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비소 오염기간이 토양 내 비소의 존재형태와 식물독성에 미치는 영향
양우진,조은혜,임진우,정슬기,남경필,Yang, Woojin,Jho, Eun Hea,Im, Jinwoo,Jeong, Seulki,Nam, Kyoungphile 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.3
This study investigates effects of an aging period on arsenic (As) chemical forms in soils and phytotoxicity using artificially As-contaminated soils with a range of As concentrations (0-300 mg/kg) and aging periods (0 and 3 months). A sequential extraction procedure showed that the increasing As concentration in soils increased the ratio of non-specifically and specifically bound As, which are known to be bioavailable. This resulted in increasing As uptake by tomatoes with increasing As concentration (R<sup>2</sup>=0.87 for exponential fitting); however, the seed germination was not sensitive to the As concentrations of the soil samples. The seed germination was also statistically similar in the soils with 75 and 150 mg-As/kg regardless of the aging period. The time taken until the seed germination (i.e., lag phase), on the other hand, decreased from 10 d to 3 d with aging for 3 months. This can be attributed to the decreased amount of bioavailable As with aging. Overall, this study shows that when the toxic effects of the As-contaminated soils are assessed using tomato plants, it is better to use more sensitive methods than seed germination such as the As accumulation or the lag phase for seed germination.
비소제거효율이 향상된 식물상 정화공법의 현장적용가능성 평가
정슬기,문희선,양우진,남경필,Jeong, Seulki,Moon, Hee Sun,Yang, Woojin,Nam, Kyoungphile 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1
A siderophore-producing bacterium (i.e., Pseudomonas aeruginosa) capable of chelating Fe<sup>3+</sup> from its mineral form (i.e., iron oxides) was used to enhance As uptake by plants. Since As in soil is mainly associated with iron oxides, siderophore can play an important role in As mobilization through the dissolution of As-bearing iron oxides. A series of pot experiment using Pteris cretica showed that As removal by P. cretica with siderophore-producing bacteria addition increased more than three times compared to that without bacteria addition. Competition between indigenous bacteria and introduced bacteria (i.e., P. aeruginosa) was also observed, but such competition seemed not to be significant. This study suggests that enhanced-phytoremediation by siderophore-producing bacteria addition could be a visible option for longterm As removal in the forest area at the former Janghang smelter site.
분산 환경의 대규모 클러스터를 관리하기 위한 RISE 시스템의 설계 및 구현
박두식(Doosik Park),양우진(Woojin Yang),반민호(Minho Ban),정갑주(Karpjoo Jeong),이종현(Jonghyun Lee),이상문(Sangmoon Lee),이창성(Changsung Lee),신순철(Soonchurl Shin),이인호(Inho Lee) 한국정보과학회 2006 정보과학회논문지 : 시스템 및 이론 Vol.33 No.7
본 논문에서는 지리적으로 분산되어 있는 클러스터 시스템자원들을 효율적으로 활용하기 위한 3-tier 구조의 원격 설치 및 백업 방안을 소개한다. 최근에는 클러스터 시스템이 수백 노드 이상의 대규모 시스템이며, 공인망과 사설망이 혼재되는 복잡한 네트워크 환경으로 구성되고 있다. 따라서, 대규모 클러스터 시스템에 적합한 클러스터의 OS 설치와 원격지에서 클러스터 노드의 장애를 효과적으로 복구하는 것이 중요하다. 하지만 기존의 2-tier 구조의 클러스터 설치 및 이미지 백업 방법들은 공인망과 사설망으로 구성되어 있는 클러스터의 경우, 원격지에서 접근과 관리가 어렵다. 이러한 문제점을 해결하고자 본 논문에서는 3-tier 구조의 RISE(Remote Installation Service Environment) 시스템을 제안하고자 한다. RISE 시스템은 2-tier 구조의 마스터 노드 역할을 관리노드(GRISE)와 지역관리노드(LRISE)로 나누어 줌으로써 다양한 네트워크환경하에서 초기설치 및 장애 발생시 효과적으로 지원할 수 있으며, 관리노드와 지역관리 노드들의 동기화 기능을 통해 지역관리노드들의 안정성을 보장하고 있다. 64개 노드의 클러스터 시스템과 Gigabit 네트워크 시스템을 활용한 실험을 통하여, 1.86 GByte의 시스템 이미지를 5분 53초 안에 확보 할 수 있었고, 64개 노드 클러스터 시스템의 초기설치 작업을 평균 17분 38초 안에 완료할 수 있었다. In this paper, the way of remote installation and back-up of 3-tier structure is introduced for efficient utilizing the cluster system resources distributed at several places. Recently, cluster system is constructed as the system of over hundreds nodes under complex network system mixed with public networks and private networks. Therefore, the OS installation method suitable for the large scale cluster system and the remote recovery of failure nodes are important. However the previous researches which are based on 2-tier architecture may not provide the efficient cluster installation and image back-up method when the network of cluster system is composed of several private networks and public networks. In this paper, RISE (Remote Installation Service and Environment) based on the 3-tier architecture is proposed to solve this problem. In our approach, the managing node’s role is divided into the global master node (GRISE) and the local master node (LRISE) to provide the efficient initial system deployment and remote failure recovery of distributed cluster system under the various network systems. Also, LRISE’s availability is ensured under the complex network environments by adopting the auto-synchronization mechanism between GRISE and LRISE. In this work, a 64-node cluster system with gigabit network system is utilized for the experiment. From the experimental result, the system image with 1.86GB data can be obtained in 5 minutes and 53 seconds and the image-based installation of 64-node system can be carried out in 17 minutes and 53 seconds.
파이버에 부착되는 먼지의 동적 거동에 대한 CFD-DEM 해석
최재성(Jaesung Choi),양우진(Woojin Yang),김동주(Dongjoo Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The use of fibers for filtration is versatile and widely applied in various industries. In this study, particle-laden flow around two nearby fibers were simulated using CFD-DEM. Clogging was observed when both Stokes number and adhesion parameter were large. On the other hand, non-clogging was observed when they were small. In addition, the effect of fiber spacing on the clogging phenomenon was also investigated. Under the conditions where clogging was observed, reducing the fiber spacing reduced the time to reach cake filtration. Even in conditions where non-clogging was observed, decreasing the fiber spacing caused clogging.