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전대영,Jeon, Dae-Young 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.5
본 연구에서는 부산지역 지하수수질측정망 80개소를 대상으로 방사성물질의 특성을 연구하였다. 우라늄의 전체 평균 농도는 $4.33\;{\mu}g/L$이였고, 최대 평균농도는 $171.55\;{\mu}g/L$이였다. 미국 먹는물기준인 $30\;{\mu}g/L$을 초과한 곳은 1곳, WHO 권고기준인 $15\;{\mu}g/L$을 초과한 곳은 4곳으로 나타났다. 라돈의 전체 평균농도는 169 pCi/L이였고, 최대 평균농도는 1,850 pCi/L이였다. 미국 먹는물기준인 4,000 pCi/L WHO 권고기준인 2,700 pCi/L을 초과한 곳은 단 한곳도 없었다. 전알파의 전체 평균농도는 0.3pCi/L이였고 최대 평균농도는 6.9 pCi/L로 다른 방사성물질에 비하여 미미한 수준으로 나타났다. 지하수중에서 방사성물질의 평균 농도는 낮은 편이지만 미량이나마 검출되는 바 국민건강상 위해를 예방하기 위하여 먹는물 수질기준 둥 관리대책 마련의 필요성이 요구된다. 또한 우라늄이 고농도로 검출되는 일부 지점에 대해서는 정밀한 검토를 거쳐 폐공 조치 등 적절한 조치가 필요할 것으로 판단된다. This study was performed to research the characteristic of radionuclides of 80 groundwater monitoring networks in Busan. According to the research, average concentration of Uranium was $4.33\;{\mu}g/L$, maximum concentration of Uranium was $171.55\;{\mu}g/L$ among the 80 sampling sites. One sample exceeded the Proposal standard of drinking water in USA in Uranium ($30\;{\mu}g/L$) and four samples exceeded the recommendatory value of WHO about Uranium ($15\;{\mu}g/L$). Radon and gross-$\alpha$ concentration of all samples were far less than the Proposal standard of drinking water in USA. In this study average concentration of radionuclides in underground water wasn't too high, but needed to control the concentration of them to prevent exposure to the people. And it needs to be taken measures in some sites with high concentration of Uranium by closing the pipe line or etc through more studies.
효율적인 저마하수 유동 음향 포착을 위한 OpenFOAM 기반의 압력기반 압축성 해석자 분석
전대영,이복직 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.4
For efficient capturing of low-Mach flow acoustics, a compressible pressure-based semi-implicit algorithm with characteristic splitting is implemented on the OpenFOAM framework. In this paper, detailed descriptions of the OpenFOAM code for SICS algorithms were shown and a comparison study of semi-implicit characteristic splitting (SICS) and compressible PIMPLE algorithm was performed. To validate SICS solver, the aeolian tone of the cylinder was simulated and the corresponding acoustic pressure was compared with the previously reported value. To evaluate pressure-based solver performance, acoustic wave propagation and scattering problems were simulated. It is found that a pressure-based solver with SICS algorithm shows better cost-effective performance on low-Mach flow acoustics than a solver with a compressible PIMPLE algorithm. The present SICS solver was extended to reacting flow and one-dimensional flame structures were resolved correctly. The SICS solver can be used to simulate flame-acoustic coupling of low-Mach flow more efficiently.
수질, 저서성 대형무척추동물 및 어류의 생태특성을 이용한 수영강 중류 수생태 건강성 평가
전대영 ( Dae Young Jeon ),이소림 ( So Lim Lee ),손정원 ( Jung Won Son ),차영욱 ( Young Uk Cha ),권기원 ( Ki Won Kwon ),유평종 ( Pyung Jong Yoo ) 한국물환경학회 2010 한국물환경학회지 Vol.26 No.6
Bentic macroinvertebrate and fish fauna were investigated from September 2008 to October 2009 in the middle reach of the Suyoung river in Busan. During the survey period benthic macroinvertebrates were collected total 35 species at the three sites (Hanmul-gyo, Dongcheon-gyo, Seokdae Jct.) of Suyoung river. At that sites, species diversity index was 1.9, 1.5, 1.6, dominance index was 0.75, 0.81, 0.86 and Korean Saprobic Index (KSI) was 1.8(B), 4.4(D), 4.4(D) on average, respectively. Dominant species was Caenis Kua, Chironomidae sp., at Hanmul-gyo site and Limnodrilus gotoi, Chironomidae sp., at Dongcheon-gyo and Seokdae Jct. sites. Fish fauna was also investigated at the two sites (Hanmul-gyo and Seokdae Jct.) of Suyoung river. Total caught fishes were 10 species 32 individuals in the first survey and 6 species 26 individuals in the second survey. Dominant species was Carassius auratus in the both surveys. Index of Biological Integrity (IBI) value was C grade at the Hanmul-gyo and D grade at the Seokdae Jct.
OpenFOAM 기반의 적응형 격자 세밀화 기법을 적용한 연소해석
전대영(Daeyoung Jun),이복직(Bok Jik Lee) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1
A numerical study on the application of OpenFOAM-based adaptive mesh refinement (AMR) to combustion problems was carried out by comparing the regular and AMR solutions. In the present study, an OpenFOAM-based solver for reacting Navier-Stokes equations with load-balanced AMR was adopted to solve a laminar methane/air coflow diffusion flame (steady case) and a premixed flame with flame propagation instability (unsteady case). For a steady case, the AMR approach was able to reproduce the flame structure of the laminar coflow diffusion flame successfully with the same accuracy of the solution using a uniform fine mesh. For an unsteady case, the simulation using AMR captured the flame propagation instability reproducing the flame position along time in good agreement compared to the simulation using a uniform fine mesh. In terms of computational cost, simulations using AMR with load balancing took about one-third of the simulations using uniform fine meshes. It is found that OpenFOAM-based AMR was efficient to be applied to the selected combustion problems of both steady and unstready cases with a significant reduction of computational cost without the loss of accuracy in the solutions.