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Wyświetlanie 1-15 z 79
Tytuł:
Expert-mathematical method in analysis of economic phenomena
Metoda ekspercko-matematyczna w procesie badań ekspertów
Autorzy:
Czupryna-Nowak, A.
Powiązania:
https://bibliotekanauki.pl/articles/326578.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
expert method
mathematical method
expert
metoda ekspercka
metoda matematyczna
ekspert
Opis:
Expert methods belong to the group of heuristic methods, whose meaning plays more and more significant role in economic phenomena analysis. Data provided in such way should be characterized by good quality. The essential problem in expert research seems to be the problem of reliability of provided information, and what follows, its representativeness. In the article, the expertmathematical method was presented as a method of determining the minimum size of the group of experts, which has a direct impact on research representativeness with assistance of experts. Presentation of the method is supported with empirical example.
Metody ekspertowe należą do grupy metod heurystycznych, których znaczenie w obecnym czasie odgrywa coraz większą rolę w analizowaniu zjawisk ekonomicznych. Dostarczone w ten sposób dane powinny się charakteryzować odpowiednią jakością. Istotny w badaniach ekspertowych wydaje się problem wiarygodności dostarczonych informacji, a co się z tym wiąże – ich reprezentatywności. W artykule zaprezentowano metodę eksperckomatematyczną jako metodę określania minimalnej liczebności grupy ekspertów. Prezentacja metody została poparta przykładami empirycznymi.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2016, 96; 229-234
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical method to estimate the underground development of the clonal species
Matematyczna metoda wyznaczania przebiegu kłącza roślin klonalnych
Autorzy:
Jakubska, A.
Dudkiewicz, M.
Jankowski, P.
Sikora, R.
Powiązania:
https://bibliotekanauki.pl/articles/9841.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki
Tematy:
mathematical method
underground development
clonal species
graph theory
plant population
Źródło:
Colloquium Biometricum; 2008, 38
1896-7701
Pojawia się w:
Colloquium Biometricum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical programming method for the topology optimization of a truss-like continuum
Autorzy:
Cui, Hao
Zhou, Kemin
Powiązania:
https://bibliotekanauki.pl/articles/280187.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
topology optimization
mathematical programming method
truss-like continuum
Opis:
A mathematical programming method to optimize the distribution field of a truss-like material is presented. The densities and angles of members are optimized in two separate procedures in each iteration. An explicit sub-problem in a variable separation form is established at every iteration procedure. At each sub-problem, the stress constraint function is expanded into a trigonometric series of the member angles. According to the extreme condition, the optimal orientations of members are determined. The member densities are optimized using the method of moving asymptotes (MMA). Two examples demonstrate that the optimal truss-like structures are very close to analytic solutions.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 751-763
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczanie progów szkodliwości chwastów za pomocą metod matematycznych
Opredelenie porogov vrednosti sornyakov na osnove matematicheskikh metodov
Determination of the weed harmfulness thresholds on the basis of mathematical methods
Autorzy:
Krzymuski, J.
Rola, J.
Rola, H.
Filipiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/801117.pdf
Data publikacji:
1988
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
chwasty
szkodliwosc
zachwaszczenie
plonowanie
metody matematyczne
oznaczanie
determination
weed
mathematical method
plant field
Opis:
Понятие вредности сорняков все чаще появляется в сельскохозяйственной научной литературе. Эти пороги утке были определены эмпирически и приводятся в практических рекомендациях относительно применения гербипидов. Однако все еще отсутствует их математическая формулировка, а также уравнения для расчетов. В труде приводится метод определения порогов вредности биологической и экономической сорняков, при использовании параметров уравнения регрессии описывающего зависимость урожаев от засоренности. Представлен также порядок статистической проверки эмпирических данных, составляющих исходный материал для определения зависимости между засорением и урожаем. Формулы на исчисление порогов вредности были пополнены примерами на базе результатов опытов и примечаниями относительно их применения в оценке засоренности, а также потребностей и целесообразности борьбы с ней.
The notion of harmfulness of weeds can be encountered more and more often in the agricultural scientific literature. Even thresholds of this harmfulness have been determined empirically and quoted in practical recommendations. There is only a lack of their mathematical formulation and equations for calculation. The method of determination of the thresholds of biological and economic harmfulness of weeds using the parameters of the regression equation describing the dependence of yields on the weediness degree, is presented in the paper. Also the process of statistical verification of empirical data constituting a starting numerical material for determination of the relationship between weediness and yield is presented. Formulae for calculation of the thresholds are supplemented with examples based on the results of experiments as well as with remarks concerning their application is estimation of the weediness degree and the purposefulness of its control.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1988, 349
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of winter oilseed rape DH lines using uni- and multivariate methods of quantitative genetics and mathematical methods
Autorzy:
Szala, L.
Kaczmarek, Z.
Adamska, E.
Cegielska-Taras, E.
