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Wyświetlanie 1-15 z 54
Tytuł:
Hybrid correlated data in risk assessment
Autorzy:
Rębiasz, B.
Powiązania:
https://bibliotekanauki.pl/articles/406391.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
risk
interactive fuzzy numbers
random fuzzy numbers
simulation
Opis:
A method for evaluating the risks in a situation has been presented where parameters in the calculation are expressed in the form of dependent fuzzy numbers and probability distributions. The procedure of risk estimation combines stochastic simulation with the execution of arithmetic operations on interactive fuzzy numbers. In order to define operations on such numbers, non-linear programming is used. Relations between the parameters presented in the form of fuzzy numbers and probability distributions are expressed by means of interval regression. The results of computations indicate that the relations between parameters have a significant impact on the ratios characterizing risk.
Źródło:
Operations Research and Decisions; 2015, 25, 1; 81-101
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A modified ranking approach for solving fuzzy critical path problems with LR flat fuzzy numbers
Autorzy:
Kaur, P.
Kumar, A.
Powiązania:
https://bibliotekanauki.pl/articles/206258.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
fuzzy critical path problems
ranking function
LR fuzzy numbers
LR flat fuzzy numbers
Opis:
There are several fuzzy critical path methods for solving fuzzy critical path problems in which ranking approaches are used for comparing fuzzy numbers. In this paper, it is shown that if the existing ranking approaches are used for solving such fuzzy critical path problems in which duration times of activities are represented by LR flat fuzzy numbers, then more than one fuzzy numbers, representing the fuzzy project completion time, are ob- tained and a new ranking approach for comparing LR flat fuzzy numbers is proposed. Also, it is proved that if the proposed rank- ing approach is used for solving fuzzy critical path problems then a unique fuzzy number, representing the fuzzy project completion time, is obtained.
Źródło:
Control and Cybernetics; 2012, 41, 1; 171-190
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of two kinds of fuzzy arithmetic, LR and OFN, applied to fuzzy observation of the cofferdam water level
Autorzy:
Czerniak, J. M.
Dobrosielski, W.
Angryk, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/305703.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
fuzzy logic
fuzzy number
ordered fuzzy numbers
Opis:
This paper presents certain important aspect soft he fuzzy logic extension, one of whichis OFN. It includes basic definition soft hat discipline. It also compares fuzzy logic arithmetic with the arithmetic of ordered fuzzy numbers in L-R notation. Computational experiments were based on fuzzy observation of the impounding basin. The results of the study show that there is a connection between the order of OFN number and trend of changes in the environment. The experiment was carried out using computer soft ware developed specially for that purpose.When comparing the arithmetic of fuzzy numbers in L-R notation with the arithmetic of ordered fuzzy number son the ground soft he experiment, it has been concluded that with fuzzy numbers it ispossible to expand the scope of solutions in comparison to fuzzy numbers inclassic form. The symbol of OFN flexibility is the possibility to determine the number that always satisfies the equation A+X=C, regardles soft hevalue of arguments. Operations performed on OFN are less complicated, as the yare performed in the same way regard less the sign of the input data and the irresults are more accuratein the majority of cases.The promising feature of ordered fuzzy numbers is their lack of rapidly growing fuzziness. Authors expect to see implication of that fact in practice in the near future.
Źródło:
Computer Science; 2013, 14 (3); 443-457
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Center of circles intersection, a new defuzzification method for fuzzy numbers
Autorzy:
Zarzycki, H.
Dobrosielski, W. T.
Apiecionek, Ł.
Vince, T.
Powiązania:
https://bibliotekanauki.pl/articles/200363.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
defuzzification
fuzzy logic
ordered fuzzy numbers
Opis:
The article introduces a new proposal of a def uzzification method, which can be implemented in fuzzy controllers. The first chapter refers to the origin of fuzzy sets. Next, a modern development based on this theory is presented in the form of ordered fuzzy numbers (OFN). The most important characteristics of ordered fuzzy numbers are also presented. In the following chapter, details about the defuzzification process are given as part of the fuzzy controller model. Then a new method of defuzzification is presented. The method is named center of circles intersection (CCI). The authors compare this method with a similar geometric solution: triangular expanding (TE) and geometric mean (GM). Also, the results are compared with other methods such as center of gravity (COG), first of maxima (FOM) and last of maxima (LOM). The analysis shows that the proposed solution works correctly and provides results for traditional fuzzy numbers as well as directed fuzzy numbers. The last chapter contains a summary, in which more detailed conclusions are provided and further directions of research are indicated.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 185-190
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving Systems of Linear Equations under Conditions of Uncertainty on the Example of the Leontief Model
Autorzy:
Kacprzak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1356874.pdf
Data publikacji:
2019-09-11
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
Tematy:
Systems of linear equations
interval arithmetic
fuzzy numbers
ordered fuzzy numbers
Leontief model
Opis:
The paper presents various methods of solving systems of linear equations under conditions of uncertainty. In a situation when the parameters of such systems cannot be precisely determined with real numbers, they can be represented by interval numbers, fuzzy numbers or ordered fuzzy numbers. Solutions of systems of linear equations with such representations of parameters are shown in the example of Leontief input-output model. It has also been shown that when ordered fuzzy numbers are applied, their additional feature – orientation – can broaden and deepen economic analysis.
