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2011 7th International conference on Intelligent Environments, IE 2011

作者： Yordanova, Kristina Mobile Multimedia Information Systems Group Institute of Computer Science University of Rostock 18055 Rostock Germany

ISBN: (纸本)9780769544526

A problem in assisting users in intelligent environments is the detection of their long term intentions based on the current state. One approach to solving this problem is the employment of human behaviour models, such as CTML and PDDL. At present, most of these models are based on concrete domains or scenarios which makes them difficult or impossible to adapt for other use cases. To overcome this drawback, this paper introduces an approach that uses partial order planning for generating a user behaviour model. Furthermore, it proposes a generalization of human activities by introducing atomic action templates valid for activities from various domains. To illustrate the approach, a scenario from the elderly care domain is modelled. Overall, the paper provides an effective general approach for modelling human behaviour which can be embedded in the intention inference workflow. © 2011 IEEE.

关键词： Atoms

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Software component architecture for co-simulation applied to the coupling between a building's thermal envelope and its inhabitant behaviour

Software component architecture for co-simulation applied to...

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Annual conference on IEEE Industrial Electronics Society

作者： Sana Gaaloul Xuan Hoa Binh Le Benoit Delinchant Frederic Wurtz Stephane Ploix G2elab: Grenoble Electrical Engineering GSCOP: Grenoble Sciences for Design Optimization and Production

ISBN: (纸本)9781467324199

This paper proposes a co-simulation architecture based on software component standard. It proposes a pattern to unify the co-simulation interfaces of several building energy simulation tools. It will thus facilitate and generalize the establishment of a co-simulation. Advantages of this strategy are highlighted through the coupling between the software COMFIE for thermal envelope simulation and the tool BRAHMS for occupant behaviour simulator, in the Matlab/Simulink environment. Linking these two tools is essential to take profit from their specific skills in each area and ensure a detailed simulation of both precise physical models and computational models of human cognitive abilities. This is needed to ensure an efficient building control taking into account the complexity of this system.

关键词： MATLAB mathematical model Heating

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Dynamic behaviour of elastic cam devices driven by servomotors with PID velocity control

Dynamic behaviour of elastic cam devices driven by servomoto...

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2011 7th IEEE International conference on Automation Science and engineering, CASE 2011

作者： Incerti, Giovanni Department of Mechanical and Industrial Engineering State University of Brescia Via Branze 38 25123 Brescia Italy

ISBN: (纸本)9781457717307

A mathematical model for dynamic analysis of elastic cam devices driven by DC motors with velocity control is presented in this paper. Besides the dynamic modelling of the cam system, the model considers the electromagnetic behaviour of the motor and the response of the speed regulator, based on a standard PID (proportional, integral and derivative) algorithm. The proposed model can be used as design tool, to simulate actual cam servomechanisms with a good degree of reliability and to evaluate the effects due to a modification of the control system parameters. Some simulation results are included in the paper, to demonstrate the possibility of use of the model. © 2011 IEEE.

关键词： Cams

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Stochastic model of near-periodic jumping forces 8

Stochastic model of near-periodic jumping forces

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8th International conference on Structural Dynamics (EURODYN)

作者： Racic, Vitomir Pavic, Aleksandar Univ Sheffield Dept Civil & Struct Engn Sheffield S1 3JD S Yorkshire England

ISBN: (纸本)9789076019314

A mathematical model has been developed to generate stochastic synthetic vertical force signals induced by a single person jumping. The model is based on a unique database of experimentally measured individual jumping loads which has the most extensive range of possible jumping frequencies. The ability to replicate many of the temporal and spectral features of real jumping loads gives this model a definite advantage over the conventional half-sine models coupled with Fourier series analysis. This includes modelling of the omnipresent lack of symmetry of individual jumping pulses and jump-by-jump variations in amplitudes and timing. The model therefore belongs to a new generation of synthetic narrow band jumping loads which simulate reality better. The proposed mathematical concept for characterisation of near-periodic jumping pulses may be utilised in vibration serviceability assessment of civil engineering assembly structures, such as grandstands, spectator galleries, footbridges and concert or gym floors, to estimate more realistically dynamic structural response due to people jumping.

