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- 저자 : 이창우(李昌雨) (검색결과 2,618 건)
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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.
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李暢雨 東國大學校 學徒護國團 農林大學大隊 1957 東國農林 Vol.4 No.-
산림황폐방지책에서 가장 중요시되는 것은 애림사상 보급 산림계 운영강화 등도 필요한 요소이나 이보다 더 긴요하고 시급한 문제는 대용연료 증산문제라 본다. 우리나라 생활양식을 중심으로, 관찰해 볼 때 온돌 난방장치에서 필요한 연료는 거개가 도시농촌 할 것 없이 임산연료에 의존하고 있으며 이 연료문제는 가정생활에 있어서 식량과 같이 절대생활필수요소임은 재언을 요치 않는다. 이와 같이 우리 국민생활에 필요한 연량의 공급의 약 80%가 임산연료로 충당하고 있는 인과율의 법칙에 의하여 산림은 밤낮을 가리지 않고 피해를 입어 황폐를 거듭하고 있다고 보아도 부인 못할 것이다. 우리나라의 강원도 경기도 전라북도 등지에는 대용연료로서 가치가 높은 천연자원인 토탄이 무진장으로 매장되어 있으니 이와 같은 자원을 정책적으로 생산 장려하여 적극 증산하여 대량임산물 소비지인 대소도시에 보금함으로써 산림의 피해를 방지할 수 있을 것이며 대용연료 증산책이 바로 조림사방 보호사업의 결과와 같은 이론이 성립된다고 본다.
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이창우,이재학,송준엽,하태호,정영상 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
Self-adjustment module has been introduced for alignment error compensation in a previous paper. Self-adjustment module guarantees accurate arrangement of lens parts during assembly process in spite of alignment error so that remarkable price reduction and miniaturization of assembly machine could be achieved. But this module can not control lens orientation. Cellular phone camera lens is produced by plastic injection molding process, so lens has other special quality according to the orientation. In this paper assembly machine for lens module is designed to control lens orientation.
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Projective domains with non-compact automorphism groups I
이창우 대한수학회 2008 대한수학회지 Vol.45 No.5
Most of domains people have studied are convex bounded projective (or affine) domains. Edith Socie-Methou [15] characterized ellipsoid in Rn by studying projective automorphism of convex body. In this paper, we showed convex and bounded projective domains can be identified from local data of their boundary points using scaling technique developed by several mathematicians. It can be found that how the scaling technique combined with properties of projective transformations is used to do that for a projective domain given local data around singular boundary point. Furthermore, we identify even unbounded or non-convex projective domains from its local data about a boundary point Most of domains people have studied are convex bounded projective (or affine) domains. Edith Socie-Methou [15] characterized ellipsoid in Rn by studying projective automorphism of convex body. In this paper, we showed convex and bounded projective domains can be identified from local data of their boundary points using scaling technique developed by several mathematicians. It can be found that how the scaling technique combined with properties of projective transformations is used to do that for a projective domain given local data around singular boundary point. Furthermore, we identify even unbounded or non-convex projective domains from its local data about a boundary point
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이창우 청주대학교 2017 産業科學硏究 Vol.34 No.2
This study is intended to analyze the characteristics and meanings of the public spaces in four Mixed-use complex projects designed by Jerde Partnership. I analyzed the four cases by the space-perception theory of Kevin Lynch ,who proposed the five design elements (Path, Edge, District, Node, Landmark) for urban environments. Unlike other cases, Jerde projects show the design strateqies to consider the human behavior on the public spaces and collect people to enjoy their everyday-life in the public spaces. In terms of urbanism, they try to make inter-active relationship with the neighboring area by making pedestrian roads and various public spaces in their edge areas.
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이창우,이장원,강현규,신기현 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.1
The focus of this study is on the development of a mathematical model for estimating tension of a printing section by using the register error in R2R (Roll to Roll) e-Printing systems. In a printing section of conventional R2R printing systems, the tension is generally measured not for controlling but for monitoring, because the tension control may cause the occurrence of a register error. But, for high precision control, the tension in the R2R e-Printing system must be controlled as well as measured for more precise control of the register error. The tension can be measured by the loadcell in the conventional R2R systems. However, installing a loadcell on the R2R systems causes extra economic burden. In addition, the space for adding a loadcell on R2R systems is limited due to many components including dryers, lateral guider, doctor blade, ink supply unit and cooling unit. Therefore, a tension estimator can be another possibility for predicting the tension in a printing section. In this study, a new tension estimation model is proposed. The proposed model is based on the register error model, the equivalent torque equation, and the tension model considering tension transfer. Numerical simulations and experimental results showed that the proposed model was effective in estimating the tension in a printing section.
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