Jack's Refrigeration Repair Is Under Contract to Repair, Recondition, And/or

question 41

Essay

Jack's Refrigeration Repair is under contract to repair, recondition, and/or refurbish commercial and industrial icemakers from restaurants, seafood processors, and similar organizations. Jack currently has five jobs to be scheduled, shown in the order in which they arrived.
$$\begin{array} { | c | c | c | } \hline \text { Job } & \text { Processing Time (hours) } & \text { Due (hours) } \\\hline \mathrm { V } & 20 & 50 \\\hline \mathrm { W } & 10 & 35 \\\hline \mathrm { X } & 50 & 90 \\\hline \mathrm { Y } & 15 & 35 \\\hline \mathrm { Z } & 55 & 75 \\\hline\end{array}$$
a. Complete the following table. (Show your supporting calculations below).
b. Which dispatching rule has the best score for flow time?
c. Which dispatching rule has the best score for work-in-process (jobs in the system)?
d. Which dispatching rule has the best score for lateness?
e. What dispatching rule would you select?
Support your decision.
$\begin{array}{|c|c|c|c|c|}\hline\begin{array}{c}\text { Dispatching } \\\text { Rule }\end{array} & \text { Job Sequence } & \begin{array}{c}\text { Average Flow } \\\text { Time }\end{array} & \begin{array}{c}\text { Average } \\\text { Number of } \\\text { Jobs }\end{array} & \begin{array}{c}\text { Average } \\\text { Lateness }\end{array} \\\hline \text { FCFS } & \\\hline \text { SPT } & \\\hline \text { EDD } & \\\hline \text { CR } & \\\hline\end{array}$

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Definitions:

Physical Restraint

Physical Restraint involves the use of physical measures or devices to limit an individual's movements for safety or control reasons.

Innocent Dissemination

A defense in libel and defamation cases, arguing that the distributor of the defamatory material was unaware of its content and thus not liable.

Online Service Providers

Companies or individuals that offer services over the internet, such as web hosting, email, and social networking services.

Liability

A legal responsibility for something, particularly for costs, damages, or debts.