Dissertation Defense: Martin Vieten @ UW-Milwaukee Mathematical Sciences, Milwaukee [13 March]

Dissertation Defense: Martin Vieten

12:30 - 14:00

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UW-Milwaukee Mathematical Sciences
EMS Building, Room E403; 3200 N Cramer St, Milwaukee, Wisconsin 53211
UW-Milwaukee Department of Mathematical Sciences presents,

Martin Vieten;
University of Wisconsin-Milwaukee
PhD Graduate Student

Tuesday, March 13, 2018
12:30PM in EMS Building, E495

Numerical Solution of Stochastic Control Problems Using the Finite Element Method

The linear programming approach to stochastic control has provided insight on a wide variety of control problems, including singular control and optimal stopping. The specification of the dynamics in the linear programming set up is given by an operator-integral equation for the occupation measures of the controlled process. This structure can be exploited to establish a numerical approximation scheme by borrowing ideas from the finite element method. Research by Kaczmarek, Rus et. al. has indicated strong numerical performance of such an approximation, but failed to provide a complete convergence argument.
This thesis presents an adjusted finite element approximation scheme for the linear programming approach in stochastic control, and shows its convergence for models featuring an infinite time horizon, with either a bounded or unbounded state space, and singular behavior. Both the optimization of controls as well as the evaluation of cost criteria for fixed controls are analyzed. The performance of the method is illustrated with several examples, including the classic `Modified Bounded Follower’, which has an analytic solution, models from finance, and more.

Profs. Richard Stockbridge (Advisor); Gerhard Dikta, Bruce Wade, Lei Wang, & Chao Zhu
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