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비직교 다중접속을 위한 딥러닝 기반의 다차원 변조 신호점 설계
서한창(Hanchang Seo),한민식(Minsig Han),강충구(Chung G. Kang) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.11
본 논문은 autoencoder 를 활용하여 최적화된 resource 맵핑 과 constellation 맵핑을 수행하는 새로운 code domain-NOMA 방식을 제안한다. 지금까지 고려되지 않은 새로운 구조의 autoencoder를 제안하여 minimum Euclidean 거리를 최대화하는 최적화된 다차원 심볼을 생성하도록 종단간학습(end-to-end learning)을 수행하고, 다중 사용자의 다차원 신호점에 대해서 복호화를 수행한다. 제안한 방식에 의해 10-3 의 비트오류 성능이 기존 SCMA 방식보다 4.5dB 이상 D-SCMA [2]보다 2.7dB 향상되는 것을 시뮬레이션을 통해 확인하였다.
이용길(Y. G. LEE),박경석(K. S. PARK) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
This paper is an experimental study that the fuel temperature and the engine operating condition have an effect on the distribution of fuel liquid film in the intake manifold and the experiment is carried out by means of 4cylinder engine motoring for the purpose of understanding the distribution trend of fuel liquid film flowing in the pipe inside wall supplied each cylinder of carburetor type gasoline engine.<br/> The pressure fluctuation difference between 1st and 3rd manifold is increased as the throttle valve opens widely. It showed the width of pressure wave tends to increase according as engine rpm is fast. and the difference of fuel liquid film formed in each manifold tends to decrease according as engine rpm is fast, temperature of supply fuel is high and throttle valve opening is wide. It could be confirmed visually that the non-uniform supply of mixture on each cylinder is because of fuel liquid film forming in the intake manifold.
박재윤(Park. J.P),정장근(Jung. J.G),김종석(Kim. J.S),이용길(Lee. Y.G),김광태(Kim. K.T) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
We studied the effect of the type of non-thermal plasma on the decomposition of CF₄. 3 types of reactors were manufactured to generate different types of plasma respectively, and went into the experiments. As the results, we found that high density of the energy of non-thermal plasma and the minimization of non-discharged area should be met in order to elevate decomposition rate of CF₄. Among the reactors used in the study, the hole-type reactor was such one that satisfying that requirement. Using the hole-type reactor, treatment efficiency for high concentration of CF₄ was excellent. We got decomposition rate of more than 95[%] between 500[ppm] around and less than 400[ppm], and up to 85[%] at 900[ppm].