A flexible organic light-emitting display apparatus includes a flexible substrate, a barrier layer on the flexible substrate, a display portion on the barrier layer, an encapsulation layer covering the display portion, and a porous layer between the flexible substrate and the display portion. For example, the supplementary fuel may be supplied to facilitate starting and warming up a cold engine, or to cool andor slow down an engine operating above a threshold speed. Data items in the data set are sampled according to the baseline sample rate, to obtain a sample set. Also disclosed are methods of inhibiting farnesyl protein transferase and the growth of abnormal cells, such as tumor cells.