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

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

ISBN: (纸本)9798350316056

Human Activity Recognition (HAR) is a research area that is receiving increasing attention in recent years. In this paper we propose the application of different supervised learning algorithms to recognize distinct human activities. In particular, we use a dataset that includes inertial measurements recorded from sensors placed in various positions on the subjects' body, while performing sports and daily activities. Considering possible real-life applications of the system, we analyze only the acceleration signal coming from a single and low-complexity sensor placed on the torso of the subjects. We derive different statistical features from the three axial accelerations. These features are the input of Machine Learning algorithms with the purpose of recognizing the particular activity carried out by the subjects. The unprocessed acceleration signals are instead sent to Deep Learning algorithms, giving us the opportunity to compare the performance of the classifiers. In the end, we achieve accuracy values of 73.3% and 86.6% in classifying 19 types of different human activities, using a Random Forest (RF) classifier and a 1D Convolutional Neural Network (CNN) network, respectively. © 2023 IEEE.

关键词： Learning algorithms

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EXPERIMENTAL INVESTIGATION ON LONG-TERM BEHAVIOR OF TIMBER-TO-TIMBER SHEAR CONNECTIONS MADE BY INCLINED SELF-TAPPING SCREWS 13

EXPERIMENTAL INVESTIGATION ON LONG-TERM BEHAVIOR OF TIMBER-T...

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13th World Conference on Timber engineering: Timber for a Livable Future, WCTE 2023

作者： Gubana, Alessandra Melotto, Massimo De Cillia, Luca Mazelli, Alessandro DPIA Polytechnic Department of Engineering and Architecture University of Udine Italy

ISBN: (纸本)9781713873297

Self-tapping screws are an interesting solution for timber-to-timber shear connections due to their performance, their economic advantages and their ease of use. The screws are preferably used inclined with respect to the shear flow direction, to improve the stiffness and the strength of the connection. The shear transfer mechanism is influenced also by the withdrawal capacity of the screw and by friction between timber elements. These connections are useful for the bending reinforcement of existing timber floors, but the design of these composite-sections requires the knowledge of the connection behaviour. However, very few data are available on the long-term behaviour. An experimental campaign to follow the connection behaviour during time has been performed. The results of a first group of twenty-four identic specimens were already presented. The last results of another group of sixty-three specimens are here reported. One half of the specimens was stored in a controlled environment, one half was stored in a not-controlled environment. Air temperature and humidity were regularly recorded. Push-out tests (as soon as built and after 6, 12 and 24 months) were performed and the main mechanical parameters of the connections as strength, stiffness and ductility at different ages are here compared. © 2023 13th World Conference on Timber engineering, WCTE 2023. All rights reserved.

关键词： Timber

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EVALUATION OF THE BEHAVIOUR FACTOR BY INCREMENTAL DYNAMIC ANALYSES FOR THE SEISMIC DESIGN OF LIGHT-FRAME TIMBER BUILDINGS 13

EVALUATION OF THE BEHAVIOUR FACTOR BY INCREMENTAL DYNAMIC AN...

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13th World Conference on Timber engineering: Timber for a Livable Future, WCTE 2023

作者： Gubana, Alessandra Mazelli, Alessandro DPIA Polytechnic Department of Engineering and Architecture University of Udine Italy

ISBN: (纸本)9781713873297

Light Frame Wood structures are today a valid alternative to Cross Laminated Timber structures for low and medium height buildings, both in terms of performance and environmental impact, given the lower volume of wood used. Light wood frames demonstrate a ductile behavior under seismic actions, linked to the plastic deformation of the connections, but uncertainties still regard the value of the behaviour factor associated to these types of structures. This paper presents the evaluation of the behaviour factor ‘q’, used for the seismic design, based on Incremental Dynamic Analyses for Light-Frame Timber Buildings. Papers in literature regarding its evaluation are mostly based on static nonlinear pushover analyses. Example buildings with 2, 3 and 4 storeys, were designed according to capacity design and then analysed by varying the displacement-ductility of the sheathing-to-frame connection. The results are then compared with the requirements provided by codes. © WCTE *** rights reserved

关键词： Seismic design

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Convolutional Neural Networks Using Scalograms for Stress Recognition in Drivers 31

Convolutional Neural Networks Using Scalograms for Stress Re...

