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Wyświetlanie 1-15 z 108
Tytuł:
Fuzzy global sensitivity analysis of fuzzy net present value
Autorzy:
Sari, I. D.
Kuchta, D.
Powiązania:
https://bibliotekanauki.pl/articles/206340.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
fuzzy sensitivity analysis
fuzzy net present value
Opis:
The cash flows of an investment project are influenced by several factors. All the factors influencing fuzzy net present value of a project should be taken into account, together with their variability, in order to analyze the whole project, and to make the best decisions during the project’s life. In this paper a fuzzy global sensitivity analysis method is proposed for fuzzy net present value to determine the influences of the factors on the worth of an investment project. The results of the proposed method for an application are also interpreted.
Źródło:
Control and Cybernetics; 2012, 41, 2; 481-496
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational gait analysis for post-stroke rehabilitation purposes using fuzzy numbers, fractal dimension and neural networks
Autorzy:
Prokopowicz, P.
Mikołajewski, D.
Tyburek, K.
Mikołajewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/202175.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational analysis
spatio-temporal gait parameters
fuzzy analysis
gait classification
disorder recognition
Opis:
Computational gait analysis constitutes a useful tool for quantitative assessment of gait disturbances, improving functional diagnosis, assessment of treatment planning, and monitoring of disease progress. There is little research on use of computational gait analysis in neurorehabilitation of post-stroke survivors, but current evidence on its clinical application supports a favorable cost-benefit ratio. The research was conducted among 50 adult people: 25 of them after ischemic stroke constituted the study group, and 25 healthy volunteers constituted the reference group. Study group members were treated for 2 weeks (10 neurorehabilitation sessions). Spatio-temporal gait parameters were assessed before and after therapy and compared using a novel fuzzy-based assessment tool, fractal dimension measurement and gait classification based on artificial neural networks. Measured results of rehabilitation (changes of gait parameters) were statistically relevant and reflected recovery. There is good evidence to extend its use to patients with various gait diseases undergoing neurorehabilitation. However, methodology for properly conducting and interpreting the proposed assessment and analysis procedures, providing validity and reliability of their results remains a key issue. More objective clinical reasoning, based on proposed novel tools, requires further research.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 191-198
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Relationship between Environmental Uncertainty and Enterprise Performance. A Fuzzy-Set Analysis
Autorzy:
Kwiotkowska, A.
Gębczyńska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2064981.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
environmental uncertainty
firm performance
fuzzy-set analysis
SME
Opis:
The purpose of this paper is to explore causal complexity in the relationship between environmental uncertainty and firm’s performance. Due to complexity in the external and internal environment, the relationship between environment and firm performance rests not only on a single attribute but on the interrelation and complementarities between multiple characteristics such as firm features and external factors. This study examines the influence of a firm’s specific characteristics and the dimensions of environmental uncertainty on the company’s performance. Fuzzy-set qualitative comparative analysis is used to analyze data collected via questionnaires from 58 Polish small and medium enterprises (SMEs). The results suggest that characteristics of the general business environment, as well as the firm-specific characteristics all matter to firm performance. In addition, our findings clearly demonstrate that the determination of high firm performance is underpinned by substantial interdependence among the selected conditions and complexity. Therefore, any particular condition may have a different or even opposite effect on the outcome depending on the presence or absence of other conditions. Based on this, we conclude that external environmental uncertainty characteristics, with the dimensions of competitive intensity, technological turbulence and market/demand turbulence, are not as important as the other conditions for high-performing firms. The study offers a new perspective on the relationship between environmental uncertainty and firm performance with its systematic comparative analysis of complex cases. It identifies different combinations of conditions (paths) leading to a high firm performance.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 809--816
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Special functions in fuzzy analysis
Autorzy:
Garrido, A.
Powiązania:
https://bibliotekanauki.pl/articles/255897.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
logics in A. I.
fuzzy set theory
Fuzzy Real Analysis
artificial intelligence
Opis:
In the treatment of Fuzzy Logic an useful tool appears: the membership function, with the information about the degree of completion of a condition which defines the respective Fuzzy Set or Fuzzy Relation. With their introduction, it is possible to prove some results on the foundations of Fuzzy Logic and open new ways in Fuzzy Analysis.
Źródło:
Opuscula Mathematica; 2006, 26, 3; 457-464
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paths to Explain Employee Job Satisfaction. A Fuzzy-Set Analysis
Autorzy:
Gębczyńska, M.
Kwiotkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2065019.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
job satisfaction
fuzzy-set qualitative comparative analysis
SMEs
Opis:
Job satisfaction is one of the most researched topics in management literature taking into consideration the fact that it has been found out that this concept has many practical implications in the workplace. Job satisfaction is very complex phenomenon which is influenced by numerous factors. Previous studies provide a partial view of job satisfaction, because they are usually focused on the relationship between a single factor and job satisfaction, without taking a global view to indicate how different factors simultaneously affect job satisfaction. The purpose of this paper is to investigate how different factors such as: work family balance, teamwork, personal environment fit, job security and supervisor support simultaneously influence job satisfactions. The sample of the study includes employees of Polish small and medium enterprises (SMEs). Fuzzy-set qualitative comparative analysis is used to analyze data collected in surveys from 274 employees. The results contribute to research on job satisfaction by outlining several combinations of factors which create a paths to explain employee job satisfaction: (1) teamwork and supervisor support, (2) personal environment fit, job security and supervisor support with absence of work family balance, (3) work family balance, job security and supervisor support.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 569--576
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Importance of intellectual capital resources in rural development using the fsQCA method as an example
Autorzy:
Ziemiańczyk, U.
Krakowiak-Bal, A.
Powiązania:
https://bibliotekanauki.pl/articles/101183.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
intellectual capital
rural area development
fuzzy-set Quality Comparative Analysis
fsQCA
Opis:
The aim of this paper is to present the context of intellectual capital in rural area development using the example of fuzzy qualitative comparative analysis (fsQCA), which is one of the few methodological innovations of recent decades and which bridges the gap between quantitative and qualitative research. Based on surveys and interviews with local organizations, the study examined the relationships between the results of work and the composition of variables that constitute intellectual capital components. The results, related to intellectual capital, were divided into three variables representing human capital (education, experience-years of work, language skills), structural capital (presence of IT system in an organization, the number of procedures and processes) and relational capital (the number of cooperating organizations, the number of NGOs in the community, the level of trust in the manager). The research outcomes showed that different combinations of intellectual capital components led in practice to the same result; nevertheless, human capital was an indispensable element of the combination.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, IV/3; 1799-1810
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A practical application of kernel-based fuzzy discriminant analysis
Autorzy:
Gao, J. Q.
Fan, L. Y.
Li, L.
Xu, L. Z.
Powiązania:
https://bibliotekanauki.pl/articles/908344.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza dyskryminacyjna
algorytm najbliższego sąsiada
SVD
kernel fuzzy discriminant analysis
fuzzy k-nearest neighbor
QR decomposition
singular value decomposition (SVD)
fuzzy membership matrix
t-test
Opis:
A novel method for feature extraction and recognition called Kernel Fuzzy Discriminant Analysis (KFDA) is proposed in this paper to deal with recognition problems, e.g., for images. The KFDA method is obtained by combining the advantages of fuzzy methods and a kernel trick. Based on the orthogonal-triangular decomposition of a matrix and Singular Value Decomposition (SVD), two different variants, KFDA/QR and KFDA/SVD, of KFDA are obtained. In the proposed method, the membership degree is incorporated into the definition of between-class and within-class scatter matrices to get fuzzy between-class and within-class scatter matrices. The membership degree is obtained by combining the measures of features of samples data. In addition, the effects of employing different measures is investigated from a pure mathematical point of view, and the t-test statistical method is used for comparing the robustness of the learning algorithm. Experimental results on ORL and FERET face databases show that KFDA/QR and KFDA/SVD are more effective and feasible than Fuzzy Discriminant Analysis (FDA) and Kernel Discriminant Analysis (KDA) in terms of the mean correct recognition rate.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 4; 887-903
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy modelling of temperature difference in 200 MW power unit condenser using genetic fuzzy systems
Autorzy:
Pająk, M.
Powiązania:
https://bibliotekanauki.pl/articles/970605.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
learning
fuzzy models
genetic algorithms
fuzzy statistics and data analysis
large-scale systems
linguistic modelling
Opis:
Energy generation is one of the most complicated industrial processes. Because of its complexity, there is no accurate conventional model of a power unit. Fuzzy logic concepts might be effectively implemented in this field. In the paper a universal method of creating a fuzzy logic model is presented. To check the usefulness of the method in the case of real industrial issues, a fuzzy model of temperature difference in a condenser was automatically generated. The modelling experiment and the assessment of model quality are presented in the paper.
