(no subject) » Inbox 11:4 bright effah kyeremeh to me QUESTION 24 An automobile detailing shop has the following jobs waiting to be processed. All jobs (cars requiring detailing) must first be cleaned, then waxed Job J1 J2 J3 J4 J5 Cleaning Time 7 25 108 Waxing Time 35496 a What processing sequence will minimize the makespan for these jobs? b What is the minimum makespan for this set of five jobs? A Reply • Forward 2°C ch %23 %24 & 8 3 4. 5 6 7 081 E R Y 4 D F K EGO
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- EXAMPLE 4 Using Johnson's Rule to Sequence Jobs A gnup of sis johs is to be pressed thrugh a two-machine flow shop. The first opera- tion involves cleaning and the second involves painting. Determine a seuence thai will minimire the tatal completion time for this group of jobs. Processing times are an fillows Xcel mta te PROCESSING TIME Dhoun Jub Wark Center1 Work Center 2 A 12 15 To employ Johnan's rule, ereute a "lank" seyoence fint, such a ra deurigtimfa hrutie tha can he md ecsheeaetf i te ped thergh Ihan e Than Villina t al. Mendang annd Cl ywm, Sh d (New Y ImMC sM. ten. "Optinid The i The Nage hradun w Seup Times hachalet." Nual Renanh Quen w Mah SeThe following jobs are waiting to be processed at JulieMorel’s machine center:JOB DATE ORDER RECEIVED PRODUCTIONDAYS NEEDED DATE ORDER DUEA 110 20 180B 120 30 200C 122 10 175D 125 16 230E 130 18 210 In what sequence would the jobs be ranked according to the fol-lowing rules: (a) FCFS, (b) EDD, (c) SPT, and (d) LPT? All dates are according to shop calendar days. Today on the planning cal-endar is day 130, and none of the jobs have been started or sched-uled. Which rule is best?3. Eddie Irwin works in the data processing department at the local medical center. He is required to keep a weekly time card. Please fill out the time card Date Out Sun. Mon. Tues. Wed. Thur. Fri. Sat. 12/13 In 12/14 8:15am 12:30pm 12/15 8:35am 12:50pm 12/16 8:15am 12:10pm 1:15pm 8:30am 12 noon 12/17 8:25am In 12:30pm 1:10pm 1:30pm 12:45pm 1:50pm Out 4:30pm 5:10pm 5:00pm 4:20pm 5:30pm Total Hours>>> Hours
- 2. A small restaurant is creating a schedule for its wait staff to meet its expected weekly demand. The staff requirements have been determined to be: day monday tuesday wednesday thursday friday saturday sunday 1 staff 3. 3. The restaurant would like its staff to have two consecutive days off, with a preference given to Saturday and Sunday, or one of those two days if the pair is not possible. (a) Create a schedule to meet the staff requirements. How many wait staff are needed? (b) The restaurant believes regular maintenance of the kitchen is important. The kitchen staff would like 1 extra worker whenever they perform main- tenance. On which days of the week should maintenance be scheduled? (c) The restaurant wants to create a 'kid's day' (young children eat for free) to attract customers on days with low demand. Given your staff schedule, which day is best to implement this promotion...15.19 The following jobs are waiting to be processed at Julie Morel's machine center: PRODUCTION JOB DATE ORDER RECEIVED DAYS NEEDED DATE ORDER DUE A 180 200 175 230 210 AB B n D E 110 120 122 125 130 20 30 10 16 18 In what sequence would the jobs be ranked according to the fol- lowing rules: (a) FCFS, (b) EDD, (c) SPT, and (d) LPT? All dates are according to shop calendar days. Today on the planning cal- endar is day 130, and none of the jobs have been started or sched- uled. Which rule is best? Px33) Workstation #1 Given the following queue of 4 jobs to be processed at Workstation #1: Job Processing Time (Days) # Days Until Due A 5 12 B 11 20 C 7 10 D 9 14 In what sequence will the jobs be completed if the DDATE rule is used? Group of answer choices a) A-C-D-B b) C-A-D-B c) A-B-C-D d) C-D-A-B 34)What is the average completion time if the FCFS rule is used? Group of answer choices a) 76 b) 72 c) 31 d) 18 e) 19 f) 56
- John's printer works is involved in printing and binding works. The company has got orders from four of its customers: A, B, C, and D at the beginning of work. The processing time and due date of these jobs is given below: rules. Job (In order of Arrival) A B C D L H. 111. IV. V. Processing Time (Days) 3 5 4 2 Develop the order in which these jibs are to be processed by using the following dispatching Earliest Due Date (EDD) Longest Processing Time Shortest Processing time Due date (Days hence) First Come First Serve Slack time Remaining Also calculate the average delay of a job in each case. 4 7 6 5Enter data only in Number of Jobs 5 Job 1 2 3 yellow-shaded cells. Up to 10 jobs may be sequenced Average Average Average Number o Maximum Flowtime Lateness Tardines: Tardy Job: Tardiness 14.40 4.20 5.00 3 12.00 4 5 6 7 8 9 10 'rocessing Tim 7 3 5 2 6 Due Dat 11 10 8 5 17 iequence Processing Time Due Date Flowtime Lateness Tardiness 1 11 7 -4 0 2 10 10 0 0 3 8 15 7 7 4 5 17 12 12 5 17 23 6 6 7 3 5 2 6Job Arrived Time Due Date 8. 15 6. 11 22 C 11 8. 6. E 9. 4 9. 16 Using the information in the table and the EDD rule, what is the average days past due? days (Round off to 1 decimal place) 7, 5. 3. 8.
- TABLE 18.21 Processing Time for Eight Projects, Displayed in the Sequence They Arrived Project P1 P2 P3 Р4 P5 P6 P7 P8 Processing time (hours) 4 1 0.5 2 3 6 1 ..... 1. Given the projects displayed in Table 18.21, if FCFS is used to sequence the jobs, what is the average flow time of the projects (in hours)? 2. Given the projects displayed in Table 18.21, if SPT is used to sequence the jobs, what is the average flow time of the projects (in hours)?b. The Healthy Food Restaurant, a 24-hour restaurant, faces changing requirements from hour tohour. More workers are needed for peak hours, and fewer are needed in between. The followingTable 6 (below) shows the worker requirement for the first 12 hours in the restaurant:Table 6. Staff Requirement at the Healthy Food RestaurantTime Period 10AM11AM12PM1PM2PM3PM4PM5PM6PM7PM8PM9PMRequirement 8 10 12 12 9 7 6 7 9 10 12 8AssignedOn DutyOverstaffed8(i) You are required to apply the first-hour principle to staff each hour with the required number ofcafeteria staff, showing how many staff are on duty each given hour, the number of staffyou have assigned to work each hour and any overstaffing for each hour. i. Schedule the staff to work in 8-hour shifts.uestion 2:ID:_________________________Three jobs are to be scheduled on two machines A and B. Assume that the jobs are processed in the sequence A-B. The processing times are: JobA1 2 35 7 3B4 7 5Draw a Gantt chart that shows the schedule corresponding to the sequence 1-2-3 of the jobs.