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밤나무 꽃과 잎의 화학성분 및 항균활성 검색 -제1보. 화학성분 조성-
조규성 ( Jo Gyu Seong ),조재선 ( Jo Jae Seon ) 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.3
Chemical components relevant to the characteristic antimicrobial activities of the Korean chestnut(Castanea crenata S. et Z.) leaves and flowers were analyzed. The composition of free sugar were sucrose, maltose in the chestnut flower and 1.98% in the chestnut leaves. In fatty acids case, the linoleic contents were significantly high in the chestnut leaves and flowers. The organic acids showed high composition to succnic and citric acid in the chestnut leaves. The amino acid compositions showed high contents to aspatic acid, proline, glutamic acid, glycine and methionine in the chestnut leaves than flowers. The total amino acid showed significantly higher in the chestnut leaves than flowers. The major minerals contained in the chestnut leaves and flowers were K, Ca, Ng. Fe, Mn and Al. Ascorbic acids were detected highly in the chestnut leaves and flowers.
밤나무 꽃과 화학성분 및 항균활성 검색 -제2보. 항균활성 검색-
조규성 ( Jo Gyu Seong ),김해영 ( Kim Hae Yeong ) 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.3
Chestnut (Castanea crenata S. et Z.) leaves and flowers were extracted with 80% methanol and then fractionated with ethylacetate, methanol and water. Their antimicrobial activities in each fraction were investigated. Methanol fraction of the chestnut leaves and flower showed strong antimicrbial activities against both of Gram positive and Gram negative bacteria. The ethylacetate and water fraction, however, showed only weak antimicrobial activities when the antimicrobial activities were occurred. Minimal inhibitory concentration (MIC) of the methanol extracts of the chestnut leaves and flowers against 5 strains of Gram positive and Gram negative bacteria were at 60 ㎍/disc. The extracts of the chestnut leaves and flowers inhibited the growth of Bacillus subtilis at 0.5% (w/w) concentration. In order to investigate the effect of extraction methods on the B. subtilis, scanning electron microscope was used. The B. subtilis was damaged when the methanol extracts of the chestnut leves and flowers were at 500 ppm.
위성-지상 통합망에서 주파수 재사용 인자에 따른 자원할당 알고리즘 성능 분석
조규성(Gyuseong Jo),오대섭(Daesub Oh),짠샷타(Satya Chan),김수영(Sooyoung Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문은 다중빔 위성을 사용하는 위성-지상 통합망에서 대역폭과 전력 자원을 효율적으로 할당하는 방식의 성능을 분석한 결과를 제시한다. 주파수 재사용 기법을 사용하여 주어진 대역폭을 최적으로 할당하고, 인접 빔 또는 셀과의 간접을 고려하여 할당 전력을 최소화하는 기법을 사용한다. 주파수 재사용 인자에 따른 다양한 성능 시뮬레이션 결과를 제시하고, 여러가지 측면에서 분석하였다.