• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.6
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• pp.1097-1101
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• 2002

This study was conducted to investigate the efficacy of antioxidant ability and nitrite scavenging ability of Poria cocos Poria cocos mycelium and Poria cocos fermented with rice were extracted with water and ethanol for measurement of degree of fat acidification against fish oil. Lower TBARS values of Poria cocos mycelium and Poria cocos fermented with rice were shown compared with control. Iron chelating ability of Poria cocos mycelium against Fe$^{2+}$, Cu$^{2+}$ was higher than Poria cocos fermented with rice. Electron donating abilitv of water extract and ethanol extract of Poria cocos mycelium were 76.8% and 79.9%, respectively. Higher nitrite scavenging ability was shown at ethanol extract than water extract of Poria cocos mycelium.ium.

• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.1
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• pp.60-66
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• 1997

The characteristics and stability of pigments produced by Monascus anka in a jar fermenter were examined The pigments produced by the mold were fractionated into four pigments, i.e., extracellular red pigment(ERP) extracellular yellow Pigment(EYP), intracellular red pigment(IRP) and intracellular yellow pigment(IYP) by the solvent fractionation method. These pigments showed characteristic absorption spectrum indicating that they were composed of different components of pigments. Each of these four pigments separated from Monascus anka were stable under ultraviolet light, fluorescent light and in dark conditions, but their color was faded rapidly under sun light. They were also very stable against temperature below 8$0^{\circ}C$, above which temperature the stability of the Pigments was decreased rapidly. Among the eight organic acids tested, tartaric and citric acids were found to be detrimental against the Monascus anka Pigments. And Cu$^{2+}$ ion showed the most deleterious effect on the color change of the pigments.s.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.380-386
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• 2020

The ESS load test device (ELTD) can store and exchange electrical energy during the load test of an emergency generator. On the other hand, it is difficult to commercialize ELTDs based on Li-ion batteries because of the high initial cost, which is higher than a load bank test. If the trade of electrical energy stored in ELTD during the test of an emergency generator is considered, it may be possible to commercialize the ELTD. Therefore, this paper proposes an economic model of ELTD composed of the costs and benefits by considering electrical energy trade to perform accurately economic evaluations of an ELTD. From the simulation results of the economic evaluations of an ELTD and the load bank method, it was found that the commercialization of ELTD is possible when the trade in electrical energy in ELTDs is considered.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.8
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• pp.807-812
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• 2015

Li-ion batteries are energy sources that are widely used in applications such as notebooks, cellular phones, power tools, and vehicles. They are devices in which stored chemical energy is changed to electrical energy by electrochemical reactions. They have a high energy density, small size, and are lightweight. In particular, power tools and vehicles require high charge/discharge rates. Therefore, in this paper, we perform electrochemical simulations using a commercial finite-element analysis program to determine the high discharge-rate characteristics of Li-ion cells. In addition, by performing high discharge-rate simulations, we found that the limited discharge current was 63 A. Based on the results obtained, we investigate the behavior of Li-ion cells with a high rate of discharge.

• Korean Journal of Food Science and Technology
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• v.25 no.5
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• pp.407-410
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• 1993

Stability of the anthocyanin pigment isolated from 'Comet' radish was decreased with increase of pH from 1.0 to 8.0. The destruction rate of anthocyanin at early stage was faster at pH 1.0 than pH 2.0 and 3.0, increased with increase of storage temperature from $0^{\circ}C\;to\;40^{\circ}C$. Thus the pigment preservability at $0^{\circ}C\;and\;40^{\circ}C$ after 10 days was 92.5% and 48.1%, and the half life at $0^{\circ}C\;and\;40^{\circ}C$ was 94.9 and 12.1 days, respectively Pigment was decreased with increase of ascorbic acid content from 0.015g to 0.05g.

• Korean Journal of Food Science and Technology
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• v.17 no.3
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• pp.203-207
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• 1985

Relationship between cell surface hydrophobicity and pellicle formation was studied in a film strain isolated from stored apple wine and identified as Hansenula beijerinckii FY-5. In the media containing non-ionic surface-active agents the pellicle formation of strain FY-5 was efficiently repressed, whereas growth of the yeast was possible, and also cell surface hydrophobicity was greatly decreased by the addition of these agents. These results indicate that a pellicle formation factor, which keeps yeast cells floating on the medium surface, is necessary for the pellicle formation, and surely this factor is the hydrophobicity of the cell surface. The pellicle formation in the film strains was abundant with the increase of the cell surface hydrophobicity, whereas the non-film strains had less hydrophobicity as compared with the film strains. Ethanol, as a sole carbon source, efficiently increased hydrophobicity more than glucose, and the hydrophobicity was lowered with the rise of pH. In the experiments of time course, the hydrophobicity was increased in proportion to cell growth, and was maximum during the stationary phase.

