Gerald C. Cohen

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ion PIU-Environment Clock-Level Behavior PIU-Environment Clock-Level Structure PIU Clock Level 1_ Composition Environment Clock Level Figure 2.1: Example PIU Specification Hierarchy Using Clock-Level Composition. Figure 2.2 describes a competing approach where abstraction is performed within the subsystems themselves, before composition. The abstract PIU(More)
In brief: Two runners who were not aware they had conceived continued their intense running regimens during the first and second trimesters of pregnancy. Both women assumed that their amenorrhea was due to endurance training. When their pregnancies were diagnosed, both women markedly reduced their training mileage during the third trimester because they(More)
Bicycle-related injuries have increased as cycling has become more popular. Most injuries to recreational riders are associated with overuse or improper fit of the bicycle. Injuries to racers often result from high speeds, which predispose riders to muscle strains, collisions, and falls. Cyclists contact bicycles at the pedals, seat, and handlebars. Each is(More)
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