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Wyświetlanie 1-100 z 4744
Tytuł:
The Challenges of Incorporating Realistic Simulations of Marine Protists in Biogeochemically Based Mathematical Models
Autorzy:
Davidson, Keith
Powiązania:
https://bibliotekanauki.pl/articles/763796.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Mathematical modelling, protists, NPZD models, PFT models, trait based models, IBM models
Opis:
Protists are key components of marine microbial communities and hence of the biogeochemical mathematical models that are used to study the interaction between organisms, and the associated cycling of carbon and other nutrients. With increased computing power, models of microbial communities have markedly increased in complexity in the last 20 years, from relatively simple single nutrient currency, nutrient-phytoplankton-zooplankton-detritus (NPZD) models to plankton functional type (PFT) or trait based models of multiple organisms, or individual based models (IBMs) of specific organisms. However, our recognition, if not parameterisation, of the physiological processes that underpin both autotrophic and heterotrophic protist nutrition and growth arguably have increased faster than our modelling capability, generating a wealth of new modelling challenges. This paper therefore reviews historical development, current capability, and the future directions and challenges in protist based mathematical modelling.
Źródło:
Acta Protozoologica; 2014, 53, 1
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orthogonal models: Algebraic structure and explicit estimators for estimable vectors
Autorzy:
Pereira, Artur
Fonseca, Miguel
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729750.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
linear models
mixed models
inference
orthogonal models
UBLUE
Opis:
We study the algebraic structure of orthogonal models thus of mixed models whose variance covariance matrices are all positive semi definite, linear combinations of known pairwise orthogonal projection matrices, POOPM, and whose least square estimators, LSE, of estimable vectors are best linear unbiased estimator, BLUE, whatever the variance components, so they are uniformly BLUE, UBLUE. From the results of the algebraic structure we will get explicit expression for the LSE of these models.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 29-44
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical analysis of underground coal gasification models. Part II: Kinetic and computational fluid dynamics models. Literary studies and comparison of models
Autorzy:
Żogała, A.
Powiązania:
https://bibliotekanauki.pl/articles/91950.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
coal gasification
kinetic models
CFD models
zgazowanie węgla
model kinetyczny
model CFD
Opis:
Purpose Underground coal gasification, as a complex and technically difficult process, in many aspects requires the support provided by computer simulations. There are a lot of mathematical models of UCG, some of them are concentrated with the forecast of syngas composition. The most important may be divided into three groups: equilibrium, kinetic and CFD models. The purpose of this work was the detailed critical analysis of more advanced approaches (than equilibrium considerations) applied in simulations of the coal conversion process – both kinetic and based on computational fluid dynamics. The other aim of this paper was the comparative analysis of the most important models of underground coal gasification. Methods Literary studies, concerned with the features and mathematical description of kinetic and CFD models of coal gasification, were used as the research method applied in the work presented. Compilation of the kinetic parameters of gasification reactions was an important part of this article. For that purpose the analysis of Polish and foreign papers, monographs and university handbooks was undertaken. Results Critical analysis of kinetic and CFD models of coal gasification (together with their mathematical formulation) was the result of considerations presented in this article. Kinetic equations were shown separately for pyrolysis, homogenous and heterogeneous reactions. In the case of CDF models, except for the presentation of the conservation equation, the most important methods of modeling turbulence are described (for the reason that this phenomenon may have significant inflence on the final results). Practical implications The work presented describes practical issues connected with kinetic and CFD models, focusing on their capabilities, drawbacks and possible application problems. Originality/ value This paper presents state of art in the field of coal gasification modeling using kinetic and computational fluid dynamics approach. The paper also presents own comparative analysis (concerned with mathematical formulation, input data and parameters, basic assumptions, obtained results etc.) of the most important models of underground coal gasification.
Źródło:
Journal of Sustainable Mining; 2014, 13, 1; 29-37
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The value-based paradigm and economization of company strategy and business models
Autorzy:
Jabłoński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/916180.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
business models strategy
business models
Opis:
The business processes’ constantly increasing dynamic occurred in companies forces them not only to create their new business models and strategies, but first of all to achieve appropriate profits. The aim of this paper is to discuss the role of business models strategy and economization, using the value-based paradigm. The author argues that currently designed business models and strategies should generate defined measurable financial results, at every stage of their implementation suitable to program them. Therefore, the application of such business models and strategies enables for an enterprise’s value increasing at its business development every stage.
Źródło:
Kwartalnik Nauk o Przedsiębiorstwie; 2014, 33, 4; 37-45
1896-656X
Pojawia się w:
Kwartalnik Nauk o Przedsiębiorstwie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele pracy edukacyjnej z ludźmi dorosłymi
Models of educational work with adult people
Autorzy:
Oleszak, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/443175.pdf
Data publikacji:
2011
Wydawca:
ADVSEO
Tematy:
MODELS OF SPECIALIZED EDUCATION
MODELS OF EDUCATIONAL WORK WITH ADULT PEOPLE
MODELS OF CURRICULUM
Opis:
Three models of educational work with adult people – technological, humanistic, and critical – distinguished by andragogists are presented in the paper. Educational practice, practice of adults education in particular is described. Possible distortions from knowledge coming from everyday life and common experience of people are shown.
Źródło:
General and Professional Education; 2011, 1; 35-42
2084-1469
Pojawia się w:
General and Professional Education
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Believable world of economic models
Autorzy:
Gorazda, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/691074.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
economic models
philosophy of economics
Opis:
Book review: Łukasz Hardt, Economics Without Laws. Towards a New Philosophy of Economics, Palgrave Macmillan, Cham, 2017, pp. 220.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 67; 251-261
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Income tax: a comparison of the forecasting methodologies
Autorzy:
Pavlik, Martin
Powiązania:
https://bibliotekanauki.pl/articles/425078.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
income tax
forecasting
ARCH models
GARCH models
EGARCH models
Akaike information criteria
Opis:
The author focuses on income tax forecasting. He compares the different forecasting methodologies. He also compares his solution to the official annual forecasts in the Slovak Republic. He chose the quarters of years as the time units.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 3(41); 104-112
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using MathCad environment to calculate leakage currents and power basis on percolation models
Autorzy:
Frączak, P.
Powiązania:
https://bibliotekanauki.pl/articles/97207.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
percolation
percolation models
calculations of percolation models
in Mathcad
Opis:
This work presents the design and analysis of percolation models for branches and nodes in networks created using electric circuits. Electric circuits were built using square networks consisting of appropriate resistance and impedance elements, as well as of power supply sources. The created percolation models were described mathematically, according to the Maxwell matrix method of cyclic current in the classical form and in the complex number form. Analytical descriptions of electric circuits include random methods of "short-circuiting" branches and creation of “filled” nodes, respectively, in the networks using appropriate calculation procedures in Mathcad. Simulation calculations of surface leakage current for a polymer sample were made using a model of its surface (percolation for a branch in the network) and a numerical program developed on the basis of calculation procedures contained in Mathcad. On the other hand, simulation calculations of power emitted on the surface of a cylindrical insulator performed using its surface model (percolation for nodes in the network) and a numerical program written in the Mathcad environment.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 255-267
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele odwrotne i modelowanie diagnostyczne
Inverse models and diagnostic modeling
Autorzy:
Cholewa, W.
Powiązania:
https://bibliotekanauki.pl/articles/328712.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
modele odwrotne
modele diagnostyczne
sieci przekonań
inverse models
diagnostic models
belief networks
Opis:
Praca dotyczy ogólnej metodologii badań diagnostycznych, Wskazano podejścia bazujące na biernych i czynnych eksperymentach diagnostycznych. Zaproponowano podejście mieszane, w którym stosowane są modele odwrotne współdziałające ze szczególnymi układami wnioskującymi wykonanymi z zastosowaniem sieci przekonań. Opracowanie zawiera ogólne wprowadzenie do modeli odwrotnych oraz do sieci przekonań.
The paper deals with a general methodology for diagnostic investigations. It presents basic approaches connected with passive as well as active diagnostic experiments. It suggests a mixed approach making use of inverse models followed by a particular diagnostic reasoning done by means of belief networks. The paper contains a basic introduction to the inverse models and to belief networks.
Źródło:
Diagnostyka; 2004, 30, T. 1; 111-114
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Models for Corporate Credit Risk Assessment – Rating Models
Modele statystyczne do oceny ryzyka kredytowego przedsiębiorstw – modele ratingowe
Autorzy:
Ptak-Chmielewska, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/657890.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
modele statystyczne
modele ratingowe
analiza historii zdarzeń
statistical models
rating models
event history analysis
Opis:
Dostrzegając słabość modeli opartych na funkcji dyskryminacyjnej Z-score zaproponowanej przez Altmana w warunkach gospodarki polskiej podjęto w latach 90. próby dostosowania tych modeli do realiów gospodarki post-komunistycznej. Początkowe zainteresowanie modelami wielowymiarowej analizy dyskryminacyjnej poszerzono o modele regresji logistycznej a później również o sieci neuronowe i drzewa decyzyjne. W ostatnich latach podjęto również próby zastosowania modeli analizy historii zdarzeń. Modele ratingowe oparte na wypracowanych modelach upadłości stanowią kluczowy element w zarządzaniu ryzykiem kredytowym. W artykule podjęto próbę krytycznej oceny stosowanych metod statystycznych oraz wskazano na zalety i wady różnych podejść do budowy modeli. Przeprowadzono porównawczą analizę empiryczną na próbie przedsiębiorstw. Wskazano na możliwość wykorzystania modeli statystycznych do oceny ryzyka kredytowego przedsiębiorstw (modele ratingowe).
Taking into consideration the weakness of the models based on discrimination function (Z-score) proposed by Altman within the conditions of polish economy some attempts were taken in the 90s to adjust these models to the reality of post-communist economy. The initial interest in the models of multivariate discriminant analysis was extended by logistic regression models and then also by neural networks and decision trees. In the recent years some attempts were also taken to apply models of the event history analysis. Rating models based on developed bankruptcy risk models are basic element in credit risk management. Paper focuses on the critical assessment of statistical methods applied and points out the advantages and disadvantages of various approaches toward the estimation of models. Empirical comparative analysis were conducted based on the sample of enterprises. The possible application of statistical models in credit risk assessment of enterprises (rating models) was pointed out.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2016, 3, 322
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linking EPC models – an alternative approach
Autorzy:
Szczęśniak, B.
Powiązania:
https://bibliotekanauki.pl/articles/360759.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
hierarchical EPC models
business process modelling
Opis:
Even though the literature is abundant in numerous studies concerning syntactic and semantic principles of the EPC model development, one may still have certain doubts when linking such models with one another. This article primarily addresses the principles of creating EPC models, particularly those relevant from the perspective of linking them, identified based on the literature research. What follows the said analysis is a proposal of an alternative concept which may be adopted in this respect. The author has discussed the cases in which models must be subject to specific modifications in order for the linking solution proposed to be applicable.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 34 (106); 79-84
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspectival representation in DSGE models
Autorzy:
Kawalec, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/943142.pdf
Data publikacji:
2017-09-30
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
DSGE models
scientific representation
objectivity
empirical grounding
Opis:
DSGE models (Introduction) have recently been criticized by P. Romer (2016) as pseudoscientific (Section 1). Their dominance is attributed to the uncritical “deference to authority” that has dominated macroeconomics “for the last 30 years”. In contrast, the paper aims to support the widespread view that – their problems notwithstanding – DSGE models meet the epistemic standards of scientific research. The argument turns on the recent advancements in theories of scientific representation (Section 1) and of empirical grounding (Section 2). The latter is illustrated with a historical case, which also substantiates Romer’s constructive point on the role of theory in design of measurements.
