해상교량의 교각에 대한 설계선박 결정

이성로,배용귀 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

An analysis of the annual frequency of collapse(AF) is performed for each maritime bridge pier exposed to ship collision. From this analysis, the impact lateral resistance can be determined for each pier. The bridge pier impact resistance is selected using a probability-based analysis procedure in which the predicted annual frequency of bridge collapse, AF, from the ship collision risk assessment is compared to an acceptance criterion. The analysis procedure is an iterative process in which a trial impact resistance is selected for a bridge component and a computed AF is compared to the acceptance criterion, and revisions to the analysis variables are made as necessary to achieve compliance. The distribution of the AF acceptance criterion among the exposed piers is generally based on the designer's judgement. In this study, the acceptance criterion is allocated to each pier using allocation weights based on the previous predictions. To determine the design impact lateral resistance of bridge components such pylon and pier, the numerical analysis is performed iteratively with the analysis variable of impact resistance ratio of pylon to pier. The design impact lateral resistance can vary greatly among the components of the same bridge, depending upon the waterway geometry, available water depth, bridge geometry, and vessel traffic characteristics. More researches on the allocation model of AF and the determination of impact resistance are required.

해상교량의 설계선박 선정 비교 연구

이성로,이병화 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

In this study ship collision risk analysis is performed to determine optimization of design vessel for collision impact analysis of the maritime bridge. methodⅡ which is a probability based analysis procedure is used to select the design vessel for collision impact from the risk analysis results. The analysis procedure, an iterative process in which a computed annual frequency of collapse(AF) is compared to the acceptance criterion, includes allocation method of acceptance criterion of annual frequency of bridge component collapse. The AF allocation by weights seems to be more reasonable than the pylon concentration allocation method because this AF allocation takes the design parameter characteristics quantitatively into consideration although the pylon concentration allocation method brings more economical results when the overestimated design collision strength of piers compared to the strength of pylon is moderately modified.

이순신 대교 인근의 풍관측자료에 의한 풍환경 평가

한관문(Han Gwan Mun),신윤재(Shin Yun Jae),이성로(Lee Seong Lo) 대한토목학회 2008 대한토목학회 학술대회 Vol.2008 No.10

p34SEI-1 Inhibits Doxorubicin-Induced Senescence through a Pathway Mediated by Protein Kinase C-{delta} and c-Jun-NH2-Kinase 1 Activation in Human Breast Cancer MCF7 Cells.

Lee, Sae Lo Oom,Hong, Seung-Woo,Shin, Jae-Sik,Kim, Jin Sun,Ko, Seong-Gyu,Hong, Nam-Joo,Kim, Dae Jin,Lee, Wang-Jae,Jin, Dong-Hoon,Lee, Myeong-Sok American Association for Cancer Research 2009 Molecular Cancer Research Vol.7 No.11

<P>In this study, we describe a novel function of the p34(SEI-1) protein, which is both an oncogenic protein and a positive regulator of the cell cycle. The p34(SEI-1) protein was found to inhibit doxorubicin-induced senescence. We investigated the molecular mechanisms of the inhibitory effect of p34(SEI-1) on senescence. First, we found that the activation of protein kinase C-delta (PKC-delta), which is cleaved into a 38 kDa active form from a 78 kDa pro-form, induced after doxorubicin treatment, was inhibited by p34(SEI-1). Furthermore, p34(SEI-1) induced the ubiquitination of PKC-delta. Yet, there is no interaction between p34(SEI-1) and PKC-delta. We also found that the phosphorylation of c-Jun-NH(2)-kinase 1 (JNK1) induced after doxorubicin treatment was suppressed by p34(SEI-1), but not in JNK2. Consistently, pharmacologic or genetic inactivation of either PKC-delta or JNK1 was found to inhibit doxorubicin-induced senescence. In addition, the genetic inactivation of PKC-delta by PKC-delta small interfering RNA resulted in an inhibition of JNK1 activation, but PKC-delta expression was not inactivated by JNK1 small interfering RNA, implying that the activation of JNK1 could be dependently induced by PKC-delta. Therefore, p34(SEI-1) inhibits senescence by inducing PKC-delta ubiquitination and preventing PKC-delta-dependent phosphorylation of JNK1. [Mol Cancer Res 2009;7(11):1845-53].</P>

