요중 비소농도와 N-acetyl-β-D-glucosaminidase 농도와의 관련성 평가

이용찬,임동혁,엄상용,김용대,김헌 충북대학교 의과대학 충북대학교 의학연구소 2010 忠北醫大學術誌 Vol.20 No.1

Purposes: This study was performed to evaluate the possibility of impairment of renal tubular function by exposure to inorganic arsenic of low concentration. Materials and methods: Study subjects were 867 individuals (365 men and 502 women) who resided around abandoned mine areas in Chungbuk Province, Republic of Korea. Information about the life style, drinking water type, seafood intake, and mine working history was gathered, and urinary arsenic concentration and N-acetyl-β-d-glucosaminidase (NAG) activity were measured. The correlation between arsenic concentration and urinary NAG activity was tested in groups classified according to urinary NAG activity and seafood consumption prior to urine sampling. Results: No statistically significant difference in urinary arsenic concentrations was observed between different gender and age groups. The participants those who ate seafood within three days before the urinary sample showed a higher mean urinary arsenic concentration than those who did not. In a correlation analysis between natural logarithm of urinary arsenic concentrations and that of urinary NAG activities, no statistical significance was found in a total sample as well as within a gender group. In a group with the urinary arsenic concentrations higher than the geometric mean and the urinary NAG activities higher the geometric mean, the correlation coefficient between two variables was 0.182 and significant. (p-value<0.05) Conclusions: It is suggested that renal tubular damage could be induced by non-occupational exposure to low level inorganic arsenic. 연구목적 : 본 연구는 폐금속광산 주변지역 주민들을 대상으로, 저농도 비소노출에 의하여 신세뇨관 기능이상이 유발될 수 있는지를 평가하는 것을 목적으로 시행하였다. 대상 및 방법 : 충청북도에 소재하고 있는 폐금속광산의 주변에 거주하는 주민 867명을 대상으로 직접 면접조사를 실시하였다. 대상자의 소변을 채취하여 요중 비소농도와 요중 N-acetyl-β-D-glucosaminidase (NAG) 활성을 측정하였고, 조사대상자를 역학적 변수에 따라 구분하여 두 변수 사이의 상관관계를 분석하였다. 결과 : 소변시료를 채취하기전 3일 이내에 해산물을 섭취한 사람들의 요중 비소농도는 그 기간동안 해산물을 섭취하지 않은 사람들의 농도에 비하여 유의하게 높았다. 조사 대상자들의 요중 NAG 농도의 평균값은 남녀차이가 없었으나, 65세 미만 대상자와, 표본을 채취하기 전 3일 이내에 해산물을 섭취한 사람들의 요중 NAG 활성도의 평균값은 그렇지 않은 사람들에 비하여 유의하게 낮았다. 요중 비소농도가 기하평균 이상이고, 요중 NAG 활성이 기하평균 이상인 군에서 두 변수의 상관관계가 0.182 로 유의하였다. 결론 : 정상범위의 비소 노출이라도 요중 비소농도가 8.28 μg/g creatinine을 초과하는 경우에는 미세한 신장손상을 유발할 가능성이 있으며, 해산물을 섭취함으로써 체내에 흡수되는 비소는 이러한 신독성이 거의 없다.

상해증권거래소의 거래제도와 특성

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

주식시장간 수익률 전이

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

표고 폐골목으로 제조한 목질보드의 성질

최용순,황원중,한태형,김남훈,권진헌 江原大學校 森林科學硏究所 1998 Journal of Forest Science Vol.14 No.-

要約표고폐골목의 재활용을 목적으로 폐골목과 정상재의 칩을 일정비율로 혼합하여 얻은 목질보드의 성질을 조사, 검토하였다. 그 결과 폐골목의 목섬유는 정상재보다 다소 짧고 표 면이 거칠었으며 폐골목 변재부의 밀도는 정상재에 비해 상당히 낮았다. 파티클보드의 두께 팽윤율 및 파괴계수의 시험결과 폐골목을 25~50% 정도 혼합한 경우는 정상재와 비슷한 값 을 나타냈다.결론적으로 폐골목은 파티클보드의 재료로 사용될 수 있고 정상재와의 혼합비율은 25~50% 범위에서 조정되어야 할 것으로 생각되었다.ABSTRACTTo provide further information for reutilization of the bed-logs decayed by oak mushroomfLentinus edodes), the properties of wood-based board prepared with mixed materials of normal wood and bed-logs were examined.Wood fibers in bed-logs showed different morphology from normal wood fibers, that is, shorter length and rough surface. Thickness swelling increased with increasing mixing ratio of bed-log. On the other hand, modulus of rupture(MOR) in bending strength decreased. In products, the visual surface of board prepared from higher mixing rate of bed-log chips was smooth.Consquently, it is considered that the optimum mixing rate of bed-log to normal wood is the range of 25-50% and the bed-log can be used for raw material of board instead of normal wood.

Fe-Cu-As 3원계의 비소 활량에 관해서

黃龍吉,姜憲贊 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

Fundamental studies of the behaviour of arsenic in copper smelting as well as the phase relations and arsenic activity in liquid Fe-Cu-As systems were undertaken. The arsenic activity in the liquid Fe-As stystems, Cu-As systems and Fe-Cu-As systems was determined at 1150℃ by the use of an isopiestic method. 1. The value of arsenic activity coefficient, γ°_(As)(1), was calculated to be 2×10^(-3) from the experimetal data by the solute arsenic at infinite dilution in Fe-As system at 1150℃. 2. In the genral case of arsenic has a greater affinity for Fe-As systems than for Cu-As systems. 3. The arsenic activity of Fe-Cu-As systems increases drastically in the high concentration range. 4. The liquidus and Solidus lines divide the equilbrium diagram into Fe-Cu-As system at 1150℃.

