Reduction of Heavy Metals and Organic Materials by Atomized Slag Barrier in Contaminated Groundwater

정혁상,박종식,이용주,김상근,공진영,천병식,유재석 대한토목학회 2013 KSCE Journal of Civil Engineering Vol.17 No.7

Atomized slag is a residual waste product of steel manufacturing. The use of atomized slag as a recycled material is widespread in Korea, especially for filter media, ceramic filters, coagulate, construction materials, abrasives, and desulfurizing agents. The absorptivity of atomized slag as a reactive media for a permeable reactive barrier to eliminate pollutants inflowing from landfills was investigated in this study. Physical tests were performed to analyze the engineering properties of the atomized slag. The absorptive performance of the atomized slag against heavy metals and organics was examined in batch and column tests. Pilot-scaled and field tests were performed and monitored to evaluate the absorptivity of the atomized slag in the permeable reactive barrier against heavy metals and organics. The pilot-scaled test results showed the removal efficiencies of more than 94.9% for organics and more than 99.9% for heavy metals passing into the atomized media. The field test results indicated that the removal efficiencies of the atomized slag applied in the permeable reactive barrier were measured to be from 82 to 85% for organics and from 90 to 95% for heavy metals. The implications of the results are discussed.

우리기술개발(주)

정혁상 대한토목학회 2021 대한토목학회지 Vol.69 No.2

수치해석을 통한 보강토옹벽 직선부와 곡선부의 거동 특성

정혁상 한국지반신소재학회 2017 한국지반신소재학회 논문집 Vol.16 No.4

본 논문은 보강토옹벽의 곡선부 거동을 수치해석으로 분석한 내용을 다루고 있다. 보강토옹벽은 토목섬유의 발전과 함께발달해왔다. 기존의 콘크리트 옹벽과 달리 성토 높이에 제약을 받지 않고 안정성을 확보할 수 있다는 장점이 있으며, 현재산업 및 주거단지를 형성하는데 많이 사용되고 있다. 이러한 보강토옹벽의 설계는 현재 다른 형식의 옹벽 설계와 동일하게내・외적 안정성 검토 및 보강재의 인장력에 대한 검토를 활용하여 이루어지고 있으며, 주로 2차원 수치해석을 바탕으로 이루어지고 있다. 그러나 기존의 연구결과에 따르면, 보강토옹벽의 취약부는 곡선부로 보고되고 있으며, 이는 실내모형시험 및피해사례에 대한 연구에서 언급된 바 있다. 보강토옹벽의 곡선부 거동을 파악하기 위한 2차원 수치해석은 그 한계점을 분명히드러내고 있으며, 실내모형시험 및 현장시험 또한 그 거동과 파괴메커니즘을 이해하기에는 그 한계를 갖고 있다. 따라서 본연구에서는 보강토옹벽의 곡선부의 거동을 이해하기 위해 3차원 수치해석을 수행하였으며, 수치해석에서의 직선부와 곡선부의 결과를 비교・분석하였다. 뿐만 아니라, 상재하중의 고려 여부 및 성토체의 다짐도를 달리하여 각각의 조건에서의 거동특성을 비교・분석하였다. This paper deals with numerical analysis of behavior of curved mechanically stabilized earth(MSE) walls with geosynthetics reinforcement. Unlike typical concrete retaining walls, MSE wall enables securing stability of higher walls without being constrained by backfill height and is currently and widely used to create spaces for industrial and residential complexes. The design of MSE walls is carried out by checking external stability, similarly to the external checks of conventional retaining wall. In addition, internal stability check is mandatory. Typical stability check based on numerical analysis is done assuming 2-dimensional condition (plane strain condition). However, according to the former studies of 3-dimensional MSE wall, the most weakest part of a curved geosynthetic MSE wall is reported as the convex location, which is also identified from the studies of the laboratory model tests and field monitoring. In order to understand the behaviour of the convex location of the MSE wall, 2-dimensional analysis clearly reveals its limitation. Furthermore, laboratory model tests and field monitoring also have restriction in recognizing their behaviour and failure mechanism. In this study, 3-dimensional numerical analysis was performed to figure out the behaviour of the curved part of the geosynthetic reinforced wall, and the results of the straight-line and curved part in the numerical analysis were compared and analysed. In addition, the behaviour characteristics at each condition were compared by considering the overburden load and relative density of backfill.

