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Tytuł:
Sum-α Stopping Criterion for Turbo Decoding
Autorzy:
Ouardi, Aissa
Powiązania:
https://bibliotekanauki.pl/articles/1844500.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stopping criterion
correct frames
sum-α criterion
cross-entropy
turbo decoding
Opis:
In this article, we propose a new stopping criterion for turbo codes. This criterion is based on the behaviour of the probabilistic values alpha 'α' calculated in the forward recursion during turbo decoding. We called this criterion Sum-α. The simulation results show that the Bit Error Rates BER are very close to those of the Cross-Entropy CE criterion with the same average number of iterations.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 477-482
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Definicje przedmiotu teoretycznego
Autorzy:
Seidler, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/437089.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie. Instytut Filozofii i Socjologii
Tematy:
existence
realism
observation
criterion
Opis:
The paper presents three main definitions of theoretical entity: basic definition, definition from unobservability, and ontological definition. These are the definitions of theoretical entity that are most popular and widely accepted by philosophers of science (both realists and antirealists). All these definitions contain significant defects, which lead to unacceptable conclusions. The author also offers an alternative definition from explanation, which avoids the defects of previous definitions. The aim of the paper is to prove that proper definition of theoretical entity is necessary in debates over scientific realism. To make a legitimate claim about the existence of theoretical entities, one should know what theoretical entity really is.
Źródło:
ARGUMENT: Biannual Philosophical Journal; 2014, 4, 2; 375-390
2083-6635
2084-1043
Pojawia się w:
ARGUMENT: Biannual Philosophical Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new OSS design based on parameter sensitivity to changes in measurements
Autorzy:
Kalicka, R.
Bochen, D.
Powiązania:
https://bibliotekanauki.pl/articles/969953.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal sampling schedule
sensitivity criterion
Opis:
As a result of the severe practical and ethical constraints imposed on medical measurements, the parameter estimation procedure designed for diagnosis and therapy is often a difficult problem. When blood sampling provides the data, the number of samples and the observation interval should be minimized. Designing an experiment for parameter estimation requires a step known as quantitative experiment design, usually preceded by a step called qualitative experiment design. The latter answers if a model is identifiable under particular experimental conditions. The former is suitable for the purpose of obtaining the maximum information from the data to be collected. An experiment design is based on the optimization of a suitable criterion formulated with respect to the analyzed variables of the experiment (input shape, sampling schedule). This paper considers sampling schedule design. New criteria for new optimal sampling schedules (OSS) have been formulated on the basis of sensitivity function. These are referred to as S-OSS and RS-OSS designs. The results of optimization for both criteria are compared with the result obtained with a reputable established D-optimal design based on the Fisher information matrix. By showing the results of S-OSS and RS-OSS design we can present the reliability and efficiency of the new criteria in comparison to D-OSS design. Illustrative examples are presented.
Źródło:
Control and Cybernetics; 2006, 35, 2; 385-406
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition-based evolutionary computing in multicriteria optimization environment
Rachunek ewolucyjny w obszarze wielokryterialnej optymalizacji oparty na zagadnieniu dekompozycji
Autorzy:
Ryoo, J.
Hajela, P.
Powiązania:
https://bibliotekanauki.pl/articles/281943.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
multi-criterion optimization
decomposition-based design
Opis:
The paper presents strategies for implementing decomposition based genetic algorithms in multicriteria design optimization. The decomposition approach requires that the system design problem be partitioned into smaller sized subsystems, and the system solution obtained as a combination of the solutions from the subsystems. The absence of gradient information in a genetic algorithm based search strategy requires alternative methods for communicating the design information in different subsystems. Two newly developed methods referred to as experiental inheritance and interspecies migration were used to coordinate the solutions of subsystems in the decomposition based approach. Both the weighted sum and weighted minimax methods were explored in the solution to the multicriteria design problem. The proposed strategies were validated through implementation in representative algebraic and structural design problems.
