Exam 15: Short-Term Scheduling

Complete the table,find average lateness,find average completion time,and average number of jobs in the system.Assume all durations are in days and that the jobs are processed at the shop in the order that they arrive (A then B then C then D).

Which of the following files tracks work order progress?

The word "finite" in finite capacity scheduling refers to the use of finite or limited capacity rather than unlimited capacity.

A recent advance in short-term scheduling that makes use of expert systems and simulation in solving dynamic scheduling problems is

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)? d.If they do retire one machine,will they be as profitable without it as with it? Explain.

Given the following chart of jobs assigned with Johnson's rule suppose that all the jobs (A,B,C,etc)could be evenly divided into two tasks (such as A1 and A2,B1 and B2,etc).Suppose job D is split into two equivalently sized sections,D1 and D2,each with a body work time of 1.5 hours and a paint time of 2 hours (D1 and D2 sum to 3 hours of body work and 4 hours of paint which is equivalent to D).How much is makespan reduced by this splitting of D?

Which of the following is an aid used to monitor jobs in process?

Consider the arrival of patients into a public health clinic.Some patients are ill;some are injured;some are elderly;and some are very young.Some cases may be life-threatening,while others are inconsequential.How do the basic dispatch rules fall short in this situation? Design a dispatch rule for scheduling these patients.

What are some limitations of rule-based scheduling systems? What alternatives are there to rules-based scheduling systems?

Describe finite capacity scheduling in a sentence or two.What is its role in short-term scheduling?

________ uses computerized short-term scheduling to overcome the disadvantages of rule-based systems by providing the user with interactive computing and graphical output.

In repetitive manufacturing,what are the advantages of level material use? Does level material use have any role in intermittent process facilities?

The constant work-in-process (ConWIP)card aids input-output control by limiting the amount of work in a work centre.

Which of the following is not tracked by scheduling optimization systems used in retail stores?

Which of the following is not an effectiveness criterion for scheduling?

The objective of scheduling is to

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 data for these patients,in the order they arrived,is 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?

Forward scheduling

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?

At Morgan's Transformer Rebuilding,a set of five jobs is ready for dispatching to a machine centre.The processing times and due dates for the jobs are given in the table below.Use shortest processing time to sequence the jobs,and calculate the average completion time,the average job lateness,and the average number of jobs in the machine centre.