Event Categories

Apr 11 12:30 pm ESB 4133
FractionalStep RungeKutta Methods: Representation and Linear Stability Analysis
Raymond Spiteri, University of Saskatchewan Computer Science SCAIM SeminarFractionalstep methods are a popular and powerful divideandconquer approach for the numerical solution of differential equations. When the integrators of the fractional steps...
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Apr 4 12:30 pm ESB 4133
Secant penalized BFGS (SPBFGS): A Noise Robust QuasiNewton Method via Penalizing the Secant Condition
Brian Irwin, UBC Department of Earth, Ocean, and Atmospheric Sciences SCAIM SeminarI will present secant penalized BFGS (SPBFGS), a noise robust variant of the wellknown BFGS optimization technique (see https://doi.org/10.1007/s1058902200448x). SPBFGS is designed...
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Mar 28 12:30 pm ESB 4133
HighPerformance Adaptive Simulations of Immersed Deformable Membranes
Damien Huet, UBC Mathematics SCAIM SeminarMembraneenclosed fluid objects, or capsules, are everywhere in natural and industrial processes, from red blood cells and circulating tumor cells in the life...
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Mar 21 12:30 pm ESB 4133
Act Normal That’s Crazy Enough — An Overview of Seismic Inversion with Normalizing Flows and Surrogate Modeling
Felix J. Herrmann, Georgia Institute of Technology SCAIM SeminarI will give an overview on how techniques from neural (conditional) density estimation and surrogate modeling can be used to solve challenging problems...
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Mar 14 12:30 pm ESB 4133
LowRank Tensor Train Methods for Isogeometric Analysis
Alexandra Bünger, UBC Computer Science SCAIM SeminarIsogeometric analysis (IGA) has been recently developed to build a bridge between geometric computeraided design and PDE analysis. In IGA, spline functions used...
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Feb 14 12:30 pm ESB 4133
MicrostructureInformed Models of Hydrodynamic Force and Torque in a Static Random Array of Spheres
Anthony Wachs, UBC Mathematics and Chemical and Biological Engineering SCAIM SeminarI present recent advances in the design of models of hydrodynamic force and torque exerted on monodisperse spheres in a statistically homogeneous random...
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Feb 7 12:00 pm ESB 4133
Concerning the Spatial Localization of Eigenvectors (and Waves) in Complex Media
Jeffrey Ovall, Portland State University, Mathematics and Statistics SCAIM SeminarIt is wellknown that a function u=u(t,x) describing the behavior of acoustic or electromagnetic waves in time and space can often be decomposed...
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Jan 31 12:00 pm ESB 4133
What Does Mathematics Know about Thawing Permafrost?
Malgorzata Peszynska, Oregon State University, Mathematics SCAIM SeminarPermafrost is the ground that remains frozen for two or more years, and is a complex environment with great importance to climate...
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Jan 24 12:00 pm ESB 4133
On Optimization Formulations and Algorithms of Markov Decision Problems
Lexing Ying, Stanford University Mathematics and ICME SCAIM SeminarMarkov decision problems and reinforcement learning have been active research areas in the past decade. Compared with the rapid algorithmic developments, the linear/convex...
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Jan 17 12:30 pm ESB 4133
Geometric Shallow Learning with the Atomic Cluster Expansion
Christoph Ortner, UBC Mathematics SCAIM SeminarI will introduce a natural geometric learning framework, the atomic cluster expansion (ACE), which focuses on linear and shallow models, and adds a...
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Mar 10 12:30 pm MATH 126
Talk 1: Nilima Nigam
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Title: An overview of finite element methods à la Dominik Schoetzau
Abstract:
Finite element methods occupy a central and ubiquitous place in... 
Mar 3 12:30 pm ESB 4133
We discuss some recent advances in developing meshfree methods based on radial basis function generated finite differences (RBFFD) for numerically solving partial differential...
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Feb 11 12:30 pm ESB 4133
Over the past few decades, a lot of attention has been drawn to largescale streaming data analysis, where researchers are faced with huge...
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Jan 28 12:30 pm ESB 4133
Error bounds for the conjugate gradient method using minimal polynomials are well known. What are less well known are comparable bounds for indefinite...
