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Tytuł:
Ocena wpływu zmiennych objaśniających na zmienną zależną w metodzie rzutowania PPR
Determining the Influence of Predictor Variables on the Response Variable in the PPR Models
Autorzy:
Trzęsiok, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/593190.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Mathematical models
Opis:
Projection Pursuit Regression (PPR) was introduced by J. Friedman and W. Stuetzle in 1981. It is one of the nonparametric regression methods. The benchmark studies show very often the superiority of PPR models over other nonparametric or classical regression models in terms of the test error. PPR produces a "black-box" prediction machine and it suffers from the lack of interpretation. Thus it seems to be an important issue to find the method for evaluating the influence of the predictor variables on the response. We present the procedure that might be used to examine the strength of the influence of every predictor variable on the response variable in Projection Pursuit Regression models.
Źródło:
Studia Ekonomiczne; 2013, 132; 104-114
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczenie okresu równowagi i stabilizacji długookresowej
Determination of the Period of Long-Term Equilibrium and Stability
Autorzy:
Janiga-Ćmiel, Anna
Powiązania:
https://bibliotekanauki.pl/articles/590057.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Mathematical models
Opis:
The study examines the development of the Polish economy as well as the economies of selected European Union countries in the period from 1949 to 2006. Much space is devoted to a comparative analysis of the development economies in the countries concerned. Based on statistical data appropriate synthetic variables were set. Much space is devoted to the theory of the Johansen's method, to present the dependencies occurring in the dynamics of economic development in subsequent subperiods. The method allows for a comparative assessment of the dynamics of time series. The methods are adopted to examine the level of economic development, to determine the period of long-term equilibrium and stability.
Źródło:
Studia Ekonomiczne; 2013, 132; 35-44
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podpisy niezaprzeczalne - podpisy z dodatkową funkcjonalnością
Undeniable Signatures - Signatures with Additional Functionality
Autorzy:
Pośpiech, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/590990.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Mathematical models
Opis:
Today, the role of digital signatures becoming more and more significant. The signature provides authentication and integrity of a message but quite often other features like additional functionality is required from the signature. Because of that the algorithms used in ordinary signing are not sufficient, they need to be special algorithms with some additional characteristics. Undeniable signatures are a form of digital signature that have two distinctive features: the verification process is interactive (the signatures cannot be verified without signer's cooperation), a disavowal protocol allows to determine whether a given signature is a forgery. These signatures can be used, for example, to protect a software against unauthorized persons. The safety of these signatures is guaranteed by techniques of modern cryptography which is based on advanced mathematical tools and computer technology. The purpose of the article is to present selected schemes (protocols) of undeniable signatures (based on discrete log systems) such as Chaum-van Antwerpen protocol, Chaum-van Antwerpen protocol protecting against disavowal and a convertible undeniable signature protocol. Main definitions and theorems are presented and all described protocols are illustrated with examples.
Źródło:
Studia Ekonomiczne; 2013, 132; 67-79
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ redukcji poziomu szumu losowego metodą najbliższych sąsiadów na wartość największego wykładnika Lapunowa
Effect of Reduction of Random Noise by Method of the Nearest Neighbors on the Value of the Largest Lyapunov Exponent
Autorzy:
Zeug, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/592070.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Mathematical models
Opis:
Since the presence of noise in the data can significantly affect the characteristics of dynamic systems, the aim of the article will be to evaluate effect of reduction of random noise by method of the nearest neighbors on the value of the largest Lyapunov exponent. The test will be conducted on the basis of the economic time series, which consist of closing prices of companies listed on the Warsaw Stock Exchange and the daily exchange rates.
Źródło:
Studia Ekonomiczne; 2013, 132; 160-168
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of mathematical model for the autonomous gliding delivery system
Autorzy:
Loroch, L.
Sibilski, K.
Żyluk, A.
Powiązania:
https://bibliotekanauki.pl/articles/235504.pdf
Data publikacji:
2006
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
modele matematyczne
mathematical models
Opis:
For parafoil and payload aircraft, control is affected by changing the length of several rigging lines connected to the outboard side and rear of the parafoil leading to complex changes in the shape and orientation of the lifting surface. Flight mechanics of parafoil and payload aircraft most often employ a 6 or 9 DOF representation with the canopy modeled as a rigid body during flight. The effect of control inputs usually is idealized by the deflection of parafoil brakes on the left and right side of the parafoil. This work focused on description of a 9 DOF parafoil and payload aircraft simulation model.
