摘要:
There is provided a method for placing reference signals in a wireless communication system. The method includes preparing a plurality of sub-frames for a plurality of antennas, placing a reference signal for one sub-frame and placing a reference signal for another sub-frame not to overlap with the reference signal for one sub-frame, wherein the reference signal for one sub-frame and the reference signal for another sub-frame are successively placed on contiguous OFDM symbols or on the contiguous sub-carriers. Channel estimation or data demodulation can be prevented from performance degradation.
摘要:
Provided is a power control method for a mobile Radio Frequency Identification (RFID) reader and an RFID reader using the same. The RFID reader includes: an RFID reader transmission/reception control unit for creating a message to be transmitted to an RFID tag and transmitting RFID tag information to a terminal control unit; a reader transmitting unit for encoding and modulating the created message; a power amplifier for amplifying an output signal; a reader receiving unit for demodulating and decoding the signal and transmitting the signal to the RFID reader transmission/reception control unit; and an RFID reader power control unit for controlling power, wherein when the RFID reader transmission/reception control unit receives a command for acquiring the RFID tag information, the RFID reader power control unit applies power to the power amplifier.
摘要:
A graphic data file containing instructions for displaying graphic data on a display device, the graphic data file having a header identifying the start of the graphic data file, a plurality of portions of instruction data following the header and each portion of instruction data having an instruction for controlling the graphic data of a predetermined size to be displayed and frame information to determine an order and a period of time for displaying the graphic data. A method for generating independent graphic data files including instructions for controlling a process of the graphic data files to be displayed on a display device, and to a corresponding medium and a player. The inventive method comprises the steps of: generating a header containing the information for identifying the start of the graphic data file; generating a plurality of instruction data following the header, each of the instruction data comprising one instruction for controlling the graphic data file of a predetermined size to be displayed on the display device and frame information for determining the order and a period of time of the instruction to be displayed; and generating a tail containing the information for identifying the end of the graphic data file following the plurality of instruction data.
摘要:
A photonic integrated device using a reverse-mesa structure and a method for fabricating the same are disclosed. The photonic integrated device includes a first conductive substrate on which a semiconductor laser, an optical modulator, a semiconductor optical amplifier, and a photo detector are integrated, a first conductive clad layer and an active layer sequentially formed on the first conductive substrate in the form of a mesa structure, a second conductive clad layer formed on the active layer in the form of a reverse-mesa structure, an ohmic contact layer formed on the second clad layer in such a manner that the ohmic contact layer has a width narrower than the width of an upper surface of the second conductive clad layer, a current shielding layer filled in a sidewall having a mesa and reverse-mesa structure, and at least one window area formed between the above elements.
摘要:
A method for printing images on a voluntary template paper is disclosed. The method comprises the steps of a) scanning a paper having a predetermined template layout, b) selecting a predetermined image, c) arranging the selected image on the scanned template, and d) printing the template with the arranged image on the paper. Accordingly, images and text can be arranged in a template which is not provided by the application or which is designed by the user, and the arranged images and text with the template can be printed on the paper.
摘要:
Disclosed is a deflection yoke to improve screen quality, including a coiling density adjustment groove formed along a vertical direction of a coil by way of increasing the coiling density at an arbitrary portion of the electric field at the internal side of the deflection coil. To this end, a winding frame is provided for winding coil around the deflection yoke, having a curvature of a designated shape at the center, in which the winding frame includes a wire position guide that projects as much as a designated width to a vertical direction of a coil to be wound around an arbitrary portion of the internal electric field for increasing a coiling density.
摘要:
A variable capacity rotary compressor, which is designed to make an internal pressure of a compression chamber, where an idle rotation is executed, be equal to an outlet side pressure of the rotary compressor, thus minimizing a rotating resistance. The compressor includes a housing partitioned into two compression chambers having different capacities by a partition plate. A rotating shaft rotates in the compression chambers. Two eccentric units are mounted to the rotating shaft to be placed in the compression chambers, and execute a compression rotation and an idle rotation according to a rotating direction of the rotating shaft. A pressure control unit functions to apply the pressure of the outlet side of the compressor to the compression chamber which executes the idle rotation. The pressure control unit includes a path control channel which is vertically provided through the partition plate to be placed at a position outside the compression chambers. Two valve seats are seated in opposite ends of the path control channel. A valve member is movably set in the path control channel. A communicating path is provided through the partition plate to make the outlet side communicate with the path control channel. Two inlet channels are provided at predetermined positions of the housing to make the path control channel communicate with the compression chambers.