Search Results for author: Ryan K. Cosner

Found 8 papers, 4 papers with code

Bounding Stochastic Safety: Leveraging Freedman's Inequality with Discrete-Time Control Barrier Functions

2 code implementations9 Mar 2024 Ryan K. Cosner, Preston Culbertson, Aaron D. Ames

In contrast, this paper utilizes Freedman's inequality in the context of discrete-time control barrier functions (DTCBFs) and c-martingales to provide stronger (less conservative) safety guarantees for stochastic systems.

Input-to-State Stability in Probability

no code implementations28 Apr 2023 Preston Culbertson, Ryan K. Cosner, Maegan Tucker, Aaron D. Ames

Input-to-State Stability (ISS) is fundamental in mathematically quantifying how stability degrades in the presence of bounded disturbances.

Robust Safety under Stochastic Uncertainty with Discrete-Time Control Barrier Functions

no code implementations15 Feb 2023 Ryan K. Cosner, Preston Culbertson, Andrew J. Taylor, Aaron D. Ames

To this end, we leverage Control Barrier Functions (CBFs) which guarantee that a robot remains in a ``safe set'' during its operation -- yet CBFs (and their associated guarantees) are traditionally studied in the context of continuous-time, deterministic systems with bounded uncertainties.

End-to-End Imitation Learning with Safety Guarantees using Control Barrier Functions

1 code implementation21 Dec 2022 Ryan K. Cosner, Yisong Yue, Aaron D. Ames

Imitation learning (IL) is a learning paradigm which can be used to synthesize controllers for complex systems that mimic behavior demonstrated by an expert (user or control algorithm).

Imitation Learning

Safety of Sampled-Data Systems with Control Barrier Functions via Approximate Discrete Time Models

no code implementations22 Mar 2022 Andrew J. Taylor, Victor D. Dorobantu, Ryan K. Cosner, Yisong Yue, Aaron D. Ames

Existing design paradigms do not address the gap between theory (controller design with continuous time models) and practice (the discrete time sampled implementation of the resulting controllers); this can lead to poor performance and violations of safety for hardware instantiations.

Measurement-Robust Control Barrier Functions: Certainty in Safety with Uncertainty in State

1 code implementation28 Apr 2021 Ryan K. Cosner, Andrew W. Singletary, Andrew J. Taylor, Tamas G. Molnar, Katherine L. Bouman, Aaron D. Ames

The increasing complexity of modern robotic systems and the environments they operate in necessitates the formal consideration of safety in the presence of imperfect measurements.

Guaranteeing Safety of Learned Perception Modules via Measurement-Robust Control Barrier Functions

1 code implementation30 Oct 2020 Sarah Dean, Andrew J. Taylor, Ryan K. Cosner, Benjamin Recht, Aaron D. Ames

The guarantees ensured by these controllers often rely on accurate estimates of the system state for determining control actions.

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