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백인우,김재곤,송영석,김태형 한국지반신소재학회 2020 한국지반신소재학회 논문집 Vol.19 No.2
This study determines the basic properties and acid rock drainage generation capacity of Pohang tertiary mudstone through laboratory experiments. According to X-ray fluorescence (XRF) analysis results, the mudstone of this area mostly comprised of with a proportion of approximately 60%, followed in order by and . As such, it is clear that there is an abundance of aluminosilicates with a high probability of generating acid rock drainage. The XRD analysis showed that the mudstone contains pyrite ( ), it is highly likely to generate acid rock drainage, and inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis results showed that the mudstone samples contained a high amount of ions. As a result of anion analysis measured by ion chromatography (IC), all mudstone samples were measured to have high concentrations. According to elemental analysis, the total sulfur (S) content was high, which in turn indicates a high risk of acid rock drainage generation reflected by a maximum potential acidity (MPA) higher than 1%. All in all, although there were slight deviations between the tertiary mudstone samples, overall, the samples exhibited high acid rock drainage generation capacities. 본 연구에서 포항 제3기 이암의 실내시험을 통해 기본적인 특성과 산성배수 발생능력을 파악하였다. XRF 분석 결과 성분이 약 60%로 가장 많이 포함되어 있으며, 다음으로 와 순으로 산성배수 발생 개연성이 높은 산화물이 많이존재함을 알 수 있다. XRD 분석 결과 이암이 황철석( )을 포함하고 있어 산성배수 발생 개연성이 높은데, 유도결합플라즈마 분광분석기(ICP)로 분석 결과에서도 이암 시료에서 이온이 높게 측정되었다. 이온 크로마토그래피(IC)로 측정한음이온 분석 결과 모든 이암 시료 농도가 높게 측정되었다. 원소 분석결과 총 황(S) 함량이 높아 최대 산 발생량(MPA) 계산 결과 1% 이상으로 산성배수 발생 위험이 높게 나타났다. 결론적으로 제3기 이암은 시료에 따라 다소 차이가 있으나전반적으로 산성배수 발생능력이 높은 것으로 나타났다.
포항분지 제3기 이암의 도로 노체 활용을 위한 현장시험
공정식(Jeong-Sik Gong),백인우(In-Woo Baek),김재곤(Jae-Gon Kim),송영석(Young-Suk Song),김태형(Tae-Hyung Kim) 한국지반신소재학회 2021 한국지반신소재학회 논문집 Vol.20 No.3
본 연구는 성토구조체 현장실험을 통해 포항 지역의 제3기 이암을 도로 노체 재료로 활용하기 위한 가능성을 검토하는 제시하는 것이다. 이 이암은 신생대 제 3기층인 연암퇴적층에 분포하고 있는 미고결화 암석으로 슬레이킹, 팽윤 현상, 전단강도 저하와 같은 물리적 문제와 산성배수라는 화학적 문제가 발생한다. 여러 복합적 문제 해결하기 위해 실내 배합 시험을 진행하였으며 제 3기 이암(90%)과 복합슬래그(제강 70%, 고로 30%)와 중화・코팅제 처리의 최적 배합 조건을 도출했으며, 이를 실증하기 위해 실제 규모의 도로 성토구조체를 시공하여 구간별 현장 시험을 진행했다. 사전처리구간은 최적 배합 조건 설계로 인해 안정이 유지되는 반면, 무처리구간은 자연 풍화가 빠르게 진행되어 구조적 문제 발생이 우려되었으며, 가적치구간은 중화・코팅제 효과가 확인됨에 따라 임시 적치 시기에 적용 가능함을 확인했다. The purpose of this study is to present the possibility a utilization of the tertiary mudstone in Pohang as road subsoil material through pilot experiments on the road embankment structure. This mudstone is an unconsolidated rock that is distributed in the soft rock sedimentary layer, the tertiary layer of the Cenozoic, and causes physical problems such as slaking, swelling, and reduced shear strength and chemical problem like acid drainage. In order to solve various complex problems, an laboratory mixing test was conducted, and the optimal mixing conditions of the tertiary mudstone (90%), composite slag (steel making 70%, blast furnace 30%), and neutralization and coating agent treatment were derived. In order to prove its utilization, a real-scale road embankment structure was constructed and tests were conducted for each section. The pre-processing section is stable due to the design of optimal mixing conditions, while in post-processing section, natural weathering proceeded rapidly, and structural problems were concerned. Since the effect of neutralizing and coating agents was confirmed in temporary-staking section, the neutralizing and coating agents can be applied during the temporary storage period.
UBCG: Up-to-date bacterial core gene set and pipeline for phylogenomic tree reconstruction
나성인,김영욱,윤석환,하성민,백인우,천종식 한국미생물학회 2018 The journal of microbiology Vol.56 No.4
Genome-based phylogeny plays a central role in the future taxonomy and phylogenetics of Bacteria and Archaea by replacing 16S rRNA gene phylogeny. The concatenated core gene alignments are frequently used for such a purpose. The bacterial core genes are defined as single-copy, homologous genes that are present in most of the known bacterial species. There have been several studies describing such a gene set, but the number of species considered was rather small. Here we present the up-to-date bacterial core gene set, named UBCG, and software suites to accommodate necessary steps to generate and evaluate phylogenetic trees. The method was successfully used to infer phylogenomic relationship of Escherichia and related taxa and can be used for the set of genomes at any taxonomic ranks of Bacteria. The UBCG pipeline and file viewer are freely available at https://www.ezbiocloud.net/ tools/ubcg and https://www.ezbiocloud.net/tools/ubcg_viewer, respectively.