• 한국작물학회지
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• 제42권6호
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• pp.693-698
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• 1997

1. 삼투 potential($\Psi_\pi$=-10 bar)이 같은 P.E.G.와 NaCl 용액을 사용하여 유묘의 한해와 염해를 비교한 결과 초장, 유묘건물중, 엽록소 함량 그리고 엽수분 potential의 감소와 유리 proline 함량의 증가는 NaCl 처리보다는 P.E.G. 처리구에서 더 심하였다. 2. 유리 아미노산은 무처리(호그랜드 용액)보다 한해유발처리(P.E.G.)에서 2.6배 그리고 염해유발처리(NaCl)에서 3.6배 증가하였으나 유리 proline은 전 아미노산 함량 중 한해과 염해에서 각각 66%와 61%를 차지하였다. 3. P.E.G. 처리구에서는 phenylalanine이 그리고 NaCl 처리에서는 phenylalanine, alanine 및 asparagine이 현저히 증가한 경향이었다. 4. 보리 유묘기의 한해와 염해반응은 전반적으로 볼 때 비교적 동질적이고 유사한 경향이었다.

• 펄프종이기술
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• 제44권4호
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• pp.77-84
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• 2012

The lithographic process depends on a satisfactory ink-in-water emulsion being formed during printing and the speed of wet presses makes the choice of fountain solution vitally important as the ink and fount must react quickly to form a stable emulsion. Ink and water come into contact with each other on the rolls of the press and are forced together in the roll nips. The water is not soluble in the ink since it is slightly fat. Instead, an emulsion is formed, a heterogeneous mass consisting of small water drops mixed into the ink, if the water feed is too great. This emulsification can affect the properties of an off-set ink and negatively affect the printability. So we investigated the effects of the emulsification of phenol free heat-set ink and existing heat-set ink on printed quality, such as amount of ink transfer, printed density, print-through and uniformity. We used Duke emulsification tester for the emulsification of inks, and used IGT printability tester for printed quality. The printed quality were measured by densitometer and were evaluated by the image analysis system. Compared to conventional printing ink, phenol-free ink showed better results of the printability at the emulsification.

• 한국잠사곤충학회지
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• 제33권2호
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• pp.100-102
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• 1991

제사공정의 부잠사 처리폐수에 대하여 그 성상과 추출 유지성분을 분석한 결과 1. 부잠폐수의 COD 605mgO/$\ell$ 총 용존 고형물량 2,335mg/$\ell$ 총 부유 고형물량 2,234mg/$\ell$이었다. 2. 부잠폐수의 지질에는 triglyceride가 76.8%로 가장 많이 함유되었으며 유리 지방산 12.5%와 diglyceride 5.7% free sterol 5.0% 순이었다. 3. 부잠폐수지질의 지방산 조성은 oleic acid, linolenic acid와 linoleic acid의 함유율이 64.93%로 가장 많이 함유되어 있고 palmitic acid 29.39% stearic acid 4.93%의 순이었다.

• International Journal of Ocean System Engineering
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• 제2권1호
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• pp.32-36
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• 2012

This paper presents a comparison of potential and viscous computational codes for the water entry problem. A po-tential code was developed which adopted the boundary element method to solve the problem. A nonlinear free surface boundary condition was integrated to find new locations of free surface. The dynamic boundary condition was simplified by taking constant potential values for every time steps. The simplified dynamic boundary condition was applied in the new position of the free surface not at the mean level, which is the usual practice for linearized theory. The commercial code FLUENT was used to solve the water entry problem from the viscosity point of view. The movement of the air-liquid interface is traced by distribution of the volume fraction of water in a computational cell. The pressure coefficients were compared with each other, while experimental results published by other researchers were also examined. The characteristics of each method were discussed to clarify merits and limitations when they were applied to the water entry problems.

• 한국해양공학회지
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• 제14권3호
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• pp.35-40
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• 2000

SMAC method is, one of the numerical simulation techniques, modified from the original MAC for the time-dependent variation of fluid flows. The Navier-Stokes equation for incompressible time-dependent viscous flow is applied and, also marker particles which move with the fluid are used. Two-dimensional numerical computations of fluid flow are carried out in a virtual water tank. This paper has shown very well the movements of marker particles using SMAC method.

• 대한본초학회지
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• 제24권1호
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• pp.15-21
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• 2009

Objectives : This study was designed to investigate the effect of water extract from Paeonia Lactiflora Pasll. with medicinal herb on plasma lipid and glucose in rats fed high fat diet. Methods : Experimental groups were divided into control diet group(C), high fat diet group(HF), high fat diet and 5% water extracts from Paeonia Lactiflora Pasll. with medicinal herb group(HFE I), high fat diet and 10% water extract from Paeonia Lactiflora Pasll. with medicinal herb group(HFE II). Weight gain, food intake, food efficiency, plasma lipid concentration and glucose were determined for 10 weeks during high fat diet. Results : In this experiment, body weight and food efficiency were significantly increase in high fat diet. High fat diet group showed elevated levels of total cholesterol, LDL-cholesterol and free fatty acid. Consumption of 10% water extract Paeonia Lactiflora Pasll. with medicinal herb lowers level of total cholesterol, LDL-cholesterol and free fatty acid. But levels of plasma triglyceride, HDL-cholesterol and glucose did not affect by high fat diet and water extract Paeonia Lactiflora Pasll. with medicinal herb Conclusions : In these results, water extract Paeonia Lactiflora Pasll. with medicinal herb in high fat diet group decreased plasma total cholesterol, LDL-cholesterol and free fatty acid. Thus the Paeonia Lactiflora Pasll. with medicinal herb might be useful in the treatment of hyperlipemia.

