Past Events

Alma Mater

Friday, November 3, 2017 - 11:00am to 12:00pm
Columbia University
New York, NY 10027
United States

Data Science Institute | Sense, Collect & Move Data Center Seminar

Speaker: Steven Low, Caltech

Optimal power flow (OPF) is fundamental because it underlies numerous power system operation and planning problems. In this talk, I will give a sample of optimization problems in the management of a large network of distributed energy resources. The nonlinearity of power flow equations leads to the nonconvexity of OPF, one of the main computational challenges in power system applications. We describe a method to deal with nonconvexity through semidefinite relaxation. Semidefinite programs are hard to scale to large OPF problems. We describe a highly scalable distributed solution based on ADMM. These algorithms are offline in that they iterate until the computation has converged before applying the final solution to the grid, and are therefore not suitable for real-time optimization of distributed energy resources at scale. We describe realtime OPF that explicitly exploits the network as a power flow equation solver and characterize its performance in tracking changing network conditions. Finally, in practice, not all network nodes have sensors or can be controlled. We characterize controllability and observability of power flow dynamics in terms of the spectral properties of its Laplacian matrix. This characterization can be used to optimize the placement of sensors and actuators in the grid.

Wednesday, November 1, 2017 - 4:30pm to 6:00pm
United States

Friday, October 20, 2017 - 2:30pm to 3:30pm
New York, NY 10027
United States

Data Science Institute | Sense, Collect & Move Data Center Seminar

Speaker: Mingoo Seok, Columbia University

Friday, October 13, 2017 - 2:30pm to 3:30pm
United States

Data Science Institute | Sense, Collect & Move Data Center Seminar

Speaker: Jonathan Ostrometzky, Tel Aviv University

Tuesday, October 10, 2017 - 8:00am to 5:00pm
New Jersey Institute of Technology, NJIT Campus Center Atrium
150 Bleeker Street
Newark, NJ 07103
United States
Wednesday, October 4, 2017 - 3:00pm to 4:00pm
Schapiro Hall (CEPSR) Davis Auditorium
Columbia University
New York, NY 10027
United States

Columbia Data Science Institute Industry Innovation Seminars


Presented by Arthur Franke and Carl Barrelet

Wednesday, October 4, 2017 - 10:00am to 11:00am
United States

Delivering Disruption

Dr. Stefanie Tompkins, Acting Deputy Director, Defense Advanced Research Projects Agency

Tuesday, October 3, 2017 - 2:45pm to 3:45pm
Mudd Hall, 500 W. 120 St.
Columbia University
New York, NY 10027
United States

The Reverse Time Migration Method for Inverse Scattering Problems

Zhiming Chen, from the Chinese Academy of Sciences, will present a talk at the Applied Mathematics Colloquium.

Host: Qiang Du

Tuesday, October 3, 2017 - 11:00am to 12:15pm
Schapiro Hall (CEPSR) Davis Auditorium
Columbia University
New York, NY 10027
United States

Blue Waters: A Super System for Highly Productive Frontier Science -- Experiences and Lessons Learned

Dr. William T.C. Kramer | National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign

Friday, September 22, 2017 - 10:00am to 11:00am
United States

What Can Deep Learning Learn from Linear Regression

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