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7th International conference on Smart and Sustainable Technologies, SpliTech 2022

作者： Osman, Kresimir Peric, Mato Zagreb University of Applied Sciences Department of Electrical Engineering Zagreb Croatia University North Department of Mechanical Engineering Varazdin Croatia

ISBN: (纸本)9789532901160

The research presented in this paper presents a framework with an algorithm intended for the development of complex technical systems during their operation in uncertain situations. It is based on the prediction of deviations in the behaviour of complex engineering systems with uncertain operating parameters relative to the behaviour of the same system with the predicted operating parameters. In this case, the unexpected behaviour of the system in a changing working environment is modelled with: the architecture model of a complex technical system and the behaviour model of the same technical system. The model of complex system architecture is based on a matrix representation of the system components using a component Design Structure matrix (DSM) component. A mathematical model with distributed parameters and a model predictive control (MPC) method is used to describe the behavioural model of a complex system. Observed system stability is also verified using the direct Lyapunov method. Bilateral mapping of the obtained data between these two models allows describing and modelling the system behaviour in uncertain situations. The recording of the behaviour of the created complex system is performed using the rules of fuzzy logic. For this purpose, the Adaptive-Network-based Fuzzy Inference System (ANFIS) is used. Verification of the research results was carried out on a real example of a complex technical system - an air handling unit. © 2022 University of Split, FESB.

关键词： Large scale systems

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Understanding human Social Communication: A Computational Model of Gossip 19

Understanding Human Social Communication: A Computational Mo...

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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： Lee, Jeungmin Kralik, Jerald D. Jeong, Jaeseung Department of Bio and Brain Engineering Program of Brain and Cognitive Engineering College of Engineering KAIST Daejeon34141 Korea Republic of Department of Bio and Brain Engineering College of Engineering KAIST Daejeon34141 Korea Republic of

ISBN: (纸本)9780998508252

Updating people about the actions of others—social communication—is a powerful means by which humans learn about the world and maintain stable societies. However, how the mind/brain achieves this ability computationally remains unclear. Our goal is to model when, how, and why people choose to communicate information about others to others. Here we present current progress. We first describe our social communication framework, the test paradigm for model development and assessment, and an empirical experiment we conducted to obtain novel data to test model predictions. We then present our model, and compare it with two others. Our model outperformed the others, capturing the main patterns of the empirical data and matching the specific results most closely (i.e., percent of cases deciding to communicate about a target individual). Thus, our model successfully simulates human social decision-making, helping to understand how it is achieved by the human mind/brain. © 2021 International conference on Cognitive modelling

关键词： Decision making

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Measuring and modelling the Effect of Inorganic Phosphate on Cross-bridge Mechanics in human Cardiac Muscle

Measuring and Modelling the Effect of Inorganic Phosphate on...

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45th Annual International conference of the IEEE-engineering-in-Medicine-and-Biology-Society (EMBC)

作者： Musgrave, Julia H. Han, June-Chiew Ward, Marie-Louise Taberner, Andrew J. Tran, Kenneth Univ Auckland Auckland 1010 New Zealand

ISBN: (纸本)9798350324471

Many common chronic diseases operate at the intersection of metabolic and cardiovascular dysfunction. In order to model the effects of these diseases and investigate underlying causes we are developing a cardiomyocyte model which incorporates both the mechanics and metabolic factors that underlie work done by the heart. In this paper we present the first experimental results from our study measuring mechanical properties in human cardiac trabeculae, including the effect of inorganic phosphate (Pi) on the complex modulus at 37 degrees C. Extending our previous mathematical model, we have developed a computationally efficient model of cardiac crossbridge mechanics which is sensitive to changes in cellular Pi. This extended model was parameterised with human cardiac complex modulus data. It captured the changes to cardiac mechanics following an increase in Pi concentration that we measured experimentally, including a reduced elastic modulus and a right-shift in frequency. The human cardiac trabecula we studied had a low sensitivity to Pi compared to what has been previously reported in mammalian cardiac tissue, which suggests that the muscle may have cellular compensatory mechanisms to cope with elevated Pi levels. This study demonstrates the feasibility of our experimental-modelling pipeline for future investigation of mechanical and metabolic effects in the diseased human heart.

