For the job-shop model of Sec. 2.7, we can now carry out a better analysis for the questio...

For the job-shop model of Sec. 2.7, we can now carry out a better analysis for the question of deciding which workstation should be given an additional machine. (See Sec. 2.7.3 and note from Fig. 2.46 that, on the basis of a single replication of the existing system, workstations 1, 2, and 4 appear to be the three most congested stations.) Use the  procedure of Sec. 10.4.1 to recommend whether a machine should be added to station 1, 2, or 4, assuming that these are the only three possibilities; let n₀ = 20, P* = 0.90, and d* = 1. Use the steady-state expected overall average job total delay as the measure of performance; to obtain the X_ij observations, warm up the model for 10 eight-hour days and use the data from the next 90 days, as in Prob. 2.7. Compare your conclusions with those at the end of Sec. 2.7.3. From the moral of Example 10.1, how might this entire study be improved?

FIGURE 2.46 Output report, job-shop model.

Example 10.1

FIGURE 10.1 One Zippy or two Klunkys?