W pracy zaprezentowano metodę zastosowania genetycznych algorytmów opartych na zagadnieniu wielokryterialnej optymalizacji obiektu. Zagadnienie dekompozycji wymaga rozbicia danego zadania na mniejsze podproblemy i znalezienia cząstkowych rozwiązań, by w efekcie otrzymać rozwiązanie ogólne na podstawie wcześniej wyznaczonych cząstkowych. Brak gradientowego charakteru informacji w metodzie poszukiwania rozwiązania opartej na algorytmie genetycznym skłania do zastosowania alternatywnej metody przekazu informacji pomiędzy obszarami rozbitych grup problemowych. W zagadnieniu dekompozycji użyto dwie nowosformułowane metody określone mianem dziedziczenia eksperymentalnego i migracji międzygatunkowej. W poszukiwaniu rozwiązania zadania wielokryterialnej optymalizacji obiektu wykorzystano metody sumy ważonej i wartości min-max. Zaproponowane strategie postępowania zweryfikowano na reprezentatywnych modelach algebraicznych i projektowych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 3; 609-628
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problemy navigacionnoj bezopasnosti moreplavania v ponatiah i kriteriah
Problems of Navigational Safety in Concepts and Criteria
Autorzy:
Lushnikov, E.
Powiązania:
https://bibliotekanauki.pl/articles/359068.pdf
Data publikacji:
2006
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
criterion
safety
navigation
EXPLO-SHIP 2006
Opis:
The article deals with problems of ship's navigational safety, difficulties existing in attempts to formalize the automation of navigation. Criteria of ship's navigational safety existing today are considered, as well as errors related with these issues. The author also takes into consideration the problems to be solved, and expresses a need for the perfection of such important documents as COLREG-72, Accuracy Standard for navigation and others.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2006, 11 (83); 171-180
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Thermal Stresses and Strains Developing During the Heat Treatment of Windmill Shaft
Autorzy:
Cebo-Rudnicka, A.
Malinowski, Z.
Telejko, T.
Powiązania:
https://bibliotekanauki.pl/articles/354018.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stresses
fracture criterion
finite element method
Opis:
In the paper the results of evaluation of the temperature and stress fields during four cycles of the heat treatment process of the windmill shaft has been presented. The temperature field has been calculated from the solution to the heat conduction equation over the whole heat treatment cycles of the windmill shaft. To calculate the stress field an incremental method has been used. The relations between stresses and strains have been described by Prandtl-Reuss equation for the elastic-plastic body. In order to determine the changes in the temperature and stress fields during heat treatment of the windmill shaft self-developed software utilizing the Finite Element Method has been used. This software can also be used to calculate temperature changes and stress field in ingots and other axially symmetric products. In the mathematical model of heating and cooling of the shaft maximum values of the strains have been determined, which allowed to avoid the crack formation. The critical values of strains have been determined by using modified Rice and Tracy criterion.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 459-471
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The No-Spoiler Condition for Choice Correspondences
Autorzy:
Lahiri, Somdeb
Powiązania:
https://bibliotekanauki.pl/articles/578528.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Kryterium Pareto
Choice correspondence
Pareto criterion
Opis:
We show that any choice correspondence which satisfies the weak Pareto criterion and the Majority property must violate the no-spoiler condition. Subsequently we strengthen the weak Pareto criterion. We show that if the number of criteria or individuals or states of nature is odd, then there is no choice correspondence which satisfies this strengthened version of weak Pareto criteria, Majority property and no-loser spoiler condition. However if the number of criteria/individuals/states of nature is even, we need two more properties to ensure the impossibility result. The first of these two properties is top neutrality. The second property is top anonymity.
Źródło:
Multiple Criteria Decision Making; 2019, 14; 60-74
2084-1531
Pojawia się w:
Multiple Criteria Decision Making
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody pomiaru i oceny autotermiczności wytłaczarki ślimakowo-tarczowej
Methods for measurement and evaluation of screw-disk extruder autothermity
Autorzy:
Michalska-Pożoga, I.
Rydzkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/156922.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wytłaczarka ślimakowo-tarczowa
kryterium elementarne
kryterium kompleksowe
autotermiczność
screw-disc extruder
elementary criterion
comprehensive criterion
autothermity
Opis:
W artykule przedstawione zostały metody oceny autotermiczności wytłaczarki ślimakowo-tarczowej. Jednym z zagadnień jest określenie kryterium elementarnego i kompleksowego oceny autotermiczności wytłaczarki ślimakowo-tarczowej, a drugim określenie przestrzeni, w której występuje autotermiczność, a także określenie jej wpływu na uplastycznianie i jednorodność tworzywa w strefie tarczowej wytłaczarki ślimakowo-tarczowej.
