Abstract:
PURPOSE: A space multiplexing transmission method and a device thereof are provided to equally control the reception range of a signal transmitted to each antenna. CONSTITUTION: R signals passed through a serial-parallel converter(410) are alternatively inputted to amplifiers(420,430) in every input time The signals are transmitted through antennas(440,450). R signals are inputted as an input signal to an amplifier connected to a first antenna, wherein the r signals are precoded with a transmission signal x to which a transmission power weight is alternatively applied. R signals are inputted as an input signal to an amplifier connected to a second antenna, wherein the r signals are precoded with a transmission signal x to which a transmission power weight is alternatively applied.
Abstract:
PURPOSE: A broadcasting data transmission system is provided to improve data transmission performance in a fading channel by decoding a data stream. CONSTITUTION: A broadcasting data transmission apparatus controls the transmission power of a data stream according to a modulation method about each transmission antenna(310). The broadcasting data transmission apparatus previously codes the data stream controlled by the transmission power using a pre-coding matrix according to the modulation method(320). The broadcasting data transmission apparatus transmits the coded data stream to a reception unit using the transmission antenna(330).
Abstract:
본 발명은 저독성 폴리에스터계 분체도료의 경화제로 유용한 2-하이드록시 아마이드 화합물, 이의 제조방법 및 이를 경화제의 주성분으로 포함하는 폴리에스터 분체도료 조성물에 관한 것이다. 분체도료, 저독성, 폴리에스터, 경화제, β-HAA, 2-하이드록시-N,N,N',N'-테트라키스(2-하이드록시에틸)알킬아마이드, 2-하이드록시 아마이드
Abstract:
PURPOSE: A 2-hydroxy amide compound is provided to suppress generation of micro holes and to improve mechanical strength and heat resistance. CONSTITUTION: A 2-hydroxy amide compound is represented by chemical formula 1, wherein A is linear or branched (C1~C7) alkylene; R1 ~ R4 are selected from linear or branched (C1~C7) alkyl in which at least one -OH is substituted. The 2-hydroxy amide compound is pure (S)-stereoisomer, pure (R)-stereoisomer or their mixture.
Abstract:
PURPOSE: A cycloalkane dicarboxamide compound is provided to improve mechanical strength and heat resistance when used as a hardener of polyester powder resin. CONSTITUTION: A cycloalkane dicarboxamide compound is represented by formula 1. In formula 1, R1~R4 are independently linear or branched C1-C7 alkyl groups of which one or more hydroxyl groups are substituted; R9 and R10 are independently hydrogen, hydroxyl group, or hydroxyl-substituted or non-substituted C1-C7 alkyl groups; and m and n are independently integers between 1 and 3.