Search Results for author: Charles Dawson

Found 4 papers, 1 papers with code

Active Disruption Avoidance and Trajectory Design for Tokamak Ramp-downs with Neural Differential Equations and Reinforcement Learning

no code implementations14 Feb 2024 Allen M. Wang, Oswin So, Charles Dawson, Darren T. Garnier, Cristina Rea, Chuchu Fan

The policy training environment is a hybrid physics and machine learning model trained on simulations of the SPARC primary reference discharge (PRD) ramp-down, an upcoming burning plasma scenario which we use as a testbed.

Adversarial optimization leads to over-optimistic security-constrained dispatch, but sampling can help

no code implementations10 Oct 2023 Charles Dawson, Chuchu Fan

We show that adversarial optimization is liable to severely overestimate the robustness of the optimized dispatch (when the adversary encounters a local minimum), leading the operator to falsely believe that their dispatch is secure.

Adversarial Attack

AutoTAMP: Autoregressive Task and Motion Planning with LLMs as Translators and Checkers

3 code implementations10 Jun 2023 Yongchao Chen, Jacob Arkin, Charles Dawson, Yang Zhang, Nicholas Roy, Chuchu Fan

Rather than using LLMs to directly plan task sub-goals, we instead perform few-shot translation from natural language task descriptions to an intermediate task representation that can then be consumed by a TAMP algorithm to jointly solve the task and motion plan.

Motion Planning Task and Motion Planning +1

Safe Nonlinear Control Using Robust Neural Lyapunov-Barrier Functions

no code implementations14 Sep 2021 Charles Dawson, Zengyi Qin, Sicun Gao, Chuchu Fan

Safety and stability are common requirements for robotic control systems; however, designing safe, stable controllers remains difficult for nonlinear and uncertain models.

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