• YAKHAK HOEJI
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• v.39 no.5
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• pp.535-540
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• 1995

The purpose of this research was to investigate effects of glycyrrhizin on the differentiation of preadipocytes, 3T3-Ll cells and to characterize the action of glycyrrhizin that affect the responses of 3T3-Ll cells during differentiation. The differentiation of 3T3-Ll cells was stimulated by glycyrrhizin, and triglyceride contents was increased in the differentiated 3T3-LI cell extracts. Total protein contents was increased by glycyrrhizin or inductive agents in the differentiated 3T3-Ll cell extracts. Calmodulin contents was increased by inductive agents, but the contents was not affected by glycyrrhizin in the differentiated 3T3-Ll cell extracts. The results suggest that glycyrrhizin has a stimulating activity of adipose conversion, but the activity is not related to calmodulin contents during the process of differentiation of 3T3-LI cells.

• Journal of Animal Science and Technology
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• v.65 no.3
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• pp.679-682
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• 2023

The Lactococcus taiwanensis strain K_LL004 was isolated from the gut of a grasshopper (Oxya chinensis sinuosa) collected from local farm in Korea. L. taiwanensis strain K_LL004 is the functional probiotic candidate with an ability to hydrolyse plant polysaccharides. The complete genome of the L. taiwanensis strain K_LL004 contains one circular chromosome (1,995,099 bp) with a guanine + cytosine (GC) content of 38.8%. Moreover, 1,929 Protein-coding sequence, 19 rRNA genes, and 62 tRNA genes were identified based on results of annotation. L. taiwanensis strain K_LL004 has a gene, which encodes hydrolytic enzymes such as beta-glucosidase and beta-xylosidase, that hydrolyzes plant polysaccharides.

• Korean Journal of Materials Research
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• v.10 no.8
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• pp.569-574
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• 2000

To improve the ductility of $Al_3Hf$ and $Al_3Ta$ intermetallic compounds, which are the potential temperature structural materials, the mechanical alloying behaviour and the effect of ternary additions on the $Ll_2$ phase formation were investigated. During the mechanical alloying by the SPEX mill, the $Ll_2$ $Al_3Hf$ intermetallic compound was formed after 6 hours of milling in AL-25%Hf system. In AL-25%Ta system, however, only the $D0_{22}$ $Al_3Ta$ intermetallic compound was formed until 30 hours of milling and the $Ll_2$ phase was not observed. In AL-12.5%M-25%Ta(M=Cu, Zn, Mn, Fe, Ni) systems, the additions of Cu and Zn had no effect on the $D0_{22}$ structure of the binary $Al_3Hf$ and the additions of Mn, Fe and Ni produced the amorphous phase. Therefore it was considered that these ternary additions could not overcome the energy difference between $Ll_2$ and $D0_{22}$ structures in the $Al_3Hf$ intermetallic compound. In AL-12.5%M-25%Hf(M=Cu, Zn, Mn, Fe, Ni)systems, the additions of Cu and Zn did not affect the $Ll_2$ structure of the binary $Al_3Hf$ but the additions of oMn, Fe and Ni produced the amorphous phase as they did in AL-12.5%M-25%Ta systems. Therefore, it was considered that the Ni, Mn and Fe additions promote the formation of amorphous phase in $Al_3X$ intermetallic compounds.

• Korean Journal of Materials Research
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• v.9 no.10
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• pp.951-955
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• 1999

Two-phase Al-21Ti-23Cr alloy containing 20 vol.% $\textrm{Cr}_{2}\textrm{Al}$ as a second phase in the $Ll_2$ matrix is located in the two- phase region of the Al- Ti- Cr phase diagram at $1150^{\circ}C$, while in the three-phase region at $1000^{\circ}C$. Based on this result, the mechanical properties of the A1-21Ti-23Cr alloy were enhanced through the refined precipitation of the third phase in the $Ll_2$ matrix by aging the alloy below $1000^{\circ}C$. It was observed that a several ,m of the third phase precipitated in the $Ll_2$ matrix through aging at $800^{\circ}C$ and $1000^{\circ}C$, but the precipitation was not observed below $600^{\circ}C$. Furthermore, the third phase was more finely precipitated at $800^{\circ}C$ than at $1000^{\circ}C$. Although the third phase precipitated at $800^{\circ}C$ and at $1000^{\circ}C$, the compressive yield strength increased rapidly at $800^{\circ}C$ only. This is probably attributable to the refined precipitation of the third phase in the $Ll_2$ matrix. It is expected that the precipitation of the third phase. which was confirmed to be the TiAlCr phase, improves the mechanical properties by preventing crack propagation in the $Ll_2$ matrix.

• 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。

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.264-264
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• 2012

자화된 플라즈마 매질 내부에 진행하는 전자기파중에서 ${\omega}_{ci}$ ${\ll}({\omega}_{ci}{\omega}_{ce})_{1/2}{\ll}{\omega}{\ll}{\omega}_{ce}{\ll}{\omega}_{pe}$의 주파수 대역을 사용하여 헬리콘 방전을 발생시킨다. 수 kW의 RF 출력을 사용하는 헬리콘 플라즈마원은 자기장, 중성가스 압력 및 RF 주파수 등을 포함한 방전 조건에 따라 급격하게 플라즈마 밀도가 증가하고, 유사한 플라즈마 발생원에 비하여 높은 효율을 가진다. 이러한 헬리콘 플라즈마가 높은 이온화 효율을 갖는 원인을 알아보기 위해 반사계로 플라즈마 밀도를 측정하였다. 본 연구에서는 helical 타입의 안텐를 이용하여 직경 15 cm pyrex관 내부에 플라즈마를 발생시켰고, 플라즈마 진단을 위해 33~40 GHz의 주파수로 FMCW방식을 이용한 반사계로 플라즈마 밀도를 측정하였다.

• 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.

• 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${\gg}$.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.8
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• pp.765-772
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• 2006

The L2 Civil Signal (L2CS) will be transmitted by modernized IIR(IIR-M), IIF and all subsequent GPS satellites. It contains two codes of different length; CM code contains 10,230chips, repeats every 20milliseconds and is modulated with message data, and CL code contains 767,250chips, repeats every 1.5second Z-count and has no data modulation. And the message data is encoded for Forward Error Correction(FEC). The long code length is useful for weak signal, but it also requires very long acquisition time. Therefore, the structure of GPS Ll/L2C Correlator and the fast acquisition scheme are proposed in this paper.

• Proceedings of the KSPS conference
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• 2005.11a
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• pp.5-11
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• 2005

This paper gives a brief outline of STiLL related research and its practical applications in Europe, U.S.A, and Japan with a view to encouraging Korean speech scientists and developers as well as linguists and pedagogues to cooperate further for more active participation in this field. The state-of-the-art technologies, academic groups, conferences as well as major STiLL softwares are introduced followed by considerations on the current states, problems of STiLL in Korea, and some suggestions for future development.?⨀