This page contains a list of Mathematics and Computer Science seminars for the current semester. Links to previous semesters can be found at the bottom of the page.

DATE	SPEAKER	TITLE
Thu Sep 8	Darrin Speegle	"A redundant version of the Rado-Horn Theorem"
Abstract: The Rado-Horn Theorem gives a characterization of those sets of vectors which can be written as the union of a fixed number of linearly independent sets. In this talk, we discuss the redundant case. We show that the span of the vectors can be written as the direct sum of a subspace which directly fails the Rado-Horn criteria and a subspace for which the Rado-Horn criteria hold. As a corollary, we characterize those sets of vectors which, after the deletion of a fixed number of vectors, can be written as the finite union of a fixed number of linearly independent sets. This is joint work with P. Casazza and G. Kutyniok. Preprints of the paper are available at http://euler.slu.edu/Dept/Faculty/speegled/research.html Note: The department plans to stream the algebra seminar live across the internet (as a test for future use). Information is available on the web page http://sylow.slu.edu/broadcasts/computer.html
Thu Sep 15	Greg Marks	"A counterexample in annelidan rings."
Thu Sep 22	Greg Marks	"A counterexample in annelidan rings. Part II. "
Thu Sep 29	Jim Riles	"Finitely presented soluble groups"
Abstract: Jim Riles will lead our continuing workshop "Finitely presented soluble groups," following an exposition by R. Strebel, which highlights a theory of geometric invariants that determine the structure of finitely generated groups in certain varieties. This talk will be largely self-contained, independent of prior talks in this series.
Thu Oct 6	Jim Riles	Workshop: "Finitely presented soluble groups,"
Abstract: Continuing our workshop "Finitely presented soluble groups," following an exposition by R. Strebel, which highlights a theory of geometric invariants that determine the structure of finitely generated groups in certain varieties.
Thu Oct 13	Julianne Rainbolt	Weyl groups and Coxeter elements
Abstract: This talk will define and describe the Weyl group of a finite group of Lie type. The standard example when G=GL(n,q) will be discussed as well as the example when G=U(n,q). Included will be an examination of some relationships between the Weyl groups of GL(n,q) and U(n,q) including their Coxeter elements
Thu Oct 20	Julianne Rainbolt	Weyl groups and Coxeter elements. Cont'd
Thu Oct 27	Julianne Rainbolt	Weyl groups and Coxeter elements. Cont'd
Thu Nov 3	Julianne Rainbolt	Weyl groups and Coxeter elements. Cont'd
Thu Nov 10	Jim Riles	"Finitely presented soluble groups"
Abstract: Jim Riles will lead our continuing workshop "Finitely presented soluble groups," following an exposition by R. Strebel, which highlights a theory of geometric invariants that determine the structure of finitely generated groups in certain varieties.
Thu Nov 17	Jim Riles	"Finitely presented soluble groups"
Abstract: Jim Riles will lead our continuing workshop "Finitely presented soluble groups," following an exposition by R. Strebel, which highlights a theory of geometric invariants that determine the structure of finitely generated groups in certain varieties.
Thu Dec 1	Jim Riles	"Finitely presented soluble groups"
Abstract: Jim Riles will lead our continuing workshop "Finitely presented soluble groups," following an exposition by R. Strebel, which highlights a theory of geometric invariants that determine the structure of finitely generated groups in certain varieties.
Thu Dec 8	Jim Riles	"Finitely presented soluble groups"
Abstract: Jim Riles will lead our continuing workshop "Finitely presented soluble groups," following an exposition by R. Strebel, which highlights a theory of geometric invariants that determine the structure of finitely generated groups in certain varieties.
Abstract:

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Analysis Seminar
Tuesdays, 3:00 - 3:50 in Ritter Hall 202

DATE	SPEAKER	TITLE
Fri Oct7	Kasso Okoudjou of Cornell University	"On some Fourier multipliers for modulation spaces"
Special Time: 2:30-3:30 pm MDDH 1016 Abstract: In this talk, I will use some time-frequency analysis techniques to study the continuity propeprties of a class of Fourier multipliers on the modulation spaces. In particular, I will consider Fourier multipliers related to certain evolution equations, and which are known to be unbounded on Lebesgue spaces.
Tue Oct 11	Darrin Speegle	"Harmonic Analysis in Phase Space"
Abstract: We will begin the year with a workshop on Folland's book "Harmonic Analysis in Phase Space"; the presenter for the first two meetings will be Darrin Speegle.
Tue Oct 18	Darrin Speegle	"Harmonic Analysis in Phase Space"
Special Time: 2:00 - 2:50 Abstract: A workshop on Folland's book "Harmonic Analysis in Phase Space". Continued from last week.
Tue Nov 1	Darrin Speegle	"Harmonic Analysis in Phase Space"
Abstract: A workshop on Folland's book "Harmonic Analysis in Phase Space". Continued from last time.
Tue Nov 8	Darrin Speegle	"Harmonic Analysis in Phase Space"
Abstract: A workshop on Folland's book "Harmonic Analysis in Phase Space". Continued from last time.
Tue Dec 6	Darrin Speegle	"Harmonic Analysis in Phase Space"
Abstract: A workshop on Folland's book "Harmonic Analysis in Phase Space". Continued from last time.

