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*'''When:''' Fridays at 2:25pm
__NOTOC__
 
= Applied and Computational Mathematics Seminar =
 
*'''When:''' Fridays at 2:25pm (except as otherwise indicated)
*'''Where:''' 901 Van Vleck Hall
*'''Where:''' 901 Van Vleck Hall
*'''Organizers:''' [https://www.math.wisc.edu/~spagnolie/ Saverio Spagnolie], [https://people.math.wisc.edu/~rycroft/ Chris Rycroft], and [https://sites.google.com/view/laurel-ohm-math Laurel Ohm]
*'''To join the ACMS mailing list:''' Send mail to [mailto:acms+join@g-groups.wisc.edu acms+subscribe@g-groups.wisc.edu].


<br>
<br>  
 
== Spring 2011 Semester ==


{| style="color:white; font-size:100%" border="0" cellpadding="14" cellspacing="5"
== '''Fall 2025''' ==
{| cellpadding="8"
! align="left" |Date
! align="left" |Speaker
! align="left" |Title
! align="left" |Host(s)
|-
|-
| bgcolor="#6699FF" width="250" align="center"|'''Date'''
|Sep 19*
| bgcolor="#6699FF" width="250" align="center"|'''Speaker'''
|[https://www.anl.gov/profile/zichao-di Zichao (Wendy) Di] (Argonne National Laboratory)
| bgcolor="#6699FF" width="250" align="center"|'''Title (click to see abstract)'''
|Multimodal Inverse Problems and Multilevel Optimization for X-ray Imaging Science
| bgcolor="#6699FF" width="250" align="center"|'''Host'''
|Rycroft/Li
<!--
|-
|-
| bgcolor="#5A5A5A"|<font color="red">Special Time</font><br> Jan. 27 (Thursday 4:30pm, 901 Van Vleck)
|Sep 26
| bgcolor="#009966"|[http://math.berkeley.edu/~cvinzant/ <font color="white">Cynthia Vinzant</font>], <br> UC Berkeley
|[https://scholar.google.com/citations?user=Imuw5CMAAAAJ&hl=en&oi=ao Pouria Behnoudfar] (UW)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Cynthia_Vinzant.2C_UC_Berkeley|<font color="white"><em>The central curve in linear programming</em></font>]]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~craciun/ <font color="white">Gheorghe Craciun</font>]
|Spagnolie
|-
|-
| bgcolor="#5A5A5A"|<font color="red">Mathematics Colloqium</font><br> Jan. 28 (Friday at 4pm, B239 Van Vleck)
|Oct 3
| bgcolor="#009966"|[http://math.berkeley.edu/~mroper/www/Home.html <font color="white">Marcus Roper</font>], <br> UC Berkeley
|
| bgcolor="#0066CC"|[http://www.math.wisc.edu/wiki/index.php/Colloquia <font color="white"><em>Modeling microbial cooperation</em></font>]
|
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~milewski/ <font color="white">Paul Milewski</font>]
|
|-
|-
| bgcolor="#5A5A5A"|Feb. 4 (Friday)
|Oct 10*
| bgcolor="#009966"|[http://www.cs.stir.ac.uk/~jzf/ <font color="white">J&oacute;zsef Farkas</font>], <br> University of Stirling, Scotland
|[https://www.alexandriavolkening.com Alexandria Volkening] (Purdue)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#J.C3.B3zsef_Farkas.2C_University_of_Stirling.2C_Scotland|<font color="white"><em>Analysis of a size-structured cannibalism model with infinite dimensional environmental feedback
|TBD
</em></font>]]
|Rycroft
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~rossmani/ <font color="white">James Rossmanith</font>]
|-
|-
| bgcolor="#5A5A5A"|<font color="red">*** Special Room ***</font> <br> Feb. 11 (Friday) <br> B239 Van Vleck
|Oct 17*
| bgcolor="#009966"|[http://www.inf.ethz.ch/personal/mtatiana/index_english.html <font color="white">Tatiana M&aacute;rquez-Lago </font>], <br> ETH-Zurich
