• Proceedings of the KIEE Conference
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• 2007.11a
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• pp.144-145
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• 2007

본 논문은 LabVIEW를 이용하여 온도측정과 amperometry 측정을 동시에 하며, amperometry 측정오차와 구동전압의 세팅 시간을 줄일 수 있는 시스템을 설계한 내용을 담고 있다. Amperometry는 구동전압을 인가하여, 전류를 측정하는 방법인데, 정확한 측정을 위해서는 구동전압을 균일하게 인가해야 한다. 또한 바이오 분야에서의 amperometry 측정은 온도에 따라 측정 결과가 다르게 나타날 수 있기 때문에 온도의 측정과 amperometry 측정이 동시에 이루어져야 측정오차를 줄일 수 있다. 본 논문에서는 이상(異常) 구동전압의 배제 알고리즘을 통하여 전류측정의 오차를 ${\pm}$70pA에서 ${\pm}$50pA이내로 줄였으며, proportional control을 응용한 알고리즘을 사용하여 307초의 측정시간을 105초로 단축하였다. 또한 amperometry 측정 과정에서 온도를 실시간으로 측정함으로써 측정상태를 보다 정확히 파악하는 시스템을 구성하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.278-278
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• 2012

최근 폴리이미드(Polyimide) 고분자 물질을 기판으로 하는 플렉시블 전자소자 구현에 관한 연구가 활발히 진행 되고 있다. 폴리이미드는 수분 흡수율이 1% 이하인 소수성 물질로서 폴리이미드 기판 위 전극 형성에 있어 전극 물질이 분리되는 현상이 발생하게 된다. 따라서 본 연구에서는 소수성의 표면 성질을 갖는 폴리이미드 기판의 Asher 처리를 통한 표면 최적화에 대한 실험을 진행하였다. 유리기판 위에 액상 폴리이미드를 ${\sim}10{\mu}m$ 두께로 Spin coating 한 후 $120^{\circ}C$ hot plate에서의 soft bake와 $200^{\circ}C$, $320^{\circ}C$의 furnace에서의 단계적 cure 과정을 통해 표면의 defect을 최소화하였다. Microwave Asher 장비를 이용하여 폴리이미드 막에 10초, 15초, 20초 동안 asher 처리를 한 후 Atomic Force Microscopy (AFM) 장비로 시간에 따른 폴리이미드 기판 표면의 변화를 확인하였다. AFM 확인 결과 10 초의 공정 조건에서 가장 우수한 표면 morphology를 보였으며, 이는 표면의 탄소와 이물질을 제거하기 위해 사용되는 asher 처리 시간이 상대적으로 증가함에 따라 폴리이미드 막의 탄소 성분이 제거 되면서 표면의 형상이 최적화 이상으로 변화하기 때문이다. 본 실험은 폴리이미드를 기반으로 하는 플렉시블 전자소자 구현에 있어 전극 및 소자 제작에 크게 기여할 것으로 판단된다.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.2120-2124
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• 2008

In order to rise up the accuracy of evaluation of egress safety for train car and facilities, analysis of egress route, scenario and the prediction by variation of flow rate were conducted. According to analysis of egress scenario for train, the extra time should be added to the time from train to safety area when the distance between the train car floor level and the track level exists. In the result of hand calculation, the egress time was 123.1 s at flow rate 0.5, was 61.5 s at flow rate 1.0, and was 41 s at flow rate 0.5.

• Journal of Animal Science and Technology
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• v.49 no.1
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• pp.121-128
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• 2007

