Computations in Science Seminars
Oct 2019
16
Wed 12:15
Rebecca Kramer-Bottiglio, Yale University
e-mail:
Host: William Irvine ()
Organizer: Steven Strong ()
From Particles to Parts—Building Multifunctional Robots with Programmable Robotic Skins

Robots generally excel at specific tasks in structured environments, but lack the versatility and adaptability required to interact-with and locomote-within the natural world. To increase versatility in robot design, my research group is developing robotic skins that can wrap around arbitrary deformable objects to induce the desired motions and deformations. Our robotic skins integrate programmable composites to embed actuation and sensing into a planar substrate that may be applied-to, removed-from, and transferred-between different objects to create a multitude of controllable robots with different functions to accommodate the demands of different environments. We have shown that attaching the same robotic skin to a deformable object in different ways, or to different objects, leads to unique motions. Further, we have shown that combining multiple robotic skins enables complex motions and functions. During this talk, I will demonstrate the versatility of this soft robot design approach by showing robotic skins in a wide range of applications - including manipulation tasks, locomotion, and wearables - using the same 2D robotic skins reconfigured on the surface of various 3D soft, inanimate objects.

Oct 2019
23
Wed 12:15
David Schwab, CUNY
e-mail:
Host: Arvind Murugan ()
Organizer: Grayson Jackson ()
How noise affects the Hessian spectrum in overparameterized neural networks

Stochastic gradient descent (SGD) forms the core optimization method for deep neural networks, contributing to their resurgence. While some theoretical progress has been made, it remains unclear why SGD leads the learning dynamics in overparameterized networks to solutions that generalize well. Here we show that for overparameterized networks with a degenerate valley in their loss landscape, SGD on average decreases the trace of the Hessian of the loss. We also show that isotropic noise in the non-degenerate subspace of the Hessian decreases its determinant. In addition to explaining SGDs role in sculpting the Hessian spectrum, this opens the door to new optimization approaches that guides the model to solutions with better generalization. We test our results with experiments on toy models and deep neural networks.

Oct 2019
30
Wed 12:15
Ben Nachman, Lawrence Berkeley National Laboratory
e-mail:
Host: David Miller ()
Organizer: Peter Chung ()
Nov 2019
6
Wed 12:15
Bill Baker, Skidmore, Owings & Merrill LLP
e-mail:
Host: Heinrich Jaeger ()
Organizer: Grayson Jackson ()
Maxwell, Rankine, Airy and Modern Structural Engineering Design

The lecture will review some of the seminal contributions of James Clerk Maxwell, William John Macquorn Rankine and George Biddell Airy to the theory of structures and how those theories can be applied to modern structural engineering design. William F. Baker is a consulting structural engineering partner at Skidmore, Owings & Merrill LLP where he has led the structural engineering practice for more than 20 years. Bill is best known for the development of the “buttressed core” structural system for the Burj Khalifa, the world’s tallest manmade structure. In addition to his work on supertall buildings, Bill’s expertise also extends to long-span roof structures and specialty structures. He has also collaborated with numerous artists, including Jamie Carpenter, Iñigo Manglano-Ovalle, James Turrell, and Jaume Plensa. Bill is an Honorary Professor at the University of Cambridge; he has received honorary doctorates from the University of Stuttgart, Heriot-Watt University, the Illinois Institute of Technology and the University of Missouri; the Gold Medal from the Institution of Structural Engineers (IStructE), the American Society of Civil Engineers (ASCE) Lifetime Award for Design; the Gustav Magnel Gold Medal from the University of Ghent; the Fazlur Rahman Khan Medal from the Council on Tall Buildings and Urban Habitat; and the Fritz Leonhardt Preis (Germany). He is a Fellow of both the ASCE and the IStructE, and a member of the National Academy of Engineering (USA) and an International Fellow of the Royal Academy of Engineering (United Kingdom). Bill is currently collaborating with faculty members from MIT, Cambridge, ETH/Zurich, and EPFL/Lausanne on a book intended to make Maxwell’s structural engineering work accessible to the modern engineer.

Nov 2019
13
Wed 12:15
Orit Peleg, University of Colorado
e-mail:
Host: Arvind Murugan ()
Organizer: Yuqing Qiu ()
Nov 2019
20
Wed 12:15
OPEN
Dec 2019
4
Wed 12:15
Irmgard Bischofberger, MIT
e-mail:
Host: Sid Nagel ()
Organizer: Elizabeth Lee ()
Dec 2019
11
Wed 12:15
W. Benjamin Rogers, Brandeis University
e-mail:
Host: Arvind Murugan ()
Jan 2020
8
Wed 12:15
Bob Rosner, University of Chicago
e-mail:
Host: William Irvine ()
Jan 2020
15
Wed 12:15
Wim van Rees, MIT
e-mail:
Host: William Irvine ()
Jan 2020
22
Wed 12:15
Rebecca Schulman, Johns Hopkins University
e-mail:
Host: Arvind Murugan ()
Jan 2020
29
Wed 12:15
Alex Levine, UCLA
e-mail:
Host: Vincenzo Vitelli ()
Feb 2020
5
Wed 12:15
Justin Burton, Emory University
e-mail:
Host: Sid Nagel ()
Feb 2020
12
Wed 12:15
Jeremy England, GSK AI
e-mail:
Host: Arvind Murugan ()
Feb 2020
19
Wed 12:15
OPEN
Feb 2020
26
Wed 12:15
OPEN
Mar 2020
11
Wed 12:15
OPEN
Mar 2020
18
Wed 12:15
OPEN
Mar 2020
25
Wed 12:15
OPEN
Apr 2020
1
Wed 12:15
OPEN
Apr 2020
8
Wed 12:15
Alexandra Zidovska, NYU
e-mail:
Host: Margaret Gardel ()
Apr 2020
15
Wed 12:15
OPEN
Apr 2020
22
Wed 12:15
OPEN
Apr 2020
29
Wed 12:15
OPEN
May 2020
6
Wed 12:15
Sabetta Matsumoto, Georgia Tech
e-mail:
Host: Arvind Murugan ()
May 2020
13
Wed 12:15
OPEN
May 2020
20
Wed 12:15
OPEN
May 2020
27
Wed 12:15
OPEN
Jun 2020
3
Wed 12:15
OPEN