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通过海上过驳转运系统实现散货运输可有效降低港口及航道建设成本。海上过驳转运系统运行受过驳作业能力、航道条件、转运船数量、转运船航行及避让等因素影响,无法仅通过规范公式测算确定转运船合理数量。结合实际工程案例,分析过驳转运系统的生产作业流程,建立过驳转运系统仿真模型并模拟其作业过程,对转运船的配置规模进行敏感性研究。结果表明,随着转运船数量增加,每艘船的平均等待时间增加,平均作业时间减少。此外,以满足运量需求为基础,确定了不同时期转运船的最少配置数量。系统仿真分析方法可为过驳转运系统的设计和后续运营提供支撑。 相似文献
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在\"一带一路\"倡议指引下,中国企业加快了全球码头投资步伐,为全球港口行业发展贡献了\"中国方案\"。但国际码头投资是高度市场化和相对充分竞争的领域,海外码头投资是一项复杂的系统工程,投资风险不容低估。以\"把控风险、价值投资\"为导向,总结我国企业海外码头投资的经验教训,按照系统性、典型性、可操作性和综合性原则,从营商环境、市场潜力、竞争形势、国别价值和投资主体优势5个维度,构建海外码头投资布局决策指标体系,分3个层级共23个核心指标,建立基于AHP(层次分析法)的海外码头投资布局决策模型,以期为我国企业投资布局海外码头提供决策参考。 相似文献
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不定期船航次的AHP决策研究 总被引:1,自引:0,他引:1
指出现有不定期船航次决策中存在的问题,分析其主要影响因素,介绍AHP法的原理及其步骤。依此建立了不定期船航次决策的层次结构,并构造了符合一致性标准的判断矩阵,从而作出不定期船航次的AHP决策。实例证明结果可靠,符合实际。 相似文献
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The purpose of this article is to evaluate the service requirements of dedicated container terminals (DCTs). In this article, the service attributes (SAs) of DCTs were first discussed. A fuzzy analytic hierarchy process model was then constructed to measure the users’ perceived importance and dissatisfaction for each of the SAs. Based on these two measurements, a revised importance-performance analysis model was proposed to identify the SAs that should be improved. To validate the model, the dedicated container terminal of Evergreen Marine Corp. (EMC DCT) at Kaohsiung Port and its users were empirically investigated. With respect to the empirical results, managerial implications of the findings in improving service quality for the EMC DCT are discussed. 相似文献
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Major accidental oil spills still affect ecologically and economically sensitive marine areas and shorelines, even though environmental programs and policies have led to an increase of ship safety measures. The aim of decision making during oil spill response management is to minimize pollution effects on coastal areas, once spills occur. However, limited equipments or options prevent such a globally satisfying combat strategy. Thus, often preferences between different coastal areas or uses, respectively, have to be made in an operational way. Such a management issue is here taken as a multigroup multicriteria decision-making problem involving a variety of stakeholders and natural dynamic environments. For solving such a complex problem, this article proposes a second order fuzzy comprehensive evaluation (FCE) model, which takes the influence of multiple criteria and the knowledge of different interested groups into account and further provides a basis for simulating a voting-based decision process. With the combination of oil fate simulations and FCE technique, managers are able to realize an integrated management for oil spill. Through a case study of the Prestige accident off the Spanish coast in 2002, it is demonstrated that the model provides a simple, effective and adaptable method to solve operational management problems related to complex human nature interactions as realized during oil spill management. Moreover, a series of analyses and comparisons are focused on to explore potentials and limitations of the FCE for further applications in the field of multigroup multicriteria decision making. 相似文献