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31st European Signal Processing Conference, EUSIPCO 2023

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

ISBN: (纸本)9789464593600

In this paper we present a system which allows the detection of stress in drivers by analyzing a two-dimensional representation of their electrodermal activity Skin Potential Response (SPR) signal, and their electrocardiogram signal. Signals were logged during a simulated drive, in an experiment carried out in a company using a professional car driving simulator. Subjects had to overcome some stress-inducing events located at specific positions during the drive. The acquired SPR and heart rate signals are analyzed with scalogram plots, in order to obtain a time-frequency representation of the signals. The 2D scalogram representation is segmented into images, associated to short time segments, which are classified using a Convolutional Neural Network architecture. We show that the use of scalograms can allow the system to perform well in distinguishing among stress and non-stress situations, achieving a 91.78% accuracy. The same system was tested on real driving data available from a public dataset, achieving a 99.24% accuracy. © 2023 European Signal Processing Conference, EUSIPCO. All rights reserved.

关键词： Digital storage

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Analysis of the influence of water qualities on the strength of concrete

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Journal of engineering and Applied Science 2024年第1期71卷 110页

作者： Mbuh, Kuma Moses Nsahlai, Nyuykongi Leonard Penka, Bertrand Jule Fru, Chi Pride Department of Civil Engineering and Forestry Techniques Higher Technical Teacher Training College University of Bamenda Bambili Cameroon Department of Civil Engineering and Architecture National Higher Polytechnic Institute University of Bamenda Bambili Cameroon

Concrete is commonly employed in construction for its tremendous compressive strength, despite its low tensile strength. This study aimed at analyzing the strength of concrete when mixed with water of varying qualities. Before concrete is formulated, tests are done on the aggregates to ascertain the right proportions but not on water used. Dreux-Gorrise concrete formulation method was employed. CAMWATER (tap water), rain water and water from a free-flowing river was used to cast concrete samples after which it was crushed to obtain 7 and 28 day resistances. The water qualities varied were pH and hardness. Hydrochloric acid and sodium hydroxide were used to vary the pH of water. Results showed an increase in concrete strength as a function of increase in water pH. Water with a high pH resulted in concrete with an appreciable strength value while acidic water resulted in very low strength values. The usage of hard water for mixing concrete resulted in a strength value lower than with soft water. Conclusively, water quality has an effect on the strength of concrete. Therefore, it is advisable to use water with a high pH value for mixing concrete, preferring rainwater over tap water when mixing concrete due to hardness of water. © The Author(s) 2024.

关键词： Water quality

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Non-linear dynamic analysis of an infilled RC building for increasing seismic hazard levels 20th

Non-linear dynamic analysis of an infilled RC building for i...

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20th fib Symposium on ReConStruct: Resilient Concrete Structures, 2024

作者： Sorace, Stefano Lisetto, Samantha Terenzi, Gloria Polytechnic Department of Engineering and Architecture University of Udine Udine Italy Department of Civil and Environmental Engineering University of Florence Florence Italy

ISBN: (纸本)9782940643257

A seismic assessment study on an Italian school with reinforced concrete (RC) structure built in the early 1960s is presented herein. The seismic performance of the building is evaluated, via time-history dynamic analysis, by jointly examining the response of the structural members and the masonry infills and partitions. In order to attain a comprehensive evaluation, the analysis is extended to four supplementary seismic hazard levels, identified by 50%, 40%, 30% and 20% probabilities of being exceeded over the reference structural lifespan, VR, in addition to the four ones assumed by default by the Italian Technical Standards, with 81%, 63%, 10% and 5%/VR probabilities. The results highlight unsafe stress states in a non-negligible percentile portion of columns and beams, and damaged response conditions of masonry panels beginning from the input action with 30%/VR probability. The number of structural members in unsafe conditions and significantly damaged panels increases to about 50% and 45%, respectively, for the action scaled at 20%/VR probability. This prompts to extend the assessment analysis of RC infilled structures also to an intermediate hazard level, situated in the 30-20%/VR exceedance probability range. © fédération internationale du béton (fib).

关键词： Reinforced concrete

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A state-of-the-art review of the development of self-healing concrete for resilient infrastructure

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Frontiers of Structural and Civil engineering 2024年第2期18卷 151-169页

作者： Dong LU Xi JIANG Yao ZHANG Shaowei ZHANG Guoyang LU Zhen LENG Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Laboratory of Fire Safety School of Safety Engineering and Emergency ManagementShijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Architecture and Civil Engineering City University of Hong KongHong Kong 999077China

The brittleness of cement composites makes cracks almost inevitable,producing a serious limitation on the lifespan,resilience,and safety of concrete *** address this brittleness,self-healing concrete has been developed for regaining its mechanical and durability properties after becoming cracked,thereby promising sustainable development of concrete *** paper provides a comprehensive review of the latest developments in self-healing *** begins by summarizing the methods used to evaluate the self-healing efficiency of ***,it compares strategies for achieving healing *** then discusses the typical approaches for developing self-healing ***,critical insights are proposed to guide future studies on the development of novel self-healing *** review will be useful for researchers and practitioners interested in the field of self-healing concrete and its potential to improve the durability,resilience,and safety of concrete infrastructure.