Źródło:
Problemy Techniki Uzbrojenia; 2006, R. 35, z. 97; 149-162
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie metod rozmytego i probabilistycznego modelowania zjawiska na przykładzie oceny ryzyka usług informatycznych
Comparison of Fuzzy and Probabilistic Modeling with Using it Services Risk Evaluation Example
Autorzy:
Wachstiel, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/593486.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Ryzyko
Mathematical models
Risk
Opis:
In the article, two approaches to IT services risk assessment has been described and compared. The first one is based on fuzzy methods in the opposite to the second one which uses probability. The following hypothesis has been proposed and proved by showing a practical example: fuzzy modeling is more effective than probabilistic in IT services risk assessment.
Źródło:
Studia Ekonomiczne; 2013, 132; 127-135
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar funkcji turystycznej obszarów za pomocą wskaźników funkcji turystycznej na przykładzie obszarów państw europejskich
The Measurement of Tourism Function of Areas Using Indicators of the Tourism Function on the Example of Areas of European Countries
Autorzy:
Szromek, Adam R.
Powiązania:
https://bibliotekanauki.pl/articles/588030.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Turystyka
Mathematical models
Tourism
Opis:
This paper presents the most popular indicators of the tourist function , and supplements them with modern synthetic metrics. The subject of the application of these indicators is to measure of the tourism function in 31 European countries and making their classification according to the values of measurement used. Unusual problem of engaging research area in the country and not in the local formulation allows for a much more clear showing weaknesses of individual metrics that recognize the problem described. A fragmented approach to the tourism function, prompts to use of synthetic measures which prove to be more useful in classifying particular areas.
Źródło:
Studia Ekonomiczne; 2013, 132; 91-103
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The models for the comparison of roundness profiles
Autorzy:
Tichá, S.
Adamczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/384343.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
roundness
correlation coefficients
mathematical models
comparison
Opis:
Roundness is one of the mostly frequently observed geometrical deviations. A profile of a machine part consisting of simple harmonic courses or their sums depends on a number of factors. Modeling of geometrical deviations requires applying the Fourier to extend each periodical function into an infinite series of harmonic components. Using of harmonic analysis we are able to determine the values of amplitudes of single components and their phase shifts. These parameters can be used for example for comparison of roundness profiles by means of correlation coefficients. The obtained correlation coefficients are concrete parameters, on the basis of which it is possible to determine the degree of conformity and unity between the compared profiles. The comparison of evaluated roundness profiles can be represented as mathematical statistical models. In these models is detected sequence of single steps, which are necessary for determination of required correlation coefficients [1, 2] .
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 27-29
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Investigation and Multi-Response Optimization in Turning of Incoloy 800H Superalloy
Autorzy:
Palanisamy, A.
Selvaraj, T.
Sivasankaran, S.
Powiązania:
https://bibliotekanauki.pl/articles/356237.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
superalloy
microstructure
Taguchi-Grey approach
mathematical models
Opis:
This research work is focused on examining the turning behavior of Incoloy 800H superalloy by varying important cutting parameters. Incoloy 800H is an Iron-Nickel-Chromium based superalloy; it can withstand high temperature (810°C), high oxidization and corrosion resistance. But, it is difficult to turn in conventional machines and hence the present work was carried out and investigated. Experiments were conducted based on the standard L27 orthogonal array using uncoated tungsten inserts. The cutting force components, namely, feed force (Fx), thrust force (Fy) and cutting force (Fz); surface roughness (Ra) and specific cutting pressure (SCPR) were measured as responses and optimized using Taguchi-Grey approach. The main effects plots and analysis of mean (ANOM) were performed to check the effect of turning parameters and their significance on responses of cutting forces in all the direction (FX, FY, FZ), the surface roughness (Ra) and specific cutting pressure (SCPR). The tool wear and machined surfaces were also investigated using white light interferometer and SEM.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1683-1691
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Timed models of security protocols including delays in the network
Autorzy:
Szymoniak, S.
Kurkowski, M.
Piątkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/122609.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
computer science
mathematical models
informatyka
modele matematyczne
Opis:
A very important part of the network and computer systems is to ensure an appropriate level of information transmission security. Security is based primarily on properly selected communication in security protocol. Unfortunately, the time-dependent protocols are vulnerable to attacks; therefore there is a need to verify these protocols. For verification purposes, protocols can be modeled using timed automata. During the modeling and verification of the protocols, one should also keep in mind delays in the network. So far, delays in the network were not modeled.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 127-139
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of roller bearing cages
Autorzy:
Kohar, R.
Krzysiak, Z.
Lukac, M.
Brumercik, F.
Powiązania:
https://bibliotekanauki.pl/articles/132167.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
computer simulation
dynamic analysis
mathematical models
roller bearings
Opis:
The aim of this paper is to detail the creation of a roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
Źródło:
Advanced Technologies in Mechanics; 2016, 3, no. 2 (7); 2-11
2392-0327
Pojawia się w:
Advanced Technologies in Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspekt sytuacji status quo we wspomaganiu wielokryterialnego wyboru bazującego na teorii gier
An Aspect of Status Quo Situation in Multiple Criteria Choice Support Basing on Game Theory
Autorzy:
Wolny, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/593101.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Teoria gier
Game theory
Mathematical models
Opis:
In this paper multiple criteria decision problem is considered as a noncooperative game. Each criterion is assigned with a player and every feasible (and effective) solution with a pure strategy. Players payoffs result from assessments of solutions in game state where every player chooses the same strategy-solution. In the analysed game status quo situation is a state in which at least one player-criterion chooses different strategy. The problem of payoff definition in such situation is considered in the paper. A proposal is to state pessimistic payoffs in status quo situations as minimal value of payoffs in situations related with considered solutions of multiple criteria problem (exactly multiple criteria choice problem). The proposal is compared with a deterministic model and solution and based on example from Madani and Lund's (2011) work.
Źródło:
Studia Ekonomiczne; 2013, 132; 136-147
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wspomaganie kooperacji z wykorzystaniem teorii gier i analizy wielokryterialnej
Cooperation Support Based on Game Theory and Multicriterial Analysis
Autorzy:
Wolny, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/590310.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Teoria gier
Mathematical models
Game theory
Opis:
In the paper an idea of cooperation supporting method based on game theory and multicriterial analysis. Because of taking into consideration a cooperation game with empty core an idea of supporting is based on Bondareva's and Shapley's conditions for non-emptyness of the core. There is defined a minimal value which should be added to payoff of great coalition. The minimal value should be profitable. Also an idea of multicriterial support for establish winnings for the players in cooperative game is presented. The problem is considered in case when ad hoc arrangement is irrational in meaning that the allocation of winnings is outside the core of the game. The proposal is based on concept of goal programming and reference point method. The proposed ideas are shown on example of cooperation problem of the three autonomous departments in enterprise.
Źródło:
Studia Ekonomiczne; 2013, 132; 148-159
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dwumianowy model wyceny opcji w warunkach rozmytych informacji
The Binomial Option Pricing Model in Case of a Fuzzy Information
Autorzy:
Przybycin, Zygmunt
Powiązania:
https://bibliotekanauki.pl/articles/592581.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele matematyczne
Wycena opcji
Mathematical models
Options pricing
Opis:
In the article presents the modification of the binomial model of European option pricing. Adopted namely, that it is appropriate to the weakening of the assumptions about the mechanism of price formation on the underlying instrument. In the proposed option pricing model, mechanism of option pricing formation is described in terms of fuzzy numbers. In the article, also posted selected messages from the scope of fuzzy numbers and options.
Źródło:
Studia Ekonomiczne; 2013, 132; 80-90
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozwiązanie zagadnienia dynamiki grubościennej kulistej osłony balistycznej obciążonej udarowo ciśnieniem wewnętrznym z uwzględnieniem przemieszczenia powierzchni przyłożenia warunków brzegowych
Solution of the problem of a spherical thick-walled ballistic casing dynamics surge-loaded by the internal pressure with respect to movement of boundary conditions application surfaces
Autorzy:
Włodarczyk, E.
Zielenkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/236178.pdf
Data publikacji:
2009
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
pola dynamiczne
modele matematyczne
dynamic fields
mathematical models
Opis:
Zbadano dynamiczne pola: przemieszczeń, odkształceń i naprężeń w kulistej grubościennej osłonie balistycznej, obciążonej wewnętrznie ciśnieniem produktów detonacji materiału wybuchowego. Założono, że materiał osłony jest jednorodny izotropowy i sprężyście nieściśliwy. Okazuje się, że taka osłona pod wymienionym obciążeniem drga radialnie z określoną częstością kołową, podobnie jak układ mechaniczny o jednym stopniu swobody. Rozpatrzono dwa modele matematyczne badanego zagadnienia: liniowy, w którym warunki brzegowe lokalizowano na początkowym położeniu powierzchni granicznych osłony (współrzędne Lagrange'a) i nieliniowy, uwzględniający ruch granicznych powierzchni osłony w warunkach brzegowych (współrzędne Eulera). Dla modelu liniowego uzyskano analityczne zamknięte rozwiązanie problemu. W przypadku bardzo małych odkształceń sprężystych, mniejszych od 1% otrzymuje się z niego wyniki zbieżne z rozwiązaniem nieliniowym. Tylko w tym przedziale odkształceń (εφ < 0,01) można go stosować w inżynierskich obliczeniach. Dla większych odkształceń błędy wynikające z linearyzacji problemu są rzędu kilkunastu i więcej procent. Linearyzacja zagadnienia zniekształca ilościowy i jakościowy obraz dynamicznych parametrów osłony.
Dynamic fields of: displacements, strains and stresses m a spherical thick-walled ballistic casing loaded internally by the pressure of high explosive detonation products were studied. The casing material is assumed to be homogenous, isotropic and elastically incompressible. It turns out that this kind of casing loaded as mentioned above oscillates radially with determinate angular frequency, likewise the mechanical system of one degree of freedom. Two mathematical models of studied problem were considered: the linear model, in which boundary conditions were applied to the initial position of limiting surfaces of casing (Lagrangian coordinates), and the nonlinear model, taking into account the movement of casing limiting surfaces in boundary conditions (Eulerian coordinates). For the linear model the analytic closed solution to the problem were obtained. In case of very small elastic strains, less than 1%, the results obtained for this model arę convergent to the nonlinear solution. Only in this range of strains (εφ < 0,01) it can be used in engineering calculations. For larger strains the errors resulting from the linearization of the problem are of the order of dozen and more per cent. The linearization of the problem distorts quantitative and qualitative view of casing dynamic parameters.
Źródło:
Problemy Techniki Uzbrojenia; 2009, R. 38, z. 109; 167-182
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference melt model
Autorzy:
Kazhikenova, Saule Sh.
Shaltakov, Sagyndyk N.
Nussupbekov, Bekbolat R.
Powiązania:
https://bibliotekanauki.pl/articles/1845514.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Navier-Stokes equations
hydrodynamic
approximations
mathematical models
melt
Opis:
The basic objective of the research is to construct a difference model of the melt motion. The existence of a solution to the problem is proven in the paper. It is also proven the convergence of the difference problem solution to the original problem solution of the melt motion. The Rothe method is implemented to study the Navier-Stokes equations, which provides the study of the boundary value problems correctness for a viscous incompressible flow both numerically and analytically.
Źródło:
Archives of Control Sciences; 2021, 31, 3; 607-627
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference melt model
Autorzy:
Kazhikenova, Saule Sh.
Shaltakov, Sagyndyk N.
Nussupbekov, Bekbolat R.
Powiązania:
https://bibliotekanauki.pl/articles/1845525.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Navier-Stokes equations
hydrodynamic
approximations
mathematical models
melt
Opis:
The basic objective of the research is to construct a difference model of the melt motion. The existence of a solution to the problem is proven in the paper. It is also proven the convergence of the difference problem solution to the original problem solution of the melt motion. The Rothe method is implemented to study the Navier-Stokes equations, which provides the study of the boundary value problems correctness for a viscous incompressible flow both numerically and analytically.
Źródło:
Archives of Control Sciences; 2021, 31, 3; 607-627
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of reaction gases or exhaust using an online process mass spectrometer
Autorzy:
Wei, Fu-Qiang
Huang, Ze-Jian
Jian, You
Dai, Xin-Hua
Fang, Xiang
Jin, Shang-Zhong
Powiązania:
https://bibliotekanauki.pl/articles/27311738.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
online quantitative analysis
mass spectrometers
mathematical models
monitoring
Opis:
Online quantitative analysis of reaction gases or exhaust in industrial production is of great significance to improve the production capacity and process. A novel method is developed for the online quantitative analysis of reaction gases or exhaust using quantitative mathematical models combined with the linear regression algorithm of machine learning. After accurately estimating the component gases and their contents in the reaction gases or exhaust, a ratio matrix is constructed to separate the relevant overlapping peaks. The ratio and calibration standard gases are detected, filtered, normalized, and linearly regressed with an online process mass spectrometer to correct the ratio matrices and obtain the relative sensitivity matrices. A quantitative mathematical model can be established to obtain the content of each component of the reaction gases or exhaust in real time. The maximum quantification error and relative standard deviation of the method are within 0.3% and 1%, after online quantification of the representative yeast fermenter tail gas.