关键词： Heart

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FSI study on the human veins 12

FSI study on the human veins

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12th International conference on Pressure Surges

作者： Simäo, M. Ferreira, J.M. Mora-Rodnguez, J. Ramos, H.M. CEHIDRO Instituto Superior Técnico University of Lisbon Lisbon Portugal Molecular Medicine Institute Faculty of Medicine University of Lisbon Lisbon Portugal Geomatics and Hydraulic Engineering Department Universidad de Guanajuato Mexico

ISBN: (纸本)9781510817180

In this study a computational fluid dynamic (CFD) model is used to study the problem associated with the formation of thrombus by the analysis of flow dynamics in human vein and its venous vaLves. Many fundamental issues of the blood flow behaviour seem stilt not fully understood of the point of view of hemodynamics. Therefore, it is important to understand the physics of vein valves in the identification of possible actions for venous diseases. An Arbitrary Lagrangian-Eulerian (ALE) formulation is employed to study the interaction between the viscous flow and the elastic body. The mathematical modelling of the blood flow and its interaction with the vein walls is simulated, using the finite element method (FEM), and validated using in vivo Echo-Doppler measurements. © BHR Group 2015.

关键词： Finite element method

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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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modelling and Simulation of Offshore Crane Operations on a Floating Production Vessel

Modelling and Simulation of Offshore Crane Operations on a F...

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Proceedings of the Twelfth (2002) International Offshore and Polar engineering conference

作者： Than, Thuong Kim Langen, Ivar Birkeland, Oddvar Stavanger University College N-4068 Stavanger Norway Hydralift ASA N-4604 Kristiansand Norway

This present paper deals with mathematical modelling of the crane's mechanical, hydraulic, and control systems as well as the numerical simulation of offshore cranes performing sealift operations. The simulations are performed by FEDEM - a general non-linear dynamic analysis program for flexible multibody systems. The pedestal, the revolving crane superstructure called crane king, and the boom are flexible links modelled by shell finite elements and connected together by different joints. A mathematical model of the hydraulic system and a control system is implemented in the mechanism model, making it possible to realistically control the operation of the crane. The results from the dynamic simulations verify that the virtual crane gives a very good picture of the dynamic behaviour of the real crane in offshore environment. This study shows how dynamic amplification can be reduced by proper operation and design of the hydraulic and control system. Simulation examples are shown for sealift from supply vessel when both the supply vessel and the FPSO (Floating Production, Storage and Offloading vessel) are subjected to wave induced forces.

关键词： Floating cranes

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Mixed Initiative Systems for human-Swarm Interaction: Opportunities and Challenges 2

Mixed Initiative Systems for Human-Swarm Interaction: Opport...

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2nd Annual Systems modelling conference, SMC 2018

作者： Hussein, Aya Abbass, Hussein School of Engineering and Information Technology UNSW Canberra Australia

ISBN: (纸本)9781538665831

human-swarm interaction (HSI) involves a number of human factors impacting human behaviour throughout the interaction. As the technologies used within HSI advance, it is more tempting to increase the level of swarm autonomy within the interaction to reduce the workload on humans. Yet, the prospective negative effects of high levels of autonomy on human situational awareness can hinder this process. Flexible autonomy aims at trading-off these effects by changing the level of autonomy within the interaction when required;with mixed-initiatives combining human preferences and automation's recommendations to select an appropriate level of autonomy at a certain point of time. However, the effective implementation of mixed-initiative systems raises fundamental questions on how to combine human preferences and automation recommendations, how to realise the selected level of autonomy, and what the future impacts on the cognitive states of a human are. We explore open challenges that hamper the process of developing effective flexible autonomy. We then highlight the potential benefits of using system modelling techniques in HSI by illustrating how they provide HSI designers with an opportunity to evaluate different strategies for assessing the state of the mission and for adapting the level of autonomy within the interaction to maximise mission success metrics. © 2018 IEEE.

关键词： human engineering

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Application of Self-Adaptive Techniques to Federated Authorization Models

Application of Self-Adaptive Techniques to Federated Authori...

