
Chen Chen 《Maritime Policy and Management》2018,45(7):944-961
Ports and cities are intrinsically linked. Port city, which serves as a link between the local and global economy, is an integration of both urban and port systems. Constrained by different regional structures, port cities have developed various formulations over time. Using a two-stage data envelopment analysis (DEA) approach, this paper proposes a new method for measuring the sustainable development of different port city systems. While the previous empirical studies often separate the port system and the urban system, this paper assesses the two systems in an integrated way. Moreover, this paper develops a systematic methodology for measurement of sustainability. Twenty world-leading container port cities are selected for this study using contemporary data. The DEA results display their relative differences in levels of sustainable development, which reveal the effectiveness of the prevailing policies in them. Eventually, recommendations are drawn for other port cities by referring to the best practices. 相似文献
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This paper extends the work on Pareto-improving hybrid rationing and pricing policy for general road networks by considering heterogeneous users with different values of time. Mathematical programming models are proposed to find a multiclass Pareto-improving pure road space rationing scheme (MPI-PR) and multiclass hybrid rationing and pricing schemes (MHPI and MHPI-S). A numerical example with a multimodal network is provided for comparing both the efficiency and equity of the three proposed policies. We discover that MHPI-S can achieve the largest reduction in total system delay, MHPI can induce the least spatial inequity and MHPI-S is a progressive policy which is appealing to policy makers. Furthermore, numerical results reveal that different classes of users react differently to the same hybrid policies and multiclass Pareto-improving hybrid schemes yield less delay reduction when compared to their single-class counterparts. 相似文献