Źródło:
Control and Cybernetics; 2008, 37, 3; 565-583
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing the Validity of the Travel and Tourism Competitiveness Index in the World Economic Forum with Classical and Fuzzy Data Envelopment Analyses
Autorzy:
Ozkoc, Hatice
Bakan, Hakan
Baldemir, Ercan
Powiązania:
https://bibliotekanauki.pl/articles/529679.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Turystyki i Rekreacji
Tematy:
Travel & Tourism Competitiveness Index
Data Envelopment Analysis
Fuzzy Data Envelopment Analysis
Mediterranean Sea
World Economic Forum
Validity
Opis:
Tourism revenue is an extremely important source of income in terms of countries. At this point, each country competes with other countries in its selected field. The Travel and Tourism Competitiveness Index (TTCI) is an indicator which reveals who is better, and this index constitutes the order of countries. In this study focuses on the competitive ranking alternative to the Tourism Competitiveness Index (TTCI). Fuzzy Data Envelopment Analysis (FDEA) was used for this purpose.
Źródło:
Problemy Turystyki i Rekreacji; 2013, 4; 121-128
2084-5154
Pojawia się w:
Problemy Turystyki i Rekreacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the parameters affecting the water pipelines on the mining terrains with a use of an adaptive fuzzy system
Estymacja czynników ryzyka dla sieci wodociągowej znajdującej się na terenach górniczych przy wykorzystaniu neuronowych systemów rozmytych
Autorzy:
Malinowska, A.
Hejmanowski, R.
Rusek, J.
Powiązania:
https://bibliotekanauki.pl/articles/219731.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
szkoda górnicza
teren górniczy
sieć wodociągowa
ciągłe deformacje powierzchni terenu
rozmyta klasteryzacja
mining damage
mining terrain
water supply
subsidence
fuzzy cluster analysis
Opis:
The research presented in this paper is basically focused on two objectives. Firstly, the selection of parameters affecting the water supply network damage. The causes of failures were selected from a population of tens of breakdown cases and then classified in view of their importance. Secondly, attention was paid to the selection of the most suitable linguistic model which could be commonly used for selecting factors which generate failures. Finally a Mamdani-based model could be worked out as a system possessing best generalization qualities. This model can create bases for an adaptative decision system which can show the type of water supply-sewage network, depending on continuous surface strains due to the mining activity.
Badania zaprezentowane w artykule miały dwa zasadnicze cele. Pierwszym z nich była selekcja czynników wpływających na awarie sieci wodociągowej zlokalizowanej na terenie górniczym. Analizując czynniki wyselekcjonowane z populacji kilkudziesięciu przypadków awarii, dokonano ich klasyfikacji pod względem istotności. Drugim celem był wybór najbardziej odpowiedniego modelu lingwistycznego, który mógłby być powszechnie stosowany dla celów selekcji czynników wywołujących awarie. Ostatecznie badania pozwoliły na wyłonienie modelu bazującego na wnioskowaniu według reguły Mamdani jako systemu cechującego się najlepszymi własnościami generalizacyjnymi. Model ten może być podstawą decyzyjnego systemu adaptacyjnego pozwalającego na wskazanie typu uszkodzeń sieci wodno-kanalizacyjnej w zależności od ciągłych deformacji powierzchni terenu wynikających z eksploatacji górniczej.
Źródło:
Archives of Mining Sciences; 2016, 61, 1; 183-197
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring agility of indian automotive small & medium sized enterprises (SMEs)
Autorzy:
Tiwari, Rupesh Kumar
Tiwari, Jeetendra Kumar
Powiązania:
https://bibliotekanauki.pl/articles/407171.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
exploratory factor analysis
multiple regression analysis
fuzzy logic
fuzzy integrated index
FII
fuzzy performance index
FPII
fuzzy ranking
Opis:
Indian SMEs are going to play pivotal role in transforming Indian economy and achieving double digit growth rate in near future. Performance of Indian SMEs is vital in making India as a most preferred manufacturing destination worldwide under India’s “Make in India Policy”. Current research was based on Indian automotive SMEs. Indian automotive SMEs must develop significant agile capability in order to remain competitive in highly uncertain global environment. One of the objectives of the research was to find various enablers of agility through literature survey. Thereafter questionnaire administered exploratory factor analysis was performed to extract various factors of agility relevant in Indian automotive SMEs environment. Multiple regression analysis was applied to assess the relative importance of these extracted factors. “Responsiveness” was the most important factor followed by “Ability to reconfigure”, “Ability to collaborate”, and “Competency”. Thereafter fuzzy logic bases algorithm was applied to assess the current level of agility of Indian automotive SMEs. It was found as “Slightly Agile”, which was the deviation from the targeted level of agility. Fuzzy ranking methodology facilitated the identification & criticalities of various barriers to agility, so that necessary measures can be taken to improve the current agility level of Indian automotive SMEs. The current research may helpful in finding; key enablers of agility, assessing the level of agility, and ranking of the various enablers of agility to point out the weak zone of agility so that subsequent corrective action may be taken in any industrial environment similar to India automotive SMEs.
