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오옥신의 종류 및 농도가 가이즈까 향나무의 삽목 발근에 미치는 영향
윤재길,송시호,박상현 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-
Effects of auxin and Rootone on the rooting of Juniperus chinensis var. Kaizuka cutting were investigated to improve propagation efficiency. When Rootone treated, rooting was 100% compared with the control, 33%. IBA 200ppm 1h and NAA 100ppm 12h improved evidently rooting, 93% and 90%, respectively. Root fresh weight increased up to 131mg by Rootone. NAA 200ppm 12h, NAA 500ppm 1h, and IBA 200ppm 1h were also very effective to root fresh weight more than 110mg. Shoot growth(height, fresh weight and dry weight) did not increase largely, but increased a little. Dipping into high concentration auxin solution for 1min increased rooting rate and root fresh weight, but was less effective than low concentration treatment. Shoot growth did not increase largely, but increased a little. These results indicate that Rootone and IBA 200ppm 1h are most effective for improvement of rooting in Juniperus chinensis var. Kaizuka cutting.
고속 인출되는 광섬유의 헬륨 냉각장치 내 공기유입에 대한 수치적 연구
김경진(Kyoungjin Kim),김동주(Dongjoo Kim),곽호상(Ho Sang Kwak),박상희(Sang Hee Park),이영섭(Yeong Seop Lee),송시호(Si Ho Song),이원선(Won Sun Lee),문대승(Dae Seung Moon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
It is essential to properly cool down the glass fiber drawn from the fused silica preform in the high speed manufacturing process of high quality optical fiber. Natural cooling of glass fiber in the quiescent air is adequate only at low speed glass fiber drawing, and the modem optical fiber manufacturing requires a dedicated cooling unit with the helium injection in order to increase the thermal conductivity of cooling gas in the cooling unit. Even though the helium is constantly injected into the cooling unit, the air is still entrained and unavoidable when the glass fiber passes through the cooling unit. Thus, it is critical to find the operating conditions to minimize the amount of the air entrainment. The present numerical study investigates the air entrainment into the cooling unit from the outer atmosphere, and the effects of helium injection rate and direction on the air entrainment rate are discussed.
광섬유 고속인출공정용 유리섬유 냉각장치 내 공기유입에 의한 내부헬륨농도 저하현상 연구
김경진(K. Kim),김동주(D. Kim),곽호상(H.S. Kwak),박상희(S.H. Park),송시호(S.H. Song) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.4
In a modern high speed drawing process of optical fibers, it is necessary to use helium as a cooling gas in a glass fiber cooling unit in order to sufficiently cool down the fast moving glass fiber Feshly drawn fiom the heated silica preform in the furnace. Since the air is entrained unavoidably when the glass fiber passes through the cooling unit, the helium is needed to be injected constantly into the cooling unit. The present numerical study investigates and analyzes the air entrainment using an axisymmetric geomeliy of glass fiber cooling unit. The effects of helium injection rate and direction on the air entrainment rate are discussed in terms of helium purity of cooling gas inside the cooling unit. For a given rate of helium hijection, it is found that there exists a certain drawing speed that results in sudden increase in the air entrainment rate, which leadl' to the decreasing helium purity and therefore the cooling performance of the glass fiber cooling unit. Also, the helium injection in aiding direction is found to be more advantageous than the hijection in opposing direction.