• Journal of Yeungnam Medical Science
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• 제3권1호
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• pp.41-48
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• 1986

사람의 적혈구막으로부터 Band 3를 분리정제하고 이를 liposome 내로 도입시켜 그 결과를 관찰하였다. 적혈구를 약알칼리 저장액으로 용혈시켜 막을 분리한 후, 저이온강도 용액으로 처리하여 Band 4를 추출하였다. Triton X-100 추출액에 p-chloromercuribenzoate를 가하고 sucrose density gradient ultracentrifugation후 fractionation하여 Band 3를 정제하였다. phosphatidyl L-serine과 cholesterol을 1 : 1 molar ratio로 섞고 진공회전 증발기를 사용하여 chloroform을 제거한 후 Triton X-100을 제거한 Band 3용액을 가하고 sonication함으로 liposome(reverse-phase evaporation vesicle)을 만들면서 Band 3를 도입 시켰다 Band 3의 분리정제 및 liposome에 도입되었음은 sodium dodecyl sulfate-polyacrylamide gel 전기영 동 후 coomassie brilliant blue 염색으로 확인할 수 있었다.

• 자원리싸이클링
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• 제7권3호
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• pp.17-26
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• 1998

전기화학적 매개산화 공정에서 발생하는 질산 폐액으로부터 은 및 고농도 질산을 회수하기 위한 연구를 수행하였다. 고농도 질산용액 내에 포함된 은의 회수는 전착법으로 이루어졌으며, 질산농도 3M이하에서는 거의 100%의 전류효율로 98% 이상의 은을 회수할 수 있었다. 또한 질산의 회수를 위한 증발 실험이 수행되었으며, 증발률이 25에서 0.5~1.0mol%의$ NaNO_3$를 함유한 3.5M의 질산 공급폐액으로부터 질산의 절대회수율은 약 80~90%로써 2.8~3.1m의 질산을 얻을 수 있었다. 증발공정에서 회수된 묽은 질산 용액을 고농도 질산용액으로 농축하여 MEO 공정에 재사용하기 위한 처리용량 4kg/hr인 증류탑의 설계 인자 및 운전조건을 Naphtali-Sandholm의 MEH 모델을 사용하여 계산하였다. 단 효율이 70% 이상인 11개의 단으로 구성된 증류탑의 공급단을 6단으로 하고 환류비 0.25, 재비기 열용량 2.7㎾, 응축기 열량 0.5㎾로 운전할 경우 시간당 1.03kg의 12M 질산용액과 2.97kg의 물을 얻을수 있었다.

• Geomechanics and Engineering
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• 제23권3호
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• pp.207-215
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• 2020

This paper presents a kinematic limit analysis for passive earth pressure of rigid retaining structures considering the unsaturation of the backfill. Particular emphasis in the current work is focused on the effects of the spatial change in the degree of saturation on the passive earth pressure under different steady-infiltration/evaporation conditions. The incorporation of change of effective unit weight with degree of saturation is the main contribution of this study. The problem is formulated based on the log-spiral failure model rather than the linear wedge failure model, in which both the spatial variations of suction and soil effective unit weight are taken into account. Parametric studies, which cover a wide range of flow conditions, soil types and properties, wall batter, back slope angle as well as the interface friction angle, are performed to investigate the effects of these factors on the passive pressure and the corresponding shape of potential failure surfaces in the backfill. The results reveal that the flow conditions have significant effects on the suction and unit weight of the clayey backfill, and hence greatly impact the passive earth pressure of retaining structures. It is expected that present study could provide an insight into evaluation of the passive earth pressure of retaining structures with unsaturated backfills.

• 한국건축시공학회지
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• 제7권1호
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• pp.91-98
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• 2007

In this study, the property and plastic cracking pattern of concrete were compared and analyzed with the replacement ratio of fly ash 0, 5, 10, 15, 20% by cement weight. And curing conditions of concrete were given variously such as indoors(with wind speed as 0, 300, 500m/min), outdoors and chamber. The hydration temperature had a tendency to decrease as the replacement ratio of fly ash increased, and in the case of the wind speed 0m/min, it was showed that the moment that the amount of evaporation of water from surface of reference concrete was more than the volume of bleeding was 90 min since casting concrete. The time that the crack initiated had a tendency to be more quickly as the replacement ratio of fly ash increased. The number, length, width and area of crack in the indoor curing, exposed outdoor curing, enclosed outdoor curing had a tendency to decrease as the replacement ratio of fly ash increased. The crack had a tendency to decrease in sequence of exposed outdoor, enclosed outdoor curing, indoors curing. The outbreak of cracking by the change of temperature and humidity was affected by relative humidity more than temperature and the cracking had a tendency to increase as relative humidity lowered.

• 한국분무공학회지
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• 제9권2호
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• pp.34-40
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• 2004

In a liquid-fueled ramjet engine, the insufficient mixing and evaporation result in the low combustion efficiency and combustion instability. Improving its characteristics and devising a means of fuel droplets with air may compensate these disadvantages of liquid fuel ramjet engine. The jet penetrations of various fuel injectors were measured to investigate the spray characteristics of a liquid-fueled ramjet engine under high pressure air-stream conditions. The penetrations in high pressure conditions are smaller than the values calculated from Inamura's or Lee's equations, and the jet penetrations in the high pressure conditions have a similar tendency. In the dual orifice injectors, the jet penetrations of rare orifice is rapidly increased due to the reduction of the drag, which is created by the jet column of front orifice. The jet penetration of rare orifice is increased because of the drag reduction created by the jet column of the front orifice. Because of the drag reduction formed by the column of jet, the jet penetration in the rear orifice of dual orifice injector is much larger than the jet penetrations of single orifice injector. As the distances of the orifice are increased, the jet penetrations of the rear orifice decrease.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 춘계학술대회 논문집 센서 박막재료연구회 및 광주 전남지부
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• pp.86-90
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• 2008