Źródło:
Central European Economic Journal; 2018, 5, 52; 244 - 259
2543-6821
Pojawia się w:
Central European Economic Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The sensitivity of the SERVQUAL score to the choice of the fuzzy conversion scale
Wrażliwość wskaźnika SERVQUAL na wybór rozmytej skali konwersji
Autorzy:
Jefmański, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/424756.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
fuzzy sets
fuzzy numbers
fuzzy scales
fuzzy SERVQUAL
Opis:
The Fuzzy SERVQUAL method enables to assess the service quality when the measurement results of the performance perception and expectations are expressed in the form of fuzzy numbers. The measurement results expressed in the form of fuzzy numbers are the results of applying the fuzzy conversion scales which are the most popular form of fuzzy scales. Fuzzy conversion scales assume that their points are expressed in the form of fuzzy numbers. The choice of fuzzy number parameters which describe the various points of measurement scales is most often subjective. The aim of the article is to assess the impact of the choice of the fuzzy conversion scale on the stability of the assessment results of the ser-vice quality using the fuzzy SERVQUAL method. The stability assessment was made both for the individual dimensions and the overall SERVQUAL score. The results of employee satisfaction surveys of the West Pomeranian Province local government were used for the purpose of the assessment. The results suggest that there is no significant impact of the form of fuzzy conversion scales on the stability of the assessment results of the service quality us-ing the fuzzy SERVQUAL method.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2017, 3 (57); 59-71
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzziness and probability for portfolio management
Autorzy:
Walaszek-Babiszewska, A.
Mendecki, W.
Powiązania:
https://bibliotekanauki.pl/articles/118067.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
portfolio of assets
fuzzy numbers
optimization
Opis:
In the paper the portfolio of financial assets has been formulated using the fuzzy numbers idea and the statistical information concerning assets. The optimization task of the portfolio structure has been formulated for two types of fuzzy numbers. The data from Polish ma rket have been used for exemplary calculations.
Źródło:
Applied Computer Science; 2006, 2, 2; 93-104
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An evolutionary algorithm determining a defuzzyfication functional
Autorzy:
Kosiński, W.
Markowska-Kaczmar, U.
Powiązania:
https://bibliotekanauki.pl/articles/1943273.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
ordered fuzzy numbers
defuzzyfication
genetic algorithm
Opis:
Order fuzzy numbers are defined that make it possible to deal with fuzzy inputs quantitatively, exactly in the same way as with real numbers, together with four algebraic operations. An approximation formula is given for a defuzzyfication functional that plays the main role when dealing with fuzzy controllers and fuzzy inference systems. A dedicated evolutionary algorithm is presented in order to determine the form of a functional when a training set is given. The form of a genotype composed of three types of chromosomes and the fitness function are given and Genetic operators are proposed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 1-2; 47-58
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FUZZY NUMBERS IN VALUATION OF REAL INVESTMENT PROFITABILITY
Autorzy:
Górski, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/599566.pdf
Data publikacji:
2014-06-05
Wydawca:
Wyższa Szkoła Informatyki i Zarządzania z siedzibą w Rzeszowie
Tematy:
real investment profitability
fuzzy numbers
Certainty Equivalent
Opis:
In response to the weakness of traditional efficiency assessment methods taking risk into account, the modification of the Certainty Equivalent method is proposed in this paper. The possibility of connecting solutions from different fields provides for the elaboration of a more effective tool to illustrate and indicate the accurate level of risk in the investment efficiency calculus, which is the matter under consideration in the paper. The authors propose to use the modified method of a Certainty Equivalent that is based on fuzzy numbers. The aim of the method is to make decisions that are less incorrect. The work should be treated as an introduction to proposed further research on the subject.
Źródło:
Finansowy Kwartalnik Internetowy e-Finanse; 2014, 10, 1; 17-26
1734-039X
Pojawia się w:
Finansowy Kwartalnik Internetowy e-Finanse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On portfolio analysis using oriented fuzzy numbers for the trade-related sector of the Warsaw Stock Exchange
Autorzy:
Łyczkowska-Hanćkowiak, Anna
Wójcicka-Wójtowicz, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/29432380.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
oriented fuzzy numbers
recommendation
portfolio analysis
imprecision
fuzzy discount factor
Opis:
Oriented fuzzy numbers are useful in portfolio management since they convey information regarding uncertainty and imprecision when considering financial markets. One may apply a fuzzy discount factor and an imprecise present value in the form of a trapezoidal oriented fuzzy number. An investor can obtain recommendations on individual stocks (buy, sell, accumulate, reduce). Analogous recommendations are also issued by experts. In such cases, recommendations are mostly based on available data and expert’s knowledge and experience. The purpose of the paper is to present a procedure for comparing the accuracy of both types of recommendations. Also, the real impact the recommendations have on potential changes in portfolio composition in trading-related industries is considered. The research uses quotations from companies from the trading sector of the Warsaw Stock Exchange (WSE). Theoretical considerations are presented in the form of an empirical case study.
