We o€er a formulation that locates hubs on a network in a competitive environment; that is, customer capture is sought, which happens whenever the location of a new hub results in a reduction of the current cost (time, distance) needed by the trac that goes from the speci®ed origin to the speci®ed destination. The formulation presented here reduces the number of variables and constraints as co...

A Simple Theory of Industry Location and Residence Choice This paper provides a simple theory of geographical mobility which simultaneously explains people’s choice of residences in space and the location of industry. Residences are chosen on the basis of the utility which mobile households obtain across locations. The spatial pattern of industry is determined by the location decision of a scar...

James Carey famously noted how the telegraph’s separation of communication from transportation resulted in a “social nervous system in which signaling was divorced from musculature” (Carey, 2009, p. 215). Mobile devices make this statement increasingly true while pushing back on his assertion that geography has been made irrelevant. The authors of these books posit that mobile interfaces do not...

Distributed, real-time sensor networks are essential for effective surveillance in the digitized battlefield and for environmental monitoring. In this paper, we present the first systematic theory that leads to novel sensor deployment strategies for effective surveillance and target location. We represent the sensor field as a grid (twoor threedimensional) of points (coordinates), and use the t...

– Conventional segregation indices indicate complete integration when the proportion of minorities in a metropolitan area is replicated in any subarea. However, this would not occur, even absent discrimination, because majorities and minorities have different distributions of other residence-determining characteristics. Segregation indices derived from predictions of commuting times for blacks,...

Distributed, real-time sensor networks are essential for effective surveillance in the digitized battlefield and for environmental monitoring. In this paper, we present the first systematic theory that leads to novel sensor deployment strategies for effective surveillance and target location. We represent the sensor field as a grid (twoor threedimensional) of points (coordinates), and use the t...