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13th International Joint conference on Biomedical engineering Systems and Technologies

作者： Fernandes, Leticia Barandas, Marilia Gamboa, Hugo Assoc Fraunhofer Portugal Res Rua Alfredo Allen 455-461 P-4200135 Porto Portugal Univ Nova Lisboa Lab Instrumentacao Engn Biomed & Fis Radiacao LIB Dept Fis Fac Ciencias & Tecnol P-2829516 Monte De Caparica Caparica Portugal

ISBN: (纸本)9789897583988

The world's population is ageing, increasing the awareness of neurological and behavioural impairments that may arise from the human ageing. These impairments can be manifested by cognitive conditions or mobility reduction. These conditions are difficult to be detected on time, there is a lack of routine screening which demands the development of solutions to better assist and monitor human behaviour. This study investigates the question of what we can learn about human behaviour patterns from the rich and pervasive mobile sensing data. Data was collected over 6 months, measuring two different human routines through human trajectory analysis and activity recognition comprising indoor and outdoor environment. A framework for modelling human behaviour was developed using human motion features, extracted with and without previous knowledge of the user's behaviour. The human patterns were modelled through probability density functions and clustering approaches. Using the learned patterns, inferences about the current human behaviour were continuously quantified by an anomaly detection algorithm where distance measurements were used to detect significant changes in behaviour. Experimental results demonstrate the effectiveness of the proposed framework that revealed an increased potential to learn behavioural patterns and detect anomalies.

关键词： human behaviour Pattern Recognition Anomaly Detection Ambient Assisted Living Probability Density Function Clustering

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Component-Based Dynamic Load Modeling of a Paper Mill

Component-Based Dynamic Load Modeling of a Paper Mill

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22nd Australasian Universities Power engineering conference (AUPEC) - Green Smart Grid Systems

作者： Wong, K. E. Haque, M. E. Davies, M. Univ Tasmania Sch Engn Hobart Tas Australia Transend Networks Pty Ltd Transmiss Operat Grp Hobart Tas Australia

ISBN: (纸本)9789791884723

Load modelling has always been a key missing part in power system analysis especially in transient stability studies. In the Tasmanian power system, about half the load demand comes from industrial loads and some comprise large rotating machines. Therefore, modelling of these loads has to consider their behaviour during disturbances. This paper looks to develop a mathematical load response model for a paper mill connected to the power system. The developed model is based on component-based load modelling approach. A PSCAD model of the paper mill is constructed from available information on the types of loads within the mill. Simulations are then run to study its responses to disturbances. The load model is developed for both voltage and frequency changes but each of them is considered separately. Both voltage and frequency disturbances are then applied during simulations of the paper mill to investigate the combined effect of voltage and frequency disturbances. With this model, the source of each transient response can be easily identified, which can be useful for future mitigation work to avoid system instability issues.

关键词： dynamic load modelling mathematical load response model component based load model

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Thermochemical modelling of glass reinforced plastic pipes

Thermochemical modelling of glass reinforced plastic pipes

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10th International Offshore and Polar engineering conference (ISOPE-2000)

作者： Looyeh, MRE Robert Gordon Univ Aberdeen AB9 1FR Scotland

ISBN: (纸本)1880653508

Glass reinforced plastic (GRP) pipes are increasingly being used in the offshore industry and their behaviour in fire is studied using mathematical and numerical modelling. The thermochemical response of a single-skinned GRP pipe exposed to hydrocarbon fires is modelled using the finite element technique. Axi-symmetric mathematical and numerical models are developed to quantify the fire performance of thin-walled and large diameter GRP pipes for seawater transport. The mathematical model is based on one-dimensional models developed for single-skinned GRP pipes and panels and include: (i) transient heat conduction;(ii) radial gas mass movement;(iii) mass loss and Arrhenius rate decomposition of resin material and (iv) endothermicity of the decomposition process. The numerical results are presented for a polyester-based GRP pipe with flowing seawater and thickness 1.09cm and compared with those for GRP panels and pipes with the same thicknesses but different boundary conditions. It is shown that for a given set of dimensions and boundary conditions, GRP pipes reach insulation failure (time to 160 degrees C) earlier than GRP panels. The results can be used, in conjunction with the author's previous work (Looyeh & Bettess, 1996), to assess the feasibility of using GRP for offshore pipes and pipelines where severe fire conditions may occur.

