Young-Hun Lim

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This numerical study presents a detailed optimal control design based on the general finite element approach for the integrated design of a structure and its control system. Linear quadratic (LQ) theory with output feedback is considered on the basis of the state space model of the system. Three-dimensional finite elements are used to model the smart(More)
In this paper, we develop iterative learning control (ILC) algorithms when the final states of previous iteration are equal to the initial states of current iteration, which is called state alignment. When a new iteration begins along continuous time domain without stopping for a reset, the typical ILC algorithm is modified using dirac-delta function such(More)
— In this paper, we consider a formation keeping problem for a satellite formation flying system. The relative motion dynamics is designed with polytopic uncertainties by considering elliptical reference orbit, noncoplarnar formation and unknown angular rate, angular acceleration within some boundary. We propose a composite nonlinear feedback control law(More)
This paper consider a standard consensus algorithm under output saturations. In the presence of output saturations, global consensus can not be realized due to the existence of stable, unachievable equilibrium points for the consensus. Therefore, this paper investigates necessary and sufficient initial conditions for the achievement of consensus, that is an(More)
This paper provides a distributed coordination law for energy distribution in smart grid networks. A distributed optimization scheme is designed to meet supply-demand balance in overall network. To impose lower and upper boundaries in energy flow, we use high-order polynomials in the definition of cost functions. By using high-order polynomials, we could(More)