Exam 25: Operations Scheduling

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,develop a schedule that minimizes makespan for these seven jobs.Assume that job C could be neatly split into two equal parts,each having half of the processing time on each machine as the full job C.Using your original sequence,but splitting job C,what is the reduction in makespan for the seven jobs?

Why is flow time an important measure of performance?

Stu schedules his assignments using the critical ratio criterion.How many assignments are late?

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 CR rule,what is the average flow time at workstation A?

Total inventory is equal to:

Table J.10 A workstation has six jobs waiting to be processed.They arrived at the end of Day 0 and it is now the beginning of Day 1.It is now time zero.Times are expressed in terms of days. -Using the information in Table J.10 and the earliest due date (EDD)rule,which job(s)will be completed on or before their due dates?

Johnson's rule is a procedure that minimizes makespan in scheduling a group of jobs on two workstations.

The percent of work time productively spent by an employee or a machine is called:

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

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.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:

Stu whips up a schedule based on the critical ratio criterion.What is the average number of assignments in the system?

A(n)________ specializes in medium- to high-volume production and uses line or continuous flow processes.

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 assignments scheduled in an SPT sequence?

What is the average flow time for all seven assignments if Stu schedules them using the critical ration criterion?

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

A(n)________ is the object receiving service or being manufactured.

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,what is the makespan for these seven jobs?

Consider the following problems in which four jobs must each be processed on two machines starting with Machine A and then going to Machine B.The following processing times are available (in hours): What is the minimum makespan for this group of jobs? Depict it graphically using a Gantt chart.

A job's flow time at a single workstation is defined as the: