Abstract: Disclosure provides a two-segment electromagnet stirring member, and a two-segment electromagnet semi-solid die-casting apparatus including the same, and a die-casting method using the same. The two-segment electromagnet stirring member includes a plurality of magnetic field generation parts therein, and includes a first electromagnetic stirring part and a second electromagnetic stirring part separated from each other. The first electromagnetic stirring part and the second electromagnetic stirring part are coupled to each other in a ring shape to surround an outer circumferential surface of a sleeve to perform electromagnetic stirring to molten metal in the sleeve, and are coupled to each other so as to position the plurality of magnetic field generation parts at radially equal gaps around the sleeve.

Abstract: A guard cable for a road, includes a plurality of wire ropes extending in a horizontal direction with respect to a plurality of supports provided on the side of the road at intervals. The wire ropes are shifted to a predetermined width from the supports to the roadway by a wire rope protrusion installation unit. The plurality of wire ropes provided between the supports are maintained at constant intervals by an interval maintenance plate.

Abstract: The present invention relates to a guard cable for a road, and more specifically, to a guard cable for a road, wherein a plurality of wire ropes are provided in the horizontal direction with respect to a plurality of supports provided on the side of the road at intervals, and are shifted to a predetermined width from the supports to the roadway by a wire rope protrusion installation unit, and the plurality of wire ropes provided between the supports are maintained at constant intervals by an interval maintenance plate to minimize the concentration of loads on only one or more wire ropes among the plurality of wire ropes when a vehicle hits the guard cable, and to minimize the falling of the vehicle toward the outside of the road of the guard cable when the vehicle hits the guard cable.

Abstract: A method of and an apparatus to improve stability and efficiency during data transmission performed over a wireless network includes transmitting a first data frame containing a plurality of data units to a receiving device, receiving from the receiving device a receipt of confirmation for each data unit received by the receiving device, and transmitting a second data frame containing at least one of the plurality of data units that have not been transmitted or received, according to the receipt of confirmation for each data unit received by the receiving device.

Abstract: Apparatuses and methods are provided for transmitting and receiving uncompressed audio or video (AV) data by applying a different coding rate to each bit or each group of bits included in the uncompressed AV data according to significance of each bit or each group of bits. The apparatus for transmitting the uncompressed AV data includes a grouping unit which classifies bits of each pixel included in the uncompressed AV data into at least two groups of bits according to a significance of the bits; an encoding unit which performs error correction encoding on each of the at least two groups using a different coding rate; and a radio frequency (RF) processing unit which transmits the encoded, uncompressed AV data, which includes the pixels on which the error-correction encoding was performed, using a communication channel.

Abstract: A method and apparatus for reducing the power consumption of a wireless LAN device that operates in a wireless network are disclosed. The method for reducing the power consumption includes receiving a high throughput (HT) frame; judging whether the received HT frame is decodable; and if the received HT frame is not decodable, switching the wireless LAN device into a standby mode, and maintaining the device in the standby mode for a duration of the HT frame.

Abstract: A transceiver device capable of calibration, and a calibration method used by the transceiver device. The transceiver device includes a reference transceiver, a plurality of remaining transceivers, and a plurality of transmission calibration paths connecting the remaining transceivers to the reference transceiver for transmission calibration of the remaining transceivers. An envelope detector included in the reference transceiver is shared with the remaining transceivers. When implementing a multiple input multiple output (MIMO) transceiver in a single chip, the chip size and manufacturing cost of the MIMO transceiver device can be substantially reduced.

Abstract: A receiver implemented without using a phase locked loop frequency synthesizer and a receiving method of a receiver implemented without using a phase locked loop frequency synthesizer are provided. The receiver includes a radio frequency (RF) receiving unit; a band-selecting unit; an RF amplifier; a local oscillation (LO) signal generator; a mixer; an IF amplifier; an analog to digital (A/D) converter; and a channel-selecting unit. The method includes passing a frequency band of a radio frequency (RF) signal received by an RF receiving unit; amplifying the passed RF signal; generating a local oscillation (LO) signal having a fixed frequency; mixing the LO signal with the amplified RF signal to lower the frequency of the amplified RF signal; outputting an intermediate frequency (IF) signal; amplifying the IF signal; converting the amplified IF signal into a digital signal; and selectively passing frequencies of the digital signal corresponding to a specific channel.

Abstract: A road guardrail having an impact buffering bracket between a waveform shape plate and a guardrail plate is disposed, in which an impact buffering bracket formed of a metallic plate is divided into a front bracket and a rear bracket, and the front and rear brackets are elastically engaged in forward and backward directions. When a vehicle collides with a guardrail plate, the engaged front and rear brackets are flexibly contracted for thereby releasing impact force, and in another embodiment of the present invention, an impact buffering bracket is formed in a rectangular tube shape, and a weak portion having a plurality of holes at both sides is formed. When a vehicle collides with a guardrail, the weak portion formed at the lateral sides is flexibly contracted for thereby releasing n impact force.

Abstract: A falling rock preventing fence assembled with a steel net is disclosed, in which a plurality of support members are provided in a pipe shape having a rectangular grooves in upper and lower longitudinal directions, with the support member being installed on the ground at regular intervals, and both ends of the steel net formed in a rectangular plate shape are inserted into the rectangular grooves of the neighboring support member and are fixed using a fixture such as a bolt, etc., and the upper and lower portions of the steel nets stacked in the upper and lower direction are connected with a connection member such as a bolt, etc., and the strength of the steel net is enhanced by the rectangular grooves longitudinally formed in the support member and the end of the steel net inserted in the rectangular groove.

Abstract: A guidepost of a road is disclosed, in which there are provided a groove pipe frame having an insertion groove along an entire length of a circular pipe and a guidepost having an insertion frame inserted into the insertion groove and provided at a backside of a guidepost having various road and traffic information, and the insertion groove of the groove pipe frame and the insertion frame of the guidepost are assembled based on an insertion method, and a rim reinforcing angle is provided for reinforcing the guidepost made of an aluminum plate at an outer side of a backside of the guidepost, and a T-shaped space portion is formed at the insertion frame, with an upper side of the same being opened, and the insertion frame and the guidepost are assembled based on a sliding and insertion method for thereby achieving a simple and easily assembling work in a state that it is loosely installed at the insertion groove of the groove pipe frame using a fixing bolt.

Abstract: An apparatus and method are provided for transmitting and receiving wireless data and a method of transmitting and receiving wireless data in which a frame is transmitted via one of a plurality of channels, a response frame is received via another of the channels in return for the frame, the receive sensitivity for the frame is determined based on the response frame, and a set of TXVECTOR parameters are controlled according to the determination. The apparatus includes a media access control (MAC) unit which generates a data frame, a first physical (PHY) unit which transmits a wireless signal of the data frame via a first channel, a second PHY unit which receives a control frame comprising a receive sensitivity for the wireless signal via a second channel, and a parameter control unit which adjusts a set of TXVECTOR parameters for the data frame via the first channel based on the control frame.

Abstract: Provided is a method of searching for a wireless communication device. The method includes outputting a search signal in multiple output directions; and if a response signal for the search signal is received, mapping an identifier of a wireless communication device having transmitted the response signal and information about an output direction of the search signal.

Abstract: Apparatuses and methods are provided for transmitting and receiving uncompressed audio or video (AV) data by applying a different coding rate to each bit or each group of bits included in the uncompressed AV data according to significance of each bit or each group of bits. The apparatus for transmitting the uncompressed AV data includes a grouping unit which classifies bits of each pixel included in the uncompressed AV data into at least two groups of bits according to a significance of the bits; an encoding unit which performs error correction encoding on each of the at least two groups using a different coding rate; and a radio frequency (RF) processing unit which transmits the encoded, uncompressed AV data, which includes the pixels on which the error-correction encoding was performed, using a communication channel.

Abstract: A method of and an apparatus to improve stability and efficiency during data transmission performed over a wireless network includes transmitting a first data frame containing a plurality of data units to a receiving device, receiving from the receiving device a receipt of confirmation for each data unit received by the receiving device, and transmitting a second data frame containing at least one of the plurality of data units that have not been transmitted or received, according to the receipt of confirmation for each data unit received by the receiving device.

Abstract: A receiver implemented without using a phase locked loop frequency synthesizer and a receiving method of a receiver implemented without using a phase locked loop frequency synthesizer are provided. The receiver includes a radio frequency (RF) receiving unit; a band-selecting unit; an RF amplifier; a low oscillation (LO) signal generator; a mixer; an IF amplifier; an analog to digital (A/D) converter; and a channel-selecting unit. The method includes passing a frequency band of a radio frequency (RF) signal received by an RF receiving unit; amplifying the passed RF signal; generating a low oscillation (LO) signal having a fixed frequency; mixing the LO signal with the amplified RF signal to lower the frequency of the amplified RF signal; outputting an intermediate frequency (IF) signal; amplifying the IF signal; converting the amplified IF signal into a digital signal; and selectively passing frequencies of the digital signal corresponding to a specific channel.

Abstract: A method and apparatus for reducing the power consumption of a wireless LAN device that operates in a wireless network are disclosed. The method for reducing the power consumption includes receiving a high throughput (HT) frame; judging whether the received HT frame is decodable; and if the received HT frame is not decodable, switching the wireless LAN device into a standby mode, and maintaining the device in the standby mode for a duration of the HT frame.

Abstract: A transceiver device capable of calibration, and a calibration method used by the transceiver device. The transceiver device includes a reference transceiver, a plurality of remaining transceivers, and a plurality of transmission calibration paths connecting the remaining transceivers to the reference transceiver for transmission calibration of the remaining transceivers. An envelope detector included in the reference transceiver is shared with the remaining transceivers. When implementing a multiple input multiple output (MIMO) transceiver in a single chip, the chip size and manufacturing cost of the MIMO transceiver device can be substantially reduced.