• Title/Summary/Keyword: GG

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Whole-Cell Biocatalysis for Producing Ginsenoside Rd from Rb1 Using Lactobacillus rhamnosus GG

  • Ku, Seockmo;You, Hyun Ju;Park, Myeong Soo;Ji, Geun Eog
    • Journal of Microbiology and Biotechnology
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    • v.26 no.7
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    • pp.1206-1215
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    • 2016
  • Ginsenosides are the major active ingredients in ginseng used for human therapeutic plant medicines. One of the most well-known probiotic bacteria among the various strains on the functional food market is Lactobacillus rhamnosus GG. Biocatalytic methods using probiotic enzymes for producing deglycosylated ginsenosides such as Rd have a growing significance in the functional food industry. The addition of 2% cellobiose (w/v) to glucose-free de Man-Rogosa-Sharpe broths notably induced β-glucosidase production from L. rhamnosus GG. Enzyme production and activity were optimized at a pH, temperature, and cellobiose concentration of 6.0, 40℃, and 2% (w/v), respectively. Under these controlled conditions, β-glucosidase production in L. rhamnosus GG was enhanced by 25-fold. Additionally, whole-cell homogenates showed the highest β-glucosidase activity when compared with disrupted cell suspensions; the cell disruption step significantly decreased the β-glucosidase activity. Based on the optimized enzyme conditions, whole-cell L. rhamnosus GG was successfully used to convert ginsenoside Rb1 into Rd.

High Current Behavior and Double Snapback Mechanism Analysis of Gate Grounded Extended Drain NMOS Device for ESD Protection Device Application of DDIC Chip (DDIC 칩의 정전기 보호 소자로 적용되는 GG_EDNMOS 소자의 고전류 특성 및 더블 스냅백 메커니즘 분석)

  • Yang, Jun-Won;Kim, Hyung-Ho;Seo, Yong-Jin
    • Journal of Satellite, Information and Communications
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    • v.8 no.2
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    • pp.36-43
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    • 2013
  • In this study, the high current behaviors and double snapback mechanism of gate grounded_extended drain n-type MOSFET(GG_EDNMOS) device were analyzed in order to realize the robust electrostatic discharge(ESD) protection performances of high voltage operating display driver IC(DDIC) chips. Both the transmission line pulse(TLP) data and the thermal incorporated 2-dimensional simulation analysis as a function of ion implant conditions demonstrate a characteristic double snapback phenomenon after triggering of bipolar junction transistor(BJT) operation. Also, the background carrier density is proven to be a critical factor to affect the high current behavior of the GG_EDNMOS devices.

《일하제금집(日下題襟集)》의 내용분석 - 시(詩)를 중심으로 -

  • Gu, Gyo-Hyeon
    • 중국학논총
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    • no.69
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    • pp.145-165
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    • 2021
  • 到目前爲止, 關於天涯知己友情的逸聞, 只能依靠洪大容的《軒軒書》。現在通過分析《日下題跋集》的內容, 可以更徹底地復原245年前的乾淨衕的相遇了。本論文以《日下題跋集》收錄的95首詩作爲中心研究而成。時間上以丙戌年(1766) 2月1日到2月28日之間以見面爲主的作品爲中心進行了考察。2月3日, 金在行前往嚴誠下榻的天涯店, 與嚴誠唱起鸚鵡詩, 2月4日, 嚴誠和潘庭筠來到朝鮮駐留的玉河館, 並唱和了許多詩文。2月8日, 金在行和洪大容再次拜訪嚴誠下榻的天陞店並作詩。2月23日, 洪大容和金在行訪問了天升店, 察看了與陸飛遲來的見面過程。並查看了嚴誠的最後一首歌和他死後傳來的詩文。

A Study on the Buddhist Book of Triad Buddhist Statue in Wangryongsawon (왕룡사원(王龍寺院) 삼존불상(三尊佛像)의 복장전적(服藏典籍)에 관한 연구(硏究))

  • Song, Il-Gie
    • Journal of the Korean Society for Library and Information Science
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    • v.42 no.2
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    • pp.393-420
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    • 2008
  • This article investigates and evaluates the relics settled from the center of the chest of triad Buddhist statue which is located in the temple of Wangryong in KyungJu as a whole. Especially, it focuses on the evaluation of the value of classical book in the course of research. As a result, it is revealed that classical books, such as Dohaekumeangkyung, Myobubyeonhwakyungsammae chambub, Jangsukyung, Seonjongyounggajib are as important printing much as to be national treasure.