The paper deals with methods for measurement and evaluation of autothermity of an innovative, experimental, autothermal screw-disk extruder used for processing polymer materials [1, 2, 3, 4, 5, 6, 7, 8, 9] (Figs. 1, 2). One of the problems presented in the paper concerns determination of the elementary criteria for evaluation of the screw-disk extrude autothermity, namely thermal stability - St ε {0, 2, 4, 6, 8} (Fig. 3) and the quality of extrudate - Jw ε {I, II, III}, where Jw = I means good quality of extrudate, Jw = II means nearly good quality of fusion and homogenization of extrudate and Jw = III means poor fusion of extrudate (Fig. 4), and also the complex criterion for evaluation of autothermity, that provides a general state of autothermity - Ja ε {0, 2, 4, 6, 8}. The second problem is deter-mining the space in which the autothermity occurs (Fig. 5), as well as its influence on plasticization and homogeneity of material in a disk zone of a screw-disk extruder [10, 11, 12, 13, 14]. The above elementary and complex criteria make it possible for the quality of the extrusion autothermity in a screw-disk extruder to be expressed comprehensively, whereas the nature of the spaces obtained allows an influence of individual factors on achieving the autothermal effect of extrusion in a screw-disk extruder to be analysed.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 487-490
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ewolucja metod wartościowania stanowisk pracy w ujęciu literaturowym
Evolution of job evaluation methods in literature aspect
Autorzy:
Olek, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/419933.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
job evaluation
summary methods of evaluation
analytical methods of evaluation
synthetic criterion
analytical criterion
competence evaluation
Opis:
The theme of the article is a synthetic presentation of various methods of job evaluation and showing the direction of changes in defining value of work positions. Human capital as the most important resource of the organization should be organized in the best way and rewarded in the most efficient way. The changing nature of the work content forces managers to adapt the techniques and methods’ evaluation to changing working conditions. The first part of the paper characterizes methods and techniques of job evaluation. The second part presents trends in constructing new methods, which are useful for modern businesses.
Źródło:
Nauki o Zarządzaniu; 2015, 4 (25); 78-90
2080-6000
Pojawia się w:
Nauki o Zarządzaniu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonzero-sum semi-Markov games with countable state spaces
Autorzy:
Połowczuk, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1208131.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
discounted criterion
Nash equilibrium
countable state space
nonzero-sum semi-Markov game
long run average reward criterion
Opis:
We consider nonzero-sum semi-Markov games with a countable state space and compact metric action spaces. We assume that the payoff, mean holding time and transition probability functions are continuous on the action spaces. The main results concern the existence of Nash equilibria for nonzero-sum discounted semi-Markov games and a class of ergodic semi-Markov games with the expected average payoff criterion.
Źródło:
Applicationes Mathematicae; 2000, 27, 4; 395-402
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence analysis of criteria of comparables’ selection on the accuracy of the property value estimation
Autorzy:
Zyga, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1396886.pdf
Data publikacji:
2020
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
similarity assessment criterion
property valuation
LS estimation
Opis:
The subject of the considerations presented in the article is the question of the criteria according to which the comparables, in the market value estimating process, should be selected. As the most important in the selection of comparative properties, the factor of similarity in relation to the subject property (measured by the Euclidean distance) was considered. As the key issue, the similarity assessment criterion and the influence of the adopted critical value of this criterion on the accuracy of estimates were chosen. The analysis of the above was carried out with taking into account the role of the significance of independent variables (measured by their correlation with the vector of the dependent variable). The results of the simulation tests carried out in the variants set by the criteria adopted were presented. On this basis, it has been shown that there is a potential most relevant solution in the collection of obtainable estimation results. This solution corresponds with the smallest sum of the differences of model prices (accepted as known) and corresponding estimates. The found minimum occurs for a specific layout of the above criterion values only.
