SCM 424 Lecture Notes - Lecture 2: Standard Deviation, Factory Physics
15 Sep 2016
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Know how to apply them and be aware of them- not just word for word know. 1: perfect system, no variability (variability meaning everything is exactly the same) How do we measure variability: standard deviation: which tells you how much of a deviation there is from an average, range: max- min, co-efficient of variation or cv: std. If things are coming in quicker than there is capacity for, the queue will grow. Stable system can have a queue but must balance it. 3: as long as there is a stable system, whatever comes in is equal to whatever goes out. Not the case when : there are defects, there are reused parts. Has an implication what comes in is your arrival rate. Arrival rate must be < than throughput time for stable system. Increasing exponentially because higher variability means that it"s more spread out and processing time. There is a queue that is caused by variability.
