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김빛나래,조아현,남명진,Kim, Bitnarae,Cho, AHyun,Weller, Andreas,Nam, Myung Jin 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.2
Permeability-analyzing methods commonly involve small-scale drilling, such as pumping or slug test, but it is difficult to identify overall distribution of permeability of the entire target sites due to high cost and time requirement. Spectral induced polarization (SIP) method is known to be capable of providing distributions of both the porosity and the pore size, the two major parameters determining permeability of the porous medium. The relationship between SIP variables and permeability has been studied to identify the hydrological characteristics of target sites. Kozeny-Carman formula has been improved through many experiments to better predict fluid permeability with electrical properties. In this work, the permeability prediction techniques based on SIP data were presented in accordance with the hydrogeological and electrical characteristics of a porous medium. Following the summary of the techniques, various models and related laboratory experiments were analyzed and examined. In addition, the field applicability of the prediction model was evaluated by field case analysis.
흐름 전위 특성을 고려한 수리시설물에서의 자연 전위 탐사 사례 고찰
송서영,조아현,강경철,남명진,Song, Seo Young,Cho, AHyun,Kang, Peter K.,Nam, Myung Jin 한국지하수토양환경학회 2021 지하수토양환경 Vol.26 No.6
Self-potential (SP) surveys measure naturally occurring differences in electrical potential in the absence of artificial sources and have been applied to various fields since the first application in mineral explorations. Among various causes of SP occurrences, streaming potential is generated by the flow of groundwater, and makes SP surveys suitable for the exploration of groundwater table fluctuation, fractures, sinkholes and landslide occurrences. Recently, there has been many studies that applied SP surveys to monitor water leakage through dikes and embankments. In this review paper, we first review the characteristics and theoretical backgrounds of streaming potential in saturated or unsaturated porous media to introduce it in the embankment among various application field. After the review of the background theory, we review the past cases of field SP surveys on dikes and embankments and also the characteristics of field streaming potential data in the surveys. Further, by analyzing past studies of qualitative as well as quantitative interpretation of SP survey data, we show the possibility of quantitative interpretation of streaming potential data obtained on dikes and embankments. Consequently, it is hope that this review paper helps researches on SP surveys on dikes and embankments, and provides basis for interpretation methods of the SP data to identify leaked area and further leakage rate (or permeability).
김빛나래,유희은,조아현,송서영,조성오,정인석,남명진,Kim, Bitnarae,Caesary, Desy,Yu, Huieun,Cho, AHyun,Song, Seo Young,Cho, Sung Oh,Joung, Inseok,Nam, Myung Jin 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.2
Analyzing and monitoring environmental contaminants based on geophysical exploration techniques have become important and it is now widely applied to delineate spatial distribution geophysical characteristics in wide area. Among the techniques, induced polarization (IP) method, which measures polarization effects on electrical potential distribution, has drawn much attention as an effective tool for environmental monitoring since IP is sensitive to changes in biochemical reactions. However, various reactions stemming from the presence of multiple contaminants have greatly enhanced heterogeneity of polluted sites to result in highly variable electrical characteristics of the site. Those contaminants influence chemical and physical state of soil and groundwater to alter electrical double layer, which in turn influences polarization of the media. Since biochemical reactions between microbes and contaminants result in various IP effects, IP laboratory experiments were conducted to investigate IP responses of the contaminated soil samples under various conditions. Field IP surveys can delineate the spatial distribution of contamination, while providing additional information about electrical properties of a target medium, together with DC resistivity. Reviewing IP effects of contaminants as well as IP surveys can serve as a good starting point for the application of IP survey in site assessment for environmental remediation.
THOR 더미 흉부 압입시험 결과에 기반한 최적의 안전벨트 경로 제안
박현재(Hyunjae Park),조아현(Ahyun Cho),김태웅(Taewung Kim),조민기(Mingi Cho),이태희(Taehee Lee),이수열(Sooyul Lee),진욱(Wook Jin) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
This paper investigated an optimal belt path for minimizing maximum chest deflection of THOR-M50 dummy. To understand structural characteristics of the thorax region, a series of thorax compression tests were performed. Based on the test results, an optimal belt path, which path through the mid-point of the upper IR-TRACC was suggested. The optimal belt path, then, was verified through belt pull tests. Since the belt pull experiment was performed under a simplified static condition, the validity of the optimum belt path need to be verified under dynamic loading conditions such as sled or vehicle crash tests.