Exam 17: Supplement J Operations Scheduling

Table J.1 The framing department has six jobs waiting to be processed. It is now time zero. Times are expressed in terms of days. -Using the information in Table J.1 and the EDD rule, what is the average early time?

Table J.12 The Feast Janice prepares a medley of pastas for her brother Tony. Each of the pastas must first be rolled and then formed (or in some cases stuffed) before cooking. The required time on each machine in minutes is indicated in the table. -Janice decides to minimize the average flow time of the pastas using Johnson's rule. Which pasta occupies the middle position of her schedule?

Why is makespan an important performance measure?

Use the information in the preceding table and sequence the six jobs using FCFS, SPT, and EDD. Calculate the average flow times, average early times, and average past due.

Table J.16 Five jobs are currently waiting to be processed. Each job has to go through Machine 1 first and then Machine 2 before it is completed. The processing times (in hours) for the five jobs on each machine are: -Use the information in Table J.16. What is the makespan through both machines if Johnson's rule is used?

A manufacturer's flow shop utilizes line or continuous flow processes.

Table J.10 A workstation has six jobs waiting to be processed. They arrived at the end of Day 0 and it is now the beginning of Day 1. It is now time zero. Times are expressed in terms of days. -Using the information in Table J.10 and the earliest due date (EDD) rule, which job(s) will be completed on or before their due dates?

A(n) ________ specializes in low- to medium-volume production using job or batch processes.

________ is a procedure that minimizes makespan in scheduling a group of jobs on two workstations.

Table J.9 There are three jobs available for processing at Workstation 1. They just arrived at Workstation 1, at the end of Day 0. -Using the information in Table J.9 and the critical ratio rule, what is the average flow time?

Utilization is the degree to which equipment, space, or the workforce is currently being used, measured as the ratio of average output rate to the maximum capacity.

Table J.1 The framing department has six jobs waiting to be processed. It is now time zero. Times are expressed in terms of days. -Using the information in Table J.1 and the EDD rule, what is the average flow time?

Table J.5 The following three jobs just arrived (end of hour 0) at Workstation A. They are the only ones waiting to be processed. -Use the information in Table J.5. The average past due using the ratio (CR) rule, is:

Table J.14 Gable Bakery has five cake orders to be processed today. Each cake has to go through the baking and decorating processes. The baking and decorating times are estimated as follows: -Use the information in Table J.14. In what sequence should the orders be processed to minimize the total processing time?

Use the information in the table and sequence the six jobs using SPT and EDD. Calculate the average flow times and average lateness. All jobs arrived at time zero and are ready at time zero.

In the context of operations scheduling, total inventory is the sum of the scheduled receipts for all items and the on-hand inventories for all items.

Consider the following problems in which four jobs must each be processed on two machines starting with Machine A and then going to Machine B. The following processing times are available (in hours): What is the minimum makespan for this group of jobs? Depict it graphically using a Gantt chart.

Table J.9 There are three jobs available for processing at Workstation 1. They just arrived at Workstation 1, at the end of Day 0. -Using the information in Table J.9 and the slack per remaining operation (S/RO) rule, what is the average days past due?

Describe the difference between front office and back office operations from the standpoint of scheduling customer jobs.

A job's flow time at a single workstation is defined as the: