Disclosed is a method and apparatus for transmitting uplink data by a terminal performing a DRX operation in a mobile telecommunication system. The single-chip image capture sensor captures a frame including a first set of pixel data and a second set of pixel data. The cement slurry includes an expansive agent and latex to increase the shear-bond between the downhole pipe and the cement plug. The bottom surface is connected with the light incident surface and disposed opposite the light-emitting surface. Each cam element has a cam portion which is engageable through an opening in a keeper to latchingly engage behind a cam engagement surface associated with the opening.