311_Session12

311_Session12 - Operations Management Session 12: Waiting...

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Unformatted text preview: Operations Management Session 12: Waiting Lines Session 12 Operations Management 2 Previous Class Make sure to have your teams registered for the simulation game by tomorrow! 1 point off your final grade for every day your team is late registering. Understanding the phenomenon of waiting Impact of variability/uncertainty & utilization rate Session 12 Operations Management 3 Objectives Guidelines for the West Coast Case analysis due Tuesday 3/3. Classification of the waiting-line systems Formula/macro for waiting-line calculation M/M/1 formulas Excel Macro General approximation formula. Practice problems. Session 12 Operations Management 4 West Coast Case Analysis 1 (Added slide to what was posted) Section 1. Short summary of the problem. (I also read the case I do not need 2 or more pages re- stating what the case says!) Section 2. Capacity. Is there enough capacity? Specifically, are there enough weekly Dr. and nurse hours to satisfy patient demand? Do you recommend hiring more Doctors and/ or nurses? Session 12 Operations Management 5 West Coast Case Analysis 2 (Added slide to what was posted) Section 3. Waiting times. To have an idea of what the waiting times can be, assume: 1. Arrivals across days and hours are similar and doctors and nurses are scheduled evenly throughout the week and day. 2. All patients are walk-ins, and are willing to see the firs physician available. (No one cares about personalized service.) 3. Inter-arrival and service times are exponential. Then, you have an M/M/s queueing model for each hour Session 12 Operations Management 6 West Coast Case Analysis 3 (Added slide to what was posted) Section 4. Your scheduling recommendations. Can you propose a better schedule for the physicians? What happens if you place more emphasis on the patients having more personalized service? Suppose each patient is assigned to a small team of physicians, and can only be seen by a physician on that team. Will waiting times increase or decrease? Session 12 Operations Management 7 Terminology and Classification of Waiting Lines Terminology : The characteristics of a queuing system is captured by five parameters: Arrival pattern Service pattern Number of server Restriction on queue capacity The queue discipline Session 12 Operations Management 8 Terminology and Classification of Waiting Lines M/M/1 Exponential interarrival times Exponential service times There is one server.There is one server....
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311_Session12 - Operations Management Session 12: Waiting...

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