A slow-wave electroencephalographic rhythm recorded from the sensorimotor cortex of the waking cat has been correlated behaviorally with the suppression of movement. Facilitation of this rhythm through conditioning selectively enhances a similar pattern recorded during sleep, the familiar spindle burst. The training also produced longer epochs of undisturbed sleep. The specific neural mechanism manipulated during wakefulness appears to function also in sleep and to be involved with the regulation of phasic motor behavior.

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We solve for the availability of an n-processor VAXcluster system using a hierarchical approach that allows us to: 1) obtain a closed-form answer to an apparently difficult problem, and 2) determine the optimal number of processors in the cluster for a given set of cluster parameters. Our novel approach is a 2-level hierarchical model in which the lower-level model is a 9-state Markov chain that is solved in a closed form. The 9-state Markov chain is then aggregated into a 3-state device analogous to a diode. Subsequently, the system availability is computed by analyzing a simple network.