Abstract: An olefin-based polymer, a film prepared from the olefin-based polymer, and preparation methods for manufacturing the olefin-based polymer and the film are disclosed. The olefin-based polymer has excellent processability, and a film prepared from the olefin-based polymer, particularly, a linear low density polyethylene film has excellent mechanical strength, in particular, drop impact strength.

Abstract: A vehicle seat reinforcement device includes a leg portion mounted on a floor panel, a seat cushion frame slidably mounted on the leg portion, and a load reinforcing structure connected between the leg portion and the seat cushion frame, wherein when a seat belt anchorage load is transferred to the seat cushion frame, the seat cushion frame is locked to the leg portion by the load reinforcing structure.

Abstract: An ozone asher includes: a chamber having a closed space isolated from an atmosphere, and an opening through which the semiconductor substrate to be etched is inserted and withdrawn from the chamber; an upper cover forming an upper portion of the chamber, having ozone injection holes for supplying ozone into the chamber; a plurality of holders for holding the semiconductor substrate inserted in the chamber through the opening; a pedestal provided to be raised and lowered in the chamber and supporting the semiconductor substrate during the whole procedure; vacuum means provided at the pedestal for drawing and holding the semiconductor substrate to the pedestal; heating means for the semiconductor substrate provided at the pedestal; means for raising and lowering the pedestal and the heating means; means for keeping a gap between the pedestal and the upper cover during the elevating of the semiconductor substrate; and a slit door for opening and closing the opening of the chamber selectively.