Transportation and logistics modeling 3

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Transportation and logistics modeling 3

  1. 1. Introduction to Modeling<br />
  2. 2. A bank<br />Customers arrive at a bank<br />The inter-arrival time is recorded<br />Customers wait there turn in the waiting area<br />Customers are served on the first come first served basis<br />When his turn comes, the customer moves to the teller<br />The service time is recorded<br />The customer leaves after he got serviced<br />
  3. 3. Basic Elements<br />We need to define the following:<br />Entity<br />Items processed in the system<br />Arrival<br />How often entities arrive<br />Location<br />Places where entities are held or processed<br />Resources<br />Agents used in the processing of entities<br />Path<br />The course of travel for entities and resources in the system<br />
  4. 4. Logic building<br />Several choice:<br />Unified Modeling Language (UML)<br />Outline process map<br />Six symbols to represent the process<br />The symbols can be used to extract further information<br />
  5. 5. Outline Process Map<br />Process: an action performed on an Entity<br />Handling: movement of an entity using resources<br />Inspection: Revision or test of an Entity<br />Delay: Some time spent in waiting<br />Transportation: Movement of the entity from one location to another<br />Storage: Long time waiting<br />Decision: When there are several choices or options<br />
  6. 6. Outline Process Map<br />Customers arrive at the bank<br />Customer moves to tellers<br />Customer Exits <br />Customer gets serviced <br />Customers wait in the waiting area (queue) for their turn<br />Teller Area<br />Waiting Area<br />
  7. 7. Entities<br />Customers arrive at the bank<br />Customer moves to tellers<br />Customer Exits <br />Customer gets serviced <br />Customers wait in the waiting area (queue) for their turn<br />Teller Area<br />Waiting Area<br />Each line in process map is considered an entity.<br />Entities here are customers.<br />
  8. 8. Arrival<br />Customers arrive at the bank<br />Customer moves to tellers<br />Customer Exits <br />Customer gets serviced <br />Customers wait in the waiting area (queue) for their turn<br />Teller Area<br />Waiting Area<br />The rate of arrival of each entity in the system<br />
  9. 9. Stat::fit<br />Choose file-open then choose files of type data files (*.txt)<br />Or Insert the data here<br />
  10. 10. Stat::fit<br /><ul><li>Choose continuous or discrete
  11. 11. Choose whether the distribution is
  12. 12. Unbounded (no upper or lower limit)
  13. 13. Lower bound
  14. 14. Assigned bound (you specify the lower bound)</li></li></ul><li>Stat::fit<br />Choose assigned bound and specify the lower bound as 0.<br />
  15. 15. Stat::fit<br />
  16. 16. Locations<br />Customers arrive at the bank<br />Customer moves to tellers<br />Customer Exits <br />Customer gets serviced <br />Customers wait in the waiting area (queue) for their turn<br />Teller Area<br />Waiting Area<br />Two locations:<br />Waiting Area and Teller Area<br />Waiting area is a QUEUE  Specify waiting rule<br />
  17. 17. Recourses<br />Customers arrive at the bank<br />Customer moves to tellers<br />Customer Exits <br />Customer gets serviced <br />Customers wait in the waiting area (queue) for their turn<br />Teller Area<br />Waiting Area<br />Resources are the equipments used in handling, or workers used to perform processes on entities.<br />The resources here are the clerks serving customers.<br />
  18. 18. Paths<br />Customers arrive at the bank<br />Customer moves to tellers<br />Customer Exits <br />Customer gets serviced <br />Customers wait in the waiting area (queue) for their turn<br />Teller Area<br />Waiting Area<br />Only relevant when the transportation time is important.<br />
  19. 19. Modeling<br />For each entity, :<br />From arrival to departure, define the following for each entity:<br />What does the entity do at each location?<br />Then, where does it go?<br />Customers arrive at 2 locations<br />At each location define what they do at the location<br />Where to go after the process<br />
  20. 20. Processing<br />At Waiting area<br />What to do:<br />Wait his turn<br />Where to go:<br />To the teller<br />At the Teller<br />What to do:<br />Get serviced<br />Where to go:<br />Exit the system<br />
  21. 21. The Complete Model<br />Entities:<br />Customer<br />Locations<br />Waiting area (Queue)<br />Teller desk<br />Resources<br />Clerk(s)<br />Networks<br />Irrelevant as we don’t need to analyze transportation time, otherwise it should be included<br />Processing<br />Customer @ waiting area does not do any processes<br />Customer then goes to teller<br />Customer @ teller waits until the end of the service<br />Customer then leaves<br />
  22. 22. Manual Simulation<br />No customers in bank <br />Clerk is idle <br />First arrival at time 3.2<br />

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