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수용액과 β-Cyclodextrin 하에서 Arylidenethiosemicarbazone들로부터 1,3-Thiazole 유도체들의 효율적 합성
박경진,배선건,Park, Kyung-Jin,Bae, Sun Kun 한국공업화학회 2007 공업화학 Vol.18 No.4
수용액 상에서 ${\beta}$-cyclodextrin에 2,4'-dibromoacetophenone (8)을 반응시켜 착물을 형성한 후 arylidenethiosemicarbazone 7a-f를 가하여 2-arylidenehydrazinyl-4-arylthiazole 유도체들 9a-f를 70~88% 수율로 합성하였다. 합성한 새로운 화합물들 9a-f의 구조를 IR과 $^1H-NMR$ 스펙트럼 자료로 확인하였다. 이와 같은 실험결과 ${\beta}$-cyclodextrin의 역할은 반응물 7 및 8의 활성화로 반응을 촉진시켜 반응시간이 단축되는 것으로 나타났다. 2-Arylidenehydrazinyl-4-arylthiazole derivatives (9a-f) were prepared by the in situ formation of ${\beta}$-cyclodextrin complex of 2,4'-dibromoacetophenone (8) in water followed by the addition of arylidenethiosemicarbazones (7a-f) in 70~88% yield. The structures of the compounds 9a-f were elucidated by IR and $^1H-NMR$ spectral data. The role of ${\beta}$-cyclodextrin appears to activate the compound 7 and 8 and promote the reaction to complete in reduced reaction time.
죽력(竹瀝)의 문헌적(文獻的) 고찰(考察)(죽력(竹瀝)의 약침실험(藥鍼實驗)을 위한 문헌적(文獻的) 고찰(考察))
박경진,채우석,Park, Kyung-Jin,Chae, Woo-Suk 대한침구의학회 2001 대한침구의학회지 Vol.18 No.3
Objective : To research SUCCUS PHYLLOSTACHYOS through 38 kinds texts over generation for acuacupunture experiment of SUCCUS PHYLLOSTACHYOS. Methods : I studied origin, alias, species, tastes, meridian, effect, treatment, component, medical action and contraindication of SUCCUS PHYLLOSTACHYOS through 38 kinds mecical literatures. Results : Medical actions of SUCCUS PHYLLOSTACHYOS are Resolving slippery phlegm, Reducing fever, Nourishing Yin, Expelling wind and Activating blood circulation. Therefore SUCCUS PHYLLOSTACHYOS can be applied to aphonia, wind arthralgia, Diabetes, epilepsy and convulsive seizure in children. Specially for phlegm-retention due to stroke, it must be used with fresh ginger juice.
MEMS Gyroscope를 위한 feed-through 노이즈 제거 기법
박경진(Kyung-Jin Park),강성묵(Seong-Mook Kang),백창욱(Chang-Wook Baek),김호성(Ho-Seong Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.11
Since the dimensions of MEMS gyroscope are very small compared to those of conventional gyroscope, MEMS gyroscope should be able to measure charge of pico-coulomb caused by very small change of electrodes gap. However, feed-through signal from driving electrodes to the sensing electrodes due to the electromagnetic coupling is much greater than the sensing signal, which degrades the sensitivity of MEMS gyroscope. This paper introduces the feed-through noise canceling technique using dummy port and confirms the feasibility of feed-through noise canceling experimentally. Experimental results shows that, when driving signal is 6 Vpp, 30 ㎑, feed-through signal of vacuum packaged Si Gyroscope decreases from -53.2 ㏈m to -77.1 ㏈m by using feed-through reduction technique. Q-factor that could not be measured without noise reduction is measured to be about 2500 and resonance frequency to be 7.018 ㎑.
개별기업의 공시정책과 주가동조성 간 관련성에 관한 연구
박경진 ( Kyung Jin Park ),라채원 ( Chae Won Ra ) 한국회계학회 2011 회계학연구 Vol.36 No.4
본 연구는 기업의 공시정책에 따라 개별 기업의 정보가 주가에 충분히 반영되는 정도가 달라지는지 살펴보았다. S&P에서 제공하는 투명성 및 공시지수(Transparency and Disclosure Scores)가 존재하는 각 국가별 기업들을 대상으로 투명성 및 공시지수와 개별기업 정보의 반영 정도를 관찰하였으며, 개별기업 정보의 반영 정도를 측정하기 위해 주가동조성 변수를 사용하였다. 주가동조성(Stock Price Synchronicity)은 시장 주가지수가 개별 기업 주가의 변동을 얼마나 설명하는지 나타내는 상대적 지표로서, 주가동조성이 낮을수록 개별기업의 정보가 주식가격 형성에 더 많은 영향을 미친다는 것을 의미한다. 본 연구에서는 US 주식시장지수 및 각 국가별 시장지수와 각 기업의 주식수익률을 회귀분석하여 추정된 R2, 그리고 시장지수와 동일 방향으로 움직이는 상대 빈도 2가지 방법으로 주가동조성을 측정하였다. 실증분석 결과, 기업의 투명성 및 공시 점수가 높을수록 주가동조성은 낮아지는 것으로 나타났다. 또한 투명성 및 공시지수를 구성하는 세 가지 하위 범주 각각의 점수를 사용하여 분석을 실시했을 경우에도 동일한 결과를 보였다. 이는 기업의 공시정책 및 정보의 투명성이 높을수록 시장 정보보다는 개별기업의 정보가 주가에 더 많이 반영되는데 일조한다는 것을 의미하며, 또한 주가동조성 변수가 시장효율성을 나타내는 하나의 대용 지표가 될 수 있음을 확인하였다. This paper investigates the factors of firm-level disclosure practices that could have greater effects on the relative amount of firm-specific information incorporated into stock prices around the World. We define the stock price synchronicity as the extent to which the market returns explain the variation in the firm-level stock returns. It is measured as the logarithmic transformation of the R2 value obtained from a modified market model including the local market returns and the U.S. market returns. This yields an estimate of the relative amount of firm specific versus macroeconomic information influencing stock prices. Along with this estimated variable of R2, we try to use the fraction of the frequency as another kind of measure for the stock price synchronicity which explains how much times firm-level stock returns move in the same direction with the market returns in a year. As the measure of the firm-level disclosure practices, our analysis uses the Standard and Poor`s (S&P) Transparency and Disclosure (T&D) scores. We find that the more active disclosure practices of firms lead to the lower level of the stock price synchronicity, which means the firm-specific information of those firms is incorporated more fully into their stock prices. This result is stronger when we use the frequency measure of the co-movements with the market returns than the logarithmically transformed R2 estimated from a modified market model. We take one step further to see which factor among the sub-categories of S&P T&D overall score is more likely to make firm-specific information incorporated into firms` stock prices. The frequency of the co-movements with the market returns has the negative and significant relationships with all three sub-categories (financial transparency and information disclosure, ownership structure and investor relations, board and management structure and process) whereas the logarithmic transformation of R2 only show the same pattern in case of the ownership-related score. These results suggest that the more disclosure practices of firms can help firm-specific information to be incorporated into their stock price more fully so that the level of dependence on the market-wide information can be lowered. These results also show that the stock price synchronicity can be used as a proxy for efficient markets: the more efficient the market is, the lower the stock price synchronicity would be.