• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.628-630
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• 2002

하이라이트를 구성하는데 종전에는 사람의 수작업에 의해서 이루어졌다. 요즘은 이런점을 연구를 통해 계속 자동화시키고 있는 추세이고 많은 논문들이 나오고 있다. 이 논문은 낮은 해상도의 동영상을 향상시키기 위해 Shannon Upsampling을 수행하고 적당한 임계치를 찾아내 이진영상을 만들어 전처리를 수행하고 수평 수직 히스토그램 기법과 다중프레임조함을 혼합해 자막위치를 찾는 방법을 제안한다. 이는 기존의 에지를 사용하는 방법들에 비해 간단하고 비교적 빠른 성능을 보인다.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.781-783
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• 2010

현대에 있어 뮤직비디오는 가수가 노래를 표현하고자 하는 바를 가장 잘 표현해 주는 수단 중 하나라 할 수 있다. 따라서 신곡을 발표하는 가수들은 뮤직비디오를 기본적으로 제공하는데 영상의 비주얼적인 부분뿐만 아니라 노래에 맞는 자막에도 여러 가지 표현을 구사하며 자막을 통한 감정의 표현을 추구하고 있다. 뮤직 비디오에 나타난 키네틱 타이포그래피의 감정표현의 여러 가지 표현 방법들에대해 알아보았다.

• Membrane Journal
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• v.6 no.1
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• pp.32-36
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• 1996

Acylated chitosan derivatives with several kind of acyl chain length were synthesized. Using trough, monolayers of the acylated chitosan derivatives were formed. Limiting area per glucose unit and temperature dependence of $\pi-A$ curves were determined. Multilayers were prepared by horizontal dipping method.

• Proceedings of the Membrane Society of Korea Conference
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• 1996.03a
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• pp.45-67
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• 1996

현재 투과증발은 유기용제/물의 탈수, 유기/유기분리, 이성질체의 분리, 폐수중의 유기물의 분리등에 응용이 되고 있으며, 그 중에서 유기용제/물 혼합물중 에서 물을 선택적으로 분리하여 유기용제를 농축하여 건조시키는 공정이 가장 많은 발전이 이루어졌다. 일반적으로 유기용제는 그 용도의 전개에 있어서 물을 함유하고 있을 경우 제 기능을 발휘하지 못하기 때문에 포함하고 있는 물의 농도를 가능한 최소화하여야 한다. 본 고에서는 탈수용 투과증발막의 개발에 관련하여 막재질의 선택과 탈수용으로 연구되어온 고분자막 소재에 대하여 알아보고, 실제적으로 고분자막이 유기용제의 탈수에 어떻게 응용이 되는지를 알아보겠다.

• TTA Journal
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• s.55
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• pp.37-45
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• 1998

• Korean Chemical Engineering Research
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• v.58 no.2
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• pp.171-175
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• 2020

In the proton exchange membrane fuel cells (PEMFC), the development of a reinforced membrane with improved durability by a support is actively in progress in Korea. In this study, the initial performance and characteristics of four types of reinforced membranes were compared. Reinforced membranes with higher amounts of C-F chains in the polymer membrane showed lower water diffusion coefficients due to the hydrophobicity of the C-F chains. The thicker the polymer membrane, the more the hydrogen permeability decreased and the higher the OCV. Membrane with short resistance below 1.5 Ωcm² showed OCV below 0.9 V and the lowest performance, so short resistance should be above 3.0 Ωcm². Compared with the current standard membrane, there was a similar domestic membrane, which could confirm the possibility of localization of PEMFC polymer membrane.

• Membrane Journal
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• v.5 no.2
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• pp.89-96
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• 1995

The monolayer characteristics of phosphate amphiphiles with azobenzene at air/water interface were studied by the measurment of $\pi-A$ curves and absorption spectra. Immediately after being spread on the water surface, these amphiphiles having strong intermolecular hydrogen bonding interactions showed the typical absorption spectra which resulted from domain formation. But the aggregated domains could be controlled by changing the subphase conditions (adding bulky salt and rasing pH). Addition of metal ions in subphase changes the molecular orientation of monolayer. As the metal ion charge increases ($1\leq2$ < 3 < 4 valence), the absorption maximum (310nm) of the amphiphile with azobenzene shifts to a longer wavelength (350nm) which means that the orientation of the amphiphile is tilted. These results suggest that the molecular orientation, and furthermore the aggregation state of monolayer can be possibly controlled by the interaction of metal ions with different charge types.

• Polymer(Korea)
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• v.29 no.1
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• pp.54-58
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• 2005

The hydrolytic behavior of microbial poly[(R)-3-hydroxybutyrate]](P(3HB)) has been studied by using two model systems, Langmuir monolayer and solution-grown single crystals (SCs), for elucidating the mechanism for both alkaline and enzymatic degradations. An initial degradation of SCs of P(3HB) leads to breakup lamellae parallel to their short axis (b-axis). Similarly, ridge formation on the lamellar surface appears along the b-axis at lower quenching temperature than melting temperature. Both results support that the lamellar crystals contain less-ordered and more thermally sensitive regions along the b-axis. Although the enzymatic hydrolysis of P(3HB) monolayers was similar to its alkaline one, the enzymatic degradation of P(3HB) monolayers occurred at higher constant surface pressure than the alkaline degradation. This behavior might be attributed to the size of enzymes which is much larger than that of alkaline ions; that is, the enzymes need larger contact area with monolayers to be activated.

• Korean Chemical Engineering Research
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• v.57 no.3
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• pp.338-343
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• 2019

The water transport and water content of the electrolyte membrane greatly affect the performance of the membrane in PEMFC(Proton Exchange Membrane Fuel Cell). In this study, the parameters (electroosmotic coefficient, water diffusion coefficient) of polymer membranes for water transport were measured by a simple method, and water flux and ion conductivity were simulated by using a model equation. One dimensional steady state model equation was constructed by using only the electro-osmosis and diffusion as the driving force of water transport. The governing equations were simulated with MATLAB. The electro-osmotic coefficient of $144{\mu}m$ thick polymer membranes was measured in hydrogen pumping cell, the value was 1.11. The water diffusion coefficient was expressed as a function of relative humidity and the activation energy for water diffusion was $2,889kJ/mol{\cdot}K$. The water flux and ion conductivity results simulated by applying these coefficients showed good agreement with the experimental data.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.3
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• pp.1-8
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• 2004

In this paper, we propose a method for restoring trademark and caption areas using an isophote. In our method, the image restoration problem is modeled as an optimization problem, which in our case, is solved by a cost function with isophote constraint that is minimized using a GA The technique creates an optimal connection of all pairs of isophotes disconnected by a caption in the frame. For connecting the disconnected isophotes, we estimate the value of the smoothness, given by the best chromosomes of the GA and project this value in the isophote direction. Experimental results show that the isophote operator worked better than Laplacian operator for image restoration, and the proposed method has a great possibility for automatic restoration of a region in an advertisement scene.