• 대한한방내과학회지
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• 제18권1호
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• pp.69-85
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• 1997

This study was designed to elucidate the anti-inflammatory, cardiovascular, anti-thrombotic and analgesic effects of Shintongchugeotang. The anti-inflammatory effect was measured by the method of carragenin induced edema, protein leakage test using CMC-pouch, and the analgesic effect was measured by the acetic acid method and hot plate method, and the effect of Shintongchugeotang on the cardiovascular system was observed by the change of flow rate of Ringer solution in the vascular system in the ear of rabbit, and the contraction and dilatation of rat tail artery. Death rate, platelet aggregation, plasma coagulation activity was observed for the measurement of the anti-coagurative effect of Shintongchugeotang. The result was as follows : 1. After the administration of Shintongchugeotang extract, Carragenin induced edema and CMC-pouch protein leakage were significantly decreased. 2. The slight analgesic effect of Shintongchugeotang extract was confirmed by the observation of writhing syndrome, paw licking time, and escape time. 3. The drug increased the auricular blood flow in rabbit. 4. The drug relaxed the artery contraction by pretreated norepinephrine in rat. 5. The drug inhibited the death rate of mouse which was led to thromboembolism by serotonin and collagen. 6. The drug inhibited the platelet aggregation in rat. 7. The drug prolonged the prothrombin time and activated partial thromboplastin time on the test of plasma coagulation factor activity in rat, but was not valuable.

• 조명전기설비학회논문지
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• 제24권2호
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• pp.101-105
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• 2010

본 논문은 수열합성법에 의해 합성된 ZnO 나노와이어의 전계방출 특성을 연구하였다. ZnO 나노와이어는 핫플레이트 위에서 90[$^{\circ}C$]의 온도로 Au 박막위에서 합성되었으며, ZnO 나노와이어의 팁을 형성하기 위한 캡핑 재료로 SDS(Sodium Dodecyl Sulfate)를 0.05~0.3[wt%] 용액에 혼합하였다. 2시간동안 수열합성후 체인 형태의 ZnO 나노와이어가 성장되었다. 고순도의 ZnO 나노와이어는 울자이트(Wurzite) 구조의 팁 형태를 보였으며, ZnO 나노와이어의 전계방출 특성은 고진공 챔버에서 측정하였고, 나노와이어의 턴-온 전계는 0.1[${\mu}A/cm^2$]의 전류밀도에서 4.1V/${\mu}m$]를 나타내었다.

• 대한한방내과학회지
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• 제19권2호
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• pp.88-106
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• 1998

This study was designed to elucidate the antiinflammatory, cardiovascular, antithrombotic, and analgesic effect of Sambitang. The antiinflammatory effects was measured by the method of carrageenin induced edema, protein leakage test using CMC-pouch, and the effect of Sambitang on the cardiovascular system was observed by the change of flow rate of Ringer solution in the vascular system in the ear of rabbit, and the contraction and dilatation of rat tail artery. Death rate, platelet aggregation, plasma coagulation activity was observed for the measurement of the anticoagurative effect of Sambitang, and the analgesic effect was measured by the acetic acid method and hot plate method. The result was as follows: 1. Sambitang administration, edema and protein leakage was significantly decreased. 2. The drug increased the auricular blood flow in rabbit. 3. The drug relaxed the artery contraction by pretreated norepinephrine in rat. 4. The drug inhibited the death rate of mouse which was led to thromboembo- lism by serotonin and collagen. 5. The drug inhibited the platelet aggregation in rat. 6. The drug prolonged the prothrombin time and activated partial thromboplastin time on the test of plasma coagulation factor activity in rat, but was not valuable. 7. The slight anagesic effect of Sambitang extract was confirmed by the observation of writhing syndrome, paw licking time, and escape time.

• 한국식생활문화학회지
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• 제4권1호
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• pp.103-108
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• 1989

본 연구에서는 7% 소금 용액을 이용하여 예비 열처리($60^{\circ}C$, 1시간), pH8.5로의 예비 열처리, 염화칼슘 첨가 및 microwave를 이용한 후열처리가 오이지 침지 용액의 pH, 산도, AIS내의 총 펙틴 함량, HWSP 함량, 견고도에 미치는 영향에 대해 살펴보았다. 제조 0, 5, 10, 15, 25일째의 분석을 통해 pH는 감소, 산도는 높아지는 경향을 보였으며 최종 분석일의 pH는 예비 열처리, 염화칼슘 첨가 및 microwave 후열처리군이 가장 높은 3.1, 산도는 1.93%로 가장 낮은 수치를 보였다. AIS에 존재하는 총 펙틴 함량은 시간이 지남에 따라 감소하는 경향을 보였으며 대조군에 비해 처리군들의 감소율은 적었으며 예비 열처리, 염화칼슘 첨가 및 microwave 후열처리군의 최종 함량은 가장 높은 17.93%로 나타났다. HWSP의 함량은 제조 후 5일째부터 15일째까지는 증가하다가 그 이후에는 급격히 감소했다. Texturometer에 의한 견고도 측정결과 제조 후 15일째부터는 실험군들간에 차이가 많이 나기 시작했으며 최종 견고도는 대조군이 가장 낮은 4.77kg, 예비 열처리, 염화칼슘 첨가 및 microwave 후열처리군이 가장 높은 6.88kg로 나타났다. 연구결과로 보아 총 펙틴 함량과 견고도와는 서로 연관이 깊은 것으로 보이며 microwave 후열처리는 펙틴물질의 분해를 저지시켜 견고도가 감소되는 정도를 낮게 해 줄 수 있는 방법이 될 수 있다고 생각한다.

