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Zhu Gui-long,Zhang Yi,Chen Kai-hua,Yu Jiang 기술경영경제학회 2017 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.25 No.1
The impact pattern of R&D intensity on firm performance is an interesting but not explicitlyuntangled topic in the emerging market. This study explores the topic in the context ofChina using a unique unbalanced panel data set for the China’s electronics manufacturingfirms. In order to strengthen the robustness of the statistical results, this study employs twocoherent models: pooled-OLS regression and pooled-quantile regression techniques. Thepooled-OLS regressions focusing on mean effects present the robust evidence of a positiverelationship between R&D intensity on firm performance, and the further pooled-quantileregressions portraying the relative importance of explanatory variables at different points ofthe performance distribution show that the R&D intensity exhibits a stronger impact on thebetter-performance firms. Our study presents some new evidence for the impact of R&Dintensity on firm performance in the emerging market.
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Study on Dynamic Behavior of Single-Layer Reticulated Dome by Shaking Table Test
Gui-bo Nie,Xing-long Zhu,Xudong Zhi,Fuyang Wang,Jun-Wu Dai 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
Large-span space structures in the form of reticulated domes, which have developed rapidly in the last three decades, are widely used in large-scale public buildings . In order to have a better understanding of its mechanical performance and verify the failure pattern under seismic motion, a shaking table test of a single-layer reticulated dome was carried out. The geometric position of the structural nodes and material properties of the members were measured, such as yield strength and Young’s modulus . The dynamic characterization of the model under white-noise excitation and fast size frequency was then performed to obtain its natural vibration frequency and damping factor. Next, the mechanical performance of the model under weak and strong seismic motions was investigated experimentally. Finally, a comparison between the experimental and numerical results obtained using the fi nite element software ABAQUS was made and a satisfactory agreement was found. The occurrence of large-scale deformation and signifi cant material plasticity of these structures under severe seismic motion can be regarded as indicators of dynamic strength failure. This is the fi rst time that the pattern of dynamic strength failure has been observed via shaking table tests.
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