• 대한핵의학회지
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• 제11권1호
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• pp.33-37
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• 1977

To evaluate the diagnostic significance of the blood disappearance rate of $^{198}Au$-colloid and to evaluate the change of hepatic blood flow during position change from supine to erect, we measured the half time of blood disappearance rate of $^{198}Au$-colloid using external counting method in 94 normal persons and in 77 patients with various hepatic diseases. The results obtained were as follows: 1. In normal control, the mean blood disappearance half time of $^{198}Au$-colloid in supine position was $2.7{\pm}0.4$ minutes. There was no significant difference of hepatic blood flow in age and sex. 2. In acute hepatitis, chronic hepatitis and hepatic cirrhosis, the mean blood disappearance half times in supine position were $3.0{\pm}0.45,\;3.5{\pm}0.74,\;7.2{\pm}3.6$ minutes respectively. The hepatic blood flow of the patients with chronic hepatitis and hepatic cirrhosis were significantly decreased than that of normal control. 3. In the normal control and acute hepatitis, the decreaces of the hepatic blood flow during the position change from supine to erect were 27.7% and 22.6% respectively.

• 한국경제지리학회지
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• 제6권1호
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• pp.45-60
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• 2003

경제의 세계화가 가속화되고 도시경제변화의 주기가 단축됨에 따라 도시의 성장과 발전에 원동력이 되는 산업과 이의 집적논리에 대한 학자들의 관심이 증대하고 있다. 시장의 불확실성과 경쟁의 가속화로 인해 현대의 기업은 비용과 위험감소를 위해, 비시장적 기제들 즉, 신뢰, 협력, 상호의존 등의 사회경제적 기제에 더욱 의존하고 있으며, 명시적인 거래비용의 감소보다는 산업활동의 네트워크, 착근성, 도시의 장소적, 역사적 발전특성 등의 문화경제적 기제에 영향을 받는다. 이 연구에서는 대도시내의 서로 다른 특성을 가지는 두 개의 산업 클러스터의 비교연구를 통해 사회적 자본형성의 특성과 국지적 공간경제와 산업의 차이에 따른 제도화의 특성들을 분석한다. 즉, 100여년의 역사를 가진 시장에서 출발하여 '생산-유통-판매-사후 서비스'가 하나의 한정된 공간에서 이루어지는 동대문의류산업 집적지와 10여 년의 짧은 사무업무활동지구에서 IT중심의 벤처산업지구로 변모한 서울벤처밸리의 내적 발전특성상의 유사점과 상이점을 사회경제기제와 문화경제기제로 나누어 비교하고 서울의 공간경제 발전에의 함의점을 도출한다.

• 한국콘텐츠학회논문지
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• 제12권4호
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• pp.401-406
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• 2012

상해증권거래소는 2011년 3월 말 기준 상장 회사 905개, 상장증권 1,537개, 상장주식 949개, 상장주식 총수 2조 2,000억 주, 시가총액 19조 3,000억 위안 규모로 신흥시장의 최대 증권거래소로 자리매김을 하였으며, 앞으로 더욱 많은 발전을 할 것으로 예측되고 있다. 다른 국가의 증권거래소와는 달리 중국의 증권거래소는 상장기업 중 국유기업의 비중이 높은 특징을 지니고 있기 때문에 증권거래소에 상장된 기업들의 자본구조가 어떠한지, 더 나아가 자본구조를 결정하는 요인들이 무엇인지를 파악하는 것은 의미가 있다. 따라서 본 연구의 목적은 중국의 증권거래소 중 신흥시장의 최대 증권거래소로 부상한 중국의 대표적인 증권거래소인 상해증권거래소에 상장된 기업들 중 60%를 차지하고 있는 제조업에 속한 기업들을 대상으로 다중회귀분석을 이용하여 자본구조를 결정하는 요인들이 무엇인지를 파악하는데 있다. 본 연구결과를 요약하면 다음과 같다. 첫째, 기업규모는 부채비율에 1% 유의수준에서 유의적인 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 수익성은 부채비율에 1% 유의수준에서 유의적인 부(-)의 영향을 미치는 것으로 나타났다. 셋째, 성장성은 부채비율에 1% 유의수준에서 유의적인 정(+)의 영향을 미치는 것으로 나타났다. 넷째, 현금흐름, 최대주주 지분율, 유통주 비율은 부채비율에 부(-)의 영향을 미치는 것으로 나타났으나 통계적으로 유의하지 않았다. 본 연구결과는 투자자에 대한 정보제공 및 재무구조 개선의 기초자료로 활용될 수 있다는 점에서 의의가 있다.

• 한국가스학회지
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• 제4권2호
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• pp.7-14
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• 2000

생산지로부터 LNG 선박으로 수송되어 각 생산기지의 저장탱크로 저장되는 액화천연가스 (LNG; Liquified Natural Gas)는 극저은인 Boiling Point보다 약간 낮은 온도 ($-162^{\circ}C$)로 전송된다. LNG 전송은 배관을 통하여 이루어지며, 이로 인하여 배관 내에는 2상 유동 (2-Phase Flow)이 자주 형성된다. 본 연구에서는 일차적으로 이러한 배관내의 2상 유동대한 압력강하량 계산법을 연구하였고, 단열재와 배관 표면을 통한 외부 열유입량과 그에 따른 BOG (Boil-off Gas) 발생량 계산 방법을 연구하여, 이들을 기반으로 LNG 배관시스템의 열유동 해석 프로그램을 개발하였다. 또한 본 연구 및 프로그램 개발을 토대로 최적의 단열재 두께와 배관 Size를 구할 수 있는 최적 설계 프로그램을 구축하였다. 이는 배관설계 시 주어진 최대 허용 압력 강하량과 BOG 발생량 등의 허용 운전 조건과, 단위 길이 당 배관가격과 단위 부피당 단열재가격을 기준으로 허용 범위 내의 최소 설비 비용을 찾는 최적 설계 방법이다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.315-320
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• 2009