• 한국토양비료학회지
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• 제44권5호
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• pp.727-733
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• 2011

A new Korean standard for the determination of Cr(VI) in soils has been officially published as ES 07408.1 in 2009. This analytical method is based on the hot alkaline digestion and colorimetric detection prescribed by U.S. EPA method 3060A and 7196A. The hot alkaline digestion accomplished using 0.28 M $Na_2CO_3$ and 0.5 M NaOH solution (pH 13.4) at $90{\sim}95^{\circ}C$ determines total Cr(VI) in soils extracting all forms of Cr(VI), including water-soluble, adsorbed, precipitated, and mineral-bound chromates. This aggressive alkaline digestion, however, proved to be problematic for certain soils which contain large amounts of soluble humic substances or active manganese oxides. Cr(III) could be oxidized to Cr(VI) by manganese oxides during the strong alkaline extraction, resulting in overestimation (positive error) of Cr(VI). In contrast, Cr(VI) reduction by dissolved humic matter or Fe(II) could occur during the neutralization and acidic colorimetric detection procedure, resulting in underestimation (negative error) of Cr(VI). Futhermore, dissolved humic matter hampered the colorimetric detection of Cr(VI) using UV/Vis spectrophotometer due to the strong coloration of the filtrate, resulting in overestimation (positive error) of Cr(VI). Without understanding the mechanisms of Cr(VI) and Cr(III) transformation during the analysis it could be difficult to operate the experiment in laboratory and to evaluate the Cr(VI) results. For this reason, in this paper we described the theoretical principles and limitations of Cr(VI) analysis and provided useful guidelines for laboratory work and Cr(VI) data analysis.

• 한국작물학회지
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• 제51권spc1호
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• pp.198-203
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• 2006

고구마 고품질 분말 제조 방법을 확립키 위하여 건조방법에 따라 건조시간과 제분을, 분말의 색택 등 조사하고, 제조과정 중 색깔의 변화를 방지 할 수 있는 갈변방지제 선정 실험을 수행한 결과를 요약하면 다음과 같다. 1. 건조시간은 $50^{\circ}C$는 $3.7{\sim}4.1$ 시간으로 $70^{\circ}C$에 비하여 $1.7{\sim}2.2$배, $90^{\circ}C$에 비하여 $2.7{\sim}2.8$배가 길었다. 2. 비타민의 함량은, 생 고구마에 비하여 열풍건조 분말이 $2{\sim}22%$ 정도이었고, 동결건조는 $62{\sim}67%$로 높았다. 열풍 건조의 경우 건조 온도별로는 $70^{\circ}C$가 원료고구마에 비하여 $12{\sim}22%$로 손실량이 가장 적었다. 3. 당도는 생 고구마에 비하여 약 $40{\sim}50%$ 정도이었고, 건조온도 중에서는 $70^{\circ}C$가 다소 높은 경향이었다. 4. 건조온도별 제분율은 $70^{\circ}C$가 높았고, 품종 중에서는 진홍미가 높았다. 5. 건물을, 건조시간, 성분변화, 제분을 등을 종합적으로 고려하여볼 때 적정 건조 온도는 열풍건조 $70^{\circ}C$가 좋았다. 6. 분말조제시 적정절단 두께는 비타민 C함량과 기호도 등을 고려하여 볼 때 슬라이스 2.0 mm가 가장 좋은 것으로 판단된다. 7. 고구마 분말 제조시 갈변방지를 위하여 비타민 C 1% 용액에 침지하는 것이 가장 좋았다.

