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15th International conference on Civil, Structural and Environmental engineering Computing, CIVIL-COMP 2015

作者： Campista, F. Gaspar, C.M.R. Da Silva, J. G. Santos Neves, L. F. Costa Civil Engineering Post-Graduate Programme State University of Rio de Janeiro Brazil Ctructural Engineering Department State University of Rio de Janeiro Brazil Civil Engineering Department University of Coimbra Portugal

The current design of steel-concrete composite floors might be susceptible to resonance phenomenon, causing undesirable vibrations in the frequency range that is the most noticeable to humans, i.e. 4Hz to 8Hz. In addition, it has been observed in design practice low floor structural damping ratios, which is related to the type of construction, materials, presence of non-structural elements, age and quality of the construction. Therefore, all these combinations make composite floors very susceptible to annoying vibrations induced by humans. Hence the main objective of the work, described in this paper, is to investigate the dynamic behaviour of a composite multi-storey building subjected to human rhythmic activities (aerobics). The structural model represents a typical interior floor bay of a commercial building used as a gym and is composed of three floor levels spanning 20m by 20m, with a total area of 3 × 400m2. An extensive parametric study was developed with the aim of obtaining the peak accelerations, RMS and VDV values once the investigated building develops a multi-modal behaviour. Thus, based on two different mathematical formulations used for modelling human rhythmic actions (aerobics), the worst dynamic design cases i.e. a resonance phenomenon, were induced for each natural frequency of the building that lies in the human force frequency range. The human comfort of the building was investigated and the vibration transmissibility related to the steel columns was verified. Based on the results, the composite multistorey building demonstrated high vibration levels that compromise the human comfort. ©Civil-Comp Press, 2015.

关键词： Vibration analysis

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Convective heat transfer in green facade system

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BIOSYSTEMS engineering 2019年 188卷 67-81页

作者： Convertino, Fabiana Vox, Giuliano Schettini, Evelia Univ Bari Dept Agr & Environm Sci DISAAT Via Amendola 165-A I-70126 Bari Italy

Green facades are passive living technologies applied to buildings. They produce many advantages for human wellbeing, building performance, and city environments. Knowledge of the energy behaviour of green facade systems is needed to inform their best design and application, and to define their energy performances. Heat and mass exchanges between the system and the surrounding environment must be determined. In this paper, the schematisation of the green facade system into layers and the energy balance approach are proposed. This study focuses on the analysis of the convective heat transfer occurring between the plant layer and the external air. It is difficult to realistically describe this mechanism and many approaches in the literature were considered. Six different formulae were evaluated. mathematical modelling and empirical data were both used. Once it was discovered that forced convection was the prevailing convective type, selected formulae were applied to the data, which were collected from an experimental green facade at the University of Bari. Based on the energy balance of the plant layer, a comparison between the calculated and measured values was carried out. Qualitative and quantitative statistical methods were used to assess the goodness -of-fit of the considered convective models. These analyses suggest the least and the most suitable approaches for convective heat transfer evaluation. The empirical equation of Morrison and Barfield and an adaptation to green facades of Deardorff model showed the best agreement. This study could be extended in order to write codes for building energy simulation software. (C) 2019 IAgrE. Published by Elsevier Ltd. All rights reserved.

关键词： Green infrastructure Energy balance modelling Convective coefficient Green layer Passive system

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Using cognitive modelling simulations for user interface design decisions

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17th International conference on Industrial and engineering Applications of Artificial Intelligence and Expert Systems, IEA/AIE 2004

作者： Emond, Bruno West, Robert L. Institute for Information Technology National Research Council Canada 1200 Montreal Road Building M-50 OttawaONK1A 0R6 Canada Department of Psychology and Department of Cognitive Science Carleton University 1125 Colonel By Drive OttawaONK1S 5B6 Canada

ISBN: (纸本)3540220070

This paper argues for the relevance of cognitive modelling and cognitive architectures to support user interface design decisions. From a humancomputer interaction point of view, cognitive modelling can have benefits both for theory and model building, and for the design and evaluation of systems usability. Cognitive modelling research applied to human-computer interaction has two complimentary objectives: 1) to develop theories and computational models of human interactive behaviour with information technologies, and 2) to use the computational models as building blocks for the design, implementation, and evaluation of interactive technologies. As an example of application of cognitive modelling to technology design, the paper presents a simulation of interactive behaviour with five different adaptive menu algorithms: random, fixed, stacked, frequency based, and activation based. Results of the simulation indicate that fixed menu positions have an advantage over adaptive menus in taking advantage of the capability of human memory in human-computer systems. © Springer-Verlag Berlin Heidelberg 2004.

