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The purp상구균의 인체 치은 섬유모 세포에 대한 세포내 침입
김강주,정규용 대한치주과학회 2002 Journal of Periodontal & Implant Science Vol.32 No.3
The purp상구균의 인체 치은 섬유모세포에 대한 세포내 침입
Porphyromonas gingivalis의 독성, 대사산물 및 유전자이종성과의 관련성
김강주,정종평,Kim, Kang-Ju,Chung, Chong-Pyoung 대한치주과학회 1993 Journal of Periodontal & Implant Science Vol.23 No.1
P. gingivalis has been implicated as a strong pathogen in periodontal disease and known to have three serotypes of P. gingivalis. The purpose of this study is to investigate on the relationship between virulence, metabolic acids and genetic heterogeneity of P. gingivalis. P. gingivalis W50 standard strain and five strains of P. gingivalis serotype b Korean isolates were used in this study. For in vitro virulence test, lyophilized whole cell P. gingivalis were suspended, and sonicated with ultrasonic dismembranometer. Sonicated samples were applied to cultured cells derived from periodontal ligament, and cell activity was assayed with growth and survival assay. The metabolic acids were also extracted, and determined by High Performance Liquid Chromatography. Pst I-digested bacterial genomic DNA was electrophoresed, and densitometric analysis was performed to study the genetic heterogeneity. All of the P. gingivalis serotype b produced butyric acid. In cell activity study, butyric acid inhibited the cell activity irrespective of its concentration. Densitometric analysis showed restriction fragment length polymorphism. These results suggested that there existed heterogeneity of the metabolic acids and the virulence of P. gingivalis and such heterogeneity might be related to genetic heterogeneity.
지하수환경영향예측을 위한 지하수모델의 적용현황 및 문제점: 환경영향평가서와 먹는샘물환경영향조사서를 중심으로
김강주 한국지하수토양환경학회 1999 지하수환경 Vol.6 No.2
본 연구는 환경영향평가와 먹는샘물 환경영향조사에서 환경영향예측에 지하수 모델이 적용되고 있는 현황을 조사. 문제점을 파악함으로써. 향후 바람직한 모델 적용이 이루어지도록 하는 것을 목적으로 착수되었다. 본 연구는 환경영향평가서 544건과 먹는샘물환경영향조사보고서 16부를 대상으로 수행하였다. 환경영향평가 대상사업의 경우, 지하수계에 영향을 초래할 수 있는 사업이 상당수 존재하는 것으로 확인되었음에도 불구하고 지하수모델 적용은 전무하였다. 전체적으로도 다른 분야에 비하여 지하수환경에 대한 평가는 거의 무시되어지고 있는 실정이었다. 먹는샘물환경영향조사보고서의 경우는 모델이 일반적으로 적용되고는 있었으나, 그 운용에 상당한 문제가 있는 것으로 확인되었다. 주요 문제점들로는 종류와 수가 극히 제한된 자료를 이용한 모델보정, 부적절한 무유량경계 설정. 강수량을 몇 배나 초과할 정도로 엄청난 지하수가 함양되는 모델 제시 등이었다. 이밖에도, 수렴되지 않은 결과를 제시하는 경우도 조사대상 15건 중 3건이나 되었다. 이와 같은 현황은 모델담당자들의 전문지식 부족이 주된 원인으로 생각되어지며, 문제해결을 위해서 현장인력에 대한 보다 체계적인 재교육프로그램이 절실한 것으로 판단된다. This work was initiated to investigate current situation and problems in applying groundwater-related models for various kinds of environmental impact assessment in Korea. and therefore. to enhance appropriate application in the future. This study was carried out with 544 and 16 documents of EIA (Environmental Impact Assessment. Law of Environmental Impact Assessment) and Mineral-Water EIA (“the environmental impact investigation for mineral water developments”; Law of Drinking Water Management). respectively. It was revealed that there were considerably many cases which may cause serious impacts on subsurface environments in EIA. However. none applied groundwater models. Generally, the influences on subsurface system were underestimated or even ignored in EIA. For Mineral-Water EIA. groundwater models wert applied. in general. But. numerous and serious problems were noted: limited number of calibration parameters and parameter types. setting boundary conditions without adequate bases. recharge rates several times higher than precipitation rates. numerically unstable results. etc. Such kinds of misusages seem to be caused by modelers larking in professional knowledges. To solve the problems revealed from this study. more systematic re-education programs are suggested.
김강주,박용범 한국반도체디스플레이기술학회 2018 반도체디스플레이기술학회지 Vol.17 No.3
The drone has the restrictions on the controls, the battery and the surrounding environment in performing missions such as fire extinguishing. This restriction can improve the limitations that leave the leader can be monitored. The existing method of constructing the leader based on the GPS is highly dependent on the signal and is vulnerable to hardware defects. In this paper, we solve these problems with dynamic leaders decision. Drones can use their leader drones rather than remote controls. Information about the drones changes depending on the surrounding environment by replacing the leader with a dead battery or electing leader by the drones themselves without human intervention. This suggests that the leader monitors the community through a framework for continuing the drones collaboration and that the community can collaborate to overcome the limitations and continue the mission. The analysis of the proposed system through simulation experiments confirm that it has a better task performance. By using this system, it is possible to continue the mission and solve problems that are vulnerable to hardware defects.