Wyniki wyszukiwania dla: parametric modelling, associative modelling - MOST Wiedzy

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Wyniki wyszukiwania dla: parametric modelling, associative modelling

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Wyniki wyszukiwania dla: parametric modelling, associative modelling

  • Brain perfusion imaging with the use of parametric modelling basing on DSC-MRI data

    Publikacja

    - Rok 2008

    W pracy do estymacji parametrów perfuzji mózgu: przepływu krwi mózgowej (cerebral blood flow, CBF), objętości krwi mózgowej (cerebral blood volume, CBV) oraz średniego czasu przejścia (mean transit time, MTT) wykorzystano pomiary DSC-MRI (Dynamic Susceptibility Contrast Magnetic Resonance Imaging). W modelowaniu danych MRI zastoswoano model trzykompartmentowy. Przedstawiono i porównano dwa podejścia do identyfikacji modelu różniące...

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  • Parametric versus nonparametric modelling of dynamic susceptibility contrast enhanced MRI based data

    Publikacja

    Dynamic tracking of a bolus of a paramagnetic agent (dynamic susceptibility contract - DSC) in MRI (magnetic resonance imaging) measurements is successfully used for assessment of the tissue perfusion and the other features and functions of the brain (i.e. cerebral blood flow - CBF, cerebral blood volume - CBV, mean transit time - MTT). The parametric and nonparametric approaches to the identification of MRI models are presented...

  • Improved Uniform Sampling in Constrained Domains for Data-Driven Modelling of Antennas

    Publikacja

    - Rok 2018

    Data-driven surrogate modelling of antenna structures is an attractive way of accelerating the design process, in particular, parametric optimization. In practice, construction of surrogates is hindered by curse of dimensionality as well as wide ranges of geometry parameters that need to be covered in order to make the model useful. These difficulties can be alleviated by constrained performance-driven modelling with the surrogate...

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  • Cost‐efficient performance‐driven modelling of multi‐band antennas by variable‐fidelity electromagnetic simulations and customized space mapping

    Electromagnetic (EM) simulations have become an indispensable tool in the design of contemporary antennas. EM‐driven tasks, for example, parametric optimization, entail considerable computational efforts, which may be reduced by employing surrogate models. Yet, data‐driven modelling of antenna characteristics is largely hindered by the curse of dimensionality. This may be addressed using the recently reported domain‐confinement...

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  • On the influence of the acceleration recording time on the calculation of impact severity indexes

    The paper concerns with the analysis of normative requirements pertaining to experimental setup of a crash test and its numerical modelling. An overview of parameters describing the collision of a vehicle with a road restraining system is presented. A short description of a concrete road safety barrier is presented. A brief description of numerical modelling procedures for crash tests is given as well. The parametric influence...

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  • Reduced-cost surrogate modelling of compact microwave components by two-level kriging interpolation

    Full-wave electromagnetic (EM) analysis is a versatile tool for evaluating the performance of high-frequency components. Its potential drawback is its high computational cost, inhibiting the execution of EM-driven tasks requiring massive simulations. The applicability of equivalent network models is limited owing to the topological complexity of compact microstrip components because of EM cross-coupling effects. Development of...

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  • APPLIED MATHEMATICAL MODELLING

    Czasopisma

    ISSN: 0307-904X , eISSN: 1872-8480

  • Novel analysis methods of dynamic properties for vehicle pantographs

    Publikacja

    - Rok 2018

    Transmission of electrical energy from a catenary system to traction units must be safe and reliable especially for high speed trains. Modern pantographs have to meet these requirements. Pantographs are subjected to several forces acting on their structural elements. These forces come from pantograph drive, inertia forces, aerodynamic effects, vibration of traction units etc. Modern approach to static and dynamic analysis should...

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  • Mathematical and numerical modelling, L, IDE, sem. 01, summer 21/22,(M:00057379)

    Kursy Online
    • K. J. Kaliński

    Modelling. Optimal control. Modal analysis. High speed milling. Mechatronic design.

  • Integrated membrane bioreactors modelling: A review on new comprehensive modelling framework

    Publikacja
    • J. Mąkinia
    • G. Mannina
    • M. Alliet
    • C. Brepols
    • J. Comas
    • J. Harmand
    • M. Heran
    • N. Kalboussi
    • Á. Robles
    • F. T. Rebouças... i 5 innych

    - BIORESOURCE TECHNOLOGY - Rok 2021

    Integrated Membrane Bioreactor (MBR) models, combination of biological and physical models, have been representing powerful tools for the accomplishment of high environmental sustainability. This paper, produced by the International Water Association (IWA) Task Group on Membrane Modelling and Control, reviews the state-of-the-art, identifying gaps for future researches, and proposes a new integrated MBR modelling framework. In...