Źródło:
Economics and Business Review; 2017, 3(17), 3; 80-99
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Animal models – a critical evaluation
Autorzy:
Gee, Jennifer M.
Powiązania:
https://bibliotekanauki.pl/articles/2051053.pdf
Data publikacji:
2003
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
animal models
intestine
novel foods
evaluation
Opis:
This review addresses the need to evaluate the biological effects of novel foods, how this can be achieved and the role of animal models in this process. The selection of an appropriate model or combination of approaches is most important, together with an awareness of the shortcomings of that particular method. In mammals the gastrointestinal tract not only acts as the site of absorption of nutrients and non-nutrients, but provides a protective barrier between the environment and the body. As such this interface is exposed to relatively high concentrations of the individual chemicals that are dietary components. It is therefore essential to understand how novel foods can change the structure, growth and function of the gut in particular. Effects may be both beneficial and detrimental and have an impact on the function of other organs in the body. However, due to the wide-ranging implications of this broad topic, the discussion here will focus on events within the gastrointestinal tract, in the context of the evaluation of novel foods.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2003, 53, 1s; 35-38
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
F-tests for generalized linear hypotheses in subnormal models
Autorzy:
Mexia, Joao
Dias, Gerberto
Powiązania:
https://bibliotekanauki.pl/articles/729870.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
F-tests
subnormal models
mixed models
invariance
UMP tests
third type error
Opis:
When the measurement errors may be assumed to be normal and independent from what is measured a subnormal model may be used. We define a linear and generalized linear hypotheses for these models, and derive F-tests for them. These tests are shown to be UMP for linear hypotheses as well as strictly unbiased and strongly consistent for these hypotheses. It is also shown that the F-tests are invariant for regular transformations, possess structural stability and are almost strongly consistent for generalized linear hypothesis. An application to a mixed model studied by Michalskyi and Zmyślony is shown.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2001, 21, 1; 49-62
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical Log-linear Models for Contingency Tables
Hierarchiczne modele logarytmiczno-liniowe dla tablic kontyngencji
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/906850.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
log-linear models
hierarchical log-linear models
AIC
BIC
Opis:
Log-linear models are widely used for qualitative data in multidimensional contingency tables. Hierarchical log-linear models are models that include all lower-order terms composed from variables contained in a higher-order model term. The starting point is a saturated model, then homogenous associations, conditional independence and complete independence. There are several statistics that help to choose the best model. The first is the likelihood ratio approach, next is AIC and BIC information criteria. In R software there is loglm() function in MASS library and glm in stats library. The first approach is presented in this paper
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2012, 269
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the Mapping Models of the Players Cooperation in Serve Reception in Volleyball
Autorzy:
Mazur, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/1832377.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
volleyball
cooperation
mapping models
service reception
game models
Olympic Games
Opis:
Introduction: Identifying cooperation in team games is a difficult process to implement. Thanks to the development of methods and techniques of game observation, it is possible to reliably and accurately identify and evaluate the actions of players. The collections of various analyzes are used to create pragmatic game models. There are several types of such models. The paper presents models representing effective cooperation in the game on the example of volleyball. Aim of the study: The aim of the study was to identify mapping models of effective cooperation in the game, in the game positioning phase - in the element of receiving-passing the ball (serves). The second goal was to present the differences and similarities between observed teams. Material and methods: The work uses a method called qualitative study of unique cases, the research material consists of the four highest-ranked teams from Rio de Janeiro 2016 Olympic Games. Results: Four different models of cooperation in receiving-passing the ball (serve) were identified. Each of them contains characteristic features visible in the figures. Conclusions: Various models of cooperation have been identified. Each team has a specific model of receiving-passing the ball (serve) due to the spatial flexibility. The models presented in the paper are effective because they show the cooperation of the best teams in the world.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2021, 35, 3; 71-85
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-Markov control models with average costs
Autorzy:
Luque-Vásquez, Fernando
Hernández-Lerma, Onésimo
Powiązania:
https://bibliotekanauki.pl/articles/1338792.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
average cost
replacement models
semi-Markov control models
policy iteration (or Howard's algorithm)
Opis:
This paper studies semi-Markov control models with Borel state and control spaces, and unbounded cost functions, under the average cost criterion. Conditions are given for (i) the existence of a solution to the average cost optimality equation, and for (ii) the existence of strong optimal control policies. These conditions are illustrated with a semi-Markov replacement model.
Źródło:
Applicationes Mathematicae; 1999, 26, 3; 315-331
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fire Detection Methods Based on Various Color Spaces and Gaussian Mixture Models
Autorzy:
Munshi, Amr
Powiązania:
https://bibliotekanauki.pl/articles/2123292.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fire detection
fire pixels
fire-like pixels
color models
Gaussian mixture models
Opis:
Fire disasters are very serious problems that may cause damages to ecological systems, infrastructure, properties, and even a threat to human lives; therefore, detecting fires at their earliest stage is of importance. Inspired by the technological advancements in artificial intelligence and image processing in solving problems in different applications, this encourages adopting those technologies in reducing the damage and harm caused by fire. This study attempts to propose an intelligent fire detection method by investigating three approaches to detect fire based on three different color models: RGB, YCbCr, and HSV are presented. The RGB method is applied based on the relationship among the red, green and blue values of pixels in images. In the YCbCr color model, image processing and machine learning techniques are used for morphological processing and automatic recognition of fire images. Whereas for the HSV supervised machine learning techniques are adopted, namely decision rule and Gaussian mixture model (GMM). Further, the expectation maximization (EM) algorithm is deployed for the GMM parameters estimation. The three proposed models were tested on two data sets, one of which contains fire images, the other consists of non-fire images with some having fire-like colors to test the efficiency of the proposed methods. The experimental results showed that the overall accuracies on two data sets for the RGB, YCbCr, and HSV methods were satisfactory and were efficient in detecting outdoor and indoor fires.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 197--214
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating Models of Relational Competence Theory
Autorzy:
L‛Abate, Luciano
Powiązania:
https://bibliotekanauki.pl/articles/637095.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
evidence, method, models, validation, theory, writing
Opis:
The purpose of this article is to summarize methods used to evaluate the 16 Models of Relational Competence Theory (RCT). Methods to verify the validity and usefulness of these Models must take into account how these models are interrelated. This interrelatedness allows to evaluate participants with single and multi-function statically objective self-report, paper-and--pencil tests. Psychological interventions occur dynamically and systematically through workbooks, written, interactive practice exercises, administered to participants at a distance. Workbooks were developed from theory-derived, theory-related, or theory-independent sources and objective tests and measures, thus combining and matching evaluation with intervention in ways that would be diffi cult if not impossible to accomplish verbally in face-to-face psychotherapy.
Źródło:
Psychologia Rozwojowa; 2010, 15, 2
1895-6297
2084-3879
Pojawia się w:
Psychologia Rozwojowa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele wektorowo-autoregresyjne jako odpowiedź na krytykę strukturalnych wielorównaniowych modeli ekonometrycznych
Vector Autoregression Models (VAR) - Response to Criticism Structural Econometric Models
Autorzy:
Wójcik, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/585848.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Ekonometria
Modele ekonometryczne
Modele wielorównaniowe
Modelowanie ekonometryczne
Econometric modeling
Econometric models
Econometrics
Multi-equation models
Opis:
In seventies, structural models were subjected to the criticism more and more. In the article the author presented reasons of the criticism of structural models and theoretical bases of vector autoregression models which was introduced in article C. A. Sims in 1980. An example of using VAR models was also expressed for the modelling of macroeconomic variables. In the summary the author described defects and virtues of VAR models in the context of the structural attempt at the econometric modelling.
Źródło:
Studia Ekonomiczne; 2014, 193; 112-128
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innowacyjne modele biznesu dla IT – wyzwania i perspektywy rozwoju
Innovative IT business models − challenges and prospects
Autorzy:
Sobińska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/432068.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
management
business models
IT sourcing models
cloud computing
innovations
Opis:
Information Technology (IT) shapes the success of organizations, giving them a solid foundation that increases both their level of efficiency as well as productivity. New and innovative business models based on advanced information and communication technologies are to promote the growth of enterprises and the flexibility of creating greater value for their stakeholders. The aim of the article is to discuss the challenges and trends facing organizations in the context of the selection and implementation of new business models with particular emphasis on sourcing models in the IT area. Moreover, the article will investigate the impact of IT sourcing models on innovation and competitiveness of the organization.
Źródło:
Informatyka Ekonomiczna; 2014, 1(31); 126-137
1507-3858
Pojawia się w:
Informatyka Ekonomiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Speaker Model Clustering to Construct Background Models for Speaker Verification
Autorzy:
Dişken, G.
Tüfekci, Z.
Çevik, U.
Powiązania:
https://bibliotekanauki.pl/articles/177299.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Gaussian mixture models
k-means
imposter models
speaker clustering
speaker verification
Opis:
Conventional speaker recognition systems use the Universal Background Model (UBM) as an imposter for all speakers. In this paper, speaker models are clustered to obtain better imposter model representations for speaker verification purpose. First, a UBM is trained, and speaker models are adapted from the UBM. Then, the k-means algorithm with the Euclidean distance measure is applied to the speaker models. The speakers are divided into two, three, four, and five clusters. The resulting cluster centers are used as background models of their respective speakers. Experiments showed that the proposed method consistently produced lower Equal Error Rates (EER) than the conventional UBM approach for 3, 10, and 30 seconds long test utterances, and also for channel mismatch conditions. The proposed method is also compared with the i-vector approach. The three-cluster model achieved the best performance with a 12.4% relative EER reduction in average, compared to the i-vector method. Statistical significance of the results are also given.
Źródło:
Archives of Acoustics; 2017, 42, 1; 127-135
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limitations in detailing of EPC models
Autorzy:
Szczęśniak, B.
Powiązania:
https://bibliotekanauki.pl/articles/358980.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
hierarchical EPC models
business process modelling
hierarchical functions
Opis:
EPC models provide a subject widely discussed in the literature. The principles applicable, while creating them have been elaborated upon in numerous publications. An analysis of the existing principles indicates certain inconsistencies as far as the creation of hierarchical models is concerned. The problem of combining equivalent EPC models using process interfaces has been discussed in the author’s previous publication. This paper continues to elaborate upon the problems previously raised, pertaining to EPC model linking by means of hierarchical functions. It addresses principles significant from the perspective of creating and linking such models using the aforementioned approach. Specific questionable situations have been described and individual solutions proposed to enable avoiding them.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 39 (111); 151-155
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sufficiency in bayesian models
Autorzy:
Furmańczyki, Konrad
Niemiro, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1339087.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
sufficiency
connditional independence
Bayesian models
prediction sufficiency
freedom
Opis:
We consider some fundamental concepts of mathematical statistics in the Bayesian setting. Sufficiency, prediction sufficiency and freedom can be treated as special cases of conditional independence. We give purely probabilistic proofs of the Basu theorem and related facts.
