Clark School Home UMD

ISR News Story

New DoE grant for AndréTits, Dianne O'Leary

Professor AndréTits (ECE/ISR) is the principal investigator and Professor Dianne O’Leary (CS/UMIACS) is the co-PI for a new Department of Energy grant, “Advanced Optimization Techniques for Entropy-Based Moment Closures.” The University of Maryland portion of the three-year grant is funded at $769,918, and the work is being done in collaboration with Dr. Cory Hauck of the Oak Ridge National Laboratory.

The research team will design and implement advanced convex optimization methods for solving entropy maximization problems. In transport and kinetic theory, solutions to these problems are used to derive closures for moment models that inherit many fundamental features of kinetic transport. Specific applications include gas dynamics, radiative transfer, charged-particle transport, and neutron transport.

The natural approach to solving the entropy maximization problem is via the solution of the dual problem--a finite-dimensional, strictly convex problem, known to have a unique solution. The researchers will investigate novel optimization algorithms for three problem cases: an unconstrained case, a constrained case, and what amounts to an “intermediate case.” Their tools include globally convergent variants of Newton's method, recent interior-point methods which exploit the conic nature of the feasible set, and the extension of new reduced constraint methods from linear to general convex optimization.

Algorithms will be implemented as local computations in parallel PDE solvers and the accuracy, efficiency, and practicality of entropy-based closures in realistic settings will be determined. This analysis includes (i) the use of multi-level preconditioning for increased efficiency and (ii) sensitivity analysis to determine the choice of moments that, based on user-defined criteria, leads to an efficient calculation.

September 16, 2009


Prev   Next

 

 

Current Headlines

Czech Republic–United States Workshop on Artificial Intelligence held at UMD

Feathers Not Included

Pines Receives UMD President's Medal

Sennur Ulukus receives NSF grant to address important data-related medical device issue

NSF grant for Ghodssi, Bentley furthers research of flexible devices to combat biofilms

Oct. 4 event features Michele Gelfand, research colleague of Dana Nau

Fermuller, Shamma, Etienne-Cummings receive NSF grant for 'Research Coordination Network'

Alumnus Omur Ozel joins George Washington University as tenure-track faculty

Lu, Gollob, Picard win ISR annual awards

Five recipients of ISR Graduate Student Travel Award announced

News Resources

Return to Newsroom

Search News

Archived News

Events Resources

Events Calendar