• Journal of the Korean Society of Fashion and Beauty
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• v.5 no.4
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• pp.139-144
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• 2007

There was an increasing interest that herbal medicine and natural material extracts were proved processes of antioxidant, cosmeceutical activity and the other effects. The aim of this study was to assess the antioxidant of extraction of four kinds from Prunus armeniaca L., Reynoutria elliptica, Curcuma aromatica, Lithospermum erythrorhizon. RE (Reynoutria elliptica) and CA (Curcuma aromatica) have good electron donating ability. The water and ethanol extract of RE at a 100 ppm concentration showed over 70%, the water extract at 500 ppm concentration showed 83% and the ethanol extract at 100 ppm concentration showed 86% of CA. Xanthine oxidase inhibition activity of the water extract of LE (Lithospermum erythrorhizon) at a 1,000 ppm concentration showed over 44%, on the other hand, RE showed in all lowest effect and there was no inhibition activity of a couple more extracts. In the measurement of nitrite scavenging activity, all extracts showed highly scavenging activity. Especially the water and ethanol extract of RE showed over 99% at 500 ppm, also LE showed over 40% at 10 ppm concentration.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.50 no.3
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• pp.244-251
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• 2014

This paper describes a prototype mechanical white noise generator has a source level of more than 170.0 dB (re $1{\mu}Pa$ at 1 m) at the frequency range of 10 Hz to 100 kHz. The results of performance evaluation of the generator are as follows. The average source level of the generator measured by a step of $15^{\circ}$ in horizontal (0 to $360^{\circ}$, 25 points) was 185.2 (SD (standard deviation): 2.3) dB (re $1{\mu}Pa$ at 1 m). The maximum and minimum source levels were appeared at the frequency range of 2.5 to 5.0 kHz and around 100 kHz, respectively. The average source levels at $0^{\circ}$, $90^{\circ}$, $180^{\circ}$ and $270^{\circ}$ were 162.9 (SD: 10.6), 168.4 (SD: 10.0), 162.1 (SD: 9.1) and 166.5 (SD: 11.1) dB (re $1{\mu}Pa$ at 1 m). The average source level measured by a step of $30^{\circ}$ in vertical was 184.9 (SD: 2.2) dB (re $1{\mu}Pa$ at 1 m). The relative maximum variation width of the source levels in horizontal and in vertical measurement were less than 7.0 dB and 1.0 dB, respectively.

• The Korea Journal of Herbology
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• v.31 no.6
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• pp.37-44
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• 2016

Objective : This study aimed to evaluate the protective effect of Artemisiae Capillaris Herba (AC) in reflux esophagitis (RE) rats. Methods : The AC was measured antioxidant activity through in vitro experiments, such as total polyphenol and flavonoid contents, 1, 1-diphenyl-2-picrylhydrazyl (DPPH) and 2, 2'-azinobis-3-ethyl-benzothiazoline-6-sulfonic acid (ABTS) radical scavenging activity. Base on the results, we had conducted in vivo experiments. Rats were divided normal, control, AC treatment 50 mg/kg BW (AC50), and AC treatment 100 mg/kg BW (AC100) groups. AC were orally administered 2 h before the induction of RE. RE was induced by tie the pylorus and the transitional junction between the forestomach and the corpus in Sprague-Dawley rats. The rats were sacrificed 5 h after the surgery. We analyzed the expression of inflammatory related markers by western blot and observed the production of reactive oxygen species (ROS) and hematoxylin-eosin staining, Results : The $IC_{50}$ of AC for DPPH and ABTS were showed 12.60 and $33.32{\mu}g/m{\ell}$ respectively. In the RE rat, AC decreased inflammatory related markers, such as phosphorylated inhibitor of ${\kappa}B{\alpha}$, nuclear factor-kappa B, cyclooxygenase-2, inducible nitric oxide synthase, and tumor necrosis factor alpha. Also, AC reduced the increased reactive oxygen species in serum. The anti-inflammatory effect of AC appeared to be partially mediated through the inhibition of ROS. Also, AC markedly ameliorated esophageal mucosa damage via the inhibition of protein expression related to inflammation. Conclusions : Therefore, these results suggest that AC would be used as a therapeutic material in protection and/or treatment for reflux esophagitis.

• The Korean Journal of Archival Studies
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• no.49
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• pp.277-297
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• 2016

Access re-review is a process to reclassify the non-disclosure documents to open accessible documents, and it has to be performed in every five years. However, current procedures of the access re-review in many archives have not been properly working, due to the shortage of the available archivists for providing enough access re-review. Although many difficult situation for the re-review such as enormous amount of re-review documents and lack of archivists, access re-review was included in the administrative evaluation list, of which it makes the re-review for just evaluating process. In this study, the access re-review of Seoul Metropolitan Office of Education, which have performed by external service companies as well as the other institutions' progresses were summarized for improving access re-review process. Although Seoul Metropolitan Office of Education processed 610,000 re-review with 100,000,000 won budget for 4 years, the project has been failed to get more budget support because of the claim for the budget efficiency. The other institutions also could not focus on the actual access re-review. Considering all the points, current access re-review process is clearly required to be improved.