Źródło:
Applicationes Mathematicae; 1998-1999, 25, 1; 113-120
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Brief review of logit models applications in regional studies
Autorzy:
Markowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/584013.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
review
logit models
regional studies
Opis:
The problems referring to the functioning of economy are closely related to a territory. The place of their occurrence, whether it is a country, a region or a smaller territorial unit, implies the scale and the benchmark for carrying out analyses. Numerous phenomena within the area of economic research are of complex nature and, moreover, it is frequently difficult to express them in a measurable form. The solution to such “inconvenience” is e.g. the application of qualitative variables. Logistic regression is one of the tools allowing the assessment of dependence and prediction in case of qualitative variables of dichotomous type. The purpose of the study is to review the applications of logit models in regional studies.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2017, 476; 9-17
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business models in Circular Economy concept
Autorzy:
Rudnicka, Agata
Powiązania:
https://bibliotekanauki.pl/articles/583073.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
business model
Circular Economy
circular business models
sustainability
Opis:
It seems that in the 21st century business needs to adapt faster than ever to the expectations of the external environment. This makes it necessary to look for new solutions that give the opportunity to reconcile the needs and expectations of consumers who are increasingly aware and enterprise which are trying to meet new requirements. As a result there is a change in the perception of existing business models and a move beyond the linear economic model. The new optics of looking at business is both legitimate and necessary. One of such concepts is Circular Economy (CE) which incorporates the existing management concepts into the strategic idea of natural resources protection. What is more, the assumptions of the CE are coherent with the postulates of sustainable development and, in particular, environmental aspects, which constitutes its additional value. The aim of the article is to present the idea of CE in terms of business models.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2018, 520; 106-114
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macro Models of Vehicle Kilometres Travelled
Autorzy:
Jamroz, Kazimierz
Wachnicka, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/503726.pdf
Data publikacji:
2015
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
road traffic
kilometres travelled
forecast models
Opis:
There are a number of ways to measure transport of which kilometres travelled is the most frequent macro indicator (at country level). It is used to estimate projected fuel consumption, potential number of vehicles, amount and type of exhaust fumes emissions and the number of road accidents and casualties. The paper presents macro models of vehicle kilometres travelled, built on the basis of data from some fifty countries worldwide. Next, the resulting model was calibrated for the conditions in Poland.
Źródło:
Logistics and Transport; 2015, 27, 3; 17-24
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele diagnostyczne przekładni zębatej
Models diagnostic of toothed gear
Autorzy:
Królicki, Z.
Żółtowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/328607.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
modele diagnostyczne
modele dynamiczne
sygnał diagnostyczny
przekładnie zębate
diagnostic models
dynamic models
diagnostic signal
toothed gears
Opis:
W artykule przedstawiono problematykę związaną z badaniami drganiowymi przekładni zębatej. Głównym zagadnieniem jest próba opracowanie oryginalnego modelu przekładni zębatej na podstawie modeli już istniejących. Szczególny nacisk położono na merytoryczną poprawność modelu tak aby odzwierciedlał założony charakter wybranych stanów przekładni . Rozważania kończą się na poziomie modelu palisadowego. Celem dalszego postępowania będzie możliwie maksymalne uproszczenie modelu.
Growing larger application on methods and centres of technical diagnostics, being with tool of modern manner of creating "qualities" of machines. Rational usage diagnoses makes possible undertaking of relating decision qualities and further conducts with machine. Can this to be decision about further use, about collection of definite interventions preventive or to introduction of changes in construction, of technology or of exploitation of machines.
Źródło:
Diagnostyka; 2004, 32; 83-88
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A polytomous item response theory models using R
Politomiczne modele teorii odpowiedzi na pozycje testowe w programie R.
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/425272.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
IRT models
multidimensional IRT models
measurement theory
R software
Opis:
Item response theory (IRT) is widely used in educational and psychological research to model how participants respond to test items in isolation and in bundles. Item response theory has replaced classical measurement theory as a framework for test development, scale constructions, scree reporting and test evaluation. The most popular of the item response models for multiple choice tests are the one-parameter (i. e. the Rasch model) and threeparameter models. This is the general framework for specifying the functional relationship between a respondent’s underlying latent trait level, commonly known as ability in educational testing, or the factor score in the factor analysis tradition and an item level stimulus. In this paper, arguments are offered for continuing research and applying multidimensional IRT models. The position is also taken that multi-parameter IRT models have potentially important roles to play in the advancement of measurement theory about which models to use should depend on model fit to the test data. All calculations are conducted in R available from CRAN which is a widely-used and well-known environment for statistical computing and graphics.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 2 (52); 43-52
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Współczesne modele dydaktyki uniwersyteckiej
CONTEMPORARY MODELS OF UNIVERSITY TEACHING
Autorzy:
Pierścieniak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/417455.pdf
Data publikacji:
2010
Wydawca:
Akademickie Towarzystwo Andragogiczne
Tematy:
UNIVERSITY EDUCATION
UNIVERSITY MODELS
UNIVERSITY TEACHING
Opis:
The article describes the transformation of the idea of university education from medieval to modern times. From a historical perspective factors have been presented which influenced changes in teaching approaches at universities. This article presents contemporary social and ideological factors that affect the functioning of the university model. In the final section the author presents his own typology for contemporary models of university teaching.
Źródło:
Rocznik Andragogiczny; 2010, R. 2010
1429-186X
2391-7571
Pojawia się w:
Rocznik Andragogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Equivalence of Small and Large Orifice Computational Models
Autorzy:
Kubrak, M.
Powiązania:
https://bibliotekanauki.pl/articles/241432.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
orifice
velocity
flow
computational models
Opis:
The aim of this paper was to analyze theoretical aspects of calculating steady water flow through unsubmerged circular orifices. Theoretical analysis shows that the values of discharge obtained by using formulas intended for small orifices are greater than those calculated using formulas for large orifices. These differences attain a maximum value when the water level reaches the upper edge of the orifice, and decrease when water head increases. It has been proven that the volumetric flow rate for circular unsubmerged orifices can be calculated by formulas for small orifices when the water level above the center of gravity is at least four times as high as the diameter of the orifice.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2015, 62, 3-4; 67-76
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimax estimation in linear models
Estymacja minimax w modelach liniowych
Autorzy:
Drygas, Hilmar
Powiązania:
https://bibliotekanauki.pl/articles/905020.pdf
Data publikacji:
1993
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Linear models
minimax estimation
BLME
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 1993, 132
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leadership and mental models. Study of school principals’ awareness
Autorzy:
Mazurkiewicz, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/639306.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Educational leadership
mental models
change
development
Opis:
The main purpose of the proposed paper is to analyze paradigms (theoretical frames) of leadership owned and used by school principals. The analysis is based on the results of the research conducted for the purpose of defining and describing the school principals’ way of thinking about leadership for education. For the purpose of building framework for research it was assumed that four leadership paradigms might be defined. Leadership might be understood through classic paradigm of leadership (domination of the significant person or elite group); or transactional paradigm (influence and negotiations); or visionary paradigm (called sometimes charismatic where the most import ant is clear vision); or organic paradigm (existing in multicultural and diverse world where leadership is flexible and leaders change dependently on a situation) Three methods have been used: interview with 99 principals of schools (of different type), observation in the same number of schools and analyses of the blogs (written on-line by school principals). It is common to ignore the mental models (or paradigms) used by people what brings certain outcomes for every initiative. It is necessary for policy making, change projects or developmental initiatives to recognize and take under consideration the diversity of possible perspectives (mental models) owned by those who are working in the concerned area, in this case head teachers. Civilization changes influence context and demands towards schools. Those challenges impact the modernization of schools. One of the common expectation towards management are more open - participative mode of the decision making process and the involvement of employees in sharing responsibilities. Unfortunately different initiatives towards inclusion of employees into management and leadership processes bring rather disappointing results because they ignore ideologies and assumptions of people who decide about school functioning. Analysis of the results of the research should improve the understanding of the school reality by showing strategies and decisions adequate to the state of “educational consciousness”.
Źródło:
Zarządzanie Publiczne; 2012, 4(20); 27-48
2084-3968
Pojawia się w:
Zarządzanie Publiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of quantum computation and quantum programming languages
Autorzy:
Miszczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/200159.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
programming languages
models of computation
Turing machine
Opis:
The goal of the presented paper is to provide an introduction to the basic computational models used in quantum information theory. We review various models of quantum Turing machine, quantum circuits and quantum random access machine (QRAM) along with their classical counterparts. We also provide an introduction to quantum programming languages, which are developed using the QRAM model. We review the syntax of several existing quantum programming languages and discuss their features and limitations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 305-324
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying Political Violence Using Game Theory Models: Research Approaches and Assumptions
Autorzy:
Wajzer, Mateusz
Cukier-Syguła, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2014252.pdf
Data publikacji:
2020-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
political violence
game theory
classical models
evolutionary models
Chicken game
Prisoner’s Dilemma game
Opis:
The purpose of the paper is to concisely present basic applications of game theory models for a scientific description of political violence. The paper is divided into four parts. The first part discusses the key theoretical issues including: the assumption of the players’ rationality, the assumption of the players’ common knowledge of their rationality, the Nash equilibrium concept, Pareto optimality, the Nash arbitration scheme and the concept of evolutionarily stable strategies. The second and third parts contain examples of uses of selected models of classical and evolutionary games in the studies on political violence. The following two interaction schemes were used to that end: the Prisoner’s Dilemma and Chicken. The paper ends with a summary and discussion. The key feature of the discussed models is their methodological simplicity, as demonstrated by the lack of need to use complicated mathematical methods. This is why the paper is mainly addressed to individuals who had not studied game theory before or who have insufficient knowledge in the field to conduct own studies.
Źródło:
Polish Political Science Yearbook; 2020, 2 (49); 143-157
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absolutely saturated models
Autorzy:
Ehrlich, Philip
Powiązania:
https://bibliotekanauki.pl/articles/1215538.pdf
Data publikacji:
1989
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1989, 133, 1; 39-46
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homology with models
Autorzy:
George, Daryl
Powiązania:
https://bibliotekanauki.pl/articles/1363523.pdf
Data publikacji:
1984
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1984, 122, 1; 33-45
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelki w rozmiarze „zero” vs. modelki XXL – zapowiedź końca kultury slim/fit?
Plus-size models vs. size-zero models: is the slim/fit culture going to end?
