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- W642967781 abstract "This paper describes how finding the solution for large scale equilibrium demand forecasting models is a time consuming exercise. Even now computer calculation times can become unacceptably high. The Dutch National Model System (LMS) models the whole of the Netherlands. The current system, LMS 7.0, has about 350 zones for the assignment (1,300 subzones are used to determine the demand). At its introduction in 1997 the computing times were considerable. Even with a clever iteration scheme (iterating between different levels of demand and their assignment to the network) the computing times would be about two days. With the use of computers this is now reduced to hours. In practice there have been indications that the iteration scheme does not end up as close to the optimum as expected, so a new iteration scheme is needed. Currently an update of the model system is in progress. The new model system now has some 1,500 zones, both for the assignment as well as to determine the demand. This alone has led to a considerable increase of the computing time and even with computers one iteration takes half a day. Moreover, the model system is also used with more detail at the regional level, with a range of 2,800-3,600 zones. This paper presents the search and results of finding an optimal iteration scheme that will provide the best possible result in the shortest amount of time." @default.
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- W642967781 date "2010-01-01" @default.
- W642967781 modified "2023-09-24" @default.
- W642967781 title "Convergence of the Dutch National Model System" @default.
- W642967781 hasPublicationYear "2010" @default.
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