Queues

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Operational and Decision Making tools presentation on queuing models.

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Queues

  1. 1. Queuing Model Operational and Decision Making Tools By: Chizhova Daria Prof.: Tara Doubman Date: 6.06.13
  2. 2. What is queuing theory? O Analysis of queuing lines in Manufacturing and Service O waiting-line length O average waiting time - Service system - Maintenance activities - Shop-floor control activities
  3. 3. Characteristics of a Waiting Line (I) O Arrivals or Inputs to the system Limited Size Unlimited Balk Reneging Behaviour Patient Schedule Pattern Randomly
  4. 4. Characteristics of a Waiting Line (II) O Waiting-Line Characteristics O Length is LIMITED or UNLIMITED O Queue Discipline - FIFO
  5. 5. Characteristics of a Waiting Line (III) O Service Characteristics F O Design of the Service System O Single-channel queuing system F O Multichannel queuing system F O Single-channel Multiphase O Multichannel Multiphase F F F F F F
  6. 6. Measuring Queues Performance O Average time each customer spends in O O O O O O the queue Average queue length Average time customer spends in system Average number of customers in system Probability of facility being idle Utilization factor for the system Probability of specific number of customers in the system
  7. 7. Examples (I) Easyjet and Airports O Speedy Boarding O Online check-in – closing the registration desks in the airports O Example in Airports – Self-checking Machines O S- shaped queues
  8. 8. Examples (II) Disneylands and Hotels O Fast-Pass O Changing the perception of queues O Using Ipad with Scanners installed
  9. 9. Queuing Theory O http://www.youtube.com/watch?v=F5Ri_H hziI0
  10. 10. Thanks for Attention!

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