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이화운,김유근,정우식,오은주,임헌호,노순아,반수진,최현정,김민선,김헌숙 부산대학교 환경문제연구소 2002 環境硏究報 Vol.20 No.-
In the view of the results investigated the effect of air pollutants that is emitted from a new generator facilities, the total estimated concentration which is the summation of a contributional concentration and observational concentration is much less than that of atmospheric environment criterion for the air pollutants. So we can predict that the operation of the new generator facilities with mitigation equipment don't seriously affect around environment. At the same time, we compared the contributional concentration of before mitigation equipment with that of after it to examine the decreasing amount due to mitigation equipment. The result showed that the concentration of SO2, NO2 and PM-10 is reduced to 25%, 30% and 26% of original value, respectively.
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장재식,강혁주,이중현,서영범,윤병구,김용섭,이구,서정일,양창헌,이창우,김정란,윤환중 東國大學校醫學硏究所 2000 東國醫學 Vol.7 No.-
유암종은 전신에 퍼져 잇는 장크롬친화성 세포에서 기원하는데 위의 유암종은 비교적 드문 질환으로 모든 유암종의 1.9~2.2%에 해당하며 위에 발생하는 종양의 1% 미만에서 보고되고 있다. 유암종은 일반적으로 증상이 비특이적이고 면역조직화학검사에 의해서 진단되기 때문에 과거에는 드물게 발견되었으나 최근 내시경 기기 및 술기의 발전과 검사 빈도의 증가 및 면역조직화학검사의 발달로 진단율이 증가 추세에 있으며, 드물지만 유암종에서 선암과 공존하는 예들이 보고되고 있다. 저자들은 심와부 동통을 주소로 내원한 70세 남자 환자의 상부위장관내시경 검사에서 위체상부의 대만곡에서 0.4×0.4 cm 크기의 중간 함몰을 가진 Yamada 1형의 용종과 함께 전정부의 전벽에서 0.8×0.5 cm 크기의 융기된 점막 소견을 보여 조직학적으로 각각 위유암종 및 위선종임을 확진한 후 내시경적 용종 절제술로 치료한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Carcinoid tumors are arisen from enterochromaffin cells, which are scattered throughout the body. These tumors are composed of variable numbers of cells that contain endocrine granules in their cytoplasm, which can be identified by immunohistochemistry and electron microscopy. Gastric carcinoid tumors are relatively rare tumor, the reported incidence being 1.9~2.2% of all carcinoid tumors and less than 1% of all gastric tumors. Sometimes, composite carcinoid tumors and adenocarcinoma is reported. We experienced a case of the coincidence of carcinoid tumor and adenoma at the other site of the stomach in a 70 year old male patient. Gastrofiberscope showed 0.4×0.4 cm sized Yamada type I polyp with central depression on the greater curvature of the proximal body and 0.8×0.5 cm sized focal slightly elevated mucosa on the anterior wall of the antrum. The endoscopic biopsy specimens revealed carcinoid tumor and tubular adenoma with moderate atypism, respectively. The carcinoid tumor and adenoma were removed by endoscopic polypectomy. According to the follow-up gastrofiberoscopy after 7 month later, both lesions were nearly normal mucosa except whitish atrophic change after polypectomy.
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췌장염에 의한 가성낭종내에 생긴 가성동맥류 : 1례 보고
오연희,이채경,김승현,이성우,양창현,이정호,이영현 동국대학교 경주대학 1996 東國論集 Vol.15 No.-
만성 췌장염의 합병증으로 생긴 가성동맥류는 드문질환으로, 반복적으로 다량의 출혈을 일으킬 수 있으며, 치료를 하지 않을 경우 사망율이 높기 때문에, 조기 진단과 치료가 필수적이다. 저자들은 38세 남자 환자에서 췌장염의 합병증으로 생긴 가성낭종내에서 발생한 가성동맥류 1예를 경험하였기에 보고하는 바이다. 가성 동맥류의 색혈류도플러상 낭종내에 양방향 흐름의 와류를 볼 수 있었다. Pancreatic Pseudoaneurysm within Pseudocyst from Pancreatitis: 1 Case Department of Diagnostic Radiology and Internal Medicine, College of Medicine,DongGuk University Yeon Hee OH M.D., Chae Kyeong Lee M.D., Seoung Hyeon Kim M.D., Sung Woo Lee M.D., Chang Heon Yang M.D., Jung Ho Lee M.D., Young Hyun Lee M.D. Pseudoaneurysm from pancreatitis is uncommon, but it can cause recurrent and massive hemorrhage. Because of high morbidity and mortality, early detection and treatment of the pseudoaneurysm is needed. We report a case of pseudoaneurysm within pseudocyst from pancreatitis. Color-flow Doppler sonography shows bidirectional flow and turbulent arterial flow, within anechoic mass.
