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Wyświetlanie 1-25 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
Wyświetlanie 1-25 z 4744

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