Autorzy:
Krogulec, Martyna Anna
Powiązania:
https://bibliotekanauki.pl/articles/2139308.pdf
Data publikacji:
2019-12-31
Wydawca:
Wydawnictwo Naukowe Dolnośląskiej Szkoły Wyższej
Tematy:
kultura slim/fit
modelki XXL
modelki w rozmiarze zero
społeczny odbiór nadwagi w modzie
slim/fit culture
plus-size models
size-zero models
social reception of plus-size models
Opis:
Żyjemy w XXI wieku, w dobie kultu szczupłej, wysportowanej sylwetki. Wysokie wymagania względem spełniania narzuconego wzorca stawiane są szczególnie w stosunku do przedstawicielek świata modelingu, gdzie od lat dominuje wizerunek sylwetki w rozmiarze „zero”. Ostatnio jesteśmy jednak świadkami coraz częstszego promowania tzw. modelek XXL, czyli modelek noszących rozmiary 42 i większe. Jednocześnie można zauważyć, że w zamożnych krajach Zachodu ciągle przybywa osób z nadwagą i otyłością. W tych okolicznościach pojawia się pytanie, jaki jest odbiór społeczny modelek XXL? Poszukując odpowiedzi na to pytanie, autorka porównała blisko 650 opinii Internautów pod trzema artykułami dotyczącymi kampanii firmy bieliźniarskiej Lane Bryant pt. „#I’mNoAngel”, w których modelki XXL zostały bezpośrednio przeciwstawione modelkom o bardzo szczupłej budowie ciała –„Aniołkom” Victoria’s Secret.
In the 21st century, the slim, athletic body has become an object of worship, especially in the modeling business. Fashion models need to meet strict requirements. They are expected to be youthful and thin (not slim) to the max. Recently, however, the popularity of plus-size models has been on the rise. At the same time, the number of people suffering from obesity and overweight has also been increasing. These findings call into question the public perception of plus-size models. Do potential consumers see them as more approachable? Looking for the answer to this question, the author has compared nearly 650 comments on three articles concerning Lane Bryant’s “#I’mNoAngel” advertising campaign, in which plus-size models were presented as an alternative to the size-zero models : Victoria’s Secret Angels.
Źródło:
Forum Oświatowe; 2019, 31, 1(61); 135-154
0867-0323
2450-3452
Pojawia się w:
Forum Oświatowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation of System Dynamics Models – a Case Study
Autorzy:
Lemke, Justyna
Łatuszyńska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/475155.pdf
Data publikacji:
2013
Wydawca:
Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:
validation of simulation models
system dynamics
Opis:
The purpose of this article is the analysis of the system dynamics model validation illustrated by the example of a model of the manufacturing resource allocation. In the first part of the article the authors present an overview of the definitions of validation and verification that can be found in the reference literature. Also, they emphasize the role which validation and verification play in the modeling process. Furthermore, they discuss the techniques of system dynamics model validation with particular focus on tests of the model structure, behavior and policy implications. The second part of the article contains an example of the validation process of a system dynamics model simulating manufacturing resource allocation in an electronic company. The purpose of the model is to assess the long-term effect of assigning workers to individual tasks on such production process parameters as efficiency or effective work time. The authors focus their particular attention on that part of the model which deals with a storehouse, one of the company production units. They conduct tests of its structure and behavior. When validating the structure the authors make use of the information obtained in a series of interviews with the company staff. They also refer to the generally accepted knowledge found in the reference literature. The results generated by the model in the course of the behavior tests are compared with the real data. The authors evaluate both the logic of the system behavior and the level of accuracy of the output data in reference to the real system.
Źródło:
Journal of Entrepreneurship, Management and Innovation; 2013, 9, 2; 45-59
2299-7075
2299-7326
Pojawia się w:
Journal of Entrepreneurship, Management and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strictly associated models, prime basis factorials: an application
Autorzy:
Carvalho, Francisco
Powiązania:
https://bibliotekanauki.pl/articles/729866.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
COBS
strictly associated models
prime basis factorials
inference
Opis:
Mixed models will be considered using the Commutative Jordan Algebra of Symmetric matrices approach. Prime basis factorial models will now be considered in the framework provided by Commutative Jordan Algebra of Symmetric matrices. This will enable to obtain fractional replicates when the number of levels is neither a prime or a power of a prime. We present an application to the effect of lidocaine, at an enzymatic level, on the heart muscle of beagle dogs
Źródło:
Discussiones Mathematicae Probability and Statistics; 2011, 31, 1-2; 77-86
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele ekonomiczne z dynamiką chaotyczną
The Economic Models with Chaotic Dynamics
Autorzy:
Miśkiewicz-Nawrocka, Monika
Powiązania:
https://bibliotekanauki.pl/articles/590326.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Modele ekonomiczne
Economic models
Opis:
Since 1975, when the R. May and J.R. Beddington informed about the possibility of application of chaos theory in economics, built many new economic models with chaotic dynamics and chaos have been identified in a number of already existing models. This paper presents briefly the theory of deterministic chaos and properties of chaotic dynamic. In addition, presents some economic models of chaotic dynamics.
Źródło:
Studia Ekonomiczne; 2013, 132; 56-66
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:
Recognition of narrowband radio signals using autoregressive models and pattern comparison approach
Autorzy:
Łopatka, J.
Powiązania:
https://bibliotekanauki.pl/articles/308156.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
signal models
modulation recognition
Opis:
This paper presents an improved spectral recognition method for digitally modulated radio signals. It is based on a signal autoregressive (AR) model. Model poles are used as signal features for neural network based on recognition process. To reduce an influence of the signal noise and distortions introduced by the digital receiver, a nonlinear Z plane transformation is proposed.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 56-59
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models, manifestation and attribution of climate change
Autorzy:
von Storch, H.
Bray, D.
Powiązania:
https://bibliotekanauki.pl/articles/108472.pdf
Data publikacji:
2017
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
survey
climate change
models
climate scientist
Opis:
Results from a series of five surveys among five groups of international climate scientists about their evaluation of elements of climate models and of climate change are presented. The first survey was done in 1996, the latest in 2015/16. Thus, our snapshots of the opinions of climate scientists cover 20 years. The results describe a strong increase in agreement concerning issues of manifestation of climate change, i.e., that the warming is real and not influenced by changing measuring and reporting practices, and concerning attribution of this ongoing climate change to ongoing anthropogenic causes. On the other hand, the evaluation of the climate models has changed little in the past 20 years. There are still significant reservations with the models ability to incorporate clouds and to describe rainfall. Obviously the growing conviction of ongoing man-made climate change is based on a variety of explanations, with modelling not being the predominant line of evidence. We suggest that it may be the repeated assessments by the IPCC, based on paleoclimatic evidence and stringent statistical analysis of the instrumental record which have led to the growing consensus of the warming and its causation. We stress that the presented results concern the opinion of climate scientists with a rather broad background. Our results do not assess if the opinions of the surveyed scientists are “valid” or “right”, but they recognize the character of science being a social process.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2017, 5, 1; 47-52
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Community social work and her models
Autorzy:
Pavelová, Ľuba
Powiązania:
https://bibliotekanauki.pl/articles/2141363.pdf
Data publikacji:
2011
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
Social work
Community social work
Models of community social work
Opis:
Community social work offers possible solutions to various problems through their models. These models are seen various different authors and do not practice social work all underused. The contribution brings excursion area of theoretical models and their definitions, suggesting the possibility of their practical use.
Źródło:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne; 2011, 1(6); 155-173
1898-8431
Pojawia się w:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business targets and corporate governance models
Autorzy:
Samborski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/27313693.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
practices
business target
corporate governance models
differences in management
praktyki
Opis:
Purpose: The purpose of the study was to compare the management practices of American, German and Polish enterprises in the cross-section of business objectives analysed. Design/methodology/approach: The paper assumes that the differences in setting business objectives result from the differences in corporate governance models. The study used the Kruskal-Wallis One-way Analysis of Variance by Ranks and multiple comparisons of mean ranks for all samples. Findings: The study found that some of the management practices of German, Polish and American enterprises differed across business objectives. However, differences in management practices did not always coincide with differences in corporate governance models. The research shows that corporate governance institutions do not always explain existing differences in management practices, and that the setting of business objectives also depends on other factors. Originality/value: The conducted research enriches the literature in the area of strategic management by issues concerning the determinants of setting business goals in enterprises.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 157; 431--445
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear mathematical models of weakly loaded contact joints
Autorzy:
Skrodzewicz, J.
Gutowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/279491.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
contact joint
energy dissipation
nonlinear models
Opis:
The paper presents nonlinear mathematical models describing the properties of dry and lubricated contact joints loaded in normal direction. The energy dissipation coefficient... is expressed as a function of the load amplitude. The structure of the models is defined on the basis of the experimentally determined spectral-response characteristics of relative displacements of the contact surfaces, and of contact load in the normal direction. The form of the functional factors of models is estimated of the linear regression analysis.
Nieliniowe modele matematyczne połączeń stykowych słabo obciążonych. W pracy przedstawiono nieliniowe modele matematyczne opisujące właściwości połączeń stykowych suchych i smarowanych obciążonych w kierunku normalnym. Podano także zależności współczynnika rozproszenia energii... w funkcji amplitudy obciążenia. Strukturę modeli określono na podstawie eksperymentalnie wyznaczonych charakterystyk widmowych sygnałów przemieszczeń względnych nominalnych powierzchni styku i obciążenia styku w kierunku normalnym. Postaci czynników funkcyjnych modelu wyestymowano stosując metody regresji liniowej.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 781-789
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring innovation maturity – literature review on innovation maturity models
Autorzy:
Inków, Monika
Powiązania:
https://bibliotekanauki.pl/articles/432430.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
innovation capability
innovation maturity
innovation maturity models
Opis:
In recent years it has noticed that innovation and innovativeness have become the basis for the success of not only individual business entities but entire regions and economies. What is more, there have been opinions in the literature that individual innovations are no longer a guarantee of survival for an organization, but such a guarantee is rather the capacity for continuous innovation. Therefore the organization’s ability to transform resources in favour of the organization – the innovation capability – is decisive, while the ability to use resources appropriately, including innovation capabilities, is referred to as innovation maturity. In this article the author decided to introduce the essence of innovation maturity models as a tool for measuring innovation maturity. These models are a tool for assessing the level of innovation maturity of an organization. It is worth adding that maturity models originate from the Capability Maturity Model developed by the Software Engineering Institute.
Źródło:
Informatyka Ekonomiczna; 2019, 1 (51); 22-34
1507-3858
Pojawia się w:
Informatyka Ekonomiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On accuracy of current geopotential models estimated through comparison of quasi-geoid models and GPS/levelling data
Autorzy:
Novak, P.
Kostelecky, J.
Klokocnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/224436.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geopotencjał
ggm
levelling
GPS
geopotential
global geopotential models
niwelacja
Opis:
Gravity-dedicated satellite missions CHAMP and GRACE provide accurate data that can be inverted into geopotential coefficients forming global geopotential models (GGM). Through an estimation process, mean square errors of these coefficients can be elvaluated. In most cases, even the entire variance-covariance matrices are computed. However, these errors are only formaI and do not represent weIl the actual accuracy of estimated coefficients, thus also of various gravity field parameters synthesized from these coefficients. For this reason validation procedures for the new GGMs are being sought since the classical validation methocts reached their limits. This article discusses the validation procedure of the GGM through its comparison with idependent data estimated at selected GPS/leveIling stations over the area of Central Europe. Due to a different spectral content of height anomalies synthesized from the GGM and of those derived from combination of ellipsoidal and normal heights at selected points of the European Vertical Reference Network, the GGM-based low-frequency height anomaly is completed for a missing higth-frequency component based on high resolution and high accuracy ground gravity and elevation data. The methodology is also applied on a set of GPS/leveIling stations in the Czech Republic. In accordance with previous validation tests of GGMs based on data of crossover altimetry, obtained results indicate that the current GGMs estimated from single/dual-sateIlite data seem to have significant problems namely with low-order and degree coefficients.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 245-251
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On choosing the fuzziness parameter for identifying TS models with multidimensional membership functions
Autorzy:
Kroll, A.
