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이승대 慶星大學校 1994 論文集 Vol.15 No.3
On se demande parfois ce qu'est la preposition, si la preposition "de" est porteuse de sens et quelle est sa propre fonction. Pour bien repondre a ces questions, on a tente d'abord de definir la preposition semantiquement et syntaxiquement d'apres la theorie de G. Guillaume. Ensuite on a montre que l'immanence de la preposition "de" est caracterisee par son incidence bilaterale et sa transtivite et que la semantese de la preposition "de" serait consideree comme l'operation d'eloignement ou celle de determination. La transendance de la fonction prepositionnelle nous met en presence du mot "de" non refere a un support d'avant. On parle souvent de la particule "de" qui n'a qu'une supprot d'apres et qui ne serait plus la preposition. En examinant, en discour, des phrases avec la particule "de" -il y a deux grands types: l'un est celle de "de+article+nom", l'autre est celle de "de+infinitif", -on peut supposer que la particule "de" est un element d'article ou lui-meme article. Si on pousse l'analyse plus loin avec tant de phrases d'exemplaires, on pourra expliquer clairement la nature de la particule "de".
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이승대,Lee, Seung-Dae Korea Computer Institute Society 2008 컴퓨터産業敎育學會論文誌 Vol.9 No.2
The diversity reception and the equal gain combining technique are applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DSSS BPSK system which has the receiving structure with the compensation algorithm is formed on the diversity branch, and the characteristics of the system are evaluated at the view point of the average bit error rate due to the SNR. In addition, the multi-tap update algorithm which is superior for the data compensation is suggested. Moreover, using the American Joint Technical Committee PCS RF channel characterization and system deployment model standard, the suggested multi-tap update algorithm is compared and analyzed with the view-point of the average bit error rate and convergence speed for evaluating the realistic efficiency of the system.
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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.
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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.
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심장 전기도 시스템을 위한 심장 칼라 애니메이션 소프트웨어 개발
이승대,한영오,Lee, Seung-Dae,Han, Young-Oh 한국컴퓨터산업학회 2009 컴퓨터産業敎育學會論文誌 Vol.10 No.5
In this paper, the cardiac color animation software for cardiac activation system based on PC was developed. This software was implemented with 3 dimension cardiac color modeling and rotating. 본 연구는 PC 기반 심장 전기도 시스템에서 사용될 수 있는 심장 칼라 애니메이션 소프트웨어를 개발하였다. 개발된 소프트웨어는 심장의 3차원 칼라 모델링과 회전이 가능하도록 구현되었다.
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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.
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이승대 남서울대학교 1996 남서울대학교 논문집 Vol.2 No.-
The acquisition system of direct sequence(DS) is implemented using a stepped serial search scheme. To measure the acquisition system performance, mean acquisition time which is required time to acquire is estimated and the algorithm that can easily control to PN code is applied to search/lock logic circuit. Also a optimal number of lock state of this system is found by measuring a mean acquisition time due to the number of lock state. The measured mean acquisition time and variance in the acquisition system with two lock states is 0.2874 sec and 0.0421 respectively, that with three lock states is 0.3799 sec and 0.0536 respectively. Therefore we know that the acquisition system which have three lock states or more is inadequate to satisfy the acquisition limit time(300㎳).
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이승대 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.1
The characteristics of a bonding wire which is widely used in interconnection bare chip or bare die to the substrate is studied. The ohmic resistance is calculated using the phenomenological loss equivalence(PEM) method. In addition, input impedance according to the structure of bonding wire is obtained using the method of moment. The inductance, the capacitance and the characteristics parameters of a bonding pad interconnection bonding wire are calculated.
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