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Tytuł:
On Mathematical Modelling in Biology and Medicine
Autorzy:
Skrzypczak, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/748595.pdf
Data publikacji:
1985
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
General biology
Theory of mathematical modeling
Opis:
.
A comparison of input ideas and data as well as goals of mathematical models used in physics and biology is briefly discussed. The models used in biology and medicine are divided into „static" and „dynamical" ones and typical schemes of their construction and analysis are given. The main part of the paper concerns dynamical models describing the time evolution of modelled systems in the form of differential eąuations, Some examples are treated in a more detailed way with a stress on their analysis by means of the qualitative theory of differential eąuations. The quantitative (in particular, numerical) and the qualitative approaches to the model analysis in biology are discussed and compared. Arguments in favour of the qualitative approach in many biological problems are given.
Źródło:
Mathematica Applicanda; 1985, 13, 26
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peirce, Sebeok, and the Semiotic Reformation on Contemporary Communications
Autorzy:
Magsino, Maria Asuncion L.
Powiązania:
https://bibliotekanauki.pl/articles/507250.pdf
Data publikacji:
2018-03-30
Wydawca:
International Étienne Gilson Society
Tematy:
language
communication
sign
signification
semiosis
Charles S. Peirce
Thomas A. Sebeok
modeling system
John Deely
postmodernism
suprasubjective nature of sign
modeling theory
truth
icon of reality
Opis:
Language in a broad sense becomes imperative for communication to ensue. Language considered as a system of signs and signification is achieved through a process involving sign relations, e.g. semiosis. Charles S. Peirce’s Theory of Signs can provide a basic framework for the elucidation of the intelligibility of signs. Furthermore, the ability for generating sign processes in an organized manner is determined by what Thomas A. Sebeok designates as an organism’s modeling capacity. Modeling capacities range from primitive to complex, thus generating three orders of language corresponding to language as a Primary Modeling System (PMS), a Secondary Modeling System (SMS) and a Tertiary Modeling System (TMS). This Peirce-Sebeok framework for communication, which John Deely places as “postmodern,” is premised upon what he designates as the suprasubjective nature of sign relations and their equally suprasubjective function. Thus, Sebeok’s Modeling Theory together with Peirce’s doctrine on the nature and behavior of signs can be used to direct the generation as well as the interpretation of language systems in accordance with the ultimate norm of communication, that is, to reflect truth as an icon of reality.
Źródło:
Studia Gilsoniana; 2018, 7, 1; 11-31
2300-0066
Pojawia się w:
Studia Gilsoniana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uplift Modeling in Direct Marketing
Autorzy:
Rzepakowski, P.
Jaroszewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/309211.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
decision trees
information theory
marketing tools
uplift modeling
Opis:
Marketing campaigns directed to randomly selected customers often generate huge costs and a weak response. Moreover, such campaigns tend to unnecessarily annoy customers and make them less likely to answer to future communications. Precise targeting of marketing actions can potentially results in a greater return on investment. Usually, response models are used to select good targets. They aim at achieving high prediction accuracy for the probability of purchase based on a sample of customers, to whom a pilot campaign has been sent. However, to separate the impact of the action from other stimuli and spontaneous purchases we should model not the response probabilities themselves, but instead, the change in those probabilities caused by the action. The problem of predicting this change is known as uplift modeling, differential response analysis, or true lift modeling. In this work, tree-based classifiers designed for uplift modeling are applied to real marketing data and compared with traditional response models, and other uplift modeling techniques described in literature. The experiments show that the proposed approaches outperform existing uplift modeling algorithms and demonstrate significant advantages of uplift modeling over traditional, response based targeting.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 2; 43-50
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extended problem to Bertrands paradox
Autorzy:
Ardakani, Mostafa
Wulff, Shaun
Powiązania:
https://bibliotekanauki.pl/articles/729808.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