• Journal of Life Science
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• v.20 no.2
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• pp.253-259
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• 2010

The neuroprotective effects of extracts from various parts of peanut sprouts on glutamate-induced neurotoxicity in N18-RE-105 cells were investigated. This study was performed to evaluate the neuroprotective activity of methanolic extracts from the whole (WME), heads (HME), and stems (SME) of peanut sprouts. The neuroprotective effects of these extracts were measured by MTT reduction assay, LDH release assay, phase-contrast microscopy, and flow cytometric analysis on the N18-RE-105 cells. Among these extracts, the HME showed the greatest neuroprotective effects, and was further fractionated with hexane, diethyl ether, ethyl acetate, and water, according to degree of polarity. Out of the fractionated extracts, the diethyl ether layer showed the highest activity on glutamate-induced cytotoxicity in N18-RE-105 cells. The sub-G1 DNA contents of the glutamate-induced severely apoptotic N18-RE-105s were measured by flow cytometric analysis to confirm the HME's anti-apoptotic activity. Interestingly, after incubation with 100 mg/ml of the HME, the proportion of sub-G1 cells of the glutamate-stressed N18-RE-105s had been greatly reduced, from 58.5% to 9.1%. These results imply that HME may have strong potential as a chemotherapeutic agent against neuronal diseases.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.9 no.3
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• pp.131-139
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• 2011

This study was carried out to examine the stability of $Na_2CO_3-H_2O_2$ carbonate solution with aging time in the dissolving solution after oxidative dissolution of U by a carbonate solution, the Cs/Re filtrate after selective precipitation of Cs and Re (as a surrogate for Tc), and the acidification filtrate after precipitation of U by acidification, respectively. The compositions of dissolving solution were not changed with ageing time, and the selective precipitation of Re and Cs was also not affected without regard to the aging time of dissolving solution. The successive removal of Cs and Re from a carbonate dissolving solution was possible. However, the recovery yield of U by acidification was decreased with increasing the aging time of the dissolving solution and the Cs/Re-filtrate, respectively, because U was converted from the uranyl peroxocarbonato complex to the uranyltricarbonate in the solution aged for a long time. Accordingly, it is effective that a dissolving solution and a Cs/Re filtrate are treated within the aging of 7 days, respectively, in order to recover U more than 99%. On the other hand, the recovery of U was carried out in order of the oxidative dissolution of U selective precipitation of Re and Cs precipitation of U by acidification. Almost all of U and a part of FP were co-dissolved in oxidative dissolution step. Over 99% of Re and Cs from the FP co-dissolved with U could be removed by a TPPCl (tetraphenylphosphonium chloride) and a NaTPB (sodium tetraphenylborate), respectively. U was precipitated nearly 100% by acidification to pH 4. Therefore, it was confirmed that the validity of recovery of U by precipitation methods from a SF (spent fuel) in the $Na_2CO_3-H_2O_2$ solution.

• Journal of computational fluids engineering
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• v.13 no.2
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• pp.1-7
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• 2008

For Aerodynamic analysis of vehicle at altitude, 100km, the validity of governing equations based on continuum model, was reviewed. Also, as the preliminary study for the sub-orbital space plane development, a candidate geometry was suggested and computational fluid dynamic(CFD) analysis was performed for various angles of attack in subsonic and supersonic flow regimes to analyze the aerodynamic characteristics and performance. The inviscid flow analyses showed that the stall starts at angle of attack above $20^{\circ}$, the maximum drag is generated at angle of attack, $87^{\circ}$ and the maximum lift to drag ratio is about 8 in subsonic flow. In supersonic, the stall angle is about $40^{\circ}$ and the maximum drag is generated at angle of attack, $90^{\circ}$. Also, mach number distribution of re-entry vehicle was computed versus altitudes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.165-168
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• 1998

Re-oxidized nitrided oxides which have been investigated as alternative gate oxide for Metal- Oxide -Semiconductor field effect devices were grown by conventional furnace process using pure NH$_3$ and dry $O_2$ gas, and were characterized via a Fowler-Nordheim Tunneling electron injection technique. We studied Ig-Vg characteristics, leakage current, $\Delta$Vg under constant current stress from electrical characteristics point of view and TDDB from reliability point of view of MOS capacitors with SiO$_2$, NO, ONO dielectrics. Also, we studied the effect of stress temperature (25, 50, 75, 100, and 1$25^{\circ}C$). Overall, our results indicate that optimized re-oxidized nitrided oxide shows improved Ig-Vg characteristics, leakage current over the nitrided oxide and SiO$_2$. It has also been shown that re-oxidized nitrided oxide have better TDDB performance than SiO$_2$ while maintaining a similar temperature and electric field dependence. Especially, the Qbd is increased by about 1.5 times.

• Journal of computational fluids engineering
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• v.1 no.1
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• pp.112-122
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• 1996

A finite element scheme using the concept of PISO method has been developed to solve the Navier-Stokes viscous flows in all speed range. This scheme includes development of new pressure equation that retains both the hyperbolic term related with the density variation and the elliptic term reflecting the incompressibility constraint. The present method is applied to the incompressible two-dimensional driven cavity flow problems(Re=100, 400 and 1,000). For compressible flows, the Carter plate problem(M=3 and Re=1,000) is computed. Finally, we have simulated the shock-boundary layer interaction(M=2 and Re=2.96×10/sup 5/), a more difficult problem, and compared its results with the experiment to demonstrate the shock capturing capability of the present solution algorithm.

• 한국전산유체공학회:학술대회논문집
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• 1995.10a
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• pp.169-174
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• 1995

A finite element scheme using the concept of PISO method has been developed to solve the viscous flow problems in all speed range. In this study, new pressure equation is proposed such that both the hyperbolic term related with the density variations and elliptic term reflecting the incompressibility constraint are included. Present method has been applied to incompressible flow in two-dimensional driven cavity(Re=100, 400 and 1,000), and its computed results are compared with other's. Also, Carter plate problem(M=3 and Re=1,000) is computed and the comparison is made with Carter's results. Finally, we simulate a shock-boundary layer interaction problem(M=2 and $Re=2.96{\times}10^5$) to illustrate the shock capturing capability of the present solution algorithm.