|[https://www.nickderr.me/ Nick Derr] (UW)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Tatiana_M.C3.A1rquez-Lago.2C_ETH-Zurich|<font color="white"><em>Stochastic models in systems and synthetic biology</em></font>]]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~milewski/ <font color="white">Paul Milewski</font>]
|Spagnolie
|-
|-
| bgcolor="#5A5A5A"|Feb. 18 (Friday)
|Oct 24
| bgcolor="#009966"|[http://ccom.ucsd.edu/~astern/ <font color="white">Ari Stern </font>], <br> UC San Diego
|[https://cims.nyu.edu/~oneil/ Mike O'Neil] (Courant)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Ari_Stern.2C_UC_San_Diego|<font color="white"><em>Geometric variational crimes: Hilbert complexes, finite element exterior calculus, and problems on hypersurfaces</em></font>]]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~milewski/ <font color="white">Paul Milewski</font>]
|Spagnolie
|-
|-
| bgcolor="#5A5A5A"|Feb. 25 (Friday)
|Oct 31
| bgcolor="#009966"|[http://www.math.duke.edu/~jliu/ <font color="white">Jian-Guo Liu</font>], <br> Duke University
|[https://people.math.wisc.edu/~hhong78/ Hyukpyo Hong] (UW)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Jian-Guo_Liu.2C_Duke_University|<font color="white"><em>Dynamics of orientational alignment and phase transition
|TBD
</em></font>]]
|Spagnolie
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~jin/ <font color="white">Shi Jin</font>]
|-
|-
| bgcolor="#5A5A5A"|<font color="red">Mathematics Colloqium</font><br> March 4 (Friday at 4pm, B239 Van Vleck)
|Nov 7*
| bgcolor="#009966"|[http://atoc.colorado.edu/people/weiss/ <font color="white">Jeff Weiss</font>], <br> University of Colorado, Boulder
|[https://thales.mit.edu/bush/ John Bush] (MIT)
| bgcolor="#0066CC"|[http://www.math.wisc.edu/wiki/index.php/Colloquia <font color="white"><em>Nonequilibrium statistical mechanics and climate variability</em></font>]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~jeanluc/ <font color="white">Jean-Luc Thiffeault</font>]
|Spagnolie
-->
|-
|-
| bgcolor="#5A5A5A"|March 25 (Friday)
|Nov 14
| bgcolor="#009966"|[http://www.reluga.org/tim/ <font color="white">Tim Reluga</font>], <br> Penn State University
|[https://sites.google.com/andrew.cmu.edu/yukunyue/home Yukun Yue] (UW)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Tim_Reluga.2C_Penn_State_University|<font color="white"><em>Accounting for individual and community interests in the public-health management of infectious diseases</em></font>]]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~rossmani/ <font color="white">James Rossmanith</font>]
|Spagnolie
|-
|-
| bgcolor="#5A5A5A"|March 30 (Wednesday)
|Nov 21*
| bgcolor="#009966"|[http://www.rpi.edu/~lvovy/ <font color="white">Yuri Lvov</font>], <br> Rensselaer Polytechnic Institute
|[https://jesnial.github.io/ Jessie Levillain] (CNES/INSA Toulouse)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Yuri_Lvov.2C_Rensselaer_Polytechnic_Institute|<font color="white"><em>TBA</em></font>]]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~lsmith/ <font color="white">Leslie Smith</font>]
|Ohm
|-
|-
| bgcolor="#5A5A5A"|<font color="yellow">UW Faculty Lecture</font> <br> April 1 (Friday)
|Nov 28
| bgcolor="#009966"|[http://www.math.wisc.edu/~kiselev/ <font color="white">Alex Kiselev</font>], <br> UW-Madison (Mathematics)
|Thanksgiving
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Alex_Kiselev.2C_UW-Madison_.28Mathematics.29|<font color="white"><em>Biomixing by chemotaxis and enhancement of biological reactions</em></font>]]
