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임종길(Jong-Kil Lim),이태우(Tae-Woo Lee) 한국항해항만학회 2000 한국항해항만학회 학술대회논문집 Vol.1 No.2
This paper aims at exploring financing methods for port development in response to unification of South and North Korea. In so doing, methods of port financing employed by major countries have been enumerated. Major financing sources for the two Korea, among others, taxes, public bond, public administration fund, establishment of harbour maintenance tax, port development tax, port development fund, Civil Economic Cooperation Fund of South and North Korea, and Fund for Port Development of North Korea and, fund for cooperation of South and North Korea, Economic Development Cooperation Fund, borrowing of foreign capital, project financing, domestic civil capital investment, foreign capital investment, application of cross-subsidization principle, etc. were suggested.
임종길(Jong-Kil Lim),이태우(Tae-Woo Lee) 한국해양대학교 해사산업연구소 1999 海事産業硏究所論文集 Vol.9 No.-
Korean container terminals that were constructed and equipped with container cranes (C/C) by the Korea Container Port Authority have been leased out to container operators. However, the last C/C installed at the PECT and GCT were financed by the terminal operators, according to request of KCTA caused by lack of funds. Many arguments have been made on the way how to share the investment costs of the C/C between KCTA and the operators. Having said that, the paper aims to draw reasonable proposal for the recovery of the investment cost to be shared between them on the basis of thorough cost analysis.
작동유체에 따른 초음속 제트유동에 의해 생성되는 충격파 영향에 관한 수치해석
정종길(Jong-Kil Jung),윤준규(Jun-Kyu Yoon),임종한(Jong-Han Lim) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.7
고압을 사용하는 초음속 제트기술은 작동유체와 관련하여 다양한 형태의 산업 및 공학응용분야에 널리 이용되고 있다. 본 연구에서는 고압파이프에서 분출되는 초음속 제트유동에 의해 생성되는 충격파의 영향을 고찰하기 위해 ANSYS FLUENT v.16를 가지고 SST k-⍵ 난류모델을 적용하여 작동유체(공기, 산소, 수소)에 따른 압력비 및 Mach수의 유동특성을 해석하였다. CFD 해석시 경계조건으로 입구의 가스온도는 300 K이고, 압력비율은 5:1로 설정하였으며, 밀도함수는 이상기체 의 법칙을 이용하였고, 점성함수는 Sutherland 점성의 법칙을 이용하였다. 그 해석결과로 작동유체의 밀도가 작은 기체일수록 분출거리에 따라 압력비가 더 크게 떨어짐을 알 수 있었고, Mach수는 작동유체의 밀도가 높을수록 낮음을 알 수 있었다. 따라서 작동유체의 밀도에 따라 충격파의 영향이 크다는 점을 알았다. 본 연구를 토대로 다양한 작동유체에 따른 제트의 형상 및 직경 변화, 압력비의 변화 등에 따른 초음속 제트유동이 충격파에 미치는 영향에 대한 실험 및 CFD 해석연구와 실증연구가 병행하여 진행된다면 해석결과의 신뢰성은 더 높아질 것으로 사료된다 Supersonic jet technology using high pressures has been popularly utilized in diverse industrial and engineering areas related to working fluids. In this study, to consider the effects of a shock wave caused by supersonic jet flow from a high pressure pipe, the SST turbulent flow model provided in the ANSYS FLUENT v.16 was applied and the flow characteristics of the pressure ratio and Mach number were analyzed in accordance with the working fluids (air, oxygen, and hydrogen). Before carrying out CFD (Computational Fluid Dynamics) analysis, it was presumed that the inlet gas temperature was 300 K and pressure ratio was 5 : 1 as the boundary conditions. The density function was derived from the ideal gas law and the viscosity function was derived from Sutherland viscosity law. The pressure ratio along the ejection distance decreased more in the lower density working fluids. In the case of the higher density working fluids, however, the Mach number was lower. This shows that the density of the working fluids has a considerable effect on the shock wave. Therefore, the reliability of the analysis results were improved by experiments and CFD analysis showed that supersonic jet flow affects the shock wave by changing shape and diameter of the jet, pressure ratio, etc. according to working fluids.