초록(영문) 
             For the development of customized private medication and on site medical diagnosis, various techniques for cell separation have been 
developed. In particular, a technique using an acoustic wave capable of separating a cell in a short time without adversely affecting the 
cell is attracting attention. However, in the conventional technique, nodes of stationary waves are fixed, so that various kinds of particles 
are gathered at the nodes, and it is impossible to individually move the particles according to kinds. In this study, we tried to develop a 
technique to separate polystyrene particles and cells with different sizes at once by controlling the nodes. The position of the node changes 
according to the phase change of the standing acoustic wave. When the phase modulation rate was 300 mHz, it was possible to separate 
a mixture of 6-uM, and 15uM polystyrene beads completely. When the phase modulation rate was 50 mHz, it was possible to separate 
adipose-derived stem cells from the mixture of neural stem cells and adipose-derived stem cells. We expect that from this research and 
with further development, we will be able to categorize, and separate specific cells of different types. using this technique, we expect the 
development of mobile devices that can sort cells with high speed and accuracy, and can be used for immediate medical diagnosis.