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정헌용 남서울대학교 경영연구센터 2001 경영연구 Vol.3 No.-
Several researchers have documented the existence of abnormal returns on the announcement of an analysts' recommendation. Many of these researchers have concluded that investors would be prudent to follow the advice of analysts. This study analyzes the effect of second-hand information of the behavior of security prices using analysts' recommendations. For the four days following the publication of the recommendations, average positive abnormal returns of 2.2%. The positive abnormal return on announcement of recommendations is a result of naive buying pressure as well as the information content of the analysts' recommendations.
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정헌용 남서울대학교 1998 남서울대학교 논문집 Vol.4 No.-
This paper tests for the relations between trading volume and subsequent returns patterns in individual securities' returns and the effectiveness of equal-weighed index return. I examine value-weighted index return versus equal-weighted index return with respect to unbiasedness of the market-adjusted abnormal returns. The data consist of weekly returns and trading volume for individual stocks in the KIS-SMAT file between 1980 and 1996. The results of this study suggest that abnormal returns estimated using the price index of Korean Stock Exchange are overestimated, while abnormal returns estimated using equal-weighted index return are not overestimated.
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정헌용 남서울대학교 2011 남서울대학교 논문집 Vol.17 No.2
The Shanghai Stock Exchange(SSE) is the most preeminent stock market in mainland China in terms of listed companies, number of shares of listed, total market value, and securities turnover in value. SSE composite index takes December 19, 1990 as the base day and the total market capitalization of all the listed stocks on the same day as the base period, with a base of 100 points. It was published from July 15, 1991and is the most widely used index in China's securities market. We examine the daily stock returns over the eleven years from January 4, 2000 through December 30, 2010. Because of the test statistics of significant skewness, excess kurtosis, autocorrelations, it is reasonable to empoly GARCH models. We use the univariate GARCH(1,1)-M model developed by Engle et al.(1987).The results of the estimation of the GARCH(1,1)-M model for SSECI daily returns show that the risk premium effect on mean equation is not significant. Using the GARCH(1,1)-M model with exogenous variables, we find significant information spillover effect from KOSPI to SSECI and from SSECI to KOSPI in the mean equation. But we cannot find significant information spillover effect from KOSPI to SSECI and from SSECI to KOSPI in the variance equation. Key Words : SSE, SSECI, KOSPI, GARCH model, spillover effect
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정헌용 남서울대학교 2012 남서울대학교 논문집 Vol.18 No.2
The purpose of this study is to examine the relevence of return among stock markets in countries. We use Granger causality test to examine the revelence existing in 9 Asian countries and U.S.A. before and after 1997 Asian financial crises. As a result, first, in the total period, US stock market return transmitted to Japan, Korea, Hong Kong, and Singapore stock markets. Japan stock market return transmitted to US, Singapore, and Indonesia stock markets. And Korea stock market return transmitted to US, Malaysia, Indonesia, and Thailand stock markets. Second, in the before Asian financial crises period, we do not find the relevence of return among stock markets in countries. Third, in the after Asian financial crises period, US stock market return transmitted to Japan, Korea, Hong Kong, and Singapore stock markets. Japan stock market return transmitted to US, Hong Kong, and Singapore stock markets. And Korea stock market return transmitted to US, Hong Kong, Malaysia, Indonesia, and Thailand stock markets. The results suggest substantial increased Asian stock market comovement. This implies that the benefits of diversification within the 9 Asian stock markets have decreased over the recent years. Key Words : Granger causality, KOSPI, return spillover
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