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Computer Science Seminar
Mondays, 3:00 - 3:50 in Ritter Hall 202

DATE	SPEAKER	TITLE
Mon Oct 17	Jason Fritz	"A Meta-Learning Framework for Improving Segmentation Evaluation"
Abstract: Object segmentation is a fundamental early step in many target recognition systems. A good segmentation of the object(s) from the optical image or sensor data greatly increases recognition accuracy. Many image segmentation methods have been used, but there is still no satisfactory means for measuring the effectiveness of these various methods. The lack of a good evaluation measure makes it hard to compare different segmentation methods, or even different parameterizations of a single method, thus hindering further improvements in the accuracy of recognition systems. It is well known that evaluating the effectiveness of object segmentation is a hard problem. Oftentimes, segmentation effectiveness is judged solely on the recognition rate of the imaging system, which is inaccurate because the performance of the segmentation itself is not necessarily directly correlated with overall system performance. A few standalone evaluation methods have been proposed, but these techniques examine different fundamental criteria, or examine the same criteria in varying ways. Consequently, these methods work well in some cases, but poorly in the others. Using machine learning methods, we can determine the circumstances under which the various metrics perform well versus when they perform poorly, and thereby leverage the appropriate evaluators’ quality measures to achieve reliable evaluation results. Consequently, we propose a meta-learning framework for segmentation evaluation, in which different effectiveness measures judge the segmentation performance according to their various criteria, and then a meta-learner coalesces the results to generate an overall effectiveness score based on the image characteristics. This co-evaluation framework is being targeted for dual-use, so segmentation evaluation results will be presented across a variety of single- and multi-spectral images in both the military and commercial domains.
Mon Nov 21	Mark Pedigo	An Online Scheduling Algorithm for Non-Preemptive, Equal-Length Jobs Using Two Identical Machines
Abstract: We present an online algorithm which schedules non-preemptive, equal length jobs using two identical machines. Our goal is to maximize the number of jobs which can be scheduled by their deadlines. Each job has an arbitrary release date and deadline, which is revealed to the scheduler only upon its release time. We analyze this algorithm by comparing its results to an optimal offline schedule. In this way, we show that the algorithm is 3/2 competitive.
Mon Nov 28	Bryan Clair	"The Microsoft security workshop for academia"
Abstract: I'll be talking about things I learned at the Microsoft security workshop for academia.  I'll demonstrate some common security vulnerabilities (including SQL injection and Cross Site Scripting).  I'll also talk about how Microsoft is attempting to deal with these issues.

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Topology- Geometry Seminar
Fridays, 11:00 - 11:50 in Ritter Hall 316

DATE	SPEAKER	TITLE
Thu Sep 15	Bryan Clair	Optimal strategies in sports betting pools. Part I
Special Time: 3:45-4:45 p.m. RH 316 Abstract: Every fall, millions of Americans enter betting pools to pick winners of the weekly NFL football games. In the spring, NCAA tournament basketball pools are even more popular. In both cases, teams which are popularly perceived as “favorites” gain a disproportionate share of entries. In large pools there can be a significant advantage to picking upsets that differentiate your picks from the crowd. In this talk I will present a probability model of betting pools that incorporates pool participant behavior. From the model, one can derive strategies that maximize the expected return on a bet in both football and tournament style pools. This talk will focus on football pools, which involve a collection of independent outcomes.
Thu Sep 22	Bryan Clair	Optimal strategies in sports betting pools. Part II
Special Time: 3:45-4:45 p.m. RH 316 Abstract: A continuation of last week. This talk will focus on basketball pools, which involve a collection of independent outcomes.
Fri Sep 30	David Letscher	Deciding if a manifold is hyperbolic.
Fri Oct 7	David Letscher	Deciding if a manifold is hyperbolic.
Fri Nov 11	Anneke Bart	A note on stamping
Abstract: Joint work with Kevin Scannell: Stamping was introduced as a non-bending deformation. We show that this deformation as given in the example is actually a sum of bends on three totally geodesic surfaces. The first talk will provide an overview of the pertinent definitions and theory.
Tue Nov 15	Adam Coffmann IU - Purdue Fort Wayne	Unfolding CR Singularities
Note: Special time Tuesday 4pm Abstract: A notion of unfolding, or multi-parameter deformation, of CR singularities of real submanifolds in complex manifolds is proposed.
Fri Nov 18	Anneke Bart	A note on stamping, Cont'd
Abstract: Joint work with Kevin Scannell: A continuation of last week's talk.

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