排序方式: 共有55条查询结果,搜索用时 234 毫秒
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Leonid Engelson Mogens Fosgerau 《Transportation Research Part B: Methodological》2011,45(10):1560-1571
This paper derives a measure of travel time variability for travellers equipped with scheduling preferences defined in terms of time-varying utility rates, and who choose departure time optimally. The corresponding value of travel time variability is a constant that depends only on preference parameters. The measure is unique in being additive with respect to independent parts of a trip. It has the variance of travel time as a special case. Extension is provided to the case of travellers who use a scheduled service with fixed headway. 相似文献
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The value of travel time variance 总被引:1,自引:0,他引:1
This paper considers the value of travel time variability under scheduling preferences that are defined in terms of linearly time varying utility rates associated with being at the origin and at the destination. The main result is a simple expression for the value of travel time variability that does not depend on the shape of the travel time distribution. The related measure of travel time variability is the variance of travel time. These conclusions apply equally to travellers who can freely choose departure time and to travellers who use a scheduled service with fixed headway. Depending on parameters, travellers may be risk averse or risk seeking and the value of travel time may increase or decrease in the mean travel time. 相似文献
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To implement efficient production control, this paper provides a timed colored Petri net (timed CPN) approach to performance modeling, real-timed dispatching and simulation of Panel hull block assembly system (PHBAS). The definition of Petri net is extended to accord with the real-world PHBAS’s organization, and the modeling method for hull flow production is provided in order to simplify modeling program. Using modeling and analyzing method, the dynamic characteristics of the system can be emulated and quantitatively calculated and work control tactics can be optimized. For the double bottom hull block shipbuilding system in a recently built shipyard in China, the simulation model with timed CPN was described and the system parameters and optimal task sequence which has the minimum operation time were obtained for a scheduling case. 相似文献
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杨立君 《湖北汽车工业学院学报》1997,(2):24-29
本文在对Flowshop排序问题的几种主要启发式方法进行深入剖析的基础上,提出了一种新的启发式方法,这种方法不仅简单实用,工作量小,能迅速求得排序问题的解。而且优度较高,能得到近似最优的排序方案。 相似文献