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Design of students’ learning state evaluation model in online education based on double improved neural network

Journal of Ambient Intelligence and Humanized Computing 2024年第4期15卷 2467-2480页

作者： Zhang, Huaying Department of Construction Information Engineering Henan Polytechnic of Architecture Henan Zhengzhou450064 China

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

关键词： Students

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Effectiveness of air cleaner on mitigating the transmission of respiratory disease in a dental clinic environment

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Building Simulation 2024年第10期17卷 1789-1803页

作者： Gang Yang Yifan Wang Ka Chung Chan Kwok Wai Mui Thomas F.Flemmig SThomas Ng Christopher Y.H.Chao Sau Chung Fu Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Faculty of Dentistry The University of Hong KongHong KongChina Department of Architecture&Civil Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

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.

关键词： infection risk air cleaner location dental clinic CFD simulation respiratory disease

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The space of rules and rules of space: reflecting on local ordinances during the Covid-19 pandemic

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City, Territory and architecture 2024年第1期11卷 16页

作者： De Franco, Anita Pacchi, Carolina Department of Architecture and Urban Studies Polytechnic University of Milan Milan Italy Department of Civil Engineering and Architecture University of Pavia Pavia Italy

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 multidisciplinary literature, which often marginalises the significance of spatial dynamics in the development of (pandemic) regulatory frameworks, relegating “space” to a peripheral rather than central concern. This research proposes an analytical framework to evaluate spatial rules based on key thematic categories, with reference to the application and structural attributes of pandemic regulations. The article also discusses the practical integration of spatial dimensions into regulatory design, emphasising the imperative of acknowledging and engaging with unique spatial characteristics in order to enhance the efficacy of legal and policy interventions. © The Author(s) 2024.

关键词： Health emergency Local scale Municipal ordinances Pandemic rules Rules Social behaviours Social norms Space Spatial rules Urban places

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Comparative Pushover and Limit Analysis During Seismic Events: A Case Study of a Masonry Structure in Southern Italy 18th

Comparative Pushover and Limit Analysis During Seismic Event...

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18th International Brick and Block Masonry Conference, IB2MaC 2024

作者： Palmieri, Davide Ottaviano Wang, Peixuan Rizzo, Fabio Milani, Gabriele Foti, Dora Department of Architecture Construction and Design Polytechnic University of Bari Bari Italy Department of Architecture Built Environment & Construction Engineering ABC Polytechnic University of Milan Milan Italy

ISBN: (纸本)9783031733130

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 structural behaviour evaluation purposes. This is evident since current standards do not provide sufficient explanation on the numerical modelling techniques, whilst they suggest using different methods without ensuring the required refinement of the model itself. The differences between the two masonry materials in terms of physical and mechanical properties of the "mixed" masonry buildings might provoke certain collapse mechanisms which are affected by the modelling techniques. In this paper, a typical case study was examined, a former cinema from the 1950s, built by a stone masonry for the lower part and a brick masonry for the upper one, with a concrete frame in between. In particular, a comparison is made between a traditional pushover, performed on a brick-element FE model with Mohr-Coulomb rupture criterion, while in the second case, a limit analysis was implemented on the same model, where the structure is discretized by means of infinitely rigid resistant triangle elements with plastic admissibility allowed only at the interface between the various elements, for a limit analysis of local kinematics. The present work aims to highlight the differences in the structural response resulting from the variant modelling methods by means of uncertainty sensitivity analysis, since the standards focus more on the analysis method rather than the modelling technique. Thus, the final objective of the work is uncertainty about the response estimate. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Brick

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Innovative standardized cost data structure: application on price list document for estimating public tendering 41

Innovative standardized cost data structure: application on ...

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41st International Symposium on Automation and Robotics in Construction, ISARC 2024

作者： Cassandro, Jacopo Gatto, Chiara Farina, Antonio Mirarchi, Claudio Pavan, Alberto Department of Architecture Built Environment and Construction Engineering Polytechnic of Milan Italy

ISBN: (纸本)9780645832211

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 restructures unit cost items defining a new cost ontology starting from fundamental resources (materials, labor, and equipment) and then moving to construction work. A new methodology has been proposed to reduce errors, verify the uniqueness of the cost items, and ensure the correctness of cost estimates. This approach will allow, both humans and machines, to read and use information more easily and accurately. In conclusion, this new structure will provide a standardized and structured cost domain. © 2024 ISARC. All Rights Reserved.