Źródło:
Metrology and Measurement Systems; 2023, 30, 2; 337--351
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
M/t “Baltic Carrier” accident. The reconstruction of oil spill with PISCES II simulator application
Autorzy:
Łazuga, K.
Gucma, L.
Perkovic, M.
Powiązania:
https://bibliotekanauki.pl/articles/359813.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
oil spill
accident
PISCES II simulator
safety
mathematical models
Opis:
This paper presents reconstruction of the oil spill that occurred as result of an m/t “Baltic Carrier” accident. This reconstruction was carried out with use PISCES II simulator. The result of several simulations could be the step to usability and validation of PISCESS II simulator and as a guideline for setting up this kind of simulations.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 110-115
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The unique solvability of stationary and non-stationary incompressible melt models in the case of their linearization
Autorzy:
Kazhikenova, Saule Sh.
Powiązania:
https://bibliotekanauki.pl/articles/1409389.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Navier-Stockes equations
hydrodynamic
approximations
mathematical models
incompressible melt
Opis:
The article presents ε-approximation of hydrodynamics equations’ stationary model along with the proof of a theorem about existence of a hydrodynamics equations’ strongly generalized solution. It was proved by a theorem on the existence of uniqueness of the hydrodynamics equations’ temperature model’s solution, taking into account energy dissipation. There was implemented the Galerkin method to study the Navier-Stokes equations, which provides the study of the boundary value problems correctness for an incompressible viscous flow both numerically and analytically. Approximations of stationary and non-stationary models of the hydrodynamics equations were constructed by a system of Cauchy-Kovalevsky equations with a small parameter ε. There was developed an algorithm for numerical modelling of the Navier-Stokes equations by the finite difference method.
Źródło:
Archives of Control Sciences; 2021, 31, 2; 307-332
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical and graphical modelling of aerobatic flight trajectories
Autorzy:
Linka, A.
Wroblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/245876.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
mathematical models
flight trajectory
aerobatics
flight safety
glider aerobatics
Opis:
The article presents the current state of knowledge related to mathematical and graphical modelling of aircraft trajectories, particularly those of aerobatic flights. The first part of the article is an introduction to the subject of training and aerobatic flight. In the second chapter of this work, the authors describe the basic definitions related to mathematical modelling, rules for glider aerobatics (rules for the pilots and for the judges) and specification of navigation software, which is using during competitions. In the further part of the article the authors present example possibilities of application of the mathematical modelling tools in General Aviation and describe the possibilities of implementing the obtained models in selected navigation and tracking systems. In the same part of the article there is a description of the AeroSafetyShow Demonstrator PL – an intelligent system of flights supervision and safety (ASSD+PL), which will be using to compare the real flights trajectory and the models build trough the mathematical software. ASSD+PL in also only tracking system using by the judges at glider aerobatic World Championships. The aim of this article is to validate the applicability of the system comparing to the actual aircraft trajectory with the models referred to as ‘ideal’ for aerobatic purposes.
Źródło:
Journal of KONES; 2017, 24, 3; 181-187
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analizy epidemiologiczne w środowisku MATLAB/Octave
Epidemiological analysis in MATLAB/Octave
Autorzy:
Bartłomiejczyk, Agnieszka
Wata, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/267031.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
epidemiologia
modele matematyczne
symulacje numeryczne
epidemiology
mathematical models
numerical simulations
Opis:
W artykule skonstruowano proste modele matematyczne rozprzestrzeniania się chorób zakaźnych oparte na równaniach różniczkowych oraz automatach komórkowych. Na przykładzie modeli SIS i SIR zilustrowano praktyczne zastosowanie pojęć matematycznych nauczanych w toku studiów. Za pomocą symulacji komputerowych, do których użyto pakietów matematycznych MATLAB i Octave, uzyskano wizualizacje tempa rozwoju danej choroby oraz zasięgu epidemii. Ponadto przedstawiono informacje o zastosowaniu e-technologii w kształceniu studentów.