Źródło:
Operations Research and Decisions; 2023, 33, 4; 155--170
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On fuzzy number calculus
Autorzy:
Kosiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/908466.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
liczba rozmyta
wariacja ograniczona
fuzzy numbers
bounded variation
Opis:
Some generalizations of the concept of ordered fuzzy numbers (OFN) are defined to handle fuzzy inputs in a quantitative way, exactly as real numbers are handled. Additional two structures, an algebraic one and a normed (topological) one, are introduced to allow for counting with a more general type of membership relations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 1; 51-57
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model for optimizing enterprise’s inventory costs : a fuzzy approach
Autorzy:
Kosiński, W
Muniak, R.
Kosiński, W. K.
Powiązania:
https://bibliotekanauki.pl/articles/406354.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
economic order quantity
optimization problem
ordered fuzzy numbers
Opis:
Applicability of a fuzzy approach to a problem originating from administrative accounting, namely to determine an economic order quantity (EOQ) in a variable competitive environment with imprecise and vague data, has been presented. For this purpose, the model of ordered fuzzy numbers developed by the first author and his two co-workers is used. The present approach generalizes the one developed within the framework of convex fuzzy numbers and stays outside the probabilistic one.
Źródło:
Operations Research and Decisions; 2013, 23, 4; 39-54
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
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:
Determination of optimal current in the non-ideal one-phase system with unsteady parameters
Autorzy:
Dębowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/200279.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy numbers
optimisation
minimisation of power losses
optimal current
Opis:
Some of parameters in electrical systems cannot be considered as constants. In particular, some electrical loads should be described as unsteady because of physical reasons, e.g. arc and arc-resistance furnaces. One of the method to describe parameters of such loads is description by fuzzy numbers. Moreover, this description enables to determine optimal current of the system with unsteady parameters by an application of the optimisation technique called as fuzzy mathematical programming. The optimisation problem has been presented for one-phase system with sinusoidal waveforms. The obtained solution (optimal current) can be determined as crisp one (real numbers) in frequency domain in the numerical way. The determined optimal current has minimal RMS value in this case when the power constraints do not have to be fulfilled strictly because of changes of system parameters. It means simultaneously the minimisation of power losses in the system. This solution generalizes the classical optimisation solution obtained for the systems with constant parameters. In order to illustrate the problem the appropriate example has been presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 387-391
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling fuzzy beliefs of agents
Modelowanie rozmytych przekonań agentów
Autorzy:
Kacprzak, M.
Kosiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/341127.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
skierowane liczby rozmyte
schodkowe skierowane liczby rozmyte
rozmyte przekonania
systemy wieloagentowe
ordered fuzzy numbers
step ordered fuzzy numbers
fuzzy beliefs
multi-agent systems
Opis:
Ordered fuzzy numbers (OFN) were introduced by Kosinski, Prokopowicz and Slęzak in 2002. The definition of OFN uses the extension of the parametric representation of convex fuzzy numbers. So far, they were applied to deal with optimization problems when data are fuzzy. In 2011 Kacprzak and Kosinski observed that a subspace of OFN called step ordered fuzzy numbers (SOFN) may be equipped with a lattice structure. In consequence, a Boolean operations like conjunction, disjunction and, what is more important, diverse types of implications can be defined on SOFN. In this paper we show how OFN can be applied in multi-agent systems for modelling agents beliefs about fuzzy expressions. Then we present preliminary version of a logic based on SOFN and study how this logic can be helpful in evaluating features of multi-agent systems concerning agents' fuzzy beliefs.
Skierowane liczby rozmyte (SLR) zostały wprowadzone przez W. Kosińskiego, P. Prokopowicza i D. Slęzaka w 2002 roku. Definicja skierowanych liczb rozmytych wykorzystuje rozszerzenie parametrycznej reprezentacji wypukłych liczb rozmytych. SLR do tej pory były wykorzystywane do rozwiązywania problemów optymalizacyjnych dla rozmytych danych. W 2011 roku M. Kacprzak i W. Kosiński zaobserwowali, że schodkowe skierowane liczby rozmyte (SSLR) stanowiące podprzestrzen SLR tworzą kratę. W konsekwencji, Boolowskie operacje takie jak koniunkcja, alternatywa oraz różne rodzaje (rozmytych) implikacji mogą byc zdefiniowane w zbiorze schodkowych skierowanych liczb rozmytych. Celem niniejszej pracy jest pokazanie nowego zastosowania SLR jakim jest modelowanie przekonań agentów w środowisku systemów wieloagentowych, gdy przekonania te dotyczą rozmytych pojęć i danych. Jest to pierwszy krok w kierunku stworzenia pełnej ´ logiki opartej na wartościach ze zbioru SSLR. Logika ta umożliwi analizę własności systemów, w których agenci mają rozmyte przekonania.
Źródło:
Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2012, 9; 45-60
1644-0331
Pojawia się w:
Zeszyty Naukowe Politechniki Białostockiej. Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 54

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