Abstract:
본 발명은 표면층의 상이 내부상과는 다른 상으로 이루어지는 구조를 가지는 표면이 개질된 α-β사이알론 복합체 및 그것을 제조하는 방법에 관한 것으로, 본 발명의 방법은 첨가제를 포함하는 β-사이알론 조성 또는 α-사이알론 조성의 혼합분말로 성형된 압분체를, 각각 첨가제를 포함하는 α-사이알론 조성 또는 β-사이알론 조성의 혼합분말의 혼합분말속에 넣고 소결하는 것으로 이루어진다.
Abstract:
The system improves transmission efficiency of information simplifying header. It comprises; the steps of; recording the relative address and next address on the call information table in calling up; transferring the previous address to next node by packet direction value and the call information table; making up the forward call information table; the step backward call information table; recognizing call information address of the traffic header for packet transfer; reading the address of the output nozzle number and the next node.
Abstract:
PURPOSE: An AC-DC converting apparatus and method using multi-level pulsating current and a selection switch are provided to obtain rectified wave form similar to reference DC voltage by selectively outputting pulsating current wave form. CONSTITUTION: A multi-level rectifier circuit part(320) changes AC voltage of different levels transformed by a multi-tap transformers into pulsating voltages of different levels through a plurality of rectifiers. A reference voltage generating circuit part(330) receives DC voltages supplied from a sub power circuit part and generates reference DC voltages. A multi-level comparator circuit part(340) compares the pulsating voltage with the reference DC voltages and outputs signals corresponding to the comparison results. A multi-level selection switch circuit part(350) selects the pulsating voltage most similar to the reference DC voltage using the signals outputted from the multi-level comparator circuit part.
Abstract:
A routing attack exclusion method using a reliability scoring system in an Ad Hoc network is provided to recognize a wrong node using a routing error signal and a claim check signal and exclude the wrong node in path assignment later, thereby configuring a stable Ad Hoc network system. A node(100) for an Ad Hoc network system comprises a data generation/relay unit(110), a reception checking unit(120), a claim reporting unit(130), a claim check/verification unit(140) and a reliability value processing unit(150). The data generation/relay unit generates, or relays and transmits data. The reception checking unit generates reception check signal when data transmitted from a different node is received as a final destination and transmits the reception check signal in a reverse direction. The claim reporting unit transmits an RERR(Routing Error) signal to a source node when the reception check signal is not received from a target node of a final destination during operation as a relay node, and reports a claim to the source node. The claim check/verification unit transmits a claim check signal to a relay node nearest to the target node, wherein a previous good node receiving the claim check signal transmits a claim verification signal to the target node. The reliability value processing unit recognizes a node of a next path as a wrong node when the claim check signal is received and excludes the node in path assignment later.
Abstract:
An O-CDMA(Orthogonal Code Division Multiple Access) system using a cyclic orthogonal sequence and a method thereof are provided to improve the BER(Bit Error Rate) performance of a mobile terminal by making another mobile terminal maintain an orthogonal characteristic so that interference noise can be cancelled by itself. An O-CDMA cyclic orthogonal sequence generation part(3) in an O-CDMA transmitting part comprises an initial value storage part(16), an m-sequence generator(18), a delay part(19), a reversion part(21) and a combiner(22). The initial value storage part(16) inputs an O-CDMA initial value to a plurality of registers(17). The m-sequence generator(18) generates an m-sequence. The delay part(19) delays the generated m-sequence by more than 1 chip. The reversion part(21) reverses the output signal of the delay part(19). The combiner(22) arithmetically combines the m-sequence with the delayed and reversed sequence and outputs an O-CDMA sequence.
Abstract:
A CDMA(Code Division Multiple Access) communication apparatus using a QO(Quasi Orthogonal) spreading sequence having a guard interval sequence and a system thereof are provided to decrease an inter-user mutual interference level at a baseband after despreading by using a QO spreading sequence, including a guard interval sequence, as a spreading code. A CDMA communication apparatus using a QO spreading sequence having a guard interval sequence comprises a baseband modulation part(10), a QO spreading sequence creation part(11), a spread spectrum part(12), a radio signal part(13), and an antenna part(14). The baseband modulation part(10) modulates a baseband signal and outputs a modulated baseband signal. The QO spreading sequence creation part(11) creates a QO spreading sequence and an integral interval signal. The spread spectrum part(12) multiplies the QO spreading sequence by the modulated baseband signal and outputs a spread spectrum signal. The radio signal part(13) loads a carrier with the spread spectrum signal and outputs a radio signal. The antenna part(14) transmits the radio signal by wireless.
Abstract:
PURPOSE: A spreading communication system using a partial response coder is provided to improve a processing gain by compressing a baseband at a minimum frequency bandwidth. CONSTITUTION: A transmitting part in a spreading communication system consists of a duo-binary coding unit(10) and a partial response coder(20). The duo-binary coding unit(10) receives input data(d(k)) and generates a duo-binary signal(VD(k)). The duo-binary coding unit(10) is composed of a preprocessing coding unit and an adder(14). The preprocessing coding unit includes a modulo-2 adder(11) and a time delay unit(12). The partial response coder(20), comprising an impulse generator(21) and a baseband spherical filter(22), generates a partial response signal(P(k)). The impulse generator(21) converts the duo-binary signal(VD(k)) into an impulse. The baseband spherical filter(22) filters the impulse.
Abstract:
본 발명은 전송정보의 2비트 에러를 검출하고, 1비트 에러를 정정할 수 있게 한 에러정정코드 작성방법에 관한 것으로, 전송정보의 2비트 에러검출 및 1비트 에러정정을 위해서는 각 코드워드간 해밍거리가 4인 완전 코드세트가 필요하게 된다. 이러한 점을 감안하여, 7비트의 최장부호열을 1비트씩 시프트하여 7개의 부호열을 만들고, 그 부호열 처음에 "0"비트를 각기 추가하여 코드길이가 8인 7개의 부호열을 만들며, 그 7개의 부호열에 "000000000"의 코드워드를 추가하여 8개의 코드워드를 만들고 그 8개 코드워드 각각의 정반대(Antipodal)값을 코드워드로 만들어 총 16개의 코드워드를 만들며, 상기 16개의 코드워드에 "AAH"값을 모듈-2 가산시켜 에러정정코드를 만듦으로써, 각 코드워드간 해밍거리가 4인 완전 에러정정코드가 되게 한 것이다.