A hermetically packaged G-switch includes a MEMS structure having a bottom substrate layer, a top device layer and an intermediate oxide layer. The knowledge and information on the general feature relating to the target-object, the observing method and the countermeasure method are prepared in the storing unit of the monitoring apparatus. The interface gel comprises, for example, a silicone based composite filled with aluminum oxide microspheres. The laser beam incident on the nanowires forms surface plasmon resonance, a near field having an intensity enhanced more than an intensity of the laser beam is formed by the surface plasmon resonance, and the positive ions are emitted from the thin film for generating positive ions by the near field. The ejector has a drive gear so that actuation of the drive gear imparts rotation to the toothed thread so as to rotate the plunger within the screw thread of the housing to eject ink from a bellows-like reservoir.