초자체흡인술이 폐쇄우각 녹내장의 전방깊이에 미치는 영향

안병헌,김창식,김용백 충남대학교 의과대학 지역사회의학연구소 1988 충남의대잡지 Vol.15 No.2

From an eye with chronic angle-closure glaucoma, 0.4 ml of vitreous was aspirated at the same time of trabeculectomy. The ultrasonographic measurement revealed decrease in the length of the vitreous cavity and increase in the depth of the anterior chamber by 0.3 mm at 2 months following the vitreous tap when compared with the preoperative measurement. The other 4 eyes which had undergone argon laser iridectomy or trabeculectomy alone did not show change in the intraocular intersegmental distances. In certain cases with chronic angle-closure glaucoma, it seemed that the vitreous tap procedure might deepen the anterior chamber following a filtration surgery and give a beneficial effect to prevent a further postoperative synechial closure of the chamber angle.

보드 레벨 플립칩의 4점 굽힘 시험 시 파단 특성 연구

이용성,정종설,이재헌,신기훈,정성균 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

In general, circuit board assemblies experience various mechanical loadings during assembly and in actual use. The repeated cyclic bending can cause electrical failures due to circuit board cracks, solder interconnects cracks, and the component cracks. In this paper, we report on the failure characteristics of board level flip chips under the repeated cyclic bending. We first describe a new 4-point bending tester, which is developed according to JEDEC standard No.. 22B113. The performance of the tester is then estimated through actual experiments . Test results reveal that the cracks first occur on the outer balls around 20,000 cycles and gradually propagate to the inner balls where cracks are found around 70,000 cycles.

우리나라 기업의 환위험 관리 사례에 관한 연구

정헌용,정구형 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.1

The purposes of this study are to examine the strategy of managing foreign exchange risk of Korean Companies. Even through a national environment with regard to foreign exchange rate has been changed, Korean Companies have been maintaining their business based on manager's discretion, traditional experiences without recognizing importance of risk management of foreign exchange. Also, in spite of being interested in such risk management of foreign exchange, most of Korean Companies have lack of knowledge on the practical way of managing such risk. Besides, a management is not a specialist in the field of risk management of foreign exchange, but it is difficult for Korean Companies having small operation to hire a specialist in that field. Therefore, this study intends to protect Korean Companies from their exposure to foreign exchange risk and fluctuation of foreign. exchange rate by proposing the method for Korean Companies to be able to simply use in order to manage such risk through introducing strategies of managing foreign exchange risk. In the future, various studies regarding risk management method of foreign exchange in Korean Companies should be continued.

우리나라 은행산업의 변화와 수익성에 대한 연구

정헌용 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.-

This study examines the factors that determine the use of derivatives by Korean local banks. To address the limited dependent variable problem, I use a tobit model. Several findings from empirical tests on 66 Korean local banks years over 2000-2004 are as follows; first, I find strong evidence that size is positively related to the use of derivatives. This result is supports the existence of scale and scope economies in derivatives markets. Additional supports are found in the results for sub-samples. Second, NIM is significantly negative. This suggests that Korean local banks use derivatives, at least in part, to protect their net interest incomes. Third, CHAR and FXLIQ are positively related to the use of derivatives, but the coefficients are not significant. I do not find evidence that Korean local banks are engaging in coordinated management of interest-rate risk and foreign-ex-change risk. If banks are practicing coordinated risk management, then the use of derivatives to hedge interest-rate risk and foreign-exchange risk should also be related to bank's credit and foreign currency exposure. Fourth, NIM is significantly positive. This finding supports the hypothesis that derivatives are used by Korean local banks as a hedging tool to reduce the possibility of financing distress. The results provides the evidence that the use of derevatives by Korean local banks is higher for banks with bigger size, lower NIM and higher leverage. The findings of this study would suggest basic framework of study about the use of derivatives by banks.

靈樞·寒熱病에 對한 硏究

蘇勇燮,鄭憲瑩,琴坰樹,朴炅 한국전통의학연구소 1998 한국전통의학지 Vol.8 No.2

The contents of Han Yul Byung(寒熱病) are explained on the basis of the so-called theory "Yin and Yang, the Five Evolutive Phases(음양오행)". The text of the Han Yul Byung(寒熱病) of the Young Chu(靈樞) was written in the Kap Ul Kyung(甲乙經) chapter 5, 7, 8, 10, 11 and 12. Also it was written in the Tae So(太素) volume 10 and 26. Also it was introduced in the Ryu Kyung(類經) volume 20, 21 and 22 by Jang Kae-Pin(張介賓) in the Myung(明) dynasty. Summarizing the contents of the Han Yul Byung in reference to the contents of successive generation note, the contents run as follows: Chapter 1 deals with the symptoms and treatment of diseases which accompany chills and fever(寒熱病). Chapter 2 deals with arthralgia with other joint systems(骨痺) and flaccid paralysis of Iimbs(體惰病). Chapter 3 deals with indications of five points around the Chen You Points(天牖穴). Chapter 4 deals with the treatment of toothache. Chapter 5 deals with the treatment of headache and eye pain. Chapter 6 deals with the acupuncture manipulation according to changes of season. Chapter 7 deals with the serious influence of carbuncle according to the region of body. Chapter 8 deals with the treatment of heat-syndrome. Chapter 9 deals with the side effect of acupuncture. It is too difficult to understand the Han Yul Byung(寒熱病), because it is written in old chinese. Consequence of above reason, the writer of this article has researched to find out the exact meaning of that.