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물시료 대용량 현장추출을 위한 PUF-ACF-PUF 방식의 소형 포집장치 개발과 적용: I. 다이옥신류
문부식 ( Bu Shik Moon ),김윤석 ( Youn Seok Kim ),김용연 ( Yong Yeon Kim ),최재원 ( Jae Won Choi ) 한국환경분석학회 2009 환경분석과 독성보건 Vol.12 No.4
Compact type large volume filtration system using polyurethane foam (PUF) and active carbon felt (ACF) was developed for the field sampling of persistent organic pollutants (POPs). To overcome clogging by particles in compact sampler, exception of GFF in front of PUF plug was unavoidable. Active carbon felt (ACF) layers were added between PUF slices to make up trap efficiency. Recovery tests in the lab using tap and surface water resulted in corresponding ranges of QA/QC of the accredited method for PCDD/Fs. Next, field applications for 100L volume were carried out using compact large volume sampler (LVS) with triplicates and TEQs were compared with the concentrations by conventional LVS (FS-142K model). Similar concentrations for real samples were observed between newly developed compact LVS and commercial LVS. The compact sampler would be useful as a complementary options in field water sampling.
ANALYSIS OF THE VLASOV-POISSON EQUATION BY USING A VISCOSITY TERM
Boo-Yong Choi,Sun-Bu Kang,Moon-Shik Lee 충청수학회 2013 충청수학회지 Vol.26 No.3
The well-known Vlasov-Poisson equation describes plasma physics as nonlinear ¯rst-order partial di??erential equations. Be-cause of the nonlinear condition from the self consistency of the Vlasov-Poisson equation, many problems occur: the existence, the numerical solution, the convergence of the numerical solution, and so on. To solve the problems, a viscosity term (a second-order par-tial di??erential equation) is added. In a viscosity term, the Vlasov-Poisson equation changes into a parabolic equation like the Fokker-Planck equation. Therefore, the Schauder ¯xed point theorem and the classical results on parabolic equations can be used for analyz- ing the Vlasov-Poisson equation. The sequence and the convergence results are obtained from linearizing the Vlasove-Poisson equation by using a ¯xed point theorem and Gronwall s inequality. In nu- merical experiments, an implicit ¯rst-order scheme is used. The numerical results are tested using the changed viscosity terms.
ANALYSIS OF THE VLASOV-POISSON EQUATION BY USING A VISCOSITY TERM
Choi, Boo-Yong,Kang, Sun-Bu,Lee, Moon-Shik Chungcheong Mathematical Society 2013 충청수학회지 Vol.26 No.3
The well-known Vlasov-Poisson equation describes plasma physics as nonlinear first-order partial differential equations. Because of the nonlinear condition from the self consistency of the Vlasov-Poisson equation, many problems occur: the existence, the numerical solution, the convergence of the numerical solution, and so on. To solve the problems, a viscosity term (a second-order partial differential equation) is added. In a viscosity term, the Vlasov-Poisson equation changes into a parabolic equation like the Fokker-Planck equation. Therefore, the Schauder fixed point theorem and the classical results on parabolic equations can be used for analyzing the Vlasov-Poisson equation. The sequence and the convergence results are obtained from linearizing the Vlasove-Poisson equation by using a fixed point theorem and Gronwall's inequality. In numerical experiments, an implicit first-order scheme is used. The numerical results are tested using the changed viscosity terms.