The following table gives the operation times and due dates for five jobs which are to be processed on a machine. Assign the jobs according to the shortest operation time. JOB 101 PROCESSING DUE DATE TIME (DAYS HENCE) 4 days 102 5 days 103 2 days 104 7 days 105 3 days 5 3 Mean flow time 4 7 2 Calculate the mean flow time. (Round your answer to 1 decimal place.) days
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- Consider the problem of assigning multiple jdentical machines to an individual operator for the following situations: the loading and unloading time is 5 minutes, the independent operator activity time is 2 minutes, the independent machine activity time is 15 minutes. (a) How many machines should be assigned so that the operator will not be idle? What is the machine idle time in this case? (b) How many machines should be assigned so that machines will not be idle? What is the operator idle time in this case?Currently a company that designs Web sites has six customers in its backlog. The time since the order arrived, processing time, and promised due dates are given in the following table. Job Time Since Order Arrived (days ago) Processing Time (days) Due Date (days from now) A 6 18 48 B 4 22 52 C 1 30 70 D 10 14 28 E 7 12 56 F 5 20 62 Develop a schedule by using the first-come, first-served (FCFS) rule and calculate the average flow time and average days past due for the schedule. Develop a schedule by using the earliest due date (EDD) rule and calculate the average flow time and average days past due for the schedule. Comment on the performance of the FCFS and EDD rules relative to average flow time and average days past due.Consider again the case of One Hour Loan. Recall that activity 1 takes 4 minutes/loan,activity 2 takes 5 minutes/loan, activity 3 takes 7 minutes/loan, activity 4 takes 2 minutes/loan, and activity 5 takes 4 minutes/loan. Recall further that currently the assignment of tasks to workers is as follows: W1 does activity 1, W2 does activities 2 and 3,and W3 does activities 4 and 5.How would you rebalance the process to maximize process capacity, assuming that thefive activities have to be carried out in the given order?
- The following table gives the operation times and due dates for i ve jobs that are to beprocessed on a machine. Assign the jobs according to the shortest operation time andcalculate the mean l ow time.Processing Due DateJob Time (Days Hence)101 6 days 5102 7 days 3103 4 days 4104 9 days 7105 5 days 2Five 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 Sigma before work center Delta. According to Johnson's rule, what sequence of jobs will minimize the completion time for all jobs? Job Sigma Delta R 20 10 S 25 30 T 30 20 U 35 35 V 15 25 Part 2 A. V−S−U−T−R B. V−R−U−S−T C. R−V−T−S−U D. S−U−T−V−R E. R−S−T−U−VThe manager of the Personnel Department at City Enterprises has been reading about time-driven ABC and wants to apply it to her department. She has identified four basic activities her employees spend most of the their time on: Interviewing, Hiring, Assessment, and Separation Processing. The department employs 5 staff who perform these activities. The manager provides the following estimates for the amount of time it takes to complete each of these activities: Interviewing: 45 minutes. Hiring: 60 minutes. Assessment: 75 minutes. Separation Processing: 90 minutes. Employees in Personnel work 35-hour weeks with four weeks for vacation. Of the 35 hours, five are reserved for administrative tasks, training, and so on. The costs of the Personnel Department, including any allocated costs from other staff functions, are $972,000. During the year, Personnel conducted 1,200 interviews, made 375 hires, made 3,000 assessments, and had 250 separations. The manager of the Personnel…
- The single machine-scheduling problem consists of: Select one: None is correct n jobs with the same single operation on each of the jobs. n jobs with m operations on each of the jobs. n jobs with different operations on each of the jobs.Raquel’s Landscaping Company has contracted for several landscaping jobs. Each job requires preparing the areas (identifying the locations and types of plants, preparing the soil, etc.) and then planting the trees, bushes, and shrubs. The expected time for each of the jobs is shown next. Job Preparingthe Area (days) Planting(days) R 3 2 S 1 3 T 4 5 U 8 5 V 6 4 W 4 3 Raquel is concerned with efficiency. She believes it is probably more efficient to use SPT (shortest processing time) as her priority rule. (a) Develop a sequence using SPT based on processing time for preparing the area. (If two of more jobs have the same processing time, list them alphabetically.) Preparing the Area select a job select a job select a job…The Hickory Company manufactures wooden desks. Manage-ment schedules overtime every weekend to reduce the backlogon the most popular models. The automatic routing machineis used to cut certain types of edges on the desktops. The fol-lowing orders need to be scheduled for the routing machine: The due dates reflect the need for the order to be at its nextoperation.a. Develop separate schedules by using the FCFS and EDDrules. Compare the schedules on the basis of average flowtime and average past due hours.b. Comment on the performance of the two rules relative tothese measures
- An independent accountant is planning to prepare tax returns for six of her clients.Prior to her actually preparing each return, her secretary checks the client’s file to besure all the necessary documentation is there and obtains all the tax forms needed forthe preparation of the return. Based on past experience with the clients, her secretaryestimates that the following times (in hours) are required for preparation of the returnand for the accountant to complete the necessary paperwork prior to filing each return:Client Secretary Time Accountant Time1 1.2 2.52 1.6 4.53 2.0 2.04 1.5 6.05 3.1 5.06 0.5 1.5In what order should the work be completed in order to minimize the total timerequired for all six clients?Consider a business process in which each order that arrives is split into two jobs that are performed in parallel and are then rejoined before leaving the system. Assume no variance in inter-arrival times nor in process times for each task. Each station (depicted by a rectangle) contains one or more identical parallel servers (depicted by circles). Each server is independent of all others and can work on one job at at a time. Process times for individual servers at station A are 5 minutes. Servers at stations B and C have process times of 3 and 6 minutes respectively. Consider the system with one server at each of the stations A and B as before, and two identical parallel servers (each with a 6 minute process time) at station C. What is the system's capacity? What is the cycle time for each order through the entire process flow?state whether or not each situation would be considered “compensable time” (and why or why not). Toby works as Call Center Representative. He works from 7am – 4:30am, Monday – Friday with 30minutes for lunch. He also typically takes several “mini-breaks” during the day to smoke. These breakstypically range from 5-10 minutes in length and he would typically take at least, one in the morning andone in the afternoon. Toby prefers to eat his lunch at his desk, however he also tends to answerquestions from his manager and even his co-workers throughout his lunch, because he is the seniorrepresentative on that team. This occurred for at least a year. Toby recently was let go because due toa downsizing in the department. Toby called his former manager, Kelly and stated that he was owed 30minutes of pay for the past year because technically he was doing work while eating. Kelly stated thatthis was not correct, he was on a lunch break and answering questions was completely voluntary. Shewent on…