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Jan 14 12:30 pm ESB 4133
Results on a two way convectiondiffusion problem; an asymptotic error analysis on a piecewise uniform grid; and a framework for understanding quadrature errors...
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Nov 26 12:30 pm ESB 4133
In this talk I will introduce the quantum phaseestimation problem as well as the iterative algorithm by Kitaev that is commonly used to solve it....
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Nov 19 12:30 pm ESB 4133
Deep learning (DL) is transforming whole industries as complicated decisionmaking processes are being automated by neural networks trained on realworld data. Yet as...
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Oct 29 12:30 pm ESB 4133
Different from most deep learning settings, we focus on the situation where we have only one or a few largescale...
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Oct 8 12:30 pm ESB 4133
Generative Adversarial Networks have been shown to be powerful in generating content. To this end, they have been studied intensively in the last...
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May 7 12:30 pm ESB 4133
Hybrid Data+PhysicsDriven Modelling of Interatomic Forces
Christoph Ortner, Mathematics Institute, University of Warwick SCAIM SeminarAccurate molecular simulation requires computationally expensive quantum chemistry models that makes simulating complex material phenomena or large molecules intractable. The past decade has... Read More 
Apr 9 12:30 pm ESB 4133
Reduced Order Models and Randomization for Fast Nonlinear Inversion and Optimization
Eric de Sturler, Department of Mathematics, Virginia Tech SCAIM SeminarIn many largescale inverse problems and optimization problems, the objective function (to be minimized) is composed of many... Read More 
Mar 26 12:30 pm ESB 4133
Do We Really Understand the Conjugate Gradient Algorithm?
Anne Greenbaum, Department of Mathematics, University of Washington SCAIM SeminarThe conjugate gradient algorithm (CG) is a widely used iterative method for solving large symmetric positive definite linear systems Ax=b. Beginning in the 1980's (and,... Read More 
Mar 19 12:30 pm ESB 4133
Asynchronous Iterative Methods
Edmond Chow, School of Computational Science and Engineering, Georgia Institute of Technology SCAIM SeminarThe standard iterative methods for solving linear and nonlinear systems of equations are all synchronous, meaning that in the parallel execution... Read More 
Feb 26 12:30 pm ESB 4133
Probing Fundamental Bounds in Hydrodynamics Using Variational Optimization Methods
Bartosz Protas, McMaster University SCAIM SeminarIn the presentation we will discuss our research program concerning the study of extreme vortex events in viscous incompressible flows. These vortex states...
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Feb 25 12:30 pm ESB 4133
The singular value decomposition (SVD) is one of the core computations of today's scientific applications and data analysis tools. The main goal is...
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Jan 29 12:30 am ESB 4133
Parameter Instability Regimes in Sparse Proximal Denoising Programs
Aaron Berk, University of British Columbia SCAIM SeminarCompressed sensing theory explains why Lasso programs recover structured highdimensional signals with minimax orderoptimal error. Yet, the optimal choice of the program’s governing...
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Jan 22 12:30 pm ESB 4133
The Generalized Null Space Decomposition and its Relevance to the Computation of the Jordan Canonical Form
Michael Overton, New York University SCAIM SeminarThe generalized null space decomposition (GNSD), better known as the staircase decomposition, is a unitary reduction of a general matrix A of order...
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Jan 15 12:30 pm ESB 4133
In this talk, we introduce an unusual eigenvalue problem that arises in fluidstructure interaction problems: the Jones eigenmode problem, described first by D.S....
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Nov 20 12:30 pm
For my work supporting Bifrost, a programming environment built for visual effects artists, I am seeking a good “default” preconditioner for solving linear...
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Nov 13 12:30 pm ESB 4133
URL for Speaker: https://sites.google.com/site/yifansunwebsite/
In this work, we examine notions of alignment with respect to a generalized form of Holder's inequality. We show...
