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抗生劑 及 代謝抑制劑 Pyocyanin 及 Oxidase 産生에 미치는 影響
朴商煥,池重敏,張元龍 中央醫學社 1963 中央醫學 Vol.4 No.2
In the previous communication, authors had studied the relation between pyocyanin production and oxidase formation of Pseudomonas aeruginosa, and it was found that the production of pyocyanin and oxidase are paralleled on the nutrient agar, but inhibted in media containing reducing agents. In the present report, authors report the effects of antibiotics and enzyme inhibitors on pyocyanin and cytochrome oxidase produciton of Ps. aeruginosa. The results are as follopws: 1. Of the antibiotics tesed, streptomycin and kanamycin markedly enhanced the pyocyanin producion, and erythromycin and Neomycin, on the other hand, inhibit the giment formation on the nutrient agar. 2. All the antibiotics, regardless of cincintration, inhibit the oxidase produciton. 3. KCN inhibit the pyocyanin produciton, while P-nitrophenol inhibit the exidase production in the broth culture.
유한 상태 머신 기반 레이더 신호의 펄스 반복 주기 검출 알고리즘
박상환,주영관,김관태,전중남 대한전자공학회 2016 전자공학회논문지 Vol.53 No.7
Typically, radar systems change the pulse repetition interval of their modulated signal in order to avoid detection. On the other hand the radar-signal detection system tries to detect the modulation pattern. The histogram or auto-correlation methods are usually used to detect the PRI pattern of the radar signal. However these methods tend to lost the sequence information of the PRI pulses. This paper proposes a PRI-sequence detection algorithm based on the finite-state machine that could detect not only the PRI pattern but also their sequence. 레이더 시스템은 방사 신호의 탐지를 회피하기 위해 펄스 반복주기(PRI, Pulse Repetition Interval)와 PRI 패턴을 변조하고 있으며, 반대로 레이더 신호 탐지 시스템은 다양한 노력을 기울여 PRI와 PRI 패턴을 감지하려고 한다. 일반적으로 레이더 신호의 PRI 패턴을 검출하기 위해 펄스열의 도착시각에 대한 히스토그램 또는 자기 상관관계 기법으로 펄스 변조를 검출하고 있다. 본 논문에서는 유한 상태 머신 개념을 도입하여 펄스 반복주기를 검출하는 알고리즘을 제안한다. 이 알고리즘은 PRI 순서와 PRI 패턴을 찾을 수 있는 특징이 있다.
Al-3wt%Mg-1vol%BN 복합체의 대기중 고온산화
박상환,Chenguang Zhao,이동복 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The Al-3wt%Mg-1vol%BN composite was fabricated by the pressureless infiltration method. It was oxidized between 450 and 600℃ in air in order to study its high-temperature oxidation resistance. It displayed good oxidation behavior over the temperature range investigated. The oxide scales formed were thin, dense, adherent, and protective at all temperatures. The scale consists of g-Al₂O₃ and MgO at 500℃. It became entirely MgO at 550 and 600℃. The oxidation of the composite occurred slowly at 450, 500, 550℃, and rapidly at 600℃. The oxide scale formed by the outward diffusion of Mg, Al, and the inward diffusion of oxygen. The newly formed AlN and the initial BN particles with good thermal stability decreased the surface area exposed to oxidation and acted as a diffusion barrier to prevent the penetration of oxygen into the composite.