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신체질량지수 군별 비합병 만삭 임산부의 분만 2개월 후 체중감소에 관한 연구
김화원 ( Kim Hwa Won ),김영신 ( Kim Yeong Sin ),유재형 ( Yu Jae Hyeong ),이정경 ( Lee Jeong Gyeong ),강창성 ( Kang Chang Seong ),박성철 ( Park Seong Cheol ),김영제 ( Kim Yeong Je ),박종규 ( Park Jong Gyu ),김해성 ( Kim Hae Seon 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.12
목적 : 분만 2개월 후의 체중감소의 평균, 표준편차 및 백분위수를 구하고, 임신 전 신체질량지수 군과 연관성을 분석하고자 하였다. 연구 방법 : 2002년 1월 1일부터 2002년 12월 31일까지 한일병원 산부인과에서 분만하였고, 분만 후 50일에서 70일 사이에 다시 방문한 비합병 단태출산 175예를 대상으로 하였으며, 임신 전 신체질량지수 (BMI)에 의해 3개군으로 나누어 비교하였다. 결과 : 기간 중 평균 체중감소는 9.46±3.42 kg이었 Objective : To determine the mean two-month-postpartum weight loss, standard deviations and the 10th, 25th, 50th, 75th, and 90th percentiles in the uncomplicated term pregnancy and to examine association between prepregnancy body mass index and two-month-
상변화물질PCM을 이용한 소방배관의 동파방지에 관한 연구
김영해(Young Hae Kim),김해빈(Hae Bin Kim),김동규(Dong Gyu Kim),김민수(Min Soo Kim),김지형(Ji Hyeong Kim),김회률(Hoi Youl Kim),금종수(Jong Soo Kum) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This study is intended to prevent of the freezing of fire piping when it is exposed to a certain temperature or below by unsing the properties of PCM that is absorbing or discharging latent heat by phase changing at the certain temperature. It verified PCM’s prevention effect of freeze through numerical analysis and measrement.
Jong-Hae Kim(김종해),Do-Cang Oh(오도창) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
This paper considers the problem of robust stability for uncertain discrete-time interval time-varying delayed descriptor systems using any combinations of quantization and overflow nonlinearities. First, delay-dependent linear matrix inequality (LMI) condition for discrete-time descriptor systems with time-varying delay and quantization/overflow nonlinearities is presented by proper Lyapunov function. Second, it is shown that the obtained condition can be extended into descriptor systems with uncertainties such as norm-bounded parameter uncertainties and polytopic uncertainties by some useful lemmas. The proposed results can be applied to both descriptor systems and non-descriptor systems. Finally, numerical examples are shown to illustrate the effectiveness and less conservativeness.
김종해(Jong-Hae Kim),오도창(Do-Cang Oh) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
In this paper, we consider the problem of a robust passive filtering with low-order for discrete-time singular systems with polytopic uncertainties. A BRL(bounded real lemma) for robust passivity with a dissipativity of discrete-time uncertain singular systems is derived. A low-order robust passive filter design method is proposed by new reduced-order method and LMI(linear matrix inequality) technique on the basis of the obtained BRL. Finally, illustrative examples are presented to show the applicability of the proposed method.
상태와 입력에 시변 시간지연을 가지는 불확실 이산시간 특이시스템의 지연종속 강인 안정화 및 비약성 제어
김종해(Jong-Hae Kim) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.2
This paper deals with the design problem of robust stabilization and non-fragile controller for discrete-time singular systems with parameter uncertainties and time-varying delays in state and input by delay-dependent Linear Matrix Inequality (LMI) approach. A new delay-dependent bounded real lemma for singular systems with time-varying delays is derived. Robust stabilization and robust non-fragile state feedback control laws are proposed, which guarantees that the resultant closed-loop system is regular, causal and stable in spite of time-varying delays, parameter uncertainties, and controller gain variations. A numerical example is given to show the validity of the design method.
이산시간 지연 불확실 특이시스템의 지연 종속 및 변수 종속 강인 안정성
김종해(Jong-Hae Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.4
The problem of delay-dependent and parameter-dependent robust stability condition for discrete-time uncertain singular systems with polytopic uncertainty and interval time-varying delay is considered. A new robust stability condition based on parameter-dependent Lyapunov function is derived in terms of LMI (linear matrix inequality). Moreover, the proposed robust stability condition is a general condition for both singular and non-singular systems. A numerical example is presented to demonstrate the effectiveness of the proposed method.
변수 불확실성과 시변 시간지연을 가지는 특이시스템의 지연 종속 강인 비약성 안정화
金鍾海(Jong-Hae Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.10
In this paper, we deal with the problem of delay-dependent robust and non-fragile stabilization for descriptor systems with parameter uncertainties and time-varying delays on the basis of strict LMI (linear matrix inequality) technique. Also, the considering controller is composed of multiplicative uncertainty. The delay-dependent robust and non-fragile stability criterion without semi-definite condition and decomposition of system matrices is obtained. Based on the criterion, the problem is solved via state feedback controller, which guarantees that the resultant closed-loop system is regular, impulse free and stable in spite of all admissible parameter uncertainties, time-varying delays, and controller fragility. Numerical examples are presented to demonstrate the effectiveness of the proposed method.
시변 시간지연을 가지는 불확실 특이시스템의 지연 종속 강인 H<SUB>∞</SUB> 필터링
김종해(Jong-Hae Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.9
This paper is concerned with the problem of delay-dependent robust H∞ filtering for uncertain descriptor systems with time-varying delay. The considering uncertainty is convex compact set of polytoic type. The purpose is the design of a linear filter such that the resulting filtering error descriptor system is regular, impulse-free, and asymptotically stable with H∞ norm bound. By establishing a finite sum inequality based on quadratic terms, a new delay-dependent bounded real lemma (BRL) for delayed descriptor systems is derived. Based on the derived BRL, a robust H∞ filter is designed in terms of linear matrix inequaltity (LMI). Numerical examples are given to illustrate the effectiveness of the proposed method.