Burak Buke (University of Edinburgh)

Fluid networks with parameter uncertainty
Wednesday 11 November 2009 at 15.30, JCMB 6206


The makespan of a fluid network is defined as the time to drain the system, when there is fluid present in the buffers initially. In this presentation, our main focus is minimizing makespan when the problem parameters are uncertain. Assuming distributional information about parameters is available, the decision maker's goal is to optimally allocate the capacity in order to minimize the expected value of the makespan. We consider two decision making schemes. In the first scheme, the controller sets the allocations before observing the parameters. After the initial allocations are set, they cannot be changed. In the second scheme, the controller is allowed a recourse action after a data collection process. It is shown that both schemes differ considerably from the deterministic version of the problem. We formulate both schemes as stochastic programs. The first scheme is easier to solve since the resulting model is convex. Unfortunately, under the second decision scheme, the objective function is non-convex. We develop a branch-and-bound methodology to solve the resulting stochastic non-convex program.

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