1 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 80 patients per hour arrive at a hospital emergency room (ER). All patients first.

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Presentation transcript:

1 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 80 patients per hour arrive at a hospital emergency room (ER). All patients first register through an initial registration process. On average there are 9 patients waiting in the Rg-Buffer. The registration process takes 6 minutes. Patients are then examined by a triage nurse practitioner;m. On average there are 2 patients waiting in the Tr-Buffer in front of the triage process, and the triage classification process takes 6 minutes. On average, 91% of the patients are sent to the Simple-prescription process and the remainder to Hospital-admission. On average, there are 6 patients waiting in the Simple-prescription buffer (Sp-Buffer) in front of this process. A physician spends 6 minutes on each patient in the Simple-prescription process. In addition, on average, 2 patients per hour are sent to the Hospital- admission buffer buffer (Hs-Buffer) after being examined for 6 minutes in the Simple prescription process. On average, 0.9 patients are waiting in the Hospital-admission buffer (Hs- Buffer). A physician spends 25 minutes on each patient in the Hospital-admits process.

2 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 Example Proces Flow and Throughputs

3 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 Example Flow and Throughputs

4 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 Example ProceFlow and Throughputs

5 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 Example Proce Flow and Throughputs

6 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 Average flow time = T = I/R = 43.68/(80/60) = Example Proce Flow and Throughputs

7 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 Micro Method Compute SP and PA first Common = = T SP = = 30.2 Example Proce Flow and Throughputs

8 Ardavan Asef-Vaziri Oct. 2011Operations Management: Waiting Lines 1 T PA1 = = ……(7.2 PA patients out of 9.2 PA patients) T PA2 = = (2 PA patients out of 9.2 PA patients) T PA = 50.12(7.2/9.2) (2/9.2) = T PA = 50.12( ) ( ) =52.5 Recheck T= 30.20(70.8/80) (0.9) (7.2/80) (2) T = Example ProcesFlow and Throughputs