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Wyświetlanie 1-15 z 88
Tytuł:
Assessment of reliability implementation in manufacturing enterprises
Autorzy:
Haase, F. V.
Woll, R.
Powiązania:
https://bibliotekanauki.pl/articles/407231.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability management
reliability program
reliability method
manufacturing sector
reliability capability
Opis:
Purpose: The increasing internationalization of markets make the creation of competitive advantages more difficult. Companies have to be faster, better and more economical than their competitors in order to survive. Reliable products offer the capability to develop competitive advantages. To achieve the reliability objectives, a systematic approach of reliability actions and supporting methods is necessary. The integration of reliability activities into companies with regard to company size and industry has not been quantitatively determined. Methodology: An international survey drawing upon literature was applied. Evaluations are based on descriptive and inductive statistics. Results: The empirical study reveals reasons for applying reliability management in industry, the extent of applied reliability methods and performed reliability actions to achieve reliability objectives and used reliability data. The results are differentiated according to company size and industry. Research implications: The results of this study are applicable to companies which have already dealt with reliability issues. Further studies should consider a cross-section status of reliability implementation in industry, as well as they should contain extended actions and methods of reliability. Value of paper: This research relates to the status of reliability management implementation in international industry. There are shown significant differences in industries and company size. The results show potentials in reliability management and can be used as benchmark.
Źródło:
Management and Production Engineering Review; 2016, 7, 2; 12-20
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Honesty of scientists and reliability of science. Practice
Autorzy:
Grabski, Maciej W.
Powiązania:
https://bibliotekanauki.pl/articles/703354.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
science
honesty
dishonesty
reliability
misconduct
Opis:
The changing environment of science and transformed methods of practising science are a tough test of its honesty and honour. The situation today is completely different than a few decades ago, when science was able to deal by itself with disclosed cases of dishonesty in the community. Today new discoveries require huge outlays of public money, team work, interinstitutional and multidisciplinary methods, and international co-operation. Furthermore, increasingly close interactions between politics, business and society on the one hand, and science on the other, have become a lasting element of the contemporary world, bringing with it conflicts of interest and the threat of intellectual corruption. These factors have led to pathological trends in science that are hard to control, while the problem of scientific misconduct is no longer an internal concern of the scientific community. To maintain public confidence in science and the trust science should have in itself, it is necessary to create an environment which would properly, institutionally protect and promote diligence and an attachment to compliance with high standards. This process began in the world twenty years ago, but has yet to be started in Poland. This is why the scientific community, acting in its own interest, should demand of administrators of science in Poland that they, like their counterparts in other countries which want to play a major role in science and its international partnership, undertake genuine measures aimed at introducing a system for protecting science from the pathologies and various forms of dishonesty it is plagued by. The solutions are simple, and many well-tested examples exist. Unless this succeeds, our lack of preparation for dealing with inevitably approaching events will cause us to pay a huge social price.
Źródło:
Nauka; 2009, 2
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Characteristics in the Assessment of Reliability of Machines and Devices
Autorzy:
Kopania, Gabriela
Kuczmaszewska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2023856.pdf
Data publikacji:
2021-12
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability
damage intensity function
cumulative damage
Opis:
The aim of this work is to present new reliability characteristics expressed as functions of some variable expressing the measure of effective operation of a machine or a device. These characteristics can be used for both renewable and non-renewable objects. Their mathematical idea reflects the essence of already known characteristics, i.e. it expresses the probability of failure but expressed as a function of a variable, not necessarily identified with time.
Źródło:
Management and Production Engineering Review; 2021, 14, 4; 45-52
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How good gets better and bad gets worse: measuring the face of emotion
Autorzy:
Adetoun, Bolanle E.
Tserere, Maggie M.
Adewuyi, Modupe F.
Akande, Titilola E.
Akande, Williams A.