|
| bgcolor="#5A5A5A"|<font color="white">Local</font>
|
|-
|-
| bgcolor="#5A5A5A"|April 6 (Wednesday)
|Dec 5
| bgcolor="#009966"|[http://www-personal.umich.edu/~gerahdez/ <font color="white">Gerardo Hern&aacute;ndez-Due&ntilde;as</font>], <br> University of Michigan
|[https://mesomod.weebly.com/ Jiamian Hu] (UW; Engineering)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Gerardo_Hern.C3.A1ndez-Due.C3.B1as.2C_University_of_Michigan|<font color="white"><em>Shallow water flows in channels</em></font>]]
|TBD
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~rossmani/ <font color="white">James Rossmanith</font>]
|Chen
|-
|-
| bgcolor="#5A5A5A"|April 8 (Friday)
|Dec 12
| bgcolor="#009966"|[http://math.asu.edu/~ag/ <font color="white">Anne Gelb</font>], <br> Arizona State University
|[https://sites.google.com/a/brandeis.edu/tfai/home Thomas Fai] (Brandeis)
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Anne_Gelb.2C_Arizona_State_University|<font color="white"><em>Reconstruction of piecewise smooth functions from non-uniform Fourier data
|TBD
</em></font>]]
|Rycroft
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~jin/ <font color="white">Shi Jin</font>]
|-
| bgcolor="#5A5A5A"|<font color="red">Mathematics Colloqium</font><br> April 15 (Friday at 4pm, B239 Van Vleck)
| bgcolor="#009966"|[http://people.sc.fsu.edu/~mgunzburger/ <font color="white">Max Gunzburger</font>], <br> Florida State University
| bgcolor="#0066CC"|[http://www.math.wisc.edu/wiki/index.php/Colloquia <font color="white"><em>TBA</em></font>]
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~rossmani/ <font color="white">James Rossmanith</font>]
|-
| bgcolor="#5A5A5A"|April 22 (Friday)
| bgcolor="#009966"|[http://www.math.unm.edu/~vageli/ <font color="white">Vageli Coutsias</font>], <br> University of New Mexico
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Vageli_Coutsias.2C_University_of_New_Mexico|<font color="white"><em>TBA</em></font>]]
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~mitchell/ <font color="white">Julie Mitchell</font>]
|-
| bgcolor="#5A5A5A"|April 27 (Wednesday)
| bgcolor="#009966"|[http://ccom.ucsd.edu/~mholst/ <font color="white">Michael Holst</font>], <br> UC San Diego
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Michael_Holst.2C_UC_San_Diego|<font color="white"><em>TBA</em></font>]]
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~jin/ <font color="white">Shi Jin</font>]
|-
| bgcolor="#5A5A5A"|April 29 (Friday)
| bgcolor="#009966"|[http://www.math.lsa.umich.edu/~karni/ <font color="white">Smadar Karni</font>], <br> University of Michigan
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Smadar_Karni.2C_University_of_Michigan|<font color="white"><em>TBA</em></font>]]
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~rossmani/ <font color="white">James Rossmanith</font>]
|-
| bgcolor="#5A5A5A"|May 4 (Wednesday)
| bgcolor="#009966"|<font color="white">Tim Barth</font>, <br> NASA Ames
| bgcolor="#0066CC"|[[Applied/ACMS/absS11#Tim_Barth.2C_NASA_Ames|<font color="white"><em>TBA</em></font>]]
| bgcolor="#5A5A5A"|[http://www.math.wisc.edu/~rossmani/ <font color="white">James Rossmanith</font>]
|}
|}
''[Dates marked with an asterisk are close to weekends with a home game for the [https://uwbadgers.com/sports/football/schedule UW Badgers football team]. Hotel availability around these dates is often limited if booked on short notice.]''


