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DAF공정의 궤적분석에서 유선과 운동함수의 적용이 기포와 플록의 충돌효율에 미치는 영향
김성진,곽동희,임영환 한국물환경학회 2004 한국물환경학회지 Vol.20 No.6
Many researchers have been carrying on study to figure out the exact collision efficiency between bubble and floc. Collision efficiency can has generally been quantified by using trajectory analysis which uses the hydrodynamic, the electrostatic and van der waals forces. Two types of method are considered to induce the hydrodynamic force in the trajectory analysis. One is to use stream function and the other is to use mobility function. There was some difference between stream and mobility function depending upon modelling factors and conditions in trajectory analysis.
독고석,곽동희,김영환 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2
The dissolved air flotation(DAF) process has been widely used for removing suspended solids with low density in water. It has been known as measuring the size of microbubbles precisely which move upward rapidly in contact zone is difficult. In this study particle counter monitoring (PCM) method is used to measure the rising microbubble after injection from a nozzle. Size and distribution curve of microbubbles are evaluated at different conditions such as pressure drop at intermediate valve, length of pipeline between saturation tank and nozzle and low pressure. And the efficiency is also checked when it collides with different size floc. The experimental results show the following fact. As the final pressure drop occurred closer to a nozzle, the bubble size became smaller. And small bubble collides with large floc as well as small one because of its physical characteristic. However large bubble collides well with large floc rather than small one since hydrodynamic flow in streamline interferes to collide between two. With performing computational process by mathematical model we have analyzed and verified the size effect between bubble and floc. Collision efficiency is the highest when P/B ratio shows in the range of 0.75 < P/B ratio (R_(particle/Rbubble)) < 2.0.
김재홍,윤기범,박평원,김영진,전경민,김영태,김중환,곽호,구상완,송민석,유옥,지혜구,김동원,문상은,박영립,정승호,성범진,성순제,엄주용,황정열,이기홍,이주협,전태진 대한화학요법학회 1994 대한화학요법학회지 Vol.12 No.1
The prevalence of PPNG among pretreated gonorrhea cases isolated at the STD clinic of Choong-Ku Public Health Center in Seoul has been studied and reported annually since 1981. In 1991, 123 strains of N.gonorrhoeae were isolated, among which 58(47.1%) were PPNG. In 1992, 98 starains of N.gonorrhoeae were isolated, among which 51(52.0%) were PPNG. In all, 109(49.3%) strains were found to be PPNG among 221 strains isolated between 1991-1992. The prevalence of PPNG in Seoul showed increased tendency till 1989, thereafter, it has been stationary or slightly decreasing.
증례 : 감염 ; 후천성 면역 결핍증 환자에서 발생한 진행성 다발성 백질뇌병증 7예
곽동명 ( Dong Myoung Kwak ),정현일 ( Hyun Il Jeong ),박상민 ( Sang Min Park ),차혁환 ( Hyuck Hwan Cha ),정자영 ( Ja Yong Jung ),방지환 ( Ji Hwan Bang ),신형식 ( Hyoung Shik Shin ) 대한내과학회 2010 대한내과학회지 Vol.78 No.6
AIDS 환자에서 2차적인 중추신경계 기회감염은 전체 기회감염의 1/3 정도를 차지한다. 고효능 항바이러스 치료(highly active antiretroviral therapy, HAART)가 본격적으로 사용된 이후에 이러한 기회감염은 현저히 줄어들고 있으나, JC바이러스(JCV)에 의한 진행성 다발성 백질뇌병증(progressive multifocal leukoencephalopathy, PML)의 발생률은 줄어들지 않고 있다. 저자들은 국립의료원 감염병센터에서 경험하였던 7예의 진행성 다발성 백질뇌병증의 임상상을 조사하였다. HAART 후 PML 진단된 1예를 제외하고는 6예에서 PML진단 당시 HAART를 시행하지 않은 상태였다. 조사대상자의 중간 연령은 39세였다. 남자 6예, 여자 1예였다. 7예의 CD4림프구 개수는 각각 58, 6, 18, 73, 90, 252, 94 cells/μL이었고, 중간 CD4 림프구 개수는 84 cells/μL이었다. 가장 흔한 임상증상은 편측마비였으며, 호발부위는 측두엽이었다. 2예에서 진단 후 25일, 52일에 사망하였다. 3예에서 질환의 진행없이 1년 이상 생존하였다. HIV 감염자에게서 신경학적 증상이 있는 경우 이에 대한 적극적인 병력청취와 신경학적 검사, 뇌 자기공명영상 촬영이 필요하다. Secondary opportunistic central nervous system infections occur in approximately one-third of patients with acquired immune deficiency syndrome. With the introduction of highly active antiretroviral therapy, the number of opportunistic infection cases has significantly decreased. However, the number of progressive multifocal leukoencephalopathy (PML) cases caused by opportunistic human JC polyomavirus has not decreased at a noticeable rate. In this report, seven patients with PML were evaluated at the infectious disease unit of the National Medical Center. Six of the 7 patients were not on antiretroviral therapy at the time of diagnosis. The mean patient age of the 6 men and 1 woman was 39 years. The individual CD4 cell counts were 58, 6, 18, 73, 90, 252, and 94 cells/μL. The mean CD4 cell count was 84 cells/μL. The most common clinical manifestation was focal weakness and the temporal lobe was mainly involved. Two of the patients died 52 days after the diagnosis was made. Three patients survived for more than 1 year without disease progression. We conclude that one must take a careful patient history, perform a neurological examination, and examine brain magnetic resonance images in patients with human immunodeficiency virus who show neurological symptoms. (Korean J Med 78:771-775, 2010)