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CAMiCS: Civilian activity modelling in constructive simulation

CAMiCS: Civilian activity modelling in constructive simulati...

Summer Computer Simulation conference 2008, SCSC 2008, Part of the 2008 Summer Simulation Multiconference, SummerSim 2008

作者： Levesque, Jérôme Cazzolato, François Perron, Jimmy Hogan, Jimmy Gruenwoldt, Leif Taff, Chris Center for Operational Research and Analysis Defence Research and Development Canada Kingston Canada NSim Technology Québec QC Canada Land Software Engineering Center Department of National Defence Kingston Canada

ISBN: (纸本)9781622763597

When conducting operations in urban environments, military units often have to deal with ongoing civilian activity, including vehicle and pedestrian traffic, pedestrian congregations and crowds. Despite the important role played by civilian activity in the conduct of military operations, simulations used for military training often fail to represent civilian entities appropriately, both in terms of density and behaviours. This paper introduces a new tool (CAMiCS) that simulates vehicle traffic and pedestrian behaviour on the scale of a whole town, for training and experimentation at the operational level. CAMiCS is implemented as a multi-agent simulation that represents basic human behaviour and urban traffic. It can be used by itself or in combination with existing simulations on a DIS/HLA network. Terrain representation in CAMiCS is done using a geographical information system (GIS), and is thus especially well-suited for experimentation with GIS-based command and control systems. This paper presents the concepts used for behaviour representation and traffic simulation, as well as the CAMiCS architecture. The benefits for training at the operational level are discussed. Finally, an example is presented where CAMiCS has been integrated to a scenario in JCATS (Joint Conflict And Tactical Simulation).

关键词： Command and control systems

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A comparative study of different constitutive relations of soil in modelling shallow tunnels

A comparative study of different constitutive relations of s...

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12th International conference on Computer Methods and Advances in Geomechanics 2008

作者： Fattah, Mohammed Y. Nareeman, Bestun J. Building and Construction Engineering Dept. University of Technology Iraq Dept. of Civil Engineering Kirkuk University Iraq

ISBN: (纸本)9781622761760

Constitutive models for soil are typically based on the same mathematical plasticity theory framework used to model common metals. However, the constitutive behaviour of soil differs from that of metals in different ways. The soil used in this paper was selected from the work of Azevedo et al. (2002). The work dealt with 2D finite element analysis of a shallow tunnel in the city of São Paulo, Brazil, through residual soils. The tunnel, approximately 103 m long, has a maximum width of 11.4 m. The thickness of the soil cover above the tunnel crown was 7.6 m. The support system consisted of a 0.20 m-thick primary shotcrete and a 0.15 m-thick secondary shotcrete liner. Three stages of excavation process were taken into consideration to simulate the actual behaviour of the tunnel during the excavation. In each stage, five increments are included. Numerical simulation of excavations is performed by releasing equivalent nodal forces defined by the in situ soil stresses existing along the excavation perimeter before construction. Different constitutive relations are used to describe the soil behavior including elastic, elastic-plastic, Cam clay and modified Cam clay models. The results of the tunnel application of the used constitutive models show the ability of a two-dimensional (especially using modified Cam clay model) finite element analysis to evaluate the deformations induced in residual soil by shallow tunnel excavations. The critical state line is approximately the same by both the Cam clay and modified Cam clay models. Both models revealed stress state above the critical state line due to slightly overconsolidation of the clay. The yield surface of the modified Cam clay is larger than that of Cam clay model under the same loading conditions.

关键词： Soils

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On Two‐Scale modelling of Heat and Mass Transfer

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AIP conference Proceedings 2008年第1期1048卷 570-574页

作者： J. Vala S. Št’astník Brno University of Technology Faculty of Civil Engineering CZ‐60200 Brno Veveří 95 Czech Republic

modelling of macroscopic behaviour of materials, consisting of several layers or components, whose microscopic (at least stochastic) analysis is available, as well as (more general) simulation of non‐local phenomena, complicated coupled processes, etc., requires both deeper understanding of physical principles and development of mathematical theories and software algorithms. Starting from the (relatively simple) example of phase transformation in substitutional alloys, this paper sketches the general formulation of a nonlinear system of partial differential equations of evolution for the heat and mass transfer (useful in mechanical and civil engineering, etc.), corresponding to conservation principles of thermodynamics, both at the micro‐ and at the macroscopic level, and suggests an algorithm for scale‐bridging, based on the robust finite element techniques. Some existence and convergence questions, namely those based on the construction of sequences of Rothe and on the mathematical theory of two‐scale convergence, are discussed together with references to useful generalizations, required by new technologies.