Powiązania:
https://bibliotekanauki.pl/articles/91761.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
fuzzy clustering
structure/fuzzy partitioning
Takagi-Sugeno fuzzy models
TS fuzzy models
fuzziness parameter m
fuzzy classifier
Opis:
Fuzzy clustering is a well-established method for identifying the structure/fuzzy partitioning of Takagi-Sugeno (TS) fuzzy models. The clustering algorithms require choosing the fuzziness parameter m. Prior work in the area of pattern recognition shows, that a suitable choice of m is application- dependent. Yet, the default of m=2 is commonly chosen. This paper examines the suitable choice of m for identifying TS models. The focus is on models that use the classifiers resulting from fuzzy clustering as multi-dimensional membership functions or their projection and approximation. At first, the differentiability and grouping properties of the fuzzy classifiers are analyzed to make a general recommendation of choosing m(1;3). Besides, the effect of the cluster number c on the classification fuzziness is examined. Finally, requirements that are specific to TS modeling are introduced, which narrow down the suitable range for m. Building on algorithm analysis and four case studies (function approximation, a vehicle engine and an axial compressor application for nonlinear regression), it is demonstrated that choosing m2(1;1.3) for local and m2(1;1.5) for global estimation will typically provide for good results.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 4; 283-300
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Averaged models of pulse-modulated DC-DC power converters. Part II. Models based on the separation of variables
Autorzy:
Janke, W.
Powiązania:
https://bibliotekanauki.pl/articles/140855.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power converters
pulse width modulation (PWM)
BUCK
buck-boost
BOOST
averaged models
Opis:
The separation of variables approach to formulate the averaged models of DC-DC switch-mode power converters is presented in the paper. The proposed method is applied to basic converters such as BUCK, BOOST and BUCK-BOOST. The ideal converters or converters with parasitic resistances, working in CCM and in DCM mode are considered. The models are presented in the form of equation systems for large signal, steady-state and small-signal case. It is shown, that the models obtained by separation of variables approach differ in some situations from standard models based on switch averaging method.
Źródło:
Archives of Electrical Engineering; 2012, 61, 4; 633-654
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machine learning models for predicting patients survival after liver transplantation
Autorzy:
Jarmulski, W.
Wieczorkowska, A.
Trzaska, M.
Ciszek, M.
Paczek, L.
Powiązania:
https://bibliotekanauki.pl/articles/305726.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
machine learning
models interpretability
survival prediction
generalized additive models (GAM)
liver transplant
Opis:
In our work, we have built models predicting whether a patient will lose an organ after a liver transplant within a specified time horizon. We have used the observations of bilirubin and creatinine in the whole first year after the transplantation to derive predictors, capturing not only their static value but also their variability. Our models indeed have a predictive power that proves the value of incorporating variability of biochemical measurements, and it is the first contribution of our paper. As the second contribution we have identified that full-complexity models such as random forests and gradient boosting lack sufficient interpretability despite having the best predictive power, which is important in medicine. We have found that generalized additive models (GAM) provide the desired interpretability, and their predictive power is closer to the predictions of full-complexity models than to the predictions of simple linear models.
Źródło:
Computer Science; 2018, 19 (2); 223-239
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic bridge between BPMN models and UML activity diagrams based on graph transformation
Autorzy:
Rahmoune, Yasmina
Chaoui, Allaoua
Powiązania:
https://bibliotekanauki.pl/articles/27312904.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
MDE
BPMN
business process models
UML-AD
meta-modeling
graph grammars
models transformation
AToM3
Opis:
Model-driven engineering (MDE) provides the available tools, concepts, and languages for creating and transforming models. One of the most important successes of MDE is model transformation; it permits the transformion of models that are used by one community to equivalent models that can be used by another one. Moreover, each community of developers has its own tools for verification, testing, and test-case generation. Hence, a developer of one community who moves to another community needs a transformation process from the second community to his/her own community and vice versa. Therefore, the target community can benefit from the expertise of the source one, and the developers do not begin from zero. In this context, we propose an automatic transformation in this paper for creating a bridge between the BPMN and UML communities. We propose an approach and a visual tool for the automatic transformation of BPMN models to UML activity diagrams (UML-AD). The proposed approach is based on meta-modeling and graph transformation and uses the AToM3 tool. Indeed, we were inspired by the OMG meta-models of BPMN and UML-AD and implemented versions of both meta-models using AToM3 . This latter one allows for the automatic generation of a visual-modeling tool for each proposed meta-model. Based on these two meta-models, we propose a graph grammar that is composed of 58 rules that perform the transformation process. The proposed approach is illustrated through three case studies.
Źródło:
Computer Science; 2022, 23 (3); 411--445
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early Warning Models of Banking Crises: VIX and High Profits
Autorzy:
Bańbuła, Piotr
Pietrzak, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2075289.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
early warning models
financial stability
Opis:
We built a logistic regression Early Warning Models (EWM) for banking crises in a panel of 47 countries based on data from 1970–2014 using candidate variables that cover macro and financial market indicators. We find that VIX, a proxy of global risk-premium, has a strong signalling properties and that low VIX (low price of risk) increases likelihood of crisis. It does not only mean that stability leads to instability, but that this tends to be a global rather than a domestic phenomenon. We also find that particularly high contribution of financial sector to GDP growth often precedes crises, suggesting that such instances are primarily driven by excessive risk taking by financial sector and may not necessarily be sustainable. Other variables that feature prominently include credit and residential prices. Models using multiple variable clearly outperform single variable models, with probability of correct signal extraction exceeding 0.9. Our setting includes country-specific information without using country-specific effects in a regression, which allows for direct application of EWM we obtain to any country, including these that have not experienced a banking crisis
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2021, 4; 381-403
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical EPC models – review of model linking concepts
Autorzy:
Szczęśniak, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/2064927.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
business process modelling
EPC
BPM
linking of process models
Opis:
EPC models are currently among the leading standard business process modelling solutions. As long as the rules for creating flat EPC models are explicit and raise no significant doubts, when it comes to linking models of different types, the literature of the subject delivers diversified solutions. Four such alternative concepts that can be applied in this respect have been identified and described in this article. They have been used to link EPC models for four cases proposed. These cases differ as to the degree of complexity, and they represent different kinds of potential links between processes being modelled. Using the concepts in question with reference to the cases defined has made it possible to identify situations in which it is impossible to link models, or when it raises certain doubts. What has also been proposed is that one of the concepts identified in the paper can be modified in such a manner that using it to link EPC models does not pose any problem in any of the cases discussed.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 476--486
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of logistic support systems
Autorzy:
Nowakowski, T.
Werbińska-Wojciechowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/2069667.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
logistic support system
maintenance modelling
inventory models
procurement process
Opis:
We present an overview of some recent developments in the area of inventory planning and maintenance scheduling issues. The emphasis is on spare part inventory models, which authors divided into four main groups of models: models of optimal spare part inventory policy for system under PM, number of spare parts optimization models, storage reliability models, multi-echelon systems models. Later, in the paper there is considered the time dependent system of systems where the system total task must be executed during the constrained time resource. There is used the simulation approach to investigate the influence of parameters of the procurement process (order quantity, critical inventory level, lead-time length) on the system of systems behavior.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 325--344
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods to generate Numerical Models of Terrain for spatial ENC presentation
Autorzy:
Sassais, R.
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/320693.pdf
Data publikacji:
2011
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
ENC
numerical models
GIS
Opis:
In the paper the methods to generate Numerical Models of Terrain for spatial visualization have been shown. For spatial visualization the application has been created, uses TIN, GRID methods: inverse distance to a power, nearest neighbour and natural one and NURBS (Non- Uniform Rational B-Splines). Methods have been used for spatial presentation of ENC data.
Źródło:
Annual of Navigation; 2011, 18; 69-81
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of text models with information streams
Autorzy:
Korostil, Y.
Korostil, O.
Powiązania:
https://bibliotekanauki.pl/articles/360682.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
models
semantics
synthesis
texts
grammar
objects
functioning
output
Opis:
The methods of synthesis of text models with information streams are researched. In the process of functioning of system of text models, which model systems of social objects the following are implemented: analysis of models of monitoring of information means, used by social objects, control of adequacy of models to objects and objects management. The synthesis of text models with information streams is implemented basing on use of semantic parameters. In process of text forms synthesis of models description and information streams appears necessity to output new text fragments, reflecting synthesis result. Such output processes are procedures based on use of logical schemas and grammar rules.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 33 (105); 51-56
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Where do Moderation Terms Come from in Binary Choice Models?
Autorzy:
Romero, Alfredo A.
Powiązania:
https://bibliotekanauki.pl/articles/483295.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moderation terms
moderation effects
logit models
Opis:
If the most parsimonious behavioral model between an observed behavior, Y , and some factors, X, can be defined as f(Y|X1,X2), then fx1 will measure the impact in behavior of a change in factor X1. Additionally, if fx1x2 != 0, then the impact in behavior of a change in factor X1 is qualified, or moderated by X2. If this is the case, X2 is said to be a moderating variable and fx1x2 is said to be the moderating effect. When Y is modeled via a logistic regression, the moderation effect will exist regardless of whether the index function of the logit specification includes a moderation term or not. Thus, including a moderation terms in the index function will help the researcher more precisely qualify the moderation effect between X1 and X2. The question that naturally arises is whether the researcher must include the moderation term or not. In this document, we provide the conditions in which moderation terms will naturally arise in a logistic regression and introduce some modeling guidelines. We do so by introducing a general framework that nests models with no moderation terms in three scenarios for the independent variables, commonly found in applied research.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2014, 1; 57-68
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transitional Justice Models and Analytic Philosophy: Towards Theory
Autorzy:
Krotoszyński, Michał
Powiązania:
https://bibliotekanauki.pl/articles/594689.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
transitional justice
analytic philosophy
models
idealisation
humanistic interpretation
values
Opis:
As an interdisciplinary field of scholarship, transitional justice is still in its pre-theoretical stage, focusing mainly on the case and comparative studies, supported by general considerations concerning justice in the times of transition. To entrench the field as a distinct area of studies, a theory of transitional justice needs to be formulated. The article explores the possibility of making a step towards such a theoretical basis with the use of the tools of analytical philosophy, methodology and legal theory. First, drawing on Leszek Nowak’s procedure of idealisation, three basic models of responses to a painful past are formulated. Then, distinct transitional justice values are attributed to each of the models. Finally, with the use of Jerzy Kmita’s concept of humanistic interpretation, the article seeks to conceptualize the way in which these values – among other factors, such as the need to uphold the rule of law or to preserve the stability of a democratic system – influence the choice of a model of transitional justice response. Thus, the aim of the presented models – which I described in more detail elsewhere (Krotoszyński 2017) – is to provide a sound theoretical basis for some of the fundamental claims formulated in the field of transitional justice.
