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Wyświetlanie 1-15 z 17
Tytuł:
Visible Human Projects - a step towards the virtual patient: models and simulations
Autorzy:
Król, Z.
Chlebiej, M.
Mikołajczak, P.
Hoffmann, K.-H.
Powiązania:
https://bibliotekanauki.pl/articles/333562.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
segmentacja
rejestracja
modele funkcyjne
symulacja biomechaniczna
wirtualne fantomy specyficzne dla pacjentów
segmentation
registration
Visible Human Project
functional models
biomechanical simulation
virtual patient-specific anatomical models
Opis:
This paper reports on our experiences using datasets from the Visible Human Project in different biomedical applications. Introduced 1994 by the US National Library of Medicine the digitized multimodal anatomical datasets of the Visible Man have challenged the worldwide scientific community. A significant response to this challenge from several interdisciplinary research teams has emerged as a new area of research. This area requires close interaction and collaboration among anatomists, radiologists, computer scientists, mathematicians, engineers and physicians. The digitized volumetric images of the human body have been applied not only for the computer-aided exploration of the human gross anatomy, but also as structural input for the therapy planning and simulation systems. The importance of such virtual patient model is becoming increasingly recognized in modern medicine. To effectively use these specific datasets a sophisticated framework consisting of image processing, computer graphics and mathematical modelling methods is required. In this work various aspects of the developed framework are presented and discussed. Some preliminary results of our biomedical simulations are presented.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 7; MIP51-58
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele wyceny ryzyka i jakość zarządzania korporacyjnego na rynku firm finansowych
Models of risk and quality testing of corporate management in the financial services market
Autorzy:
Turek, Marian
Powiązania:
https://bibliotekanauki.pl/articles/587426.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele procesów finansowych
Wybór portfela
Zarządzanie ryzykiem finansowym
Financial risk management
Models and simulations
Portfolio choice
Opis:
W firmach finansowych, gdzie istnieje świadomość nieodłączneego ryzyka związanego z marketingiem i obrotem produktami finansowymi (np. limity stóp procentowych), wdrażane są strategie zarządzania ryzykiem, które pozwalają im zrozumieć ograniczenia stosowanych dotychczas modeli finansowych. Celem artykułu jest prezentacja wyników analizy zależności pomiędzy ryzykiem finansowym, którego doświadczają firmy fianansowe na rynku, a stworzeniem efektywniejszego systemu zarządzania ryzykiem. Najnowocześniejsze firmy finansowe, stosujące wyrafinowane praktyki zarządzania ryzykiem, są w stanie dodawać etykiety ostrzegawcze, które służą uwidocznieniu poziomu ryzyka.
Financial services firms, who understand the risk inherent in the marketing and turnover of financial products (such as that associated with setting limits on interest rates), implement risk management strategies that enable them to understand the restrictions imposed by the financial models that have been used. The purpose of the article is to analyse the relationship between the financial risk hitherto experienced on the market and the creation of an effective system of risk management. The firms in the vanguard, those who have brought in sophisticated risk management practices, are well placed to control risk and introduce warning markers that serve to bring the risk level to light.
Źródło:
Studia Ekonomiczne; 2019, 378; 158-167
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deterministic models and stochastic simulations in multiple reaction models in systems biology
Autorzy:
Laroch, P.
Puszynski, K.
Polanski, A.
Powiązania:
https://bibliotekanauki.pl/articles/80910.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deterministic model
stochastic simulation
multiple reaction model
stochastic approach
modelling
biomolecular reaction
system biology
computational analysis
algorithm
living organism
biomolecule
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2011, 92, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Models and Computer Simulations of Aerial Spraying and Droplets Distribution in a Target Site
Autorzy:
Rowiński, Robert S.
Powiązania:
https://bibliotekanauki.pl/articles/36406214.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
agricultural aviation
aerial spraying
drift
Opis:
Mathematical models describing aerial spraying and the distribution of liquid droplets on a target were presented. Relationships based on “free models” with Gaussian distribution of droplet concentrations and “bound models” that account for the impact of disturbances in the velocity field behind agricultural aircraft were expanded, and the hybrid model too. The results of experimental studies were presented and compared with theoretical calculations. The “bound model” was found to be the most effective solution for describing the physical phenomena that accompany the aerial spraying process.
