Abstract: A dual band antenna unit for a mobile device may include an antenna receiving part, a first antenna part having a first contact point and a second contact point, a second antenna part, a first feed point and a second feed point. The second antenna part may be formed integrally with the first antenna part and may extend from the first antenna part. The second antenna part may be extractably and retractably mounted in the mobile device. The first antenna part and the second antenna part may have resonant frequencies of different frequency bands. When the second antenna part is extracted, the first contact point may contact the first feed point. When the second antenna part is retracted, the second contact point may contact the second feed point. The mobile device may operate in different frequency bands using a single antenna unit, thereby allowing freedom of internal design and meeting the demand for miniaturization.

Abstract: An assistant ceiling device designed to shield an escape hatch installed to a ceiling of an elevator cab. The assistant ceiling device comprises two elongated rail (10) and a rectangular assistant ceiling plate (20). Each guide (10) is installed at either side of the emergency escape hatch (1), and has a length longer than that of the emergency escape hatch and shorter than that of the ceiling of the elevator cab. The assistant ceiling plate (20) is laid on the rail guides (10) to shield the emergency escape hatch (1). Each guide (10) has a latching jaw (12) so as to allow the assistant ceiling plate (20) to be installed to the rail guides (10) by laying both opposite sides of the ceiling plate on the latching jaws (12). Each guide (20) is formed, at an upper end, with a slot through which a heat of a bolt cannot pass, and with a guide recess (18) through which the head of the bolt can freely move.

Abstract: Disclosed herein is a semiconductor package board, in which a copper pattern having a predetermined shape is formed on a dummy area, thus preventing the entire semiconductor package board from bending. The present invention is technically characterized in that the copper pattern includes a beam part, which is provided in the longitudinal direction of the semiconductor package board, and a rib part, which is provided in the lateral direction of the semiconductor package board.

Abstract: A scalable encoding method accurately performs the decimation of a low-resolution frame from a high-resolution frame by compensating for the energy of the low-resolution image in consideration of the rate of the total energy of high-resolution to the partial energy of a corresponding block to be decimated, alleviating the drift effect and enabling good video recovery.

Abstract: A scalable encoding apparatus and method accurately performs motion vector scaling in interframe coding so that an optimal weight having the best S/N ratio is applied, eliminating the drift effect on the image and enabling good video recovery.

Abstract: A decoder having an adaptive function of eliminating block effect in consideration of the contents of an image includes a buffer for storing a compressed signal coming at a fixed bit rate; a variable length decoder (VLD) for variable length decoding an output signal of the buffer to thereby output a motion vector signal and a quantized signal of spatial frequency; an 8*8 reverse quantizer for reversely quantizing the quantized signal of spatial frequency; a block effect deciding portion for determining whether there is a need for spatial frequency presumption or not; a border detector for deciding the border of object in a spatial frequency area; an adaptive low spatial frequency predictor for adaptively presuming the spatial frequency component, whether the current block is present at the border of object; an 8*8 reverse DCT transformer for converting a spatial frequency signal into a signal of pixel area; a motion compensator for compensating for motion using a motion vector signal; and a frame memory for s