关键词： resilient infrastructure sustainable concrete self-healing cracks

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Energy flexibility and resilience analysis of demand-side energy efficiency measures within existing residential houses during cold wave event

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Building Simulation 2024年第7期17卷 1043-1063页

作者： Xiaoyi Zhang Fu Xiao Yanxue Li Yi Ran Weijun Gao Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdaoChina Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Faculty of Environmental Engineering The Universityof KitakyushuKitakyushuJapan

Using the behind-meter data,this study applied a comparison and optimization-based framework to evaluate the energy flexibility and resilience of distributed energy resources within existing houses during cold wave *** analysis demonstrates the effectiveness of high envelope insulation level in improving energy resilience,identifies impacts of distributed energy resources on variations of household electricity ***,a 14.6%reduction in the median value of the normalized load of building group with low U-values,implementations of cogeneration system effectively suppressed variations of electricity *** energy performances of on-site generators are evaluated based on high resolution data,energy flexibility of domestic hot water and thermostatically controlled loads were investigated through built demand response *** reveal that electrifying hot water demand offers additional power flexibility,the integration of fuel cell cogeneration system has proven to be an efficient energy resource,enabling on-site generation of both electricity and hot water,substantially reducing grid *** extreme cold event resulted in significant spikes in space heating power *** optimization results demonstrate that reducing the indoor setpoint temperature effectively decreases daily power consumption by approximately 5.0%per degree *** findings help acquire better understanding of interconnections between energy efficiency and resilience of residential energy-efficient measures.

关键词： system modeling energy efficiency energy resilience cold wave thermal comfort

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Generic load regulation strategy for enhancing energy efficiency of chiller plants

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Building Simulation 2024年第8期17卷 1273-1287页

作者： Hang Wan Yuyang Gong Shengwei Wang Yongjun Sun Tao Xu Gongsheng Huang Department of Architecture and Civil Engineering City University of Hong KongHong KongChina Department of Building Environment and Energy Engineering Hong Kong Polytechnic UniversityHong KongChina School of Civil Engineering Guangzhou UniversityGuangzhouChina Shenzhen Research Institute of City University of Hong Kong ShenzhenChina

In many chiller plants,high coefficient of performance(COP)is only achieved at a few favorable part load ratios(PLRs),while the COP is low at many other non-favorable *** address this issue,this study proposes a generic load regulation strategy that aims to maintain chiller plants operating at high COP,particularly under non-favorable *** is achieved by incorporating thermal energy storage(TES)units and timely optimizing the charging and discharging power of the integrated TES *** optimal charging and discharging power is determined by solving a dynamic optimization problem,taking into account the performance constraints of the TES units and the chiller *** provide an overview of the energy-saving potential of the proposed strategy,a comprehensive analysis was conducted,considering factors such as building load profiles,COP/PLR curves of chillers,and attributes of the TES *** analysis revealed that the proposed load regulation strategy has the potential to achieve energy savings ranging from 5.7%to 10.8%for chiller plants with poor COPs under unfavorable PLRs,particularly in buildings with significant load variations.

关键词： load regulation thermal energy storage chiller plants building energy efficiency

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Influence of structural irregularity on the q-behaviour factor of light-frame timber buildings by means of incremental dynamic analysis 64

Influence of structural irregularity on the q-behaviour fact...

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64th International Conference on Vibroengineering

作者： Mazelli, Alessandro Bedon, Chiara Morassi, Antonino DPIA Polytechnic Department of Engineering and Architecture University of Udine Udine Italy DIA Department of Engineering and Architecture University of Trieste Trieste Italy

This paper investigates the role of sheathing-to-framing connection ductility in the evaluation of the structural q-behaviour factor for Light-Frame Timber (LFT) buildings, by means of Incremental Dynamic Analyses (IDA). This approach allows to consider nonlinear cyclic behaviour of the walls, which cannot be taken into account with the static approaches used in most of the available literature on LFT buildings. To this aim, Finite Element wall models, preliminary calibrated towards a cyclic full-scale experimental test, are built to study six case-study buildings, both regular and non-regular, with 2, 3 or 4 storeys, which were designed according to Eurocode and Capacity Design provisions. Parametric analyses are performed by varying the displacement-ductility of the panel. Finally, numerical results are discussed in terms of q-behaviour factor, and its sensitivity to structural irregularities, with respect to existing code provisions for timber buildings. © 2023 JVE International. All rights reserved.

关键词： Factor analysis

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