Exam 17: Supplement J Operations Scheduling

Table J.2 Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester. -What is the average flow time for all seven assignments if Stu schedules them using the critical ration criterion?

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 uses Johnson's rule to schedule her pasta production. When is the Manicotti done on the Roller?

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 sequence of jobs using the slack per remaining operations (S/RO) rule, is:

________ scheduling assigns jobs to machines or employees to jobs.

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

What are single-dimension scheduling rules? Provide examples and discuss how each rule performs.

Table J.18 -Use the information in the table and sequence the jobs using the EDD rule. What is the average past due?

Makespan is the time of completion of a group of jobs, plus the starting time of the first job.

Table J.7 The following four jobs just arrived (end of hour 0) at Workstation A. They are the only ones waiting to be processed. -Using the information in Table J.7 and the slack per remaining operations (S/RO) rule, what is the job sequence?

Table J.15 Consider the following problem in which four jobs that arrived this morning are to be processed on two machines. They start with the cutting machine and then go to the painting machine. The following processing times are available (in hours): -Use the information in Table J.15. What is the makespan through both machines if Johnson's rule is used?

Training workers on a variety of machines and tasks decreases flexibility of operations and leads to labor-limited environments.

Sometimes referred to as the world champion, the ________ rule is a priority sequencing rule that minimizes the mean flow time and tends to maximize utilization.

Of the following examples for labor-assignment rules, which of the following is least likely to be utilized:

A workstation has five jobs that just arrived (the start of Day 1) to be processed, as shown in the following table. Use this information to sequence the five jobs using FCFS, SPT, EDD, S/RO, and CR. Calculate the average flow times, average early times, and average past due.

________ is the time a job spends in the service or manufacturing system.

________ is the degree to which equipment, space, or the workforce is currently being used.

Table J.17 A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table. -Using the information in Table J.17 and Johnson's rule, on which day will project F be completed?

Table J.7 The following four jobs just arrived (end of hour 0) at Workstation A. They are the only ones waiting to be processed. -Using the information in Table J.7 and the critical ratio (CR) rule, what is the job sequence?

Table J.2 Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester. -Stu decides to adopt an SPT sequence for the assignments, which at face value seems like an odd choice. Which assignments will he be submitting late?

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 slack per remaining operations (S/RO) rule is: