Upcoming seminars

Upcoming Seminars
Tue
11/03/2009
(today)
4:00pm
Defense: Numerical Analysis and Scientific Computing
High Performance Java Software for Image Processing
Piotr Wendykier, Emory University
Contact: Piotr Wendykier, piotr.wendykier@emory.edu
Venue: Mathematics and Science Center, Room W201
Parallel computing has been used for scientific computing applications since the 1960s, when the first supercomputers were developed. However, only recently have these programming paradigms become useful for software running on desktop and notebook computers. In this dissertation we demonstrate the advantage of exploiting modern computer architectures in scientific computing with multithreaded programming in Java for applications in image processing. A significant contribution of this work is an open source, multithreaded high performance scientific computing Java library called Parallel Colt. In addition, on top of Parallel Colt, we have implemented six ImageJ plugins for deconvolution, super resolution, fast Fourier transforms and image cropping. Hence, we are able to provide software to solve important problems in real image processing applications, and which can effectively make use of multi-core CPUs available on affordable desktop and notebook computers.
Fri
11/06/2009
(in 3 days)
3:00pm
Seminar: Topology
What is symmetric homology?
Zbigniew Fiedorowicz, The Ohio State University
Contact: R. Parimala, parimala@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W303
We outline the general development of a theory of symmetric homology of algebras, an analog of cyclic homology where the cyclic groups are replaced by symmetric groups. This theory is developed using the framework of crossed simplicial groups and the homological algebra of module-valued functors. The symmetric homology of group algebras is related to stable homotopy theory. Two spectral sequences for computing symmetric homology are constructed. The $E_1$ term of one of these relates to a new class of geometric complexes for Coxeter groups. Many open questions remain.
Fri
11/06/2009
(in 3 days)
4:00pm
Seminar: Combinatorics
Two problems in asymptotic combinatorics
Rod Canfield, The University of Georgia
Contact: Dwight Duffus, dwight@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W306
Fri
11/06/2009
(in 3 days)
4:15pm
Seminar: Algebra
Pseudo-reductive groups
Gopal Prasad, University of Michigan
Contact: R. Parimala, parimala@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W303
A pseudo-reductive group is a smooth connected affine algebraic group over a field k which does not contain any nontrivial smooth connected normal unipotent subgroups defined over k. Such groups arise naturally as the quotient of any smooth connected affine algebraic k-group by the maximal smooth connected normal unipotent subgroup defined over k. For study of general affine algebraic groups it is important to know the structure and classification of pseudo-reductive groups. In a joint work with Brian Conrad and Ofer Gabber we have determined the structure and classification of these groups. In my talk I will explain the classification, and also mention group theoretic and arithmetic applications.
Tue
11/10/2009
(in 7 days)
4:00pm
Seminar: Algebra
Lattices, sphere packings, spherical codes, and energy minimization
Abhinav Kumar, MIT
Contact: R. Parimala, parimala@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W303
It is a classical problem in geometry to find the densest sphere packing in n-dimensional Euclidean space. Analogous problems of packing among lattices, or on compact spaces such as the sphere or Hamming space, are widely studied in number theory, discrete geometry, coding theory and combinatorics. I will talk about some recent work which puts these problems in the framework of potential energy minimization. This leads to experimental and theoretical techniques to approach these optimization problems (and their inverse problems), and leads to some surprising new results in high dimensions.
Wed
11/11/2009
(in 8 days)
12:45pm
Seminar: Numerical Analysis and Scientific Computing
Computational and Statistical Methods for Positron Emission Tomography
Johnathan Bardsley, Department of Mathematical Sciences, University of Montana
Contact: James Nagy, nagy@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W306
I'll spend a fair amount of time discussing the mathematical models behind the CT (computed tomography) and PET (positron emission tomography) imaging modalities, with the goal of bringing the audience along for as much of 50 minutes as possible. At some point, however, I'll dive into my own research focusing on the PET imaging problem, which includes iterative methods, as well as the choice of the regularization function and parameter.\\ \\ Anyone curious about how these standard medical imaging techniques work is encouraged to attend.
Fri
11/13/2009
(in 10 days)
3:00pm
Seminar: Computer Science
TBD
John Stasko, Georgia Tech, College of Computing
Contact: James J. Lu, jlu@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W301
Wed
11/18/2009
(in 15 days)
4:00pm
150th anniversary of the Riemann Hypothesis: Celebration of the
Riemann's zeros and the rhythm of the primes
David Borthwick, Emory University
Contact: Skip Garibaldi, skip@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W201
Fri
11/20/2009
(in 17 days)
3:00pm
Seminar: Computer Science
Automatic Modeling of Procedural Knowledge and Feedback Generation in Tutoring System for Computer Science
Davide Fossati, Georgia Tech, College of Computing
Contact: James J. Lu, jlu@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W301
Tue
12/01/2009
(in 28 days)
4:00pm
Seminar: Algebra
Title to be announced
Patrick Corn, Emory University
Contact: Skip Garibaldi, skip@mathcs.emory.edu
Venue: Mathematics and Science Center, Room W303
Wed
12/02/2009
(in 29 days)
4:00pm
Graduate Student Seminar
Title to be announced
Skip Garibaldi, Emory University
Contact: Pascal Philipp, pphilip@emory.edu
Venue: Mathematics and Science Center, Room W201