Epidemiology is a branch of medicine that studies the causes, development and spread of infectious diseases, as well as other large-scale diseases in human societies. Information about infectious diseases helps to control the health problem of the society and enables research of the outbreak of an epidemic. In our article, we construct simple mathematical models of the spread of infections: the model of a disease with no immunity against re-infection (SIS model) and the model including such an effect (SIR model). Moreover, we present numerical simulations in MATLAB and Octave, which illustrate the rate and extent of disease epidemics. In addition, information on the use of e-technologies in the education of students is presented.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2019, 65; 11-16
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matematyczne modelowanie kształtu korzenia pietruszki
Mathematical modeling of the shape of parsley root
Autorzy:
Mieszkalski, L.
Powiązania:
https://bibliotekanauki.pl/articles/227815.pdf
Data publikacji:
2013
Wydawca:
Wyższa Szkoła Menedżerska w Warszawie
Tematy:
korzenie pietruszki
kształt
modele matematyczne
parsley roots
shape
mathematical models
Opis:
W artykule przedstawiono metody matematycznego modelowania kształtu korzeni pietruszki. Zastosowano równania parametryczne, krzywe przestrzenne i krzywe Béziera. Stwierdzono, że proponowane modele mogą reprezentować kształt korzeni pietruszki podczas symulacji komputerowych procesu obróbki.
This paper presents a mathematical method of modeling the shape of parsley roots. Equations used parametric curves, spatial and Bézier curves. It was found that the proposed models can represent the shape of parsley roots during the machining process simulations.
Źródło:
Postępy Techniki Przetwórstwa Spożywczego; 2013, 1; 45-52
0867-793X
2719-3691
Pojawia się w:
Postępy Techniki Przetwórstwa Spożywczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical-information modeling of the operation of energy storages used in electric vehicles
Autorzy:
Bednarek, K.
Kasprzyk, L.
Hłasko, E.
Powiązania:
https://bibliotekanauki.pl/articles/97616.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
energy storages
mathematical models
battery discharge simulations
mobile object power supply
Opis:
The paper deals with the issues related to correctness of electric energy management – mainly in terms of the proper use of energy storages applied in mobile objects such as electric vehicles. Particular attention has been paid to mathematical models of lead-acid batteries, lithium-ion batteries and supercapacitors. While using the mathematical model of the lead-acid battery, the simulation of the process of its discharge was conducted using the MATLAB software. Characteristics of useful parameters of a model lead-acid battery obtained as a result of the conducted simulations were presented. Verification of the correctness of functioning of the created calculation model was carried by comparing the DC load characteristics of two specific batteries which were obtained as a result of conducted computer simulations, with characteristics determined on the basis of manufacturer’s data sheets received as a result of performance of physical tests. As an additional element verifying the correctness of the functioning of the simulations, the characteristics of battery discharge was determined on the basis of the result of calculations which were performed in accordance with the normative definition of electric capacity of the battery.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 485-497
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanizmy śmierci od komórki do całego organizmu
Mechanisms of cell death from cell to whole organism
Autorzy:
Ciesielska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/691931.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
apoptosis, mathematical models in biology, cell death, homeostasis, predator–prey model
Opis:
In vitro studies are alternative for in vivo studies carried on living organisms. They involve cell populations for both normal and cancer cells. The processes inside cells might be base for defining whole body processes. Starting with fundamental unit of every living organism which is cell, we can distinguish two main types of cell death – apoptosis and necrosis. Human organism is built from 1013–1014 cells of 300 different cell types. During cell division new cells are created and their number is strictly controlled in programmed cell death – apoptosis. Mainly old or damaged cells commit suicide and are removed from organism. This is natural phenomenon and every change in mechanisms of proliferation or apoptosis cause changes and damage in whole organism. Homeostasis in organism depends on correct action of death and survival system. The patterns of equilibrium in nature relies on similar regulation profiles, in which it is similar to death of singular organisms in population or species. It implicates death as natural phenomenon maintaining balance in the world.
Źródło:
Zoophilologica. Polish Journal of Animal Studies; 2019, 5
2719-2687
2451-3849
Pojawia się w:
Zoophilologica. Polish Journal of Animal Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 115

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