A novel carnosic acid derivative for promoting the synthesis of nerve growth factor, a composition comprising the carnosic acid derivative as an effective ingredient, as well as, a method of promoting the synthesis of NGF comprising administering an effective amount of the carnosic acid derivative as an effective ingredient to a subject requiring such promotion. The apparatus comprises a frame member having each of a first predetermined shape and a first predetermined size and formed of a first predetermined material. A lithography process is simulated to create a virtual wafer pattern based on the deconvolution pattern. A sensing unit is provided to sense whether the battery pack is rotated. Once these safety checks are complete, the battery voltage signal can be regulated.