The objective of this study was to determine the efficacy of different water temperatures and time of spray-washing on the removal of bacteria contamination from surface of pork carcass and to obtain better meat quality with high temperature stream between 60 to 90℃ for the time ranged from 10 to 60 sec. Results showed that total plate counts were significantly decreased with increasing steam temperature(P<0.05). Similar results were found with the spray time(P<0.05). The lightness(CIE L*) value was significantly increased in both loin and ham cuts over 80℃(P<0.05). Ultimate pH of muscle and water-holding capacity were decreased with increasing steam temperature(P<0.05). There was a significant difference in solubility of sarcoplasmic protein between 70℃ and 80℃ of the steam treatments with higher value at 70℃(P<0.05). Again, longer than 30 sec spray at 70℃ steam, the lightness value of pork was significantly increased(P<0.05), while pH and water-holding capacity of muscle were significantly decreased(P<0.05). Therefore, a desirable pork quality would be achieved with spray-steam washing at 70℃ for 20 sec on pork carcass.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.44 no.3
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• pp.349-362
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• 2018

An annual plant, Eclipta prostrata (Linn) is a member of the Asteraceae plant family and inhabited in tropical or subtropical regions of the world. Through many previous researches, E. prostrata has been extensively studied for its hepatoprotective effect, antivenom potential against viper venom, antioxidant, hair-growth, wound-healing efficacy and so on. In this study, for better understanding of the potential of E. prostrata as skin protectant, we conducted the experiments evaluating the antioxidant and antiaging efficacy. To this end, 50% ethanolic extract of E. prostrata and its ethyl acetate fraction were prepared and investigated. For the evaluation of antioxidant capacity of the samples, $FSC_{50}$ and $OSC_{50}$ were estimated. As a result, $OSC_{50}$ of ethyl acetate fraction was 2.7 times superior to $OSC_{50}$ of L-ascorbic acid, a well known antioxidant agent. Futhermore E. prostrata showed notable reactive oxygen species (ROS) scavenging effect and protective effect against $H_2O_2$ in the celluar level as well. Especially, in the $^1O_2$ induced hemolysis test, $64{\mu}g/mL$ of ethyl acetate fraction showed greater than 6 times increased retardation effect compare to control which means E. prostrata has remarkable antioxidant capacity. To validate the antiaging effect of the samples, we conducted elastase inhibition assay using elastase solution extracted from human skin fibroblasts, Hs68. As a result, $16{\mu}g/mL$ of each sample showed 6.8% and 14.0% of elastase inhibition respectively. Finally, antimicrobial activity of E. prostrata was assessed to validate the possibility as alternative preservative. From the result, ethyl acetate fraction showed oustanding antimicrobial activity as of methyl paraben, a well known chemical preservative. In conclusion, these results suggest that E. prostrata can be used as natural skin protectant or preservative as natural ingredient in food or cosmetics industry.

• The Journal of the Convergence on Culture Technology
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• v.5 no.2
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• pp.271-278
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• 2019

Sochi Heo Ryeon (1808 ~ 1893), who was born in Jindo in the late Joseon Dynasty, is a master of three classes, caligography, painting.It is a representative painter who is called the founder of the Honam Paintings. He learned Confucianism, Buddhism, Taoism from choui and learned the basics of painting.He became a student of Kim Chung Hee as an introduction of choui. Since then, I have correctly understood the painting aesthetic that realizes the painting by the paintings and paintings of chusa. And he succeeded it in the art world of Honam. His life and artistic features are the wandering that lasted over 70, many work activities, and details the records habit of details of "Sochisillok". Sochi's paintings aimed at Namjong painting, expressing the simple and clear beauty of the free brush and the landscape painting of ye-hwang style. In addition, the peony was painted with bizarre rocks, expressing the lively beauty by changing the brush to be called 'Heo-peony'. And it fulfilled the desire for riches and honors and the taste of Sunbee at the same time, and it became a representative material of 'Unlimsanbang' after being passed on to the house. His naturalized style of painting and painting aesthetic have been influential to the art world in modern Korea until now, forming a painter 's vein for 200 years over 5 generations.

