Abstract: An embodiment of the present specification provides a method for preparing a catalyst for preparing a carbon nanotube, comprising: (a) dissolving a main catalyst precursor, a support precursor, a cocatalyst precursor and a precipitation inhibitor in a solvent to prepare a precursor solution; and (b) pyrolyzing the precursor solution by spraying the precursor solution into a reactor, wherein a mole fraction of the precipitation inhibitor to the cocatalyst precursor is 0.1 to 1.5.

Abstract: The present invention relates to a support pole assembly for mounting an antenna and, particularly, to a support pole assembly for mounting an antenna, comprising: a support pole which is formed in a hollow structure and has an antenna device mounting hole formed at the circumferential surface thereof; an antenna device which is mounted to the support pole while passing through and covering the antenna device mounting hole and the rear portion of which is placed in the inner space of the support pole. Accordingly, the present invention provides an advantage in that the protrusion amount of the antenna device with respect to the support pole is reduced and thus the space required for mounting the antenna device can be reduced.

Abstract: A wireless communication device support assembly is disclosed, including a support pole comprising a hollow interior, a first frame having a polygonal shape disposed on top of the support pole, a plurality of wireless communication devices disposed inside the first frame, at least one or more rotational advertising apparatuses controllably elevated in a direction parallel to a longitudinal direction of the support pole, a drive unit configured to elevate or lower the rotational advertising apparatus, and a plurality of lift ropes having first ends connected with tops of the rotational advertising apparatuses and second ends connected with the drive unit.

Abstract: The present invention relates to a clamping apparatus for an antenna device, and particularly, to a clamping apparatus including a rotation unit configured to rotate an antenna device in a horizontal direction, a tilting unit configured to rotate the antenna device in a vertical direction, and a connection arm configured to install at least one of the rotation unit and the tilting unit on a support pole so that the support pole is not positioned on a horizontal rotation path and a vertical rotation path of the antenna device, thereby reducing an installation space for an antenna device with respect to the support pole.

Abstract: A method and apparatus for intra-prediction coding of video data are provided. The apparatus includes a decoder that is configured to decode, from a bitstream, a syntax element indicating an intra-prediction type of a current block of the video data, and an intra-predictor that is configured to generate a prediction block for the current block by selectively performing matrix based intra-prediction or regular intra-prediction based on the intra-prediction type of the current block indicated by the syntax element.

Abstract: A method and apparatus for intra-prediction coding of video data are provided. The apparatus includes a decoder that is configured to decode, from a bitstream, a syntax element indicating an intra-prediction type of a current block of the video data, and an intra-predictor that is configured to generate a prediction block for the current block by selectively performing matrix based intra-prediction or regular intra-prediction based on the intra-prediction type of the current block indicated by the syntax element.

Abstract: A distributed antenna system supporting MIMO service is disclosed. Some embodiments provide a distributed antenna system supporting MIMO communication, including first node, second node and one transmission line. The first node receives MIMO downlink signals of a plurality of MIMO services each including N (a natural number of 2 or more) MIMO downlink signals, and performs, for each MIMO service, frequency-conversion of N?1 MIMO downlink signals among the N MIMO downlink signals, to different frequency band from original frequency band, to generate N MIMO downlink signals without mutually overlapping frequency bands. The second node performs, for each MIMO service, frequency-conversion of the MIMO downlink signals having been frequency-converted by first node, in a complementary manner, to reconstruct the MIMO downlink signals of original frequency band. The single transmission line is used between the first node and second node for transmitting N downlink signals without mutually overlapping frequency bands.

Abstract: A distributed antenna system supporting MIMO service is disclosed. Some embodiments provide a distributed antenna system supporting MIMO communication, including first node, second node and one transmission line. The first node receives MIMO downlink signals of a plurality of MIMO services each including N (a natural number of 2 or more) MIMO downlink signals, and performs, for each MIMO service, frequency-conversion of N?1 MIMO downlink signals among the N MIMO downlink signals, to different frequency band from original frequency band, to generate N MIMO downlink signals without mutually overlapping frequency bands. The second node performs, for each MIMO service, frequency-conversion of the MIMO downlink signals having been frequency-converted by first node, in a complementary manner, to reconstruct the MIMO downlink signals of original frequency band. The single transmission line is used between the first node and second node for transmitting N downlink signals without mutually overlapping frequency bands.

Abstract: A remote radio head is provided. The remote radio head includes at least one integrated connection terminal for integrating and receiving at least one optical signal with at least one power source, a power supply unit which receives and supplies the power source by converting into an internal driving power source of a corresponding remote radio head, a photoelectric/electrooptic conversion unit for receiving and converting the optical signal into an electric signal, a framer for restoring the electric signal converted in the photoelectric/electrooptic conversion unit according to a preset signal demodulation format, a digital signal processing unit receives a signal outputted from the framer to adjust a waveform and a level in a digital level and a transmission and reception signal conversion module which converts a signal into a high-frequency transmission wireless signal, and amplifies the signal at a high power to output the signal to an antenna side.

Abstract: The present invention provides a remote radio head comprising: at least one integrated connection terminal for integrating at least one optical signal with at least one power source so as to receive the integrated optical signal and power source; a power supply unit which receives the power source from the integrated connection terminal, and which supplies the power source by converting into an internal driving power source of a corresponding remote radio head; a photoelectric/electrooptic conversion unit for receiving the optical signal from the integrated connection terminal so as to convert the optical signal into an electric signal; a framer for restoring the electric signal converted in the photoelectric/electrooptic convension unit according to a preset signal demodulation format; a digital signal processing unit for receiving a signal outputted from the framer so as to adjust a waveform and a level in a digital level; and a transmission and reception signal conversion module which converts a signal out