• The Korean Journal of Food And Nutrition
• /
• v.13 no.2
• /
• pp.139-145
• /
• 2000

To separate anticaries and antiinflammation from Aloe vera peel, we investigated a inhibited effect of Streptococcus mutans JC-2 that was antibiosis, glucosyltransferase activity about aloe-emodin and barbaloin. Aloe-emodin and barbaloin had strong antibiosis activity against Streptococcus mutans JC-2, they were especially antibiosis effect to low growth and prolong lag phase at attachment concentration 100$\mu\textrm{g}$/mL. The reduction rate of a culture fluid became to lessen than the comparison group for aloe-emodin and barbaloin. The intracellular materials of Streptococcus mutans JC-2 were to leakage as much as attachment concentration addition of aloe-emodin and barbaloin but there was no significant difference membrane demage between two active substances. The activity of GTase was inhibited by aloe-emodin and barbaloin and their inhibition rate was respectively 99.8%, 98.4% at the attachment concentration 100$\mu\textrm{g}$/mL.

• Journal of Nutrition and Health
• /
• v.28 no.2
• /
• pp.127-136
• /
• 1995

In this study, the nutritional composition of colostrum milk obtained from 22 mothers delivering perterm infants and 17 mothers delivering term infants was analyzed. The energy content of colostrum was yielded based on nitrogen, lactose, and lipid data. Preterm milk is more close the nutritional needs of the preterm infant than dose other breast milk. The results are as follows : 1) Protein concentration was significantly higher, but carbohydrate and lipid concentration were lower in preterm milk than fullterm milk. Energy content yielded from total nitrogen, lactose and lipid concentration was higher in the fullterm milk than preterm milk. 2) Calcium was higher in the preterm milk than fullterm colostrum. Phosphate was lower in fullterm milk than pretem milk. Calcium/Phosphate ratio were 2.61/1 in the preterm and 2.06/1 in the fullterm milk. Magnesium was higher in the preterm milk than fullterm milk. Zinc, Copper and Manganese concentrations were tended to lower in the preterm milk than fullterm milk.

• Proceedings of the Korean Environmental Health Society Conference
• /
• 2002.04a
• /
• pp.29-30
• /
• 2002

In this study, comparison the removal efficiencies of organics, nitrogens and phosphorus from sewage using Ultrasonic apparatus were investigated. The concentration of SCODcr were respectively 16.3, 24.4, 48.8, 105.7, 260.3 mg/$\ell$ with time 0, 10, 30, 60, 120min respectively in 200W ultrasonic intensity. The concentration of SCODcr were respectively 124.4, 48.8, 73.2, 203.4, 374.2 mg/$\ell$ with time 0, 10, 30, 60, 120min respectively in 300W ultrasonic intensity. The concentration of SCODcr were respectively 24.4, 40.7, 81.4, 170.9, 439.3 mg/$\ell$ with time 0, 10, 30, 60, 120min respectively in 400W ultrasonic intensity.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2007.10a
• /
• pp.349-350
• /
• 2007

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2007.10a
• /
• pp.215-216
• /
• 2007

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2009.10a
• /
• pp.633-634
• /
• 2009

• 한국전산유체공학회:학술대회논문집
• /
• 2007.10a
• /
• pp.49-55
• /
• 2007

The quality of chaotic mixing in three-dimensional micro channel flow has been numerically studied using Fractional-step method (FSM) and particle tracking techniques such as $Poincar{\acute{e}}$ section and Lyapunov exponents. The flow was driven by pressure distribution and the chaotic mixing was generated by applying alternating current to electrodes embedded on the bottom wall at a first half period and on the top wall at a second half period. The equations governing the velocity and concentration distributions were solved using FSM based on Finite Volume approach. Results showed that the mixing quality depended significantly on the modulation period. The modulation period for the best mixing performance was determined based on the mixing index for various initial conditions of concentration distribution. The optimal values of modulation period obtained by the particle tracking techniques were compared with those from the solution of concentration distribution equation using FSM and CFX software and the comparison showed their good match.

• Textile Coloration and Finishing
• /
• v.8 no.2
• /
• pp.25-34
• /
• 1996

Diphenyl ethanolamidophosphate(DPEAD) was synthesized for the purpose of developing a new flame retardant for cotton fabric. As the intermediate material was used diphenyl chlorophosphate(DPCP) and it was synthesized by using phosphorus oxychloride and phenol as the starting materials. The final product DPEAP was obtained by the reaction of DPCP and ethanolamine. The flame retardancy of cotton fabrics treated by DPEAP through pad-dry-cure(PDC) process was examined at various conditions. The physical property change of the DPEAP treated cotton fabrics were investigated by examining the drape stiffness, the wrinkle recovery, and the tensile strength. The results are summarized as follows: (1) DPEAP has shown excellent flame retardancy on cotton fabrics in comparison to other flame retardants for cotton fabrics available commercially. (2) The optimal condition for PDC process found was that the curing temperature was 16$0^{\circ}C$, the DPEAP concentration was 10%, the catalyst $({NH_{4})_{2}HPO_{4}$ concentration was 7.0%, and the fixing agent hexamethylol melamine (HMM)/DPEAP weight ratio was 1/8. (3) The wrinkle recovery of the processed fabrics increased with increasing DPEAP concentration. (4) The drape stiffness of the cotton fabrics treated by DPEAP have shown essentially no change until increasing DPEAP concentration to 15 %, however DPEAP concentration exceeds 20% the drape stiffness increased drastically with increasing DPEAP concentration. When DPEAP concentration is kept constant the drape stiffness increased with increasing $({NH_{4})_{2}HPO_{4}$ concentration and HMM/DPEAP weight ratio. (5) The tensile strength of the processed fabrics was lower than that of untreated fabrics, but the tensile strength retention increased with increasing DPEAP concentration.

• Journal of Korean Society for Atmospheric Environment
• /
• v.19 no.1
• /
• pp.13-23
• /
• 2003

A local wind model and a three dimensional local environmental model including advection, diffusion, deposition. and photochemical reactions were performed at Gwangyang Bay, Korea, to predict air flow and air pollutants concentrations. A large grid was used, and nesting method was employed for small grid calculation. From the meterological module simulation, we were able to reproduce local wind characteristics such as sea/land winds and mountain/valley winds simulation at Gwangyang Bay. In addition, the concentration module showed high concentration regions at Yosu industrial complex, Gwangyang steel company. and Container anchor. It was also seen that air pollutants were dispersed by sea/land winds. A comparison between the measurement and the prediction of sulfur dioxide and nitric oxide, which are relatively low-reacted pollutants, was performed. However, the measured nitrogen dioxide and ozone concentrations were higher than the simulated ones. Particularly, ozone concentration between 8 a..m. and 8 p.m. agreed well, but the measured ozone during the rest of time were generally higher.

• Microbiology and Biotechnology Letters
• /
• v.22 no.3
• /
• pp.304-308
• /
• 1994

A suitable culture method and bioreactor type for itaconic acid production were chosen by comparing the maximal concentration of itaconic acid produced in various systems. In batch culture, the maximal concentration of itaconic acid produced in a bubble column reactor was about 5% greater than that produced in stirred-tank or external-loop airlift reactor. These results were thought to be due to lower shear force and higher mass transfer efficiency in a bubble column reactor in comparison with other reactors. Moreover, the fed-batch mode in a bubble column was found to be a suitable one, producing about 25% higher concentration of itaconic acid compared to batch mode.