Abstract: Disclosed are an apparatus and a method for reducing the coding complexity in an LDPC code used in a digital communication system. In the method, parameters required for coding are determined according to a coding rate and a code length, a seed matrix is generated according to values of the parameters, a plurality of cell matrices are generated according to the values of the parameters, a parity check matrix is generated using the seed matrix and the cell matrix, and information bits are coded from the parity check matrix. The method can be realized by a small memory and a simple shift register and can perform coding even without obtaining a generation matrix, thereby remarkably reducing the complexity of a system.

Abstract: A user certification apparatus includes a user certification unit performing user certification based on a combined result of avatar elements which is indicated as identification information for identifying each avatar element and position information for indicating a position of each avatar element on a combined avatar image. Accordingly, the user can more easily remember the certification information, and it is difficult for others to misappropriate the certification information.

Abstract: Provided is a method of compensating for energy loss and eliminating inter-symbol interference (ISI) and inter-chip interference (ISI) in wireless signals, and a rake receiver for wireless LANs adopting the same. The rake receiver compensates for energy loss of a CCK signal transmitted in a multi-path wireless channel environment and eliminates ISI and ICI from the received CCK signal because a DFE structure per chip used for calculating ICI components, is connected in parallel with a DFE structure per symbol, thus eliminating ISI and ICI components.

Abstract: Provided are an apparatus for and a method of inputting Korean vowels. The apparatus includes a gesture database that stores codes of Korean vowels corresponding to each gesture input by a user on a touch screen; a gesture confirmation unit that searches the gesture database and then selects and outputs corresponding codes of Korean vowels based on gestures that are input by the user on the touch screen. Accordingly, the user can more easily input Korean vowels.

Abstract: The present invention relates to a fungicidal composition which comprises N-(&agr;-cycno-2-thenyl)-4-ethyl-2-(ethylamino)-5-thiazolecarboxamide (ethaboxam) and as an adjuvant polyoxyalkylene alkyl ether.

Abstract: A channel equalizing and carrier recovery system for home phoneline networking alliance (HomePNA) receiver and method thereof are provided. The channel equalizing system includes a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer and a quadrature amplitude modulation (QAM) equalizer. The FD-QAM equalizer receives an FD-QAM signal, determines FD-QAM tap coefficients, and equalizes the FD-QAM signal using the FD-QAM tap coefficients. The QAM equalizer receives a QAM signal, determines QAM tap coefficients, and equalizes the QAM signal using the QAM tap coefficients. The QAM equalizer receives the FD-QAM signal and determines the QAM tap coefficients during a predetermined header period. The carrier recovery circuit includes a phase detector, a loop filter, and a numerically controlled oscillator (NCO).

Abstract: A receiver performing a stable operation in a burst mode is provided. The receiver transmits packet data using a preamble, and has good acquisition performance so that a synchronization part converges on a preamble interval. For the acquisition performance, the receiver senses the carrier of a received signal, detects a rough location of a burst, and in response to the result of carrier sensing, performs coarse gain control, symbol timing compensation, and frame synchronization. Then, if the frame synchronization is completed, in response to the result of frame synchronization, the receiver performs fine gain control, equalization of the signal, and carrier recovery.

Abstract: The present invention relates to a fungicidal composition which comprises N-(&agr;-cyano-2-thenyl,)4-ethyl-2-(ethylamino)-5-thiazolecarboxamide(ethaboxam) and as an adjuvant polyoxyalkylene alkyl ether.

Abstract: Coarse frequency offset estimation method and device in an orthogonal frequency division multiplexing (OFDM) receiver are provided.

Abstract: An OFDM receiving device for adjusting a beam formation azimuth through a plurality of antennas, a communication device using the same, and a method thereof.

Abstract: The present invention discloses a fast Fourier transform (FFT) processor using a high speed area-efficient algorithm. The FFT processor is embodied by using the algorithm including a radix-4 butterfly module for receiving four input signals, and performing a butterfly operation thereon, and a radix-2 butterfly module connected to the radix-4 butterfly module, for performing the butterfly operation on the output signals from the radix-4 butterfly module. As a result, a number of nontrivial complex multipliers is reduced, to perform the FFT in a high speed in a small area.

Abstract: A carbon--carbon composite for friction products comprises an outer friction part and a load bearing structure part supporting the friction part. The friction part contains a mixture of carbon fibers, pitch powder and graphite powder, whereas the structure part is comprised of a pack of alternating layers of the mixture and layers of one member selected from the group consisting of carbon fabrics, carbon-based prepregs and carbon-based, segmented prepregs.