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전종수,Abdollah Shafieezadeh,Reginald DesRoches 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.5
This paper presents the results of an assessment of the seismic fragility of a long, curved multi-frame bridge under multi-support earthquake excitations. To achieve this aim, the numerical model of columns retrofitted with elliptical steel jackets was developed and validated using existing experimental results. A detailed nonlinear numerical model of the bridge that can capture the inelastic response of various components was then created. Using nonlinear time-history analyses for a set of stochastically generated spatially variable ground motions, component demands were derived and then convolved with new capacity-based limit state models to obtain seismic fragility curves. The comparison of failure probabilities obtained from uniform and multi-support excitation analyses revealed that the consideration of spatial variability significantly reduced the median value of fragility curves for most components except for the abutments. This observation indicates that the assumption of uniform motions may considerably underestimate seismic demands. Moreover, the spatial correlation of ground motions resulted in reduced dispersion of demand models that consequently decreased the dispersion of fragility curves for all components. Therefore, the spatial variability of ground motions needs to be considered for reliable assessment of the seismic performance of long multi-frame bridge structures.
Jeon, Jong-Su,Shafieezadeh, Abdollah,DesRoches, Reginald Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.5
This paper presents the results of an assessment of the seismic fragility of a long, curved multi-frame bridge under multi-support earthquake excitations. To achieve this aim, the numerical model of columns retrofitted with elliptical steel jackets was developed and validated using existing experimental results. A detailed nonlinear numerical model of the bridge that can capture the inelastic response of various components was then created. Using nonlinear time-history analyses for a set of stochastically generated spatially variable ground motions, component demands were derived and then convolved with new capacity-based limit state models to obtain seismic fragility curves. The comparison of failure probabilities obtained from uniform and multi-support excitation analyses revealed that the consideration of spatial variability significantly reduced the median value of fragility curves for most components except for the abutments. This observation indicates that the assumption of uniform motions may considerably underestimate seismic demands. Moreover, the spatial correlation of ground motions resulted in reduced dispersion of demand models that consequently decreased the dispersion of fragility curves for all components. Therefore, the spatial variability of ground motions needs to be considered for reliable assessment of the seismic performance of long multi-frame bridge structures.
Jacob P. Walsh,Natasha DesRochers,Justin B. Renaud,Keith A. Seifert,Ken K.-C. Yeung,Mark W. Sumarah 고려인삼학회 2021 Journal of Ginseng Research Vol.45 No.1
Background: It is estimated that 20-30% of ginseng crops in Canada are lost to root rot each harvest. This disease is commonly caused by fungal infection with Ilyonectria, previously known as Cylindrocarpon. Previous reports have linked the virulence of fungal disease to the production of siderophores, a class of small-molecule iron chelators. However, these siderophores have not been identified in Ilyonectria. Methods: High-resolution LC-MS/MS was used to screen Ilyonectria and Cylindrocarpon strain extracts for secondary metabolite production. These strains were also tested for their ability to cause root rot in American ginseng and categorized as virulent or avirulent. The differences in detected metabolites between the virulent and avirulent strains were compared with a focus on siderophores. Results: For the first time, a siderophore N,N",N""-triacetylfusarinine C (TAFC) has been identified in Ilyonectria, and it appears to be linked to disease virulence. Siderophore production was suppressed as the concentration of iron increased, which is in agreement with previous reports. Conclusion: The identification of the siderophore produced by Ilyonectria gives us further insight into the root rot disease that heavily affects ginseng crop yields. This research identifies a molecular pathway previously unknown for ginseng root rot and could lead to new disease treatment options.
Jeremy Bauchet,Sylvain Giroux,Helene Pigot,Dany Lussier-Desrochers,Yves Lachapelle 동국대학교 정보융합기술원 2008 International Journal of Assistive Robotics and Sy Vol.9 No.4
Cognitively impaired people in general and people with intellectual disabilities in particular may suffer from deficits of attention, initiation, memory, or planning. Such deficits prevent them to perform accurately and successfully their activities of daily living (ADL). Meal preparation is a significant ADL for achieving autonomous living. Thanks to Archipel, a pervasive cognitive assistant for meal preparation, they can improve and foster their autonomy and auto-determination. A study involving twelve (12) persons with intellectual disabilities demonstrated that Archipel, pervasive computing, and ambient intelligence are very promising technologies.