Źródło:
Reports on Geodesy and Geoinformatics; 2020, 109; 9-15
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of Stochastic Dominance in Financial Analysis
Analiza efektywności dominacji stochastycznych w zastosowaniach finansowych
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/905072.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
asymmetric distribution
stochastic dominance criterion
efficient set
Opis:
Analiza portfelowa stawia problem wyboru najlepszego spośród możliwych losowych projektów inwestycyjnych. Wybór len zależy od, jedynej dla każdego inwestora, funkcji użyteczności oraz od rozkładu prawdopodobieństwa rozważanej inwestycji. W niniejszym opracowaniu skoncentrowano się na scharakteryzowaniu zbioru optymalnych efektywnych inwestycji. W odróżnieniu od zbioru efektywnych inwestycji zgodnego z kryterium momentów MV, zbiór efektywnych inwestycji zgodny z kryterium SD jest optymalny dla całych ogólnych klas funkcji użyteczności (nie tylko dla funkcji kwadratowej). Dodatkowo kryterium SD wykorzystuje wszystkie wartości rozkładu prawdopodobieństwa projektu inwestycyjnego. Wiele prac empirycznych omawia zależności pomiędzy zbiorem efektywnych inwestycji z kryterium momentów MV a zbiorem efektywnych inwestycji zgodnym z kryterium SD. W tym artykule przedstawione zostały wyniki analiz wybranych typów rozkładów asymetrycznych.
I ortfolio analysis can be regarded as a problem of choosing the best investment project from all possible investments. I his choice depends on, the unique for each investor, utility function and the distribution оf the return оГ the investment project. Unlike MV criterion, SD criterion is optimal for a class of utility function and additionally we elaborate with all value of the return of the investment project. We will present the results of analysis the properties ol the optimal efficient set according SD criteria for asymmetric distribution.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2005, 194
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE EFFECTS OF ONLINE WRITING EVALUATION PROGRAM ON WRITING CAPACITES OF KOREAN STUDENTS
Autorzy:
Shim, Yae Jie
Powiązania:
https://bibliotekanauki.pl/articles/941172.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
Criterion
automated error-correction program
writing instruction
Opis:
The error-correction program Criterion provides students with an immediate essay feedback using tools that can analyze and review writing automatically. This feedback covers grammar, usage, mechanics, style, organization, and development. With its diagnostic tools for scoring essays and offering relevant feedback, the error-correction program provides a way to speed up the otherwise time-consuming process of essay composition and evaluation. The usefulness of the error-correction program is highlighted by analyzing the extent to which it helps second language learners improve their writing abilities, with a focus on the degree of student improvement caused by the program’s prompts from the first draft to the final essay submission. The purpose of this study is to determine the extent to which second language learners can improve their writing capacities using a specific set of online instruction materials, the error-correction program online essay writing tool in a group of 96 university students at the intermediate level of English.
Źródło:
Teaching English with Technology; 2013, 13, 3; 18-34
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective shaping of a stepped sandwich beam with clamped ends
Autorzy:
Magnucki, Krzysztof
Kustosz, Joanna
Goliwąs, Damian
Powiązania:
https://bibliotekanauki.pl/articles/2204628.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
analytical modelling
bending
shaping criterion
FEM calculations
Opis:
The aim of this work is to propose a sandwich beam with stepped layer thickness in three parts along its length. The total depth, width of the cross-section and its mass are constant. The beam is under a uniformly distributed load. The system of two equilibrium equa-tions was formulated for each part based on the literature. This system was analytically solved for the successive parts of the beam and the functions of the shear effect and deflection were determined in them. The effective stepped layer thicknesses was determined on the basis of the adopted criterion for minimizing the maximum deflection of the beam. The example calculations were made for two elected beams. The effective shapes of these beams are shown in the figures. Moreover, FEM numerical calculations of the deflections of these beams are performed.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 2; 200--204
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doctrina multiplex, veritas una
Autorzy:
Łukowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/686168.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
truth
model
possible worlds
criterion of truth
Opis:
Coherent thoughts about the truth seem to be more difficult than about any other abstract concepts. According to some fundamental presuppositions, the truth should be one and in a sense unchangeable. On the other hand, even a simple observation suggests something opposite – the truth seems to be variable and relative and that is why given in some different, alternative forms. The paper deals with all the above mentioned problems and other relative ones concerning the truth. The entire discussion coincides with an ancient dictum being the title of the article
Źródło:
Acta Universitatis Lodziensis. Folia Iuridica; 2014, 73
0208-6069
2450-2782
Pojawia się w:
Acta Universitatis Lodziensis. Folia Iuridica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of multi-criteria optimisation in marina planning on the Montenegrin coast
Autorzy:
Tomovic, S.