Powiązania:
https://bibliotekanauki.pl/articles/430100.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emotional responses
DES
reliability
validity
Zulu
Opis:
Given the history of the past, black South African students from different settings face unique academic and emotional climate. Using the Differential Emotions Scale (DES) which focuses on ten discrete emotions, and building upon Boyle’s (1984) seminal work, this study reports a repeated-measure multiple discriminant function analysis for individual items across raters. The findings further indicate that majority of the DES items are sensitive indicators of the different innate and universal facial expressions. However, the construct requires revision so that it offers the examiner maximum flexibility in assessment at diverse levels, in terms of more extensive norming and programmatic replication. In brief, the DES potentially has much to offer provided that it is adequately developed for use in non-Western nations or contexts.
Źródło:
Polish Psychological Bulletin; 2010, 41, 4; 133-143
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Substation reliability evaluation in the context of the stability prediction of power grids
Autorzy:
Borecki, M.
Ciuba, M.
Kharchenko, Y.
Khanas, Y.
Powiązania:
https://bibliotekanauki.pl/articles/199826.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability
power grid
risk analysis
substation
Opis:
The aim of the presented work was to examine the reliability assessment model on the example of a selected power grid object. The analyzed object was tested based on assumptions about technological breaks that were caused by overvoltage, among others. The study was conducted to check the reliability of integral elements of the power grid object and to assess the change in reliability level as a function of the frequency of inspections. The test results are to determine the optimal frequency of inspections of individual power grid objects in order to increase its reliability. In addition, the possibility of correlating optimal inspection periods resulting from the findings of this paper with periodic inspections of power network facilities was assessed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 769-776
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shortening of psychological tests – assumptions, methods and doubts
Autorzy:
Kleka, Paweł
Paluchowski, Władysław Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2128185.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability
validity
shortening tests
abbreviated version
Opis:
In this article, on the basis of questionnaire data collected for other purposes, the Authors want to show the consequences of various methods of shortening of tests and what may result from such an action for diagnosticians, researchers and examined individuals. The research aim of the work is to show the best method of shortening of the scale of questionnaires. Will shortening of a questionnaire according to different statistical techniques bring the same results? Will the quality of shortened scales be comparable? Is any of statistical techniques better for shortening of the scale of a questionnaire? The obtained results suggest a poorly controlable effect of the methods of questionnaire shortening. Moreover creating a short version on the basis of the results collected with the use of the full version leads to obtaining a tool with unknown diagnostic and psychometric properties.
Źródło:
Polish Psychological Bulletin; 2017, 4; 516-522
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the links of internal and external reliability with the system conditionality in Gauss-Markov models with uncorrelated observations
Badanie związków między niezawodnością wewnętrzną i zewnętrzną a uwarunkowaniem układu w modelach Gaussa-Markova z nieskorelowanymi obserwacjami
Autorzy:
Prószyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/145593.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
niezawodność
system warunkowości
rozkład wartości pojedynczej
internal reliability
external reliability
system conditionality
singular value decomposition
uncorrelated observations
Opis:
The relationship between internal response-based reliability and conditionality is investigated for Gauss-Markov (GM) models with uncorrelated observations. The models with design matrices of full rank and of incomplete rank are taken into consideration. The formulas based on the Singular Value Decomposition (SVD) of the design matrix are derived which clearly indicate that the investigated concepts are independent of each other. The methods are presented of constructing for a given design matrix the matrices equivalent with respect to internal response-based reliability as well as the matrices equivalent with respect to conditionality. To analyze conditionality of GM models, in general being inconsistent systems, a substitute for condition number commonly used in numerical linear algebra is developed, called a pseudo-condition^number. Also on the basis of the SVD a formula for external reliability is proposed, being the 2-norm of a vector of parameter distortions induced by minimal detectable error in a particular observation. For systems with equal nonzero singular values of the design matrix, the formula can be expressed in terms of the index of internal response-based reliability and the pseudo-condition^number. With these measures appearing in explicit form, the formula shows, although only for the above specific systems, the character of the impact of internal response-based reliability and conditionality of the model upon its external reliability. Proofs for complementary properties concerning the pseudo-condition^number and the 2-norm of parameter distortions in systems with minimal constraints are given in the Appendices. Numerical examples are provided to illustrate the theory.