Źródło:
Transactions on Aerospace Research; 2019, 3 (256); 24-42
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Game Based Worldbuilding: Planning, Models, Simulations and Digital Twins
Autorzy:
Cureton, Paul
Coulton, Paul
Powiązania:
https://bibliotekanauki.pl/articles/41316225.pdf
Data publikacji:
2024
Wydawca:
Univerzita sv. Cyrila a Metoda. Fakulta masmediálnej komunikácie
Tematy:
city-buiding games
digital games
future scenarios
urban digital twins
urban models
Opis:
Urban planning has been simulated through various city-building games such as The Sumerian Game (1964), SimCity (1989), and Cities: Skylines (2015), amongst many others. Gaming technology has been utilized in 3D GIS, City Information Models (CIMs), and Urban Digital Twins (UDTs) to enhance public participation and engagement in the planning process. This article studies the overlap and ‘game-like’ qualities of these systems and presents an Urban Game Continuum. This interactive tool works in tandem with a taxonomy of city-building games and existing UDTs in order to assist with the design of future systems. A case study imported GeoData from Lancaster, UK, into a games platform. The continuum tool and case study offer new insights into opportunities for the utilisation of game design and gaming technology in urban planning and digital transformation. The article argues that the current use of gaming technology for real-world applications is one-directional and misses opportunities to include digital game design and research, such as mechanics, dynamics, flow, and public participatory world-building for future scenarios. By incorporating these elements, UDT systems could offer higher levels of citizen engagement.
Źródło:
Acta Ludologica; 2024, 7, 1; 18-36
2585-8599
Pojawia się w:
Acta Ludologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical B-H Saturation Magnetization Curve Models for SPICE, FEM and MoM Simulations
Autorzy:
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/384253.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
saturation
magnetization curve
perpendicular anisotropy
Mn-Zn ferrite
Finemet
Opis:
Recent development of SPICE, FEM and MoM software often requires the fast and reliable description of BH saturation magnetization curve. In spite of the fact that physical models of BH saturation curve are very sophisticated, for technical purposes, such curve may be modelled by simplified equations. Paper presents the quantitative assessment of the quality of four technical models of BH saturation magnetization curve performed for four modern magnetic materials: constructional corrosion resistant steel, Mn-Zn ferrite, amorphous alloy with perpendicular anisotropy as well as Finemet-type nanocrystalline magnetic material. Presented results confirm reliability of the model as well as indicate that high-speed calculation may be done using arctangent function.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 2; 3-7
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models and methods of optimization of waterway parameters
Autorzy:
Gucma, S.
Powiązania:
https://bibliotekanauki.pl/articles/320853.pdf
Data publikacji:
2000
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
drogi wodne
navigation
waterway
simulations
Opis:
The article presents two general models of optimisation of waterway parameters as well as a number of detailed simulated methods of optimisation. It discusses a model with four limitations of manoeuvring safety and a model with one limitation that is a navigational risk.
Źródło:
Annual of Navigation; 2000, 2; 25-36
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and simulation analysis of mine production in 3D environment
Autorzy:
Chęciński, S.
Witt, A.
Powiązania:
https://bibliotekanauki.pl/articles/89228.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
simulations
mine production
FlexSim
analysis of scenarios
3D models
Opis:
The article considers the problems posed by the application of 3D simulation analysis to the modeling of production processes in surface mining. The issues here focused on include the possibilities of creating the representations of mining exploitation elements in a three-dimensional environment as well as the description of the influence that spatial characteristics of surface mines has on simulation processes. The paper also discusses the sense for employing simulation techniques in the design of surface mining production processes and presents the results of analysis performed for a model production system. In conclusion the advantages and disadvantages of the described solutions are compared and the perspectives for their further development and popularization are described.
Źródło:
Mining Science; 2015, 22; 183-191
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulations and Tracer Studies as a Tool to Support Water Circulation Modeling in Breeding Reservoirs
Autorzy:
Zima, P.
