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〈논문〉 : 세포와 흡착면간의 영향을 고려한 흡착형 세포의 3 차원 동적 해석 모델 개발
송지환(Jihwan Song),김동철(Dongchoul Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The interaction between the cell and the substrate is the most prominent feature on the migration of crawling cell. This paper proposes a three-dimensional dynamic model under the diffuse interface description to reveal an effect of interaction between the single crawling cell and the substrate during chemotactic migration, which confirms the high possibility of adequate predictions. To illustrate the effects of interaction between the cell and the substrate, we consider the interfacial energy related with the coexistent material. Multiple mechanisms including interface energy, chemotaxis effect and diffusion are addressed by employing a diffuse interface model.
세포와 흡착면간의 영향을 고려한 흡착형 세포의 3 차원 동적 해석 모델 개발
송지환(Jihwan Song),김동철(Dongchoul Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.11
흡착형 세포의 이동에 있어 세포와 바닥면간의 상호작용은 매우 중요한 역할을 한다. 본 논문은 주화성에 의한 흡착형 세포의 이동에 있어 세포와 바닥면과의 상호작용에 따른 영향을 보이기 위해 확산계면모델을 바탕으로 한 3 차원의 입체 모델을 제안한다. 세포와 바닥면간의 영향을 표현하기 위해 세포 주위 물질과의 관계를 고려한 경계에너지를 고려하였다. 본 연구에서 적용한 확산계면모델은 경계에너지, 주화성, 확산성을 모두 고려한 다중 메커니즘 모델로서 흡착형 세포이동의 역학적 특성을 정확히 예측하는데 있어 높은 신뢰성을 보일 것이라 기대된다. The interaction between the cell and the substrate is the most prominent feature affecting the migration of a crawling cell. This paper proposes a three-dimensional dynamic model using the diffuse interface description that reveals the effects of the interaction between a single crawling cell and the substrate during chemotactic migration. To illustrate the effects of interaction between the cell and the substrate, we consider the interfacial energy between the coexistent materials. Multiple mechanisms including the interface energy, chemotaxis effect, and diffusion, are addressed by employing a diffuse interface model.
Simulation of self-assembled thin polymer films induced by an electrostatic field
송지환(Jihwan Song),김동철(Dongchoul Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
A thin polymer film subjected to an electrostatic field may lose stability at the polymer-air interface, leading to uniform self-organized pillars emerging out of the film surface. This paper presents a three dimensional dynamic model to account for the behavior. The coupled diffusion, viscous flow, and dielectric effect are incorporated into a phase field framework. Numerical simulations reveal rich dynamics of the pattern formation process and the substrate effect. The pillar size is insensitive to the film thickness, but the distance between pillars and the growth rate are significantly affected. The study suggests an approach to control structural formation in thin films with a designed electric field.
Phase field crystal 모델을 이용한 마이크로구조물의 멀티스케일 모델링
송지환(Jihwan Song),김동철(Dongchoul Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Computational modeling of micro- or nanostructure evolution is widely studied in materials engineering field. Phase field approach is a novel approach to simulate the various fields that characterize the micro- and nanostructures. Indeed, many phenomena related with the microstructure evolutions, such as a dendritic growth of materials and spinodal decomposition have been studied using phase field approach. However, the phase field approach has some limitations to model the natural properties arise from their crystalline phases because the phase field represents the fields that are spatially uniform in equilibrium. Recently, the phase field crystal method is proposed to overcome the limits. Moreover the PFC model can consider the phenomena on an atomic length scale and a diffusive time scale in contrast to molecular dynamics which is constrained to evolve at the scale of femtosecond. Here, we introduce the PFC in modeling of microstructure evolution and present a great potential of it.