Journal of Shanghai Jiaotong University (Science)
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Multi-Model Ensemble Deep Learning Method to Diagnose COVID-19 Using Chest Computed Tomography Images
Journal of Shanghai Jiaotong University (Science) - Tập 27 - Trang 70-80 - 2021
Deep learning based analyses of computed tomography (CT) images contribute to automated diagnosis of COVID-19, and ensemble learning may commonly provide a better solution. Here, we proposed an ensemble learning method that integrates several component neural networks to jointly diagnose COVID-19. Two ensemble strategies are considered: the output scores of all component models that are combined w......
Polycrystalline behavior analysis of extruded magnesium alloy AZ31
Journal of Shanghai Jiaotong University (Science) - Tập 18 - Trang 186-189 - 2013
Uniaxial tensile and compressive tests were performed at room temperature on extruded AZ31 Mg alloy specimens and distinct tensile-compressive anisotropy was detected. Deformed specimens were examined and the results indicate that the generation of {10
$\bar 1$
2}〈10
......
Nonlinear analyses of exchange rates of six emerging markets
Journal of Shanghai Jiaotong University (Science) - Tập 17 - Trang 108-113 - 2012
This paper presents some empirical evidences on the presence of nonlinearity of exchange rates of six emerging markets by using Brock-Dechert-Scheinkman (BDS) test and Volterra-Wiener-Korenberg (VWK) model, respectively. The nonlinear dependences are found in the exchange rates of six emerging markets. Furthermore, this paper applies the VWK model with surrogate data method to detect if their nonl......
Substructuring technique for dynamics analysis of flexible beams with large deformation
Journal of Shanghai Jiaotong University (Science) - Tập 22 - Trang 562-569 - 2017
In this paper, the substructuring technique is extended for the dynamics simulation of flexible beams with large deformation. The dynamics equation of a spatial straight beam undergoing large displacement and small deformation is deduced by using the Jourdain variation principle and the model synthesis method. The longitudinal shortening effect due to the transversal deformation is taken into cons......
Residual life prediction based on nonlinear fatigue damage accumulation model
Journal of Shanghai Jiaotong University (Science) - Tập 20 - Trang 449-453 - 2015
When a nonlinear fatigue damage accumulation model based on damage curve approach is used to get better residual life prediction results, it is necessary to solve the problem caused by the uncertain exponent of the model. Considering the effects of load interaction, the assumption that there is a linear dependence between the exponent ratio and the loading ratio is established to predict fatigue r......
Dynamic investigation on composite flexible multi-body system considering thermal effect
Journal of Shanghai Jiaotong University (Science) - Tập 15 - Trang 414-422 - 2010
The dynamic performance of composite flexible multi-body system under the simultaneous action of thermal fields and driving constraint is analyzed. Based on strain-displacement relation of the Mindlin plate theory which includes transverse shear deformation, and considering thermal effect, variation equations of laminated plate are derived by the principle of virtual work. The finite element metho......
First-principles prediction of ductility in β-type Ti-Mo binary alloys
Journal of Shanghai Jiaotong University (Science) - Tập 16 - Trang 227-230 - 2011
Recent studies suggest that the ratio of the shear modulus (G) to the bulk modulus (B) and the Poisson’s ratio (ν) are good indicators of ductility. Using the method of supercell and the first-principles pseudopotential plane-wave method, the G/B and ν of the β-type Ti-Mo binary alloys with Mo molar fraction (x
Mo) ranging from 6.25% to 37.5% are calculated. The results sho......
Hydrogen adsorption by woodceramics produced from biomass
Journal of Shanghai Jiaotong University (Science) - Tập 17 - Trang 330-333 - 2012
Hydrogen adsorption characteristics of woodceramics, made from radiata pine wood fiber boards carbonized at 1 473K after impregnation with phenolic resin, with and without chemical treatment in an alkaline (KOH) or an acid (H2SO4) solution were investigated The hydrogen adsorption capacity is improved by chemical treatment. The chemical treatment by KOH improves the adsorption capacity more than b......
Hydraulic properties analysis of the unsaturated cracked soil
Journal of Shanghai Jiaotong University (Science) - Tập 22 - Trang 35-44 - 2017
Morphological parameters of cracks significantly affect the hydraulic conductivity of cracked soil. A laboratory test was conducted to study the hydraulic properties of cracks. The dynamic development of cracks in soil during drying and wetting was measured in the test. Based on the test results, the relationships between the morphological parameters and the soil water content were quantified. Acc......
Improved Spatial Registration Algorithm for Sensors on Multiple Mobile Platforms
Journal of Shanghai Jiaotong University (Science) - Tập 27 - Trang 638-648 - 2022
This paper focuses on the spatial registration algorithm under the earth-center earth-fixed (ECEF) coordinate system for multiple mobile platforms. The sensor measurement biases are discussed with the attitude information of the platform into consideration. First, the biased measurement model is constructed. Besides, the maximum likelihood registration (MLR) algorithm is discussed to simultaneousl......
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