Effects of drawing process on the structure and tensile properties of textile-grade PAN fiber and its carbon fiber

Lee, Hwayoung,Lee, Lo-Woon,Lee, Seung-Wook,Joh, Han-Ik,Jo, Seong-Mu,Lee, Sungho Walter de Gruyter GmbH 2014 E-Polymers Vol.14 No.3

<B>Abstract</B><P>Carbon fibers (CFs) were prepared using low-cost, textile-grade polyacrylonitrile fibers, which were 200% to 400% drawn in a hot water bath at 90°C or/and in a tubular furnace at 180°C. X-ray diffractograms confirmed that the drawing process led to higher crystallinity and molecular orientation. These fibers were stabilized in a convection oven at 25-255°C for 390 min. After stabilization, carbonization was performed to obtain carbon fibers. The tensile strength of CFs without drawing was ∼0.8 GPa; however, CFs with 200% and 200% drawing in a hot water bath at 90°C and in a tubular furnace at 180°C, respectively, showed a tensile strength of ∼1.7 GPa. These results suggest that the drawing process of precursor fibers affected the tensile properties of the resulting CFs significantly.</P>

현수교의 선박충돌 위험 및 설계선박하중

이성로(Lee Seong Lo),배용귀(Bae Yong Gwi) 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.1A

본 연구에서는 현수교의 선박충돌해석을 위한 설계선박을 결정하기 위하여 선박충돌위험도해석을 수행한다. 선박충돌에 대한 설계선박을 결정하기 위하여 AASHTO 설계기준에서 제시한 3개의 선박충돌 설계방법 중 확률기반 해석방법인 Method Ⅱ를 사용한다. 선박충돌 위험에 노출된 각각의 교각에 대해 선박충돌위험도 평가를 하여 교각의 충돌설계수평강도를 결정한다. 해석과정은 반복적인 것으로 교량부재의 충돌저항강도를 가정하고 연간파괴빈도를 계산하여 허용기준이 만족하도록 설계 변수를 수정한다. 허용기준은 예상연간파괴빈도에 근거한 가중치를 이용하여 교각에 할당한다. 해석결과에서 안전성과 경제성을 얻기 위해 이 할당방법을 주탑집중 할당방법과 비교한다. 비록 주탑집중 할당방법이 주탑에 비해 과대평가되는 교각의 설계수평강도를 적절히 수정할 경우 보다 경제적인 결과를 가져오지만, 가중치에 의한 할당방법이 설계인자의 특성을 정량적으로 고려하기 때문에 더 합리적인 것으로 보인다. 그리고 선박충돌위험도 평가로부터 얻어지는 충돌설계수평강도에 상응하는 각각의 교각에 대한 설계선박이 결정된다. 같은 교량에 대해서도 충돌설계수평강도가 수로 및 교량의 특성과 선박통행량에 따라 상당히 변화한다. 따라서 허용기준의 할당과 설계선박 선정에 대한 많은 연구가 요구된다. In this study ship collision risk analysis is performed to determine the design vessel for collision impact analysis of suspension bridge. Method Ⅱ in AASHTO LRFD bridge design specifications which is a more complicated probability based analysis procedure is used to select the design vessel for collision impact. From the assessment of ship collision risk for each bridge pier exposed to ship collision, the design impact lateral strength of bridge pier is determined. The analysis procedure is an iterative process in which a trial impact resistance is selected for a bridge component and a computed annual frequency of collapse(AF) is compared to the acceptance criterion, and revisions to the analysis variables are made as necessary to achieve compliance. The acceptance criterion is allocated to each pier using allocation weights based on the previous predictions. This AF allocation method is compared to the pylon concentration allocation method to obtain safety and economy in results. This method seems to be more reasonable than the pylon concentration allocation method because AF allocation by weights takes the design parameter characteristics quantitatively into consideration although the pylon concentration allocation method brings more economical results when the overestimated design collision strength of piers compared to the strength of pylon is moderately modified. The design vessel for each pier corresponding with the design impact lateral strength obtained from the ship collision risk assessment is then selected. The design impact lateral strength can vary greatly among the components of the same bridge, depending upon the waterway geometry, available water depth, bridge geometry, and vessel traffic characteristics. Therefore more researches on the allocation model of AF and the selection of design vessel are required.

