Fall 2018

September 19, 2018

Automated As-Is Modelling of Industrial Facilities

Speaker: Eva Agapaki (University of Cambridge)

The cost of modelling existing industrial facilities is currently considered to counteract the benefits of the models in maintaining and retrofitting a facility. 90% of the modelling cost is typically spent on labour for converting point...

September 26, 2018

Microgrids for Resilient Electricity Distribution Networks

Speaker: Devendra Shelar (MIT Civil and Environmental Engineering)

We propose a new approach for utilizing distributed energy resources (DERs) and microgrids for improving the resilience of electricity distribution networks to correlated cyber-physical failures. Such failures can result from random faults (...

October 3, 2018

Direct Runge Kutta Discretization Achieves Acceleration

Speaker: Jingzhao Zhang (LIDS)

We study gradient-based optimization methods obtained by directly discretizing a second-order ordinary differential equation (ODE) related to the continuous limit of Nesterov's accelerated gradient method. When the function is smooth enough...

October 10, 2018

Probability Distributions on Posets: An Application to Security Games

Speaker: Mathieu Dahan (MIT Center for Computational Engineering)

We study an abstract problem regarding probability distributions on posets. The problem is to resolve the existence of a probability distribution over subsets of a poset, such that a set of constraints involving marginal probabilities of the...

October 17, 2018

Convex Restriction: A Sufficient Convex Condition for Solvability and Feasibility of Nonlinear Equations

Speaker: Dongchan Lee (Mechanical Engineering)

Convex restriction identifies the convex subset of a general nonconvex feasible set described by nonlinear equality and inequality constraints. Nonlinear optimization problems often rely on convex relaxations, which can be interpreted as...

October 24, 2018

Chance-constrained Unit Commitment

Speaker: Xinbo Geng (Texas A&M University)

Motivated by the uncertainties from deepening penetration of renewable energy resources in power systems, we study the day-ahead scheduling problem in electricity markets. We formulate the chance-constrained unit commitment problem...

October 31, 2018

Dynamic Pricing under a Static Calendar

Speaker: Jinglong Zhao (IDSS)

Our work is based on the classical dynamic pricing problem. From our collaborations with a large Consumer Packaged Goods company, we have found that while they appreciate the advantages of dynamic pricing, it is operationally beneficial for...

November 7, 2018

Robust PCA over Dynamic Systems: A Case of Forced Oscillation Localization

Speaker: Tong Huang (Texas A&M University)

This talk concerns about developing physically interpretable algorithms for large dynamical systems such as the power grid. The problem of source localization is formulated as one of identifying the sparse component in robust principal...

November 14, 2018

High-Dimensional Precision Matrix Estimation Under Total Positivity

Speaker: Yuhao Wang (LIDS & EECS)

We consider the problem of estimating high-dimensional precision matrices for multivariate totally positive of order two (MTP2) distributions. Such distribution is of interest in financial econometrics, where the distribution of stock price...

November 20, 2018

Attracting Random Walks

Speaker: Julia Gaudio (LIDS & ORC)

We introduce the Attracting Random Walks model, which is an attractive interacting particle system. In the model, particles move between adjacent vertices of a graph G, with transition probabilities that depend positively on particle counts...

November 28, 2018

Delay and Stability Tradeoffs in Distributed Service Systems with Redundancy

Speaker: Martín Zubeldía (LIDS)

We consider a large distributed service system with N servers that have random service rates, where there is a stream of incoming jobs that consist of K<<N identical tasks that can be executed in parallel. We assume that the K tasks...

December 5, 2018

Minimal Realization Problems in Jump Linear System: Some Preliminaries

Speaker: Tuhin Sarkar (LIDS & IDSS)

We address two fundamental problems in the context of jump linear systems (JLS). The first problem is concerned with characterizing the minimal state space dimension solely from input-output pairs and without any knowledge of the number of...

December 12, 2018

Dispatch with Energy Storage through Constructing the Optimal Cost-to-go Function

Speaker: Bolun Xu (MIT Energy Initiative)

The stochastic future can be reduced to a cost-to-go value function of the system state variable for fast and optimal real-time decision making, following the concept of dynamic programming, this serves as a potential solution to the ongoing...