Sekulic, G.
Powiązania:
https://bibliotekanauki.pl/articles/258634.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marina location
multicriteria optimization
criterion functions
ecology
Opis:
Development of nautical tourism in Montenegro, seen as a potentially profitable industry segment has started twenty years ago. The first steps taken in this direction were defining the legal framework, in particular: Law on Coastal Zone, Tourism Master Plan of Montenegro, Law on Yachts, followed by establishment of supporting organizations - Maritime Safety Department of Montenegro, Port Authorities and Border Police Department. Having invested efforts in adoption of planning documents and enactment of legislation relating to nautical tourism in recent period, Montenegro is seeking to impose itself as an important nautical destination. The first serious step towards achieving this goal was construction of a world-class marina Porto Montenegro in Tivat in 2010. The Special Purpose Spatial Plan for Coastal Zone provides for development of network of marinas to be constructed on the Montenegrin Coast. In the light of this, contribution of this paper is reflected in application of multi-criteria optimization in defining an optimum order of marina construction. The paper defines selection of criterion functions from the aspects of ecology, economy, security, specific aspect and aspect of suitability assessment for the location. The paper also presents the process of defining different criterion weights. The multi-criteria analysis determines a compromise solution for marina planning at Montenegrin Coast, which reconciles conflicting interests. The compromise solution is only a proposal, while a final decision remains with a decision maker.
Źródło:
Polish Maritime Research; 2014, 2; 86-90
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the relevant parameters on small scale of navigable abnormal ship model
Autorzy:
Cai, C.
Lei, P.
Cai, X.
Powiązania:
https://bibliotekanauki.pl/articles/259654.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic model
similarity criterion
abnormal ship model
Opis:
At present, ship model tests are based on the normal mode at home and abroad. With the development and application of abnormal hydraulic model, it is necessary to study abnormal ship model. The similarity criterion of abnormal ship model is deduced from the similarity theory of normal hydraulic model in this paper. Some factors that affect the maneuverability of the abnormal ship model are discussed by theoretical analysis of ship maneuvering. The influence of the K and T index of different variable rate on the abnormal ship model maneuvering and the dimensional effect of the abnormal ship model are obtained, which can be used as a reference for the study of the abnormal ship model.
Źródło:
Polish Maritime Research; 2017, S 2; 133-139
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
About robust detection of a breakdown point in selected linear regression models
O odpornym wykrywaniu punktu zmiany tendencji w wybranych modelach regresji liniowej
Autorzy:
Kosiorowski, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/907040.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
change-point
regression depth
schwarz information criterion
Opis:
In this paper an approach appealing to a regression depth concept is applied to a robust detection of points (moments) of a regression coefficients change. The propositions are compared with propositions based on Schwarz information criterion and discussed in the context of linear mixed models.
W referacie przedstawiamy pewne propozycje dotyczące odpornego wykrywania punktu (chwili), w którym następuje zmiana współczynników regresji liniowej. Propozycje odwołują się do koncepcji głębi regresyjnej przedstawionej przez Rousseeuw i Hubert (1998). Własności proponowanego podejścia porównujemy z podejściem wykorzystującym kryterium informacyjne Schwarza oraz dyskutujemy je w kontekście liniowych modeli mieszanych.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feature selection based on linear separability and a CPL criterion function
Autorzy:
Bobrowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1965821.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
linear separability
feature selection
CPL criterion function
Opis:
Linear separability of data sets is one of the basic concepts in the theory of neural networks and pattern recognition. Data sets are often linearly separable because of their high dimensionality. Such is the case of genomic data, in which a small number of cases is represented in a space with extremely high dimensionality. An evaluation of linear separability of two data sets can be combined with feature selection and carried out through minimisation of a convex and piecewise-linear (CPL) criterion function. The perceptron criterion function belongs to the CPL family. The basis exchange algorithms allow us to find minimal values of CPL functions efficiently, even in the case of large, multidimensional data sets.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 2; 183-192
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of the Ductile Failure Criterion for Nickel-Based Superalloys taking into Account the Localization of the Strain
Autorzy:
Madejski, B.