비파괴법을 활용한 격자지보의 성능평가 기법 제안

정혁상,Jung, Hyuk-Sang 한국터널지하공간학회 2016 한국터널지하공간학회논문집 Vol.18 No.5

본 논문은 비파괴 기법을 활용한 격자지보재의 품질평가 기법에 대한 내용을 다루었다. 일반적인 격자지보재의 성능평가는 강재의 인장강도시험과 육안조사로 이루어진다. 강재의 인장강도시험은 현장에 반입되는 격자지보의 시편을 확보하여 수행하게 되는데 이때 시편 확보를 위해 격자지보재를 훼손시켜야하는 단점을 가지고 있고 대부분의 현장에서는 인장강도시험기를 보유하고 있지 않아 시험인증기관에 의뢰해야하는 불편함을 가지고 있다. 또한 강재 생산시 발행된 성적서(Mile sheet)로 대체하기도 하나 이는 신뢰성이 결여될 수 밖에 없다. 더욱이 현장에서의 육안조사는 신뢰성이 결여되는 문제점을 가지고 있기 때문에 현장에서 자재의 훼손없이, 쉽고 빠르게 격자지보재의 품질을 평가할 수 있는 방법이 필요하게 되었다. 따라서 본 연구에서는 동일 시편에 대한 인장강도시험의 항복강도와 계장화압입시험의 항복강도를 비교 분석하여 비파괴시험법의 적용성을 분석하였다. 시험결과 계장 화압입시험은 95%이상의 정밀도를 보였으며 현장에서 성능평가가 가능한 계장화압입시험에 의한 품질평가기법을 제안하고자 한다. This paper dealt with contents of the quality evaluation method of lattice girder utilizing non-destructive method. Quality evaluation of ordinary lattice girder is performed through the tensile strength test of structural steel and visual inspection. The tensile strength test of structural steel is performed by collecting samples of lattice girder brought into the site, during which lattice girder must be damaged to obtain sample. In addition to such disadvantage, tensile strength tester is not available at the site in most cases, requiring an inconvenient service from test certification agency. In addition, it is substituted by mile sheet issued during the production of structural steel, which inevitably lacks reliability. Furthermore, visual inspection at the site entails a problem of lack of reliability, thereby requiring a method of easily and quickly evaluating the quality of lattice girder without damaging the material. Accordingly, this study comparatively analyzed the yield strength of tensile strength test and the yield strength of instrumented indentation test with same sample. The test results ensured over 95% precision level for the instrumented indentation test, based on which a quality evaluation method based on instrumented indentation test that allowed onsite direct quality evaluation is proposed.

『醫學入門』 五臟系에 대한 解剖學的 考證

정혁상,백유상,김도훈,정창현,장우창 대한한의학원전학회 2017 대한한의학원전학회지 Vol.30 No.1

Objectives : The paper attempted to analyze the contents found in the networks of five viscera in Yixuerumen’s Zangfutiaofen published by Li Chan in 1575, and tried to reveal the body structure dealt in the contents through anatomical verification. Methods : Books such as Huataxianshengneizhaotu, Tushupian, and Shisijingfahui were used to compare, understand, and interpret the original texts and annotations of Yixuerumen in an attempt to verify these through anatomy reference texts and computer programs. Results : In Yixuerumen, some contents of the networks of five viscera were revised to see feixi as not one but two, and explained the relationship of intestinal organs through heart and lung. Anatomically speaking, the networks of five viscera has a vertical structure that unfolds top to bottom centering on aorta, and has many organs connected to it such as trachea, esophagus, splenic artery, pulmonary trunk, ureter, mesentery arteriovenous, gonadal artery, and ductus deferens. Conclusions : The networks of five viscera has a great significance in that it is the fruit of much efforts where oriental medicine tried to explain not only the functions of five viscera, but also the creation and circulation of qi, blood, and bodily fluids through anatomical observation.