Źródło:
Polish Political Science Yearbook; 2017, 2 (46); 9-21
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of flotation processes by classical mathematical methods – a review
Modelowanie procesu flotacji przy pomocy klasycznych metod matematycznych – przegląd
Autorzy:
Jovanovic, I.
Miljanovic, I.
Powiązania:
https://bibliotekanauki.pl/articles/219078.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flotation
mathematical modelling
empirical models
probabilistic models
population-balance models
kinetic models
flotacja
modelowanie matematyczne
modele empiryczne
modele probabilistyczne
modele równowagi populacji
modele kinetyczne
Opis:
Flotation process modelling is not a simple task, mostly because of the process complexity, i.e. the presence of a large number of variables that (to a lesser or a greater extent) affect the final outcome of the mineral particles separation based on the differences in their surface properties. The attempts toward the development of the quantitative predictive model that would fully describe the operation of an industrial flotation plant started in the middle of past century and it lasts to this day. This paper gives a review of published research activities directed toward the development of flotation models based on the classical mathematical rules. The description and systematization of classical flotation models were performed according to the available references, with emphasize exclusively given to the flotation process modelling, regardless of the model application in a certain control system. In accordance with the contemporary considerations, models were classified as the empirical, probabilistic, kinetic and population balance types. Each model type is presented through the aspects of flotation modelling at the macro and micro process levels.
Modelowanie procesów flotacji nie jest zagadnieniem prostym, głównie z uwagi na skomplikowany charakter samego procesu, czyli znaczną liczbę zmiennych które, w mniejszym lub w większym stopniu, mają wpływ na końcowy wynik procesu separacji cząstek materiału wykorzystującego różnice w ich właściwościach powierzchniowych. Próby stworzenia ilościowego modelu predyktywnego który w sposób pełny opisywałby przemysłowe procesy flotacji podjęto w połowie ubiegłego wieku a badania trwają po dzień dzisiejszy. W artykule przedstawiono przegląd działalności badawczej podejmowanej w celu opracowania modelu procesu flotacji opartego o zasady matematyki klasycznej. Opisu i systematyki modeli flotacji dokonano w oparciu o dostępną literaturę przedmiotu, główny nacisk kładąc na te modele, które wykorzystywane były wyłącznie do analizy procesu flotacji, bez względu na możliwość ich zastosowania także w układach sterowania. Zgodnie z obecnymi założeniami, modele sklasyfikowano jako empiryczne, probabilistyczne, kinetyczne oraz modele równowagi populacji. Każdy model zaprezentowany jest w kontekście modelowania procesu flotacji, z uwzględnieniem skali mikro oraz makro.
Źródło:
Archives of Mining Sciences; 2015, 60, 4; 905-919
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kryteria wyboru dynamicznych modeli czynnikowych dla celów prognostycznych
Selection Criteria for Forecasting Dynamic Factor Models
Autorzy:
Acedański, Jan
Powiązania:
https://bibliotekanauki.pl/articles/589725.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Metody prognozowania
Modele autoregresji
Modele ekonometryczne
Prognozowanie makroekonomiczne
Macroeconomic forecasting, Forecasting methods, Autoregression models, Econometric models
Opis:
The paper compares three groups of methods used for best dynamic factor model selection for forecasting: modified information criteria, methods exclusively based on ex post forecasts analysis and mixed algorithms. It searches for the approach that delivers best out-of-sample forecasts according to mean square error measure. The analysis utilizes both Monte Carlo generated samples as well as real time series used for forecasting consumer inflation in Poland. Results show that best forecasts are obtained from the modified information criteria proposed by Groen and Kapetanios, whereas the methods that employ ex post forecasts from rolling windows usually give the worst predictions.
Źródło:
Studia Ekonomiczne; 2013, 124; 193-216
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on countable models
Autorzy:
Benda, Miroslav
Powiązania:
https://bibliotekanauki.pl/articles/1376123.pdf
Data publikacji:
1974
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1973-1974, 81, 2; 107-119
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of axiomatic systems
Autorzy:
Mostowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1383351.pdf
Data publikacji:
1952
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1952, 39, 1; 133-158
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Network models: an assessment
Autorzy:
Pawelec, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/634657.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Opis:
This article – based on a larger study (Pawelec 2009) – has two aims. The more limited one is to present network models proposed by Ronald Langacker and George Lakoff. I try to show that both ventures rest on manifestly different assumptions, contrary to the widespread view that they are convergent or complementary. Langacker’s declared aim is “descriptive adequacy”: his model serves as a global representation of linguistic intuitions, rooted in convention. Lakoff, on the other hand, offers a developmental model: a fairly general abstract schema is “imagistically” specified and transformed, while the more specific schemas serve as the basis for metaphorical transfers. My wider aim is to offer a preliminary assessment of theoretical justifications and practical potential of network models in lexical semantics.
Źródło:
Studia Linguistica Universitatis Iagellonicae Cracoviensis; 2010, 127
2083-4624
Pojawia się w:
Studia Linguistica Universitatis Iagellonicae Cracoviensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sufficiency in linear models
Autorzy:
Drygas, Hilmar
Powiązania:
https://bibliotekanauki.pl/articles/721040.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Banach Center Publications; 1985, 16, 1; 67-72
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing Innovative Business Models in Social Ventures
Autorzy:
Jokela, Päivi
Elo, Maria
Powiązania:
https://bibliotekanauki.pl/articles/475083.pdf
Data publikacji:
2015
Wydawca:
Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:
social entrepreneurship
social ventures
business models
social value creation
Opis:
Social ventures represent a new type of organization that aim to create sustainable social value, such as promoting the well-being of communities and their existence is based on developing solutions to tackle complex social problems. Developing a suitable business model for a social venture is crucial because the right model with a sustainable value offering in its core can support the venture and direct it toward self-sustainability and competitiveness. Research on social venture business models has been so far limited and particularly innovation in business models needs more inquiry. Through an in-depth case study, we aim to extend the understanding how business models of social ventures can meet these goals and how the business model elements interact with each other. The study findings indicate that opportunity recognition which is followed by innovative resource mobilization and integration can turn into a well-functioning business-model that serves the desired ends, creating social value and help to achieve self-sustainability. Furthermore, establishing the right interconnections between the business model elements was found to support the development of an efficient social venture business model.
Źródło:
Journal of Entrepreneurship, Management and Innovation; 2015, 11, 1; 103-118
2299-7075
2299-7326
Pojawia się w:
Journal of Entrepreneurship, Management and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected models of information warfare in cyberspace
Autorzy:
Bielawski, Radosław
Radomska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/576343.pdf
Data publikacji:
2017-03-21
Wydawca:
Akademia Sztuki Wojennej
Tematy:
cyberspace
information models
national security
military system
critical
infrastructure
Opis:
One form of activity in cyberspace is the information battle. One of the proposed definitions will define it as a negative co–operation in the sphere of information acquisition, information distortion and information defense, where each side of the action is subordinated to the antagonistic side of the other. It leads to the achievement of political objectives and is aimed at overthrowing the systems of the state responsible for the state of its security. It is important that this condition is at a high, or at least acceptable, level. To ensure this level, it is important to define cybersecurity fighting models that are adequate for the threats and to determine their impact on the level of national security risk in cyberspace. Literature on the subject contains many models of cyberwarfare information that have been shaped in recent years. However, there is no assessment of the adequacy of these models for the risks and risks associated with national security threats. It should be noted that information security itself, as part of national security, is variable. New threats are emerging and, at a very high rate and with high activity in cyberspace, they are capable of destabilising the security of key state administration bodies, military facilities and other important state– run infrastructures. It should be emphasised that existing cyberspace fighting information models are not universal and cannot be used for any type of threat to national security. They need to find, organise and evaluate those that would be the most appropriate not only for national security threats but also for geopolitical determinants. Assumptions for the research and its results are a noticeable increase in the number of cyberattacks, some of which are important from the point of view of national security – the military system and critical infrastructure elements of the state. The following subject of the research was adopted in the article – models of information fight, related to threats to national security coming from / to cyberspace. The purpose of scientific research is to define models of information combat and to determine the suitability and evaluation of these models for the purpose of evaluating the risks of national security threats. Identifying the subject and objectives of the research led to a general research question: What appropriate models of information fight in cyberspace can be defined and used for the risks of national security threats? The research method applied theoretical methods (analysis, synthesis, generalisation, abstraction, inference, analogy and comparison) as well as the empirical method of dialogue and the method of participant observation.
Źródło:
Security and Defence Quarterly; 2017, 14, 1; 35-50
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of selective cationic amphipatic antibacterial peptides by Hidden Markov models
Autorzy:
Polanco, Carlos
Samaniego, Jose
Powiązania:
https://bibliotekanauki.pl/articles/1040652.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Hidden Markov models
antibacterial peptides
Opis:
Antibacterial peptides are researched mainly for the potential benefit they have in a variety of socially relevant diseases, used by the host to protect itself from different types of pathogenic bacteria. We used the mathematical-computational method known as Hidden Markov models (HMMs) in targeting a subset of antibacterial peptides named Selective Cationic Amphipatic Antibacterial Peptides (SCAAPs). The main difference in the implementation of HMMs was focused on the detection of SCAAP using principally five physical-chemical properties for each candidate SCAAPs, instead of using the statistical information about the amino acids which form a peptide. By this method a cluster of antibacterial peptides was detected and as a result the following were found: 9 SCAAPs, 6 synthetic antibacterial peptides that belong to a subregion of Cecropin A and Magainin 2, and 19 peptides from the Cecropin A family. A scoring function was developed using HMMs as its core, uniquely employing information accessible from the databases.
Źródło:
Acta Biochimica Polonica; 2009, 56, 1; 167-176
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reluctant Role Models: Men Teachers and the Reproduction of Hegemonic Masculinity
Autorzy:
Sargent, Paul
Powiązania:
https://bibliotekanauki.pl/articles/2106924.pdf
Data publikacji:
2013-07-31
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Masculinities
Men Teachers
Male Role Models
Boys
Opis:
In-depth interviews with men teachers and other key personnel in early childhood education (ECE) revealed that the men are attempting to perform a type of subordinate masculinity that could challenge traditional gender relations. However, their attempts are thwarted by the gender regime embedded in the occupational structure, particularly the demand that they perform as “male role models” for the boys in their classes. This means that they are prescribed to perform in stereotypical ways and to purposely model traditional masculinity to boys, thereby inculcating hegemonic norms of masculinity.
Źródło:
Qualitative Sociology Review; 2013, 9, 3; 188-203
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesian Variations on the Frisch and Waugh Theme
Autorzy:
Osiewalski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/483315.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bayesian inference
regression models
SURE models
VAR processes
data transformations
Opis:
The paper is devoted to discussing consequences of the so-called Frisch-Waugh Theorem to posterior inference and Bayesian model comparison. We adopt a generalised normal linear regression framework and weaken its assumptions in order to cover non-normal, jointly elliptical sampling distributions, autoregressive specifications, additional nuisance parameters and multi-equation SURE or VAR models. The main result is that inference based on the original full Bayesian model can be obtained using transformed data and reduced parameter spaces, provided the prior density for scale or precision parameters is appropriately modified.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2011, 3, 1; 39-47
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparision of Two Construction Algorithms for Takagi-Sugeno Fuzzy Models
Autorzy:
Nelles, O.
Fink, A.