probability space
probability theory
problem modeling
random chords
Opis:
Bertrand's paradox is a longstanding problem within the classical interpretation of probability theory. The solutions 1/2, 1/3, and 1/4 were proposed using three different approaches to model the problem. In this article, an extended problem, of which Bertrand's paradox is a special case, is proposed and solved. For the special case, it is shown that the corresponding solution is 1/3. Moreover, the reasons of inconsistency are discussed and a proper modeling approach is determined by careful examination of the probability space.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 23-34
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a web application supporting gym management in terms of control and systems theory
Autorzy:
Tchórzewski, Jerzy
Nabiałek, Wojciech
Księżopolski, Artur
Powiązania:
https://bibliotekanauki.pl/articles/27323576.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
gym management
identity theory
MATLAB
Simulink environment
modeling
simulations
web systems
Opis:
An analysis of the web application supporting the management of the gym was carried out, which was designed in terms of the theory of control and systems. The obtained results of measurements of input and output quantities of selected subsystems were used to carry out the identification, as a result of which models of web application subsystems were obtained. On the basis of the obtained subsystem models, appropriate models were then designed in Simulink for the purposes of simulation and comparative studies of the behavior of subsystem models in relation to real systems that are web applications, including an appropriate analysis of the web application system model was carried out under the name of the gym on its selected subsystems, including in particular the subsystem called Generating a diet. In addition, testing and simulation studies were carried out to check the correct functioning of the web application management system model and the introduction of appropriate changes to the model was proposed, and the obtained research results were discussed, indicating the high accuracy of the obtained web application models.
Źródło:
Studia Informatica : systems and information technology; 2023, 1(28); 47--68
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Ineffectiveness Arising in “Investor-government” Relations
Autorzy:
Sokolovskyi, Dmytro B.
Sokolovska, Olena V.
Powiązania:
https://bibliotekanauki.pl/articles/417302.pdf
Data publikacji:
2015-09-15
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
investors
Pareto-optimality
modeling
Game Theory
Nash equilibrium
Government
economic behavior
Opis:
Purpose: This article deals with the problem of forming Pareto non-optimal norms of mutual behavior of investors and government in the process of decision-making related to financing designed to reduce risks in investment activity. Methodology: Considering the interdependent type (nature) of interactions between related parties, game theory tools were used to model such interactions. Much attention was directed to search for� parameters of interaction leading to certain Nash equilibriums in pure strategies. The formal results obtained with the model were verified by statistical analysis. Findings: Analysis showed that the rational behavior of related parties can lead to unexpected results. Powerful investors will aim to work in socially-oriented economies, whereas primarily small investors will operate in most liberal economies with a�minimum tax burden but with a�higher level of risk. As for governments’ behaviors, the images are the same: small economies tend to liberalize their tax systems and to secure investment faster than powerful ones. Empirical verification based on statistical data of groups of countries generally confirmed the conclusions. These formal and logical conclusions were from statistical analysis of 124 countries divided into 5 groups: OECD countries, post-socialist countries, Latin American countries, APAC countries and ACP countries. Provided that the more powerful ones are covered economies, there was stronger interdependence between the size of economies and tax burden and also between total investment and tax burden, where this dependence is positive. Originality: The results obtained used Nash equilibriums in pure strategies as models of behavioral norms to define behaviors of related parties and also to explain assumptions concerning the behaviors of investors and government.
Źródło:
Management and Business Administration. Central Europe; 2015, 3; 47-70
2084-3356
Pojawia się w:
Management and Business Administration. Central Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling computational studies of modified drug molecules binding to the LRRK2 protein in the treatment of Parkinson’s disease
Autorzy:
Shah, H.
