Embodiments of the present invention include systems and methods for creating customized activities. The rotary plunger has an on position and a tripped position. Further, the loading effect andor fogging effect can be easily calculated because the above-described method can be realized as a computer program and the computer program can be included in an exposure tool, thereby enabling exposure based on a corrected value. An improved computer system and a machine-accessible medium are also described. The rotation phase is set at a middle position between a maximum retard position and a maximum advance position when the movable portion is located at the beginning.