Badany jest związek między niezawodnością wewnętrzną bazującą na odpowiedziach modelu a uwarunkowaniem układu dla modeli Gaussa-Markova z obserwacjami nieskorelowanymi. Rozpatrywane są przy tym modele z macierzami projektu pełnego i niepełnego rzędu. Wzory wyprowadzone przy użyciu rozkładu macierzy ze względu na wartości szczególne (SVD) wskazują wyraźnie, że te dwa badane pojęcia są wzajemnie niezależne. Przedstawione są metody konstruowania dla danej macierzy projektu macierzy równoważnych pod względem niezawodności wewnętrznej oraz macierzy równoważnych pod względem uwarunkowania. Aby umożliwić analizę uwarunkowania modeli GM stanowiących w ogólności układy sprzeczne, wyprowadzono pseudo-wskaźnik zastępujący wskaźnik uwarunkowania układu powszechnie stosowany w numerycznej algebrze liniowej. Także na podstawie rozkładu SVD zaproponowano wzór określający niezawodność zewnętrzną bazujący na 2-giej normie wektora zniekształceń parametrów indukowanych przez minimalny wykrywalny błąd w danej obserwacji. Dla układów z jednakowymi niezerowymi wartościami szczególnymi wzór ten może być wyrażony poprzez wskaźnik niezawodności wewnętrznej oraz pseudo-wskaźnik uwarunkowania. Z tymi miarami występującymi w postaci jawnej, wzór ukazuje, chociaż jedynie dla powyższych specyficznych układów, charakter wpływu niezawodności wewnętrznej i uwarunkowania modelu na jego niezawodność zewnętrzną. Dowody uzupełniających własności dotyczących pseudo-wskaźnika uwarunkowania oraz 2-giej normy wektora zniekształceń parametrów w układach z minimalnymi ograniczeniami, zamieszczone są w Dodatkach. Teoria ilustrowana jest na przykładach numerycznych.
Źródło:
Geodesy and Cartography; 2013, 62, 2; 157-181
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can we measure working memory via the Internet? The reliability and factorial validity of an online n-back task
Autorzy:
Kulikowski, Konrad
Potasz-Kulikowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/430629.pdf
Data publikacji:
2016-04-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
n-back
working memory
online
reliability
validity
Opis:
The aim of this study was to check whether an online n-back task conducted in the uncontrolled environment of the Internet can yield valid and reliable data. For this purpose, 169 participants completed an online n-back task with n1, n2 and n3 blocks on their home computers. The results have shown acceptable reliability for overall accuracy and reaction time indices across n1, n2, n3 blocks, as well as for reaction time indices for each n block. Unacceptable reliability has been found for separate n levels accuracy indices and for response bias indices. Confirmatory factor analysis has revealed that, among 8 proposed measurement models, the best fit for the data collected is a model with two uncorrelated factors: accuracy consisting of n1, n2, n3 indices and reaction time consisting of n2, n3 indices. The results of this study have demonstrated for the first time that a reliable administration of online n-back task is possible and may therefore give rise to new opportunities for working memory research.
Źródło:
Polish Psychological Bulletin; 2016, 47, 1; 51-61
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an innovative approach for complex, causally determined failure chains
Autorzy:
Bielefeld, O.
Dransfeld, H.
Schlüter, N.
Winzer, P.
