A damper device includes a damper unit arranged on a motive power transmission path between a motive power source and a gear mechanism and configured for absorbing torque fluctuations that might be generated by elastic force between the motive power source and the gear mechanism. The technique uses a codebook approach that is efficient in search complexity to look-up best motion filter set from a pre-calculated codebook of motion filter coefficient set. The laser light is scanned across the infected area for a predetermined duration. The method further includes initiating a second handshake process between the authenticator and the second device seeking authentication. A control mechanism controls based on detection information of the detecting mechanisms. Electrically conductive material may be formed over the chalcogenide material.