A tamper detection mechanism for detecting tampering when a sub system is removed from a host device may include a screw member that may include a head portion, a major diameter shaft portion and a minor diameter shaft portion. The container includes at least one flange segment having a front and a back face. If the set of definitions is related to an object to be found, the set of definitions of the object found is applied to the object which was used as the basis for defining the set of conditions for similarity. The synthesizing unit synthesizes a synthesized audio signal on the basis of the linear predictive residual signal. When the control deviation exceeds the set value, a traveling target is regenerated, such that traveling control appropriate for the traveling environment can be performed. In an alternative embodiment, the cracked portion of the metal skin is removed and a metal patch is attached to the doubler such that the patch replaces the removed metal skin.