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이진영(Jin-Young Lee),최재형(Jae-Hyung Choi),이종근(Jong-Keun Lee),김종훈(Jong-Hoon Kim),백지현(Ji-Hyun Baek),하지리(Ji-Lee Ha),김현실(Hyun-Sil Kim),김유정(Yoo-Jung Kim),한웅수(Woong-Soo Han),김영주(Young-Ju Kim),이용대(Yong-Dae Lee) 고려대학교 보건과학연구소 2007 보건과학논집 Vol.33 No.1
Banja is the unique metal product of Korea produced by hundreds of quenching and beating an alloy of copper and tin in a ratio of 78 to 22. It has a secret that has not been solved in a scientific way. Recently, Banja became popular again as it is known of less toxicity and sterilization. Based on the trend, we examined antimicrobial activity of copper and tin alloy against E. coli to use this alloy benefit to the environmental health area. Despite of different strengths, copper and tin alloy had an effect to restrain proliferation of E. coli in the experiment. Thus, we tried to proved significance of the antimicrobial activity through statistical treatment. It is verified that about 50% of the number of colonies are reduced in 1/10 diluted solution and 30% in 1/100 diluted solution where copper and tin alloy is treated. However, the statistical significance could not be proved due to big standard deviation despite of big average reduction. It is likely to have a significant result if conducting an experiment with well-controlled strain and more samples. Banja is known of various effects such as not only the antifungal activity as in the experiment but also maintenance of the electrolytic reduction number and prevention of protein destruction and so on. Thus it is important to develop the unique property of copper and tin alloy that contains the wisdom of our ancestors to be beneficial to the environmental health area. This study thus contributes to providing fundamental data to the field.
증례 : 호흡기: 말기신질환 환자에서 발생한 미만성 폐골화증 2예
이용대 ( Yong Dae Lee ),조영민 ( Young Min Jo ),이재희 ( Jaehee Lee ),차승익 ( Seung Ick Cha ),박태인 ( Tae In Park ),김창호 ( Chang Ho Kim ) 대한내과학회 2016 대한내과학회지 Vol.90 No.4
Diffuse pulmonary ossification (DPO) is a rare condition characterized by chronic metaplastic ossification of the lung parenchyma. DPO is associated with various underlying pulmonary, cardiac, and systemic diseases. However, to our knowledge, DPO has rarely been described in patients with end-stage renal disease undergoing hemodialysis. We describe two cases of DPO diagnosed in long-term hemodialysis patients. Awareness of this rare disorder is required for a better differential diagnosis of cases presenting with bilateral diffuse micronodular lesions, including calcific opacities. (Korean J Med 2016;90:346-350)
한국 주식시장에서 주식 수익률과 거래량간의 동적관계 분석
이용대(Yong-dae Lee),박현기(Hyun-Ki Park),김수욱(Soo-ook Kim) 한국산업경제학회 2015 산업경제연구 Vol.28 No.2
본 연구는 한국 주식시장에서 주식 수익률과 거래량의 인과관계를 분석했다. 분석에 사용된 자료는 2000년 1월부터 2012년 12월까지의 일별 자료로 분석방법은 인과관계 분석과 주식 수익률과 거래량 간의 상호 영향력과 설명력을 알아보기 위해 분산분해 분석을 실시하였다. 분석은 IT버블, 카드대란, 금융위기의 기간별, 규모별, 투자 주체별로 분석을 하였다. 분석결과 시간이 지남에 따라서 상황별로 인과관계가 감소하는 모습을 확인했다. 거래량이 주식 수익률을 선도하는 경우는 극히 드물며 유의성도 낮게 측정되었다. 기간별 분석의 경우 시간이 지날수록 인과관계가 사라졌다. 규모별 분석 결과 대형주의 경우 모든 기간에서 인과관계가 나타나지 않거나 약한 관계를 보였으며, 중형주와 소형주의 경우에는 지속해서 주식 수익률이 거래량을 선도하는 것으로 나타났다. 투자 주체별 분석에서는 개인, 기관, 외국인 모두 시간이 지남에 따라 인과관계가 감소하거나 사라지는 모습을 보였다. 분산분해 분석 결과에서도 주식 수익률에 대한 거래량의 영향력과 설명력은 낮음을 확인했다. 거래량에 대한 주식 수익률의 영향력과 설명력은 주식 수익률 대한 거래량의 값보다 크게 나타났으나 시간이 지남에 따라 감소했다. 결과적으로 정보통신기술의 발달과 분석능력 향상으로 인해 주식시장에서 거래량 데이터를 통한 차익거래는 기대할 수 없다고 판단된다. This study analyzed the influence that movement of stock prices in Korean stock market have on trading volume and that trading volume has on stock prices. The analyzed data were extracted from daily data from Jan. 4, 2000 to Dec. 28, 2012 through the Korea Stock Exchange and Data Guide. At the analysis result, as time went by, it was checked that a causal relationship by situation reduced. It was very rare that trading volume led stock prices, similarity was measured low. In case of daily analysis, causal relationship disappeared over time. From the analysis result by size, in case of large-capital stocks, a causal relationship was not shown or weak relations were shown in all periods. In case of small- and medium-capital stocks, it was represented that consecutively stock prices led trading volume. At the analysis by subject of investment, as time went on, causal relations of individuals, institutions, and foreigners had decreased or disappeared. At the variance decomposition analysis, influence and explanation power of stock prices against trading volume were shown to be greater than values of trading volume against stock prices.