• Korean Journal of Pharmacognosy
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• v.40 no.4
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• pp.298-302
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• 2009

Samultang is one of traditional medicine composed of Paeonia lactiflora, Angelica gigas, Rehmannia glutinosa and Cnidium officinale. To develop simultaneous determination of paeoniflorin, decursin and 5-HMF in Samultang, a high performance liquid chromatography with diode array detector was used. To separate three marker components, Dionex $C_{18}$ column (5 ${\mu}m$, 120 ${\AA}$, 4.6 mm${\times}$150 mm) was used with a gradient elution system of water and methanol. UV wavelength of detector set at 230 nm and 280 nm. This method was validated by linearity, precision test and recovery test. Calibration curves of three standard components were showed good linear regression ($R^2$>0.9973). LOD and LOQ ranged from 0.08 ${\mu}g$/ml to 0.38 ${\mu}g$/ml and 0.25 ${\mu}g$/ml to 1.16 ${\mu}g$/ml, respectively. The relative standard deviations (RSDs) of data of the inter-day and intra-day experiments were less than 0.54% and 0.89%, respectively. The measured results of recovery test were varied from 93.36 to 107.79 with RSD values 0.01~1.45%. The established method was applied for separation of bio-conversion Samultang sample and compared with control sample.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.49-49
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• 2012

바닥재 자카드직물에 사용이 예상되는 LMP(low meltig polyester) 복합사는 사염 시 높은 수축율 및 열융착의 가능성 때문에 일반적인 폴리에스테르의 염색조건에서는 염색이 불가하다. 따라서 적정의 수축율 내에서 가능한 염색조건에 대해 고찰하였다. LMP 복합사는 웅진케미컬에서 생산된 Regular PET/LMP(75:25) 260d/48f 원사를 사용하였다. 수축율은 KS K 0215에 준하여 측정하였다. 염색은 E-type 및 S-type(Foron Dark Blue S-WF) 분산염료를 사용하였으며, E-type 중에서는 아조계(Lumacron Blue SERL 200%) 와 안트라퀴논계(Foron Blue E-BL 150)의 2 종류를 사용하였다. 염색된 시료는 현미경 단면사진을 이용하여 염료의 내부확산을 확인하였으며, 환원세정 전후의 K/S 값을 측정하였다. LMP원사의 수축율을 시험한 결과 $90^{\circ}C$에서 9% 정도의 수축율을 나타내어, $90^{\circ}C$ 이상에서는 사염이 어려운 것으로 나타났다. 따라서 염색온도는 $80^{\circ}C$와 $90^{\circ}C$로 하였다. S-type의 염료를 이용한 경우 $90^{\circ}C$에서 4일 이상 염색해도 염착이 이루어지지 않아 대상 염료에서 제외하였다. E-type 염료인 경우 아조계는 흡진율은 높았으나 내부 regular PET에의 확산이 매우 느리고, 안트라퀴논계는 상대적으로 확산이 빠른 것으로 나타났다. 안트라퀴논계 분산염료는 $80^{\circ}C$에서 내부로의 확산에 4일 이상이 소요되며, $90^{\circ}C$에서는 2일 이상이 소요되었다. 이 후 환원세정에 의한 K/S 값의 변화 및 마찰견뢰도를 시험하였으며, 환원세정 후의 섬유단면 사진을 통해 염료의 migration성을 평가하였다.

• Journal of Broadcast Engineering
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• v.11 no.2 s.31
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• pp.242-253
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• 2006

This paper presents and analyzes field test results of E-VSB(Enhanced-VSB) system proposed by Zenith/ATl and adopted ATSC standard. In the field test, according to types of antennas we measured reception possibility, noise margin, ease of reception to analyze performance improvement of E-VSB system at each outdoor/indoor test point. Also, we verify a backward compatibility between E-VSB and conventional 8-VSB system and check selection of test point, and configuration of transmitter and test vehicle. By the field test results, E-VSB system did not only outperform over 8-VSB system at severe multipath environment such as indoor reception, but also verified backward compatibility with it.

• Korean Journal of Food Science and Technology
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• v.43 no.5
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• pp.655-658
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• 2011

The possible application of Lactobacillus spp. as a functional starter culture to ferment galgeuntang (GT) and to produce bioactive isoflavone (daidzein) was investigated. Lactobacillus casei KFRI 127, L. plantarum KFRI 144, L. bulgaricus KFRI 344 were used for GT fermentation. Acid development and quantification of isoflavones using high-performance liquid chromatography were performed after fermentation at 37$^{\circ}C$ for 48 h. All the tested Lactobacillus spp. lowered pH to about 3.8 in 48 h and L. plantarum KFRI 144 exhibited 89.9% hydrolysis rate of daidzin (79.1-8.0 ${\mu}g$/mL) during fermentation. The content of daidzein in GT fermented with L. plantarum KFRI 144 was increased by 6.6-fold (3.6-23.9 ${\mu}g/mL$). These results demonstrate that L. plantarum KFRI 144 has potential as functional starter culture for manufacturing fermented GT with higher isoflavone bioavailability.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.3
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• pp.514-522
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• 2015

