SIAM Student Chapter Seminar: Difference between revisions

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*'''When:''' Fridays at 1:30 PM unless noted otherwise
*'''Where:''' 9th floor lounge (we will also broadcast the virtual talks on the 9th floor lounge with refreshments)
*'''Organizers:''' Yahui Qu, Peiyi Chen and Zaidan Wu
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright]
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].
*'''Zoom link:''' https://uwmadison.zoom.us/j/97976615799?pwd=U2xFSERIcnR6M1Y1czRmTjQ1bTFJQT09
*'''Passcode:  281031'''


== Spring 2025 ==


*'''When:''' Every Other Wednesday at 2:15 pm (except as otherwise indicated)
{| class="wikitable"
*'''Where:''' 901 Van Vleck Hall
|+
*'''Organizers:''' [http://www.math.wisc.edu/~ke/ Ke Chen]
|Date
*'''To join the SIAM Chapter mailing list:''' email [join-siam-chapter@lists.wisc.edu] website.
|Location
 
|Speaker
<br>
|Title
 
 
== Fall 2018  ==
 
{| cellpadding="8"
!align="left" | date
!align="left" | speaker
!align="left" | title
|-
|-
| Sept. 12
|
|[http://www.math.wisc.edu/~ke/ Ke Chen] (Math)
|
|''[[#Sep 12: Ke Chen (Math)|Inverse Problem in Optical Tomography]]''
|
|
|-
|-
| Spet. 26 
|
|[http://www.math.wisc.edu/~kehlert/ Kurt Ehlert] (Math)
|
|''[[#Sept 26: Kurt Ehlert (Math)|  How to bet when gambling]]''
|
|-
|
| Oct. 10 
|[http://TBD Zachary Hansen] (Atmospheric and Oceanic Sciences)
|''[[#Oct 10: Zachary Hansen (Atmospheric and Oceanic Sciences)|  Land-Ocean contrast in lightning  ]]''
|-
| Oct. 24 
|[http://TBD Xuezhou Zhang] (Computer Science)
|''[[#Oct 24: Xuezhou Zhang (Computer Science)|  An Optimal Control Approach to Sequential Machine Teaching  ]]''
|-
| Nov. 7
|[http://TBD Cancelled]
|''[[#Nov 7: Cancelled|  ]]''
|-
| Nov. 21
|[http://TBD Xiaowu Dai] (Statistics)
|''[[#Nov 21: Xiaowu Dai (Statistics)| TBD  ]]''
|-
|-
|
|
|
|
|
|}
|}




== Abstract ==
==Abstracts==
 
=== Sep 12: Ke Chen (Math) ===
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.
 
=== Sept 26: Kurt Ehlert (Math) ===
How to bet when gambling
 
When gambling, typically casinos have an edge. But sometimes we can gain an edge by counting cards or other means. And sometimes we have an edge in the biggest casino of all: the financial markets. When we do have an advantage, then we still need to decide how much to bet. Bet too little, and we leave money on the table. Bet too much, and we risk financial ruin. We will discuss the "Kelly criterion", which is a betting strategy that is optimal in many senses.
 
=== Oct 10: Zachary Hansen (Atmospheric and Oceanic Sciences) ===
Land-Ocean contrast in lightning
 
Land surfaces have orders of magnitude more lightning flashes than ocean surfaces. One explanation for this difference is that land surfaces may generate greater convective available potential energy (CAPE), which fuels stronger thunderstorms. Using a high resolution cloud-resolving atmospheric model, we test whether an island can produce stronger thunderstorms just by having a land-like surface. We find that the island alters the distribution of rainfall but does not produce stronger storms. An equilibrium state known as boundary layer quasi-equilibrium follows, and is explored in more detail.
 
=== Oct 24: Xuezhou Zhang (Computer Science) ===
An Optimal Control Approach to Sequential Machine Teaching
 
Given a sequential learning algorithm and a target model, sequential machine teaching aims to find the shortest training sequence to drive the learning algorithm to the target model. We present the first principled way to find such shortest training sequences. Our key insight is to formulate sequential machine teaching as a time-optimal control problem. This allows us to solve sequential teaching by leveraging key theoretical and computational tools developed over the past 60 years in the optimal control community. Specifically, we study the Pontryagin Maximum Principle, which yields a necessary condition for opti- mality of a training sequence. We present analytic, structural, and numerical implica- tions of this approach on a case study with a least-squares loss function and gradient de- scent learner. We compute optimal train- ing sequences for this problem, and although the sequences seem circuitous, we find that they can vastly outperform the best available heuristics for generating training sequences.
 
=== Nov 7: Cancelled ===
 
 
=== Nov 21: Xiaowu Dai (Statistics) ===
TBD
 
TBD




<br>
==Past Semesters==
*[[SIAM Seminar Fall 2024|Fall 2024]]
*[https://wiki.math.wisc.edu/index.php/SIAM_Spring_2024 Spring 2024]
*[[SIAM Fall 2023|Fall 2023]]
*[[SIAM Spring 2023|Spring 2023]]
*[[SIAM Seminar Fall 2022|Fall 2022]]
*[[Spring 2022 SIAM|Spring 2022]]
*[[SIAM Student Chapter Seminar/Fall2021|Fall 2021]]
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]

Latest revision as of 15:16, 24 January 2025


Spring 2025

Date Location Speaker Title


Abstracts

Past Semesters

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