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김대수,이효숙,한규진 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.6
Alkaline leaching of an uranium containing coaly shale in Okchon Series was investigated under the various oxygen partial pressure and different alkaline concentrations. The relationship between oxygen partial pressure, P, and uranium leachability, X, was determined as follows: X=kP^(0.34), X=kp^(0.11) for carbonate and carbonate-bicarbonate solutions, respectively, where k is an overall rate constant. As the carbonate concentration increased the leachability of uranium increased up to 80 %. With the mixture of carbonate-bicarbonate solutions higher leachability was obtained.
이중 주파수 액정을 적용한 액정 셔터의 고속 응답 특성
김대수,한승환,배건,전철규,Kim, Dae Soo,Han, Seung Hwan,Bae, Geon,Jhun, Chul Gyu 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.5
In this paper, by using a dual frequency liquid crystal material, we propose a liquid crystal device with a fast response characteristics. The dual frequency liquid crystal material has a positive dielectric anisotropy value at a low frequency. With a high frequency, the dielectric anisotropy becomes negative. Therefore, the relaxation process is governed by not only the elastic deformation, but also the dielectric interaction. The measured decay time and rise time were 0.88 ms and 0.33 ms, respectively.
SCM Strategy and Best Practices Implementation in SMEs
김대수,Kim Dae-Soo The Korean Operations Research and Management Scie 2006 經營 科學 Vol.23 No.1
Over the last decade, the field of supply chain management (SCM) and e-business has received an enormous amount of attention from practitioners and academicians. However, little has been known about how and to what extent small- to medium-sized enterprises (SMEs) are implementing SCM initiatives and e-business practices. This paper proposes a comprehensive research model and presents the survey results of these practices of SMEs located in Wisconsin and illinois, U.S., In terms of competitive strategy and priority, value chain activity priority, supply chain and e-business integration focus, SCM best practices implementation focus and challenges, and business performance. The analysis reveals several valuable insights into how SMEs should run their businesses in today's volatile, rapidly changing customer economy.
김대수,전봉걸 한국경제연구학회 2007 한국경제연구 Vol.18 No.-
본고는 외환위기 이후 설비자본의 효율성에 변화가 있었는지를 분석하였다. 구체적으로 자본을 설비자본과 건설자본으로 구분한 다음 설비자본의 평균생산, 한계생산 및 이윤율을 계산하고 그 움직임을 분석하였다. 분석 결과 외환위기 이전에는 설비투자의 양적 확대로 모든 효율성 지표가 하락세를 지속하였으나 외환위기 이후에는 다른 모습을 보이고 있다. 평균생산은 정체되어 있으며 한계생산은 2000년까지 상승하였다가 이후 하락세를 유지하고 있다. 제조업 이윤율은 급상승하고 있으나 자본의 생산성 향상이 아닌 저금리에 따른 자본비용 감소에 대부분 기인하는 것으로 나타났다. 이는 신규투자의 부진 지속으로 설비자본의 효율성이 최근 떨어지고 있는 것을 보여주고 있다고 판단된다. 특히 이러한 징후는 추세를 상회하는 제조업 평균가동률, 플러스의 설비투자조정압력 지속, 제품의 수명주기가 짧은 정보통신부문의 설비투자가 전체 설비투자에서 차지하는 비중 상승 등에서 유추할 수 있다. 따라서 외환위기 이후 설비투자의 부진이 장기화됨에 따라 자본축적을 둔화시키고 경제성장을 제약하는 요인이 될 가능성이 큰 것으로 판단된다. The paper conducts an analysis on whether there have been changes in the efficiency of equipment capital after the currency crisis. Concretely dividing capital into two groups, equipment capital and construction capital, it computes productivity and profit rate of equipment capital, and analyzes their movements. According to the analysis result, all the efficiency indexes continued downward trend due to the quantitative expansion of equipment investment before the currency crisis, but its pattern started to show different features after the currency crisis. Average productivity has remained stagnant and marginal productivity increased until 2000, showing downturn after that. However, the profit rate of manufacturing industry has risen drastically, which results mainly from a decrease in capital cost caused by low interest rate rather than from an increase in the productivity of captial. This fact is judged to show that the efficiency of equipment capital has fallen recently due to the continuous sluggishness of new investment. This indication can be inferred from the following facts: the average rate of operation in the manufacturing industry exceeding trend, continuous rise in the proportion of equipment investment in IT with short life span of products and etc. Therefore, it is concluded that the slowdown of new investment is highly likely to become a factor to slow capital accumulation and to constrain economic growth as it has been prolonged after the currency crisis.
화기조경탕(化氣調經湯)의 여러 가지 분획에 따른 S-180 암(癌) 세포주(細胞株) 억제(抑制) 효과(效果)
김대수,최정화,김종한,박수연,Kim, Dae-Su,Choi, Jeong-Hwa,Kim, Jong-Han,Park, Soo-Yeon 대한한방안이비인후피부과학회 2007 한방안이비인후피부과학회지 Vol.20 No.1
Objecgtive : The aim of present study was to investigate inhibition effect of Whakijogyung-Tang(WJT) on the tumor cell lines. This study estimated the cytotoxicity of WJT about viability of S-180 and NlH3T3. Methods : The cytotoxicity of WJT about viability of cells were tested using a colorimetric tetrazoliun assay(MTT assay) Results and Conclusion : 1. Water extract of WJT had $IC_{50}$ of 863 ${\mu}g/ml$ in S-180 cell lines, but cytotoxicity of NIH3T3 was not significant difference compare with S-180. 2. n-Hexane fraction of WJT had similar cytotoxicity between S-180 and NIH3T3, but that could not have $IC_{50}$ in S-180 cell lines. 3. Ethyl acetate fraction of WJT had low degree cytotoxicity both S-180 and NIH3T3 cell lines. 4. Significantly, Butanol fraction of WJT had differenct citotoxicity between S-180 and NIH3T3. 5. $H_2O_2$ fraction of WJT had no cytotoxicity both S-180 and NIH3T3.