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Tytuł:
Application of the design of experiments and statistical hypothesis to reduce defects in the flange of the steel plate process
Autorzy:
Sadłowska, Hanna
Wójcik, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/29520066.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
laser cutting
flanging
fracture
statistical hypotheses
Opis:
The paper presents a discussion on the occurrence of defects in the circumferential flange of steel plate. The numerous flange face defects have been analysed. The types of defects have been selected and categorized using an experimental planning procedure involving 600 samples for 24 different process variants, considering variables such as material, hole diameter, tool size and tool position. The analysis of experimental results enabled to determine of the optimal values of process parameters to minimize the occurrence of defects. Furthermore, the influence of individual parameters on the quality of the flange surface has been carried out to obtain the process parameters’ impact using statistical hypotheses. As a result, it was possible to develop rules which will be helpful in the design process, especially important when changing the material to be processed.
Źródło:
Computer Methods in Materials Science; 2022, 22, 3; 149-156
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple test procedures and the closure principle
Procedury testów wielokrotnych i zasada domknięcia
Autorzy:
Alt, Raimund
Powiązania:
https://bibliotekanauki.pl/articles/905016.pdf
Data publikacji:
1993
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
multiple test procedures
closure principle
linear hypotheses
Opis:
In this paper we show how to apply the closure test principle in case of testing linear hypotheses within the classical regression model. The closure test principle which was introduced by (Marcus, Peritz, Gabriel (1976)) results in the construction of test procedures which are in general much more powerful then conventional test procedures like the Bonferroni procedure or the Schöffe' procedure. A small simulation study provides some evidence of the superiority of closed test procedures compared to classical test procedures.
W pracy tej pokazujemy jak stosować zasadę testu domknięcia w przypadku badania hipotez liniowych w klasycznym modelu regresji. Zasada domknięcia, wprowadzona przez [Marcusa, Peritza, Gabriela (1976)], pozwala skonstruować procedury, które zasadniczo są o wiele silniejsze niż konwencjonalne procedury testowe, np. procedura Bonferroniego czy Scheffego. Krótkie badanie symulacyjne dostarcza pewnych dowodów wyższości procedury testu wielokrotnego domkniętego nad procedurą testu klasycznego.
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:
SIGNALING HYPOTHESES OF SHARE REPURCHASE – LIFE CYCLE APPROACH. THE CASE OF POLISH LISTED COMPANIES
Autorzy:
Kazmierska-Jozwiak, Bogna
Wronska-Bukalska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/517401.pdf
Data publikacji:
2017
Wydawca:
Instytut Badań Gospodarczych
Tematy:
share repurchase
signaling hypotheses
business life cycle
Opis:
Research background: Payout policy has attracted a great deal of research, how-ever it still has not been satisfactorily explained why corporations repurchase their shares. The most popular explanation for share repurchases is their signaling power. An alternative explanation for share repurchases is related to free cash flow. We assume that both theories are not competitive, due to the fact that the motives for share repurchases may differ depending on the firm’s life cycle stage. Purpose of the article: The aim of the paper is to test the hypotheses that companies in growth stage are more prone to repurchase their shares due to the their undervaluation. Methods: Our analysis focuses on 116 repurchase on WSE and 47 repurchase on NewCon-nect in Poland during the period 2004–2016 to test the hypothesis. We assume that companies listed on WSE are in their mature stage while listed on NewConnect are in the growth stage. We use market value to book the value ratio (M/BV) and the relation of M/BV ratio for the repurchasing company to the M/BV ratio for the whole market at the date of implementing share repurchase program as a proxies for firm valuation. Findings & Value added: Our study does not confirm that repurchased companies at a growth stage are more undervalued than repurchased companies at a mature stage (at statistically significant level), however there are more repurchased companies at a growth stage with lower M/BV value than repurchase companies in mature stage. Adding corporate life cycle theory into the study, our result can contribute to the literature by more distinctly understanding the motivation of share repurchases. The results might be helpful for companies to determine their financial policies and for investors to determine their investment decisions.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2017, 12, 2; 245-257
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing hypotheses in universal models
Autorzy:
Fišerová, Eva
Powiązania:
https://bibliotekanauki.pl/articles/729680.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
universal linear model
unbiased estimator
tests hypotheses
Opis:
A linear regression model, when a design matrix has not full column rank and a covariance matrix is singular, is considered. The problem of testing hypotheses on mean value parameters is studied. Conditions when a hypothesis can be tested or when need not be tested are given. Explicit forms of test statistics based on residual sums of squares are presented.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2006, 26, 2; 127-149
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposal of a novel geometrical measure of material effort
Autorzy:
Wacławiak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/38884607.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
stress tensor
geometrical representation
material effort hypotheses
Opis:
A stress tensor may be presented as a surface delimited by a stress vector located at angles α1, α2, α3 in relation to axes x, y, z. Geometrically, it outlines a domain and is linked to the loading. In this study, the area of such a surface and the volume of the domain were determined, along with their cross-sections with reference to areas and circumferences. Different stresses were also compared. This article presents cases of uniaxial, biaxial, triaxial tension and pure shear for an isotropic solid body. The analysis of a stress tensor in this conceptual work does not involve any material features, yet yields interesting results, particularly in the case of pure shear and uniaxial tension.