Socha, G.
Powiązania:
https://bibliotekanauki.pl/articles/97929.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
equivalent plastic strain
tensile test
failure criterion
Opis:
Static tension test allows characterization of material strength properties. This simple test provides input data for numerical calculation of structural components made of the tested alloy. Elastic, plastic and failure behavior of the structural component in question is simulated, using, for example, the FEM package, based on parameters obtained as the result of tensile testing. When using the results of the tensile test for modeling the material failure it is important to estimate correctly plastic strain corresponding to failure. It is common practice to use elongation of the specimen gage part for the calculation of failure strain. On the other side, the most popular ductile failure criterion used by engineers performing numerical simulation of the material’s behavior relies on the equivalent plastic strain as the criterial quantity. Those two parameters can differ significantly. In order to calculate the equivalent plastic strain correctly, we have to remember about strain localization (necking) appearing during tensile tests and take into account the fact that during tensile testing we have three non-zero strain tensor components. Ignoring this fact, and using only elongation as the criterial quantity can lead to enormous simulation error. This error is analyzed in this paper for nickel based superalloy tested at elevated temperatures.
Źródło:
Fatigue of Aircraft Structures; 2017, 9; 27-37
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Stability Interval of the Set of Linear System
Autorzy:
Mazakov, Talgat
Wójcik, Waldemar
Jomartova, Sholpan
Karymsakova, Nurgul
Ziyatbekova, Gulzat
Tursynbai, Aisulu
Powiązania:
https://bibliotekanauki.pl/articles/1844628.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automatic control system
stability
matrix
minor
characteristic polynomial
Hurwitz criterion
Lienard-Shipard criterion of interval mathematics
Lyapunov function
Opis:
The article considers the problem of stability of interval-defined linear systems based on the Hurwitz and LienardShipar interval criteria. Krylov, Leverier, and Leverier-Danilevsky algorithms are implemented for automated construction and analysis of the interval characteristic polynomial. The interval mathematics library was used while developing the software. The stability of the dynamic system described by linear ordinary differential equations is determined and based on the properties of the eigenvalues of the interval characteristic polynomial. On the basis of numerical calculations, the authors compare several methods of constructing the characteristic polynomial. The developed software that implements the introduced interval arithmetic operations can be used in the study of dynamic properties of automatic control systems, energy, economic and other non-linear systems.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 2; 155-161
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure criterion for brick masonry: a micro-mechanics approach
Autorzy:
Kawa, M.
Powiązania:
https://bibliotekanauki.pl/articles/178604.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
strength anisotropy
micromechanics
masonry microstructure
masonry
failure criterion
Opis:
The paper deals with the formulation of failure criterion for an in-plane loaded masonry. Using micro-mechanics approach the strength estimation for masonry microstructure with constituents obeying the Drucker–Prager criterion is determined numerically. The procedure invokes lower bound analysis: for assumed stress fields constructed within masonry periodic cell critical load is obtained as a solution of constrained optimization problem. The analysis is carried out for many different loading conditions at different orientations of bed joints. The performance of the approach is verified against solutions obtained for corresponding layered and block microstructures, which provides the upper and lower strength bounds for masonry microstructure, respectively. Subsequently, a phenomenological anisotropic strength criterion for masonry microstructure is proposed. The criterion has a form of conjunction of Jaeger critical plane condition and Tsai-Wu criterion. The model proposed is identified based on the fitting of numerical results obtained from the microstructural analysis. Identified criterion is then verified against results obtained for different loading orientations. It appears that strength of masonry microstructure can be satisfactorily described by the criterion proposed.