Powiązania:
https://bibliotekanauki.pl/articles/81281.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
winter oilseed rape
Brassica napus
doubled haploid
androgenesis
multivariate method
transgression
genetic variation
quantitative genetics
mathematical method
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of learning outcomes assessment based on fuzzy relations
Autorzy:
Mreła, A.
Sokolov, O.
Urbaniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/202119.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mathematical method
fuzzy relations
education
learning outcomes
ranking of students
metoda matematyczna
edukacja
efekty kształcenia
ranking studentów
Opis:
The paper presents the method of assessment of learning outcomes acquirement by students. The analysis is based on the results of the final matriculation exam in mathematics. For crisp and both types of fuzzy relations, cut scores (passing scores) can be defined along with the method of preparing rankings of students. The advantage of applying type 2 fuzzy relations is the lack of the necessity for experts to agree to one level (one number) of verification of learning outcomes by items created for the examination. Based on the results of the exam and experts’ knowledge, the decision support system for calculating the levels of learning outcomes acquirement, making decisions about passing the examination and preparing rankings of students, can be developed. Additionally, the rank reversal phenomenon does not burden the proposed method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 3; 527-533
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Learning software for handling the mathematical expressions
Autorzy:
Steingartner, W.
Yar-Muhamedov, I.
Powiązania:
https://bibliotekanauki.pl/articles/122524.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
abstract syntax tree
learning software
lexical analysis
mathematical method
semantics of expressions
shunting-yard algorithm
syntax analysis
abstrakcyjne drzewo składniowe
analiza leksykalna
metoda matematyczna
semantyka języka programowania
semantyka
analiza składniowa
Opis:
Educating young software engineers and IT experts is a great challenge nowadays. Still new technologies are used in a practical approach and many of them come from formal methods. To help future software experts in the understanding of formal methods grounded in semantics, learning software that illustrates and visualizes important techniques seems to be very fruitful. In this paper, we present software, which handles the arithmetic and Boolean expressions, their analysis, evaluation, drawing the syntax tree and the other techniques with the expressions. This software is devoted as a teaching tool for teachers when explaining appropriate theory and for students for self-studying and making their own experiments. Furthermore, this software is an integral part of our software package for several semantic methods.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 2; 77-91
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The CLIL Method versus Pupils’ Results in Solving Mathematical Word Probelms
Autorzy:
Binterová, H.
Petrášková, V.
Komínková, O.
Powiązania:
https://bibliotekanauki.pl/articles/2032572.pdf
Data publikacji:
2014-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
mathematical problems
elementary school
teaching method
Opis:
The study presents results of research investigations conducted in one elementary school in connection with implementation of mathematics teaching in English using the CLIL method. The aim of the presented case study was to contribute to uncovering the influence of this teaching method on the academic results of pupils in mathematics and the study outlines briefly an analysis of the pupils’ strategies used when solving word problems at elementary school level. At the same time, the paper also presents possible causes of the changes, which were identified in the pupils’ ways of solving word problems.
Źródło:
The New Educational Review; 2014, 38; 236-247
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real time computer tester for automatic voltage regulators used in marine generators
Autorzy:
Płachtyna, O.
Bastian, B.
Kutsyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/378183.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
synchronous generator
mathematical model
numerical method
real time
Opis:
This article briefly introduces the characteristics of ships' electrical power networks, and an existing system is described as an example. A mathematical model of a selected power system, including generators with a drive and its loads, is presented. The algorithm implementing the author's numerical method, named 'the average step voltages method', is described. The chosen numerical method is notable for its stability and high accuracy, even in combination with a large integration step size. Software and hardware applications of the RT AVR tester are also shown. To check the adequacy of the simulations using the implemented model, experimental measurements were carried out. The measurements, including dynamic states, obtained by the computer tester with the AVR system, as well as the physical model with the AVR system, are summarized. Possibilities for usage in the marine industry in the future are also outlined.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 85; 465-476
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of some speed parameters on the dynamics of nonlinear flexural vibrations of a drill column
Autorzy:
Pukach, P.
Kuzio, I.
Nytrebych, Z.