• Transactions of the Korean Society of Automotive Engineers
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• v.23 no.2
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• pp.199-207
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• 2015

Solid materials of ammonia sources with SCR have been considered for the application of lean NOx reduction in automobile industry, to overcome complex problems of liquid urea based SCR. These solid materials produce ammonia gas directly with proper heating and can be packaged by compact size, because of high volumetric ammonia density. Among ammonium salts and metal ammine chlorides, calcium ammine chloride was focused on this paper due to low decomposition temperature. In order to make calcium ammine chloride in lab-scale, simple reactor and glove box was designed and built with ammonium gas tank, regulator, and sensors. Basic test conditions of charging ammonia gas to anhydrous calcium chloride are chosen from equilibrium vapor pressure by Van't Hoff plot based on thermodynamic properties of materials. Synthetic method of calcium ammine chloride were studied for different durations, temperatures, and pressures with proper ammonia gas charged, as a respect of ammonia gas adsorption rate(%) from simple weight calculations which were confirmed by IC. Also, lab-made calcium ammine chloride were analyzed by TGA and DSC to clarify decomposition step in the equations of chemical reaction. To understand material characteristics for lab-made calcium ammine chloride, DA, XRD and FT-IR analysis were performed with published data of literature. From analytical results, water content in lab-made calcium ammine chloride can be discovered and new test procedures of water removal were proposed.

• Applied Biological Chemistry
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• v.38 no.5
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• pp.414-421
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• 1995

In order to establish informations important to the measurement of lipoxygenase (LOX) activity, providing conditions most favorable for its action and determining factors that inhibit activity, the influence of extraction buffer, substrate, pH, storage, temperature, NaCl, $CaCl_2$, other cations and antioxidants on LOX activity, and localization of LOX in cucumber tissues were carried out. The most favored substrate for LOX was linolenic acid followed by linoleic and arachidonic acids. LOX activity in both peel and mesocarp tissue extracts was maximum at pH 5.5 and relatively stable at $40^{\circ}C\;and\;50^{\circ}C$ temperature. The condition of 0.2 M NaCl with pH 5.0 was observed to provide optimum LOX stability. The enzyme activity was reduced by addition of cations, $Mn^{2+},\;Cu^{2+}\;or\; Al^{3+}$, except $Ca^{2+}$ which stimulated activity of LOX. Butylated hydroxy anisole (BHA) and propyl gallate decreased LOX activity with increasing concentration. Cucumber peel had higher activity than other tissues, locule or mesocarp, of cucumber.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.28 no.3
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• pp.112-117
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• 2018

The metal alkoxide, CuCo-glycerate nanospheres (NSs), were successfully synthesized as Cu-Co bimetallic sulfides hierarchical multi-shelled hollow nanospheres ($CuCo_2S_4$ HMHNSs) through solvothermal synthesis. In this reaction mechanism, the solvothermal temperature and the amount of glycerol as a cosurfactant play significant role to optimize the morphology of CuCo-glycerate NSs. Furthermore, $CuCo_2S_4$ HMHNSs were obtained under optimized sulfurization reaction time of 10 h via anion exchange reaction between glycerate and sulfur ions. Finally, the structural and chemical compositions of CuCo-glycerate NSs and $CuCo_2S_4$ HMHNSs were confirmed through field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and electrochemical performances.

• Nuclear Engineering and Technology
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• v.5 no.4
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• pp.310-320
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• 1973

The sorption and fixation of cesium in dilute solutions by vermiculite saturated with Na or K were studied in order to investigate any possibibty of its use in radioactive effluent treatment. The cesium sorbed by vermiculite with the increase in pH is attributed to the increase of sorption surface as a result of the dispersion. The increased cesium sorption by Na-vermiculite is due to the different sorption rates by the different exchange sites : external surface and internal surface. It is shown that the larger amount of sorbed cesium was extracted by KCI rather than with any other extractants. It is suggested that the fixation of cesium by vermiculite occurs at the crystal edge where Cs may replace K. Domestic vermiculite is a valuable material for use in the cesium sorption and fixation, and might be useful as a good packing material outside the tank of highly radioactive liquid waste. And from these results one could suggest that the artificial alteration of the biotite to vermiculite might be occurring by treating with NaCl.