关键词： vibration serviceability human-structure dynamic interaction jumping modelling force load stadia grandstands floors footbridges

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Simulation of Multi-agent Manufacturing Systems using Agent-based modelling Platforms

Simulation of Multi-agent Manufacturing Systems using Agent-...

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9th IEEE International conference on Industrial Informatics (INDIN)

作者： Barbosa, Jose Leitao, Paulo Polytech Inst Braganca P-5301857 Braganca Portugal

ISBN: (纸本)9781457704345

Multi-agent systems (MAS) are driving the way to design and engineer control solutions that exhibit flexibility, adaptation and reconfigurability, which are important advantages over traditional centralized systems. The understanding, design and testing of such distributed agent-based approaches, and particularly those exhibiting self-* properties, are usually a hard task. Simulation assumes a crucial role to analyse the behaviour of MAS solutions during the design phase and before its deployment into the real operation. Particularly, Agent-Based modelling (ABM) tools are well suited to simulate MAS systems that exhibit complex phenomena, like emergent behaviour and self-organization. This paper discusses the simulation of agent-based manufacturing systems and introduces the advantages of using ABM tools. The NetLogo platform is used to illustrate the benefits of such tools in the manufacturing world on the specification of a MAS system for a washing machine production line.

关键词： ABM tools Analytical models Computational modeling Control systems MAS solutions Manufacturing mathematical model NetLogo platform Production Solid modeling agent-based modelling platforms design phase distributed agent-based approaches manufacturing systems multi-agent systems multiagent manufacturing systems production engineering computing washing machine production line washing machines

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Multiple Characterisation modelling of Friction Stir Welding Using a Genetic Multi-objective Data-driven Fuzzy modelling Approach

Multiple Characterisation Modelling of Friction Stir Welding...

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IEEE International conference on Fuzzy Systems (FUZZ 2011)

作者： Zhang, Qian Mahfouf, Mahdi Panoutsos, George Beamish, Kathryn Norris, Ian Univ Sheffield Dept Automat Control & Syst Engn Sheffield S Yorkshire England TWI Ltd Cambridge England

ISBN: (纸本)9781424473175

Friction Stir Welding (FSW) is a relatively new solid-state joining technique, which is versatile, environment friendly, and energy and time efficient. For a comprehensive understanding of the effects of process conditions, such as tool rotation speed and traverse speed, on characterisations of welded materials, it is essential to establish prediction models for different aspects of the materials' behaviours. Because of the high complexity of the FSW process, it is often difficult to derive accurate and yet transparent enough mathematical models. In such a situation, a systematic data-driven fuzzy modelling approach is developed and implemented in this paper to model FSW behaviour relating to AA5083 aluminium alloy, consisting of microstructural features, mechanical properties, as well as overall weld quality. This methodology allows constructing transparent fuzzy models considering both accuracy and interpretability attributes of fuzzy systems. The elicited models proved to be accurate, interpretable and robust and can be further applied to facilitate the optimal design of process parameters, with the aim of finding the optimal combinations of process parameters to achieve desired welding properties.

关键词： friction stir welding aluminium alloy mechanical property microstructure weld quality fuzzy modelling multi-objective NSGA-II

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Towards a quantitative understanding of oxygen tension and cell density evolution in fibrin hydrogels

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BIOMATERIALS 2011年第1期32卷 107-118页

作者： Demol, Jan Lambrechts, Dennis Geris, Liesbet Schrooten, Jan Van Oosterwyck, Hans Katholieke Univ Leuven Div Biomech & Engn Design B-3001 Louvain Belgium Katholieke Univ Leuven Dept Met & Mat Engn B-3001 Louvain Belgium Katholieke Univ Leuven Div Skeletal Tissue Engn Leuven B-3001 Louvain Belgium