Powiązania:
https://bibliotekanauki.pl/articles/410646.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
nonlinear elastic properties
mathematical model
Galerkin method
Van der Pol method
resonance
Opis:
We investigate the influence of the motion of fluid flushing the cutter of a well drilling column, and the angular rotational velocity upon dynamic characteristics of its flexural vibrations. We take into account the nonlinear elastic features of column material. As a base of the research we took the Galerkin method and the Van der Pol method. Combining those two methods made possible to obtain the relations describing the main parameters of the dynamical process In both nonresonance and resonance case.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 4; 61-66
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matematicheskaja model dvizhenija vzaimodejjstvujushhikh semjan po naklonnojj vibrirujushhejj poverkhnosti i chislennye metody reshenija sistem kinematicheskikh uravnenijj
Mathematical model of motion of interactive seed on sloping vibrating surface and numeral methods of decision of systems of kinematics equalizations
Autorzy:
Lukjanenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/76448.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
seed
division
mathematical model
numerical method
equation
kinematic model
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on optimization method of flotation kinetic model based on molybdenite particle size effect
Autorzy:
Wan, He
An, Yanni
Qu, Juanping
Zhang, Chonghui
Xue, Jiwei
Wang, Sen
Bu, Xianzhong
Powiązania:
https://bibliotekanauki.pl/articles/24085892.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
particle size effect
molybdenite
mathematical model
method of correction
Opis:
Flotation kinetic models can be applied to describe the flotation process and to predict mineral recoveries. However, the size composition of the target minerals in the feed ore fluctuates considerably, resulting in insufficient accuracy with flotation kinetic models. There have been many studies that focus on the investigation of flotation kinetics with different particle sizes, while the optimization methods for flotation kinetic models based on particle size effects have not been reported. In this paper, flotation tests, optical microscope observations, and particle size analysis were used to identify the reasons for the decrease in accuracy of the flotation kinetic model due to changes in the composition of molybdenite particle size. Additionally, an optimization method for the flotation kinetic model was developed based on the particle size effect. The test results show that the accuracy of the flotation kinetic model for fixed particle size minerals is very high, but the predicted results for flotation recoveries of different particle size mineral mixtures have large deviations. The poor accuracy might be due to the autogenous carrier effect caused by the particle size composition fluctuating considerably. The optimization method for the flotation kinetic model is based on the particle size effect. The model can accurately describe the flotation process of molybdenite with different size compositions of molybdenite and predict the flotation recovery of molybdenite.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 163004
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some equations to identify the threshold value in the DEMATEL method
Autorzy:
Ebrahimi, Seyed Hossain
Powiązania:
https://bibliotekanauki.pl/articles/27315333.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
DEMATEL method
min strategy
max strategy
threshold value
mathematical model
Opis:
DEMATEL technique is a graphical representation method to deal with complex systems. The final analyzed cause and effect categorization would be fundamentally dependent on the threshold value setting. This research is intended to present some mathematical models for calculating the threshold value in the DEMATEL method. The min(max) operator has been intentionally used for considering three equations to identify the threshold value. Additionally, the proposed mathematical equations are gradually developed to gain more useful data to yield a threshold value as well. Particularly, the expert’s initial scoring for building the primary matrix would also be applied in one equation. Results show eliciting an expert’s opinions regarding the value of a threshold value determination leads to setting relatively high thresholds. But, there would be an equation which takes advantage of more data derived from the total influence matrix T. Moreover, a span of different threshold values is gained by making use of the Hamacher t-conorms operator which especially would cause better complexity management of the final total matrix T based on expert’s opinions. As a contribution to this research, threshold value determination is developed mathematically by making use of the direct data gained by the total matrix T. Besides combining data derived from total matrix T, the initial influence direct matrix given by experts, a simpler aggregating procedure and no need for statistical information compared to special Lenth’s method hints at this research’s novelty as well.
Źródło:
Operations Research and Decisions; 2023, 33, 2; 1--22
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metod kontrolja sistemy upravlenija kolesnojj mashinojj s celju obespechenija ehffektivnojj raboty
The method for wheeled machine system control to provide its effective operation
Autorzy:
Bondar, A.
Powiązania:
https://bibliotekanauki.pl/articles/76539.pdf
Data publikacji:
2016
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
control method
mobile machinery
movement speed
steering system
mathematical model
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2016, 18, 1
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of accelerated learning method to improve the ability of students mathematical representation
Autorzy:
Rika, Amelia
Wati, Susilawati
Agus, Hikmat Syaf
Riva, Lesta Ariany
Sudradjat, Supian
Subiyanto, Subiyanto
Powiązania:
https://bibliotekanauki.pl/articles/1177701.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Method of accelerated learning
Quasi Experiments
mathematical representation
purposive sampling
Opis:
One of the mathematical skills that must be possessed by students is the ability of mathematical representation, therefore the applied learning method should be able to facilitate the students to learn to represent the mathematical ability they have. The purpose of this study to determine the improvement of students' mathematical representation in mathematics learning using accelerated learning method. The research method used is Quasi Experiments with Nonequivalent (Pretest and Posttest) design of Control Group Design. The population in this study is the students of grade X in Pasundan Majalaya Senior High School by using Purposive Sampling technique. The samples involved in the study were 48 students of Pasundan Majalaya Senior High School, 24 students came from class X MIPA 1 (experimental class) and 24 students came from class X MIPA 3 (control class). The learning method is applied to the students of class X MIPA 1 is the method of accelerated learning whereas in the students of class X MIPA 3 is conventional methods. The result of mathematical representation of students 'mathematical representation shows that there is an improvement of ability for students' mathematical representation with gain value of 0.56 with middle criterion for class X MIPA 1 and 0.17 with lower criterion for class X MIPA 3.
Źródło:
World Scientific News; 2018, 101; 65-76
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 79

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