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Seminar: Episodic History of Calculations for Exterior Ballistics
Joseph Grcar, Lawrence Berkeley (Retired)
April 7, 2016, 12:10-1:30 PM
Mathematical Sciences Building, Room 2112
Abstract: Exterior ballistics studies the trajectories of bullets and artillery shells, or in Leonard Euler's phrase, the path of an object thrown into the air. Military technologists predicted trajectories using Isaac Newton's model of a point-mass with aerodynamic drag from Euler in 1753 to ENIAC in 1946. For this purpose they invented various computing methods: ballistic tables, numerical integration, differential analyzers, and finally electronic computers. Indeed, the United States supported inventing computers precisely to construct artillery firing tables in the second World War. Beyond the many fascinating historical events, this long period offers a test for understanding the history of engineering technology. I propose a concept of episodic change in the history of engineering analogous to the paradigm shifts in the history of science.
Seminar: On Solving Trust-Region Subproblems
Johannes Brust, UC Merced
March 9, 2016, 4:10-5:00 PM
Mathematical Sciences Building, Room 2240
Abstract: The problem of minimizing a vector valued scalar objective function can be approached with a Trust-Region algorithm. This method is based on minimizing Taylor approximations of the objective function subject to a constraint. These constrained problems are the so called Trust-Region subproblems. Our focus is on solving the subproblem when the number of unknowns is large, and the 2nd derivative matrix of the objective function is difficult to compute.
Gregory Ihrie, U.S. Department of Defense
February 26, 2016
Mathematical Sciences Building, Room 1147, 11:00 AM-12:00 PM
Math Career Talk/Discussion
Mathematical Sciences Building, Room 1147, 12:00-1:00 PM
An informal discussion about mathematical careers at the Department of Defense. Snacks will be provided, and graduate students are especially encouraged to attend. Internship opportunities will be discussed.
Tamara G. Kolda, Sandia National Laboratories
February 4, 2016
Seminar: Optimization Challenges in Tensor Factorization
Mathematical Sciences Building, Room 2112, 11:00 AM-12:00 PM
Abstract: Tensors are multiway arrays, and tensor decomposition is a powerful tool for compression and data interpretation. In this talk, we demonstrate the utility of tensor decomposition with several examples and explain the optimization challenges, both theoretical and practical. The optimization problems are nonconvex, but they can typically be solved via an alternating approach that yields convex subproblems. We consider open problems such as determining the model complexity, tensor completion, incorporating symmetries and other constraints, handling ambiguities in scaling and permutation, enforcing structure like sparsity, and considering alternative objective functions.
Applied Math Career Talk/Discussion
Mathematical Sciences Building, Room 2112, 2:00-3:00 PM
An informal, joint session with the weekly department tea; snacks and drinks provided as always.
Davis SIAM Round-table on Summer Internships, Workshops, and Extra-Academic Experiences
October 13, 2015
Mathematical Sciences Building, Room 1147, 2:10-3:00 PM
The first annual Davis SIAM Round-table on Summer Internships, Workshops, and Extra-Academic Experiences was held on October 13th, 2015. At the event several grads discussed a variety of summer opportunities they had pursued. Some of the opportunities included public internships at the NSA and Lawrence Livermore Laboratory, as well as private internships at NASA and Smule, a bay area audio app designer. The event was designed to generate awareness of summer opportunities available outside of academia. To view pictures of the event, check out the Photo Gallery.
Davis SIAM Student Research Conference (DSSRC)
One of the largest events the SIAM chapter has organized in past years is the Davis SIAM Student Research Conference (DSSRC) which took place in the Spring Quarter at UC Davis. The conferences provided an opportunity for students to promote their research in either a talk or poster session format.