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오갑진(GabJin Oh),안석원(Seok-Won Ahn),최종일(Jong-Il Choe) 한국무역연구원 2014 무역연구 Vol.10 No.3
We investigate a dynamical property of 18 foreign exchange rates using the minimal spanning tree method and analyze the relationship between the extreme events as global financial crisis and the structure of network in the foreign exchange rates. First, we find that the return time series in the 18 foreign exchange rates deviated from the random walk process based on the linear statistics such as mean, variance, skewness, and kurtosis and observed the homogeneity according to the each continent. In addition, the global financial crisis including the Asian currency crisis and subprime crisis play an important role in terms of a common factor that influences the network formation. Especially, since 2011, closeness among the countries in Asian currency market remain still at the same level, whereas for global currency market it shows a decrease.
오갑진(Kap Jin Oh),최윤석(Yun Seuk Choi),최일식(Il Shik Choi),박시경(Si Kyung Park),이규흥(Kyou Heung Lee),정순간(Sun Gan Chung),조의환(Eui Hwna Cho) 대한약학회 1992 약학회지 Vol.36 No.5
Astilbes rhizoma has been used for headache, arthralgia, chronic bronchitis and stomachalgia in traditional chinese medicine. The analgesic activities and their components of Astilbe chinensis var. davidii Rhizomes were evaluated. The ether and ethylacetate fractions of 70% EtOH extract showed considerable analgesic activities by acetic acid induced writhing method. Compound 1~5 were isolated from ethylacetate fraction and identified as gallic acid, (+)-catechin, (+)-gallocatechin, bergenin and 11-O-galloylbergenin on the basis of spectroscopic methods. Among them (+)-gallocatechin showed stronger analgesic activity than that of other compounds.
오갑진(Gab-Jin OH) 조선대학교 지식경영연구원 2010 기업과 혁신연구 Vol.3 No.1
본 연구는 미국의 NASDAQ 주식시장을 구성하고 있는 개별기업들의 자료를 활용하여 개별기업들간 복잡한 연결구조를 체계적으로 검증하는 것이 목적이다. 검증결과의 신뢰성을 높이기 위하여 다양한 측면에서 검증방법을 채택하여 분석하였다. 특히 실제 자료에서 구해진 주식네트워크 구조의 특성을 관찰하기 위해서 개별주식의 평균과 분산 속성만을 반영한 막걷기 (random walk) 자료와 시계열의 비선형성이 제거된 자료를 함께 사용하였다. 검증결과에 의하면, Mantegna에 의해서 소개된 최소신장트리 (minimal spanning tree, MST) 방법에 의해서 도출된 주식간 연결구조는 random network와는 상이한 특성을 가짐을 관찰할 수 있었다. 즉, 다른 주식과 많은 연결개수를 가지는 주식들 (Hub)이 존재함을 관찰하였다. 그리고 이론자료에 의해 생성된 주식네트워크는 연결개수 분포의 관점에서 random network와 매우 유사한 특성을 관찰할 수 있었다. 즉, NASDAQ 주식시장에서 관찰된 주식들간의 복잡한 연결구조는 비선형성이 기인함을 확인할 수 있었다. We investigate the complex connection structure among individual stocks listed on the NASDAQ stock market. We use 818 individual stocks listed on the NASDAQ stock market from 2001.01.03 to 2008.12.30, artificial data sets such as random data generated with mean and variance of original return time series and surrogate data removed the non-linearity from original data in order to increase the reliability of observed results. We found that the degree distribution of the stock network constructed by the minimal spanning tree (MST) method proposed by Mantegna et al. (1998) was very different features from that for an artificial data sets. Therefore, our results argue that the complex properties of MST can be attributed to the non-linearity observed in the financial time series.
안병태,오갑진,박시경,정순간,조의환,김재길,노재섭,이경순,Ahn, Byung-Tae,Oh, Kap-Jin,Park, Si-Kyung,Chung, Sun-Gan,Cho, Eui-Hwan,Kim, Jae-Gil,Ro, Jai-Seup,Lee, Kyong-Soon 한국생약학회 1996 생약학회지 Vol.27 No.3
Seven phenolic compounds were isolated from the leaves of Spiraea salicifolia. Their structures were characterized as cinnamic acid, ${\rho}-hydroxy$ cinnamic acid, ${\rho}-methoxy$ cinnamic acid, $1-O-coumaroyl-{\beta}-D-glucopyranose$, $1-O-caffeoyl-{\beta}-D-glucopyranose$, hyperoside and quercetin $3-O-(6'-O-{\alpha}-L-arbinopyranosyl)-{\beta}-D-galactopyranoside$ by chemical and spectroscopic evidence.
정선채,황방연,오갑진,강신정,김미정,최우회,이경순,노재섭,Chung, Sun-Chae,Hwang, Bang-Yeon,Oh, Gab-Jin,Kang, Shin-Jung,Kim, Mi-Jeong,Choi, Woo-Hoi,Lee, Kyong-Soon,Ro, Jai-Seup 한국생약학회 1999 생약학회지 Vol.30 No.3
Seven compounds were isolated from the n-BuOH extract of the dried stem barks of Rhus javanica L. On the basis of physico-chemical, spectroscopic evidences and comparison with authentic samples, the compounds $1{\sim}7$ were identified as gallic acid (1), methyl gallate (2), scopoletin (3), scopolin (4), $1,\;2,\;3,\;4,\;6-penta-O-galloyl-{\beta}-D-glucose$ (5), orcinol (6) and $orcinol-{\beta}-D-glucoside$ (7). Among these compounds, scopolin, $orcinol-{\beta}-D-glucoside$ were isolated from this plant for the first time.
최상길,황방연,김민수,오갑진,이경순,노재섭,Choe, Sang-Gil,Hwang, Bang-Yeon,Kim, Min-Su,Oh, Gap-Jin,Lee, Kyong-Soon,Ro, Jai-Seop 한국생약학회 1998 생약학회지 Vol.29 No.3
In the course of phytochemical studies of Rumex acetosella L. (Polygonaceae), the MeOH extract of the whole plants was fractionated with $CH_2Cl_2$ and $H_2O$, and the $CH_2Cl_2$ layer was fractionated again with 90% MeOH and hexane. Whereas $H_2O$ layer was fractionated with EtOAc and then with n-BuOH again. By repeated column chromatography, compound 1 was isolated from the 90% MeOH fraction, compounds 1, 2, 3, 4 and 5 were from the ethylacetate fraction, and compound 5 was from the n--BuOH fraction. On the basis of physico-chemical, spectroscopic evidences and in comparison with authentic samples, the structures of them were confirmed to emodin, citreorosein, $chrysophanol-8-O-{\beta}-D-glucopyranoside$, luteolin and $luteolin-7-O {\beta}-D-glucopyranoside$.
최우회,박웅양,황방연,오갑진,강신정,이경순,노재섭,Choi, Woo-Hoi,Park, Woong-Yang,Hwang, Bang-Yeon,Oh, Gap-Jin,Kang, Shin-Jung,Lee, Kyong-Soon,Ro, Jai-Seup 한국생약학회 1998 생약학회지 Vol.29 No.3
Eight compounds were isolated from the stem bark of Cornus walteri. On the basis of chemical and spectroscopic evidences, the structures of these compounds were identified as gallic acid, (+)-gallocatechin, (+)-catechin, quercetin, quercitrin, rutin, isoquercitrin and hyperoside respectively.