• 한국재료학회지
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• 제12권10호
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• pp.784-790
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• 2002

For mass product of nanocrystalline ZnO ultrafine powders, self-sustaining combustion process(SCP) and ultrasonic spray combustion method(USCM) were applied at the same time. Ultrasonic spray gun was attached on top of the vertical type furnace. The droplet was sprayed into reaction zone of the furnace to form SCP which produces spherical shape with soft agglomerate crystalline ZnO particles. To characterize formed particles, fuel and oxidizing agent for SCP were used glycine and zinc nitrate or zinc hydroxide. Respectively, with changing combustion temperature and mixture ratio of oxidizing agent and fuel, the best ultrasonic spray conditions were obtained. To observe ultrasonic spray effect, two types of powder synthesis processes were compared. One was directly sprayed into furnace from the precursor solution (Type A), the other directly was heated on the hot plate without using spray gun (Type B). Powder obtained by type A was porous sponge shape with heavy agglomeration, but powder obtained using type B was finer primary particle size, spherical shape with weak agglomeration and bigger value of specific surface area. 9/ This can be due to much lower reaction temperature of type B at ignition time than type A. Synthesized nanocrystalline ZnO powders at the best ultrasonic spray conditions have primary particle size in range 20~30nm and specific surface area is about 20m$^2$/g.

• Journal of Advanced Marine Engineering and Technology
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• 제29권5호
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• pp.495-501
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• 2005

Al is a active metal that owes its resistance to a thin, protective, barrier oxide surface layer, which is stable in air and neutral aqueous solution. Thus Al alloys are widely used in architectural trim. cold & hot-water storage vessels and piping. However Al and most of its alloy may corrode with some forms such as pitting corrosion, intergranular corrosion and galvanic corrosion in the case of exposure to various industrial and marine atmosphere. Therefore a correct evaluation of corrosion resistance for their Al and Al alloys may be more important in a economical point of view. In this study. a relative evaluation of corrosion resistance for three kinds of Al alloys such as ALDC2, ALDC3, and ALDC8 series was carried out with electrochemical method. There is a tendency that corrosion potential is shifted to positive or negative direction by alloying components regardless of corrosion resistance. Moreover the data of corrosion properties obtained from cathodic Polarization curve, cyclic voltammogram and AC. DC impedance respectively showed a good correspondence each other against the corrosion resistance but variation of corrosion potential. passivity current density of anodic polarization curve and corrosion current density by Tafel extrapolation and Stern-Geary method didn't correspond with not only each other but also considerably the data of corrosion properties discussed above. Therefore it is suggested that an optimum electrochemical evaluation for corrosion resistance of Al alloy is to calculate the diffusion limiting current density of cathodic polarization curve, impedance of AC or DC and polarization resistance of cyclic voltammogram.

• 대한기계학회논문집B
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• 제34권8호
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• pp.739-747
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• 2010

고온의 내부 원형 실린더가 존재하는 저온의 사각 밀폐계 사이의 온도차이에 의해 발생하는 자연대류에 관해 수치해석을 수행하였다. 본 연구는 내부의 원형 실린더를 표현하기 위해 유한 체적법에 기초한 가상 경계법을 사용하여 Ra = $10^7$ 에서 2 차원 비정상상태의 자연대류 현상에 대한 해를 얻었다. 더욱이 밀폐계의 수직 중심선에 따른 내부 원형 실린더의 위치 변화에 의한 열전달과 유동에 관한 영향을 연구하였다. 내부원형 실린더의 위치 변화에 따라 자연대류 현상은 비정상상태에서 정상상태로 변화 되었다. 연구 결과 두가지의 임계 위치를 얻을 수 있었다. 하부 경계는 0.05 인 지점이고 상부경계는 0.18 인 지점이다. 하부 경계와 상부 경계의 사이의 위치에서는 열 및 유동장이 정상상태임을 알 수 있었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제15권6호
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• pp.29-36
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• 2010

Several mines including Namil, Solim and Jungbong which are located in the Gyeonggi and Kangwon province have been abandoned and closed since 1980 due to "The promotion policy of mining industry". An enormous amount of mining wastes was disposed without proper treatment, which caused soil pollution in tailing dam and ore-dressing plant areas. However, any quantitative assessment was not performed about soil and water pollution by transporting mining wastes such as acid mine drainage, mine tailing, and rocky waste. In this research, heavy metals in mining wastes were analyzed according to leaching method which used 0.1 N HCl and total solution method which used Aqua-regia to recognize the ecological effect of distance from hot spot. We sampled tailings, rocky wastes and soils around the abandoned mine. Chemical and physical parameters such as pH, electrical conductivity (EC), total organic carbon (TOC), soil texture and heavy metal concentration were analyzed. The range of soil's pH is between 4.3 and 6.4 in the tailing dam and oredressing plant area due to mining activity. Total concentrations of As, Cu, and Pb in soil near ore dressing plant area are 250.9, 249.3 and 117.2 mg/kg respectively, which are higher than any other ones near tailing dam area. Arsenic concentration in tailing dams is 31.0 mg/kg, which is also considered as heavily polluted condition comparing with the remediation required level(RRL) in "Soil environment conservation Act".