The MY-Cube project aims at fabricating a 3D cube composed of a stack of 1T1R structures, and to perform logic operations inside. this could allow for a drastic reduction of power consumption of integrated circuits. A first part of this internship is dedicated to the analysis of TCAD simulations of the employed access transistor, the JunctionLess Transistor. The transistor physics was explained, the influence of the parameters over the performances investigated, and different conditions for which the transistor meets the requirements of an access transistor determined. A second part is dedicated to the SPICE simulation of circuits performing In-Memory Computing operations.