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RISS 인기검색어
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- 저자 : 김민석(Min Sock Kim) (검색결과 2 건)
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Analysis and control of adhesion for efficient transfer printing
박정열(Jungyul Park),김민석(Min Sock Kim),이탁건(Tahk Guhn Lee),최범규(Bumkyoo Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The adhesion-based transfer printing process allows the devices to be fabricated through low temperature process, which is important for realizing flexible electronics with high mobility. Therefore, comprehensive understanding about adhesion between the solid object and the surface of elastomeric stamp (generally, polydimethylsiloxane (PDMS) is used) and the optimal strategy to control adhesion can support the effective and high yield transfer. In this paper, a novel adhesive force measurement system is developed to measure dynamic adhesive forces from the surface on the flexible stamp. The thermodynamic work of adhesion at the moment of debonding of a tip of sensor from the flexible stamp is modeled and used for developing the adhesion control strategy. The measurement results show that the work of adhesion is strongly dependent on the peel-off velocity of tip, while the indentation force has only minor effects on it. The effect of Young’s modulus of elastomeric stamp is also investigated using the model of work of adhesion based on the relation between the adhesive force and peel-off velocity. The elastomeric stamp with low Young’s modulus is preferred for efficient transfer printing.
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최범규(Bumkyoo Choi),강호진(Ho-jin Kang),김민석(Min-sock Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.6
MEMS 기술의 향상과 함께 -TAS(Micro Total Analysis System)가 개발 되어 의료 및 생물학 분야가 급속하게 성장했다. TAS의 한 분야로 Chip 위에서 소량의 sample과 반응물을 가지고 혼합공정과 분석공정이 이루어지는 LOC(Lab on a chip)에 관한 연구는 활발하게 연구되어진다. LOC는 마이크로 펌프 와 마이크로 믹서와 같은 microfludic 장치들로 구성된다. Microfluidic 시스탬의 유동이 층류 유동이므로 유체상태의 반응물들을 효율적으로 혼합하고 공급하는 것이 어렵다. 본 논문은 이송 및 혼합이 동시에 이루어지는 MHD micropump의 설계와 제작에 관해 제시하였다. 최종 개선사양은 상용 CFD 프로그램의 해석결과를 통하여 결정하였다. With the development of micrototal analysis systems (?TAS), which is a result of enhancement of MEMS technology, rapid progress has been achieved in medical and biological research. The study of lab-on-a-chip (LOC) devices, which are types of ?TAS and which integrate the functions of mixing and analyzing tiny amounts of samples and reagents on one chip, has actively progressed. An LOC comprises microfluidic components such as micromixers and micropumps. Because the flow in a microfluidic system is generally laminar, it is very difficult to efficiently mix and feed fluid reagents. This paper presents the design and the method of fabrication of an MHD micropump for mixing fluids. By using this micropump, fluids are simultaneously mixed and pumped; this is achieved by coupling the Lorentz force and force exerted by an electric charge moving in an electric field.
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