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针对船舶选定型决策工作中常见的决策信息不完全、指标间相关性与权重确定、决策数据处理合成等问题,提出一种基于层次分析与证据理论的决策方法.该方法按照层次分析法原理确定决策模型结构并计算指标权重,利用分级排序表处理指标相关性,同时按照证据理论原理将决策评价等级转化为同一信度框架内的信度分配,用D-S公式进行合成,最终获得对对象船舶的效用排序.将该方法结论与基于灰色关联理论的船舶选定型决策方法结论进行比较分析,说明其有效性. 相似文献
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Alba Martínez-López Alicia Munín-Doce Lorena García-Alonso 《Maritime Policy and Management》2013,40(6):608-631
Despite European Union (EU) political support to identify the most feasible Motorways of the Sea, the final decision can only be made by Private Shipping Companies, which are operators of a unique stretch of the intermodal chain. This paper provides a multi-criteria decision method to identify the most suitable Motorways of the Sea taking into account the competitiveness of whole intermodal routes versus the alternative of road transport from the loader’s perspective. The analysis is carried out assuming a ‘many-to-many’ transport model. Firstly indexes of time and cost were defined and evaluated for every available route in the model in accordance with a multi-criteria decision matrix. Secondly, through a Monte Carlo simulation a sensitivity analysis was carried out in order to evaluate the influence on the results of the forecast assumed to construct the matrix. The results obtained are not only quantitative, but also qualitative. The development of intermodal routes via Motorways of the Sea is especially relevant for the peripheral EU countries. Due to the relevance of the freight flow between France and Spain and the congestion of their connections through the Pyrenees, the method proposed was applied to the analysis of this particular case 相似文献
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根据层次分析法的步骤,依次确定了目标层、准则层和方案层,建立了舰炮武器系统总体方案决策层次图,并应用专家评估的方法对准则层一的4个指标、准则层二的3个指标和准则层三的15个指标进行了打分。最后结合某大口径双管舰炮、俄大口径双管舰炮和新大口径单管舰炮的各性能参数指标,运用层次分析法计算出了三种大口径舰炮作战性能比和总体作战性能比,结果分析表明新大口径单管舰炮优于另外两种大口径舰炮。 相似文献
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高桩码头沉桩完毕后的偏差测定,是设计复核和工程质量等级核定的必要依据。通过对常规测量和结合三维CAD测量2种方法的详细阐述,结合具体工程的实际运用,得出结合三维CAD的测量方法优于常规测量方法的结论,并提出应用建议。 相似文献
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基于SOPC技术的嵌入式以太网网络终端 总被引:3,自引:1,他引:3
采用SOPC技术把处理器内核配置到FPGA芯片中,是一种具有特殊优势的嵌入式系统解决方案。在嵌入式以太网网络终端的研制中,应用Quartus Ⅱ软件平台的SOPC Builder设计工具,把Nios软核处理器,以太网芯片控制电路,其它外围器件的控制电路及用户逻辑电路都集成在了一片Cyclone可编程逻辑芯片上,在这个网络终端上运行μC/OSⅡ嵌入式操作系统,1wIP网络通信协议和应用软件,就能实现多种网络通信功能。 相似文献
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构建基于信息系统的炮兵作战体系是炮兵适应信息化条件下作战,形成体系作战能力的必然要求。文章从基于信息系统的炮兵作战体系的概念入手,针对信息化战场对炮兵作战的影响,深刻分析了基于信息系统的炮兵作战体系能力要求,并在此基础上提出了指挥控制、通信、侦察情报、火力打击、电子对抗、敌我识别、密码保密等七大要素构成基于信息系统的炮兵作战体系。 相似文献
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多目标、多准则决策问题中,决策结果的准确性与属性权重的合理性和评价系统的可行度密切相关。分析了主观赋权法、客观赋权法的优缺点, 提出了基于优化的组合赋权方法。该方法应用序列二次优化方法求解组合权向量,使最终的组合权向量与专家统计评分法、层次分析法、信息熵法、变异系数法这四种单一的主客观赋权方法相似度最高。将这种组合赋权方式与模糊综合评价法结合应用于秦皇岛至温州电厂航线散装运煤船方案决策分析,并与灰色关联评价法结果比较,决策结果证明该综合方法能合理、客观的给出排序方案,同时也能推广应用于船舶与海洋工程决策的相关领域。 相似文献
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基于区域模糊直方图的图像检索 总被引:2,自引:0,他引:2
将图像分割算法和模糊理论相结合,提出了基于区域模糊直方图的图像检索方法。用快速聚类算法对图像进行区域分块,以各区域的视觉特征为基础,建立图像模糊直方图并进行图像检索。在1000幅通用图像库上的实验表明,该方法可以得到比较满意的检索结果。 相似文献