A method for testing the effect of a skin care product includes measuring a mechanical property of skin tissue using nonlinear stochastic system identification, applying the product to the skin, repeating the measurement of the mechanical property after the application of the product, and comparing the before and after measurements to quantify the effect of the product. In one implementation, SUM signal data is recorded within a SUM table. The controller determines a direction and a velocity in which the focus lens is moved toward an in-focus position on the basis of the information corresponding to the object distance in the focus lens control according to the focus-effect function. The transfer may be an anonymous transfer or it may be an identity-based transfer. ACW can be effectively applied in cancer immunotherapy. The mobile platform acquires a three-dimensional image using a time-of-flight sensor, removes a floor plane from the acquired 3D image using a random sample consensus algorithm, and individually separates objects from the 3D image.