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Lee, Jeong-Ho,Lee, Kicheol,Lee, Da Hyun,Shin, Soon Young,Yong, Yeonjoong,Lee, Young Han 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.4
The invasive potential of malignant tumor cells is critical for their metastasis. This study was undertaken to evaluate the anti-invasive activity of ${\beta}$-myrcene, a natural compound found in the essential oil from Pinus koraiensis cones (EOPC), in metastatic MDA-MB-231 human breast cancer cells. Among four major constituents that included ${\alpha}$-pinene, ${\beta}$-myrcene, 3-carene, and d-limonene, ${\beta}$-myrcene showed the most potent inhibition of tumor necrosis factor-${\alpha}$ ($TNF{\alpha}$)-induced nuclear factor ${\kappa}B$ (NF-${\kappa}B$) activity. Pretreatment with ${\beta}$-myrcene suppressed $TNF{\alpha}$-induced phosphorylation of inhibitor of ${\kappa}B$ kinase and NF-${\kappa}B$ as well as matrix metalloproteinase-9 (MMP-9) gene expression in a dose-dependent fashion. Furthermore, ${\beta}$-myrcene inhibited $TNF{\alpha}$-induced invasion of MDA-MB-231 cells as determined by three-dimensional spheroid invasion assays. These findings suggest that EOPC may promote anti-metastatic activity in breast cancer cells through its downregulation of NF-${\kappa}B$-mediated MMP-9 expression.
Numerical approach to assessing the contact characteristics of a polymer-based waterproof membrane
Lee, Kicheol,Kim, Dongwook,Chang, Soo-Ho,Choi, Soon-Wook,Park, Byungkwan,Lee, Chulho Elsevier 2018 Tunnelling and underground space technology Vol.79 No.-
<P><B>Abstract</B></P> <P>A waterproof membrane sprayed onto concrete enables faster construction compared with a conventional sheet membrane. The sprayed raw material, which is polymer mixed with water, becomes completely continuous waterproof thin membrane after a certain curing time. Such membranes have not been widely used in East Asia due to less confidence of their performance and limited applications despite of their outstanding structural properties and many projects in Europe, especially in the UK (at least 6 projects), which include higher cohesion at the interface and higher tensile strength. This study evaluates the material and contact properties of a waterproof membrane based on the results from laboratory experiments and numerical analyses. Interface properties of the waterproof membrane were calibrated from results of the linear block-support test proposed by European Federation of National Associations Representing for Concrete (EFNARC). A numerical model for simulating three-point bending tests was then developed and used to examine structural effects of the membrane. In results of numerical analysis, the contact conditions between the lining and the membrane had little effect in elastic behaviors, but tensile behavior of concrete lining had a relatively large effect.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Material property of sprayed waterproof membrane was experimentally and numerically evaluated. </LI> <LI> Interfacial property of sprayed waterproof membrane was assessed from linear block test results. </LI> <LI> Structural effects of sprayed waterproof membrane on concrete lining were analyzed. </LI> <LI> Interface property was well represented by cohesive contact model and damage criterion. </LI> <LI> Significant sprayed waterproof membrane effect on tensile behavior of lining was identified. </LI> </UL> </P>
팽창재료를 이용한 지하공동의 비개착식 긴급복구 공법에 대한 실내실험 및 수치해석
이기철(Kicheol Lee),최병현(Byeon-Ghyun Choi),박종호(Jongho Park),김동욱(Dongwook Kim) 한국지반신소재학회 2018 한국지반신소재학회 논문집 Vol.17 No.1
본 연구에서는 최근 도심지에서 발생하고 있는 지반함몰에 대하여 팽창재료를 이용한 긴급복구공법을 적용하고 이러한 공법의 적합성을 수치해석적으로 판단하고자 한다. 수치해석에 적용된 팽창재료의 특성을 평가하기 위하여 실내실험을 수행하였다. 실험으로 구한 팽창특성을 반영하여 다양한 공동 형상(직사각형 단면을 가지는 공동에 대하여 다양한 높이와 폭 조합)에 대하여 팽창재료를 적용하였을 경우 팽창재료 및 지반 거동을 평가하였다. 해석 결과, 공동의 상단과 하단의 연직변위는 공동의 높이보다는 공동의 폭에 큰 영향을 받으며, 공동 측면부의 수평변위는 공동 폭 보다는 공동의 높이의 영향을 많이 받는 것으로 나타났다. 또한, 팽창압이 작용하였을 경우 도로상부 표층의 수직변위량은 공동의 높이보다는 공동의 폭에 큰 영향을 받는 것을 확인할 수 있었다. The purpose of this study is to evaluate the suitability of emergency underground cavity restoration method filling cavity with expansive material based on numerical analysis. For the numerical analysis, experiments were conducted to evaluate properties of expansive material. Based on the measured expansion pressure of the expansive material from the experiment, behavior of underground cavity restoration with various cavity dimensions (variation of height and width of rectangular-shape cavity) was numerically assessed. As a result of analysis, the vertical displacements of the top and bottom of cavity were significantly influenced by the cavity width and lateral displacements of cavity sides were highly dependent on cavity height. These vertical and lateral displacements were increased with increasing expansion pressure of expansive material. Also, when the expansion pressure was applied, the vertical displacement of the upper surface layer of the road was less dependent on cavity height, and was greatly influenced by cavity width.