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현정재 ( Jung Jae Hyun ),이영훈 ( Yoong Hoon Lee ),이강오 ( Kang Oh Yi ) 한국응용경제학회 2010 응용경제 Vol.12 No.1
본 연구는 90년대 후반 외환위기와 함께 겪은 은행산업의 대규모 구조조정의 효과를 효율성 측면에서 실증분석하여 최근 논의되고 있는 은행의 대형화와 겸업화에 대한 효과를 분석한다. 특히 효율성 요인에 관한 선행연구에서 이용한 자료포락방법(data envelopment analysis)의 계량경제학적 문제점을 해결하기 위하여 Censored Tobit모형과 부트스트랩방법을 이용하여 기존의 연구방법의 추정과 추론상의 문제점을 살펴보았다. 결과적으로 기존 연구방법을 이용할 경우 유의하게 나타난 공적자금비율과 합병여부는 유의하지 않게 나타났으며 이는 기존 연구 결과를 이용한 정책 평가에 주의가 필요함을 보여준다. This paper investigates the effects of restructuring Korean banking industry following the Asian financial crisis on the economies of scale and scope based on efficiency. The present analysis takes into account the censored dependent variable and the serial correlation that have been ignored in the previous research. The result shows that the proportion of public investment fund and the merger and acquisition, which appeared significant in previous studies, do not have significant effects on the efficiency, but BIS is the only factor that has a significant effect. The study suggests that the policy implications in the literature should be applied with a special care.
프란시스 수차 모델의 러너 간극에 따른 내부유동 및 성능 특성
김승준,최영석,조용,최종웅,현정재,주원구,김진혁 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.3
In the Francis turbine, the leakage flow through the runner gaps which are between the runner and the stator structure influences the internal flow and hydraulic performance. Thus, the investigation for the flow characteristics induced by the runner gaps is important. However, the runner gaps are often disregarded by considering the time and cost of the numerical analysis. Therefore, in this study, the flow characteristics according to runner gaps of the Francis turbine model were investigated including the leakage flow of the runner cone. The three-dimensional unsteady Reynolds-averaged Navier-Stokes analyses were conducted using a scale-adaptive simulation shear stress transport as a turbulence model for observing the influence of the leakage flow on the internal flow and hydraulic performance. The efficiencies were decreased slightly with runner gaps; and the complicated flows were captured in the gaps.