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RISS 인기검색어
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- 저자 : 이승대(Seung Dae Lee) (검색결과 59 건)
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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.
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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.
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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 2009 컴퓨터産業敎育學會論文誌 Vol.10 No.3
In this paper, fluorescent lamp on/off control and luminous intensity used an power line communication and remotely will be able to control system design. Embodied the respectively illumination equipment and tools by the network using PLC. In order to remote control and on/off of illumination equipment, luminous intensity composed a server. Will convert a previous analog system with digital system and the possibility witch will reduce an error ratio was. Consequently will be able to simplify a circuit.
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이승대,Lee Seung-Dae 한국컴퓨터산업학회 2006 컴퓨터産業敎育學會論文誌 Vol.7 No.1
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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이승대,한영오,Lee Seung-Dae,Han Yung-Oh 한국컴퓨터산업학회 2005 컴퓨터産業敎育學會論文誌 Vol.6 No.3
높은 스펙트럼 효율을 갖는 선형 변조방식은 이동체 통신 시스템에 적용시 문제점이 발생한다. 본 논문에서는 이러한 문제점을 해결하기 위하여 전력 증폭기의 비선형성을 선형화하는 방법에 대하여 고찰하고 설계이론을 바탕으로 고주파 전력 증폭기를 설계 및 제작하였다. 제작된 고주파 전력 증폭기는 마이크로스트림 라인을 사용하였으며 중심주파수 1 GHz에서 13 dBm 입력에 28 dBm의 출력을 얻을 수 있었다.
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이승대(Lee, Seung-Dae) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.2
본 논문에서는 LC 필터 기술을 기반으로 하는 광대역 주파수 이중 하향변환기(Frequency Double Down- Converter)를 설계 및 제작하였다. 설계한 이중 하향변환기는 저잡음 증폭기, 혼합기, IF 증폭기, LC 필터 등으로 구 성되며, DC-Block 커패시터와 RF-Bypass 커패시터로 구성된다. 설계 시에 기존 변환기의 능동소자를 수동소자로 구 현하였으며 이에 따라 전력감소 및 저가의 비용을 실현할 수 있었다. 측정 결과, 제작한 주파수 이중 하향변환기는 중심 주파수 63MHz에서 대역폭 100MHz (13∼113MHz)인 광대역을 실현하였으며, 이득은 약 40dB임을 확인하였다. In this paper, the broadband frequency double down-converter based on LC filter technologies has been designed and implemented, and its performances are introduced. The Designed frequency double down-converter is consisted with a low-noise amplifier, mixer, IF amplifier, LC filter, DC-block capacitor and RF-bypass capacitor. Especially, instead of active devices of a typical converter, the suggested converter designed using passive devices to provide both low-power consumption and low-cost model. As results of the measurement, the implemented frequency double down-converter realizes the broadband performance with the bandwidth of 100MHz (13∼113MHz) at the center frequency of 63MHz, and its gain is approximately 40dB.
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