Źródło:
Engineering Transactions; 2022, 70, 2; 183-199
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some remarks on permutation type tests in linear models
Autorzy:
Husková, Marie
Picek, Jan
Powiązania:
https://bibliotekanauki.pl/articles/729768.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
hypotheses testing
linear regression models
L₁- and L₂ - procedures
Opis:
The paper discusses applications of permutation arguments in testing problems in linear models. Particular attention will be paid to the application in L₁-test procedures. Theoretical results will beaccompanied by a simulation study.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2004, 24, 2; 151-181
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computing With Words and Life Data
Autorzy:
Grzegorzewski, P.
Hryniewicz, O
Powiązania:
https://bibliotekanauki.pl/articles/908012.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
computing with words
life data
vague data
estimation
hypotheses testing
Opis:
The problem of statistical inference on the mean lifetime in the presence of vague data is considered. Situations with fuzzy lifetimes and an imprecise number of failures are discussed.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 3; 337-345
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two Methods of Analysis for Huntington’s ‘Clash of Civilizations’
Autorzy:
Pasichny, A.
Powiązania:
https://bibliotekanauki.pl/articles/115743.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
clash of civilizations
hypotheses test
world model
expert survey
culture
conflict
Opis:
The paper presents two methods for civilizations’ identification developed for analysis of Samuel Huntington’s concept about the ‘clash of civilizations’ with the help of mathematical methods. General origin and formalization of the problem, theoretical structure of the methods, and the approach for further interconnection of the results with global conflict dynamics are given.
Źródło:
Challenges of Modern Technology; 2012, 3, 3; 23-25
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy analysis of the propulsion shaft fatigue process in a rotating mechanical system. Part II. Identification studies – developing the fatigue durability model of a drive shaft
Autorzy:
Korczewski, Zbigniew
Marszałkowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/260457.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
rotating mechanical system
modelling energy processes
propulsion shaft fatigue
testing statistical hypotheses
Opis:
The article presents a continuation of research carried out concerning identification of energy consequences of mechanical fatigue within a propeller shaft in a rotating mechanical system, while working under conditions of the loss of the required alignment of shaft lines. Experimental research was carried out on a physical model reflecting a full-sized real object: i.e., the propulsion system of the ship. It is proven, by means of an active experiment, that changes in propeller shaft deflection are reflected in the amount of dissipated kinetic energy of masses in rotational motion and the accumulated internal energy in its construction material. Adoption of a high-cycle fatigue syndrome, consisting of diagnostic symptoms determined from the action of the propeller shaft associated with the transformation of mechanical energy into work and heat, as well as with the generation of mechanical vibrations and elastic waves of acoustic emission, is proposed. To assess the diagnostic information quantity brought about by the defined features of propeller shaft fatigue, an experimental research program was developed and implemented, in which two statistical hypotheses are verified: the significance of the impact of the values enforcing the fatigue process, presented in the first part of the article, and the adequacy of the regression equation describing the fatigue durability of the propeller shaft in the energy aspect, constituting the second part of the article. This finally gives us the opportunity, after the appropriate translation of the model test results into full-sized real objects, to develop a methodology to diagnose marine propeller shaft fatigue in operating conditions. The third part of the article is devoted to this issue
Źródło:
Polish Maritime Research; 2020, 2; 120-124
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Concept of Research on Economic Crime in the Context of the Research Task “Optimization of Evidence, Forensic and Operational Activities in Cases of Economic Crime From the Perspective of Law Enforcement Authorities”.