Darsey, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/284742.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
LRRK2 proteins
Parkinson
Computational Modeling
IC50
Density Functional Theory
DFT
Opis:
Parkinson’s disease is a neurodegenerative and progressive disease of the central nervous system. It affects more than 10 million patients worldwide and the symptoms allow for little to no control for movement. These symptoms appear because the chemical messenger dopamine is being made in small quantities from impaired cells. However, the disease often forms when there is a mutation in the LRRK2 gene, as the functions of the protein become abnormal. The IC50 value is essential information about molecules because it measures their effectiveness. The goal of this research was to design molecules with a lower IC50 value. This was first done by modeling molecules on the molecular modeling program, Gaussian 09. Modifications were made to molecules that were said to bind to the LRRK2 protein. Modifications ranged from adding a single atom or replacing atoms with groups. After running these molecules on the program, the total energy was found. Using the equation found from the correlation between 1/IC50 and the total energy, the IC50 value was predicted for each of the modified molecules. Many of the modified molecules portrayed a positive percent difference between the original IC50 value and the new one. This saves both time and money because the molecules with lower IC50 values can be made, preserving the resources. After creating the molecule with a low IC50 value, further experimental procedures can be taken; this is a large step in assisting researchers to reach a potential treatment because it is more efficient.
Źródło:
Engineering of Biomaterials; 2018, 21, 145; 2-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the historical policy mixes for Poland using the game approach
Autorzy:
Kruś, L.
Woroniecka-Leciejewicz, I.
Powiązania:
https://bibliotekanauki.pl/articles/205620.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
game theory
economic modeling
policy-mix
decision analysis
Nash equilibrium
Pareto optimality
Opis:
The study here presented pertains to the analysis of mutual interactions of the monetary and fiscal policies in the case of Poland. The historical policies carried out during different periods of time and their economic effects are compared with the possible strategies, obtained from the analysis of the proposed monetaryfiscal game. In the study, the methods of non-cooperative game theory are combined with macroeconomic modeling. The respective game is formulated for monetary and fiscal authorities as players. Strategies of these players refer to the respective instruments of their policies: the real interest rate and the budget deficit in relation to GDP. Payoffs include inflation and GDP growth, respectively. The payoffs are calculated using a recursive macroeconomic model estimated for the Polish economy. The model describes influences of the instruments of the monetary and fiscal policies on the state of the economy. The best response strategies, the Nash equilibria and Pareto optimality are analyzed. Changes of the policies towards the more restrictive or more expansive ones and their effects in comparison to the historically applied are discussed. This is performed for two different time periods – the time of recovery after 2004 and the time of the global financial crisis after 2008.
Źródło:
Control and Cybernetics; 2018, 47, 3; 277-300
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On nonlocal modeling in continuum mechanics
Modelowanie nielokalne w mechanice kontinuum
Autorzy:
Martowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/368969.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
solid mechanics
long-range force interactions
nonlocal theory of elasticity
nonlocal modeling
Opis:
The objective of the paper is to provide an overview of nonlocal formulations for models of elastic solids. The author presents the physical foundations for nonlocal theońes of continuum mechanics, followed by vanous analytical and numeńcal techniques. The characteristics and range of practical applications for the presented approaches are discussed. The results of numerical simulations for the selected case studies are provided to demonstrate the properties of the described methods. The paper is illustrated with outcomes from peridynamic analyses. Fatigue and axial stretching were simulated to show the capabilities of the developed numeńcal tools.
W artykule dokonano przeglądu nielokalnych sformułowań dla mechaniki bryły odkształcalnej. Autor przedstawia podstawy fizyczne nielokalnych teorii mechaniki kontinuum oraz dokonuje przeglądu technik analitycznych i numerycznych stosowanych w modelach matematycznych. W pracy przedyskutowano charakterystyki oraz zakres praktycznych zastosowań wspomnianych technik modelowania. Ocena własności nielokalnych modeli została przeprowadzana na podstawie wyników symulacji numerycznych dla wybranych typów analiz z zastosowaniem perydynamiki. Przedstawiono wyniki symulacji zmęczeniowych oraz jednoosiowego rozciągania, uzyskane przy użyciu opracowanych narzędzi analiz symulacyjnych.
