When can spatial property rights solve the ubiquitous tragedy of the commons? We explore game theoretic outcomes under decentralized spatial property rights with spatial externalities. Efficiency depends critically on spatial connectivity; the outcome may be equivalent to Open Access, Sole Ownership, or points in between. Profit sharing enhances efficiency, but may not be subgame perfect. A ren...

In this paper, we describe research into learning a model of the general 3D spatial relationships between objects found in human environments. Our approach trains a maximum entropy model using the qualitative spatial relationships between all the objects in several environments and produces a model of the underlying spatial regularities between the objects. It is tested as a purely spatial obje...

4 A drawing of a graph is pseudolinear if there is a pseudoline arrangement such that 5 each pseudoline contains exactly one edge of the drawing. The pseudolinear crossing 6 number c̃r(G) of a graph G is the minimum number of pairwise crossings of edges in 7 a pseudolinear drawing of G. We establish several facts on the pseudolinear crossing 8 number, including its computational complexity and i...

Distortion inherent to a previously described system for acquisition of two-dimensional monochromatic spatial images is described. A solution is offered in the form of an improved instrument. The system uses a Czerny-Turner monochromator for spectral discrimination and a charge-coupled device (CCD) as the detector. A second Czerny-Turner monochromator, with identical dimensions, is added to cor...

A study in the educators' work station at baby nursery of NDI/UFSC, located in Florianópolis, was conducted using the Work Ergonomic Analysis methodological tool. The demand considered was the educators' physical exhaustion caused by the weight carried when taking care of the babies, the postures assumed during the labor activity and the spatial arrangement of the baby nursery. Thinking ergonom...