关键词： human computer interaction

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A Multi-agent System for the modelling of the HIV Infection

A Multi-agent System for the Modelling of the HIV Infection

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5th KES International conference on Agent and Multi-Agent Systems - Technologies and Applications (KES-AMSTA)

作者： Laroum, Toufik Tighiouart, Bornia Univ August 20 Skikda 1955 Algeria Univ Badji Mokhtar Annaba Algeria

ISBN: (纸本)9783642219993;9783642220005

The mathematical tool was used for a long time to model the dynamics of the populations, at present approach of modeling Multi-agents seem to be promising in the views of its capacity to master the complexity of the studied systems. In this work we try to model the population of cells occurring during the infection by the virus of the human immunodeficiency (HIV) to show the efficiency of the approach Multi-agents by comparing with the mathematical approach. The obtained results allowed to bring to light the behaviour and the interactions between the various cells studied in agreement with the biological reports.

关键词： Simulation Multi-Agents dynamics of the populations the infection HIV the virtual community bio-informatics

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An object-oriented analysis of complex numerical models

An object-oriented analysis of complex numerical models

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17th conference of the European-Scientific-Association-on-Material-Forming (ESAFORM)

作者： Maciol Piotr Bureau Romain Sommitsch Christof AGH Univ Sci & Technol Dept Appl Comp Sci & Modelling Al Mickiewicza 30 PL-30059 Krakow Poland Graz Univ Technol Inst Mat Sci & Welding Kopernikusgasse 24 A-8010 Graz Austria

ISBN: (纸本)9783038351061

modelling the behaviour of metal alloys during their thermo-mechanical processing relies on the physical and mathematical description of numerous phenomena occurring in several space scales and evolving on different characteristic times. Although it is possible to develop complicated multi-scale models, it is often simpler to simulate each phenomenon separately in a single-scale model and link all the models together in a global structure responsible for their good interaction. Such a structure is relatively difficult to design. Both efficiency and flexibility must be well balanced, keeping in mind the character of scientific computing. In that context, the Agile Multiscale modelling Methodology (AM3) has been developed in order to support the object-oriented designing of complex numerical models [1]. In this paper, the application of the AM3 for designing a model of the metal alloy behaviour is presented. The basis and some consequences of the application of the Object-Oriented design of a sub-models structure are investigated. The object-oriented (OO) design of a 3 internal variables model of the dislocations evolution is presented and compared to the procedural one. The main advantages and disadvantages of the OO design of numerical models are pointed out.

关键词： Object-Oriented numerical models internal variable Thermo-mechanical treatment

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Conceptual-level bio-inspired retinal design using analogue VLSI systems

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INTERNATIONAL JOURNAL OF BIOMEDICAL engineering AND TECHNOLOGY 2016年第1期20卷 51-65页

作者： Alavanthar, T. Rao, K. Srinivasa SASTRA Univ Sch Elect & Elect Engn Thanjavur 613401 Tamil Nadu India SASTRA Univ Srinivasa Ramanujan Ctr Kumbakonam 612001 Tamil Nadu India

One way to understand a neurobiological system is by building a simulacrum that replicates its behaviour in real time using similar constraints. Bionic eye helps visually impaired people. A neuromorphic system concepts and circuit design method involved is discussed in this paper. The mathematical model has been simulated and validated in MATLAB using artificial stimulus. A photoreceptors circuit realised and simulated using analogue mixed-signal VLSI behavioural modelling. The estimated parameters using the mathematical model are incorporated in behavioural model to describe neuromorphic retinal system topology and performance. The behavioural models hold up the signal flow correlation between input and outputs. A one-dimensional hardware photoreceptors circuit was constructed and the performance is studied under the steady state condition, tested with impulses or step input that simulates the physical dynamics of the biological system using VHDL-AMS which illustrate the specific features of system level design. Finale future scopes are also presented evidently.

关键词： neuromorphic photoreceptors simulacrum bionic eye retina human cone ERG photodiode behavioural model analogue mixed-signal VHDL-AMS

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modelling Visual Decision Making Using a Variational Autoencoder 19

Modelling Visual Decision Making Using a Variational Autoenc...

