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  1. 1. 24/2/07 H Dangi <br />1<br />Operations Management Scheduling Techniques <br />Hamendra Dangi <br /><br />9968316938<br />
  2. 2. 24/2/07 H Dangi <br />2<br />Session Break Up<br />Scheduling Techniques <br />Queuing Model <br />
  3. 3. 24/2/07 H Dangi <br />3<br />Thought of the day <br /> “If you can imagine it,You can achieve it.If you can dream it,You can become it."<br />
  4. 4. 24/2/07 H Dangi <br />4<br />Scheduling<br />Establishing the timing of the use of equipment, facilities and human activities in an organization<br />Effective scheduling can yield<br />Cost savings<br />Increases in productivity<br />
  5. 5. 24/2/07 H Dangi <br />5<br />Scheduling Activities<br />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 <br />Loading : Assigning specific jobs to each work center for the planning period.<br />Dispatching : final act of releasing job order to the workers to go ahead with production process. <br />
  6. 6. 24/2/07 H Dangi <br />6<br />Dispatching rule <br />Earliest due date <br />Longest processing time <br />Shortest processing time <br />First in , first serve <br />Slack time remaining <br />
  7. 7. 24/2/07 H Dangi <br />7<br />The processing and due time are <br />
  8. 8. 24/2/07 H Dangi <br />8<br />Develop the order in which job are to be processed using <br />EDD<br />LPT<br />SPT <br />FIFS<br />STR<br />
  9. 9. 24/2/07 H Dangi <br />9<br />Question for Discussion <br />
  10. 10. 24/2/07 H Dangi <br />10<br />Compute:<br />EDD<br />LPT<br />SPT <br />FIFS<br />STR<br />
  11. 11. 24/2/07 H Dangi <br />11<br />Scheduling Techniques <br />Gantt charts<br />Johnson’s Job sequencing rule <br />
  12. 12. 24/2/07 H Dangi <br />12<br />Gantt Chart Example<br />
  13. 13. 24/2/07 H Dangi <br />13<br />Johnson’s Rule<br />technique for minimizing completion time for a group of jobs to be processed on two machines or at two work centers.<br />Minimizes total idle time<br />
  14. 14. 24/2/07 H Dangi <br />14<br />Johnson’s Rule Optimum Sequence<br />List the jobs and their times at each work center<br />Select the job with the shortest time<br />Eliminate the job from further consideration<br />Repeat steps 2 and 3 until all jobs have been scheduled<br />
  15. 15. 24/2/07 H Dangi <br />15<br />Example <br />A firm produces six types of fan blades and manufacturing of blade require processing on two machines. Machine A and machine B<br />The processing time of each blade on both machine A and B are given below. <br />
  16. 16. 24/2/07 H Dangi <br />16<br />
  17. 17. 24/2/07 H Dangi <br />17<br />
  18. 18. 24/2/07 H Dangi <br />18<br />Question for Discussion <br />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 <br />
  19. 19. 24/2/07 H Dangi <br />19<br />
  20. 20. 24/2/07 H Dangi <br />20<br />Identify the best sequence using Johnsons Rule <br />
  21. 21. 24/2/07 H Dangi <br />21<br />Ans 3-1-4-5-2<br />
  22. 22. 24/2/07 H Dangi <br />22<br />Queuing Analysis<br />Queuing Analysis involves the study of waiting lines and queuing system <br />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. <br />
  23. 23. 24/2/07 H Dangi <br />23<br />Example <br />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. <br />
  24. 24. 24/2/07 H Dangi <br />24<br />Find :<br />A) utilization ratio<br />B) Average queue length <br />C) Average time spent in system <br />D) waiting time in queue <br />
  25. 25. 24/2/07 H Dangi <br />25<br />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 <br />
  26. 26. 24/2/07 H Dangi <br />26<br />i) Average queue length <br />Ii ) Average no of customer in system <br />Iii ) Utilization ratio<br />
  27. 27. 24/2/07 H Dangi <br />27<br />i) 4/15<br />ii 2/3<br />iii ) 40 %<br />
  28. 28. 24/2/07 H Dangi <br />28<br />Critical ratio Method <br />It is the ratio of actual time remaining and to complete the job and scheduled time remaining to complete the job <br />Critical ratio = Actual time remaining/Scheduled time remaining <br />
  29. 29. 24/2/07 H Dangi <br />29<br />Example <br />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 <br />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 <br />Calculate the critical ratio of each job <br />
  30. 30. 24/2/07 H Dangi <br />30<br />
  31. 31. 24/2/07 H Dangi <br />31<br />Scheduling Service Operations<br />Appointment systems<br />Reservation systems<br />
  32. 32. 24/2/07 H Dangi <br />32<br />Self assessment <br />STR stands for……………..<br />
  33. 33. 24/2/07 H Dangi <br />33<br />Gantt chart was developed by…..<br />
  34. 34. 24/2/07 H Dangi <br />34<br />In queuing model arrival rate is denoted by…..and service rate by……….<br />
  35. 35. 24/2/07 H Dangi <br />35<br />Internet Humor- <br />Q: What is common between : Krishna, Ram, Gandhiji and Jesus..? <br />A: All are born on Government holidays. <br />
  36. 36. 24/2/07 H Dangi <br />36<br />One liner<br />I can't dial 911.. There's no 11 on my phone. <br />7/5th of all people don't understand fractions.<br /> A city is a large community where people are lonely together.<br /> Being politically correct means always having to say you’re sorry. <br />
  37. 37. 24/2/07 H Dangi <br />37<br />Practice Test <br />