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이창우,장호남 한국화학공학회 1979 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.17 No.2
막을 씌운 전극을 사용하여 산소농도를 측정함에 있어서 외부에 stagnation flow를 형성시켰을 때 전류반응을 고찰하였다. stagnation flow에서 산소의 전달현상을 해석하기 위해 몇가지 가정하에 수학적 모델을 세우고 이 결과를 실험치와 비교하였다. 폴리에칠렌 막과 백금전극을 사용한 수용액에의 실험에서는 계산된 유체역학적 boundary layer의 두께가 전극의 반경보다 작거나 거의 같을 때는 유속의 변화에 대한 실험결과는 이론치와 잘 일치한다. 그러나 이보다 커지게 되면 이론치와 실험결과는 많은 차이가 있었으며 이는 일차원적 모델에서 무시되었던 반경방향의 확산이 점차적으로 중요해지기 때문으로 추측된다. 막의 두께가 두꺼워짐에 따라 수용액에서 유체역학적 상황의 변화에 따른 전류응답이 점차적으로 덜 민감해 지는 것을 알 수 있었다. The current response of a membrane covered-electrode with respect to the fluid motion in stagnation flow was investigated in this study. The mathematical model was set up to analyze oxygen transport in this flow regime. The current predicted by the model was compared with the results of the experiments performed using polyethylene film and platinum cathode. One dimensional model was in good agreement with the experimental results when the thickness of hydrodynamic boundary layer was smaller than or comparable to the radius of the electrode, but it did not agree well when the thickness exceeded the radius of the electrode. This may be due to the reason that the radial diffusion term neglected in one dimensional model becomes important as well as the axial diffusion term. It appeared that the current response became less sensitive to the hydrodynamics of the outside of membrane as the thickness of membrane increased.
컴팩트시티 개념을 적용한 국내외 도심활성화사업의 계획 특성
이창우 한국문화공간건축학회 2021 한국문화공간건축학회논문집 Vol.- No.74
Cities have declined in many countries in the course of urban growth and change. The urban sprawl accelerated urban decline and the movement of residents. Developed countries have been trying to solve these problems through compact city strategy. This study compares city policies and plans promoted by revitalization projects in five countries. I first analyze the background and progress of each country and derive the characteristics of the cases by comparing similarities and differences. Furthermore, the concept of compact city is identified by comparing according to the criteria for classifying four strategic elements (urban environment, urban community, urban structure, urban management) by analyzing policies and plans of each country. Domestic revitalization projects mainly focus on urban environment and urban community elements and carry out compact city strategy that form a hub as the center of the town. However, in terms of urban structure and urban management, financial and administrative support and organizational system is needed, along with appropriate master plans.