Abstract: A semiconductor device may include a substrate, a first nanowire, a second nanowire, a first gate insulating layer, a second gate insulating layer, a first metal layer and a second metal layer. The first gate insulating layer may be along a periphery of the first nanowire. The second gate insulating layer may be along a periphery of the second nanowire. The first metal layer may be on a top surface of the first gate insulating layer along the periphery of the first nanowire. The first metal layer may have a first crystal grain size. The second metal layer may be on a top surface of the second gate insulating layer along the periphery of the second nanowire. The second metal layer may have a second crystal grain size different from the first crystal grain size.

Abstract: The present invention pertains to an elevator landing door system having a fire prevention device that prevents flame or smoke from penetrating into a shaft (60) from a landing and being spread throughout the entire building by blocking the gap between door panels (11, 11?) when a fire breaks out in a building. The elevator landing door system having a fire prevention device consists of door panels (11, 11?) that are opened and closed; a fire prevention plate (40) that extends alongside the opening and closing edge surface (11b) of one door panel (11) on the side (11b) facing the elevator, equipped with a downward slot (42) inclined toward the opening and closing edge of the door panel, and fixed to the door panel by a fastening means (46) penetrating through the slot; and fixtures (44) made of a fusible material that are tightly attached together with the door panel and the fire prevention plate by the fastening means.