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Exam 14: Operations Scheduling and Sequencing

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Question 31

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A tardiness measure can be either zero 0) or a positive number.

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B) False

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Question 32

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What four 4) decisions are considered in designing an appointment system?

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Service capacity is perishable and appoi...

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Question 33

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Triage by nurses in an emergency room would be an example of

The shortest processing time rule and earliest due date rule will always provide the same sequence.

Which of the following is NOT a criterion for evaluating job sequencing rules?

Appointments systems often overbook to maximize revenue.

Indirectly, appointments reduce the cost of providing a service because the service provider is idle less each workday.

In sequencing a set of jobs on a single processor, different sequences will have different makespans but the same average flow times.

The sequencing rule that minimizes the maximum number of jobs that are past due from a given set of jobs is

A print shop has four jobs that have to be processed through their only five?color press. They usually use the first-come first?served method of scheduling jobs. However, the customers are waiting in the lobby for these jobs so the shop wants to minimize the average waiting time. They are going to use the shortest processing time rule to do so. Processing times for each job are as follows assume this is the arrival order): Job A, 30 minutes; Job B, 17 minutes; Job C, 12 minutes; Job D, 39 minutes. a. In what order should the four jobs be done using the shortest processing time rule? b. What is the average( waiting flow) time for all jobs using the shortest processing time rule? c. What is the averaging (waiting flow) time using their usual first?come first?served rule?

Give at least five examples of service organizations and employee type) where, due to high variability in customer demand, staff scheduling problems are prevalent.

A restaurant needs the following number of wait staff to serve its evening guests. $\begin{array} { | c | c | c | c | c | c | c | c | } \hline \text { Day: } & \text { M } & \text { Tu } & \text { W } & \text { Th } & \text { F } & \text { Sa } & \text { Su } \\\hline \begin{array} { c } \text { Minimum Number of } \\\text { Wait Staff Needed: }\end{array} & 5 & 2 & 1 & 4 & 6 & 7 & 2 \\\hline\end{array}$ How many employees are needed so that each as two consecutive days off? Construct a work schedule for these employees.

Describe Johnson's sequencing rule for the two-resource sequencing problem.

Compare and contrast the advantages and disadvantages of the Shortest Processing Time SPT) and the Earliest Due Date EDD) sequencing rules.

Explain the three categories of criteria used to evaluate job sequencing performance. For each category, provide two example measures.

The chief disadvantage of the shortest processing time rule is:

A company is faced with seven tasks that have to be processed through two work centers, work center I and then center II. Assume work center I works continuously and that they are using Johnson's rule. Work centers need not change over to new jobs at the same time. Data appears below in hours: $\begin{array} { | c | c | c | } \hline \text { ask } & \text { Wark Center I } & \text { Work Center II } \\\hline \text { A } & 2.58 & 3.47 \\\hline \mathrm { B } & 1.66 & 5.84 \\\hline C & 2.71 & 2.41 \\\hline \mathrm { D } & 5.52 & 1.99 \\\hline E & 3.38 & 7.62 \\\hline \mathrm { F } & 5.22 & 1.73 \\\hline \text { G } & 2.89 & 1.11 \\\hline\end{array}$ a. What is the sequence of tasks? b. What is the time in hours to complete all the tasks in both work centers? c. What is the total idle time in hours for work center I? d. What is the total idle time in hours for work center II?

In sequencing jobs in a flow shop with two resources, Johnson's rule finds a sequence that has the smallest makespan.

Telling an umpire crew to work baseball games in Chicago, then Milwaukee, and then Cleveland is an example of a sequence.

The time to rest and travel between games for baseball umpire crews is an important factor in developing their schedule.