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방사방향 전기장에 의한 액체 크로마토그래피에서의 체류시간 변화
이기용,김영대,조영상,심상준,이중기,최광진,우경자 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.4
크로마토그래피의 분리 효율을 증가시키기 위해 새로운 조절 변수 도입을 시도하였으며, 새로운 조절 변수로서 크로마토그래피에 방사(radial)방향의 전기장을 도입하였다. 전기장을 크로마토그래피 컬럼의 방사방향으로 가하여 이에 따른 대상물질의 체류시간 변화를 조사하였다. 다양한 대상물질, 용매 및 충진제를 사용한 모든 경우에 있어 전압을 가함에 의해 대상물질의 체류시간이 변화하는 것이 관찰되었으며, 용매와 충진제의 종류에 따라서 전압에 따른 대상물질의 체류시간이 증가하거나 감소하는 경향을 보여 주었다. 이것은 가해진 전기장이 대상물질-용매-충진제 사이의 상관관계에 영향을 미쳐 체류시간에 영향을 주는 것으로 보인다. 따라서 새로운 조절 변수로서 도입한 방사방향 전기장이 대상물질의 체류시간을 조절할 수 있으며, 이에 의해 방사방향 전기장을 사용한 대상물질의 체류시간 조절에 의해 크로마토그래피 분리효율을 증가시킬 수 있는 새로운 크로마토그래피의 개발 가능성이 제시되었다. Radial electric field was employed to efficiently control the solute retention times in liquid chromatography. It was observed that the solute retention times were changed by the applied radial electric field. This result indicates that the solute retention times can be controlled by the applied radial electric field strength, suggesting that a novel type chromatography can be developed employing the retention time control by the applied electric field. The change in the solute retention times seems to arise from the changed interactions among solute, solvent, and adsorbent due to the different degrees of their induced polarities.
이기용,Sun Do Kim,양수진 한국식품위생안전성학회 2020 한국식품위생안전성학회지 Vol.35 No.4
Human infections with livestock-associated methicillin-resistant/-susceptible Staphylococcus aureus (LA-MRSA/LA-MSSA) have recently been increasing significantly. These LA-MRSA and LA-MSSA strains can be transmitted to individuals who have frequent contact with livestock animals and foods of animal origin. In this study, major virulence potentials of S. aureus such as biofilm formation, antimicrobial peptide resistance, and in vitro hydrogen peroxide (H 2 O 2 ) resistance were assessed using 20 MRSA and MSSA strains isolated from raw milk, beef cattle, and workers in the livestock industry. Static biofilm formation assays revealed that there is no difference in levels of biofilm production between MRSA versus MSSA or bovine- versus human-associated strains. In vitro BMAP (bovine myeloid antimicrobial peptide)-28 susceptibility assays also revealed no difference in the resistance to the antimicrobial peptide between MRSA versus MSSA or bovine- versus human-associated S. aureus strains. However, LA-MRSA strains displayed increased resistance to H 2 O 2 , which may play an important role in survival and dissemination of the pathogen in livestock. These results provide an important basis for understanding pathogenic potentials of LA-MRSA and LA-MSSA strains in human and animal hosts.
도시 환경 센싱 데이터를 이용한 도시 내 특이 구역 탐색
이기용,서민지,강수현,이지완,김태홍 한국정보과학회 2017 데이타베이스 연구 Vol.33 No.3
Recently, as various sensing technologies for temperature, humidity, fine dust, air pollutant, and noise are developed, a lot of environmental sensing data for various regions in a city is being actively collected. In this paper, we propose a framework to find outlying regions in the city that show very different patterns from the other regions using urban environmental sensing data. To verify the effectiveness of the proposed framework, we also present a real example of finding outlying regions in Daejeon, Daegu, and Busan, where fine dust occurs very little or very high relative to the amount of air pollutant. We hope that outlying regions found by the proposed framework can provide useful information for improving the urban environment. 최근 온도, 습도, 미세먼지, 대기오염물질, 소음 등 다양한 대상에 대한 센싱 기술이 발전하면서 도시 내 여러 구역에 대한 환경 센싱 데이터가 활발히 수집되고 있다. 본 논문에서는 이러한 도시 환경 센싱 데이터를 이용하여 도시 내에서 다른 구역과 매우 다른 패턴을 보이는 특이 구역을 탐색하는 프레임워크를 제안한다. 또한 제안하는 특이 구역 탐색 프레임워크의 효용성을 검증하기 위해 실제로 대전, 대구, 부산에서 대기오염물질의 양에 비해 미세먼지가 매우 적게 혹은 매우 많이 발생하는 특이 구역을 탐색한 예를 제시한다. 제안 프레임워크로 탐색된 특이 구역들의 특성 또는 공통점을 파악하면 추후 도시 환경을 개선하는데 매우 유용한 정보를 얻을 수 있을 것으로 기대한다.
李起龍 牧園大學校 1982 論文集 - 牧園大學校 Vol.5 No.-
The purpose of this study is to find out how important is the influence of parental exp-ectation on the formation of a child's value orientation. Social climate is made up of the value preferences of members in the society. Also the value preference of children might be formed under the influence of their parents' expectations as one of the socio-cultural circumstances that create the social climate. Most of us, not only in our country but also all over the world, have been worried about the problems of youth which have been increasing continually. we haven't discovered why the problem have been increasing for such a long time. We can say that most of the problems of youth have appeared as a form of imitation and have been affected by the socio-cultural environment around them, rather than by their own creative and ingerent acts. The parents' expectations for their children is one of the most important socio-cultural factors that affected the irformaiion of value orient-ations. In this study I found that the younger the child, the mor affitmative his attitude about his home, school and social life, but the older the child, the more negative. Children inherently have innocent and sound characrers but the home and educational roles, which are to bring them up, are soundly weakened and children are strongly In conclusion what thoughts the parents have become those of their children's value-orientations. Therefore, to solve the problems of youth it is very important that parents should act and live as they hope their children will in everyday life.