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A Millenson-Based Approach to Emotion modelling

A Millenson-Based Approach to Emotion Modelling

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2008 conference on human System Interactions (HSI 2008), vol.1

作者： William Blewitt Aladdin Ayesh Robert I. John Simon Coupland Centre for Computational Intelligence Montfort University Leicester UK

The issue of accurately modelling human emotions in agents has been the subject of extensive debate for some decades. This debate, complicated as it is by constant psychological arguments about the nature of emotions and their affects on behaviour, has given rise to many different schools of thought within the greater, overarching subject of affective computing. Our work centres around a fuzzy logic system, its goal being to more accurately model the emotional state, and changes of the emotional state, through usage of a three-dimensional emotion model. Within this paper we intend to outline our system for modelling emotional state and changes to emotional state. We shall include an outline of the psychological basis for our work, and discussion of basic implementation of the proposed system.

关键词： Computational modeling mathematical model Psychology Educational institutions Context modeling Cognition Shape

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A framework for reactive optimization in mobile ad hoc networks

A framework for reactive optimization in mobile ad hoc netwo...

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International conference on Information Technology (ICIT)

作者： Daniel W. McClary Violet R. Syrotiuk Murat Kulahci Computer Science & Engineering Arizona State University USA Informatics and Mathematical Modelling Technical University of Denmark Denmark

We present a framework to optimize the performance of a mobile ad hoc network over a wide range of operating conditions. It includes screening experiments to quantify the parameters and interactions among parameters influential to throughput. Profile-driven regression is applied to obtain a model of the non-linear behaviour of throughput. The intermediate models obtained in this modelling effort are used to adapt the parameters as the network conditions change, in order to maximize throughput. The improvements in throughput range from 10-26 times the use of the default parameter settings. The predictive accuracy of the model is monitored and used to update the model dynamically. The results indicate the framework may be useful for the optimization of dynamic systems of high dimension.

关键词： mathematical model Monitoring Throughput Computational modeling Equations Control charts Optimization

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Accurate Nonlinear Electron Device modelling for Cold FET Mixer Design

Accurate Nonlinear Electron Device Modelling for Cold FET Mi...

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European (Formerly European Gallium Arsenide and Other Semiconductors Application Symposium - EGASS) Microwave Integrated Circuit conference (EuMIC)

作者： Valeria Di Giacomo Alberto Santarelli Antonio Raffo Pier Andrea Traverso Dominique Schreurs Julio Lonac Davide Resca Giorgio Vannini Fabio Filicori Maurizio Pagani Italy Department of Electronics Information and Systems University of Bologna Bologna Italy Department of Engineering University of Ferrara Ferrara Italy Electronic Engineering Department Katholieke Universiteit Leuven Leuven Belgium MEC s.r.l. Bologna Italy Ericsson Laboratories Italy Vimodrone Italy

A nonlinear empirical model is here adopted to model the cold-FET behaviour of a GaAs PHEMT, in the framework of a resistive mixer application. The model, purely mathematical and technology independent, is suitably identified in the device operative region of interest and is validated in large-signal conditions by exploiting a measurements setup based on LS-VNA.

关键词： Electron devices FETs Voltage mathematical model Predictive models Integrated circuit modeling Design engineering Convolution Accuracy Frequency estimation

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A Kind of Formal modelling for Network Security Situational Awareness Based on HMM

A Kind of Formal Modelling for Network Security Situational ...