Thermoeconomics or exergoeconomics can be classified into the three fields of cost estimating, cost optimization, and internal cost analysis. The objective of cost estimating is to estimate each unit cost of product and allocate each cost flow of product such as electricity or hot water. The objective of optimization is to minimize the input costs of capital and energy resource or maximize the output costs of products under the given constraints. The objective of internal cost analysis is to find out the cost formation process and calculate the amount of cost flow at each state, each component, and overall system. In this study, a new thermoeconomic methodology was proposed in the three fields. The proposed methodology is very simple and obvious. That is, the equation is only each one, and there are no auxiliary equations. Any energy including enthalpy and exergy can be applied and evaluated by this equation. As a new field, the cost allocation methodology on cool air or hot air produced from an air-condition system was proposed. Extending this concept, the proposed methodology can be applied to any complex system.

• 대한산업공학회지
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• 제36권1호
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• pp.42-51
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• 2010

The semiconductor industry is highly capital and technology intensive. Technology advancement on circuit design and process improvement requires chip makers continuously to invest a new fabrication facility that costs more than 3 billion US dollars. Especially major semiconductor companies recently started to discuss 450mm fabrication substituting existing 300mm fabrication of which facilities were initiated to build in 1998. If the plan is consolidated, the yield of 450mm facility would be more than doubled compared to existing 300mm facility. In steps of this important investment, facility layout has been acknowledged as one of the most important factors to be competitive in the market. This research proposes a new concept of semiconductor facility layout using hexagonal floor plan and its compatible material flow pattern. The main objective of this proposal is to improve the productivity of the unified layout that has been popularly used to build existing facilities. In this research, practical characteristics of the semiconductor fabrication are taken into account to develop a new layout alternative based on the analysis of Chung and Tanchoco (2009). The performance of the proposed layout alternative is analyzed using computer simulation and the results show that the new layout alternative outperforms the existing layout alternative, unified layout. However, a few questions on space efficiency to the new alternative were raised in communication with industry practitioners. These questions are left for a future study.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2011년도 제44차 하계학술발표논문집 19권2호
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• pp.269-271
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• 2011

E-commerce done by between buyers and sellers mainly rely on computer networks and business transactions are carried out according to certain standards of various business activities. E-commerce is based on modern information technology and network technology, financial electronic collection, management, information technology, business and trade information networks into one, aimed at logistics, capital flow and information flow of harmony and unity of the new trade, trade activities of the entire process, electronic, networking and digital. In this paper, we investigate for online shopping, for example, to illustrate the current problems in an area of clothes market. Also we proposed an ideal model appropriate to increase sales and show the analysis results compared to conventional clothes market in open market.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.602-607
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• 2013

Financial risks associated with capital investments are often measured with different feasibility indicators such as the net present value (NPV), the internal rate of return (IRR), the payback period (PBP), and the benefit-cost ratio (BCR). This paper aims at demonstrating practical applications of probabilistic feasibility analysis techniques for an integrated feasibility evaluation of the IRR and PBP. The IRR and PBP are concurrently analyzed in order to measure the profitability and liquidity, respectively, of a cash flow. The cash flow data of a real wind turbine project is used in the study. The presented approach consists of two phases. First, two newly reported analysis techniques are used to carry out a series of what-if analyses for the IRR and PBP. Second, the relationship between the IRR and PBP is identified using Monte Carlo simulation. The results demonstrate that the integrated feasibility evaluation of stochastic cash flows becomes a more viable option with the aide of newly developed probabilistic analysis techniques. It is also shown that the relationship between the IRR and PBP for the wind turbine project can be used as a predictive model for the actual IRR at the end of the service life based on the actual PBP of the project early in the service life.

• 통상정보연구
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• 제11권4호
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• pp.347-372
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• 2009

International investment has been gaining the importance in the economic growth, employment and technological spillover for many countries at the time of unrestrained flow of the production resources, inter alia, the capital. International investment is prerequisite for Korea to overcome its resource-scarcity. This paper studied some contentious issues of international investment and attempted to suggest negotiating position for Korea on future FTAs. We have made theoretical research of the issues and derived common denominators from four previous FTAs which Korea has concluded. Based on both theories and evidences, we suggest that Korea be ready to have more open attitude for incoming international investment, that is, foreign direct investment(FDI) in future FTA negotiations although Korea should have rather flexible strategy on international investment issues, on the basis of the reciprocity.

• 대한산업공학회지
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• 제32권4호
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• pp.298-313
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• 2006

Six sigma is focused on quality improvement through variation reduction, while lean is on process flow improvement and lead time reduction by waste elimination. However, lean cannot bring a process under statistical control and six sigma alone cannot dramatically improve process speed. Lean six sigma was developed to achieve faster rate of improvement in customer satisfaction, cost, quality, process speed, and invested capital. In this paper we present the importance of using value stream mapping and suggest a guideline on how to integrate lean and six sigma by is proposed.