Powiązania:
https://bibliotekanauki.pl/articles/241289.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
breeding reservoir hydraulics
water circulation
tracer study
mathematical modeling
kinematics models
Opis:
The article presents a proposal of a method for computer-aided design and analysis of breeding reservoirs in zoos and aquariums. The method applied involves the use of computer simulations of water circulation in breeding pools. A mathematical model of a pool was developed, and a tracer study was carried out. A simplified model of two-dimensional flow in the form of a biharmonic equation for the stream function (converted into components of the velocity vector) was adopted to describe the flow field. This equation, supplemented by appropriate boundary conditions, was solved numerically by the finite difference method. Next, a tracer migration equation was solved, which was a two-dimensional advection-dispersion equation describing the unsteady transport of a non-active, permanent solute. In order to obtain a proper solution, a tracer study (with rhodamine WT as a tracer) was conducted in situ. The results of these measurements were compared with numerical solutions obtained. The results of numerical simulations made it possible to reconstruct water circulation in the breading pool and to identify still water zones, where water circulation was impeded.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 3-4; 217--229
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ARFURIMA models: simulations of their properties and application
Autorzy:
Jibrin, Sanusi Alhaji
Rahman, Rosmanjawati Abdul
Powiązania:
https://bibliotekanauki.pl/articles/2107044.pdf
Data publikacji:
2022-06-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
interminable long memory
autocorrelation
fractional unit root integrated series
fractional unit root differencing
ARFURIMA model
Opis:
This article defines the Autoregressive Fractional Unit Root Integrated Moving Average (ARFURIMA) model for modelling ILM time series with fractional difference value in the interval of 1 < d < 2. The performance of the ARFURIMA model is examined through a Monte Carlo simulation. Also, some applications were presented using the energy series, bitcoin exchange rates and some financial data to compare the performance of the ARFURIMA and the Semiparametric Fractional Autoregressive Moving Average (SEMIFARMA) models. Findings showed that the ARFURIMA outperformed the SEMIFARMA model. The study’s conclusion provides another perspective in analysing large time series data for modelling and forecasting, and the findings suggest that the ARFURIMA model should be applied if the studied data show a type of ILM process with a degree of fractional difference in the interval of 1 < d < 2.
Źródło:
Statistics in Transition new series; 2022, 23, 2; 69-87
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Building and Validation of Numerical Models of the B-32 Type Armour-Piercing Projectiles
Autorzy:
Wiśniewski, A.
Żochowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/403885.pdf
Data publikacji:
2013
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanics
terminal ballistics
numerical simulations of penetration
penetration of steel
API projectile
Opis:
Process of building and the validation of the numerical models of the B-32 type armour-piercing incendiary (API) projectile is described in this article. Results of projectile compression tests (static and under high strain rates with the use of the modified Split Hopkinson Pressure Bar) are shown. On the basis of this, the values of the Johnson–Cook (J–C) strength model parameters for the projectile core material (N12e steel) were determined. This article presents results gained from simulations of the tests, in which the B-32 type projectile was modelled with the use of determined values of the J–C strength and failure models parameters. The process of the parameters values verification was described, in which the stress and strain obtained from samples in experiments and simulations were compared. Additional verification of the determined parameters values was comparison to the depth of penetration (DP) tests results of the Armox 500T plates fired with the 12.7 mm B-32 type projectile, obtained experimentally and in simulations. Small differences (< 5%) between stress and penetration depths obtained in the simulations and in the tests showed that the J–C parameter values were determined correctly.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2013, 4, 2 (12); 19-30
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compound-combination synchronization of chaos in identical and different orders chaotic systems
Autorzy:
Ojo, K. S.
Njah, A. N.
Olusola, O. I.
Powiązania:
https://bibliotekanauki.pl/articles/229175.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
control and applications of chaos
low- and high-dimensional chaos
numerical simulations of chaotic models
synchronization
coupled oscillators
Opis:
This paper proposes a new synchronization scheme called compound-combination synchronization. The scheme is investigated using six chaotic Josephson junctions evolving from different initial conditions based on the drive-response configuration via the active backstepping technique. The technique is applied to achieve compound-combination synchronization of: (i) six identical third order resistive-capacitive-inductive-shunted Josepshon junctions (RCLSJJs) (with three as drive and three as response systems); (ii) three third order RCLSJJs (as drive systems) and three second order resistive-capacitive-shunted Josepshon junctions (RCSJJs (as response systems). In each case, sufficient conditions for global asymptotic stability for compound-combination synchronization to any desired scaling factors are achieved. Numerical simulations are employed to verify the feasibility and effectiveness of the compound-combination synchronization scheme. The result shows that this scheme could be used to vary the junction signal to any desired level and also give a better insight into synchronization in biological systems wherein different organs of different dynamical structures and orders are involved. The scheme could also provide high security in information transmission due to the complexity of its dynamical formulation.