Autorzy:
Porwisz, Monika
Powiązania:
https://bibliotekanauki.pl/articles/1375045.pdf
Data publikacji:
2020
Wydawca:
Wyższa Szkoła Policji w Szczytnie
Tematy:
methods
hypotheses
research problems
economic crimes
evidence
law enforcement agencies
criminal trial
Opis:
The aim of the publication is to outline the concept of research in the area of economic crime, which has been outlined on the basis of the undertaken research issues related to the implementation of the research task, entitled: “Optimization of evidence, forensic and operational activities in cases of economic crime from the perspective of law enforcement authorities”, which will allow to create an effective model for combating it. In the article, current research problems have been identified. The research project will include actions aimed at defining, designing and then determining the possibility of implementing practical tools to increase the effectiveness of law enforcement. An important research element, which is a basis for formulating specific conclusions and recommendations, will be to conduct a survey of opinions and expectations of practitioners concerning the possibilities of improving the detection process. The assumed research concept also involves diagnosing economic crimes (in terms of evidence, forensic and operational aspects). There are cases of evidence-intensive, multi-aspect cases in which the methods of action of the perpetrators constitute a challenge for law enforcement agencies in the legal or tactical aspect. Corresponding to the diagnosed research problems, several research levels have been proposed, such as causes, scale of economic crime, dynamics of crime, methods and mechanisms of committing crimes, and ways of counteracting them. As a result of in-depth research on the phenomenon of economic crime, proposals for specific solutions will be worked out, which may constitute a specific compendium of knowledge on the issues raised. The research concept covers a wide range of issues that correspond to the current challenges in combating this type of crime. A detailed description of the problems, and the research concept adopted allows us to conclude that the results of the research may be theoretically valuable and useful for science and practice. This publication constitutes a preliminarily research concept adopted within the framework of the research task INP-2/2018/P/MP funded by the Ministry of Science and Higher Education.
Źródło:
Internal Security; 2020, 12(1); 45-53
2080-5268
Pojawia się w:
Internal Security
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SELF-NARRATIVES OF BRAZILIAN DEAF PEOPLE: APPLICATION OF THE HYPOTHESES OF SOCIOANALYSES
Autorzy:
PEDROSA, CLEIDE EMILIA FAYE
Powiązania:
https://bibliotekanauki.pl/articles/1036239.pdf
Data publikacji:
2020-02-25
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
hypotheses of the socioanalysis
self-narratives
deaf applicants
Higher Education
Critical Discourse Analysis.
Opis:
The objective of the study is to apply eight hypotheses of the socioanalysis for the interpretation and critical social reading of the "self-narratives" of deaf applicants to Higher Education at the Federal University of Sergipe (UFS-Brazil). It is located in the theoretical-methodological field of Critical Discourse Analysis  (CDA), and Deaf Studies (DS). We will analyze a narrative of a deaf subject, corpus collected in 2014, in the college entrance examination for the Brazilian Sign Language Course (LIBRAS), and adopt this methodological guideline, to define object of study;  identify areas of interfaces that meet the objectives; select the categories of each area of interface; establish the dialogue between categories;  identify the social meanings constructed in the discourse. The result confirms the role of socioanalysis in seeking to unveil how the practice of social relations and (re)construction of their identities in the struggle for citizenship rights articulate in the deaf individual's life.
Źródło:
Society Register; 2020, 4, 1; 71-84
2544-5502
Pojawia się w:
Society Register
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tests of independence of normal random variables with known and unknown variance ratio
Autorzy:
Gąsiorek, Edward
Michalski, Andrzej
Zmyślony, Roman
Powiązania:
https://bibliotekanauki.pl/articles/729874.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
mixed linear models
variance components
correlation
quadratic unbiased estimation
testing hypotheses
confidence intervals
Opis:
In the paper, a new approach to construction test for independenceof two-dimensional normally distributed random vectors is given under the assumption that the ratio of the variances is known. This test is uniformly better than the t-Student test. A comparison of the power of these two tests is given. A behaviour of this test forsome ε-contamination of the original model is also shown. In the general case when the variance ratio is unknown, an adaptive test is presented. The equivalence between this test and the classical t-test for independence of normal variables is shown. Moreover, the confidence interval for correlation coefficient is given. The results follow from the unified theory of testing hypotheses both for fixed effects and variance components presented in papers [6] and [7].