Babuska, R.
Setnes, M.
Powiązania:
https://bibliotekanauki.pl/articles/911156.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modelowanie
identyfikacja
model rozmyty
turbosprężarka doładowująca
modeling
identification
Takagi-Sugeno fuzzy models
local linear models
turbocharger
Opis:
This paper compares two different approaches to the construction of Takagi-Sugeno fuzzy models from data. These models approximate nonlinear systems by means of interpolation between local linear models. The main issue in the construction of Takagi-Sugeno models is the decomposition of the operating space into validity regions for the local models. The way this decomposition is done influences the complexity, accuracy and transparency of the obtained model. The first of the presented methods, the local linear model tree (LOLIMOT) algorithm generates incrementally the fuzzy model by axis-orthogonal decomposition of the input space. In the other method, product-space fuzzy clustering (the Gustafson-Kessel algorithm) is used to partition the available data into fuzzy subsets. The fundamental advantages and drawbacks of both the alternative strategies are pointed out. Their properties and real-world applicability are illustrated by building a dynamic model of a truck Diesel engine turbocharger.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 4; 835-855
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IRT and LC-IRT models for items with ordinal polytomous responses
Modele IRT oraz LC-IRT dla zmiennych politomicznych (o kategoriach uprządkowanych)
Autorzy:
Genge, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/425165.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
IRT theory
polytomous IRT models
latent trait
latent class models
Opis:
Item response theory (IRT) is a model-based theory in which the responses to test items depend on some person and item characteristics, according to specific probabilistic rela-tions. The simplest and most popular are dichotomous IRT models that specify a single (i.e. unidimensional) latent trait under the assumption of normal distribution. This article reviews the latent class ordinal polytomous item response models (LC-IRT) and presents the compari-son with the well-known traditional IRT models (based on the assumption of a normally dis-tributed latent trait). The main goal of the article is to compare the estimation results of differ-ent kinds of ordinal polytomous IRT models with continuous and discrete latent variable in measuring job satisfaction in Poland. We analyzed data collected as part of the International Social Survey Programme using the ltm and MultiLCIRT packages of R.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2017, 4 (58); 62-76
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie łączonych modeli lokalnych w diagnostyce maszyn
Application of joined local models in the technical diagnostics
Autorzy:
Wojtusik, J.
Powiązania:
https://bibliotekanauki.pl/articles/327348.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
modele lokalne
modele globalne
wielomodele
zbiory rozmyte
agregacja
local models
global models
multi-model
fuzzy sets
aggregation
Opis:
Współczesna diagnostyka techniczna stosująca model boryka się często ze zbyt dużym stopniem złożoności stosowanych modeli. Rozwiązania tego problemu, najczęściej stosowane dotychczas, polegały na upraszczaniu niektórych zależności modelu bądź świadomym pomijaniu niektórych wejść obiektu celem uproszczenia struktury modelu. W referacie przedstawiono odmienne podejście polegające na stosowaniu zbioru stosunkowo prostych modeli lokalnych w miejsce jednego złożonego modelu globalnego. Taki zbiór modeli lokalnych nazywany jest wielomodelem.
Nowadays technical diagnostics that applies a model struggles very often with a high-complexity degree of applying model. Solutions of that problem, applied most frequent so far, consisted in simplifying of some model relations or conscious omitting of some object inputs with the purpose of making a model structure simpler. In the paper, it is presented inflected approach that consists in application of a set of simply local models instead one complex global model. Such a set of local models is called multi-model.
Źródło:
Diagnostyka; 2004, 30, T. 2; 191-194
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of evolutionary algorithms to identification of diagnostic inverse models
Zastosowanie algorytmów ewolucyjnych w identyfikacji odwrotnych modeli diagnostycznych
Autorzy:
Urbanek, G.
Powiązania:
https://bibliotekanauki.pl/articles/327842.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
modele wielostopniowe
odwrotne modele diagnostyczne
algorytmy ewolucyjne
multi-stage models
diagnostic inverse models
evolutionary algorithms
Opis:
Determination of two-stage models with auxiliary signals is one of possible method of inverse models identification based on examples. First stage of this diagnostic model can be a classifier based on selected features that classifies examples to predefined auxiliary signals classes. The efficiency of the model identified in this way depends on set of the selected features. The proposed method of evolutionary search of relevant features set and the obtained results of the research were described in the paper.
Jedną z metod identyfikacji odwrotnych modeli diagnostycznych na podstawie przykładów jest wyznaczanie ich jako modeli dwustopniowych z użyciem sygnałów dodatkowych. Pierwszy stopień takiego modelu może być rozpatrywany jako klasyfikator, który na podstawie wybranych cech sygnałów diagnostycznych klasyfikuje przykłady do klas zdefiniowanych w przestrzeni cech sygnałów dodatkowych. Jakość tak identyfikowanego modelu zależy w głównej mierze od użytego zbioru cech sygnałów diagnostycznych. W artykule przedstawiono zaproponowaną metodę ewolucyjnego poszukiwania zbioru cech relewantnych oraz wybrane wyniki przeprowadzonych badań.
Źródło:
Diagnostyka; 2006, 2(38); 57-60
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reputation determinants of the banking sector in Poland
Autorzy:
Idzik, Marcin
Gieorgica, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2052147.pdf
Data publikacji:
2019-12-31
Wydawca:
Bankowy Fundusz Gwarancyjny
Tematy:
banks
reputation
structural equation models (SEM – Structural Equation Models)
Opis:
The objective of this paper is to identify the determinants of reputation of the banking sector in Poland and to segment the society according to the factors that shape the reputation. Banks in Poland have a good reputation. The factors of a good reputation are in clear advantage over the factors of a bad reputation. The most important things in shaping the banks’ reputation are the axiological determinants. Their significance is three times as high as the effectiveness determinants linked to the satisfaction with the banking services, and it is much higher than the impact of the normative determinants connected with the institutional aspects of the banking sector. The three selected homogeneous typological groups of consumers differ from each other in terms of normative, axiological and altruistic determinants that shape the reputation. The effectiveness determinants do not diversify the consumers in terms of their impact on the the banks’ reputation assessment. The most important touch points that shape the banks’ reputation are: consumers’ personal experience, customer service attendants in the banks, friends’ opinions as well as the opinions of the people who are regarded by the consumers as experts. When modelling the reputation determinants, a structural equation modelling method (SEM) was used. Studies were carried out on a nationwide representative sample of N=1000 residents of Poland using the CAPI method in March 2019.
Źródło:
Bezpieczny Bank; 2019, 77, 4; 81-109
1429-2939
Pojawia się w:
Bezpieczny Bank
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abiotic Factors in Crop Models
Czynniki abiotyczne w modelach roślinnych
Autorzy:
Kulig, B.
Powiązania:
https://bibliotekanauki.pl/articles/388264.pdf
Data publikacji:
2010
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
matematyczne modele roślin
czynniki abiotyczne
crop models
abiotic factors
Opis:
Dynamic development of models describing growth, development and yielding of plants was observed in the last quarter of the 20th century. Explanatory models interpreting the phenomena constitute a specific group. Modeling of biomass accumulation is most frequently presented on three levels of productivity: potential, limited by the access to water and minerals and obtainable (reduced by the presence of weeds, diseases and pests). Modeling provides plenty of valuable information for proper interpretation and better understanding of the investigated process. Knowledge obtained in this way may be used to conduct so called simulation experiments using models, which can be of particular importance for research on the protection of the natural environment (eg migration and transformation of pesticides, biogens or heavy metals in soil).
W ostatnim ćwierćwieczu XX w. nastąpił dynamiczny rozwój modeli opisujących wzrost, rozwój i plonowanie roślin. Szczególną grupę stanowią modele wyjaśniające (mechanistyczne) mechanizmy zjawiska (ang. explanatory model). Modelowanie akumulacji biomasy przedstawiane jest najczęściej na trzech poziomach produkcyjności: potencjalnej, limitowanej dostępnością wody i składników pokarmowych oraz osiągalnej (redukowanej przez obecność chwastów, chorób i szkodników). Modelowanie dostarcza wielu cennych informacji służących właściwej interpretacji i lepszemu zrozumieniu badanego procesu. Uzyskana w ten sposób wiedza może służyć do przeprowadzania za pomocą modeli tzw. eksperymentów symulacyjnych, co może mieć szczególne znaczenie w badaniach związanych z ochroną środowiska rolniczego (np. przemieszczanie się i przemiany pestycydów, biogenów lub metali ciężkich w glebie).
Źródło:
Ecological Chemistry and Engineering. A; 2010, 17, 12; 1580-1584
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of descriptive models to forecasting seasonal time series with gaps
Autorzy:
Oesterreich, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/424807.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
forecasting of missing data
descriptive models
systematic gap
Opis:
In this paper were presented the results of the application of quasi-simulation methods to analysis the impact of the occurrence of systematic gaps on the accuracy of inter and extrapolative forecasts for time series with seasonal fluctuations. Forecasts were built on the basis of predictors based on descriptive models with seasonally changing parameters. Theoretical considerations will be illustrated by the empirical example. The models estimation and construction of inter- and extrapolative forecasts were done with R and Statistica 10.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2015, 1 (47); 68-77
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of extension of abilities of text models’ semantic analysis
Autorzy:
Korostil, Y.
Korostil, O.
Powiązania:
https://bibliotekanauki.pl/articles/360253.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
models
interpretation
semantic parameters
extension
semantic dictionaries
Opis:
Methods of extension of abilities of semantic analysis of text models by introduction of additional semantic parameters, which come out of basic semantic parameters are researched. The structural components of models are reviewed and they are a base on which methods of extension of abilities of of text models analysis are researched. Basing on use of structural components of text models external semantic parameters are introduced, which also extend abilities of analysis of those models.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 90-96
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Volatility Persistence and Predictability of Squared Returns in GARCH(1,1) Models
Autorzy:
Triacca, Umberto
Powiązania:
https://bibliotekanauki.pl/articles/483247.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GARCH Models
returns
time series
volatility persistence
Opis:
Volatility persistence is a stylized statistical property of financial time-series data such as exchange rates and stock returns. The purpose of this letter is to investigate the relationship between volatility persistence and predictability of squared returns.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2009, 1, 3; 285-291
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective F tests for sub-normal models
Autorzy:
Nunes, Célia
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729820.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
ective F tests
sub-normal models
max-min tests
orderings
Opis:
F tests that are specially powerful for selected alternatives are built for sub-normal models. In these models the observation vector is the sum of a vector that stands for what is measured with a normal error vector, both vectors being independent. The results now presented generalize the treatment given by Dias (1994) for normal fixed-effects models, and consider the testing of hypothesis on the ordering of mean values and components.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2003, 23, 2; 167-174
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele biokinetyczne ASM
Biokinetic models ASM
Autorzy:
Sadecka, Z.
Płuciennik-Koropczuk, E.
Sieciechowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/372474.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modele ASM
frakcje ChZT
ASM models
COD fractions
Opis:
W pracy przedstawiono ogólną charakterystykę modeli biokinetycznych typu ASM. W modelach uwzględnia się frakcje zanieczyszczeń biodegradowalnych i niebiodegradowalnych oraz rozpuszczonych i zawartych w zawiesinie. Podano charakterystykę frakcji ChZT oraz zakładane w modelach stężenia poszczególnych frakcji i ich procentowe udziały w ChZT całkowitym.
