Question. Consider a single-server system where there can be at most two customers in the system (including the one being served). In each hour, a new customer enters to the system with probability % unless there are already 2 customers in the system. Assume that new arrival occurs at the end of each hour.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 32E
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Question. Consider a single-server system where there can be at most two customers in the system
(including the one being served). In each hour, a new customer enters to the system with probability
% unless there are already 2 customers in the system. Assume that new arrival occurs at the end of
each hour.
At the beginning of each hour, the server can decide a configuration if there is a customer in the
system. If the configuration is fast, with probability 0.7, one customer is served and it leaves the system
in a given hour. On the other hand, if the configuration is slow, this probability decreases to 0.4. 80 TL
revenue is obtained for each customer whose service is completed. The costs of slow and fast
configurations are 10 and 15 TL per hour, respectively. The hourly discount rate is B=0.8.
We would like to maximize the total expected discounted profit over an infinite horizon.
Formulate the problem as MDP model by defining states, decision sets, transition
probabilities and expected rewards clearly.
Find the optimal policy using Policy Iteration where the initial policy is to use fast
configuration whenever there is at least one customer in the system.
a.
b.
C.
Develop an LP model for the MDP. Assume that you have solved the LP optimally.
What is the optimal solution, which constraints in your model are binding and why? (Do not
solve the LP model; you can determine the binding constraints by observing the optimal
solution found in part b).
Transcribed Image Text:Question. Consider a single-server system where there can be at most two customers in the system (including the one being served). In each hour, a new customer enters to the system with probability % unless there are already 2 customers in the system. Assume that new arrival occurs at the end of each hour. At the beginning of each hour, the server can decide a configuration if there is a customer in the system. If the configuration is fast, with probability 0.7, one customer is served and it leaves the system in a given hour. On the other hand, if the configuration is slow, this probability decreases to 0.4. 80 TL revenue is obtained for each customer whose service is completed. The costs of slow and fast configurations are 10 and 15 TL per hour, respectively. The hourly discount rate is B=0.8. We would like to maximize the total expected discounted profit over an infinite horizon. Formulate the problem as MDP model by defining states, decision sets, transition probabilities and expected rewards clearly. Find the optimal policy using Policy Iteration where the initial policy is to use fast configuration whenever there is at least one customer in the system. a. b. C. Develop an LP model for the MDP. Assume that you have solved the LP optimally. What is the optimal solution, which constraints in your model are binding and why? (Do not solve the LP model; you can determine the binding constraints by observing the optimal solution found in part b).
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