Źródło:
Studia Geotechnica et Mechanica; 2014, 36, 3; 37-48
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mercy as the Basis for Solving the Social Dispute About Justice
Autorzy:
Sienkiewicz, Edward
Powiązania:
https://bibliotekanauki.pl/articles/2039162.pdf
Data publikacji:
2016
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
mercy
justice
social dispute
anthropological and personalist criterion
Opis:
The social dispute over justice that is in a great crisis, must not be limited to social and economical criteria only. This is proved by the elementary experience, since attempts to overcome injustice only on this level are not effective. The anthropological and personalist criterion is necessary here. Only this criterion allows one to integrally define a man – also in his relations with others – as a person. Also justice has a personalist character, and because of this it is not a value that is only added to a man. As such, it is also an objective value that has an obligatory character, which is difficult to justify, and the more so to make it come true, without the Christian Revelation. The event of Jesus Christ, with the preparation given in the Old Testament, shows man’s sin as the fundamental source of injustice. This is why in an encounter with injustice only God’s mercy is effective, as the only factor – through Jesus’ paschal mystery – that overcomes sin. It is not tantamount to giving up justice, but to practicing it – as in Jesus’ understanding surrendering to the criteria of justice is a necessary condition of mercy, so that the sin can be judged and overcome, and the man can be saved.
Źródło:
Roczniki Teologiczne; 2016, 63, 2 English Version; 85-100
2353-7272
Pojawia się w:
Roczniki Teologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New approach to trophic state assessment of running waters in Poland
Autorzy:
Neverova-Dziopak, E.
Kowalewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/108528.pdf
Data publikacji:
2013
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
eutrophication
biotic balance
trophic state assessment
integral criterion
Opis:
The problem of eutrophication has, since the 1970s, reached a global scale and become a problem of principal importance due to its negative consequences, which could result in the total loss of biospheric functions of aquatic ecosystems, and also their economic role. The increasing intensity of eutrophication processes and their specificity in various types of waters requires the development of special methods of control and protection of aquatic ecosystems. As a result of the high dynamism of eutrophication and its dependence on different factors (hydrological, hydrodynamic, hydrobiological, morphological, edaphic and climatic conditions), the assessment of trophic status in order to control and manage this process is very complicated. The evaluation of the consequences of anthropogenic eutrophication and the scale of its development can be provided only on the basis of systematic observation during a multi-annual period. Careful analysis of the state of knowledge on the issues related to eutrophication, especially the methods of trophic status assessment, have allowed us to conclude that at present there is no universal methodology for the assessment of the surface water trophic level, while the existing methods have various shortcomings, which reduce the reliability of the results and complicate the development of appropriate technical, organizational and legal protection measures. A critical analysis of trophic status assessment approaches for different categories of waters has also allowed us to state that there is no an appropriate method for the assessment of the trophic status of running waters, since almost all existing assessment methods are developed for lakes and coastal areas. This paper presents an original approach elaborated for the assessment of the trophic state of running waters based on the statistical analysis of long-term monitoring data and numerical criterion ITS, which allows for a simple and low-cost monitoring of eutrophication suitable for the solving of different application tasks in the field of surface water protection.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2013, 1, 1; 15-21
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex criterion of dimensional stability discussed on the example of piston silumins
Autorzy:
Czekaj, E.
Sobczak, J.
Saja, K.
Powiązania:
https://bibliotekanauki.pl/articles/244110.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
piston silumins
dimensional stability
complex criterion
polygon method
Opis:
The article discusses the use of a quality polygon method in complex evaluation of the dimensional stability of a newly developed AK12 E piston silumin of the Lo-Ex (Low-Expansion) type with around-eutectic silicon content. According to PN-EN 1706:2001, the reference material was standard aluminium piston alloy designated as EN AC-48000 (EN AC-AlSi12CuNiMg). It is an analogue of the well-known and commonly used in production of pistons AK12 alloy according to PN-76/H-88027, withdrawn now from use. Basing on the analysis of Polish and foreign reference literature and on the authors' own knowledge and experience, five parameters of the reversible and irreversible (permanent) dimensional changes in AK12 E and AK12 S alloys (designations adopted for standard alloys) were chosen. The obtained quantitative evaluations, referred to individual parameters, enabled the values of complex (synthetic) parameters of the dimensional stability to be finally determined. From the numerical and geometrical analysis it follows that AK12 E alloy offers the dimensional stability definitely superior to that of AK12 S, but this is on the cost of the tensile strength Rm reduced at room temperature. The obtained experimental results and computations were checked on pistons during the stand engine tests.
Źródło:
Journal of KONES; 2008, 15, 2; 41-50
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 339

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