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구민성,최호림,임종태 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4
In this paper, feedback linearization method is proposed for nonlinear systems with a time varying delay in states. The diffeomorphism is presented to linearize the state-delayed nonlinear system if time-varying delay is known. Furthermore, we propose a control scheme to stabilize the approximate feedback linearizable system under the proposed conditions if the first order derivative of time-varying delay and the parametric uncertainties are finite and measurable.
관동의대 국시 및 학업 성적에 영향을 미치는 요인 분석
구민성,문동석,김상아,박웅섭 관동대학교 의과학연구소 2001 關東醫大學術誌 Vol.5 No.1
This study purposed for analysis of the factors affecting Korean Medical License Examination(KMLE) grades in Kwandong University Medical College students. Twenty-seven graduate students were evaluated with stress perception scales and socio-economic state evaluation scales. The results were as follows: 1.The students feel high stress in 'Recent pressure in past one week', 'pressure in interpersonal relationships' and 'economic pressure'. 2.The scores in 'Recent pressure in past one week', 'pressure in interpersonal relationships' and 'occupational pressure' were in significant correlations with the KMLE scores. These results suggest that the Kwandong Medical students feel stress in chiefly in the interpersonal relationships and these factors affecting KMLE scores.
Global Regulation of a Class of Nonlinear Systems with High-order Triangular Type Nonlinearity
구민성,최호림,임종태 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4
The problem of global regulation is investigated for a class of nonlinear systems which contain some high-order terms. We propose a high-order scaling state-feedback controller with appropriate dynamic gains. Compared to existing results, the condition on the nonlinearity is flexible due to the freedom of choosing the bounding positive function of the nonlinearity. Thus, the nonlinear systems with some high-order nonlinearities which do not belong to existing conditions can be globally regulated.
구민성,최호림,Koo, Min-Sung,Choi, Ho-Lim Institute of Control 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
We present an output feedback controller for a class of nonlinear systems with uncertain nonlinearity and sensor noise. The sensor noise has both a finite constant component and a time-varying component such that its integral function is finite. The new design and analysis method is based on the matrix inequality approach. With our proposed controller, the states and output can be ultimately bounded even though the structure of nonlinearity is more general than that in the existing results.
Fast Regulation Control of a Class of Input-delayed Linear Systems with Pre-feedback
구민성,최호림 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1
A control problem of a class of input-delayed linear systems is considered in this paper. Due to the delay t in the input, any designed feedback controller can only be engaged after t≥ τ . Then, this can become the cause of slow regulation since any feedback information cannot be available during the delay. So, the initial function defined for -τ ≤ t ≤ 0 is engaged as an ‘initial non-feedback input’ for 0 ≤ t ≤ τ, which governs the system behavior during this initial time period. There have been numerous research results on the control of input-delayed linear systems by far. Yet, there have been no results on the examination and design of this initial function. Utilizing a time optimal control in the existing results, we show that if some pre-feedback as the initial function is engaged, the system response of the input-delayed linear system can be much improved, and a bang-bang input function is a good candidate as a pre-feedback which can provide better starting state values for the state feedback controller in order to perform the fast regulation. Two examples are given for the illustration of our results.
A Global Regulation Method of Nonlinear Systems with Unbounded Parameters Under State Feedback Frame
구민성,최호림,Koo, Min-Sung,Choi, Ho-Lim Institute of Control 2016 제어·로봇·시스템학회 논문지 Vol.22 No.3
In this paper, we consider a regulation problem of nonlinear systems under two triangular conditions where there possibly exist unbounded parameters in the systems. We propose a state feedback controller with dynamic gains in order to deal with unbounded parameters based on the condition of the time-varying rate of the growing parameter. The analysis of our control scheme is carried out by Lyapunov stability method. Our control method is verified by simulation results.
구민성,최호림,Koo, Min-Sung,Choi, Ho-Lim Institute of Control 2016 제어·로봇·시스템학회 논문지 Vol.22 No.7
We deal with the regulation problem of nonlinear systems with time-varying delays in both the states and input. A new state feedback controller with dynamic gains is developed based on matrix inequality and non-predictor methods. The proposed control scheme is analyzed using the Razumikhin theorem, and its effectiveness is demonstrated with simulation results.