우리나라 철도산업의 현황과 전망

정혁상 한국지반환경공학회 2015 한국지반환경공학회 학술발표회논문집 Vol.2015 No.09

강재 품질에 따른 격자지보재의 성능평가

정혁상,신영완,송기일,신종호,Jung, Hyuk-Sang,Shin, Young-Wan,Song, Ki-Il,Shin, Jong-Ho 한국터널지하공간학회 2016 한국터널지하공간학회논문집 Vol.18 No.2

본 논문은 격자지보재의 규격자재와 비규격자재의 성능평가에 대한 내용을 다루었다. 격자보재는 강봉으로 제작된 아치형의 터널지보공을 말하며 터널 굴착시 지반의 변형을 최대로 억제하여 터널의 안정성을 확보하기 위하여 사용되어지는 지보재이다. 이런 격자지보재의 성능평가는 휨강도시험과 인장강도시험을 통해 평가할 수 있으며 터널표준시방서에서는 항복강도 500MPa 이상인 용접용 강재를 사용도록 규정하고 있다. 그러나 저품질의 강재가 사용될 경우 현장에서 규격자재와 비규격자재를 육안으로 구분하기 어렵게 되었다. 따라서 본 논문에서는 격자지보재의 규격자재와 비규격자재에 대한 성능평가를 실시하여 비규격자재의 항복강도 저하의 문제점을 분석하였다. This paper dealt with contents on the performance evaluation of standardized steel and non-standardized steel of lattice girder. Lattice girder is arch type tunnel supports made of structural steel bar and it is girder used to ensure the stability of tunnel by suppressing any transformation of ground as much as possible during tunnel excavation. The performance evaluation of lattice girder can be conducted through bending strength test, tensile strength test and tunnel standard specification specifies that welding structural steel with over 500MPa yield strength shall be used. However, it is difficult to distinguish visually between standardized steel and non-standardized steel onsite if low-quality structural steel is used. Accordingly, this paper conducted performance evaluation of standardized steel and non-standardized steel of lattice girder to point out the issue of deteriorated yield strength of non-standardized steel, while proposed a method of verifying yield strength onsite.

홍경천(紅景天)추출물(KH101)이 강제유영 흰쥐의 피로회복에 미치는 영향

정혁상,김은영,심은섭,이현삼,문은정,김진화,김선여,손영주,손낙원,Jung, Hyuk-Sang,Kim, Eun-Young,Shim, Eun-Sheb,Lee, Hyun-Sam,Moon, Eun-Jung,Jin, Zhen-Hua,Kim, Sun-Yeou,Sohn, Young-Joo,Sohn, Nak-Won 대한한방내과학회 2008 大韓韓方內科學會誌 Vol.29 No.4

Objectives : Rhodiola rosea has been used in herbal medicine to treat various conditions, such as antimelancholia, antifatigue, improvement of work competence and prevention of altitude sickness. In this study, we investigated effects of Rhodiola rosea extract (KH101) on fatigue in forced swimming rats. Methods : Sprague-Dawley rats were induced with fatigue by forced swimming, then rats in each group were treated with KH101. We observed changes of glucose, LDH and cortisol in serum and LDH, glycogen, hexokinase, citrate synthase MDH, SDH and CK in muscle. Results : Obtained results were as follows: 1. Continuance times of exercise significantly increased in all groups at day 1, in the 50 mg/kg concentration group at day 2, in all groups at day 3 and in the 50 mg/kg conc. group at day 4. 2. In serum, glucose significantly decreased in all concentration groups. 3. In the soleus muscle, LDH significantly decreased in the 50 mg/kg concentration group. HK significantly decreased in the 100 mg/kg conc. group. SDH significantly increased in the 100 mg/kg conc. MDH were significantly decreased in all conc. groups. 4. In the gastrocnemius muscle, HK significantly decreased in all concentration groups, while MDH significantly increased all conc. groups. Conclusions : It is concluded that the KH101 has and anti-fatigue effect in rats. Additional studies are needed to find the mechanism of the association between each single herb.

국제 학술행사 안내

정혁상 대한토목학회 2015 대한토목학회지 Vol.63 No.12

교차터널의 보강영역에 관한 연구

정혁상 한국지반환경공학회 2011 지반환경 Vol.12 No.5