Źródło:
Discussiones Mathematicae Probability and Statistics; 2000, 20, 2; 233-247
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O nowych elementach mechaniki procesu kruszenia - problem obciążeń (na przykładzie kruszarki dźwigniowej Blakea)
On new elements of mechanics of crushing process - problem of loading (based on Blake toggle crusher)
Autorzy:
Zawada, J.
Chochoł, K.
Powiązania:
https://bibliotekanauki.pl/articles/349573.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
energia kruszenia
hipotezy energetyczne kruszenia
weryfikacja eksperymentalna
crushing energy
crushing energy hypotheses
experimental verification
Opis:
Dotychczasowy opis mechaniki procesu kruszenia w kruszarkach dwurozporowych, przedstawiany w literaturze i wykorzystywany w praktyce, jest na ogół opisem przybliżonym. Obszerne badania wykonane na nowoczesnym stanowisku badawczym zweryfikowały dotychczasowe poglądy na tę mechanikę.
The available description of mechanics of crushing process in double toggle Blake crushers, presented in literature and applied in practice, in general, is an approximated description which usually needs verification. Wide experimental studies were carried out at a modern test stand including model crusher of Blake type, measuring and control-register system. The results enabled to formulate new approach to mechanics of crushing processes, mainly focused on: load distribution in working space, friction conditions in working space, crushing energy and verification of energy hypotheses, deformation of toggle mechanism components. The results obtained in the studies formulate the base for theoretical analysis of the mechanics of the process.
Źródło:
Górnictwo i Geoinżynieria; 2006, 30, 3/1; 355-363
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bootstrap methods for epistemic fuzzy data
Autorzy:
Grzegorzewski, Przemyslaw
Romaniuk, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2134054.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
bootstrap method
fuzzy data
fuzzy numbers
hypotheses testing
metoda bootstrap
dane rozmyte
testowanie hipotez
Opis:
Fuzzy numbers are often used for modeling imprecise perceptions of the real-valued observations. Such epistemic fuzzy data may cause problems in statistical reasoning and data analysis. We propose a universal nonparametric technique, called the epistemic bootstrap, which could be helpful when the existing methods do not work or do not give satisfactory results. Besides the simple epistemic bootstrap, we develop its several refinements that aim to reduce the variance in statistical inference. We also perform an extended simulation study to examine statistical properties of the approaches considered. The discussion of the results is supplemented by some hints for practical use.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 2; 285--297
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy analysis of propulsion shaft fatigue process in rotating mechanical system Part I Testing significance of influence of shaft material fatigue excitation parameters
Autorzy:
Korczewski, Z.
Marszałkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/260020.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
rotating mechanical system
modelling of energy processes
propulsion shaft fatigue
testing of statistical hypotheses
Opis:
The article discusses the problem of mathematical modelling of energy conversion processes in a rotating mechanical system for the purpose of identifying fatigue states of propulsion shafts in this system. A simplified physical model of the analysed system, constructed in an appropriate scale, has made the basis for the experimental research. The research programme took into consideration mechanical fatigue excitation of the model propulsion shaft to find the correlation between the dynamic system load generated by a bending moment and the energy state of a specified shaft segment. A physical model of the analysed process was proposed, for which the plan of static randomised block experiment was worked out. The recorded experimental results were used for statistical analysis of the significance of influence of the quantities exciting the propeller shaft fatigue process and the adequacy of the developed mathematical model describing shaft’s durability. The analysis made use of the F-Snedecor test. The article describes the general concept of the research, the constructed laboratory test rig, and the methodology of statistical inference concerning the significance of influence of input (exciting) parameters of the physical model on the recorded output parameters. The results of the performed statistical tests confirm the absence of the significance of influence of the rotational speed of the propulsion shaft on the selected types of rotating operation of the mechanical system. As a consequence, only one exciting parameter, which is the loading mass, is going to be taken into account in the functional description of fatigue life of the propulsion shaft.
Źródło:
Polish Maritime Research; 2018, S 1; 211-217
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
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