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  • Mode choice modelling for urban areas

    Publikacja

    The article presents the question of mode choice modelling in a four-stage travel modelling process. The article indicates limitations of currently used simplified methods of mode choice modelling and presents the possibility of using a more detailed approach that accounts for additional, statistically significant factors with the use of advanced mathematical tools, discrete choice models. A need has also been identified to include...

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  • Simplified Distribution Grid Modelling for Connection Analyses

    Publikacja

    - Acta Energetica - Rok 2016

    This paper considers the modelling of medium and low voltage grids for the purpose of connection studies by distribution grid operators. Possible simplifications in grid modelling are discussed, which are acceptable from the viewpoint of the final result. The main driver of the modelling simplification is the MS Excel environment used as the computation platform, and the limitation of time for grid modelling.

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  • PHYSICAL MODELLING OF GEOTECHNICAL STRUCTURES IN PORTS AND OFFSHORE

    Publikacja

    The physical modelling of subsoil behaviour and soil-structure interaction is essential for the proper design of offshore structures and port infrastructure. A brief introduction to such modelling of geoengineering problems is presented and some methods and experimental devices are described. The relationships between modelling scales are given. Some examples of penetration testing results in centrifuge and calibration chamber...

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  • STATISTICAL MODELLING

    Czasopisma

    ISSN: 1471-082X , eISSN: 1477-0342

  • Method of Skeletal System Modelling

    An original method of skeletal system modelling is presented in detail. Using DICOM images obtained from CT and PET tests, shell models of nine bones were created (humerus, radius, ulna, scapula, clavicle, femur, tibia, fibula, pelvis). Two methods of bone behaviour are also proposed, the first method treating the bone as a solid structure and the second method treating the bone as a complex porous structure. The behaviour of model...

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  • Diagnostyka eksploatacyjna okrętowych silników spalinowych - tłokowych i turbinowych

    Publikacja

    - Rok 2017

    W monografii przedstawiono wybrane zagadnienia diagnostyki technicznej silników spalinowych dużej mocy, zarówno tłokowych, jak i turbinowych, ukierunkowane na eksploatację okrętowych (i nie tylko) systemów energetycznych, w których występują tego typu silniki. W początkowej części opracowania zaproponowano koncepcję systemowego ujęcia diagnostyki eksploatacyjnej silników okrętowych w aspekcie obowiązujących standardów światowych...

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  • Port-Based Modelling of Distributed-Lumped Parameter Systems

    Publikacja

    There in the paper is presented an uniform, port-based approach to modelling of both lumped and distributed parameter systems. Port-based model of the distributed system has been defined by application of bond graph methodology and distributed transfer function method (DTFM). The approach proposed combines versatility of port-based modelling and accuracy of distributed transfer function method. The concise representation of lumped-distributed...

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  • A comprehensive approach to double inverted pendulum modelling

    The problem of mathematical modelling and indication of properties of a DIP has been investigated in this paper. The aim of this work is to aggregate the knowledge on a DIP modelling using the Euler-Lagrange formalism in the presence of external forces and friction. To indicate the main properties important for simulation, model parameters identification and control system synthesis, analytical and numerical tools have been used....

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  • Modelling of pipes conveying flowing liquid

    Publikacja

    - Rok 2010

    The paper introduces the method of modal reduction of system which consists of pipe with flowing liquid. The concept of hybrid model is proposed. The system model consists of two parts, the modal model and the finite elements model. The modal model represents linear, self-adjoined part of the system, while simple lumped technique is applied for modelling of Coriolis phenomena.

  • Systems Analysis Modelling Simulation

    Czasopisma

    ISSN: 0232-9298

  • JOURNAL OF MOLECULAR GRAPHICS & MODELLING

    Czasopisma

    ISSN: 1093-3263 , eISSN: 1873-4243

  • Modelling of Geared Multi-Rotor System

    Publikacja

    In the paper the method of modelling a speed-varying geared rotor system is presented. The proposed approach enables us to obtain an accurate low-order lumped parameter representation of the investigated system. The final model consists of reduced modal models of an undamped beam/torsional shaft system as well as a spatially lumped model of other linear and nonlinear phenomena including gear mesh interaction.

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  • Modelling a 6-dof manipulator using Matlab software

    This paper presents an alternative approach to modelling a revolute robot. The manipulator in question is Kuka KR 16-2. The main problem in robot modelling is a kinematic analysis. The revolute robot consist of six rotary joints (6-DOF) with base, shoulder, elbow and wirst. The kinematics problem is defined as a transformation from the cartesian space to the joint space. The Denavit- Hartenberg (D-H) model of representation was...