Ceyuan (測圓海鏡) and Jiuyong Yandai (九容演代)

  • Cheng, Chun Chor Litwin
    • Journal for History of Mathematics
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    • v.27 no.1
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    • pp.13-30
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    • 2014
  • The book ${\ll}$Ceyuan Haijing${\gg}$ studies inscribed and circumscribed circles in a right triangle and shows equations that give the diameters of the circles. We discuss the development of mathematical contents written by the scholar Yang Zhaoyun in Qing dynasty on the contents of ${\ll}$Ceyuan Haijing${\gg}$ in his book ${\ll}$Jiuyong Yandai${\gg}$. He derived equations to find the diameters of the circles based on algebraic knowledge known in the Qing dynasty. In this paper, we conclude that Yang's methods in devising the equations include the Gou-Gu Theorem, mathematical expressions derived from Gou-Gu ratio table, and the technique of interchanging triangles and events. We conclude that the Gou-Gu ratio table was a very important tool when Yang devised the equations in ${\ll}$Ceyuan Haijing${\gg}$.

Estimating evaportranspiration based on modified complementary relationship at Aisa Fluxnet sites (Asia Fluxnet 지점에서 수정된 보완관계법을 기반으로 한 증발산량 추정)

  • Seo, Ho Cheol;Kim, Jee Hee;Kim, Yeonjoo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2016.05a
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    • pp.228-228
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    • 2016
  • 증발산량은 수자원 부존량 평가, 물수지 분석, 지구의 물순환 및 에너지 순환을 이해하기 위해서 알아야할 수문량이나, 이를 산정하기 위하여 단순한 가정을 하거나 경험식을 사용하는 접근에는 신뢰성에 문제가 생긴다. 본 연구에서는 아시아 지역내의 여러 지점에서 에디공분산 시스템을 활용해 플럭스 자료를 구축해놓은 Asia Fluxnet의 자료를 활용해 보완관계법(Complimentary relationship) 기반으로 제한된 기상자료를 이용해 구한 증발산량을 산정하는 방법론들을 평가하였다. Granger and Gary(GG)는 실제 증발산량은 습윤조건의 증발산량의 2배에 잠재 증발산량간의 차와 같다는 보완관계를 수정하여 일반화하고, 잠재 증발산량을 산정하는 경험식을 제시하였다. 이러한 수정된 보완관계식을 활용한 GG 방법론을 활용하여 산정한 증발산량을 측정된 증발산량과 비교한 정확성을 정량화 하기 위해 Average root mean square error (RMSE), mean absolute bias (BIAS), coefficient of determination ($R^2$)과 같은 통계값을 이용하였다. 최종적으로 각 사이트의 기후를 Aridity Index (AI)를 이용하여 분류하였으며 분류된 기후별로 GG 방법론의 적용성을 검토하였다.

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Preparation of Shark Byproduct Extract and Gellan Gum based Antibacterial Film Containing Green Tea Extract

  • Bak, Jing-Gi;Kim, Jin;Ohk, Seung-Ho
    • Biomedical Science Letters
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    • v.28 no.1
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    • pp.50-57
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    • 2022
  • In this study, we tried to examine the possibility of developing a dental product such as tooth decay prevention and oral hygiene by manufacturing a natural polymer film for oral use. Natural polymer films were prepared from shark byproduct extract (SBE) and gellan gum (GG). As an antibacterial substance, the antibacterial activity of green tea extract against tooth decay-causing bacteria was measured. An film was prepared by adding green tea extract to the composition of SBE and GG. The mechanical, solubility, moisture content and antibacterial function of the prepared film were investigated in detail. Also, the incorporation of GTE into the SBE/GG film improved the physical performance of the film. Increasing the content of GTE improved the antioxidant and antibacterial properties of the film. Formulation of antimicrobial SBE/GG film containing green tea extract was established and these results evidently showed potential for cavity prevention products application.

A Study on Historicity of 《Three Purities Album (三淸帖)》 in the Kansong Art Museum (간송미술관 소장 《삼청첩(三淸帖)》의 역사성에 대한 고찰)