The in vitro culture of hydrogel-based constructs above a critical size is accompanied by problems of unequal cell distribution when diffusion is the primary mode of oxygen transfer. In this study, an experimentally-informed mathematical model was developed to relate cell proliferation and death inside fibrin hydrogels to the local oxygen tension in a quantitative manner. The predictive capacity of the resulting model was tested by comparing its outcomes to the density, distribution and viability of human periosteum derived cells (hPDCs) that were cultured inside fibrin hydrogels in vitro. The model was able to reproduce important experimental findings, such as the formation of a multilayered cell sheet at the hydrogel periphery and the occurrence of a cell density gradient throughout the hydrogel. In addition, the model demonstrated that cell culture in fibrin hydrogels can lead to complete anoxia in the centre of the hydrogel for realistic values of oxygen diffusion and consumption. A sensitivity analysis also identified these two parameters, together with the proliferation parameters of the encapsulated cells, as the governing parameters for the occurrence of anoxia. In conclusion, this study indicates that mathematical models can help to better understand oxygen transport limitations and its influence on cell behaviour during the in vitro culture of cell-seeded hydrogels. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Bone tissue engineering Fibrin Hydrogel In vitro test modelling

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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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modelling of fluid power transmission systems

Modelling of fluid power transmission systems

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IEEE International conference on Innovations in Intelligent Systems and Applications

作者： Abdul-Ameer, Alaa Faculty of Engineering British University in Dubai PO Box 345015 Dubai United Arab Emirates

ISBN: (纸本)9781612849195

The mathematical modelling of fluid power transmission systems involves solving a system of differential equations and addressing the problems generated by transient pressure propagation. The main difficulties in modelling pressurised, fluid pipelines arise from the complex interactions involving boundary conditions, reflections and non-linear behaviour. This paper presents a new method of modelling pipeline systems that provides an accurate transient response of the system incorporating a frequency-dependent fluid friction term. The modelling method employed is based upon distributed-lumped parameter modelling techniques which enable the inclusion of a wide variety of non-linear effects. The model comprises a distributed element representing the pressure and flow rate through out the length of the pipeline and a lumped element that represents the boundary conditions at the pipeline exit. The simulation results for the system are compared with experimental data validating thereby the analytical procedures proposed. © 2011 IEEE.

关键词： Pipelines

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A novel approach to modelling and simulation of the dynamic behaviour of the wheel-rail interface

A novel approach to modelling and simulation of the dynamic ...

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2011 17th International conference on Automation and Computing, ICAC 2011

作者： Anyakwo, Arthur Pislaru, Crinela Ball, Andrew Gu, Fengshou University of Huddersfield Diagnostics Engineering Research Centre Queensgate Huddersfield HD1 3DH United Kingdom

ISBN: (纸本)9781467300001

This paper presents a novel approach to modelling and simulation of the dynamic behaviour of rail-wheel interface. The proposed dynamic wheel-rail contact model comprises wheel-rail geometry and efficient solutions for normal and tangential contact problems. This two-degree of freedom model takes into account the lateral displacement of the wheelset and the yaw angle. Single wheel tread rail contact was considered for all simulations and Kalker's linear theory and heuristic non-linear creep models were employed. The second order differential equations are reduced to first order and the forward velocity of the wheelset is increased until the wheelset becomes unstable. A comprehensive study of the wheelset lateral stability is performed and is relatively easy to use since no mathematical approach is required to estimate the critical velocity of the dynamic wheel-rail contact model. This novel approach to modelling and simulation of the dynamic behaviour of rail-wheel interface will be useful in the development of intelligent infrastructure diagnostic and condition monitoring systems. The automated detection of the state of the track will allow informed decision making on asset management actions - especially in maintenance and renewals activities. © 2011 CACSUK.

关键词： Condition monitoring

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