M. John Hodgson

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The multi-vehicle covering tour problem is de"ned on a graph G"(<X=, E), where= is a set of vertices that must collectively be covered by up to m vehicles. The problem consists of determining a set of total minimum length vehicle routes on a subset of <, subject to side constraints, such that every vertex of= is within a prespeci"ed distance from a route.(More)
This paper describes the design and implementation of OBJECTSIM. OBJECTSIM overcomes the narrow focus of previous architecture simulators by specifying a small number of generic simulation objects (and an associated hierarchy) that are capable of implementing a wide range of target systems. Target systems range from multi-stage interconnection networks(More)
Location-allocation models can play an important role in making primary health care facilities more accessible to rural populations in the developing world. Traditional models, however, have failed to deal realistically with the fact that health care systems are hierarchical in nature, and that benefits and utilization decline with distance. In this paper,(More)