A Firm That Specializes in Desktop Publishing for Local Charities

question 117

Essay

A firm that specializes in desktop publishing for local charities has agreed to take on the following jobs. The firm has not decided which dispatching rule to apply in order to prioritize the jobs and fix them into the schedule. All dates are specified as days from Day 1.
$$\begin{array} { | r | r | r | r | } \hline \text { Start day } & 1 & & \\\hline \text { Data } & & & \\\hline & \text { Received } & \text { Time } & \text { Due Date } \\\hline \text { A } & 1 & 20 & 25 \\\hline \text { B } & 1 & 15 & 20 \\\hline \text { C } & 1 & 7 & 16 \\\hline \mathrm { D } & 1 & 25 & 50 \\\hline \text { E } & 1 & 17 & 7 \\\hline \text { F } & 1 & 13 & 32 \\\hline\end{array}$$ 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?
$$\begin{array} { | l | l | l | l | l | } \hline \begin{array} { l } \text { Dispatching } \\\text { Rule }\end{array} & \begin{array} { l } \text { Average } \\\text { Flow Time }\end{array} & \begin{array} { l } \text { Average Number } \\\text { of Jobs }\end{array} & \begin{array} { l } \text { Number of } \\\text { Jobs Late }\end{array} & \begin{array} { l } \text { Average } \\\text { Lateness }\end{array} \\\hline \text { FCFS } & & & & \\\hline \text { SPT } & & & & \\\hline\text { LPT } & & & & \\\hline \text { EDD } & & & & \\\hline \text { SLACK } & & & & \\\hline \text { CR } & & & &\\\hline\end{array}$$

---

Definitions:

Lightning Strikes

Natural, electrical discharges of very short duration and high voltage between a cloud and the ground, or within a cloud.

Humour

A cognitive process of perceiving and expressing what is amusing, comical, or laugh-inducing.

Immune Functioning

Refers to how well the immune system operates to defend the body against infections and diseases.

Negative Emotional Responses

Reactions characterized by feelings such as sadness, anger, fear, or disgust, typically as a result of stimuli perceived as negative or threatening.