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베트남 호치민에서의 셀레늄상황과 셀레늄영지 버섯의 시범재배 과정과 성과분석
김종혁,서규선,장현유,장광진,이관호,송천영,Kim, J.H.,Suh, G.S.,Chang, H.Y.,Chang, K.J.,Lee, K.H.,Song, C.Y. 국립한국농수산대학교 교육개발센터 2007 현장농업연구지 = Journal of practical agricultural resear Vol.9 No.1
This study was carried to analyze the demonstrational cultivation process of selenium supplemented P. linteus and G. lucidum from 2005 to 2006 and ifs effect at Hochimin Agricultural Technology College(HATC) in Vietnam, according to the mutual contract between the Yunjung-nongwon, a fanning company in Korea and HATC. As a result of the demonstrational cultivation of selenium supplemented P. linteus and G. lucidum, the external aspect, such as size, thickness and color of the P. linteus and G. lucidum were very much high qualified comparing to the same strain P. linteus and G. lucidum generally cultivated in Korea. The major contribution factors to this high qualified mushroom product could be drawn as followings; keeping growing condition of the mushroom with precise data collection of Vietnam climate and weather, involvement of the various professors of Korea National Agricultural College(KNAC), maintenance of bio-technical security through the strain cultivation on the oak log in Korea, the Yunjung-nongwon manager's endeavor being consulted by the various professors of KNAC even to be a student of the agricultural chief executive officer(CEO) training course in KNAC and the HATC's constant cooperation to the mushroom demonstrational cultivation instead of the orchid which was originally contracted item.
고속 밀링 가공 시 주축 변위 측정을 통한 절삭력의 실시간 감시
김종혁(J. H. Kim),김진현(J. H. Kim),김일해(I. H Kim),안형준(H. J. Ahn),장동영(D. Y. Jang),한동철(D. C. Han) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
A cylindrical capacitive displacement sensor (CCS) was developed and applied for monitoring end milling processes. Dynamic characteristics of a spindle-assembly were measured using the CCS and a designed magnetic exciter. The technique to extract the spindle displacement component caused only by cutting from the measured signals using the CCS was proposed in the paper. Using CCS signals and FRF (Frequency Response Function) derived from dynamics of the spindle tool system, dynamic cutting forces are estimated quantitatively.
가변 용적형 사판식 피스톤 펌프의 회전 속도 조절에 의한 정압 제어 소비 동력 절감
김종혁(J. H. Kim),홍예선(Y. S. Hong) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.4
This paper proposes a control scheme to reduce the power consumption of a variable displacement swash-plate type piston pump supplying oil to a valve-controlled hydraulic cylinder at constant pressure. Whenever flow rate demand was absent, the swash plate angle and the pump speed were changed to the minimum values required to compensate for the internal leakage flow. In response to command signals, the pump speed was changed in proportion to the absolute mean value of the speed component for position commands. At the same time, a pressure regulator was activated to maintain constant system pressure by precisely adjusting the pump speed with the swash plate angle fixed at the maximum. The conventional system consisting of a pressure-compensated variable displacement type pump is driven at a constant speed of 1,800rpm. By comparison, computer simulation and experimental results showed that idling power at stand-by status could be reduced by up to 70% by reducing the pump speed from 1,800rpm to 300rpm and the swash plate angle to the minimum.
가변 용적형 사판식 피스톤 펌프의 정압 제어 소비 동력 절감
김종혁(J. H. Kim),홍예선(Y. S. Hong) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
In this paper a control scheme was proposed to reduce the power consumption of a variable displacement swash-plate type piston pump which supplies oil to a valve-controlled hydraulic cylinder at a constant pressure. Whenever the flow rate demand is absent, the swash plate angle and the pump speed were changed to minimum values only required for compensating the internal leakage flow. In response to command signals, the pump speed was changed in proportion to the absolute mean value of the speed component of position commands. At the same time, a pressure regulator was activated to maintain the system pressure constant by precisely adjusting the pump speed. Computer simulation and experimental results showed that the idling power at the stand-by status could be reduced by up to 70% by reducing the pump speed from 1,800rpm to 300rpm and the swash plate angle to the minimum, compared to the conventional system consisting of a pressure-compensated variable displacement type pump driven at a constant speed of 1,800rpm.