98 citations · 580 across the 28 of their papers we have counts for
29 papers
Stability of Slow-Fast Nonlinear Dynamics: Moving Equilibrium Case
G. Q. Bao Tran, Daniel Liberzon, Hyungbo Shim
We study the stability of nonlinear systems subject to both slow and fast time variations. Both can have discontinuities, covering switched systems as a special case. The fast vari…
Stability of Slow-Fast Nonlinear Dynamics: Non-Periodic Case
G. Q. Bao Tran, Daniel Liberzon, Hyungbo Shim
We present sufficient conditions for the semi-global exponential stability of nonlinear systems whose dynamics have both slow and fast time variations. Unlike most existing results…
Inverse Learning-Based Output Feedback Control of Nonlinear Systems with Verifiable Guarantees
Yeongjun Jang, Hamin Chang, Heein Park +3
In this paper, we present a data-driven output feedback controller for nonlinear systems that achieves practical output regulation, using noise-free input/output measurement data.…
Blended Dynamics and Emergence in Open Quantum Networks
Qinghao Wen, Zihao Ren, Lei Wang +2
In this paper, we develop a blended dynamics framework for open quantum networks with diffusive couplings. The network consists of qubits interconnected through Hamiltonian couplin…
Adaptation of Parameters in Heterogeneous Multi-agent Systems
Hyungbo Shim, Jin Gyu Lee, B. D. O. Anderson
This paper proposes an adaptation mechanism for heterogeneous multi-agent systems to align the agents' internal parameters, based on enforced consensus through strong couplings. Un…
Determination of Bandwidth of Q-filter in Disturbance Observers to Guarantee Transient and Steady State Performance under Measurement Noise
Gaeun Kim, Hyungbo Shim
Q-filter-based disturbance observer (DOB) is one of the most widely used robust controller due to its design simplicity. Such simplicity arises from that reducing the time constant…
Mode Consensus Algorithms With Finite Convergence Time
Chao Huang, Hyungbo Shim, Siliang Yu +1
This paper studies the distributed mode consensus problem in a multi-agent system, in which the agents each possess a certain attribute and they aim to agree upon the mode (the mos…
Data-Driven Inverse of Linear Systems and Application to Disturbance Observers
Yongsoon Eun, Jaeho Lee, Hyungbo Shim
This work develops a data-based construction of inverse dynamics for LTI systems. Specifically, the problem addressed here is to find an input sequence from the corresponding outpu…
Model Reference Gaussian Process Regression: Data-Driven Output Feedback Controller
Hyuntae Kim, Hamin Chang, Hyungbo Shim
Data-driven controls using Gaussian process regression have recently gained much attention. In such approaches, system identification by Gaussian process regression is mostly follo…
Data-driven Output-feedback Predictive Control: Unknown Plant's Order and Measurement Noise
Nam H. Jo, Hyungbo Shim
The aim of this paper is to propose a new data-driven control scheme for multi-input-multi-output linear time-invariant systems whose system model are completely unknown. Using a n…
Blended Dynamics Approach to Distributed Optimization: Sum Convexity and Convergence Rate
Seungjoon Lee, Hyungbo Shim
This paper studies the application of the blended dynamics approach towards distributed optimization problem where the global cost function is given by a sum of local cost function…
Disturbance Observer
Hyungbo Shim
Disturbance observer is an inner-loop output-feedback controller whose role is to reject external disturbances and to make the outer-loop baseline controller robust against plant's…
Zero-dynamics Attack, Variations, and Countermeasures
Hyungbo Shim, Juhoon Back, Yongsoon Eun +2
This chapter presents an overview on actuator attacks that exploit zero dynamics, and countermeasures against them. First, zero-dynamics attack is re-introduced based on a canonica…
Design of heterogeneous multi-agent system for distributed computation
Jin Gyu Lee, Hyungbo Shim
A group behavior of a heterogeneous multi-agent system is studied which obeys an "average of individual vector fields" under strong couplings among the agents. Under stability of t…
Synchronization with prescribed transient behavior: Heterogeneous multi-agent systems under funnel coupling Extended arXiv version
Jin Gyu Lee, Stephan Trenn, Hyungbo Shim
In this paper, we introduce a nonlinear time-varying coupling law, which can be designed in a fully decentralized manner and achieves approximate synchronization with arbitrary pre…
Decentralized Design and Plug-and-Play Distributed Control for Linear Multi-Channel Systems
Taekyoo Kim, Donggil Lee, Hyungbo Shim
We propose a distributed control, in which many identical control agents are deployed for controlling a linear time-invariant plant that has multiple input-output channels. Each co…
Fully Distributed Resilient State Estimation based on Distributed Median Solver
Jin Gyu Lee, Junsoo Kim, Hyungbo Shim
In this paper, we present a scheme of fully distributed resilient state estimation for linear dynamical systems under sensor attacks. The proposed state observer consists of a netw…
Dynamic controller that operates over homomorphically encrypted data for infinite time horizon
Junsoo Kim, Hyungbo Shim, Kyoohyung Han
In this paper, we present a dynamic feedback controller that computes the next state and the control signal over encrypted data using homomorphic properties of cryptosystems, whose…
Distributed Algorithm for Economic Dispatch Problem with Separable Losses
Seungjoon Lee, Hyungbo Shim
Economic dispatch problem for a networked power system has been considered. The objective is to minimize the total generation cost while meeting the overall supply-demand balance a…
Comprehensive Introduction to Fully Homomorphic Encryption for Dynamic Feedback Controller via LWE-based Cryptosystem
Junsoo Kim, Hyungbo Shim, Kyoohyung Han
The cryptosystem based on the Learning-with-Errors (LWE) problem is considered as a post-quantum cryptosystem, because it is not based on the factoring problem with large primes wh…
Output feedback based event-triggered sliding mode control for delta operator systems
Kiran Kumari, Bijnan Bandyopadhyay, Kyung-Soo Kim +1
In this paper, we present an output feedback based design of event-triggered sliding mode control for delta operator systems. For discrete-time systems, multi-rate output sampling…
Robust Stability of Discrete-time Disturbance Observers: Understanding Interplay of Sampling, Model Uncertainty and Discrete-time Designs
Gyunghoon Park, Chanhwa Lee, Youngjun Joo +1
In this paper, we address the problem of robust stability for uncertain sampled-data systems controlled by a discrete-time disturbance observer (DT-DOB). Unlike most of previous wo…
State Estimation and Tracking Control for Hybrid Systems by Gluing the Domains
Jisu Kim, Hyungbo Shim, Jin Heon Seo
We study the design problems of state observers and tracking controllers for a class of hybrid systems whose state jumps. The idea is to utilize the well-known method of gluing the…
Detection of Sensor Attack and Resilient State Estimation for Uniformly Observable Nonlinear Systems having Redundant Sensors
Junsoo Kim, Chanhwa Lee, Hyungbo Shim +2
This paper presents a detection algorithm for sensor attacks and a resilient state estimation scheme for a class of uniformly observable nonlinear systems. An adversary is supposed…