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Oct 30 12:30 pm ESB 4133
Low Synchronization GramSchmidt and GMRES Algorithms
Stephen Thomas, National Renewable Energy Laboratory SCAIM SeminarCommunicationavoiding and pipelined variants of Krylov solvers are critical for the scalability of linear system solvers on future exascale architectures. We present low... Read More 
Oct 23 7:00 pm
Speaker: Henry Wolkowicz, University of Waterloo
URL for Speaker: http://www.math.uwaterloo.ca/~hwolkowi/
Location: ESB 4133
Intended Audience: Public
Abstract:The quadratic assignment problem, QAP, has... Read More 
Oct 2 7:30 pm
Speaker: Lawrence Ward, Department of Psychology and Brain Research Centre, University of British Columbia
URL for Speaker: http://www2.psych.ubc.ca/~lward/ward.htm
Location: ESB 4133
...
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Sep 25 7:30 pm
Speaker: James Hewett, University of Canterbury
Location: ESB 4133
Intended Audience: Public
Moving boundary problems are found in many contexts including coastlines and... Read More 
Jan 25 7:00 pm
Speaker: Alexander Bihlo, Department of Mathematics and Statistics, Memorial University of Newfoundland
URL for Speaker: http://www.mun.ca/math/people/pplfaculty/bihlo.php
Location: ESB 4133
Intended Audience: ...
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Jan 16 8:30 pm
Speaker: Timm Treskatis, Mathematics UBC
URL for Speaker: https://blogs.ubc.ca/timm/
Location: ESB 4133
Intended Audience: Public
What if we could imitate spider silk...
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Nov 14 8:30 pm
Speaker: Tony Wong, Mathematics UBC
Location: ESB 4133 (the PIMS Lounge)
Intended Audience: Public
The eikonal equation is a fundamental nonlinear PDE that...
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Jun 13 7:30 pm
Speaker: Joshua Scurll, Department of Mathematics, The University of British Columbia
URL for Speaker: https://ca.linkedin.com/in/joshscurll57427595
Location: ESB 2012
Intended Audience: Public
With...
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Mar 14 7:30 pm
The formation of Liesegang Rings
SCAIM SeminarSpeaker: Iain Moyles, MACSI Limerick
URL for Speaker: http://ulsites.ul.ie/macsi/iainmoylesprofile
Location: ESB 4133
Intended Audience: Public
Many chemical systems exhibit a regular pattern...
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Nov 24 8:30 pm
Speaker: Jonathan Bardsley, Math Department, University of Montana
URL for Speaker: http://www.math.umt.edu/bardsley/
Location: ESB 4133
Intended Audience: Public
Many solution techniques for...
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Feb 3 8:30 pm
Speaker: David Moulton
URL for Speaker: http://math.lanl.gov/~moulton/
Location: ESB 4133
Intended Audience: Public
Modeling and simulation are playing an increasingly critical role...
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Nov 4 8:30 pm ESB 4133
Interventional Ultrasound for Spine Injections
SCAIM SeminarSpeaker: Purang Abolmaesumi, Department of Electrical and Computer Engineering, UBC
URL for Speaker: http://www.ece.ubc.ca/faculty/purangabolmaesumi
Location: ESB 4133
Our goal is to develop...
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Oct 24 7:30 pm
Speaker: Randy LeVeque, Applied Mathematics, University of Washington
Location: ESB 4133
Intended Audience: Public
I will give a brief introduction to highresolution (shockcapturing)...
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Oct 16 11:00 pm
Speaker: Doug Nychka, Director of the Institute for Mathematics Applied to Geosciences of the US National Center for Atmospheric Research
Location: Michael...
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Mar 25 7:30 pm
Speaker: Christoph Ortner, University of Warwick
URL for Speaker: http://homepages.warwick.ac.uk/staff/C.Ortner/
Location: ESB 4133
Intended Audience: Public
The dimer method is a simple...
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Jan 28 8:30 pm
Speaker: Sherry Li, Lawrence Berkeley National Lab
URL for Speaker: http://crdlegacy.lbl.gov/~xiaoye/
Location: ESB 4133
Intended Audience: Public
Nested dissection ordering and its...
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Nov 19 8:30 pm
Speaker: Fred Roosta, Department of Computer Science, University of British Columbia
Location: ESB 4133
Intended Audience: Public
This talk is concerned with MonteCarlo...
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Nov 5 8:30 pm
Alignment of optimally transported meshes
SCAIM SeminarSpeaker: Emily Walsh, Department of Mathematics, Simon Fraser University
Location: ESB 4133
Intended Audience: Public
Solutions of partial differential equations are often highly...
