The document discusses various scheduling techniques used in operations management. It covers topics like routing, loading, dispatching rules (earliest due date, longest processing time, etc.), Gantt charts, Johnson's job sequencing rule, queuing analysis and critical ratio method. Examples are provided to illustrate concepts like computing dispatching rules, applying Johnson's rule to sequence jobs on multiple machines, solving queuing problems and calculating critical ratios. Self-assessment questions are included to check understanding of terms like slack time remaining (STR) and concepts like who developed Gantt charts.

1. 24/2/07 H Dangi 1 Operations Management Scheduling Techniques Hamendra Dangi hkdangi@yahoo.com 9968316938

2. 24/2/07 H Dangi 2 Session Break Up Scheduling Techniques Queuing Model

3. 24/2/07 H Dangi 3 Thought of the day “If you can imagine it,You can achieve it.If you can dream it,You can become it."

4. 24/2/07 H Dangi 4 Scheduling Establishing the timing of the use of equipment, facilities and human activities in an organization Effective scheduling can yield Cost savings Increases in productivity

5. 24/2/07 H Dangi 5 Scheduling Activities Routing : can be described as the specification of work flow. It explains the sequence of operation and process to be followed in order to produce a product Loading : Assigning specific jobs to each work center for the planning period. Dispatching : final act of releasing job order to the workers to go ahead with production process.

6. 24/2/07 H Dangi 6 Dispatching rule Earliest due date Longest processing time Shortest processing time First in , first serve Slack time remaining

7. 24/2/07 H Dangi 7 The processing and due time are

8. 24/2/07 H Dangi 8 Develop the order in which job are to be processed using EDD LPT SPT FIFS STR

9. 24/2/07 H Dangi 9 Question for Discussion

10. 24/2/07 H Dangi 10 Compute: EDD LPT SPT FIFS STR

11. 24/2/07 H Dangi 11 Scheduling Techniques Gantt charts Johnson’s Job sequencing rule

12. 24/2/07 H Dangi 12 Gantt Chart Example

13. 24/2/07 H Dangi 13 Johnson’s Rule technique for minimizing completion time for a group of jobs to be processed on two machines or at two work centers. Minimizes total idle time

14. 24/2/07 H Dangi 14 Johnson’s Rule Optimum Sequence List the jobs and their times at each work center Select the job with the shortest time Eliminate the job from further consideration Repeat steps 2 and 3 until all jobs have been scheduled

15. 24/2/07 H Dangi 15 Example A firm produces six types of fan blades and manufacturing of blade require processing on two machines. Machine A and machine B The processing time of each blade on both machine A and B are given below.

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18. 24/2/07 H Dangi 18 Question for Discussion Five jobs are to be scheduled in two machine in manufacturing shop. All the five jobs undergo processing in both the machines and table below has information on the processing time in both the machine

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20. 24/2/07 H Dangi 20 Identify the best sequence using Johnsons Rule

21. 24/2/07 H Dangi 21 Ans 3-1-4-5-2

22. 24/2/07 H Dangi 22 Queuing Analysis Queuing Analysis involves the study of waiting lines and queuing system A queue refers to customers or units waiting for service , when the rate of arrival of customer exceeds the service rate a queue is formed.

23. 24/2/07 H Dangi 23 Example A Xerox machine in an office is operated by a person who does other jobs also. The average service time for job is 6 minutes per customer . On an average in every 12 minutes one customer arrives for Xeroxing.

24. 24/2/07 H Dangi 24 Find : A) utilization ratio B) Average queue length C) Average time spent in system D) waiting time in queue

25. 24/2/07 H Dangi 25 At a certain petrol pump .customer arrive according to a Poisson process with an average time of 5 minutes between arrivals .The service time is exponential distributed with mean 2 minutes .On the basis of this information find out

26. 24/2/07 H Dangi 26 i) Average queue length Ii ) Average no of customer in system Iii ) Utilization ratio

27. 24/2/07 H Dangi 27 i) 4/15 ii 2/3 iii ) 40 %

28. 24/2/07 H Dangi 28 Critical ratio Method It is the ratio of actual time remaining and to complete the job and scheduled time remaining to complete the job Critical ratio = Actual time remaining/Scheduled time remaining

29. 24/2/07 H Dangi 29 Example XYZ Co has started three jobs that require 28, 31 and 21 days to complete respectively . The MD has engaged three teams to execute each of these jobs After the lapse of 18 days, the manager of three job that the times required to complete the jobs are 11,14 and 8 days respectively Calculate the critical ratio of each job

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31. 24/2/07 H Dangi 31 Scheduling Service Operations Appointment systems Reservation systems

32. 24/2/07 H Dangi 32 Self assessment STR stands for……………..

33. 24/2/07 H Dangi 33 Gantt chart was developed by…..

34. 24/2/07 H Dangi 34 In queuing model arrival rate is denoted by…..and service rate by……….

35. 24/2/07 H Dangi 35 Internet Humor- Q: What is common between : Krishna, Ram, Gandhiji and Jesus..? A: All are born on Government holidays.

36. 24/2/07 H Dangi 36 One liner I can't dial 911.. There's no 11 on my phone. 7/5th of all people don't understand fractions. A city is a large community where people are lonely together. Being politically correct means always having to say you’re sorry.

37. 24/2/07 H Dangi 37 Practice Test