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  • Modelling of Mechatronic Systems with Distributed Parameter Components

    Publikacja

    - Rok 2010

    The paper presents an uniform, port-based approach to modelling of both lumped and distributed parameter systems. Port-based model of distributed system has been defined by application of the bond graph methodology and the distributed transfer function method (DTFM). The proposed method of modelling enables to formulate input data for computer analysis by application of the DTFM. The computational package for the analysis of complex...

  • Modelling of power electronic compensators for the analysis of power system operation

    Publikacja

    The article presents selected methods of modelling power electronic compensators in order to analyze their operation in the power systems. Advantages and disadvantages of models have been shown with an indication of their usefulness for modelling specific phenomena.

  • Selected problems of decision making modelling in power engineering

    The paper presents the selected problems of decision making modelling in power engineering specially investment risk evaluation methods. The proposed model can be used in the range programming the development and investing process in power engineering. Decision making problems in power engineering and the evaluation of investment effectiveness in particular are closely related to modelling which relatively accurately reflects...

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  • A DISCRETE-CONTINUOUS METHOD OF MECHANICAL SYSTEM MODELLING

    Publikacja

    The paper describes a discrete-continuous method of dynamic system modelling. The presented approach is hybrid in its nature, as it combines the advantages of spatial discretization methods with those of continuous system modelling methods. In the proposed method, a three-dimensional system is discretised in two directions only, with the third direction remaining continuous. The thus obtained discrete-continuous model is described...

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  • Mathematical modelling and computer simulation of activated sludge systems.Second edition

    Publikacja

    Mathematical Modelling and Computer Simulation of Activated Sludge Systems – Second Edition, provides, from the process engineering perspective, a comprehensive and up-to-date overview regarding various aspects of the mechanistic (“white box”) modelling and simulation of advanced activated sludge systems performing biological nutrient removal. In the new edition of the book, a special focus is given to nitrogen removal and an overview...

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  • Advances in Modelling and Analysis of Strength of Corroded Ship Structures

    Publikacja

    The present study reviews the recent advances in modelling and analyses the strength of corroded ship structures. Firstly, the time-variant methodologies that consider only the mean structural element thickness loss due to corrosion degradation are identified. Corrosion degradation is regarded as the phenomenon that causes uneven thinning of specimens. This has been captured by various researchers as the loss of mechanical properties...

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  • Modelling of blood flow: from macro to microscales

    Publikacja

    The aim of this paper it to review various scale approaches to blood flow modelling. Blood motion may be described by three types of mathematical models according to the observed scales or resolutions, namely microscopic, mesoscopic and macroscopic description. The above approaches are discussed together with their advantages and disadvantages. Several results of mesoscopic simulations are presented.

  • Numerical Modelling of Structures with Uncertainties

    Publikacja

    The nature of environmental interactions, as well as large dimensions and complex structure of marine offshore objects, make designing, building and operation of these objects a great challenge. This is the reason why a vast majority of investment cases of this type include structural analysis, performed using scaled laboratory models and complemented by extended computer simulations. The present paper focuses on FEM modelling...

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  • Knowledge-Grid Modelling for Academic Purposes

    Publikacja

    - Rok 2016

    Nowadays, we face a huge amount of data and information sharing on the Web by different users worldwide. A multidimensional perspective in describing a university ontology seems to be very important for the modelling of higher education resources. This paper proposes a multi-dimensional knowledge model, designed to distribute and manage knowledge resources efficiently. We propose our model as the foundation of an advanced knowledge...

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  • The modelling method of discrete-continuous systems

    Publikacja

    The paper introduces a method of discrete-continuous systems modelling. In the proposed method a three-dimensional system is divided into finite elements in only two directions, with the third direction remaining continuous. The thus obtained discrete-continuous model is described by a set of partial differential equations. General difference equations of discrete system are obtained using the rigid finite element method. The limit...

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  • Modelling of heat transfer in supercritical pressure recuperators

    Publikacja

    - ENERGY - Rok 2020

    In the paper presented is analysis of convective flow heat transfer at supercritical pressure in channels of heat exchanger working in the thermodynamic cycle. The modelling is based on the division of the flow into three regions, namely the heavy fluid, a two phase flow consisting of the heavy and light fluids and finally the light fluid flow. Modelling is concentrated on the region of simultaneous flow of two fluids divided into...

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  • Business Process Modelling and Enterprise Improvement Analysis

    Publikacja

    The main trends in developing an approach and tools for business process modelling are discussed. Business Process Management (BPM) and BPM Notation (BPMN) are presented. Moreover, the possibilities of C2NIWA in a wide range of these tools running on a supercomputer are suggested. Firstly, the company development strategy can be planned . Secondly, quick and flexible changes of its processes can be modelled, analysed and implemented....

