In today's highly developed era of information technology, online education is gradually becoming an important teaching mode. Online education provides convenient learning resources and flexible learning methods t...
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In today's highly developed era of information technology, online education is gradually becoming an important teaching mode. Online education provides convenient learning resources and flexible learning methods through online platforms, allowing students to learn according to their own schedule and learning needs. However, compared to traditional education, online education faces some challenges, one of which is how to accurately assess students' learning status. Design an online education student learning status evaluation model based on dual improved neural networks with the aim of improving student learning effectiveness. Using systematic clustering statistical methods to preliminarily analyze the influencing factors of online education students' learning status, and construct an initial evaluation index system;Using the Apriori algorithm to filter the initial indicators, a final online education student learning status evaluation index system is constructed. Using wavelet denoising method to remove noise from evaluation index data, a dual improved radial basis function neural network model is constructed as input. Determine the number of hidden layers in the network using the K-means clustering algorithm, thereby determining the network structure;Based on the optimal network structure, the state transition algorithm is used to adjust the network parameters, and the trained neural network is used for online education student learning state evaluation, outputting the final evaluation result of online education student learning state. The experimental results show that the contribution rate of the model's indicator information reaches 93%, which can accurately evaluate the learning status of online education students based on the optimal model structure and parameters. The above results demonstrate that the constructed model can help teachers and students understand students' learning needs and difficulties in real-time, and provide corresponding teaching support
In dental clinics with an open floor plan,the risk of patient-to-patient transmission of respiratory disease is a *** dental procedures large amounts of bioaerosol are produced and patients cannot wear personal protec...
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In dental clinics with an open floor plan,the risk of patient-to-patient transmission of respiratory disease is a *** dental procedures large amounts of bioaerosol are produced and patients cannot wear personal protective *** paper examines how to effectively deploy air cleaner to reduce the infection risk in dental clinics with an open floor *** locations of air cleaners at various clean air delivery rates(CADRs)were *** dispersion of bioaerosol was studied through numerical simulations,and risk assessment was performed by a dose-response *** findings indicated that dental patients downstream of the background ventilation have a higher infection risk than those to the left and right of an infected patient(i.e.,the source).The lowest infection risks for the adjacent patients were found when the air cleaner was place opposite to the dentists,i.e.,on the floor at low CADR levels of 2.2 m^(3)/min or on the bench at CADR levels of 4.4 m^(3)/min or *** results of this study indicated that air cleaner can mitigate the risk of patient-to-patient transmission of SARS-CoV-2 in dental clinics with an open floor *** CADR levels determine the optimal placement of air cleaners.
This article investigates the role of the spatial dimension in the formulation of pandemic rules in Italy, with a specific focus on the municipal ordinances enacted in Milan. The study conducts a critical review of mu...
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Among historic masonry buildings, some might be constructed with different masonry materials for many reasons. Such buildings are characterized by various difficulties associated with the numerical modelling for struc...
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In the construction industry, managing cost data represents a major challenge. One of the main issues is the inaccurate cost estimation of a project. This study, based on an innovative approach, standardizes and restr...
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In current AIJ-RLB (2015), the peak pressure coefficients were prescribed by an ensemble average of ten or twenty 10-minute samples obtained from the wind tunnel tests. In this study, 12,780 10-munute samples of the p...
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Usually,the response after a disastrous event requires decision-makers in emergency operative rooms to quickly outline and understand the current post-event situation,for planning and defining strategies for a context...
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Usually,the response after a disastrous event requires decision-makers in emergency operative rooms to quickly outline and understand the current post-event situation,for planning and defining strategies for a contextualized ***,in many cases,disastrous events affect cross-border territories and/or involve multiple orga-nizations in responding to the demand generated by the *** cases require a harmonized and coordinated response by all the institutions/subjects involved in emergency *** address this challenge,this pa-per proposes the e-Atlas(emergency atlas)tool for showing and sharing information that embraces a response management perspective to explicitly support decision-makers in managing the criticalities of a post-earthquake *** e-Atlas has been designed and tested to:i)acquire sensible information for allowing decision-makers to understand in almost real-time the post-earthquake situational picture,and ii)share the representation of the situational picture among different users,allowing each of them to use it according to its specific *** of the tool are illustrated,to show how it is used in a transborder context in the North-East area of Italy.
Previous studies on the hollow cylinder torsional shear test(HCTST)have mainly focused on the macroscopic behavior,while the micromechanical responses in soil specimens with shaped particles have rarely been *** paper...
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Previous studies on the hollow cylinder torsional shear test(HCTST)have mainly focused on the macroscopic behavior,while the micromechanical responses in soil specimens with shaped particles have rarely been *** paper develops a numerical model of the HCTST using the discrete element method(DEM).The method of bonded spheres in a hexagonal arrangement is proposed to generate flexible boundaries that can achieve real-time adjustment of the internal and external cell pressures and capture the inhomogeneous deformation in the radial direction during *** angular particles are selected from Toyoura sand and reproduced in this model to approximate real sand *** model is then validated by comparing numerical and experimental results of HCTSTs on Toyoura sand with different major principal stress ***,a series of HCTSTs with different combinations of major principal stress direction(a)and intermediate principal stress ratio(b)is simulated to quantitatively characterize the sand behavior under different shear *** results show that the shaped particles are horizontally distributed before shearing,and the initial anisotropic packing structure further results in different stressestrain curves in cases with different a and b *** distribution of force chains is affected by both a and b during the shear process,together with the formation of the shear bands in different *** contact normal anisotropy and contact force anisotropy show different evolution patterns when either a or b varies,resulting in the differences in the non-coaxiality and other macroscopic *** study improves the understanding of the macroscopic response of sand from a microscopic perspective and provides valuable insights for the constitutive modeling of sand.
The dynamic identification of a full-scale, two-storey building, made of rubble stone masonry, was achieved. Different configurations were analyzed: unstrengthened masonry and retrofitted masonry, in both undamaged an...
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Measuring punch force is crucial for assessing the performance and progress of boxers during training and matches. In this paper, we present a novel wearable sensor designed specifically to measure punch force in boxe...
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