Źródło:
Management and Production Engineering Review; 2019, 10, 1; 58-67
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent soft computing methods in software reliability engineering
Autorzy:
Albeanu, G.
Duda, G.
Powiązania:
https://bibliotekanauki.pl/articles/2069529.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
fuzzy sets
intuitionistic fuzzy sets
intuitionistic fuzzy numbers
subjective data analysis
Opis:
This paper presents recent approaches in soft computing to manage imprecision and uncertainty which appear in software reliability engineering. Firstly, recent approaches like imprecise probabilities, generalized intervals, fuzzy sets and intuitionistic-fuzzy sets are shortly described, and the usage of intuitionistic fuzzy numbers for system reliability computation is shown. Intuitionistic-fuzzy approaches for software reliability growth models are proposed and experimental results are given.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 1--10
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On wavelet based enhancing possibilities of fuzzy classification methods
Autorzy:
Lilik, Ferenc
Solecki, Levente
Sziová, Brigita
Kóczy, László T.
Nagy, Szilvia
Powiązania:
https://bibliotekanauki.pl/articles/384751.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
fuzzy classification
wavelet analysis
fuzzy rule interpolation
structural entropy
Opis:
If the antecedents of a fuzzy classification method are derived from pictures or measured data, it might have too many dimensions to handle. A classification scheme based on such data has to apply a careful selection or processing of the measured results: either a sampling, re‐ sampling is necessary. or the usage of functions, transfor‐ mations that reduce the long, high dimensional observed data vector or matrix into a single point or to a low num‐ ber of points. Wavelet analysis can be useful in such cases in two ways. As the number of resulting points of the wavelet ana‐ lysis is approximately half at each filters, a consecutive application of wavelet transform can compress the me‐ asurement data, thus reducing the dimensionality of the signal, i.e., the antecedent. An SHDSL telecommunication line evaluation is used to demonstrate this type of appli‐ cability, wavelets help in this case to overcome the pro‐ blem of a one dimensional signal sampling. In the case of using statistical functions, like mean, variance, gradient, edge density, Shannon or Rényi en‐ tropies for the extraction of the information from a pic‐ ture or a measured data set, and they don not produce enough information for performing the classification well enough, one or two consecutive steps of wavelet analy‐ sis and applying the same functions for the thus resulting data can extend the number of antecedents, and can dis‐ till such parameters that were invisible for these functi‐ ons in the original data set. We give two examples, two fuzzy classification schemes to show the improvement caused by wavelet analysis: a measured surface of a com‐ bustion engine cylinder and a colonoscopy picture. In the case of the first example the wear degree is to be deter‐ mine, in the case of the second one, the roundish polyp content of the picture. In the first case the applied statisti‐ cal functions are Rényi entropy differences, the structural entropies, in the second case mean, standard deviation, Canny filtered edge density, gradients and the entropies. In all the examples stabilized KH rule interpolation was used to treat sparse rulebases.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 32-41
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity analysis of a fuzzy expert system for modelling dependencies in human operators’ emergency tasks
Autorzy:
Zio, E.
Baraldi, P.
Librizzi, M.
Podofillini, L.
Dang, H. V.
Powiązania:
https://bibliotekanauki.pl/articles/2069589.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
human reliability analysis
fuzzy expert system
sensitivity analysis
Opis:
This paper analyzes the behaviour of a fuzzy expert system for evaluating the dependence among successive operator actions, through a sensitivity analysis on the fuzzy input partitioning and assessment. Preliminary results are presented with respect to a case study concerning two successive tasks of an emergency procedure in a nuclear reactor. Work is in progress to perform a thorough sensitivity analysis to generalize the results obtained.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 2; 379--389
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leadership and project success in project–based organization. a fuzzy–set analysis
Autorzy:
Gębczyńska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/323435.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
leadership
project-based organization
fuzzy-set Qualitative Comparative Analysis
fsQCA
przywództwo
organizacja oparta na projekcie
jakościowa analiza porównawcza
Opis:
This study analyzes the impact of leadership style characteristics such as idealized influence-charisma, inspirational motivation, individualized consideration, intellectual stimulation, contingent reward and management by exception on project success in project9 based organizations. This paper argues that these factors simultaneously, in different configurations, affect project success. The data for the empirical analysis come from a survey 11 of 17 cases – Polish consultancies. This study employs a configurational approach, using fuzzy set Qualitative Comparative Analysis (fs/QCA), to assess the different combinations of mentioned factors.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2019, 138; 41-57
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 108

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