Exam 26: Operations Scheduling

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.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 shortest processing time (SPT)rule,what should be the sequence of jobs processed at Q45?

Which one of the following rules tends to perform well with respect to percentage of jobs past due and variance of hours past due,but performs relatively poorly with respect to average flow time?

Table J.3 Six jobs have just arrived at workstation 017;which has been idle.All the pertinent data are given in the following table.The shop works eight hours per day.It is now time zero. -Use the information in Table J.3.If the critical ratio rule is used,what is the average past due?

Why is makespan an important performance measure?

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.

The fact that job shops routinely accept new orders at any time makes the scheduling environment dynamic.

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.

Slack is the difference between the time remaining until a job's due date and the total shop time remaining,excluding that of the operation being scheduled.

Table J.13 Professor Gable and his graduate assistant are grading student term papers.The graduate assistant must first make a general evaluation and then Professor Gable makes the final grade evaluation.There are four term papers to evaluate: W,X,Y,and Z.Because the length and content differ,each paper will differ in evaluation time.The times,in hours,are estimated to be: -Use the information in Table J.13.How much time will it take to grade all four papers? That is,what is the makespan for this project?

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

Table J.2 Suppose that the following six jobs must be scheduled through a car repair facility: -Use the information in Table J.2.What is the past due time of the last job completed if sequencing is done using the SPT rule?

The earliest due date (EDD)rule gives the job with the shortest processing time the highest priority.

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:

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

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?

Total inventory is the sum of the scheduled receipts for all items and the on-hand inventories for all items.

An appropriate objective for a manufacturing firm is to maximize total inventory.

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 S/RO rule,what is the average flow time at Workstation A?

________ scheduling assigns jobs to machines or employees to jobs.