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      • 불어의 품사분류와 전치사

        이승대 慶星大學校 1989 論文集 Vol.10 No.2

        La coherence profonde et absolu d'une langue devra etre cherchee sur le plan de langue, non sur le plan de discours. D'apres l'enseignement de Guillaume et a l'aide de l'oeuvre de Moignet, on a essaye d'etablir la classification des parties de la langue sur la base du principe de l'incidence, pour voir la coherence de la systeme du fracais. Ensuite avec la meme methode de l'analyse, on definit la notion et les specificites de la preposition. En conclusion, la preposition est definie par les duex supports. S'il n'y a pas de deux supports, la particule n'est plus preposition et il devient une autre chose. La specificite la plus importante de la preposition est la transitivite. Avec cette transitivite, la preposition resout des problems issus de l'intransitivite de nom, adjectif, adverbe et des verbes intransitifs.

      • 시변채널 모델에서 다중 탭 갱신 알고리즘에 관한 연구

        이승대,Lee Seung-Dae 한국컴퓨터산업학회 2006 컴퓨터産業敎育學會論文誌 Vol.7 No.1

        고속의 데이터 전송에 대한 채널의 왜곡을 보상하기 위해 다중 경로 다이버시티 수신을 수행하였다. 다이버시티 가지에 보상 알고리즘을 결합한 수신 구조를 갖는 DS/BPSK 시스템을 구성하고 시스템의 성능을 SNR에 따른 평균 비트 에러율 관점에서 평가하였다. 상호부호간 간섭을 극복하기 위해 L 개의 다이버시티 가지에 비선형 탭 지연선 구조를 사용하고 보상 알고리즘에 따라 탭 계수가 시변채널에 적응하도록 하였다. 그 결과 일반적인 보상 알고리즘에 비해 제안한 알고리즘의 평균 비트 에러율이 $10^{-2}$ 정도 개선되었다. Multipath diversity reception is applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DS/BPSK systems are composed of the equipment with reception structure combined with a compensation algorithm to diversity branch. The efficiency of the system is evaluated from the point of view of average bit error rate according to SNR. In order to remove intersymbol interference, this algorithm is applied to time-invariant channel at every diversity branch with the number of L. As a result, the average bit error rate is saturated by $10^{-2}$ at the conventional compensation algorithm.

      • FDTD 기법을 적용한 패키지 접속 선로에 대한 전자기적 특성

        이승대 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.2

        As digital circuit speed increase and their size diminish, electrical characteristics of interconnections have become more significant to the overall circuit performance. In the design process of high speed digital circuit, engineer must not only consider the propagation delay and line impedance, but also take account of other effects such as signal degradation caused by transmission line dispersion, signal reflection at interconnection discontinuities, and crosstalk between adjacent and crossed lines. In this paper, the above phenomena in the bend type of packaging interconnections are analyzed by using the three-dimensional finite difference time domain method. These interconnection structures are fabricated on the substrate and measured. It is found that FDTD results and experimental outcomes are almost close.

      • FDTD 기법을 적용한 갭 구조에 대한 전자기적 특성

        이승대 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.2

        As digital circuit speed increase and their size diminish, electrical characteristics of interconnections have become more significant to the overall circuit performance. In the design process of high speed digital circuit, engineer must not only consider the propagation delay and line impedance, but also take account of other effects such as signal degradation caused by transmission line dispersion, signal reflection at interconnection discontinuities, and crosstalk between adjacent and crossed lines. In this paper, the above phenomena in the bend type of packaging interconnections are analyzed by using the three-dimensional finite difference time domain method.

      • 시불변 채널 모델에 따른 보상 알고리즘

        이승대 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.2

        In this paper, multipath diversity reception is applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DSSS PSK systems are composed of the equipment with reception structure combined with a compensation algorithm to diversity branch. The efficiency of the system is evaluated from the point of view of average bit error rate according to SNR. The linear and nonlinear tapped delay line structures are introduced, which enable to update tap coefficients in terms of compensation algorithm. In order to remove intersymbol interference, this algorithm is applied to time-invariant channel at every diversity branch with the number of L. As a result, the average bit error rate is saturated by 10^(-3)~10^(-4) at the conventional compensation algorithm.

      • W-CDMA 용 광대역 BPF의 설계 및 제작

        이승대 남서울대학교 공학연구센터 2003 공학연구 Vol.4 No.-

        In this paper, achieves minimization for dimension and insertion loss of cavity resonator by reduced order of the cavity using notch pole. This band-pass filter(BPF) is designed and fabricated for center frequency of 2.14 GHz and bandwidth of 18.84 MHz. From the results, the wideband BPF has insertion loss of -1.54dB and attenuation coefficient of less than -l5dB.

      • 이동무선채널환경에서 동기추적 시스템의 고찰

        이승대 남서울대학교 2002 남서울대학교 논문집 Vol.8 No.-

        In this paper, the performance of delay-lock loop scheme and tau-dither loop scheme for code tracking in FH/CDMA are evaluated under mobile radio communication channel environments. As the results for code tracking system, it is shown that the performance of delay-lock loop scheme is superior to tau-dither loop scheme. Also, it is shown that its performance is improved under Rayleigh/Rician fading environments.

      • 주파수 선택성 페이딩 채널에서 보상 알고리즘의 수렴특성

        이승대,Lee, Seung-Dae 한국컴퓨터산업학회 2007 컴퓨터産業敎育學會論文誌 Vol.8 No.4

        It applied the linear tapped delay line structure to the least mean square algorithm and the recursive least square algorithm it investigated the mean square error characteristics of compensation algorithm. The purpose of this paper is to propose multi-tap update algorithm, which is superior to compensation capacity of data, and then compare and analyze it from the perspective of convergence characteristics at time invariant transmission channel and frequency selective fading channel. 본 논문에서는 시불변 전송 채널 및 주파수 선택성 페이딩 채널에서 최소 제곱 평균 알고리즘과 순차적 최소 제곱 알고리즘에 선형 탭 지연선 구조를 도입하여 보상 알고리즘의 제곱 평균 에러 특성을 고찰하였다. 또한 기존의 방식에서 사용하는 단일 탭 갱신 알고리즘과 본 논문에서 제안한 다중 탭 갱신 알고리즘을 비교, 분석하고 이를 수렴 특성 관점에서 고찰하였다.

      • 육상이동무선 채널에서 초기동기 시스템의 성능분석

        이승대 남서울대학교 2001 남서울대학교 논문집 Vol.7 No.-

        In this paper, the performance of stepped serial search scheme and matched filter scheme for code acquisition in FH/CDMA are evaluated under land mobile radio communication channel environments. As the results for code acquisition system, it is shown that the performance of stepped serial scheme is superior to matched filter scheme, because system complexity is reduced and system performance is improved by increasing the hopping frequency not to substitute for special hardware. Also, it is shown that its performance is improved under Rayleigh/Rician fading environments.

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