[Eng-div] Fwd: [Accelerator_staff] Accelerator Seminar: 4/15/16 - Jingwei Hu

[Gayle Sundeen]

From: "Audrey Nichols" <anichols at jlab.org> 
Sent: Friday, April 15, 2016 8:00:00 AM 
Subject: Re: [Accelerator_staff] Accelerator Seminar: 4/15/16 - Jingwei Hu 

Reminder! 



From: "Audrey Barron" <anichols at jlab.org> 
To: "acc staff" <acc_staff at jlab.org>, "FEL Staff" <fel-staff at jlab.org> 
Cc: "Jingwei Hu" <jingweihu at purdue.edu> 
Sent: Thursday, April 7, 2016 4:00:00 PM 
Subject: [Accelerator_staff] Accelerator Seminar: 4/15/16 - Jingwei Hu 

ACCELERATOR SEMINAR 

A Fast Butterfly Algorithm for Generalized Radon Transforms 

Jingwei Hu 
Perdue University 



The fast butterfly algorithm, as originally proposed by Candes , Demanet , and Ying, is used to accelerate the $N$-body interaction with oscillatory kernel: $u(x)=\ sum_y e^{2\pi i \phi( x,y )} g(y)$. In this talk, we consider its application to the Radon transform --- an integral transform taken along arbitrary parameterized sets of smooth curves/surfaces whose application includes imaging, wave/Maxwell equations, and retarded effect in the relativistic E-M fields. The basic idea to reformulate the transform as an oscillatory integral operator and to construct a blockwise low-rank approximation of the kernel function. For 2D problem, the algorithm runs in complexity $O(N^2\log N)$ as apposed to $O(N^3)$ of the direct time-domain integration. 




Friday, April 15, 2016 


11:00 a.m. 


CEBAF Center, Room L102 





Seminar archives are found here: https://www.jlab.org/accel/seminars.html 




------ 
Audrey N. Barron 
Administrative Assistant 
Center for Advanced Studies of Accelerators 
Jefferson Lab 
757-269-7327 
anichols at jlab.org / www.jlab.org 



_______________________________________________ 
Accelerator_staff mailing list 
Accelerator_staff at jlab.org 
https://mailman.jlab.org/mailman/listinfo/accelerator_staff 

_______________________________________________ 
Accelerator_staff mailing list 
Accelerator_staff at jlab.org 
https://mailman.jlab.org/mailman/listinfo/accelerator_staff 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/eng-div/attachments/20160415/fb864635/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: JLabEmailSig.png
Type: image/png
Size: 2227 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/eng-div/attachments/20160415/fb864635/attachment.png>