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1
Content available Micro- vs. Macro scope simulation in BPM modelling
Pietroń R.
Information Systems in Management
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2018
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Vol. 7, No. 4
246--257
EN
The business structure and process development in many modern companies is assisted by architectures, frameworks, and a new generation of computer systems with a broad representation of methods and tools of design and modelling, i.e. object-oriented, event-oriented, activity-oriented, process-oriented, agent-oriented, communication-oriented, behaviour-oriented, etc. are recommended. The aim of this paper is to compare micro- vs. macro scope modelling and to investigate the relevance of micro- and/or macro simulation in the context of business process management (BPM) modelling for organizational design/redesign. The BPM modelling features and some specific issues of simulation modelling are discussed. Combined with BPM modelling methodologies, these issues are used to drive a concept for development of an integrated methodology for BPM models’ building and simulation approach in organizational BPM design/redesign projects.
2
Content available Model matematyczny przepływu ruchu ulicznego w skali makroskopowej
Abrahamowicz E., Orłowski P.
Pomiary Automatyka Robotyka
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2017
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R. 21, nr 3
5--10
PL
Modele matematyczne, będące uproszczoną reprezentacją zachodzących zjawisk, pozwalają na prognozowanie przyszłych stanów. Jest to szczególnie istotne w odniesieniu do problemu przeciążonej infrastruktury drogowej w obszarach miejskich oraz możliwości poprawy tej sytuacji przez zastosowanie inteligentnych algorytmów sterowania. Zaproponowany autorski, dyskretny, nieliniowy model matematyczny reprezentujący przepływ ruchu ulicznego w skali makroskopowej umożliwia przeprowadzenie testowania nowych rozwiązań sterowania przed ich wdrożeniem do realnego systemu. Badania symulacyjne, przeprowadzone z wykorzystaniem środowiska MATLAB, zostały wykonane w celu weryfikacji poprawności działania modelu. Obejmują one scenariusze wolnego przepływu pojazdów oraz blokowania się drogi. Wskazana została również możliwość rozbudowy modelu o złożone ciągi dróg oraz skrzyżowań.
EN
Mathematical models, which are a simplified representation of the phenomena, allow to predict future states. This is particularly important with regard to the problem of congested road infrastructure in urban areas and the possibility of improving this situation through the use of intelligent control algorithms. The proposed discrete, nonlinear mathematical model representing traffic flow on a macroscopic scale enables the testing of new control solutions prior to implementation to the real system. MATLAB simulations are performed to validate the model. These include scenarios of a free flow of vehicles and road blockages.
3
Content available remote Quantitative Ultrasound of Cancellous Bone. Modeling and Experiment
Pakuła M.
Image Processing & Communications
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2012
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Vol. 17, no. 4
23--30
EN
The paper present theoretical and experimental issues related to application of Quantitative Ultrasound (QUS) for assessment of cancellous bone quality and prediction of bone fractures. Commonly used for modeling of ultrasonic wave propagation in cancellous bone, the macroscopic Biot’s theory is discussed in context of its potential applicability for theoretical prediction of wave parameters: phase velocity and attenuation coefficient as functions of frequency. The analysis of the model is focused on the absorption mechanisms responsible for attenuation of ultrasonic waves in cancellous bone, which based on the ultrasonic experiments presumably play a predominant role in the total attenuation. The suitability of the model is discussed and verified by comparison of results of sensitivity analysis of the model with ex vivo experimental ultrasonic data obtained for cancellous bones filled with different fluids.
4
Content available remote Macroscopic modelling and simulation of two-phase copper matrix materials subjected to tensile deformation
Kosec B., Kampus Z., Kosec L., Kosel F.
Journal of Achievements in Materials and Manufacturing Engineering
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2006
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Vol. 15, nr 1-2
114--119
EN
Purpose: Phenomena of deformation and fracture of two-phase metal matrix materials are two very interesting problems in the sceintific field of materials science and engineering. The study of these two issues can greatly contribute to better mechanical and technological properties of two-phase metal matrix materials. Design/methodology/approach: This work presents macroscopic models of two-phase metal matrix material, composed of ductile matrix and more rigid and hard inclusions (inserts) of secondary phase, prepared for the tensile deformation. These types of models are enlarged for two to three orders of magnitude comparing to the real copper matrix materials, and they are suitable for numerical as well as experimental modelling and simulation. Findings: The basic aim of the numerical and experimental modelling is in the observation of the matrix material flow, and in analysis of the stress-strain state in the matrix. Research limitations/implications: Deficiencies in FEA of the tensile deformation process of represented models, are suppositions: that in the models a non-stressed initial state were supposed, that the secondary-phase inclusions and particles were simulated as perfect rigid bodies, and that the Coulumb coefficient of friction on the insert-matrix interface was assumed as a constant value. Practical implications: The changes of geometrical parameters of the tensile deformed macroscopic models have been experimentally observed with the hardness measurements, geometry measurements, image analysis, and non-destructive testing methods. Originality/value: The most important results of that macroscopic simulation is in the observation of the material flow, the formation and propagation of cracks, motion of the broken secondary-phase inclusions and particles in the matrix, and the stress-strain analysis.
5
Content available remote On the isotropic properties of a hexagonal - type rigid conductor
Siedlecka U., Wierzbicki E.
Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
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2005
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Vol. 4, nr 1
239-245
EN
A new macroscopic model for the non-stationary heat transfer processes in a periodic hexagonal-type anisotropic rigid conductor is formulated. The main aim of this contribution is to show that the macroscopic properties of this conductor are transversally isotropic. The tolerance averaging technique as a tool of macroscopic modelling is taken into account [1].
6
Content available remote A contribution to the macroscopic modelling of hyperbolic heat transfer in a micro-periodic rigid conductor
Siedlecka U.
Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
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2004
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Vol. 3, nr 1
195--200
EN
The aim of this contribution is to analyze the propagation of initial temperature disturbances on a macroscopic level. The main result of in this contribution is a formulation of an independent system of equations describing the above problem. The derived macroscopic heat transfer equations will be represented by the independent temperature disturbance equations and by the equation for the microscopic (averaged) temperature field. To make this note self-consistent we outline in the subsequent sections the basic preliminary concepts of the tolerance averaging technique. The detailed discussion of this technique can be found in [5].
7
Content available An averaged isotropic model of nonstationary heat transfer in anisotropic hexagonal-type condustors
Wierzbicki E., Siedlecka U.
Journal of Theoretical and Applied Mechanics
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2004
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Vol. 42 nr 4
755-770
EN
A new macroscopic model for non-stationary heat transfer processes in a periodic hexagonal-type anisotropic rigid conductor is formulated. The main aim of this contribution is to show that the macroscopic properties of such a conductor are transversally isotropic. The tolerance averaging technique as a tool of macroscopic modelling is taken into account.
PL
Celem pracy jest sformułowanie makroskopowego modelu niestacjonarnego przepływu ciepła w lokalnie anizotropowych heksagonalnych przewodnikach prostych. Jako narzędzie modelowania zastosowano technikę tolerancyjnego uśredniania. Sformułowano warunki wystarczające na to, by otrzymane równania były izotropowe. Zasadniczym rezultatem pracy jest wykazanie, że własności makroskopowe lokalnie anizotropowech przewodników mogą być transwersalnie izotropowe.
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