Seminars and Colloquia by Series

Conditional independence models

Series
Other Talks
Time
Monday, March 25, 2013 - 17:00 for 1 hour (actually 50 minutes)
Location
Skiles 006
Speaker
Pedro Rangel – Georgia Tech
(algebraic statistics reading seminar)

General Faculty Meeting

Series
Other Talks
Time
Wednesday, March 13, 2013 - 15:00 for 1 hour (actually 50 minutes)
Location
Skiles 005
Speaker
William Trotter – School of Mathematics, Georgia Tech

Courtesy Listing - The Neuromechanics of Insect Locomotion: How Cockroaches Run Fast and Stably Without (much) Thought

Series
Other Talks
Time
Monday, March 11, 2013 - 15:00 for 1 hour (actually 50 minutes)
Location
Marcus Nano Conf. Room 1116
Speaker
Philip Holmes – Princeton University

Please Note: Host: Turgay Uzer, School of Physics

Annual Joseph Ford Commemorative Lecture: I will describe several models for running insects, from an energy-conserving biped, through a muscle-actuated hexapod driven by a neural central pattern generator, to a reduced phase-oscillator model that captures the dynamics of unperturbed gaits and of impulsive perturbations. I will argue that both simple models and large simulations are necessary to understand biological systems. The models show that piecewise-holonomic constraints due to intermittent foot contacts confer asymptotic stability on the feedforward system, while leg force sensors modulate motor outputs to mitigate large perturbations. Phase response curves and coupling functions help explain reflexive feedback mechanisms. The talk will draw on joint work with Einat Fuchs, Robert Full, Raffaele Ghigliazza, Raghu Kukillaya, Josh Proctor, John Schmitt, and Justin Seipel. Research supported by NSF and the J. Insley Blair Pyne Fund of Princeton University.

Oral Examination: "Invariant Densities for Dynamical Systems with Random Switching"

Series
Other Talks
Time
Tuesday, March 5, 2013 - 16:30 for 1 hour (actually 50 minutes)
Location
Skiles 006
Speaker
Tobias Hurth – Georgia Institute of Technology, School of Mathematics –
On a smooth manifold, we consider a non-autonomous ordinary differential equation whose right side switches between finitely many smooth vector fields at random times. These switching times are exponentially distributed to guarantee that the resulting random dynamical system has the Markov property. A Hoermander-type hypoellipticity condition on a recurrent subset of the manifold is then sufficient for uniqueness and absolute continuity of the invariant measure of the Markov semigroup. The talk is based on a paper with my advisor Yuri Bakhtin.

Courtesy Listing - Health and Wealth

Series
Other Talks
Time
Monday, March 4, 2013 - 17:00 for 1 hour (actually 50 minutes)
Location
Scheller College of Business, LeCraw Auditorium
Speaker
Ken Arrow – Stanford University, Emeritus

Please Note: Hosted by the College of Computing Light refreshments served at 4:30 PM

You are cordially invited to "Health and Wealth," a distinguished lecture by Nobel Laureate Ken Arrow that will provide a policy guide for matters of health, public and private. Professor Arrow, Joan Kenney Professor of Economics and Professor of Operations, Emeritus, at Stanford University, will address longevity and other aspects of health as commodities, as well as their trade-off with more usual goods as important measures of the well-being of nations. Register: http://www.formdesk.com/collegeofcomputing/KenArrow

Geometric combinatorics, graphs and hypergraphs

Series
Other Talks
Time
Monday, February 25, 2013 - 11:05 for 1 hour (actually 50 minutes)
Location
Skiles 005
Speaker
Gil Kalai – Hebrew University and Yale University
In the lecture I will describe how several questions in geometric combinatorics translate into questions about graphs and hypergraphs. 1. Borsuk's problem. 2. Tverberg theorem and Tverberg's type problems. Tverberg's theorem asserts that (r-1)(d+1)+1 points in d-space can be divided into r parts whose convex hull intersect. I will discuss situations where less points admit such a partition and connections with graph theory. (For more background, look at this MO question Tverberg partitions with less than (r-1)(d+1)+1 points<http://mathoverflow.net/questions/88718/tverberg-partitions-with-less-than-r-1d11-points> ) 3. Helly type theorems and conditions on induced subgraphs and sub-hypergraphs. I will explain the origin to the following conjecture of Meshulam and me: There is an absolute upper bound for the chromatic number of graphs with no induced cycles of length divisible by 3. 4. Embedding of 2-dimensional complexes and high dimensional minors. I will discuss the following conjecture: A 2-dimensional simplicial complex with E edges and F 2-dimensional faces that can be embedded into 4-space satisfies F < 4e. (For more background see my post *F ≤ 4E*<http://gilkalai.wordpress.com/2013/02/01/f-4e/> )

Georgia Scientific Computing Symposium

Series
Other Talks
Time
Saturday, February 23, 2013 - 08:30 for 8 hours (full day)
Location
Georgia State University
Speaker
Georgia Scientific Computing Symposium – Georgia State University
The purpose of the GSC Symposium is to provide an opportunity for professors, postdocs, and graduate students in the Atlanta area to meet in an informal setting, to exchange ideas, and to highlight local scientific computing research. Certainly, the symposium is open to whole mathematics and computer sciences communities. The previous meetings were held at Emory University (2009), Georgia Institute of Technology (2010), Emory University (2011) and University of Georgia (2012). The 2013 GSC Symposium will be held at the Georgia State University campus and is organized by Alexandra Smirnova and Vladimir Bondarenko in the Department of Mathematics and Statistics, Georgia State. The following researchers have agreed to give invited plenary lectures: Hao Gao, Department of Mathematics and Computer Science, Department of Radiology and Imaging Sciences, Emory University; Guillermo Goldsztein, School of Mathematics, Georgia Institute of Technology; Yi Jiang, Department of Mathematics and Statistics, Georgia State University; Caner Kazanci, Department of Mathematics, University of Georgia; Brani Vidakovic, College of Engineering, Georgia Institute of Technology. There will be poster sessions. Anyone attending this symposium may present a poster. We especially encourage graduate students and postdocs to use this opportunity displaying their research results. Please register at the Symposium website.

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