Abstract: A semiconductor device includes a first element separation structure, a second element separation structure, and a third element separation structure sequentially disposed along a first direction and extending in a second direction intersecting the first direction; a first active pattern extending in the first direction between the first element separation structure and the second element separation structure; a second active pattern extending in the first direction between the second element separation structure and the third element separation structure and separated from the first active pattern by the second element separation structure; a first gate electrode extending in the second direction on the first active pattern; and a plurality of second gate electrodes extending in the second direction on the second active pattern, wherein a width of the first active pattern in the second direction is greater than a width of the second active pattern in the second direction.

Abstract: A steel for a gear includes, based on a total weight of the steel: C: 0.10-0.30 wt %, Si: 0.60-0.80 wt %, Mn: 0.25-0.75 wt %, Cr: 1.80-2.20 wt %, Ni: 0.50-1.50 wt %, Mo: 0.20-0.40 wt %, Nb: 0.025-0.050 wt %, V: 0.030-0.050 wt %, and a balance of Fe and inevitable impurities, wherein contents of Nb and V satisfy the following <Relationship Formula 1>: 0.055<[Nb]+[V]<0.100??<Relationship Formula 1>, wherein [Nb] represents a content of Nb and [V] represents a content of V.

Abstract: A transportation system of a cassette comprises a port and a system controller. The port accommodates a cassette carrying a glass substrate, and the port includes displacement sensors for sensing a position of a cassette. The system controller calculates a distortion amount of the cassette using sensed values of the cassette and determines if the cassette is in a normal settlement status by comparing the distortion amount with a tolerance value. Therefore, the position of the cassette can be automatically taught without clamping operation of a clamping device clamping the cassette disposed in the port, thereby preventing defects of the glass substrate by removing various defect-causing factors such as particles and static electricity that may occur during a conventional clamping operation. In particular, quality defects of OLED can be eliminated by preventing particles and static electricity that affect product quality defects in the OLED manufacturing process.