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34th International conference on Software engineering (ICSE)

作者： Bailey, Christopher Univ Kent Sch Comp Canterbury Kent England

ISBN: (纸本)9781467310673

Authorization infrastructures are an integral part of any network where resources need to be protected. As organisations start to federate access to their resources, authorization infrastructures become increasingly difficult to manage, to a point where relying only on human resources becomes unfeasible. In our work, we propose a Self-Adaptive Authorization Framework (SAAF) that is capable of monitoring the usage of resources, and controlling access to resources through the manipulation of authorization assets (e.g., authorization policies, access rights and sessions), due to the identification of abnormal usage. As part of this work, we explore the use of models for facilitating the autonomic management of federated authorization infrastructures by 1) classifying access behaviour exhibited by users, 2) modelling authorization assets, including usage, for identifying abnormal behaviour, and 3) managing authorization through the adaptation and reflection of modelled authorization assets. SAAF will be evaluated by integrating it into an existing authorization infrastructure that would allow the simulation of abnormal usage scenarios.

关键词： self-adaptation model driven engineering model transformation authorization computing security

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Modeling human Activities Using behaviour Trees in Smart Homes 18

Modeling Human Activities Using Behaviour Trees in Smart Hom...

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11th ACM International conference on Pervasive Technologies Related to Assistive Environments (PETRA)

作者： Bouchard, Bruno Gaboury, Sebastien Bouchard, Kevin Francillette, Yannick Univ Quebec Chicoutimi LIARA Lab Chicoutimi PQ Canada

ISBN: (纸本)9781450363907

With the aging population, researchers around the world are investigating technological solutions to help seniors stay at home as long as possible. One of them is the concept of smart home, which is an intelligent house equipped with sensors and actuators. Aging people often suffers from physical and cognitive impairments, which limit their abilities to perform their Activities of Daily Living (ADL). Therefore, the smart home needs to be able to assist its resident in carrying out their ADL, when it is required. Recognising the ongoing ADL constitutes then a key challenge of the assistive services. Being able to simulate users' behaviour is also an important issue, as well as being able to find an assistive step-by-step solution when something goes wrong. However, all theses challenges need to rely on a knowledge base of activities' models. In the past, many researchers tried to make use of some logical encoding of the activities by exploiting, for instance, first order logic. These approaches work fine for the inferential process but they are very rigid, complex and time consuming. More recently, scientists in the field tried to represent the activities using stochastic models, such as Bayesian Networks or Markov Model. These probabilistic methods do not represent activities very naturally and are very static state-transition models. In this paper, we propose the use of behaviour Trees (BT) as a means to represent the user's ADL in a smart home. BTs are mainly used in the video game industry as a powerful tool to model the behaviour of non-player characters. BTs allow the modelling of activities with a flexible, well-defined approach. We will present a first exploitation of the behaviour trees in a smart home simulator.

关键词： Aging people Assistive Technology Smart Homes Activities modelling behaviour Tress Simulation

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Reusing simulated evacuation behaviour in a game engine 2014

Reusing simulated evacuation behaviour in a game engine

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10th Australian conference on Interactive Entertainment, IE 2014

作者： Xi, Mingze Smith, Shamus P. School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW2308 Australia

ISBN: (纸本)9781450327909

Virtual environments have been used to develop fire evacuation training systems which benefit from high levels of graphical realism and various interaction methods. However, virtual environment-based fire evacuation training systems often have limited non player character (NPC) behaviours as realistic fire evacuation models are difficult to build as they require accurate fire science, for example the impact of poisonous gases, smoke, and heat on human behaviour. One solution is the reuse of fire evacuation modelling tools to drive NPC behaviours in virtual environments built with gaming technology. In this paper, a pipeline is proposed to embed human behaviour, based on realistic fire science knowledge, into virtual evacuation training systems. The pipeline starts with 3D building models and extracts simulated human behaviour from fire evacuation simulator tools and then integrates these behaviours into NPC movement scripts for use in a game engine. A case study is presented with 3D modelling in SketchUp, simulated behaviour in FDS + Evac and NPC scripts in Unity3D. Consistent evacuation time was found on overall egress time in both FDS+Evac and Unity3D. A scalability analysis of environment complexity showed a linear increase in evacuation time by scenario scale in Unity3D and FDS+Evac. © 2014 ACM.

关键词： Virtual reality

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