서울市 乘用車 要需推定模型에 관한 硏究

元濟戊,吳昌默 건국대학교 행정대학원 1987 建國大學校 行政大學院 硏究論叢 Vol.15 No.-

서울시 교통체계 형성에 관한 연구 : 1876년부터 1944년까지의 기간을 중심으로

원제무 서울시립대학교 부설 서울학연구소 1994 서울학연구 Vol.- No.2

석유화학공업 종사자의 유전독성 위험성 평가

안기원,박정선,서순팔,문재동,조진형 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.1

In order to evaluate the genotoxic hazard among workers potentially exposed to low level petrochemical substances, the analyses of micronuclei(MN) and sister chromatid exchanges(SCEs) in lymphocytes were performed in 46 male workers(as exposed group) and 46 nonexposed subjects(as control group). Mean frequencies of MN and SCEs(respectively, 12.9/1000 cells and 6.5/cell) in exposed group were very significantly higher than those(10.2/1000 cells and 5.4/cell) in control group. And there were also significant differences in mean frequencies of MN and SCEs adjusted for age, employment duration, smoking, and drinking between two groups. Median frequencies of MN and SCEs in exposed group were very significantly higher than those in control group. Frequencies of SCEs were higher in smokers than in non-smoker. Frequencies of MN in smokers, however, were similiar to those of non-smoker. Interaction between exposure and smoking on MN and SCEs induction was not observed. The results suggest that there is genotoxic hazard in high risk group like workers handling carcinogens in petrochemical plants and the analyses of MN and SCEs are useful biomarkers for the exposure to hazard substances even at the level below the exposure limit.

노동기준과 무역의 연계: 예상효과와 한국의 대응

유재원 建國大學校 經濟經營硏究所 2000 商經硏究 Vol.24 No.2

방울토마토 경영성과에 영향을 미치는 요인분석

李光遠,金再洪 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.2

In this study, certain factors influencing cherry tomato were estimated using system equations. In addition, the amount of influence to income from each factor was estimated from both direct and indirect effects. Based on OLS(Ordinary Least Squares) estimation, path analysis and factor analysis were employed to overcome multicollinearity problems. Data used in this study is interviewed cross sectional data of 65 cherry tomato producing farm in Chungnam-do area. Average age of the producers is 46.5. Average year of the production is 8 years. Average farm size, productivity, and income are 1.123 pyong, 7,439kg/10a, 8,112,000won/ 10a, respectively. The business performance of the sample farms were above average, in terms of the diagnosis by「 Standard Business Diagnosis for Cherry tomato」. To identify the factors influencing productivity, 15, 19, and 25 independent variables were selected for the dependent variables of yield, price (quality), and business cost, respectively. Finally, yield, quality, and business cost variables were set as independent variables to explain income as dependent variable. As a result of main factor analysis, 10, 12, 15, and 16 factors were identified as main factors for yield, quality, business cost, and income, respectively.

한국의 금융·자본자유화가 금융·외환위기에 미친 영향에 대한 실증분석 : The role of Capital Account Liberalization Reexamined

유재원,김태준 한국국제통상학회 2004 국제통상연구 Vol.9 No.3

본고는 자본자유화가 외환위기의 주원인이었는가라는 종래의 논의에서 벗어나 대내적 금융자유화와 대외적 자본자유화의 효과를 균형적으로 고찰하였다. 또한 금융자유화와 자본자유화의 정도를 정책변화를 중심으로 정의하는 일반적 관행과 달리 자유화의 실제효과에 근거하여 정의하였다. 이들 자유화 및 위기변수로 이루어진 벡터자기오차모형을 추정한 결과, 금음자유화나 자본자유화가 외환위기를 초래하였다는 근거는 찾기 어려웠다. 금음자유화는 신용경색을 심화시켜 금융위기를 초래하였을 확률이 상당히 높지만, 금융위기가 외환위기로 발전하였다고 보기는 어렵다. 본격적인 금리자유화나 자본시장개방이 1990년대초부터 부분적으로 이루어지기 시작한 현실을 감안하면, 이러한 결과는 별로 이상할 것이 없다고도 할 수 있다. 자유화정책이 실제로 얼마나 충실하게 실행되었는가 의문시되는 상황이라면 더욱 그럴 것이다. 한편, 금융위기가 외환위기로 연결되었다는 가설을 증명하려면 금융위기를 초래한 요인에 대한 면밀한 검토가 이루어져야 할 것이다. Capital Account liberalization, particularly the premature liberalization of short-term capital flow, has been criticized as responsible for Korea's currency crisis in 1997. However, it remains controversial what are the characteristics and the fundamental causes of the crisis. This paper aims to clarify the role of the capital account liberalization in the currency crisis from the broader perspective of financial liberalization, which began in the 1980s. After defining indices of domestic and external financial liberalization, we analyze how these variables affected the banking crisis (measured as the degree of credit crunch) and the currency crisis (measured as the foreign exchange market pressure). The empirical evidence from Korea show that it is too naive to insist that the capital account liberalization was a major cause for currency crisis. It turns out to be groundless that the banking crisis resulted in the currency crisis. Meanwhile, deregulation of interest rate in Korea seems to have substantially affected the banking crisis.