교량 및 수로 조건에 따른 선박충돌 위험도 분배모델의 적용

이성로 ( Lee Seong-lo ),배용귀 ( Bae Yong-gwi ),전주완 ( Jeon Ju-wan ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1

In the standards or regulations mentioned regarding the ship collision against bridge, acceptance criterion about collapse risk is given to bridges exposed to ship collision. It recommends to distribute collision risk through moderate method as well as to determine the analysis domain considering the ship characters and local circumstance. According to the criteria collision risk should be distributed within three times of ship’s overall length which is based on historical accident data, and besides, the summation of annual frequency of all bridge components should be equal to annual frequency of entire bridge. In this study, methodological study regarding the annual frequency of between bridge components and entire bridge is preformed and its reasonable correlation is presented considering the ship characters, bridge layout, local circumstance, and so on.

교량의 선박충돌위험도 평가 (Ship Collision Risk Assessment for Bridges)

이성로(Lee Seong Lo),배용귀(Bae Yong Gwi) 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.1A

선박충돌의 위험이 있는 교량의 교각에 대해 연파괴빈도 계산을 수행하였다. 이러한 해석을 통해 각각의 교각에 대한 선박충돌 수평내하력을 결정할 수 있다. 교각의 수평내하력은 선박충돌 위험도 평가로부터 예측된 연파괴빈도와 허용기준을 비교하는 확률기반 해석과정을 통해 결정된다. 해석과정은 교량 각 부재요소에 대한 초기 충돌저항력을 가정하여 계산된 연파괴빈도가 허용기준을 만족하도록 해석변수를 반복 수정하면서 해를 찾는 과정이다. 일반적으로 선박충돌 위험이 있는 교각들에 대한 연파괴빈도 허용기준의 분배는 설계자의 공학적 판단에 근거한다. 본 연구에서는 선박충돌 위험도 평가로부터 사전 계산되는 연파괴빈도 할당 가중치에 의해 각각의 교각에 허용기준을 분배하였다. 주탑과 교각 등 교량 부재요소의 설계 수평내하력을 결정하기 위해 주탑과 교각의 충격저항력 비를 변수로 수치해석을 수행하였다. 설계 수평내하력은 수로의 기하형상, 수심, 교각의 배치, 선박 통행량의 특성에 의해 동일한 교량에서도 많은 변화가 있다. 따라서 연파괴빈도의 분배 모델과 수평내하력 결정에 대한 많은 연구가 요구된다. An analysis of the annual frequency of collapse(AF) is performed for each bridge pier exposed to ship collision. From this analysis, the impact lateral resistance can be determined for each pier. The bridge pier impact resistance is selected using a probability-based analysis procedure in which the predicted annual frequency of bridge collapse, AF, from the ship collision risk assessment is compared to an acceptance criterion. The analysis procedure is an iterative process in which a trial impact resistance is selected for a bridge component and a computed AF is compared to the acceptance criterion, and revisions to the analysis variables are made as necessary to achieve compliance. The distribution of the AF acceptance criterion among the exposed piers is generally based on the designer's judgment. In this study, the acceptance criterion is allocated to each pier using allocation weights based on the previous predictions. To determine the design impact lateral resistance of bridge components such pylon and pier, the numerical analysis is performed iteratively with the analysis variable of impact resistance ratio of pylon to pier. The design impact lateral resistance can vary greatly among the components of the same bridge, depending upon the waterway geometry, available water depth, bridge geometry, and vessel traffic characteristics. More researches on the allocation model of AF and the determination of impact resistance are required.

선박통행량에 따른 교량의 선박충돌 설계강도

이성로(Lee, Seong Lo),이병화(Lee, Byung Hwa),강성수(Kang, Sung Soo) 한국콘크리트학회 2004 한국콘크리트학회 학술대회 논문집 Vol.2004 No.11

응답면기법을 이용한 격납건물의 내진안전성 평가

이성로(Lee, Seong Lo),배용귀(Bae, Yong Gwi),이병화(Lee, Byoung Hwa),이승준(Lee, Seung Joon) 한국콘크리트학회 2004 한국콘크리트학회 학술대회 논문집 Vol.2004 No.5