A lightweight, foldable device for the partial weight bearing during walking and gait training is provided. This process is characterized by maturation steps and physical steps which optimize recovery of measured growth factors and their ability to entice a response on human cells. The sealing module can be attached to, or detached from, the seat. The address decoder selects a bit line and a word line. Through the solution provided by the present invention, the cleaning robot can make an active recognition to the dirt such as dust, so that it can get into the working area accurately and rapidly. The interpolation of the generated in-phase and out-of-phase filtered outputs in the video scaler may be implemented by utilizing a Farrow structure.