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This paper introduces a problem in which an agent (robot, human, or animal) travels among obstacles and binary detection beams. The task is to determine the possible agent path based only on the binary sensor data. This is a basic filtering problem encountered in many settings, which may arise from physical sensor beams or virtual beams that are derived… (More)
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Simplicial and ∆-structures of configuration spaces are investigated. New connections between the homotopy groups of the 2-sphere and the braid groups are given. The higher homotopy groups of the 2-sphere are shown to be derived groups of the braid groups over the 2-sphere. Moreover the higher homotopy groups of the 2-sphere are shown to be isomorphic to… (More)
The ability to quantify pain intensity is essential when caring for individuals in pain in order to monitor patient progress and analgesic effectiveness. Three scales are commonly employed: the simple descriptor scale (SDS), the visual analog scale (VAS), and the numeric (pain intensity) rating scale (NRS). Patients with English as a second language may not… (More)
In this paper, we model complexity-based virus detection mechanisms which detect modifications and thereby prevent computer viruses from causing secondary infections. We use these models to show how to protect information in both trusted and untrusted computing bases, show the optimality of these mechanisms, and discuss some of their features. The models… (More)
means different things to different people. Some consider it as viewing the state of the environment and system. The purpose of this paper is to review some of the current methods used in security visualization.
Is virtualization the solution to computing security? A brief look at the history of computer security salvation might provide some insight. A basic concept underlying OS protection is separation. The OS provides separation of files, directories, processes, users, and devices from each other, even though the hardware lets them interact arbitrarily. In the… (More)