The diiusion approximation is proved for a class of queueing networks, known as re-entrant lines, under a rst-buuer-rst-served (FBFS) service discipline. The diiusion limit for the workload process is a semi-martingale reeecting Brownian motion on a nonnegative orthant. This approximation has recently been used by Dai, Yeh and Zhou (1994) in estimating the performance measures of the re-entrant...

We propose an approximate approach for estimating the performance measures of the re-entrant line with single-jobmachines and batch machines based on the mean value analysis (MVA) technique.Multi-class jobs are assumed to be processed in predetermined routings, in which some processes may utilize the same machines in the re-entrant fashion. The performance measures of interest are the steady-st...

A microcomputer algorithm for tachycardia identification, suitable for use in an implanted antitachycardia pacemaker, is described. The system employs an atrial and ventricular electrogram, detects a sustained fast rate in either chamber, and awakens the main program to perform detailed analysis of the tachycardia and its immediately preceding beats. The algorithm distinguishes atrial, ventricu...

Recent studies indicate that the transition from sheet to cloud cavitation depends on both cavitation number and Reynolds number. In the present paper this transition is investigated analytically and a physical model is introduced. In order to include the entire process, the model consists of two parts, a model for the growth of the sheet cavity and a viscous film flow model for the so-called r...