关键词： axi-symmetric finite element method glass reinforced plastics offshore structures pipes seawater thermochemical decomposition

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Qualitative modelling for dynamic magnetic hysteresis

Qualitative modelling for dynamic magnetic hysteresis

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Joint conference on Electromotion/IEEE Aegean conference on Electrical Machines and Power Electronics/

作者： Mordjaoui, M. Chabane, M. Boudjema, B. Electrical E gineering Department University of Skikda

ISBN: (纸本)9781424408900

The studies of practical magnetic systems with hysteresis phenomenon are of great importance in electrical engineering. As an alternative to physical and empirical model, a qualitative model was constructed using adaptive fuzzy logic called adaptive network fuzzy inference system (ANFIS). The proposed model demonstrates the modelling and accurate capability of a hybrid system to a nonlinear dynamic hysteresis. It has been used to model the hysteresis curve versus frequency. Firstly, mathematical modeling of the dynamic hysteresis is established and then, data gathered from this model is employed to create an ANFIS model of the system. Both mathematical and ANFIS model is compared, it is shown that the proposed model can restore hysteresis cycles with a little RMS error.

关键词： ANFIS Preisach hysteresis model dynamic behaviour magnetic core

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Mitral valve finite-element modelling from ultrasound data: a pilot study for a new approach to understand mitral function and clinical scenarios

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PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-mathematical PHYSICAL AND engineering SCIENCES 2008年第1879期366卷 3411-3434页

作者： Votta, Emiliano Caiani, Enrico Veronesi, Federico Soncini, Monica Montevecchi, Franco Maria Redaelli, Alberto Politecn Milan Dept Bioengn I-20133 Milan Italy Politecn Torino Dept Mech I-10129 Turin Italy

In the current scientific literature, particular attention is dedicated to the study of the mitral valve and to comprehension of the mechanisms that lead to its normal function, as well as those that trigger possible pathological conditions. One of the adopted approaches consists of computational modelling, which allows quantitative analysis of the mechanical behaviour of the valve by means of continuum mechanics theory and numerical techniques. However, none of the currently available models realistically accounts for all of the aspects that characterize the function of the mitral valve. Here, a new computational model of the mitral valve has been developed from in vivo data, as a first step towards the development of patient-specific models for the evaluation of annuloplasty procedures. A structural finite-element model of the mitral valve has been developed to account for all of the main valvular substructures. In particular, it includes the real geometry and the movement of the annulus and papillary muscles, reconstructed from four-dimensional ultrasound data from a healthy human subject, and a realistic description of the complex mechanical properties of mitral tissues. Preliminary simulations allowed mitral valve closure to be realistically mimicked and the role of annulus and papillary muscle dynamics to be quantified.

关键词： mitral valve finite-element modelling three-dimensional real-time echocardiography

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Using participatory paradigm to learn human behaviour

Using participatory paradigm to learn human behaviour

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1st International conference on Knowledge and Systems engineering, KSE 2009

作者： Taillandier, Patrick Chu, Thanh-Quang ngo 42 Ta Quang Buu Ha Noi Viet Nam

ISBN: (纸本)9780769538464

Since the end of the seventies, the utilisation of multi-agents simulations has spread out. A typical use of these simulations concerns the modelling of human behaviour. In this application case, a key point to ensure the simulation realism is the definition of the agent behaviour. Unfortunately, designing such behaviour is often complex. In order to help the definition of human behaviour, we propose an approach based on the participatory paradigm. In our approach, a human actor directly plays the role of an agent in the simulation. Knowledge about its behaviour is extracted from analysis of the logs. In this context, we propose to formalise the human behaviour by means of utility functions. An experiment, carried out in the domain of rescue simulation, is presented. This first experiment shows promising results for our approach. © 2009 IEEE.

关键词： Behavioral research

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modelling the granular medium dynamics on rough vibrating plane using method of large particles 30

Modelling the granular medium dynamics on rough vibrating pl...

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30th International conference of Young Scientists and Students - Topical Problems of Mechanical engineering (TopME)

作者： Lyan, I. P. Panovko, G. Y. Russian Acad Sci IMASH RAN Mech Engn Res Inst Moscow Russia BMSTU Moscow Russia

The article represents the results of mathematical modelling of behaviour of the granular medium on an oscillating rough surface. Granular medium under the action of vibration is considered as a non-Newtonian (dilatant) fluid. The system of differential equations of continuum mechanics is solved using the modified large particles method. An algorithm for solving the problem for granular media with different properties under external influences is proposed.