In Microwave Radio Link, it is necessary to consider the radio fading to consistently assure the radio link of the high quality as the distance. If the fixed modulation is used for the microwave radio link, it is difficult to keep the high availability of link for the case of the long distance. Adaptive Modulation(AM) provide good quality on microwave link, but the application of the only-AM is not enough to provide the availability assurance due to the fluctuating characteristics of link capacity. Our previous study has proposed the improvement method of transmission in association with the distance, however the previous method needed to make up for the common application. There was no suggestion of a mathematical formula with a variable. In this paper, we propose an optimized Adaptive Transmission Techniques with calculating formula of the priority traffic transmission capacity based on AM in consideration of the fade margin for the availability assurance as the distance and the comparison of the channel bandwidth for Long-distance Radio Link.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.11
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• pp.2525-2531
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• 2012

Al-Cu alloy has been used as a circuit material for its low resistance and ease to process for long years at CMOS technology. However, basically metal is very susceptible to corrosion and which has been a long pending trouble in various fields using metal. The defect causes the reliability concerns, so improved methods are necessary to reduce the defect. In the various corrosion parameters, PR strip process conditions after metal etch and optimal cleaning solutions are controllable and increase the process margin to prevent the metal corrosion. This study proposes that chlorine residue after metal etch as the source of metal corrosion, and charges should be removed by optimizing PR strip process condition and cleaning condition.

• Journal of Aerospace System Engineering
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• v.12 no.4
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• pp.35-48
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• 2018

The space qualification has to be conducted by a high level of screening to ensure the design margin of devices, materials, manufacturing processes, units, modules, and subsystem or system. The space qualification according to traditional test standards proposed by US military, NASA and ESA involve high cost and tight schedule due to their conservative requirements. It is necessary to develop a space qualification guideline that is cost-efficient and schedule-optimized for the development of domestic satellites. In this study, as a basic research to develop the space qualification guideline, the articles related to space qualification in test standards document released from military and space agency have been investigated. We are planning to utilize the results as a basic database for establishing the independent tailored space qualification guideline.

• Journal of Internet Computing and Services
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• v.18 no.4
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• pp.99-108
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• 2017

Open Science is evolving not only to share research results, but also to open the research process. We are developing the EDISON platform for the spread of open science in computational science and engineering. The EDISON platform provides online simulation services developed by computational science and engineering researchers. It also provides an environment for sharing source code, data, and related research publications. An effective simulation software registration management system is required for successful service on the EDISON platform. In this paper, we proposes a simulation software management system to provide online simulation service through EDISON platform. The proposed system allows the developer to register the simulation software on the EDISON platform without administrator intervention and effectively build a web-based simulation environment.

• KDI Journal of Economic Policy
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• v.34 no.1
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• pp.29-52
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• 2012

During the global financial turmoil in 2007-2008, deviation from the covered interest parity (CIP) between the Korean won and US dollar through the foreign exchange swap has escalated in its magnitude beyond 1,000bp in November 2008, and it still persists around 100bp level. In this paper, we examine a newly developed margin based asset pricing model using Kalman filter approach and show that the escalation of the CIP deviation is found to be significantly related to the global dollar funding illiquidity and country-specific funding conditions. Furthermore, we find evidence that the poor funding conditions (or higher margins) are driven by the general money market illiquidity and may lead to higher funding illiquidity, which suggests the reinforcing effects of the liquidity spiral. We also show that the supply of dollar liquidity and improved funding conditions help alleviate the deviations from the parity, however the persistent anomaly is found to be related to the high level of volatility in the FX swap market.

• The Korea Journal of Herbology
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• v.27 no.3
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• pp.95-100
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• 2012

Objectives : This study was carried out to investigate the acute toxicity and safety of $Leejung$-$tang$($Lizhong$-$tang$) and fermented $Leejung$-$tang$($Lizhong$-$tang$) extract. Methods : To evaluate their acute toxicity and safety, 0(control group), 1250, 2500 and 5000 mg/kg of $Leejung$-$tang$($Lizhong$-$tang$) and fermented $Leejung$-$tang$($Lizhong$-$tang$) extracts were orally administered to 35 male and 35 female ICR mice. After a single administration, we observed survival rates, general toxicity, changes of body weight, and autopsy. Results : Compared with the control group, we could not find any toxic alteration in any of treated groups (1250, 2500 and 5000 mg/kg). Conclusions : $LD_{50}$ of $Leejung$-$tang$($Lizhong$-$tang$) and fermented $Leejung$-$tang$($Lizhong$-$tang$) were over 5000 mg/kg and it is very safe to ICR mice.