Seminars and Colloquiums
for the week of October 1, 2007
Speakers:
Ms. Rachel Miller & Mr. Michael Neilan , Monday
Dr. David Anderson, Tuesday
Professor Elias Wegert, Technical University Freiberg, Tuesday
Dr. Carl Sundberg, Wednesday
Dr. Shaun Hendy, Victoria University and Industrial Research Ltd., Wellington, Thursday
Dr. Michael W. Berry,
Department of Electrical Engineering and Computer Science, Thursday
Monday, October 1
DE/APPLIED AND COMPUTATIONAL MATH SEMINAR
TIME: 3:35-4:30 p.m.
ROOM: Ayres 309A
SPEAKER: Rachel Miller and Michael Neilan
TITLE: (1) Optimal control applied to native-invasive population dynamics (Miller)
(2)Finite element approximations of the fully nonlinear Monge-Ampere equation (Neilan)
Tuesday, October 2
ALGEBRA SEMINAR
TIME: 2:10 p.m. - 3:00 p.m.
ROOM: Ayres Hall 309B
SPEAKER: Dr. David Anderson
TITLE: D+M Construction
JUNIOR COLLOQUIUM
TIME: 3:40 p.m.
ROOM: Ayres Hall 214
SPEAKER: Dr. Elias Wegert, Technical University, Freiberg Germany
TITLE: “Relaxation Procedures on Graphs”
ABSTRACT: Our starting point will be Problem 3 of the International Mathematical Olympiad (IMO) in 1986 which belongs to the hardest challenges this contest has ever seen: The Pentagon Game 1. Five integers with positive sum are assigned to the vertices of a pentagon. If there is at least one negative number, the player may pick one of them, say y, add it to its two neighbors x and z, and then reverse the sign of y. The game terminates when all the numbers are nonnegative. Prove that this must always happen. We present several approaches to the IMO problem and its generalizations. In particular we introduce and investigate the “Threshold Averaging Procedure”, the “Decreasing Mean Values Procedure”, and a “Relaxation Procedure” on graphs.
Wednesday, October 3
ANALYSIS SEMINAR
TIME: 3:40 p.m. - 4:25 p.m.
ROOM: Ayres Hall 209A
SPEAKER: Dr. Carl Sundberg (joint work with Dr. Stefan Richter)
TITLE: Model Theory for Commuting Tuples of Operators, III
Thursday, October 4
COMPUTATIONAL/APPLIED MATH SEMINAR
TIME: 12:40 p.m. - 1:55 p.m.
ROOM: Ayres Hall 218
SPEAKER: Dr. Shaun Hendy, Victoria University and Industrial Research Ltd., Wellington
TITLE: “A Hybrid Kinetic Monte Carlo-Molecular Dynamics Method”
MATH COLLOQUIUM
TIME: 3:40 – 4:25
ROOM: Ayres Hall 214
SPEAKER: Dr. Michael W. Berry,
Department of Electrical Engineering and Computer Science
TITLE: “Topic Detection and Tracking Using Nonnegative Matrix and Tensor Factorizations”
ABSTRACT: Automated approaches for the identification and clustering of
semantic features or topics are highly desired for text mining applications. Using a low rank non-negative matrix factorization (NNMF)algorithm to retain natural data non-negativity, we eliminate the need to use subtractive basis vector and encoding calculations present in techniques such as principal component analysis for semantic feature abstraction. Using non-negative tensor factorization (NNTF), temporal and semantic proximity can be exploited to enable tracking of focused discussions as well as latent (unknown) communication patterns. Demonstrations of NNMF and NNTF algorithms for topic (or discussion)
detection and tracking using the Enron Email Collection and documents from the Airline Safety Reporting System (ASRS) are provided.
Previous Announcements:
Week of:
Seminars from 2006-2007 academic year