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홍석빈(Seokbin Hong),김원정(Wonjung Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Although paper-based microfluidic devices have recently been of great interests thanks to the critical advantages in terms of the manufacturing costs and simplicity, the dynamics of liquid imbibition through a porous medium has not entirely been understood. Washburn equation prescribes the liquid imbibition with respect to time in a one-dimensional porous medium, but it has been recently reported that Washburn equation is not valid for wax-printing channels. We present a combined experimental and theoretical investigation of water imbibition through wax-printed channels on paper. Based on the experimental observations that water imbibition depends on the channel width, we deduce a modified Washburn equation that explains how hydrophobic side walls affect imbibition dynamics in wax-printed channels. Our results provide a simple way to control flow speeds in paper-based devices.
홍석빈(Seokbin Hong),권원옥(Wonok Kwon),오명훈(MyeongHoon Oh) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
As coming the post-Moore’s Law era and growing demand for high performance bus, the need for new interconnect and bus standards have been raised. This paper deals with overview of three new interconnects and bus standards which are CCIX(Cache-Coherent Interconnect for Accelerators), OpenCAPI(Open Coherent Accelerator Processor Interface) and Gen-Z.
종이의 액체 흡수 시 셀룰로오스 섬유 내부 공극의 영향
서재덕(Jaedeok Seo),장수영(Sooyoung Chang),홍석빈(Seokbin Hong),이덕규(Duck-Gyu Lee),김원정(Wonjung Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The accurate control of liquid imbibition in paper is crucial for the applications of paper to microfluidic devices. However, the classical model for capillary flow in porous media, Washburn law, has limitations in predicting the flow in a complex fiber network such as paper. Although various physical explanations for the limitations have been suggested, we here newly report that intra-fiber pores of cellulose fibers are mainly responsible for the limited accuracy of Washburn law. Our experimental study shows that liquid may imbibe through the intra-fiber pores in cellulose fibers as well as through the inter-fiber pores formed by fiber network. We theoretically developed a hydrodynamic model for liquid imbibition through paper with the consideration of intra-fiber pores. Our theoretical predictions show a good agreement with the experimental observations, leading to the physical reasons behind the limits of Washburn law.