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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.
유압 부품의 데미지 분석을 통한 마모수명예측 방법에 관한 연구
김성훈(S.H. Kim),홍예선(Y.S. Hong),김종혁(C.H. Kim) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
Construction machinery companies are increasing the required life to improve product competitiveness. Accordingly, hydraulic component companies are also conducting many studies to improve the product life and reliability. However, studies on the wear life prediction method are very insufficient, while fatigue life can be predicted relatively easily based on the S-N curve of the material. Therefore, this paper defined the damage analysis method using PV-T map for each material pair based on the fatigue damage analysis method. In addition, the defined wear damage analysis method was verified by analyzing the wear life of the actual sample CUP data. In the future, it is expected that the reliability of products can be enhanced through the analysis of wear damage analysis to strengthen the competitiveness of products.
네트워크를 이용한 자동 Ⅳ 주사 유량 제어 및 모니터링
김진남(J. N. Kim),권원태(W. T. Kwon),김용선(Y. S. Kim),김종혁(J. H. Kim),리춘미(C. M. Lee),이성규(S. K. Lee),박승환(S. H. Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Ⅳ injection is the giving of substances directly into a vein and is widely used in hospitals. This passive method does not control the flow rate consistently. As a result, it causes an unnecessary nurse's overwork and decrement of Ⅳ injection's effect. To solve these problems, the flow control infusion pump has been developed. But because of relatively heavy weight and high price, it has not been used widely, yet. In this study, automatic Ⅳ injection system with small pressing mechanism and efficient control system is designed and fabricated. The system is smaller in size and uses lower power than the existing commercial product. Presented system is also equipped with networking capability, which enables monitoring the status of several automatic IV injection system.
EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선
홍예선(Y. S. HONG),권용철(Y. C. Kwon),김종혁(C. H. Kim),이성렬(S. L. LEE),김병곤(B. K. Kim),문진삼(J. S. Moon),김재환(J. H. Kim) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for the position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as the wear rate of sliding components, such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were engendered by a frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons along with its effects were demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.
EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선
홍예선(Y.S. HONG),권용철(Y.C. Kwon),김종혁(C.H. Kim),이성렬(S.L. Lee),김재환(J.H. Kim),김병곤(B.G. Kim),문진삼(J.S. Moon) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.4
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as wear rate of sliding components such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were brought about by frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons, and its effects was demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.
서중산 ( J. S. Suh ),이관섭 ( K. S. Lee ),장기택 ( K. T. Jang ),한태호 ( T. H. Hahn ),백광호 ( G. H. Baik ),백일현 ( I. H. Baek ),박현주 ( H. J. Park ),박상훈 ( S. H. Park ),김종혁 ( J. H. Kim ),박충기 ( C. K. Park ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
〈목적〉 충수돌기의 게실은 발병율이 0.004-2.1%로 알려져 있으며 이러한 충수돌기의 게실에 생기는 게실염은 더 드문 것으로 보고되고 있다. 그러나 최근 급성복증환자에서 복부초음파로 대부분의 충수돌기 게실염 환자에서 수술전 진단이 가능해 졌고 이로 인한 진단예가 증가하고 있다. 이에 저자들은 충수돌기 게실염에서 복부초음파의 소견과 충수돌기 게실염환자들의 특성을 조사하였다. 〈방법〉 2000년 3월부터 2001년 6월까지 진단되어 수술하였던 13예에서