Źródło:
Archives of Control Sciences; 2015, 25, 4; 463-490
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics simulations of the electrodynamic railgun different constructions and their measurement verification
Autorzy:
Piekielny, Paweł
Tomczuk, Bronisław
Waindok, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/27309948.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
3D field analysis
analysis of transients
analytical models
electrodynamic accelerator
experimental verification
field-circuit modeling
projectile velocity
Opis:
Dynamic characteristics for three types of railgun constructions were simulated and measured in this work. The simplest construction is the iron-less (IL) railgun, while the two other ones (IC and ICPM) have an iron-core. The iron-core permanent magnet (ICPM) railgun additionally has permanent magnets. To compare their characteristics, similar dimensions of the rails and iron cores were adopted, and the same power supply system was used. Numerical magnetic field analyses and our analytical models have been used to determine the electromagnetic parameters. They were verified experimentally. The transient states of the railguns were studied with our field-circuit mathematical model, and their results were also verified by experiments.
Źródło:
Archives of Electrical Engineering; 2023, 72, 4; 951--969
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations of fracture in concrete elements using continuous and discontinuous models
Symulacje zarysowania w elementach betonowych z zastosowaniem podejścia ciągłego i nieciągłego
Autorzy:
Bobiński, J.
Tejchman, J.
Powiązania:
https://bibliotekanauki.pl/articles/368938.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
beton
nielokalność
plastyczność
kontynualna mechanika uszkodzeń
XFEM
concrete
non-locality
plasticity
damage mechanics
Opis:
The paper presents results of numerical simulations of fracture in concrete using two different approaches. First, fracture was modelled in a smeared way by an elasto-plastic and a damage continuum model. In elasto-plasticity, a Rankine criterion was used. The degradation of the stiffness in the damage model was described as a scalar variable of an equivalent strain measure. To ensure mesh-independent results, a non-local theory was used. Second, fracture was simulated as discontinuities with the aid of cohesive elements and Extended Finite Element Method (XFEM). The experimental benchmark test for concrete by Nooru-Mohamed under mixed mode conditions was modelled. The obtained numerical results were compared with the corresponding experimental ones.
W pracy przedstawiono wyniki symulacji numerycznych MES pękania w betonie z wykorzystaniem dwóch różnych podejść. Po pierwsze, zastosowano ciągły (przesmarowany) opis rys w teorii plastyczności oraz model degradacji modułu sprężystości z różnymi opisami odkształcenia zastępczego w ramach kontynualnej mechaniki uszkodzeń. Oba prawa rozszerzono o długość charakterystyczną mikrostruktury w ramach teorii nielokalnej w celu uzyskania wyników niezależnych od siatki MES. Po drugie, jako alternatywę do symulacji propagacji rys zastosowano nieciągły opis pola przemieszczeń, wykorzystując elementy kohezyjne oraz rozszerzoną metodę elementów skończonych XFEM. Przeprowadzono symulacje numeryczne testu Nooru-Mohamada z jednoczesnym rozciąganiem i ścinaniem betonu. Uzyskane wyniki numeryczne porównano z wynikami doświadczalnymi.
Źródło:
Mechanics and Control; 2011, 30, 4; 183-193
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacje i obliczenia komputerowe modeli wirtualnych typoszeregu wałów uprawowych
Simulations and analysis of virtual computer models in application to series of types of agricultural rollers
Autorzy:
Rutkowski, J.
Szczepaniak, J.
Powiązania:
https://bibliotekanauki.pl/articles/337178.pdf
Data publikacji:
2005
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
wał
wał uprawowy
typoszereg
symulacja komputerowa
model wirtualny
agricultural rollers
virtual computer model
computer simulation
Opis:
W artykule zaprezentowano sposób przeprowadzenia analizy wytrzymałościowej i dynamicznej konstrukcji typoszeregu wałów uprawowych. Zaprezentowano także w postaci graficznej wybrane formy przedstawiania wyników symulacji: mapy naprężeń, rozkład sił, wykresy itp. W artykule zostało obszernie wyjaśnione praktyczne podejście do tego typu obliczeń, ze zwróceniem szczególnej uwagi na możliwości skrócenia ich czasu i kosztów.
In the paper presented is the method of strength and dynamic analysis of agricultural rollers. Presented are there also the selected forms of showing the simulation results, that is stresses, forces displacements etc. The practical method of carrying out the computer simulations is as well shown. The descriptions of these methods are extensive enough to show the aspects of costs and time reductions when carrying out these types of analyses.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2005, 50, 1; 5-9
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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