SIAM Student Chapter Seminar: Difference between revisions

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*'''When:''' Every other Friday at 1:30 pm
 
*'''Where:''' B333 Van Vleck Hall
*'''When:''' Every Other Wednesday at 2:00 pm (except as otherwise indicated)
*'''Organizers:''' [http://www.math.wisc.edu/~xshen/ Xiao Shen]
*'''Where:''' 901 Van Vleck Hall
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright]  
*'''Organizers:''' [http://www.math.wisc.edu/~ke/ Ke Chen]  
*'''To join the SIAM Chapter mailing list:''' email [join-siam-chapter@lists.wisc.edu].
*'''To join the SIAM Chapter mailing list:''' email [join-siam-chapter@lists.wisc.edu] website.


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== Spring 2020 ==
== Fall 2018 ==


{| cellpadding="8"
{| cellpadding="8"
Line 18: Line 16:
!align="left" | title
!align="left" | title
|-
|-
| Sept. 12
|Jan 31
|[http://www.math.wisc.edu/~ke/ Ke Chen] (Math)
|[https://lorenzonajt.github.io/ Lorenzo Najt] (Math)
|''[[#Sep 12: Ke Chen (Math)|Inverse Problem in Optical Tomography]]''
|''[[#Jan 31, Lorenzo Najt (Math)|Ensemble methods for measuring gerrymandering: Algorithmic problems and inferential challenges]]''
|-
|-
|Feb 14
|[https://www.math.wisc.edu/~pollyyu/ Polly Yu] (Math)
|''[[#Feb 14, Polly Yu (Math)|Algebra, Dynamics, and Chemistry with Delay Differential Equations]]''
|-
|-
|-
| Spet. 26 2:15PM
|
|[http://www.math.wisc.edu/~kehlert/ Kurt Ehlert] (Math)
|"[[#Sept 26: Kurt Ehlert (Math)|  TBA  ]]"
|  
|}
|}


== Abstracts ==


== Abstract ==
=== Jan 31, Lorenzo Najt (Math) ===
'''Ensemble methods for measuring gerrymandering: Algorithmic problems and inferential challenges'''


=== Sep 12: Ke Chen (Math) ===
We will review some recent work regarding measuring gerrymandering by sampling from the space of maps, including two methods used in a recent amicus brief to the supreme court. This discussion will highlight some of the computational challenges of this approach, including some complexity-theory lower bounds and bottlenecks in Markov chains. We will examine the robustness of these statistical methods through their connection to phase transitions in the self-avoiding walk model, as well as their dependence on artifacts of discretization. This talk is largely based on https://arxiv.org/abs/1908.08881
Inverse Problem in Optical Tomography


I will briefly talk about my researches on the inverse problems of radiative transfer equations, which is usually used as a model to describe the transport of neutrons or other particles in a certain media. Such inverse problems considers the following question: given the knowledge of multiple data collected at the boundary of the domain of interest, is it possible to reconstruct the optical property of the interior of media? In this talk, I will show you that stability of this problem is deteriorating as the Knudsen number is getter smaller. The talk will be introductory and anyone graduate is welcome to join us.
=== Feb 14, Polly Yu (Math) ===
'''Algebra, Dynamics, and Chemistry with Delay Differential Equations'''


=== Sept 26: Kurt Ehlert (Math) ===
Delay differential equations (DDEs) can exhibit more complicated behavior than their ODE counterparts. What is stable in the ODE setting could exhibit oscillation in DDE. Where do delay equations show up anyway? In this talk, we’ll introduce DDEs, and how (sort-of-)linear algebra gives information about the stability of DDEs.
TBD


TBD
<br>


<br>
== Past Semesters ==
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]

Revision as of 17:11, 13 February 2020


  • When: Every other Friday at 1:30 pm
  • Where: B333 Van Vleck Hall
  • Organizers: Xiao Shen
  • Faculty advisers: Jean-Luc Thiffeault, Steve Wright
  • To join the SIAM Chapter mailing list: email [join-siam-chapter@lists.wisc.edu].


Spring 2020

date speaker title
Jan 31 Lorenzo Najt (Math) Ensemble methods for measuring gerrymandering: Algorithmic problems and inferential challenges
Feb 14 Polly Yu (Math) Algebra, Dynamics, and Chemistry with Delay Differential Equations

Abstracts

Jan 31, Lorenzo Najt (Math)

Ensemble methods for measuring gerrymandering: Algorithmic problems and inferential challenges

We will review some recent work regarding measuring gerrymandering by sampling from the space of maps, including two methods used in a recent amicus brief to the supreme court. This discussion will highlight some of the computational challenges of this approach, including some complexity-theory lower bounds and bottlenecks in Markov chains. We will examine the robustness of these statistical methods through their connection to phase transitions in the self-avoiding walk model, as well as their dependence on artifacts of discretization. This talk is largely based on https://arxiv.org/abs/1908.08881

Feb 14, Polly Yu (Math)

Algebra, Dynamics, and Chemistry with Delay Differential Equations

Delay differential equations (DDEs) can exhibit more complicated behavior than their ODE counterparts. What is stable in the ODE setting could exhibit oscillation in DDE. Where do delay equations show up anyway? In this talk, we’ll introduce DDEs, and how (sort-of-)linear algebra gives information about the stability of DDEs.


Past Semesters