Powiązania:
https://bibliotekanauki.pl/articles/407289.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model-based failure analysis
reliability
quality
safety
Opis:
A high number of examples in today’s global industry prove that it is difficult to ensure a certain level of quality. One possible reason is the increasing complexity of modern mechatronic product systems. Interface problems due to several involved science disciplines and the lack of understanding subsystems, which are delivered by different suppliers, make it difficult to identify critical components and specifications of elements. Furthermore, it is even harder to estimate the effects of elements because of their unknown dependencies and relations. Therefore it becomes more and more improbable to develop a safe, sustainable and high quality product right from the beginning. In order to understand failures in complex system structures today’s engineering industries need a generic approach that increases the understanding of systems, identifies critical components and considers the different levels of a system. It shall examine failures that cause system errors but also failures that limit system functions. Thus, it is necessary to model and simulate the causally failure chains and analyse over several system levels and elements with their dependencies. This leads to a better understanding of the whole picture of cause and effect. This research paper points out which requirements this new model-based approach has to fulfill and how it is possible to link quality and reliability methods to achieve an overall understanding and analysis of a complex system to assure high quality and sustainability.
Źródło:
Management and Production Engineering Review; 2017, 8, 3; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Noise in Supercapacitors
Autorzy:
Szewczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/221256.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
supercapacitor
flicker noise
measurement set-up
reliability
Opis:
A developed method and measurement setup for measurement of noise generated in a supercapacitor is presented. The requirements for noise data recording are considered and correlated with working modes of supercapacitors. An example of results of low-frequency noise measurements in commercially available supercapacitors are presented. The ability of flicker noise measurements suggests that they can be used to assess quality of tested supercapacitors.
Źródło:
Metrology and Measurement Systems; 2017, 24, 4; 645-652
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of sectionalizing switch placement in medium voltage distribution networks in the aspect of improving the continuity of power supply
Autorzy:
Bąchorek, W.
Benesz, M.
Powiązania:
https://bibliotekanauki.pl/articles/201362.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability of distribution networks
sectionalizing switches
SAIDI
Opis:
The paper addresses the problem of placement of sectionalizing switches in medium voltage distribution networks. Proper placement of sectionalizing switches is one of the elements leading to higher power networks reliability. The methods of optimal allocation of such switches in a MV distribution network are presented in the paper. SAIDI was used as a criterion for the sectionalizing switches placement. For selecting optimum placements, three methods were used: brute force method, evolutionary algorithm and heuristic algorithm. The calculations were performed for a real MV network.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 459-466
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiparameter reliability model for SiC power MOSFET subjected to repetitive thermomechanical load
Autorzy:
Bąba, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2173625.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability engineering
reliability modelling
power MOSFET
SiC
silicon carbide
inżynieria niezawodności
modelowanie niezawodności
węglik krzemu
tranzystor mocy MOSFET
Opis:
The main drawback of any Design for Reliability methodology is lack of easy accessible reliability models, prepared individually for each critical component. In this paper, a reliability model for SiC power MOSFET in SOT – 227 B housing, subjected to power cycling, is presented. Discussion covers preparation of Accelerated Lifetime Test required to develop such reliability model, analysis of semiconductor degradation progress, samples post-failure analysis and identification of reliability model parameters. Such model may be further used for failure prognostics or useful lifetime estimation of High Performance Power Supplies.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137386
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiparameter reliability model for SiC power MOSFET subjected to repetitive thermomechanical load
Autorzy:
Bąba, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2090738.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability engineering
reliability modelling
power MOSFET
SiC
silicon carbide
inżynieria niezawodności
modelowanie niezawodności
węglik krzemu
tranzystor mocy MOSFET
Opis:
The main drawback of any Design for Reliability methodology is lack of easy accessible reliability models, prepared individually for each critical component. In this paper, a reliability model for SiC power MOSFET in SOT – 227 B housing, subjected to power cycling, is presented. Discussion covers preparation of Accelerated Lifetime Test required to develop such reliability model, analysis of semiconductor degradation progress, samples post-failure analysis and identification of reliability model parameters. Such model may be further used for failure prognostics or useful lifetime estimation of High Performance Power Supplies.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137386, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal for the assessment of steel truss reliability under fire conditions
Propozycja oceny niezawodności stalowej kratownicy w warunkach pożarowych
Autorzy:
Kubicka, K.
