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유영은(Yeong-Eun Yoo),서영호(Young Ho Seo),최두선(Doo-Sun Choi),이준형(Jun Hyung Lee),제태진(Tae Jin Che),황경현(Kyung Hyun Hwang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A new method is proposed to fabricate a reusable qualtz master with order of 100 nm dot pattern on its surface. Some fabrication conditions such as dose are investigated to find optimal condition. This reusable qualtz master is used directly as a stamper to injection mold the dot patterns. Polycarbonate and Polyoxymethylene are used as molding materials and the effect of the mold temperature is also investigated to see the moldabilty of the injection molding for very fine dot features.
열전도성 고분자 복합소재/금속 소재 하이브리드 구조의 방열기구 설계 및 방열특성에 관한 연구
유영은,김덕종,윤재성,박시환,Yoo, Yeong-Eun,Kim, Duck Jong,Yoon, Jae Sung,Park, Si-Hwan 한국금형공학회 2016 한국금형공학회지 Vol.10 No.3
Thermally or electrically conductive filler reinforced polymer composites are extensively being developed as the demand for light weight material increases rapidly in industiral applications need good conductivity such as heat sink of the electronics or light. Carbon or ceramic materials like graphite, carbon nanotube or boron nitride are typical conductive fillers with good thermal or electical conductivity. Using these conductive fillers, the polymer composites in the market show wide range of thermal conductivity from approximately 1 W/mK to 20 W/mK, which is quite enhanced considering the thermal conductivity lower than 0.5 W/mK for most polymeric materials. The practical use of these composites, however, is yet limited to specific applications because most composites are still not conductive enough or too difficult to process, too brittle, too expensive for higher conductivity. For practical use of conductive composite, the thermal conductivity required depending on the heat releasing mode are studied first for simplified unit cooling geometry to propose thermal conductivities of the composites for reasonable cooling performance comparing with the metal heat sink as a reference. Also, as a practical design for heat sink based on polymer composite, composite and metal sheet hybrid structures are investigated for LED lamp heat sink and audio amplication module housing to find that this hybrid structure can be a good solution considering all of the cooling performance, manufacturing, mechanical performance, cost and weight.
나노 Hair 어레이 제작을 위한 사출 성형 기술 개발
유영은(Yeong-Eun Yoo),김태훈(Tae-hoon Kim),최성주(Sung-Ju Choi),서영호(Young Ho Seo),최두선(Doo-Sun Choi),황경현(Kyung Hyun Hwang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
High aspect ratio of nano hair array on a plastic substrate is injection molded using thermoplatic materials. The diameter of the hairmolded is about 200㎚ and the length is 2㎛ ~ 10㎛, so the aspect ratio is over 10. As a template for molding, two types of AAO(Aluminum Anodizing Oxide) plate are adopted. One is though-hole type of which the thickness is about 60㎛ and another is intaglio hole type on the Al plate of about 2㎜ thickness. The overall dimension of the molded substrate with nano hair array on its surface is about 10㎜ for diameter and about 1mm for thickness. COC(Cyclic Olefin Copolymer) is used due to its goodmoldability andmechanical properties.