  • Baik, In-san
    • Korean Journal of Heritage: History & Science
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    • v.46 no.2
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    • pp.186-205
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    • 2013
  • ${\ll}$Three Purities Album${\gg}$ in the Kansong Art Museum is an album of poems and pictures of apricot tree, orchids and bamboos drawn by Lee Jeong. Given that the poems and pictures in the album were drawn by Lee Jeong who has been recognized as a person who established the standards of ink bamboo drawings in the Joseon Dynasty, the album is highly valuable. Nevertheless, there are more values and meanings that Three Purities Album has. The production circumstances and transmission processes of Three Purities Album include the historical characteristics and meanings of the time so that it is also worthwhile as a historical material. During the Japanese Invasion of Korea in 1592, Lee Jeong was stabbed with a sword by Japanese invaders and got injured. After he suffered, he tried to make his masterpiece in his lifework and finally created Three Purities Album. For the work, Lee Jeong received memorial writings from Choi Rip, Cha Cheon-ro and Han Ho, and asked them writings. They were the best literary men in the poem and calligraphy fields at that time. Yu Geun, Lee An-nul, and Yu Mong-in made writings and poems to praise his work. Likewise, ${\ll}$Three Purities Album${\gg}$ is the 'treasure of the time' created through the participation of the best literary men at that time. Given the aspects, it is fair to say that ${\ll}$Three Purities Album${\gg}$ is not simply a personal artwork of Lee Jeong, but is a comprehensive artwork and also a cultural monument created through the skills and capabilities of the literary artists in the middle of the Joseon Dynasty. After the death of Lee Jeong, Three Purities Album was handed over to Hong Ju-won. But, during the second Manchu Invasion into Korea in 1636, the album was in danger of disappearance by fire. As of now, there are still signs of fire in it, which vividly shows the urgent situation at that time. After the second Manchu Invasion into Korea in 1636, Hong Ju-won recovered some damaged writings with the help of Yoon Shin-ji. Since then, the album had been handed down as a family treasure over the next 7 generations. It can be found in the writings by Song Si-yeol and Uh Yu-bong. Unlike the literary men who praised Three Purities Album in terms of its work when Lee Joeng was alive, they focused on the transmission courses of the album and involved persons. That seems to be because the stories and characters appearing in Three Purities Album impressed the later literary men and were meaningful to them rather than the album itself. It strongly reflected the positions of Hong Jung-gi and Hung Sang-han who asked for writings as the descendants of Hong Ju-won. That is because the traces of the persons involved in Three Purities Album are the causes for admiring their ancestors and enhancing their political legitimacy and family dignity. Therefore, in this aspect, it is possible to witness the fundamental causes of the unique artistic awareness by East Asian people who consider their historical meanings as well as the aesthetic value of artworks significant. Unfortunately, during the Japanese invasion at the end of the Joseon Dynasty, Three Purities Album was handed over to Japanese Tzuboikouso. But, fortunately, Jeon Hyeong-pil who made an effort to regain our cultural assets by investing his entire property during the Japanese Imperialism regained the album, which is now preserved in the Kansong Art Museum. ${\ll}$Three Purities Album${\gg}$ truly includes the whole processes to overcome national crises that Korean people experienced during the Japanese Invasion in 1592, the second Manchu Invasion of Korea in 1636, and the Japanese Imperialism, and it shows the sufferings of our cultural assets and the history of preservation. Also, the album shows that one artwork is able to accumulate its historical meanings in the process of transmission and thus enhances its meanings and values. ${\ll}$Three Purities Album${\gg}$ features accumulative and constant historical meanings and it is a typical case showing that an artwork is plenty of aesthetic and historical values. It is expected that this work will contribute to promoting more studies on finding historical meanings and hysteresis of artworks.

Antioxidant activity of ginseng cultivated under mountainous forest with different growing years

  • Pan, Hong-Yan;Qu, Yang;Zhang, Jian-Kui;Kang, Ting-Guo;Dou, De-Qiang
    • Journal of Ginseng Research
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    • v.37 no.3
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    • pp.355-360
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    • 2013
  • Ginseng cultivated and grown naturally under mountainous forest is formally called "Lin-Xia-Shan-Shen" (LXSS) and grown in manual condition is called garden ginseng (GG) according to Chinese pharmacopoeia (2010 edition). Usually the growing condition of LXSS is similar to wild ginseng and mostly used in Chinese folks in ancient times. The antioxidant properties of LXSS with different growing years were evaluated by their inhibitions of thiobarbituric acid-reactive substance (TBA-RS) formation in liver homogenate and 2, 2-diphenyl-1-picrylhydrazyl (DPPH)-radical scavenging activity comparing with those of GG. The inhibitions of different polar extracts (n-butanol and water) of LXSS and GG on TBA-RS formation were also evaluated. The results showed that the antioxidant effects of LXSS were higher than those of GG and the TBA-RS formation inhibition of LXSS with longer growing years were stronger than those with shorter growing years, while the DPPH-radical scavenging activity of LXSS did not show significant difference with the change of the growing year. The results indicated that the inhibitory effect of TBA-RS formation and the DPPH-radical scavenging of LXSS were correlated with the contents of ginsenosides. In adddition, the starch contents of LXSS and GG were determined by micro-amount method with spectrophotometer. It showed that the starch content in GG was higher than that of LXSS whose starch decreased gradually with the growing year.