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嵌入式全关系系统CR-Foxpro基本运算的实现 被引量:2
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作者 张正玺 焦占亚 焦沛 《陕西科技大学学报(自然科学版)》 2003年第5期70-73,共4页
叙述了在作者开发的嵌入式全关系系统CR-Foxpro(Complete Relation-Foxpro)中关系代数基本运算操作命令的实现,并且使用作者提出的关系除法运算的基本运算表达公式实现了除法操作。
关键词 嵌入式全关系系统 CR—Foxpro 关系代数 除法运算 运算公
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Freight Transport Using Short Sea Shipping
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作者 Xavier Ametller 《Journal of Shipping and Ocean Engineering》 2015年第3期143-150,共8页
The increasing imbalance between road and maritime transport has led to saturation of the terrestrial infrastructures. For this reason, the development and analysis of an intermodal freight transport which is safe, re... The increasing imbalance between road and maritime transport has led to saturation of the terrestrial infrastructures. For this reason, the development and analysis of an intermodal freight transport which is safe, reliable and sustainable is the first step to a more balanced growth of other transport options. In this sense, SSS (Short Sea Shipping) rises like a real and efficient alternative to the land road-based transport as well as integrated to a multimodal system door to door for the freight distribution. This paper aims to evaluate and identify all those parameters required to determine the characteristics ofa SSS service under a theoretical approach. The increasing growth of the transport market demands to the maritime transport an adaptation effort to the redistribution space processes of production centers and consumption and, as a result of it, of the logistic flows and transport. For this reason, a specific methodology has been developed to model all those phases integrated in the logistic chain of SSS. The final purpose is to determine costs and time of each one of them, for its later implementation in a heuristic algorithm of routing analysis. The main driving factors that determine under which conditions the SSS represents an effective and a feasible solution to road freight are also identified. Information regarding European Union programs to promote the SSS is also presented for a better understanding of the ways of funding sustainable freight transport projects. This investigation states an initial basis for evaluating the competitiveness of SSS concepts, and shows where market and environmental circumstances could be handled in order to enhance the competitiveness of SSS. 展开更多
关键词 Short Sea Shipping BARCELONA CONTAINER port.
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