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International conference on Web-Age Information Management Workshops (WAIM)

作者： Ying Liang Huiqiang Wang Yonggang Pang Harbin Engineering of Technology China

ISBN: (纸本)9781424432004

Hidden Markov model (HMM) was introduced to model network security situational awareness (NSSA). The model was built from a novel perspective, both the distributions of anomaly behaviour and operational states of main network services were abstracted by Markov chain, modelling objects of HMM's dual stochastic process were constructed, classic Baum-Welch algorithm was used to estimate the parameters of the established mathematical model, and then the formal model for network security situational awareness based on HMM was constructed. Simulation experiments were done in local area network (LAN), and the obtained experimental results showed that the model could achieve quantitative descriptions for attacks and their impacts on security more precisely and effectively than the existing solutions, which helps to realize quantitative awareness for network security situation.

关键词： Hidden Markov models Security Stochastic processes mathematical model Training Analytical models Servers

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modelling genetic regulatory networks

Modelling genetic regulatory networks

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International conference on System Simulation and Scientific Computing, ICSC

作者： Le Yu Zhong Su Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK Beijing Information Science and Technology University Beijing China

A genetic regulatory network (GRN) is a dynamic system to describe interactions among a large number of different substances in a living biological cell. There have been numerous attempts to model the dynamical behaviour of genetic regulatory networks. Boolean models are a class of discrete models for modelling genetic regulatory networks, which are conditioned on the premise that genes interact with each other through Boolean logic. As mentioned previously, Boolean models include Boolean Networks, Instantaneously Random Probabilistic Boolean Networks and Context-Sensitive Boolean Networks. There are a large number of issues surrounding Boolean models, including Boolean Networks and Probabilistic Boolean Networks. The model inference is the procedure of determining whether the modelled networks are consistent with the given data sample, and choosing one model, from among many, that makes more sense for the data. This paper has reviewed the research into modelling gene regulatory networks, especially upon Boolean models.

关键词： Genetics Biological system modeling mathematical model Genomics Bioinformatics Predictive models Gene expression Biology computing Computer networks Computational modeling

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Digital simulation of induction and permanent magnet synchronous motor starting

Digital simulation of induction and permanent magnet synchro...

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International conference on Optimization of Electrical and Electronic Equipment, OPTIM

作者： L.N. Modran Engineering Faculty L. Blaga University of Sibiu Sibiu Romania

In electrical engineering education, modelling and dynamic simulation represent tools in order to understand the behaviour of the different components of electric drive- systems in transitory regimes. In this paper the direct, three steps rheostat, six pulses and PWM inverter starting of induction motor are simulated. The permanent magnet synchronous motor is modeled and starting also with PWM inverter. The model represents an experimental circuit and the oscillograms give the instantaneous electrical variables in every electrical equipment. The design of electrical devices and their interconnection can be proved without or before working in the laboratory in order to reduce the power consumption. The models and the simulation use the environment Matlab-Simulink.

关键词： Rotors Inverters mathematical model Stators Pulse width modulation Torque Equations

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3D Computer Simulations of Pulsatile human Blood Flows in Vessels and in the Aortic Arch: Investigation of Non-Newtonian Characteristics of human Blood

3D Computer Simulations of Pulsatile Human Blood Flows in Ve...

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IEEE International conference on Computational Science and engineering, CSE

作者： Renat A. Sultanov Dennis Guster Brent Engelbrekt Richard Blankenbecler Bus. Comput. Res. Lab. St. Cloud State Univ. Centennial St. Cloud NM Business Computer Information Systems Saint Cloud State University Saint Cloud MN USA

Methods of Computational Fluid Dynamics are applied to simulate pulsatile blood flow in human vessels and in the aortic arch. The non-Newtonian behaviour of the human blood is investigated in simple vessels of actual size. Turbulence effects are taken into account. A detailed time-dependent mathematical convergence test has been carried out. The realistic pulsatile flow is used in all simulations. Results of computer simulations of the blood flow in vessels of two different geometries are presented. For pressure, strain rate and velocity component distributions we found significant disagreements between our results obtained with realistic non-Newtonian treatment of human blood and widely used method in literature: a simple Newtonian approximation. A significant increase of the strain rate and, as a result, wall sear stress distribution, is found in the region of the aortic arch. We consider this result astheoretical evidence that supports existing clinical observations and those models not using non-Newtonian treatment underestimate the risk of disruption to the human vascular system.

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