Titlebook: Optimal Spatial Interaction and the Gravity Model; Sven Erlander Book 1980 Springer-Verlag Berlin Heidelberg 1980 Gravitationsmodell (Wirt

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Sven Erlander erreicht werden können. Es sind daher zum Schneiden starksteigender Gewinde solche Drehbänke zu benutzen, bei denen vorhandene Vorgelegeräder zur Über-Setzung mitbenutzt werden können. In Abb. 9 (S. 6) ist der Spindelkasten einer solchen Drehbank gezeichnet. Das Zahnrad ., das die Bewegung auf die

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Entropy as a Measure of Dispersionnisawa, 1975, Horowitz-Horowitz, 1976, Erlander, 1977g,, Näslund, 1977). Its usefulness as such a measure has not been universally agreed upon (see e. g. Hart, 1971, Kendall, 1973, and Horowitz-Horowitz, 1976). In spite of this it may have some advantages in certain situations. We believe that the c

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A Model for the Constraintss in this chapter. To fix ideas we shall restrict ourselves to journeys to work. Our approach lends itself easily, however, to extensions into several fields, of which we shall discuss a few in Part III.

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The Objective Function and Our Minimization Problem that the proportion of trips from and to each area must equal the given proportions of people living and working respectively in each area. (Incidentally, the division of the studied region into living areas may be different from the division into working areas and the number of living areas may be

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GLEAN

Entropy as a Measure of Dispersion g. Hart, 1971, Kendall, 1973, and Horowitz-Horowitz, 1976). In spite of this it may have some advantages in certain situations. We believe that the case for using entropy as a measure of dispersion in our situation is a strong one.

reflection

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蚊帐

Book 1980d throughout. Models which combine descriptive and optimizing elements are not treated. The gravity model is here studied as the solution to an optimizing model. In spite of this approach, much of the material shoula be of general interest. Algorithms are not discussed. The author has benefited from

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The Transportation Planning ProcessThe transportation planning process can be divided into three stages: goal formulation, generation of alternatives and evaluation of alternatives. Goal formulation deals with the very important but difficult questions of formulating in as precise form as possible the objectives of various kinds which bear upon the transportation system.