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金永權 中央醫學社 1968 中央醫學 Vol.14 No.6
The bacteriological characteristics and the pathogenicity of enteropathogenic halophilic vibrios isolated from sea-fishes and shell-fishes collected in the port of Pohang, Kyungpook during July and August of 1966 and 1967 were studied, and the following results were obtained. 1. Vibrios were classified into three species, i.e. Vibrio parahaemolitycus, V. alginolyticus, and V. anguillarum. The criteria of classification were based on the growth on nutrient agar containing 7 and 10 per cent of sodium chloride, Voges-Proskauer reaction, swarming growth on nutrient agar, and fermentation of sucrose and cellobiose. 2. The biological characteristics of vibrios were, in general, uniform among strains in each. species, and three species of vibrios showed their typical characteristics in each species.. 3. Most of test organisms can grow well in trypticase soy broth of pH 4.5-5.0, and there were a few strains which can grow in media of pH 6. 0 4. Most strains were resistant to penicillin, methicillin, and cloxacillin, and grow well in the presence of 200-100u or mcg/ml of these antibiotics. The resistance to streptomycin and erythromycin was moderate and the minimum inhibitory concentration (M.I.C.) was 50 mcg/ml or more in most strains. However, the sensitivity to chloramphenicol, aureomycin, terramycin, and tetracyline was very high with the M.I.C. of 1.6mcg/ml, and there were some strains with the M.I.C. of 3.1-6. 2mcg/ml including a few strains with the M.I.C. of 6.2mcg/ml. 5. One-half to one-fourth ml of broth culture containing 3.8-8.3X108/ml of viable cells were injected into the peritoneal cavity of mouse, and the death was observed.
광위성 통신 및 광무선 LAN의 구현을 위한 대기 광통신 성능향상에 관한 연구
김영권,정진호,김재평,김인호,홍권의,한종석,Kim, Yung-Kwon,Jung, Jin-Ho,Kim, Jae-Pyung,Kim, In-Ho,Hong, Kwon-Eui,Han, Jong-Seok 한국전기전자학회 1997 전기전자학회논문지 Vol.1 No.1
무선광통신은 RF보다 고속도 대용량 정보전송이 가능하며, 높은 안테나이득을 얻을 수 있다. 그러나, 무선광통신에서 사용하는 대기채널은 흡수 교란 산란 등의 현상이 문제되고 있다. 이 현상들은 광무선통신시스템의 성능을 제한한다. 본 논문은 그 중에서 교란의 현상을 줄이기 위해 교란강도측정기와 광무선LAN을 제작하고, (2,1,6) 길쌈부호기와 비터비복호기를 사용하여 통신성능을 개선한 다음, 이를 실험적으로 확인하였다. 또한, 산란이 광무선통신시스템의 성능에 미치는 영향을 알아보기 위해 각 기상조건과 상, 하향링크에 따른 지구국안데나 직경을 수치해석하여 그 결과를 제시하였다. Wireless optical communication is able to obtain high antenna gain as well as utilize to transmit the high-speed information with large capacity than the RF communication. However, the propagation path (atmosphere) is considered as an attenuator occured turbulence, absorption and scattering. These undesired phenomena diminish the amount of light that is collected at the receiver. To evaluate the effect of the atmospheric turbulance and scattering, this paper perform the ground-to-ground wireless optical LAN experiment by using the (2,1,6) convolutional coder and Viterbi decoder, and analyze numerically the earth-station antenna diameter due to the propagation path condition and upstream/downstream link.