The paper presents the general characteristics of biokinetic models type ASM. The models take into account of the biodegradable and nonbiodegradable fraction soluble and contained in the suspension. In the article the characteristics of COD fractions and the concentrations of individual fractions and their percentage of the total COD is given.
Źródło:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2011, 141 (21); 113-125
1895-7323
Pojawia się w:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Multiplicity of Citizenship Models and the Future Vision of the Citizen
Autorzy:
Durzewska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/699330.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
cultural studies
patterns of culture
citizenship models
Opis:
The study aims at the concept of culture in the context of cultural patterns which, in the process of the formation of culture, determine the ways of thinking, behavior and activities of each member of a culture. In the author’s opinion, these patterns may lead to the formation of various cultural patterns which frequently contradict one another, and finally to the strangeness which results from the different ideological assumptions within each culture. Such a concept of cultural patterns provides a new approach for studying culture, the creations and manifestations of culture and, last but not least, the functioning of the members of a culture. Contemporary concepts of the citizen usually focus on the liberal model of a civil society and to a lesser degree on communitarianism, while the other concepts are lean towards the cosmopolitan vision of the citizen of the world.
Źródło:
Journal of Applied Cultural Studies; 2016, 2
2392-0661
Pojawia się w:
Journal of Applied Cultural Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrations of discrete-continuous models of low structures with a nonlinear soft spring
Autorzy:
Pielorz, A.
Powiązania:
https://bibliotekanauki.pl/articles/280645.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear dynamics
discrete-continuous models
waves
Opis:
In the paper discrete-continuous models with a local nonlinearity are proposed for the dynamic investigations of low structures subject to kinematic excitations caused by transverse waves. The models consist of rigid bodies and of elastic elements which only undergo shear deformations, while the local nonlinearity is represented by a damper and a nonlinear spring. It is assumed that the nonlinear characteristic of the spring is of a soft type. In the paper this characteristic is described by four nonlinear functions. In the discussion a wave approach is used. Numerical calculations are performed for the models with two, three and four rigid bodies for a harmonic kinematic excitation. They focus on the investigation of the effect of the local nonlinearity expressed by various functions on displacements of selected cross-sections of the elastic elements in the considered models, and on the determination of the application ranges of these functions.
Drgania dyskretno-ciągłych modeli niskich konstrukcji ze sprężyną o nieliniowej charakterystyce typu miękiego. W pracy przeprowadzono badania dynamiczne niskich obiektów poddanych wymuszeniom kinematycznym wywołanych falami poprzecznymi przy wykorzystaniu dyskretno-ciągłych modeli z lokalną nieliniowością. Modele złożone są z brył sztywnych i elementów sprężystych poddanych tylko odkształceniom ścinającym, natomiast lokalna nieliniowość reprezentowana jest przez dyskretne elementy z nieliniową sprężyną. Założono, że nieliniowa charakterystyka sprężyny jest typu miękkiego. W pracy charakterystykę tę opisano za pomocą czterech funkcji nieliniowych. W dyskusji wykorzystano podejście falowe. Obliczena numeryczne wykonano dla modeli z dwiema, trzema i czterema bryłami sztywnymi przy wymuszeniu kinematycznym opisanym funkcją harmoniczną. Koncentrują się one na zbadaniu wpływu lokalnej nieliniowości, wyrażonej przez cztery różne funkcje, na przemieszczenia wybranych przekrojów poprzecznych elementów sprężystych w rozpatrywanych modelach, oraz na wyznaczeniu obszarów stosowalności przyjętych funkcji nieliniowych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2001, 39, 1; 153-174
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metodologiczne podstawy projektowania modeli dojrzałości
Methodological basis of maturity models designing
Autorzy:
Głuszek, Ewa
Kacała, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/419834.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
maturity
maturity models
EFQM design principles
Opis:
Maturity models are a kind of compendium of knowledge from a given field and a guide for managers translating knowledge into concrete actions which aim is to change and improve an organization. They describe the evolutionary development path which enables an organization to move from the state of inconsistent, short-term business actions to the arranged, monitored and managed ones. The article presents and compares two procedures of maturity models designing and design principles, that is criteria which a maturity model should correspond to as a result of designing, helping potential users in comparing and assessing of existing models. The aim of the article is the assessment of EFQM excellence model as to meeting the criteria of usefulness and application included in design priniples. EFQM excellence model is an example of a well designed prescriptive model which sufficiently covers the most important usefulness criteria.
Źródło:
Nauki o Zarządzaniu; 2015, 2(23); 26-42
2080-6000
Pojawia się w:
Nauki o Zarządzaniu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloud Computing – Architecture, Platform and Security Issues: A Survey
Autorzy:
Alam, Md. Sakib Bin
Powiązania:
https://bibliotekanauki.pl/articles/1178291.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cloud Computing
Deployment Models
Security Issues
Service Models
Opis:
Cloud computing system delivers computing resources as a service over the network. During the last few years clod computing technology has gained attention due to its autonomous and cost effective services. It is responsible for the growth of IT industry. But cloud computing has various security challenges that hinder the rapid adoption of this computing paradigm. Efficient steps should be taken to make cloud computing more secure and reliable. This paper works on overview of clod computing as well as related security issues.
Źródło:
World Scientific News; 2017, 86, 3; 253-264
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
E-service quality assessment according to hierarchical service quality models
Autorzy:
Ingaldi, Manuela
Powiązania:
https://bibliotekanauki.pl/articles/27315546.pdf
Data publikacji:
2022
Wydawca:
STE GROUP
Tematy:
e-commerce
e-service quality
service quality models
IPA
Opis:
E-commerce is becoming more and more popular. The COVID-19 pandemic made its development even faster. Currently, an enterprise that does not provide its services via the Internet is suffering heavy losses. Online shopping is largely different from traditional purchases, so their assessment should be made on the basis of different criteria. The aim of the paper was to assess the quality of services provided by the selected e-shop, in terms of its commercial services. The first stage of the research was the analysis of the literature in terms of hierarchical models of e-service quality, which in their structure indicate the areas of assessment. This allowed for the construction of the author’s hierarchical model of e-services and for making a list of attributes that were used in further research. On the example of the clothing e-shop, an analysis of the provided services was made, taking into account the opinions of its customers. The Importance Performance Analysis (IPA) was selected as the basis for conducting the survey research and analyzing its results, which facilitates the commenting of the obtained results. The research allowed to indicate the strengths and weaknesses of the examined e-shop, but also to identify areas requiring improvement in order to increase the quality of the offered services, as well as the customers satisfaction.
Źródło:
Management Systems in Production Engineering; 2022, 4 (30); 311--318
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multicountry and Regional Macroeconometric Models
Autorzy:
Welfe, Władysław
Powiązania:
https://bibliotekanauki.pl/articles/632771.pdf
Data publikacji:
2012-12-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Opis:
Multicountry models were developed in the previous century to serve the analyses and projections of the world economy and/or its regions (for instance Latin America). They distinguish the largest countries and the rest of the world (ROW) composed of particular countries. Hence, their structure is based on the specifications of equations for individual countries using full statistical information available at the countries level. The regional macroeconomic models are built for either administrative or geographical units distinguished within large countries (USA, China, Russia). Their structure should be in principle similar to those of the national economy. However, the statistical information of the regional economies is typically uncomplete: no sufficient information is available on exports and imports of the region, migrations and financial flows. Appropriate approximations are necessary. As in majority of countries the prices and wages movements are in general unified over the country, the variables representing the national level excerpt an impact on the regional variables. The regional impact on the national variables is rather unusual. The paper shows the skeleton model applied in the multicountry models and the skeleton of the macroeconomic regional model. The specific properties of the regional model are discussed and the possibilities of its extensions analysed.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2012, 15, 4; 293-304
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized Gaudin models and Riccatians
Autorzy:
Ushveridze, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1358828.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
The systems of differential equations whose solutions exactly coincide with Bethe ansatz solutions for generalized Gaudin models are constructed. These equations are called the generalized spectral $(^1)$ Riccati equations, because the simplest equation of this class has a standard Riccatian form. The general form of these equations is $R_{n_i}[z_1(λ),..., z_r(λ)] = c_{n_i}(λ)$, i=1,..., r, where $R_{n_i}$ denote some homogeneous polynomials of degrees $n_i$ constructed from functional variables $z_i(λ)$ and their derivatives. It is assumed that $deg ∂^{k} z_i(λ) = k+1$. The problem is to find all functions $z_i(λ)$ and $c_{n_i}(λ)$ satisfying the above equations under 2r additional constraints $P z_i(λ)=F_i(λ)$ and $(1-P)c_{n_i}(λ)=0$, where P is a projector from the space of all rational functions onto the space of rational functions having their singularities at a priori} given points. It turns out that this problem has solutions only for very special polynomials $R_{n_i}$. Simplest polynomials of such sort are called Riccatians}. One of most important results of the paper is the observation that there exist one-to-one correspondence between the systems of Riccatians and simple Lie algebras. In particular, the degrees of Riccatians associated with a given simple Lie algebra $_r$ of rank r coincide with the orders of corresponding Casimir invariants. In the paper we present an explicit form of Riccatians associated with algebras $A_1, A_2, B_2, G_2, A_3, B_3, C_3$. Another important result is that functions $c_{n_i}(λ)$ satisfying the system of generalized Riccati equations constructed from Riccatians of the type $_r$ exactly coincide with eigenvalues of the Gaudin spectral problem associated with algebra $_r$. This result suggests that the generalized Gaudin models admit a total separation of variables. $(1)$ The exact meaning of the adjective "spectral" will be clarified in subsection 1.1. Here we only note that the class of ordinary spectral Riccati equations contains, for example, the delinearized version of Lame equation.
Źródło:
Banach Center Publications; 1996, 37, 1; 259-288
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models in Survey Sampling
Autorzy:
Särndal, Carl-Erik
Powiązania:
https://bibliotekanauki.pl/articles/465913.pdf
Data publikacji:
2010
Wydawca:
Główny Urząd Statystyczny
Opis:
Models, especially in the form of assumed relationships between study variables and auxiliary variables, have influenced survey sampling theory and practice over the last four decades. Some of the early debates between the design-based school and the model-based school are revisited. In their pure forms, they offer two fundamentally different outlooks and approaches to inference in sample surveys. Complete reconciliation and agreement cannot be expected. But the tendency today is that each of the two approaches recognizes and profits from important elements in the other. We see an often fruitful interaction, as discussed in this article.
Źródło:
Statistics in Transition new series; 2010, 11, 3; 112-127
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
More on locally atomic models
Autorzy:
Newelski, Ludomir
Powiązania:
https://bibliotekanauki.pl/articles/1215420.pdf
Data publikacji:
1990
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1990, 136, 1; 21-26
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of synergistic models
Autorzy:
Abian, A.
Powiązania:
https://bibliotekanauki.pl/articles/746941.pdf
Data publikacji:
1972
Wydawca:
Polskie Towarzystwo Matematyczne
Opis:
The article contains no abstract
Źródło:
Commentationes Mathematicae; 1972, 16, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 4744

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