• 대한의용생체공학회:의공학회지
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• 제20권2호
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• pp.231-236
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• 1999

Q-switch된 Er:YAG 레이저를 이용해서 치아표면에 뿜어준 외부의 물로 인해 유도된 열 및 역학적인 효과를 이해하는 것은 free-running Er:YAG 레이저에 의한 절삭효과를 이해하는데 대단히 중요하다. 이는 (파장 하나의 길이가 250 $\mu\textrm{s}$인) free-running 레이저에 의한 한 거 대효과가 본 실험에서 이용한 (파장 하나의 길이가 1 $\mu\textrm{s}$인) Q-switch된 레이저에 의한 미소효과들의 축적이기 때문이다. 치아표면에 물이 있을 때 Q-Switch된 레이저에 의한 절삭률은 그렇치 않은 때에 비해 증가되었다. 치아표면에 물을 뿜어주는 횟수는 절삭률에 영향을 미쳐서 저에너지에서는 더디게 물을 뿜어줄때 놀은 절삭률을 얻었다. 반동압력의 세기는 치아표면 조건에 의존하는데. 표면이 젖을수록 그리고 뿜어준 물의 양이 증가 할 수록, 반동압력의 세기 또한 증가하였다. 이 연구로부터 우리는 1-$\mu\textrm{s}$-길이의 pulsed 레이저에 의해 유도된 열 및 역학적인 효과가 외부에 물이 있을 때 free-running Er:YAG 레이저에 의한 절삭을 이해하는데 중요한 정보를 제공해 준다는 것을 알았다.

• 한국해양공학회지
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• 제25권4호
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• pp.23-27
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• 2011

This experimental study was performed to find rpms of the impeller and the surface flow accelerator to make a uniform velocity vertical distribution in the circular water channel. PIV technique was employed to measure the water velocity profiles into the water depth from the free surface. The number of instantaneous velocity profiles was decomposed into mean and turbulence velocity components, and the distribution of velocity fluctuation and turbulence intensity were computed for each experimental condition. From these results, the velocity uniformity was quantitatively determined to present the flow quality in the measuring section of the circular water channel. It has been shown that the proper operation of the surface flow accelerator would make the uniform velocity profiles and reduce the velocity fluctuation near the free surface.

• Clinical and Experimental Pediatrics
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• 제50권5호
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• pp.430-435
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• 2007

Even though we drink and excrete water without recognition, the amount and the composition of body fluid remain constant everyday. Maintenance of a normal osmolality is under the control of water balance which is regulated by vasopressin despite sodium concentration is the dominant determinant of plasma osmolality. The increased plasma osmolality (hypernatremia) can be normalized by the concentration of urine, which is the other way of gaining free water than drinking water, while the low plasma osmolality (hyponatremia) can be normalized by the dilution of urine which is the only regulated way of free water excretion. On the other hand, volume status depends on the control of sodium balance which is regulated mainly by renin-angiotensin-aldosterone system, through which volume depletion can be restored by enhancing sodium retention and concomitant water reabsorption. This review focuses on the urine concentration and dilution mechanism mediated by vasopressin and the associated disorders; diabetes insipidus and syndrome of inappropriate antidiuretic hormone secretion.

• Journal of Ginseng Research
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• 제5권2호
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• pp.122-131
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• 1981

An aqueous extract s of fresh ginseng roots was heated at loot for 64 hrs. and the changes of color intensity, pH and the amount of free sugars and amino acids during the various intervals of the heating time were investigated. Color intensity and absorbance of the solution at 490nm were increased in proportion to the length of the heating time. Most of brown pigments produced during the treatment were water soluble, and pH 5.1 at initial stage of the solution, was slightly decreased at the final stages of the reaction. Sucrose, glucose and fructose were major free sugars in ginseng roots, and the amounts of sucrose was over 90 % of total free sugars. Sucrose. was largely decreased approximately 50%, by 64 hrs of the treatment, whereas sharp increase in the amount of glucose and fructose was observed during the reaction in the solution. The observed increase in reducing sugars, glucose and fructose was presumed due to hydrolysis of sucrose. Evidently, glucose and fructose were not important factor to control the browning reaction of the solution. Most of free amino acids and peptides except alanine and isoleucine especially arginine, serine and threonine, were sharply decreased up to 40 : 50% of the original concentration within 2 hrs. Accordingly, the content of free amino acids and peptides seems to be extremely important factor to control the browning reaction in ginseng. A free amino acid, presumed to be nor-leucine, was found in fresh ginseng root on the basis of re mention on liquid chromatography. Kinetic analysis of the browning reaction indicated a pseudo second order with respect to amino acid concentration at the initial stage.