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콘크리트 수축에 의한 급속경화궤도 균열 발생 가능성 검토
이성철 ( Lee Seong-cheol ),이동민 ( Lee Dongmin ),이경찬 ( Lee Kyoung Chan ),이일화 ( Lee Il-wha ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
In this paper, possibility of cracks in fast hardening track has been analyzed with consideration of shrinkage of fast hardening concrete. To evaluate tensile stress on fast hardening track, the analysis considers restrain effects by frictions due to subgrade and rail fastener. The analysis results indicated that the maximum tensile stress in fast hardening track increased as the continuous casting length of fast hardening concrete increased. To prevent cracks due to shrinkage, it was investigated that the continuous casting length be less than 66.9 m.
이동민 ( Lee Dongmin ),이성철 ( Lee Seong-cheol ),이경찬 ( Lee Kyoung Chan ),이일화 ( Lee Il-wha ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
In this paper, an experimental program has been conducted to investigate shrinkage of fast hardening concrete (FHC) which is used to replace the existing ballasted track with concrete track. In the test, curing method was considered as a test variable. The test results indicated that autogenous shrinkage was dominant on FHC while drying shrinkage was negligible. To represent shrinkage of FHC, a new model has been proposed through regression of the test results.
Exact Holography of Massive M2-brane Theories and Entanglement Entropy
Jang, Dongmin,Kim, Yoonbai,Kwon, O-Kab,Tolla, D. D.,Gwak, B.,Kang, G.,Kim, C.,Kim, H.-C.,Lee, C.-H.,Lee, J.,Lee, S.,Lee, W. EDP Sciences 2018 The European Physical Journal Conferences Vol.168 No.-
<P>We test the gauge/gravity duality between the <I>N</I> = 6 mass-deformed ABJM theory with U<I>k</I>(<I>N</I>) × U<I>-k</I>(<I>N</I>) gauge symmetry and the 11-dimensional supergravity on LLM geometries with <I>SO</I>(4)=ℤ<I>k</I> × <I>SO</I>(4)=ℤ<I>k</I> isometry. Our analysis is based on the evaluation of vacuum expectation values of chiral primary operators from the supersymmetric vacua of mass-deformed ABJM theory and from the implementation of Kaluza-Klein (KK) holography to the LLM geometries. We focus on the chiral primary operator (CPO) with conformal dimension Δ = 1. The non-vanishing vacuum expectation value (vev) implies the breaking of conformal symmetry. In that case, we show that the variation of the holographic entanglement entropy (HEE) from it’s value in the CFT, is related to the non-vanishing one-point function due to the relevant deformation as well as the source field. Applying Ryu Takayanagi’s HEE conjecture to the 4-dimensional gravity solutions, which are obtained from the KK reduction of the 11-dimensional LLM solutions, we calculate the variation of the HEE. We show how the vev and the value of the source field determine the HEE.</P>
Lee, Dongmin,Yu, Seong Gu,Park, Wooseok,Rhee, Cheul Korean Society of Food and Agricultural Informatio 2013 Agribusiness and Information Management Vol.5 No.2
As the consumers' anxiety for food increases, the interest in food safety also increases. To satisfy the public requirement on food safety, the government is trying to set up a food safety standard by using regulations and certification systems. However, there is still difficulty in building up complex traceability systems for medicinal crops including ginseng due to the low participation of farming industries. The purpose of this empirical research is to draw factors that impede the GAP adoption of ginseng farms. By comparing the average attitude and intention to adopt the ginseng farms' depending on its characteristics through a two-tailed test, it was drawn that continuous farming education can positively influence the GAP adoption of the ginseng farms.
Comparison of Ginseng Product Consumers Based on Processed Type of Ginseng
Lee, Dongmin,Yu, Seulgi,Moon, Junghoon Korean Society of Food and Agricultural Informatio 2015 Agribusiness and Information Management Vol.7 No.1
This study aims to analyze the differences of ginseng product consumers and segment Korean fresh ginseng and red ginseng root markets based on attributes for the purchase. As a result of analyzing survey data, the red ginseng root consumers had different aspects from fresh ginseng consumers. According to the result of cluster analysis, the fresh ginseng consumers were subdivided into three segments (safety-oriented consumption cluster, label centered consumption cluster, and high involvement consumption cluster), while the red ginseng root consumers were subdivided into four segments (convenience-oriented consumption cluster, high involvement consumption cluster, raw material's safety-oriented cluster, and raw material's information importance cluster). ANOVA and Crosstab were conducted to investigate characteristics of each cluster.
Uncoordinated tetrazole ligands in metal–organic frameworks for proton‐conductivity studies
Lee Daeyeon,Lee Sangho,Son Younghu,Kim Jun Yeong,Cha Seungheon,Kwak Dongmin,Lee Jooyeon,Kwak Jaesung,Yoon Minyoung,Kim Min 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.7
Zr-based metal–organic frameworks (MOFs) were modified with pendant tetrazole ligands for proton conductivity studies. Although tetrazolate ligands coordinated to metal cations have been widely utilized to construct MOFs or porous coordination polymers, to date, the use of uncoordinated tetrazole groups in MOFs has been limited. In this study, a benzene-1,4-dicarboxylic acid with pendant tetrazole groups (BDC-N4) was synthesized and used to prepare a Zr-based UiO-66 MOF using a mixed-ligand strategy. The tetrazolefunctionalized UiO-66-N4 was compared to MOFs containing other acidic functional groups (hydroxyl, carboxylic acid, and sulfonic acid) with respect to their proton conductivities and acidities (calculated pKa). Interestingly, UiO-66-N4 showed a significant decrease in the activation energy with increase in the amount of added tetrazole groups, suggesting the Grotthuss proton conduction mechanism for uncoordinated tetrazole-containing MOFs.