• 한국광물학회지
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• 제30권4호
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• pp.219-227
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• 2017

북극해 망간단괴는 카라해, 바렌츠해 등에서 발견되었지만, 광물조성과 화학조성에 대해서는 정확하게 조사된 바가 없다. 이번 연구에서는 Arctic Expedition ARA07C 탐사를 통해 동시베리아 북부 해역에서 획득한 망간단괴에 대하여, 광물학적 및 지구화학적 특성을 파악하고, 이를 통하여 그 성인에 대하여 추정하였다. 망간단괴를 구성하는 주된 산화망간광물은 부서라이트, 버네사이트, 버나다이트 등이다. 망간단괴는 대체로 방사상대와 괴상대 조직을 나타내며, 층상대는 제한적으로 발달한다. 동시베리아해 망간단괴의 주요한 특징인 방사상대에는 주로 첨-구상조직이 발달한다. 동시베리아해 망간단괴는 태평양이나 인도양에서 산출되는 망간단괴에 비하여 Mn은 풍부하지만 Fe의 함량은 매우 부족하다. 단괴 외곽과 내부, 또는 미세조직에 따른 화학성분의 차이는 거의 없었다. 미세조직 간의 화학적 성분 차이가 거의 나타나지 않기 때문에 단괴는 성장하는 동안 하나의 성인을 가질 가능성이 크며, $Mn-Fe-(Cu+Ni+Co){\times}10$ 삼각도표에서 모두 속성기원을 지시한다. 북극해로 유입되는 대부분의 Mn은 강 또는 연안 침식에 의해 비롯되며, 이들 대부분이 북극해에 갇혀져 있기 때문에 동시베리아해 망간단괴에서 특징적으로 높은 Mn 함량을 나타내는 것으로 판단된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2462-2464
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• 1999

All electric and electronic appliances require their own electromagnetic compatibility. So an industrially advanced nations have made many standards for regulation for their profits thus the researches on the electro-magnetic shielding effect(SE) are being increased. But the SE can not proved its effect by a theory alone because of complex-material problems. This study Present the correlation of the SE and immunity of radiated radio frequency of the electromagnetic field. We have analyzed the theory of shielding effect to the shield texture. It has been proved that experimental results showed this effects have intensive relations to the electromagnetic field immunity.

• 대한미생물학회지
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• 제21권3호
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• pp.363-373
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• 1986

We developed a giant colony test system with rapidly growing mycobacteria by stab-culture with a loopful inoculum of cells into Middlebrook 7H10 agar medium containing soluble extracts of the fruits of Gardenia jasminoides(7H10-crocin agar medium) and assessed the significance of the giant colony test with 28 strains of 10 clusters of rapidly growing mycobacteria classified by the simple biological 5-test characters. Of the 10 clusters of mycobacteria tested, some of strains which belonged to cluster No. 1a, 5a and 11a did grow as gravis types, whereas most of other clusters gave mitis or intermedius types in their colonial sizes at 12 days culture. By this test, pathogenic strains of M. fortuitum-chelonei complex which belonged to cluster No. 5a, b, 7a and 8a, b could be divided into gravis, intermedius and mitis colony types and the gravis ones were characterized by bluish-white "mushroom-shaped" colonies with central complexes in the texture, whereas the intermedius gave grayish-white "flower-shaped" colonies with radiated folds, but without any central complexes. The mitis colonies were characterized by grayish-white smooth or smooth mucoid colonies and were common among the clusters in their shapes. The colony of M. chelonei was bluish-white mitis type and was characterized by its hilly rhizoid colony. The gravis colony of cluster No. 1a identified as M. phlei was characterized by yellow "round straw- mat-shaped" or "chrysanthemum-shaped" colony with whole complexes in the texture, and the gravis colonies of the cluster No. 11a gave grayish-white "flower-shaped" colonies with central stamens, radiating trough and fine cup-shaped strands in the texture. The four colony types of pathogenic species of M. fortuitum-chelonei complex on 7H10-crocin agar medium were distinctive from those of other clusters of rapidly growing mycobacteria and these results indicated that the giant colony test, in conjunction with the simple 5-test characters, would be of value in the differentiation of M. fortuitum complex from other clusters of rapidly growing mycobacteria.