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Effect of liquid bulk density on thermal resistance at a liquid-solid interface
한민섭 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.1
Thermal boundary resistance (TBR) at a liquid-solid interface that consists of simple Lennard-Jones atoms is studied by molecular dynamics simulation. A liquid layer is confined narrowly between flat solid surfaces in the simulation, and the mean density of the confined liquid is varied. A thermal gradient is imposed in the system by applying constant heat flux, and TBR is calculated using the temperatureprofile results. TBR is highly dependent on the bulk density of liquid when the liquid does not wet well with the solid. The bulk density gives a dominant influence over the liquid-side structure at the interface, which determines TBR in part. In the system of fluid on a high energy solid surface, the wetting system, even when the interfacial structure shows a marked dependence on the density, TBR depends less on the bulk fluid density.
Effect of non-uniform fields on DNA entering nano-channel
한민섭,김병철 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11
The translocation of deoxyribonucleic-acid (DNA) segments into a nanoscale channel from a bulk solution has significance to genome-related fields such as gene sequencing and genetic profiling. However, its dynamic characteristics are poorly understood because of complexities involving the size and character of the confining spaces, polymeric evolution, and driving sources. The DNA translocation was studied by mesoscale simulation using a worm-like-chain model of DNA and the dissipative particle dynamics method. Three driving sources — electric field, suction flow, and constant body force were individually applied to a λ-DNA entering a nanoscale cylindrical channel. Each source altered the translocation actions, mainly due to marked differences in conformational transformation processes. The suction flow uniquely induced strong extension of the DNA chain before channel entry. Consequently, the flow was more effective at overcoming the free-energy barrier with narrower confinements. Other driving sources permitted the DNA chain to enter in a more globular form, which was effective for larger entrances. Combining different sources is the most versatile means of controlling the translocation of genetic materials in highly confined spaces.
한민섭 한국사립대학교 도서관협의회 2010 사대도협회지 Vol.11 No.-
이 논문은 영·정조대의 국가 편찬사업에서 핵심적인 실무자로 활동하고 학문적으로 거의 전 분야에 걸쳐 박학하였던 서명응이 자신의 저술을 수정하는 과정과 叢書로 편찬하는 과정 및 그 특징과 각 저술이 편입된 서명응 총서의 특징들에 대해서도 집중 조명함으로써 서명응 학문 특징 및 당대 지성사의 한 국면을 파악하고자 하였다. 그 결과 서명응의 저작 중에는 전집, 총서의 형식을 가지는 것들이 많으며, 저술의 한 특징은 대부분의 저술에서 재편 작업을 거치고 있다는 점으로, 한 저작이 수정을 거쳐 총서로 편입되는 현상이 나타나는 것을 확인할 수 있었다.
Evaporation and disjoining pressure of ultrathin film on substrate: a molecular dynamics study
한민섭 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.8
The equilibrium evaporation of the thin liquid film on a solid substrate is studied by performing molecular dynamics simulation (MD). The evaporation properties are obtained for a simple atomic system in three-phase coexistence and compared with those of the modeling methods based on the disjoining pressure. The thickness of the film is varied and goes down to as small as a few molecular diameters. The MD results show that the evaporation rate of the ultrathin film on a high-energy substrate is smaller than that of a macroscopic film because of the solid molecular potential effective over the film. The comparison with the mean field theory based on the kinetic theory of gases and the classical Hamaker theory of disjoining pressure shows a sizable discrepancy when the film thickness is comparable to the size of the interfacial region. The discrepancy mostly disappears when the disjoining pressure is derived by using the static properties from MD. This indicates that the evaporation modeling on ultrathin film of which the disjoining pressure is an integral part critically requires an accurate representation of the property.