Exam 25: Operations Scheduling

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.If the SPT rule is used to determine the sequence at the cutting machine and the same sequence is also used at the painting machine,what is the makespan through both machines?

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?

Makespan is the total amount of time to complete a single job or the first job in a group of jobs.

________ is a priority sequencing rule that specifies that the job that has the earliest due date is the next job to be processed.

Operations scheduling involves assigning jobs to workstations or employees to jobs for specific time periods.

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.How long will it take her to complete the seven pastas?

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?

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,how much idle time does Team 2 have from the start of the first project through completion of the seventh?

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

Lee Beedo,a hip bachelor in Edmond,has a date for Saturday night and finds himself without a thing to wear.Faced with the daunting task of doing enough laundry to fully accessorize during his night out,Lee has sorted his clothes into loads according to fabric and color.Based on his vast experience doing laundry,Lee knows how long each load will take in both the washer and the dryer.He glances at his watch;it is now 2:00 p.m.and he has to have the last load dry by 8:30 p.m.to be there in time.Help Lee develop a schedule that will enable him to make his date on time and depict that schedule using a Gantt chart.Can he make it and,if so,by how much?

The ________ is a priority sequencing rule that is calculated by dividing the time remaining until a job's due date by the total shop time remaining for the job,including the setup,processing,move,and expected waiting times of all remaining operations,including the operation being scheduled.

A first-come,first-served schedule minimizes the average flow time for all jobs.

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.If all cakes are to be picked up at 11:00 a.m. ,what is the latest time that Gable should start making these cakes?

Table J.6 All of 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.6.What is the job sequence at Workstation A,using the critical ratio rule?

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.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.What is the average flow time of her seven pastas?

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?

________ scheduling assigns jobs to machines or employees to jobs.

Table J.11 Work center Q45 has four jobs that just arrived (the start of Day 1)to be processed,as shown in the following table.Assume the shop works eight hours per day. -Using the information in Table J.11 and the critical ratio rule,what should be the sequence of jobs processed at Q45?

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 SPT rule,what is the average past due?