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  • ECONOMIC MODELLING

    Czasopisma

    ISSN: 0264-9993 , eISSN: 1873-6122

  • Numerical modelling of 3D printout using line (1D) elements

    Publikacja

    A proposition of some numerical modelling of the 3D printout is presented in the paper. The proposed model is composed of some 1D elements. The resulting numerical model of the infill consist of beam, spring and rigid elements. Obtained results confirm correctness of the proposed modelling method. Two methods of estimation of the spring parameters are proposed in the paper. In the first method, mechanical properties of the connecting...

  • Modelling of dielectric properties of BiNbO4-based microwave ceramics

    Publikacja

    In the present paper results of the studies devoted to computer simulations of dielectric response of electroceramics in a frequency domain as well as analysis of the experimental data are given. As an object of investigations BiNbO4-based microwave ceramics was taken. Simulations of the hypothetical impedance response of the ceramic system were performed under assumption of the brick-layer model. A strategy for analysis and modelling...

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  • Spatial Modelling in Environmental Analysis and Civil Engineering

    As can be seen, Spatial Modelling in Environmental Analysis and Civil Engineering applies to a multitude of applications. In an attempt to bring the topic closer to potential readers, the special issue referred to security methods, optimization of calculations, conducting measurements and empirical tests. Each article has made an original contribution to the development of practical science that can be replicated by researchers...

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  • Path Loss Modelling for Location Service Applications

    The aim of this paper is the path loss modelling for the radiolocation services in radio communication networks, particularly in cellular networks. The main results of the measurements obtained in the physical layer of the UMTS are introduced. A new method for the utilization of the multipath propagation phenomenon to improve the estimation of the distance between the MS (mobile station) and the BS (base station) is outlined. This...

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  • Modelling of the viscoelastic properties of the technical fabric VALMEX

    Publikacja

    - Rok 2016

    The analysis of the Burgers model used for the constitutive description of the technical fabric VALMEX vis-coelastic behavior is presented. It has revealed that the correctness of the identification depends strongly on the level of the immediate strain taken for calculations. Moreover, it has been proven that the Burgers model can be used for modelling of the viscoelastic properties of the polyester reinforced PVC coated VALMEX...

  • Modelling the context of use for Intranet portals design

    Publikacja

    - Rok 2007

    Intranet portals in contemporary enterprises affect the way how people work, communicate and build relationships within teams and organizations. Developing high usability in Intranet projects requires analysing context of use and including many additional organizational and cultural factors, normally not present in regular software projects. A modelling framework presented in this paper is useful for analysing context of use for...

  • Applying Generative Modelling Tools to Explore Architectural Forms

    The digital generative methods open up new areas for exploration of formal and tectonic features, accentuate form’s ability to emerge and perform. They allow for automatic generation of variations of solutions, and digital production of “difficult” components of architectural forms using CNC technology.The paper deals with contemporary architectural explorations of complex , curvilinear surfaces in the context of generative...

  • Modelling and computer animation of geodetic field work

    Publikacja

    - Rok 2014

    3D modelling of objects is a way of obtaining information, while the visualization of geospatial data is becoming a production task in the scope of surveying. Visualization of geospatial data provides effective tools for analysis information about the land surface, land cover, its features, properties etc. Computer animations, both 2D images and 3D are becoming additional, expected and clear form for presentation results of geodetic...

  • THE MODELLING OF ACCUMULATION AND DISSIPATION OF ENERGY IN MECHANICAL DRIVE SYSTEM

    Publikacja

    This paper presents a modelling of accumulation and dissipation energy in simple drive system. The simple drive system is presented by laboratory stand designed for calculate fatigue life of material for bending and rotation tests pieces. The laboratory stand was prepared to diagnosis of fatigue life of material by use energetic methods. This idea was submitted as utility model to Polish Patent Office. This laboratory stand gives...

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  • COMBUSTION THEORY AND MODELLING

    Czasopisma

    ISSN: 1364-7830 , eISSN: 1741-3559

  • ENVIRONMENTAL MODELLING & SOFTWARE

    Czasopisma

    ISSN: 1364-8152 , eISSN: 1873-6726

  • Journal of Modelling in Management

    Czasopisma

    ISSN: 1746-5664 , eISSN: 1746-5672

  • Journal of Choice Modelling

    Czasopisma

    ISSN: 1755-5345

  • Journal of Language Modelling

    Czasopisma

    ISSN: 2299-8470 , eISSN: 2299-856X