<br>
==Abstract==


== Organizer contact information ==
<div id="Chandler">
[[Image:sign.jpg|250px|link="http://www.math.wisc.edu/~rossmani"]]
'''Zichao (Wendy) Di (Argonne National Laboratory)'''


<br>
Title: Multimodal Inverse Problems and Multilevel Optimization for X-ray Imaging Science


== How to join the ACMS mailing list ==
X-ray imaging experiments generate vast datasets that are often incomplete or ill-posed when considered in isolation. One way forward is multimodal data analysis, where complementary measurement modalities are fused to reduce ambiguity and improve reconstructions. A key question, both mathematically and practically, is how to identify which modalities to combine and how best to integrate them within an inverse problem framework.
See [https://mailhost.math.wisc.edu/mailman/listinfo/acms mailing list] website


<br>
A second line of work focuses on the computational challenge: even for single-modality inverse problems, the resulting optimization problems are large-scale, nonlinear, and nonconvex. Here, I will discuss multilevel optimization and stochastic sampling strategies that accelerate convergence by exploiting hierarchical structure in both parameter and data spaces.


Although developed separately, these two directions point toward a common goal: building scalable, optimization-based frameworks that make the best use of diverse data to enable new discoveries in X-ray imaging science.<div id="Fraser"><div id="Luedtke"><div id="Zhdankin"><div id="Boffi"><div id="Shankar"><div id="Loevbak">
<div id="Lu"><div id="Vogman"><div id="Cockburn">
== Archived semesters ==
== Archived semesters ==
*[[Applied/ACMS/Spring2025|Spring 2025]]
*[[Applied/ACMS/Fall2024|Fall 2024]]
*[[Applied/ACMS/Spring2024|Spring 2024]]
*[[Applied/ACMS/Fall2023|Fall 2023]]
*[[Applied/ACMS/Spring2023|Spring 2023]]
*[[Applied/ACMS/Fall2022|Fall 2022]]
*[[Applied/ACMS/Spring2022|Spring 2022]]
*[[Applied/ACMS/Fall2021|Fall 2021]]
*[[Applied/ACMS/Spring2021|Spring 2021]]
*[[Applied/ACMS/Fall2020|Fall 2020]]
*[[Applied/ACMS/Spring2020|Spring 2020]]
*[[Applied/ACMS/Fall2019|Fall 2019]]
*[[Applied/ACMS/Spring2019|Spring 2019]]
*[[Applied/ACMS/Fall2018|Fall 2018]]
*[[Applied/ACMS/Spring2018|Spring 2018]]
*[[Applied/ACMS/Fall2017|Fall 2017]]
*[[Applied/ACMS/Spring2017|Spring 2017]]
*[[Applied/ACMS/Fall2016|Fall 2016]]
*[[Applied/ACMS/Spring2016|Spring 2016]]
*[[Applied/ACMS/Fall2015|Fall 2015]]
*[[Applied/ACMS/Spring2015|Spring 2015]]
*[[Applied/ACMS/Fall2014|Fall 2014]]
*[[Applied/ACMS/Spring2014|Spring 2014]]
*[[Applied/ACMS/Fall2013|Fall 2013]]
*[[Applied/ACMS/Spring2013|Spring 2013]]
*[[Applied/ACMS/Fall2012|Fall 2012]]
*[[Applied/ACMS/Spring2012|Spring 2012]]
*[[Applied/ACMS/Fall2011|Fall 2011]]
*[[Applied/ACMS/Spring2011|Spring 2011]]
*[[Applied/ACMS/Fall2010|Fall 2010]]
*[[Applied/ACMS/Fall2010|Fall 2010]]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Spring10.html Spring 2010]
<!--
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Fall09.html Fall 2009]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring10.html Spring 2010]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Spring09.html Spring 2009]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall09.html Fall 2009]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Fall08.html Fall 2008]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring09.html Spring 2009]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Spring08.html Spring 2008]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall08.html Fall 2008]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Fall07.html Fall 2007]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring08.html Spring 2008]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Spring07.html Spring 2007]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall07.html Fall 2007]
*[http://www.math.wisc.edu/~rossmani/ACMS/archive/Fall06.html Fall 2006]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring07.html Spring 2007]
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall06.html Fall 2006]
-->


<br>
<br>

Latest revision as of 02:58, 5 September 2025


Applied and Computational Mathematics Seminar


Fall 2025

Date Speaker Title Host(s)
Sep 19* Zichao (Wendy) Di (Argonne National Laboratory) Multimodal Inverse Problems and Multilevel Optimization for X-ray Imaging Science Rycroft/Li
Sep 26 Pouria Behnoudfar (UW) TBD Spagnolie
Oct 3
Oct 10* Alexandria Volkening (Purdue) TBD Rycroft
Oct 17* Nick Derr (UW) TBD Spagnolie
Oct 24 Mike O'Neil (Courant) TBD Spagnolie
Oct 31 Hyukpyo Hong (UW) TBD Spagnolie
Nov 7* John Bush (MIT) TBD Spagnolie
Nov 14 Yukun Yue (UW) TBD Spagnolie
Nov 21* Jessie Levillain (CNES/INSA Toulouse) TBD Ohm
Nov 28 Thanksgiving
Dec 5 Jiamian Hu (UW; Engineering) TBD Chen
Dec 12 Thomas Fai (Brandeis) TBD Rycroft

[Dates marked with an asterisk are close to weekends with a home game for the UW Badgers football team. Hotel availability around these dates is often limited if booked on short notice.]

Abstract

Zichao (Wendy) Di (Argonne National Laboratory)

Title: Multimodal Inverse Problems and Multilevel Optimization for X-ray Imaging Science

X-ray imaging experiments generate vast datasets that are often incomplete or ill-posed when considered in isolation. One way forward is multimodal data analysis, where complementary measurement modalities are fused to reduce ambiguity and improve reconstructions. A key question, both mathematically and practically, is how to identify which modalities to combine and how best to integrate them within an inverse problem framework.

A second line of work focuses on the computational challenge: even for single-modality inverse problems, the resulting optimization problems are large-scale, nonlinear, and nonconvex. Here, I will discuss multilevel optimization and stochastic sampling strategies that accelerate convergence by exploiting hierarchical structure in both parameter and data spaces.

Although developed separately, these two directions point toward a common goal: building scalable, optimization-based frameworks that make the best use of diverse data to enable new discoveries in X-ray imaging science.
Retrieved from "https://wiki-dev.math.wisc.edu/index.php?title=Applied/ACMS&oldid=28964"