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M / M / 1 / GD / / (Section 4)

M / M / 1 / GD / / (Section 4). Steady-state condition:. Little’s queuing formula This is independent of number of servers, queue discipline, interarrival time dist., service time dist. IE 417, Chap 22, April 99. Burger-417 Fast-Food

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M / M / 1 / GD / / (Section 4)

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  1. M / M / 1 / GD / /(Section 4) Steady-state condition: Little’s queuing formula This is independent of number of servers, queue discipline, interarrival time dist., service time dist. IE 417, Chap 22, April 99

  2. Burger-417 Fast-Food = 45#/hr = 0.75#/min = 60#/hr = 1#/min Based on solution on web. 1 teller 1 teller & cashier 2 tellers = 1 = 1.25 = 1 Lq# 2.25 0.9 0.12 L # 3 1.5 0.87 Wqmin 3 1.2 0.16 W min 4 2 1.16 0.75 0.6 0.38 0.25 0.4 0.45 Pw 0.75 0.6 0.20 P(j 5) 0.24 0.08 0.01 1 IE 417, Chap 22, May 99

  3. Different Types of Costs in Queuing Systems Loss in goodwill = ($/part) C Waiting time = ($/unit time) Cost of space = ($/part) Lq Loss of customer = ($/part) IE 417, Chap 22, April 99

  4. M / M / 1 / GD / C /(Section 5) For j = 1, …., C For j = 0, …., C For j = C+1, …., IE 417, Chap 22, May 99

  5. M / M / S / GD / /(Section 6) Steady-state condition: For j = 1, 2, …, S For j = S+1, S+2, …, Probability that an arriving unit has to wait: Table 6 page 1088 IE 417, Chap 22, May 99

  6. M / M / S / GD / /(Section 6) Cont. IE 417, Chap 22, May 99

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