关键词： Continuum mechanics

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A review of bioregulatory and coupled mechanobioregulatory mathematical models for secondary fracture healing

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MEDICAL engineering & PHYSICS 2017年 48卷 90-102页

作者： Wang, Monan Yang, Ning Harbin Univ Sci & Technol Mech & Power Engn Coll Harbin Heilongjiang Peoples R China

Fracture healing is a complex biological process involving many cellular and molecular events. During fracture healing, biochemical signals play a regulatory role in promoting the healing process. Although many experiments have been conducted to study fracture healing, not all of the mechanisms are clearly understood. Over the past years, a lot of mathematical models and computational simulations have been established to investigate the fracture healing process. These models offer a powerful tool to study the interplay between cell behaviour, mechanical stimuli and biochemical signals and help design new treatment strategies. However, most of the mathematical models focus on the effect of mechanical stimuli and few models consider the important role of biochemical signals during fracture healing. In this review, we first emphasize the importance of biochemical signals during fracture healing. Then, existing bioregulatory and coupled mechanobioregulatory models are presented. Finally, some limitations and possible solutions are discussed. (C) 2017 IPEM. Published by Elsevier Ltd. All rights reserved.

关键词： Fracture healing Biochemical signals mathematical modelling

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Numerical modelling of free surface flows in metallurgical vessels

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APPLIED mathematical modelling 2002年第2期26卷 113-140页

作者： Liovic, P Rudman, M Liow, JL Univ Melbourne Dept Chem Engn GK Williams Cooperat Res Ctr Extract Met Parkville Vic 3010 Australia CSIRO Div Bldg Construct & Engn Highett Vic 3190 Australia James Cook Univ N Queensland Sch Engn Townsville Qld 4811 Australia

A numerical model for simulating the transient behaviour of multi-fluid problems defined in 2D rectangular and cylindrical geometries is presented. The model uses a piecewise linear volume tracking scheme, and maintains sharp interfaces and captures fine-scale flow phenomena such as fragmentation and coalescence. The numerical model was applied to four problems of pyrometallurgical relevance - entrainment of matte in the flow of slag during skimming operations, splash resulting from a drop impinging on a bath, bubble rise in a liquid bath, and top-submerged gas injection. The numerical predictions are in good agreement with the published experimental results. The simulation of top-submerged gas injection showed, in detail, the phenomena of bubble formation, bubble rise, and splash drop formation and recoalescence with the bath. Data useful for engineering purposes such as pressure traces and time-averaged flow fields were obtained, allowing assessment of splash behaviour for given gas injection conditions. The numerical model has been shown to be versatile in being able to adapt to a wide range of multi-phase flow problems. (C) 2002 Elsevier Science Inc. All rights reserved.

关键词： volume tracking gas injection entrainment splash bubble rise

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Accurate robot simulation through system identification

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ROBOTICS AND AUTONOMOUS SYSTEMS 2008年第12期56卷 1082-1093页

作者： Kyriacou, T. Nehmzow, U. Iglesias, R. Billings, S. A. Univ Ulster Sch Comp & Intelligent Syst Coleraine BT48 7JL Londonderry North Ireland Univ Keele Sch Comp & Math Keele ST5 5BG Staffs England Univ Santiago de Compostela Dept Elect & Comp Sci Santiago De Compostela Spain Univ Sheffield Dept Automat Control & Syst Engn Sheffield S1 3JD S Yorkshire England

Robot simulators are useful tools for developing robot behaviour. They provide a fast and efficient means for testing robot control code at the convenience of the office desk. In all but the simplest cases though, due to complexities of physical systems modelled in the simulator, there are considerable differences between the behaviour of the robot in the simulator and that in the real world environment. In this paper we present a novel method to create a robot Simulator using real sensor data. Logged sensor data are used to construct a mathematically explicit model (in the form of a NARMAX polynomial) of the robot's environment. The advantage Of Such a transparent model in contrast to opaque modelling methods such as artificial neural networks-is that it can be analysed to characterise the modelled system, using established mathematical methods. In this paper we compare the behaviour of the robot running a particular task in both the simulator and the real-world using qualitative and quantitative measures including statistical methods to investigate the faithfulness of the simulator. (C) 2008 Elsevier B.V. All rights reserved.

关键词： Robot simulation System identification for simulation Robot modelling Quantitative assessment of computer simulations

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