Źródło:
Mechanics and Control; 2015, 34, 2; 41-46
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Simulation of the Production Flow with the Implementation of Kanban and DBR
Autorzy:
Tomaszewska, Klaudia
Powiązania:
https://bibliotekanauki.pl/articles/24200493.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
modeling
control optimization
real-time control
process control
lean manufacturing
theory of constraints
Opis:
Currently, we live in a culture of being overly busy, but this does not translate into efficiency, speed of implementation of the actions taken. Enterprises are constantly looking for methods and tools to make them more efficient. The most popular method of production management is Lean Manufacturing, less known is Theory of Constraints. This work is a continuation of the research on the comparison of these methods with apply a computer simulation, which the analyzed production process in the selected enterprise, after 24 hours and week. An attempt was made to simplify the comparison of the methods based on the obtained simulation in terms of costs. In analyzed case, more advantageous solution is to use the DBR method. To produce various orders that do not require 100% production on the bottleneck position, the use of Kanban is a frequent practice as it provides greater flexibility in order execution.
Źródło:
Management and Production Engineering Review; 2023, 14, 2; 79--87
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of firm-based organizational citizenship behavior on continuance and normative commitment among pharmaceutical executives: An SEM approach
Autorzy:
Oamen, Theophilus Ehidiamen
Powiązania:
https://bibliotekanauki.pl/articles/2189661.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
organizational citizenship behavior
normative commitment
pharmaceutical industry
structural equation modeling
social exchange theory.
continuance commitment
Opis:
Aim/purpose – The study was based on social exchange theory and addressed the effects of firm-based organizational citizenship behavior (OCB) on normative and continuance organizational commitment (OC). Multigroup behavioral differences among pharmaceutical executives were also evaluated. Design/methodology/approach – This study employed an empirical, explanatory cross-sectional study with online questionnaires administered to four hundred and one randomly selected pharmaceutical executives in Nigeria. The covariance-based structural equation modeling technique was used for testing hypotheses. Firm-based OCB domains –conscientiousness, sportsmanship, and civic virtue were regressed on OC domains of continuance, and normative. The hypothesized effects of firm-based OCB on the domains of OC were examined using Analysis of Moment Structures (AMOS). Findings – The structural model had acceptable fit measures. Conscientiousness and sportsmanship behaviors were negatively related to normative OC while civic virtue had a positive significant relationship with normative OC. Multigroup comparisons based on gender, profession, and type of organization revealed significant effects on the relations between civic virtue and normative OC. Employees highly vested with enhancing and representing their company’s image, tend to be more obligated to continue and remain with the organization. The more self-directed, and less-complaining employees are, the lower the tendency to remain with the organization. The nuances of group differences among employees had an impact on examined relationships. Research implications/limitations – Human resource managers should adequately stimulate and motivate employees to be ambassadors of the organization. This is achievable by instilling a sense of ownership and loyalty in employees. Further implications are discussed. Originality/value/contribution – The study disentangled the relations between OCB and OC in the context of pharmaceutical executives in a developing country. The study highlighted the essence of group-specific differences in behavioral evaluation among pharmaceutical executives.
Źródło:
Journal of Economics and Management; 2023, 45; 47-67
1732-1948
Pojawia się w:
Journal of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerial Target Flight Path Modeling using B-Spline Curves
Modelowanie trajektorii lotu celu powietrznego z wykorzystaniem krzywych B-sklejanych
Autorzy:
Bużantowicz, W.
Bezubik, B.
Powiązania:
https://bibliotekanauki.pl/articles/403292.pdf
Data publikacji:
2018
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
kinematics
trajectory
path modeling
spline theory
aerial target
kinematyka
modelowanie trajektorii
krzywa B-sklejana
cel powietrzny
Opis:
A method is presented for generating the flight path of an aerial target using B-spline curves developed for studying the combat effectiveness of anti-aircraft missiles and air defense systems. A procedure is described for determining the kinematic quantities (velocity, accelerations, angles of spatial orientation) that characterize the motion of an object along a set trajectory. Exemplary simulation results are included.
