An unmanned vehicle for use in a stable such as a cowshed is provided with detection components for determining meteorological conditions. The handoff is assisted with a wireless router which is the first hop from the mobile station to the new access point. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHD90 through backcross conversion andor transformation, and to the maize seed, plant and plant part produced thereby. On top of the first crystal layer, a second thin layer of a different type of crystal is deposited, such as lithium fluoride or sodium fluoride. The magnetic head for writing data on a recording medium comprises: an upper magnetic pole including a pole section, which faces the recording medium and has a prescribed width; and a lower magnetic pole including grooves, which are respectively formed on the both sides of the pole section, wherein level of edges of the grooves are lower than that of an upper face of the lower magnetic pole. The method further includes forming a photo diode in the light receiving region.