Philip K. W. Cheng

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We study the p-median problem which is one the classical problems in location theory. For p = 2 and on a two-dimensional mesh, we give an O(mn 2 p)-time algorithm for solving the problem, where, assuming that m n, m is the number of rows of the mesh containing demand points, n the number of columns containing demand points, and p the number of demand points.
Sleep and circadian rhythms significantly impact almost all aspects of human behavior and are therefore relevant to occupational sleep medicine, which is focused predominantly around workplace productivity, safety, and health. In this article, 5 main factors that influence occupational functioning are reviewed: (1) sleep deprivation, (2) disordered sleep,(More)
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