Exam 16: Short-Term Scheduling

Five jobs are waiting to be processed.Their processing times and due dates are given below.Using the shortest processing time dispatching rule,in which order should the jobs be processed?

In manufacturing scheduling,physical inventories of goods can buffer variations in demand,but service scheduling normally lacks that buffer because services are generally consumed at the same time they are delivered.

Machines A,B,C,and D have been in use for several years,while machine E is new.The following table provides data on the value of production of each job when performed on a specific machine. (a)Determine the set of assignments that maximizes production value. (b)What is the total production value of your assignments? (c)Which machine should be retired (i.e.,gets no assignment)?

A work center is interested in limiting work-in-process by not allowing production to start again until the current batch is finished.The best solution most likely involves:

Five jobs are waiting for processing through two work centers.Their processing time (in minutes)at each work center is contained in the table below.Each job requires work center Alpha before work center Beta.According to Johnson's rule,what is the optimum sequence of jobs and the minimum time for completion of all jobs?

A practitioner of family medicine begins her day with five patients needing urgent care.She does a very brief assessment of what each patient appears to need and estimates the time required of each.None of the cases is life-threatening,and so she determines to take the five in the order that they arrived at the clinic.The processing-time data for these patients,in the order they arrived,are: Patient A,30 minutes; Patient B,40 minutes; Patient C,10 minutes; Patient D,50 minutes; and Patient E,15 minutes.(a)If it is now 8:00 a.m.,at what time will the doctor be finished with all five of these emergencies?(b)How much time will the five patients have collectively spent waiting?(c)How much less time would have been spent waiting if the doctor had taken the patients according to shortest processing time?

________ determines the order in which jobs should be done at each work center.

What is a scheduling technique used to achieve an optimum,one-to-one matching of tasks and resources?

Scheduling optimization systems used in retail stores typically track customer traffic in 4-hour time increments.

Explain,in your own words,how backward scheduling and forward scheduling differ.

________ is the assignment of jobs to work or processing centers.

What are some limitations of rule-based scheduling systems?

Flow time represents the time:

Process-focused facilities and repetitive facilities generate forward-looking schedules,but process-focused facilities do this with JIT and kanban while repetitive facilities generally use MRP.

The assignment method is:

If job 5 takes 3,4 or 5 hours to be completed by workers A,B,and C,respectively,what would the row values for job 5 be after performing Step 1A of the assignment method?

Lockport Marine Services,Inc.wishes to assign a set of jobs to a set of machines.The following table provides data on the cost of production of each job when performed on a specific machine. (a)Determine the set of assignments that minimizes production cost. (b)What is the total production cost of your assignments?

A Gantt load chart shows the loading and idle time of several departments,machines,or facilities.

Johnson's rule sequences a set of jobs through two different machines or work centers in the same order.

Which of the following is TRUE regarding services scheduling?