W artykule przedstawiono sposób generowania trajektorii lotu celu powietrznego z wykorzystaniem krzywych B-sklejanych, opracowany na potrzeby badań skuteczności bojowej rakiet przeciwlotniczych i zestawów rakietowych obrony powietrznej. Opisano procedurę wyznaczania wielkości kinematycznych (prędkości, przyspieszeń, kątów orientacji przestrzennej), charakteryzujących ruch obiektu po zadanej trajektorii. Zamieszczono przykładowe wyniki badań symulacyjnych.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2018, 9, 4 (34); 21-32
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indirect Control of Corporations: Analysis and Simulations
Autorzy:
Stach, I.
Powiązania:
https://bibliotekanauki.pl/articles/375977.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
corporate shareholding analysis
cooperative game theory
direct and indirect control
financial and economic modeling
power indices
Opis:
This paper is devoted to the concept of indirect control in corporate shareholding networks. This topic is important in financial economics. Since shareholding size does not actually reflect an investor’s power-control in corporate shareholding networks, diverse approaches to measuring the control-power of investors has been proposed. We focus in particular on a game-theoretical approach; specifically the model of Denti and Prati (2001) and its implementation to control sharing analysis and simulation in shareholding networks thanks to the computer program „Control Sharing Simulation”.
Źródło:
Decision Making in Manufacturing and Services; 2017, 11, 1-2; 31-51
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study of longitudinal forces in the coupling device of heavy freight trains
Autorzy:
Stokłosa, J.
Jaśkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/102629.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
heavy freight trains
longitudinal forces
coupling devices
Nadal criterion
modeling
simulation
theory of Kalker’s contact
Opis:
On the LHS line (Broad-gauge Metallurgical Line), far out West of the railway line with a gauge of 1520 mm, heavy goods trains for a gross weight 5500 tons and a length of 850 m are operated. The article presents the results of a simulation study of the forces that occur in the automatic coupling device of SA-3 type of Russian production train consisting of 60 coal wagons of Russian construction of gross mass 91 tons each. The train moves on the 1520 mm gauge tracks curve S type (the radius of curvature of curves 300 m). Simulation studies were conducted using the Train Module of program to dynamic study multielements systems of Universal Mechanism UM 6.0. Keywords: heavy freight trains, the longitudinal forces in the coupling device, Nadal criterion, modeling, simulation, the theory of Kalker’s contact.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 21; 24-30
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing self-determination theory and the L2 motivational self system and their relationships to L2 proficiency
Autorzy:
Takahashi, Chika
Im, Seongah
Powiązania:
https://bibliotekanauki.pl/articles/1047061.pdf
Data publikacji:
2020-12-18
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
L2 motivation
self-determination theory
L2 motivational self system
L2 proficiency
structural equation modeling
Opis:
This study empirically compares two often-utilized motivation theories in L2 studies: self-determination theory and the L2 motivational self system. It also examines the relationships among their motivational constructs, learners’ intended L2 learning effort, and L2 proficiency. While a number of studies have utilized these models in order to examine second language learners’ motivation, there has not been a thorough comparison of the two. Furthermore, while many studies have demonstrated the structural relationships between the motivational constructs of the two theories and the learner’s self-reported amount of effort, fewer studies have examined their L2 achievement. The results of this study indicated that the constituents in the two theories are correlated as predicted. Furthermore, while internalized types of motivation in self-determination theory predicted intended learning effort, which then led to L2 proficiency, the strength of the ideal L2 self was much weaker than the L2 learning experience, unlike what is argued in the theory.
Źródło:
Studies in Second Language Learning and Teaching; 2020, 10, 4; 673-696
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
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