$CuInSe_2$ thin film were prepared in order to clarify optimum conditions for growth of the thin film depending upon process, and then by changing a number of deposition conditions and heat treatment conditions variously, structural and electrical characteristics were measured. Thereby, optimum process variables were derived. For the manufacture of the $CuInSe_2$, Cu, In and Se were deposited in the named order. Among them, Cu and In were deposited by using the sputtering method in consideration of their adhesive force to the substrate, and the DC/RF power was controlled so that the composition of Cu and In might be 1:1, while the annealing temperature having an effect on the quality of the thin film was changed from $200^{\circ}C$ to $350^{\circ}C$ at intervals of $50^{\circ}C$.

• 한국조경학회지
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• 제27권1호
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• pp.122-131
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• 1999

Indoor environments are usually less than optimal for the growth of ferns, especially in regards to the water condition. These studies were performed to investigate responses involved in causing growth of ferns and presume management plan against the water deficit under indoor conditions. The effect of air humidity and soil moisture on the ferns was examined in Adiantume raddianum and Selaginella kraussiana. Results of experiments are as follows; 1. Under a low humidity condition, having a 25-50% RH. ornamental value of ferns decreased much more than under a 90% RH. Under a low soil moisture, such as sand treatment, ornamental value of ferns also decreased. 2. Leaf chlorophyll content, water content and stomata situations increased as air humidity and soil moisture went up. 3. Even if air humidity and soil water were not enough for ferns growth, the extending of irrigation cycle was helpful. 4. Under extremely low air humidity conditions, some water management, namely, using water holding soil or extending of irrigation cycle was desirable. Other methods of increasing air humidity, including water instruments such as ornamental pools, waterfalls, or fountains, grouping plants together were also helpful. But spraying water on leaves increased injury to ferns growth because of excess evaporation from the leaves. Though these studies, we learn that ferns are susceptible to water condition such as air humidity, soil water and water management. If other environmental factos are maintained with optimal conditions, water condition plays an important role in ferns growth in indoor environments.

• Transactions on Electrical and Electronic Materials
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• 제8권2호
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• pp.89-92
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• 2007

$CuInSe_2$ thin film were prepared in order to clarify optimum conditions for growth of the thin film depending upon process, and then by changing a number of deposition conditions and heat treatment conditions variously, structural and electrical characteristics were measured. Thereby, optimum process variables were derived. For the manufacture of the $CuInSe_2$, Cu, In and Se were deposited in the named order. Among them, Cu and In were deposited by using the sputtering method in consideration of their adhesive force to the substrate, and the DC/RF power was controlled so that the composition of Cu and In might be 1:1, while the annealing temperature having an effect on the quality of the thin film was changed from $200\;^{\circ}C$ to $350\;^{\circ}C$ at intervals of $50\;^{\circ}C$.

• 한국재료학회지
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• 제30권12호
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• pp.687-692
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• 2020

A zinc-air battery consists of a zinc anode, an air cathode, an electrolyte, and a separator. The active material of the positive electrode is oxygen contained in the ambient air. Therefore, zinc-air batteries have an open cell configuration. The external condition is one of the main factors for zinc-air batteries. One of the most important external conditions is temperature. To confirm the effect of temperature on the electrochemical properties of zinc-air batteries, we perform various analyses under different temperatures. Under 60 ℃ condition, the zinc-air cell shows an 84.98 % self-discharge rate. In addition, high corrosion rate and electrolyte evaporation rate are achieved at 60 ℃. Among the cells stored at various temperature conditions, the cell stored at 50 ℃ delivers the highest discharge capacity; it also shows the highest self-discharge rate (65.33 %). On the other hand, the cell stored at 30 ℃ shows only 2.28 % self-discharge rate.

• Applied Biological Chemistry
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• 제43권2호
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• pp.116-123
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• 2000

작물이 자라는 토양에서 점적 관개에 의해 일어나는 토양 수분의 분포와 이동을 3차원 직교 좌표계로 예측할 수 있는 수학적 모델을 개발하였다. 모델은 지면 증발과 증산을 고려하였으며, 이들의 계절적 현화와 하루 중의 시간변화 뿐 아니라 작물 뿌리의 성장 및 뿌리의 토양 중 분포형태도 고려하였다. 모델의 해는 block centered grid system등을 적용하여 Crank-Nicolson법과 Gauss-Seidel 반복법을 사용하여 구하였다. 모델은 실험을 통해 검증하였으며, 점적 관개의 특성을 알기 위하여 모델을 이용한 컴퓨터 모사를 실시하였고, 본 연구의 조건으로부터 다음의 결과를 얻었다. (1) 관수된 물은 점적기에서 멀어짐에 따라 그 유속이 크게 감소하였고, 관수 시간이 증가함에 따라 습윤구역의 크기가 증가하는 속도도 급격히 감소하였다. (2) 1점 관수의 경우 습윤구역은 수평 방향보다는 수직 방향으로 더 깊이까지 도달하였다. (3) 본 연구조건에서 물이용 효율은 지하 25cm지점의 4점 관수가 가장 좋았으며, 지표면 1점 관수보다 증산량은 10% 증가, 지면 증발량은 20% 감소하였다. (4) disk tension infiltrometer에 의한 토양의 수분보유도 함수는 토양수분 압출에 의한 젖음 곡선과는 상당한 차이를 나타내는 것도 알 수 있었다.