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Abraham Akkerman 《Geographical analysis》2000,32(3):247-266
Places of household residence and places of commuter destination are considered in a contiguous system of subareas constituting a region. An intrahousehold distribution of household members, by subarea of their commuting destination, is considered for each subarea of residence. A household composition matrix is constructed in reference to the average number of commuters to subareas of destination, per household at a subarea of residence, across all subareas. The matrix is a linear transformation from the spatial distribution of households onto the spatial distribution of daytime population, over all subareas of the region. Diurnal population change throughout the region is rendered by this transformation. A linear optimization model extending this transformation formalizes general conditions that relate the diurnal population system to household choice of residence and work. Further, the division of the region into subareas is assumed to be such that the average household in each subarea contains at least one person who remains in the subarea during day and night. Under these conditions, the diurnal system is shown to be analogous to the Leontief input‐output model. An example of eleven counties of North Wales, along with an exogenous area of northwestern England, drawn from the 1991 census of the United Kingdom, illustrates the formal relationships. 相似文献
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The current study explores the use of children's photographs to establish a dialogue about everyday life with healthy siblings of refugee children with severe withdrawal symptoms (SWS). Asylum-seeking refugee children in Sweden with SWS have been officially observed since 2000, yet research has overlooked their healthy siblings. We studied three healthy siblings and found photography to be an applicable communicative tool. When parents focus their attention on the ill child, the healthy children create space for themselves and indicate both resilience and vulnerability. We suggest that, together with a dialogue, children's own photographs are useful for research with refugee children in vulnerable situations. 相似文献
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