Inventory Management - Mod. D
5 important questions on Inventory Management - Mod. D
Which 3 types of queuing models do you have? And to what do the letters refer?
- Simple (M/M/1)
- Example: info loketje op station
- Multi-channel (M/M/S)
- Example: airline ticket counter
- Constant service (M/D/1)
- Automated car wash
Arrival process/service process/service channels
M: memory less: geen geheugen, Poisson verdeling.
D: determined, altijd een bepaalde tijd.
1: 1 server
S: meerdere servers
What are the 5 steps to solve a typical queuing model exam question?
- Identify the appropriate(=passende) waiting line model (type of queuing model)
- Determine labda and mu (and S if appropriate)
- Identify the appropriate performance measure
- Find the correct formula in the appendix
- Fill out the formula
How do you calculate the probability of 0 units in system (i.e. System idle(=inactief)?
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What is the relation between Wq&Ws and Lq&Ls?
- Wq= Ws - 1/mu
- Lq= Ls - labda/mu
See continuation of example in picture.
VERGEET NIET UNIT/EENHEID ERBIJ TE ZETTEN.
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