Search Results for author: Fangzhou Liu

Found 12 papers, 1 papers with code

General SIS diffusion process with indirect spreading pathways on a hypergraph

no code implementations1 Jun 2023 Shaoxuan Cui, Fangzhou Liu, Hildeberto Jardón-Kojakhmetov, Ming Cao

While conventional graphs only characterize pairwise interactions, higher-order networks (hypergraph, simplicial complex) capture multi-body interactions, which is a potentially more suitable modeling framework for a complex real system.

Distributed Coverage Control of Constrained Constant-Speed Unicycle Multi-Agent Systems

no code implementations12 Apr 2023 Qingchen Liu, Zengjie Zhang, Nhan Khanh Le, Jiahu Qin, Fangzhou Liu, Sandra Hirche

This paper proposes a novel distributed coverage controller for a multi-agent system with constant-speed unicycle robots (CSUR).

A Persistent-Excitation-Free Method for System Disturbance Estimation Using Concurrent Learning

1 code implementation12 Apr 2023 Zengjie Zhang, Fangzhou Liu, Tong Liu, Jianbin Qiu, Martin Buss

A simulation study on epidemic control shows that the proposed method produces higher estimation precision than the conventional disturbance observer when PE is not satisfied.

Simultaneous Recursive Identification of Parameters and Switching Manifolds Identification of Discrete-Time Switched Linear Systems

no code implementations7 Mar 2023 Zengjie Zhang, Yingwei Du, Tong Liu, Fangzhou Liu, Martin Buss

Thirdly, techniques of incremental support vector machine are applied to develop the recursive algorithm to estimate the system switching manifolds, with its stability proven by a Lynapunov-based method.

Discrete-time Layered-network Epidemics Model with Time-varying Transition Rates and Multiple Resources

no code implementations15 Jun 2022 Shaoxuan Cui, Fangzhou Liu, Hildeberto Jardón-Kojakhmetov, Ming Cao

This paper studies a discrete-time time-varying multi-layer networked SIWS (susceptible-infected-water-susceptible) model with multiple resources under both single-virus and competing multi-virus settings.

Adaptive Observer for a Class of Systems with Switched Unknown Parameters Using DREM

no code implementations30 Mar 2022 Tong Liu, Zengjie Zhang, Fangzhou Liu, Martin Buss

These responses depend on the unknown states at switching instants (SASI) and constitute an additive disturbance to the parameter estimation, which obstructs parameter convergence to zero.

Data Informed Residual Reinforcement Learning for High-Dimensional Robotic Tracking Control

no code implementations28 Oct 2021 Cong Li, Fangzhou Liu, Yongchao Wang, Martin Buss

The learning inefficiency of reinforcement learning (RL) from scratch hinders its practical application towards continuous robotic tracking control, especially for high-dimensional robots.

reinforcement-learning Reinforcement Learning (RL)

FedXGBoost: Privacy-Preserving XGBoost for Federated Learning

no code implementations20 Jun 2021 Nhan Khanh Le, Yang Liu, Quang Minh Nguyen, Qingchen Liu, Fangzhou Liu, Quanwei Cai, Sandra Hirche

Federated learning is the distributed machine learning framework that enables collaborative training across multiple parties while ensuring data privacy.

Federated Learning Privacy Preserving

Model-Free Incremental Adaptive Dynamic Programming Based Approximate Robust Optimal Regulation

no code implementations4 May 2021 Cong Li, Yongchao Wang, Fangzhou Liu, Qingchen Liu, Martin Buss

This paper presents a new formulation for model-free robust optimal regulation of continuous-time nonlinear systems.

Off-Policy Risk-Sensitive Reinforcement Learning Based Constrained Robust Optimal Control

no code implementations10 Jun 2020 Cong Li, Qingchen Liu, Zhehua Zhou, Martin Buss, Fangzhou Liu

By introducing pseudo controls and risk-sensitive input and state penalty terms, the constrained robust stabilization problem of the original system is converted into an equivalent optimal control problem of an auxiliary system.

reinforcement-learning Reinforcement Learning (RL)

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