Radoń, U.
Powiązania:
https://bibliotekanauki.pl/articles/231070.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
warunki pożarowe
kratownica stalowa
niezawodność
ocena niezawodności
system szeregowy
system równoległy
analiza pożarowa
wskaźnik niezawodności
fire conditions
steel truss
reliability
reliability assessment
serial system
parallel system
fire analysis
reliability index
Opis:
The paper presents a proposal for the assessment of the reliability of steel truss (both statically determinate and indeterminate) in the persistent and accidental design situation. In the analysis, a probabilistic approach was used. The global Hasofer-Lind reliability index was employed, computed in successive time steps for the whole structure, not for individual elements. The statically determinate truss was modelled as a serial system from the reliability standpoint. For the statically indeterminate truss, kinematically admissible failure mechanisms were determined by means of the examination of the singularity of the stiffness matrix of the structure, converting the truss into a geometrically variable system. For the problem thus formulated, a serial-parallel reliability model was constructed. Monitoring the reliability index in the successive minutes of the fire makes it possible to estimate the probability of the structure failure, and to decide whether the required safety level is maintained.
Artykuł przedstawia propozycję oceny niezawodności stalowej kratownicy (statycznie wyznaczalnej i niewyznaczalnej) w podstawowej i wyjątkowej sytuacji projektowej. W analizie zastosowano podejście probabilistyczne z globalnym wskaźnikiem niezawodności Hasofera-Linda obliczanym w kolejnych krokach czasowych dla konstrukcji jako całości, a nie poszczególnych elementów. Kratownica statycznie wyznaczalna została zamodelowana jako układ szeregowy z punktu widzenia niezawodności. Dla kratownicy statycznie niewyznaczalnej poprzez badanie osobliwości macierzy sztywności konstrukcji określono kinematycznie dopuszczalne mechanizmy zniszczenia, przekształcające ją w układ geometrycznie zmienny. Dla tak postawionego zadania zbudowano szeregowo-równoległy model niezawodnościowy. Stal jest materiałem chętnie wykorzystywanym w budownictwie ze względu na szereg korzystnych właściwości, głównie mechanicznych. Niemniej jednak nie jest to materiał pozbawiony wad. Główną, najpoważniejszą jest wyjątkowo niska odporność na wysokie temperatury. Wraz ze wzrostem temperatury gazów pożarowych właściwości mechaniczne stali: granica plastyczności i moduł sprężystości ulegają redukcji co w bezpośredni sposób przekłada się na spadek nośności.
Źródło:
Archives of Civil Engineering; 2015, 61, 4; 141-154
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On adjusting the load bearing capacity of decisive members to reliability classes of statically determinate complex structures
Autorzy:
Kowal, Z.
Powiązania:
https://bibliotekanauki.pl/articles/230694.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
niezawodność
struktura złożona
element konstrukcyjny
klasa niezawodności
kwantyle
nośność
reliability
complex structure
structural member
reliability class
quantiles
load bearing capacity
Opis:
The paper provides a solution to the problem of dimensioning decisive bars on the basis of the conditions of meeting the recommended reliability classes [9] of statically determinate structures composed of n members. A theorem was formulated: if a statically determinate structure composed of n decisive members is to attain the reliability greater than, or equal to, the recommended reliability p = 1- q, it is necessary and sufficient that the damage frequency sum qi of decisive members is smaller than the admissible damage frequency q of the structure: Σqi < q. On the basis of this theorem, s coefficients that recommend increase of the load bearing capacity of the decisive bars in a statically determinate structure constructed in order to meet the recommended class [9] of the structure reliability, are estimated and presented in a tabular form.
Źródło:
Archives of Civil Engineering; 2013, 59, 1; 131-142
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 88

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