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a) Explain whether finite or infinite loading should be used for a manufacturer that has one specialized machine that it operatesround the clock. (3 marks) b) A custom furniture shop has the five jobs below to be done. Job Days to Finish Date Promised (in Days from Today) A 5 B 8C 6 12 D 4 10 E 1 4 Required: Compare the effect of the scheduling methods (i) EDD ( earliest due date), and (ii) SPT (smallest processing time).

Sagot :

For a producer that runs a single specialized machine continuously, finite loading should be used.

Finite loading is one of the two methods for loading work centers. Finite loading anticipates actual job starting and stopping times at each work center while also taking into consideration each work center's capacities and task processing times in order to prevent capacity from being exceeded. One benefit of finite loading is the ability to predict in detail how many hours each work center will be open. Finite loading-based schedules may require frequent, possibly daily, updates due to processing hold-ups at work centers, the addition of new works, or the cancellation of ongoing jobs.

Finite loading might represent a clear upper limit on capacity. A bus line, for example, will only have a certain number of buses. As a result, capacity is fixed by the decision to operate a specific number of buses. A manufacturer may have a single specialty machine that it continuously operates in a manner similar to this. Because of this, it is being utilized to the fullest extent possible, requiring finite loading.

(i) EDD-Jobs are scheduled in ascending order of Due Date (Date Promised):

Job          Days to         Date               Flow Time         Tardiness

                Finish           Promised

E                      1                          4                            1                             0

A                     2                          5                           3                             1

B                     8                          8                           11                            3

D                     4                         10                          15                           11

C                     6                         12                          21                           15

Average Flow time = 10.2

Average Tardiness = 6

(ii) SPT-Jobs are scheduled in ascending order of Processing time (Days to Finish):

Job          Days to         Date               Flow Time         Tardiness

                Finish           Promised

E                      1                          4                             1                             0

A                     2                          5                            3                             1

B                     8                         10                            7                            3

D                     4                         12                           13                           7

C                     6                          8                           21                           13

Average Flow time = 9

Average Tardiness = 4.8

Learn more about Finite loading, here

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