Heechang Park

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Gravity ventilators rely simply on air buoyancy to extract air and are widely used to exhaust air contaminants and heat from workplaces using minimal energy. They are designed to maximize the exhaust flow rate, but the rain penetration sometimes causes malfunctioning. In this study, the characteristics of rain penetration through a ventilator were examined(More)
In this paper, we proposed a new method to increase the pattern quality on the polymer film graved by a roll-to-roll hot embossing apparatus. To expand the curing time during roll-to-roll hot embossing process, a belt is used around the patterned roller. This belt applies pressure on the film and patterned roller while the generated pattern cools down. To(More)
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