중소도시 토지이용수요추정의 실증적 분석

김재원 대불대학교 2001 論文集 Vol.7 No.1

Most of cities in Korea are using the following method of estimating demands for residential, commercial and industrial land within their urbanization ares: They are putting to use a calculation formula for by-use land areas on the basis of per capita areas required and the scale of the population. But the method above fails to take into consideration the features of indexes presenting the characteristics of cities and is being unanimously applied to most of the cities. Accordingly, this study have extracted factors related to areas in use on the basis of various kinds of city composition materials, calculating models designed to estimate demands for land use with those factors as variables. Residential areas turned out to be subjected to the greatest differences in the areas of land in use, while commercial and residential areas turned out to make few differences. And the findings show that the areas of residential regions are most influenced by the exterior factors of cities in urban planning and that it is necessary that the areas of residential areas should first be expanded for the cause of the artificial development of cities. And the calculation formula for by-use land areas turned out be appropriate for the calculation of the areas of industrial regions. The models for calculating residential areas should take into consideration the exterior factors of cities as well as urban-organization materials.

마이크로 컨트롤러를 이용한 지능구조물의 진동제어시스템 개발

황재혁,홍의표,이원석,최용훈 한국항공대학교 항공우주산업기술연구소 2003 航空宇宙産業技術硏究所 硏究誌 Vol.13 No.-

본 논문에서는 유연구조물의 진동을 제거하기 위하여 압전 세라믹(PZT)을 감지기와 작동키로 이용하였다. 진동을 제거하기 위한 제어 방법은 위치 되먹임 제어와 속도 되먹임 제어 두가지 방법을 사용하였다. 위치 되먹임 제어는 구조물의 각 지점의 위치를 감지해 내고 이를 역으로 걸어 주는 것이고 속도 되먹임 제어는 유연부착물의 각 지점에서의 속도에 대한 정보를 역으로 걸어 주는 것이다. 즉, 압전 감지기의 감지 전압을 이용해서 속도 되먹임 제어를 할 수 있다. 적용된 두 제어 방법 모두 개회로일 때 보다 좋은 성능을 나타내었다. 그러나 위치 되먹임 제어가 스필오버(spill-over)가 심했고 속도 되먹임 재어보다 정착시간(Settling Time)이 더 길었다. 본 실험에서는 속도 되먹임 제어가 적은 에너지로도 위치 되먹임 제어보다 좋은 성능을 보였다. 제어시스템을 구축하기 위해서 마이크로 컨트롤러를 사용한 제어보도를 설계하고 제작하였다. 제어 보드에 사용된 마이크로 컨트롤러는 Intel 80c196ke를 사용하였으며 마이크로 컨트롤러의 A/D, D/A 기능을 보완하기 위해서 A/D, D/A 보드를 제작하였으며, 사용자 편의와 원거리 제어를 위해서 사용자 보드를 제작하였다. 본 실험에서 제작한 제어 보드는 본 실험에 쓰인 외괄보 뿐만 아니라 압전 세라믹을 이용한 모든 구조물의 능동진동제어에 쓰인 수 있도록 제작되었다.

開途國 外債問題: 債務不履行과 債務輕減

柳在元 建國大學校 經濟經營硏究所 1996 商經硏究 Vol.21 No.1

A striking feature of international borrowing is the existence of sovereign risk. The deveolping-country debt crisis in the 1980s highlights the risk of default. This paper aims to clarify key issues central to the debt crisis and draw some lessons from it for coping with the debt problem. After reviewing causes and development of the debt crisis, it focuses on interrelated, but seemingly contradictory concepts : default and debt reduction. The paper proposes a two-period interemporal model under uncertainty of second-period income. The utility maximizing debtor compares the cost of default with the benefits from default. Accordingly, the default risk is assumed to depend on factors affecting the debt servicing capacity and the debt burden. A empirical study on the 16 highly indebted countries confirms that the default risk is positively related to the amount of debt and negatively to the economic growth rate. The debt reduction was adopted in the lated 1980s in order to deal with the debt crisis. It is shown that the market-based debt reduction is possible only if the debt reduces the default risk so that the expected amount of debt service increases. The following empirical study reveals that debt reduction during the debt crisis was actually concentrated on a few countries with the relatively sound debt servicing capacity. The debt burden is still too high for many developing countries, and negative external shocks may rekindle the debt crisis. For developing countries, it is prerequisite to improve the debt-servicing capacity in order to induce foreign capital. From the creditor's viewpoint, a more effective enforcement mechanism ensuring repayment of debt is needed in order to resolve the debt problem once and for all.

A1₂O₃/SiC 나노복합체의 소결거동과 기계적 특성에 관한 연구

이재열,이재형,김원병 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1

Al₂O₃/5vol.% SiC nanocomposites have been prepared by pressureless sintering and isostatical hot pressing to investigate sintering behaviors and mechanical properties. Al₂O₃/SiC nanocomposites with high density(more than 99% theoretical density) could be obtained by pressureless sintering and hot isostatical sintering. TEM photographs showed that SiC particles were distributed uniformly in Al₂O₃matrix with typical intra/inter type microstructure. SEM photographs showed that Al₂O₃/SiC nanocoposites had a transgranular fracture mode. Fracture strength have been increased significantly by annealing the composites owing to the surface flaw healing effect and residual compressive stress.