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홍장원(Jangwon Hong),장종현(Jong-hyeon Chang),박정호(Jungho Pak) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper presents a method of self-arranging solderballs by using surface energy difference. After evaporating Au which has high surface energy on Si substrates, Teflon passivation layer which has low surface energy was patterned by lift-off process. Droplets formed only on the hydrophilic Au solderball lands by the surface energy difference, not the hydrophobic Teflon surface. Scattered solderballs sticked by themselves to the wetted solderball lands on the tilted substrate. After setting preheating of 200℃ and soldering of 245℃ hot plates, the solderballs were soldered on the solderball lands and two substrates were soldered together completely. After measuring the mechanical shear strength of the soldered substrates with solderballs of 3×3, 4×4 and 5×5 arrays. the calculated shear strength per one solderball was 1.1~2.4kgf as high as the previous report.
신성수(Seongsu Shin),홍장원(Jangwon Hong),송승태(Seungtae Song) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In the future of the automobile industry, the complexity of developed vehicle types is gradually increasing in response to various power sources (internal combustion engines, electric vehicles, hydrogen fuel cell vehicles, hybrids) as well as market diversification (regulations and marketability of developed and emerging countries). The existing method of body structure development is a method suitable for the mass production system of small types. This type of the development is completed by building Standard Body Structure (GSB) including various reinforcements differentiated and applied according to the situation of each market region. For this reason, it was inevitable to increase the design/production complexity due to the diversification of product specifications. As the modular architecture development method was introduced to cope with such small-scale production of various types, we propose a body structure and the method of development that reduces complexity while maintaining the basic performance of the body (crashworthiness, durability NVH).