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Oct 8 7:30 pm
Scientific computing and mathematical proofs
SCAIM SeminarSpeaker: Uri Ascher, Department of Computer Science, UBC
Location: ESB 4133
Intended Audience: Public
Computer simulation is widely recognized nowadays as a major...
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Sep 12 7:30 pm
Speaker: Tim Warburton, Department of Computational and Applied Mathematics, Rice University
Location: ESB 4133
Intended Audience: Public
The ultimate success of many modeling...
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Sep 10 7:30 pm
Speaker: Irad Yavneh, Technion
Location: ESB 4133
Intended Audience: Public
The area of sparse representation of signals is drawing tremendous attention in recent...
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Apr 16 7:30 pm
Speaker: Sofia Zaourar, INRIA Grenoble, France
Location: ESB 4133
Intended Audience: Public
We consider convex nonsmooth optimization problems whose objectivefunction is known through... Read More 
Mar 26 7:30 pm
Speaker: Maryam Fazel, Electrical Engineering Department, University of Washington
URL for Speaker: http://faculty.washington.edu/mfazel/
Location: ESB 4133
Intended Audience: Public
We consider models...
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Mar 12 7:30 pm
Speaker: Daniel Y. Ding, Sauder School of Business, UBC
URL for Speaker: http://www.sauder.ubc.ca/Faculty/People/Faculty_Members/Ding_Yichuan
Location: ESB 4133
Intended Audience: Public
We consider a...
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Mar 5 8:30 pm
Speaker: Eldad Haber, Department of Mathematics/Earth, Ocean and Atmospheric Sciences, UBC
URL for Speaker: http://www.math.ubc.ca/~haber/Eldad_Haber_Web_Page/Welcome.html
Location: ESB 4133
Intended Audience: Public
Flow...
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Feb 5 8:30 pm
Speaker: Lars Ruthotto, Department of Earth and Ocean Sciences, UBC
Location: ESB 4133
Intended Audience: Public
Finding geometrical correspondences between two images, called...
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Jan 29 8:30 pm
Speaker: Brian Wetton, Department of Mathematics, University of British Columbia
URL for Speaker: http://www.math.ubc.ca/~wetton/
Location: ESB 4133
Intended Audience: Public
A computational...
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Dec 4 8:30 pm
Numerical Solution of PDEs Involving Interfaces
SCAIM SeminarSpeaker: JeanChristophe Nave, Department of Mathematics and Statistics, McGill University
URL for Speaker: http://www.math.mcgill.ca/jcnave/
Location: ESB 4133
Intended Audience: Public
The numerical...
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Nov 27 8:30 pm
Speaker: Cenk Sahinalp, Department of Computer Science, Simon Fraser University
URL for Speaker: http://www.cs.sfu.ca/~cenk/
Location: ESB 4133
Intended Audience: Public
In this...
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Nov 13 8:30 pm
The numerical solution of the TaylorGoldstein equation
SCAIM SeminarSpeaker: Tim Rees, School of Earth and Ocean Sciences, University of Victoria
Location: ESB 4133
Intended Audience: Public
The TaylorGoldstein (TG) equation governs...
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Oct 30 7:30 pm
Reweighted algorithms for sparse signal recovery
SCAIM SeminarSpeaker: Hassan Mansour, Department of Mathematics / Department of Earth and Ocean Sciences, UBC
URL for Speaker: http://www.cs.ubc.ca/~hassanm/
Location: ESB 4133
...
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Oct 16 7:30 pm
Speaker: Daniel W. Zaide, Department of Mechanical Engineering, UBC
URL for Speaker: http://danielzaide.com/
Location: ESB 4133
Intended Audience: Public
Shock capturing schemes...
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Oct 2 7:30 pm
Speaker: David Sidilkover, Soreq NRC, Israel
Location: ESB 4133
Intended Audience: Public
The term "factorizable methods" in the context of fluid flow was...
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Sep 18 7:30 pm
Speaker: Nathan Krislock, Department of Computer Science, UBC
URL for Speaker: https://sites.google.com/site/nathankrislock/
Location: ESB 4133
Intended Audience: Public
During the last two...
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