A system for providing security in a computing network. The tool can include a first sheet-like supporting member disposed on one side of the membranous tissue in a wet state, and a second sheet-like supporting member disposed on the other side of the membranous tissue in a wet state. Other embodiments are described and claimed. In operation, while the first and second base materials are fed by and between the presser foot and feed dog member, the first and second strips of sealing materials are simultaneously fed together with the first and second base materials, while being precisely guided by the respective first and second guide through-holes for sewing with the respective first and second base materials. Therefore, the torque of the alternator is controlled such that an energy deviation between the target trajectory and the engine rotation behavior becomes zero at the position preceding the reference point by the predetermined crank angle.