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형태학적 영상처리를 이용한 어체 측정 시스템 개발에 관한 연구
이동길 ( Dong Gil Lee ),양용수 ( Yong Su Yang ),김성훈 ( Seong Hun Kim ),최정화 ( Jung Hwa Choi ),강준구 ( Jun Gu Kang ),김희제 ( Hee Je Kim ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.4
To manage, sort, and grade fishery resources, it is necessary to measure their morphometric characteristics. This labor-intensive task involves performing repetitive operations on land and on a research vessel. To reduce the amount of labor required, a vision-based automatic measurement system (VAMS) for the measurement of morphometric characteristics of flatfish, such as total length (TL), body width (BW), and body height (BH), has been developed as part of a database management system for fishery resources management. This system can also measure the mass (M) of flatfish. In the present study, we describe a morphological image processing algorithm for the measurement of certain characteristics of flatfish. This algorithm, which involves preprocessing, edge pattern matching, and edge point detection, is effective in cases where the flatfish being measured has a deformed tail and is randomly oriented. The satisfactory performance of the proposed algorithm is also demonstrated by means of experiments involving the measurement of the BW, TL and BH of a flatfish when it is straightened (BW:117mm, TL:329mm, BH: 24.5mm), when its tail is deformed, and when it is randomly oriented.
이인재(Lee In- Jae),이동길(Lee Dong-Gil),이유종(Lee Yoo-Jong),최삼길(Choi Sam-Gil) 동의대학교 정보통신연구소 2004 정보통신연구지 Vol.5 No.-
이동통신용 광 중계기 시스템에서 광ㆍ· 전 변환된 미약한 전기 신호를 원하는 레벨까지 증폭 시켜줄 필요가 있다. 이때 사용되는 장치가 전치 저잡음 증폭기 (LNA, low noise amplifier) 로 우수한 잡음 특성을 유지시키며 미약한 레벨의 신호를 증폭시켜주는 소자이다. 본 논문에서는 입ㆍ출력 전압정재파비 (VSWR, voltage standing wave ratio) 개선을 위해 branch line coupler를 사용한 2단 저잡음 평형 증폭기를 설계, 제작하여 동작 특성을 분석 하였다. LNA 설계 시 각단 증폭기의 특성과 2단 LNA 의 특성을 측정한 2단 저잡음 평형 증폭기를 설계하였다.2 GHz 대역에서 이득은 26.3 dB, S 11 은 -19.5 dB, S 22는 -26.0 dB 의 우수한 특성값을 얻었다. 잡음지수는 (NF, noise figure) 1.3 dB, 입ㆍ· 출력 YSWR 의 측정 결과는 각각 1.05:1 과 1.1:1 의 좋은 특성을 얻었다.
Xenon flashlamp와 광촉매를 이용한 타원형 반응기의 살균 특성에 관한 연구
이동길(Dong-Gil Lee),홍지태(Ji-Tae Hong),최경화(Kyoung-Hwa Choi),차재호(Jaeho Cha),김홍주(Hong-Ju Kim),김희제(Hee-Je Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.3
In this paper, we invented a new and unique technique for the sterilization of Escherichia coli(E. coli) in polluted water. We applied a rich ultra-violet(UV) light from pulsed xenon flashlamp and photocatalyst(TiO₂) to sterilize E. coli in polluted water. This method based on the use of UV light and photocatalyst is eco-friendly and does not cause secondary pollution. The proposed elliptical reactor is able to concentrate on quartz sleeve coated TiO₂ or general quartz sleeve. The primary objective of our research was to determine the important parameters such as pulse repetition rate and input voltage and to know on the sterilizing efficiency of quartz sleeve coated TiO₂ and general quartz sleeve. We obtained to achieve 99.999% sterilization in as little as 6 pulses at 800 V in case of quartz sleeve coated TiO₂, and 10 pulses at 800 V in case of general quartz sleeve for 5 minutes. Although transmitted light of quartz sleeve coated TiO₂ is deceased, the sterilizing efficiency is increased by 40% than general quartz sleeve. The reason of high sterilizing efficiency is that generated hydroxyl radical(OH) by photocatalyst and is able to concentrate light at a focus by using elliptical reactor.