• Science of Emotion and Sensibility
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• v.13 no.1
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• pp.69-78
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• 2010

LED technology offers versatile lighting control while having a very low environmental impact. Consequently, increasing attention is being paid to the emotional impact of LED lighting. This study investigated whether the chromacity of LED lighting influences people's time perception. To this end, two empirical studies were conducted: First, in experiment I(N=28), the subjects compared their perception of the time duration, which was varied from 3s to 20s, for 6 chromatically nuanced lighting conditions, respectively, with that under a daylight condition. The results showed that, in warm-color nuanced lighting conditions, the subjects perceived time to pass more slowly than in the daylight condition. On the contrary, in cool-color nuanced lighting conditions, the subjects perceived time to pass more rapidly than in the daylight condition. Then, in experiment II(N=39), the subjects were asked to count for 90 seconds while simultaneously performing some cognitive tasks. Confirming the results found in experiment I, the subjects perceived time to pass more rapidly in cool-color nuanced lighting conditions than in warm-color nuanced lighting conditions, although the difference was not statistically significant(p>0.05). In addition, the subjects tended to perceive the time to be shorter when the nuanced color of the light was closer to their preferred color.

• (The)Study of the Eastern Classic
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• no.69
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• pp.325-347
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• 2017

In order to examine the characteristics of the name of a thing appearing in the "Gugpung(국풍)", it was compared with the name of a thing in "The Korean annotation of the Classic of Odes(시경언해)" We have examined the reason why the names of things in "The Korean annotation of the Classic of Odes(시경언해)" and "Gugpung(국풍)" appear differently in terms of the difference between the purposes of compiling the two books and reflecting the changes in language. "The Korean annotation of the Classic of Odes(시경언해)" does not provide a proper language for the names of flora and fauna that can be easily seen in the collective term of plants or animals or in everyday life. However, in the "Gugpung (국풍)", they also presented their own words. We found the reason for the purpose of compiling the "Gugpung(국풍)". "Gugpung(국풍)" is a book made for women's education. Therefore "Gugpung(국풍)" was made not only to learn the contents but also to learn Chinese character contained in the contents. Consequently, unlike the "The Korean annotation of the Classic of Odes(시경언해)", most of the names of the Korean things are presented Although the names of the native language of "Gugpung(국풍)" and "The Korean annotation of the Classic of Odes(시경언해)" are consistent with each other, many cases have been found that appear differently. In many cases, they reflected the change of the history of the Korean language in the early 17th century, when the "The Korean annotation of the Classic of Odes(시경언해)" was published, and in the early 19th century, when the "Gugpung(국풍)" wind was written.

• Progress in Medical Physics
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• v.17 no.3
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• pp.159-166
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• 2006

The nonlinearity of hemodynamic response in the somatosensory cortex was investigated with vibrotactile stimulation. The stimuli consisted of a train of 25 Hz, each tasting five different duration periods, 2 s, 4 s, 8 s 12 s, or 16 s with 20 sec periods of no vibration in a pseudo-random order. In order to understand the linearity on the change of stimulus duration for somatosensory cortex, two different tests- checking the linearity of system and finding the impulse response function from gamma-variate function were applied to analyze the hemodynamic response functions. They have produced nearly same results. The BOLD response in the somatosensory cortex Is nonlinear for stimuli of less than 8 seconds, but nearly linear for stimuli greater than 8 seconds. The amplitude, area, TTP, and FWHM as functions of the stimulus duration were calculated and showed a significant downward trend with Increasing stimulus duration for the amplitude and the area. It supports the ranges of nonlinearity are less than 8 seconds.

• 건강소식
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• v.34 no.9
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• pp.30-33
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• 2010

계절마다 빼 놓지 않고 가는 여행지가 있는데 그 중 한 곳이 연꽃으로 가득한 연밭이다. 연꽃은 꽃마다 피는 시기가 달라 여름부터 초가을까지 볼 수 있다. 화려하면서도 단아한 연꽃은 고혹하다. 향기가 없는 것 같으면서도 향리 천리를 간다는 연꽃의 향은 꽃의 자태와도 잘 어울린다. 초록 잎이 끝없이 펼쳐진 연밭은 태양의 바다다. 해바라기 보다 넓은 잎을 펴서 이글거리는 태양의 열기를 다 받아낸다. 포화된 열기는 희고 붉은 꽃으로 피어난다. 무안군 회산 백련지는 초록빛 연잎의 바다에 보석 같은 연꽃을 피워내고 있었다.