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이호진 서울대학교 농업개발연구소 2001 농업생명과학연구 Vol.5 No.-
Precision Agriculture is a developing technique that can modify the current agricultural production system dramatically. To obtain basic information for precision agriculture of rice that can imporve nutrient use efficiency by plant, spatial variability of growths and yields for rice plant was investigated over a 0.4ha paddy field in Kimje, Korea. The plant variety was Oryza sativa L. cv. Samchonbyeo, a early maturing Japonica. Grid sampling was conducted with each of the 4.3m×10.2m plots in a 35m×112m paddy field. We collected several growth values at heading stage from each plots: plant height, dry weight, number of tillers, leaf area index(LAI), SPAD value, light transmission ratio(LTR). The grain yield was measured at harvest for each 8.6m×10.2m10.2m plots. Geostatistical analysis and mappings were performed by GS+Geostatics software. In 8.6m×10.2m grid yield variations resulted in 7.5ton/ha to 10.2ton/ha. The range of spatial dependence was about 40m for grain yield. Yield map was correlated with some growth maps showing spatial continuity in spatial variation. The spatial distribution of N recommendations for variable rate application showed similarity with the yield map in spatial variation.
이호진,홍계원 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.4
The stability of Bi-based superconducting wires cooled by a cryocooler was studied by considering the temperature dependency of critical current and electrical resistivity. The critical current measured in 23 K was about 7 times higher than that measured in liquid nitrogen of 77 K. The stability behavior of Bi based multifilament wires subjected to a thermal disturbance, which was simulated with a electric heater, was investigated by measuring the variation of voltage drop with time. Current sharing was occurred, and recovery to superconductivity was measured in the wire after removing heater power.
다수의 접합경계를 갖는 $Nb_3$Sn 케이블 접합부의 직류 저항 특성
이호진,김기백,연제욱,홍계원,김기만 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.2
The joints with multi-interfaces was expected to have low DC resistance compared with those with single interface. The small size joint specimens joined with Nb3Sn sub-cables were fabricated to investi-gate the DC performance in the range of 0 to 600A transport current without external magnetic field. The joints with multi-interfaces have a few n-Ohm resistance, which is much lower than that of single lap joint. Because the interfaces between sub-cables of multi-interfaced joint are more complicated than those of single-interfaced joint, the soldering condition between sub-cables is very effective on the joint DC resistance.
이호진,이금원,Lee, Ho-Jin,Lee, Keum-Won 한국융합신호처리학회 2007 융합신호처리학회 논문지 (JISPS) Vol.8 No.3
본 논문에서는 비선형시스템의 제어대상의 하나로 사용되고 있는 Chua회로를 대상으로 견실 출력귀환제어를 실현한다. 특히 비선형인 경우는 선형의 경우와 틀린 접근방법을 사용하여야 한다. 우선 기준신호발생기인 exosystem을 정의하고 출력추종오차식으로부터 오차방정식을 유도하고, 적분기 형태의 서보보상기를 사용하여 수정된 슬라이딩면을 설계한다. 수정된 슬라이딩면과 서보보상기에 사용되는 파라미터들은 슬라이딩면 및 서보보상기가 안정하도록 관련다항식이 Hurwitz조건을 만족하도록 정한다. 특히 모든 파라미터들이 미지여서, 오차신호들이 귀환으로부터 얻을 수 없기 때문에, 고이득 관측기를 설계하고, 이 추정값을 사용하여 안정화제어기를 얻는다. 시뮬레이션결과를 제시함으로서 알고리즘이 유용함을 증명한다. This paper deals with the robust nonlinear controller design using output feedback for a Chua circuit which is one of the well-known nonlinear models. First, an exosystem for reference signal tracking is defined, and error dynamic equations are derived from the differentiation of the output tracking error equation. The normal sliding surface is modified using the integral type servo compensator. The parameters in the equations of the modified sliding surface and servo compensator are determined by using the Hurwitz condition of stability. Especially the error signals can't be obtained directly from the output because all parameters are assumed unknown. So instead, a high gain observer is designed. From this estimated error signals, a stabilizing controller is designed. Simulation is done for demonstrating the effectiveness of the suggested algorithm.
이호진,이금원,Lee, Ho-Jin,Lee, Keum-Won 한국융합신호처리학회 2008 융합신호처리학회 논문지 (JISPS) Vol.9 No.2
In this paper, a simplified type of adaptive controller using Nussbaum gain for the control of the spacecrapt with elastic appendages is suggested. This method doesn't need the information of the high frequency components in transfer function. While the pitch angle tracks the desired value by this method, the elastic modes are also stabilized. Only pitch angle and the pitch rate are used for the design of the output feedback controller. Especially all system parameters and the high frequency gain are assumed to be unknown. For design simplicity, a controller is designed by using only the linear part, and it's shown to satisfy the nonlinear system by the simulation with basic explanations. By using the Lyapunov function, the stability of the suggested algorithm is demonstrated, and also the effectiveness of the suggested algorithm is verified by showing the computer simulation results. 본 논문에서는 유연모드 부속물을 갖는 우주선의 제어를 위해서 누스범 이득을 갖는 간단한 형태의 적응제어기를 제안한다. 이 방법은 전달함수에서 고주파 이득의 정보가 필요하지 않는다. 본 논문의 방법을 사용하여 피치각도가 목표치를 추종하는 중에, 아울러 유연모드의 안정화도 이룬다. 피치각과 피치각속도 성분만 사용하여 출력궤환제어기를 설계한다. 특히 모든 시스템 파라미터 및 고주파성분은 미지로 한다. 설계의 간편성을 위해서 선형함수만을 사용하여 설계한 제어기가 전체 비선형시스템을 만족함을 시뮬레이션을 통하여 보이고, 그 근거도 설명한다. Lyapunov 함수를 구성하여 제안한 방법의 안정성을 증명하고, MATLAB을 이용한 컴퓨터 시뮬레이션 결과를 제시하여 제안한 방법의 유용성을 증명한다.