关键词： Construction industry

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EVALUATION OF PEAK PRESSURE COEFFICIENTS ON LOW-RISE BUILDING BASED ON PROBABILISTIC THEORY

Journal of Structural and Construction Engineering

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Journal of Structural and Construction engineering 2023年第805期88卷 395-402页

作者： Kim, Yong Chul Kinoshita, Taito Dept. of Engineering Faculty of Engineering Tokyo Polytechnic University Japan Architecture Department Osaka branch Daiho Corporation Japan

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 peak pressure coefficients were measured, and the cumulative distributions were identified using the extreme value distributions and the effect of number of 10-minute samples were examined. Lastly, design values were proposed based the zones of low-rise building. Using the proposed values, the peak pressure coefficients corresponding to the specific non-exceedance probabilities of the wind loads can be calculated from the ensemble averaged peak pressure coefficients. © 2023 Architectural Institute of Japan. All rights reserved.

关键词： Wind tunnels

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Sharing the post-earthquake situation for emergency response management in transborder areas: The e-Atlas tool

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Journal of Safety Science and Resilience 2022年第1期3卷 72-86页

作者： Stefano Grimaz Petra Malisan Andrea Pividori SPRINT-Lab Polytechnic Department of Engineering and ArchitectureUniversity of Udine33100UdineItaly

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.

关键词： Emergency response management GIS Seismic emergency Decision-making support e-Atlas

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Micromechanical modeling of hollow cylinder torsional shear test on sand using discrete element method

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Journal of Rock Mechanics and Geotechnical engineering 2024年第12期16卷 5193-5208页

作者： Shunxiang Song Pei Wang Zhenyu Yin Yi Pik Cheng Institute of Geotechnical Engineering School of Civil Engineering and ArchitectureEast China Jiaotong UniversityNanchangChina Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondonUK

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.

关键词： Sand Hollow cylinder torsional shear test(HCTST) Discrete element method(DEM) Principal stress rotation Micromechanics Anisotropy

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Dynamic identification of a stone masonry building: influence of damage and of CRM retrofitting 64

Dynamic identification of a stone masonry building: influenc...

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64th International Conference on Vibroengineering

作者： Boem, Ingrid Dilena, Michele Gattesco, Natalino Department of Engineering and Architecture University of Trieste Trieste Italy Polytechnic Department of Engineering and Architecture University of Udine Udine Italy

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 and damaged conditions. Damage was accomplished by testing the building under lateral cyclic loading, to reproduce the seismic effects. The strengthening technique (CRM – Composite Reinforced Mortar) consisted in plastering the outer facades by means of a 30 mm tick mortar coating reinforced with glass-fiber polymer meshes and in introducing transversal connectors injected in the masonry. The mode shapes and natural vibrating frequencies were analyzed and compared, evidencing the effects of damage and of retrofitting. A finite element numerical model was developed, to perform eigenvalue analysis and calibrate the equivalent masonry stiffness for the different configurations. © 2023 JVE International. All rights reserved.

关键词： Retrofitting

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Wearable Sensor for Boxer Performance Improvement

Wearable Sensor for Boxer Performance Improvement

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2023 IEEE International Workshop on Sport, Technology and Research, STAR 2023

作者： Affanni, Antonio Rinaldo, Roberto Zontone, Pamela University of Udine Polytechnic Department of Engineering and Architecture Udine Italy

ISBN: (纸本)9798350316056

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 boxers. The sensor is a unique example of a measuring wearable device that can be easily integrated into commercial boxing gloves, making it suitable for both training and matches. The module is lightweight, compact, and fits into commercial gloves without compromising comfort or mobility. Moreover, the sensor incorporates wireless communication capabilities, enabling real-time monitoring of punch force data on a companion mobile application or a dedicated display unit, facilitating immediate feedback and analysis. We conducted tests with four amateur boxers, and we chose the boxers trying to cover a wide range of standard categories. The results demonstrate that the sensor reliably measures punch force across different boxing techniques such as straights and hooks, with accuracy in the order of 6 % of full scale. The presented wearable sensor represents a significant advancement in wearable sensor technology for boxing;its integration into commercial gloves allows for seamless adoption by boxers of all skill levels, enhancing training efficiency and promoting better performance during matches. © 2023 IEEE.

关键词： Wearable sensors

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