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My main research subject is the partial differential equations of hypersurfaces such as the minimal surface equations and the mean curvature flow equations derived from the physical phenomena such as the shape of the soap film and the movement of the metallic grain boundary during metal annealing. Soap bubbles cause various geometric changes such as overlapping, tearing and vanishing, but it is extremely difficult to handle those physical phenomena mathematically. I am trying to analyze those phenomena by using the Phase Field method and the geometric measure theory.