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19th International conference on Cognitive modelling, ICCM 2021 - Co-located with the 54th Annual Meeting of the Society for mathematical Psychology

作者： Malloy, Tyler Sims, Chris R. Department of Cognitive Science 110 8th Street TroyNY12180 United States

ISBN: (纸本)9780998508252

Due to information processing constraints and cognitive limitations, humans necessarily form limited representations of complex visual stimuli when making utility-based decisions. However, it remains unclear what mechanisms humans use to generate representations of visual stimuli that allow them to make predictions of utility. In this paper, we develop a model that seeks to account for the formation of representations in utility-based economic decision making. This model takes the form of a β-variational autoencoder (β-VAE) trained with a novel utility-based learning objective. The proposed model forms representations of visual stimuli that can be used to make utility predictions, and are also constrained in their informational complexity. This representation modelling approach shares common features with related methods, but is unique in its connection to utility in economic decision making. We show through simulation that this approach can account for several phenomena in human economic decision making and learning tasks, including risk-averse behaviour and distortion in the calculation of expected utility. © 2021 International conference on Cognitive modelling

关键词： Decision making

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Analysis and modelling of the energy dissipation behaviour of velocity and displacement dependent hydraulic dampers

Analysis and modelling of the energy dissipation behaviour o...

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10th International conference on Civil, Structural and Environmental engineering Computing, Civil-Comp 2005

作者： Sung, W.-P. Shih, M.-H. Department of Landscape Design and Management National Chinyi Institute of Technology Taichung Taiwan Department of Construction Engineering National Kaoshiang First University of Science and Technology Kaoshiang Taiwan

ISBN: (纸本)1905088000

The new oil-pressure damper is installed with an additional Relief Valve parallel to the Throttle Valve to change its aperture size. This is intended to obtain the adaptive control by changing the damping coefficient of the damper. In order to simulate its actual energy elimination, a serial friction model and a small damper parallel to the friction model, added to Maxwell Model, is proposed in this study to derive a mathematical analysis model and compare it with the experimental behaviours of energy eliminations. The numerical verifications show that the mathematical analysis model can accurately simulate the relation of force and displacement and the relation of force and velocity during the process of energy dissipation. Therefore, the derived mathematical model is considerably accurate. © 2005 Civil-Comp Press.

关键词： Energy dissipation

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modelling, control system design and simulation of an autonomous bicycle

Modelling, control system design and simulation of an autono...

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IASTED International conference on modelling, Identification and Control, MIC 2014

作者： Argin, Omer Faruk Bayraktaroglu, Zeki Yagiz Faculty of Mechanical Engineering Istanbul Technical University MA1 Gumussuyu 34437 Istanbul Turkey

This paper presents the mathematical modelling and control system design of an autonomous bicycle. The nonlinear equations of motion have been derived and the proposed control system has been used in the simulation of the dynamical behaviour of the bicycle. With the assumption of rolling without slipping condition for the wheels-ground interaction, the system is constrained by nonholonomic equations, and the equations of motion are highly nonlinear. Unlike many other approaches present in related literature, the dynamical model is preserved in simulations in its original nonlinear form without any simplifying assumptions and linearization. Numerical results of the simulations show that the proposed closed-loop control system is achievable. Design of the experimental system has been based on a commercially available bicycle. The mechanical modifications and control system hardware have been designed according to the simulation results.

关键词： Equations of motion

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Comparative performance analysis of aluminum- and copper-rotor induction generators in standalone wind power application

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COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC engineering 2010年第5期29卷 1309-1324页

作者： Hafiz, Khurshid Nanda, Gaurav Kar, Narayan C. Univ Windsor Dept Elect & Comp Engn Windsor ON N9B 3P4 Canada

Purpose - In order to assess the performance of an induction generator in standalone wind power application, it is imperative that mathematical models are developed that accurately represent the system and take into account various electromagnetic influences such as skin effect. The purpose of this paper is to utilize mathematical models to study the transient and steady-state behaviour of the self-excited induction generator (SEIG), in one case with an aluminum rotor, in another case, with a copper rotor, under various load conditions while taking the above factor into account. Design/methodology/approach - mathematical models of a SEIG in the d-q axis frame have been developed based on the generalized machine theory. A relationship between the mutual inductance and the magnetizing current of the machine has been presented. The rotor impedances have been customized to include skin effect. Using these relations, the model has been extended to include the saturation and skin effects. In order to verify the accuracy of the models, numerical and experimental investigations have been carried out on two 7.5 hp aluminum-rotor and copper-rotor SEIGs. Findings - It was found that the model that takes into account the saturation and skin effects produces numerical results that closely match experimental values for both the machines. Originality/value - This paper describes how a model of an SEIG considering saturation and skin effect has been developed and applied to aluminum- and copper-rotor machines of similar power ratings to analyze their performance.

关键词： Generators Inductance Wind power modelling

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