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    Wyświetlanie 1-7 z 7
    Tytuł:
    Conditions with aggregates evaluated using gradual numbers
    Autorzy:
    Lietard, L.
    Rocacher, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/970944.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    fuzzy sets
    fuzzy condition
    linguistic quantifier
    quantified statement
    aggregate
    Opis:
    This paper is devoted to the evaluation of conditions involving aggregates in the context of flexible querying of relational databases. An example of such a condition is "the maximum salary of young employees is high", where the aggregate max applies to a fuzzy set of salaries. At first, we consider the evaluation of quantified statements where the aggregate count (the cardinality) is implicitly used. We extend this result to conditions involving the aggregates average, maximum or minimum. The contribution of this paper is to propose a new theoretical background for their evaluations based on an arithmetic on gradual numbers (Nƒ,Zƒ,Qƒ).
    Źródło:
    Control and Cybernetics; 2009, 38, 2; 395-417
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy trading system on the forex market for deriving the portfolio of instruments
    Autorzy:
    Juszczuk, Przemysław
    Kruś, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/31342748.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    trading system
    forex market
    fuzzy sets
    multicriteria optimization
    Opis:
    Decision support and trading systems for the forex market mostly derive a single signal for the decision-maker. This is so, because instruments are evaluated based on a single criterion, which creates a ranking of instruments, from which the best one is selected. At the same time, one can observe a lack of tools al- lowing one to derive the set of non-dominated trading opportunities considered in the multicriteria space. This article focuses on multicriteria analysis, in which several different market indicators describe a single instrument on the forex market (currency pair), leading to definite criteria. Thus, for a given time horizon, we consider a set of currency pairs described by a group of technical market indicators in every trading session. However, instead of deriving crisp information, based on the buy-no buy binary logic, we use concepts from the fuzzy sets theory, in which each criterion for a single variant takes a value from the h0, 1i interval. We select only the non-dominated variants from such a set, which will be used as elements of the portfolio of currency pairs on the forex market. We test our idea on the real-world data covering more than ten years, several technical market indicators, and over twenty different currency pairs. The preliminary results show that the proposed idea can be treated as a promising concept for deriving a portfolio of currency pairs instead of focusing on only a single currency pair.
    Źródło:
    Control and Cybernetics; 2022, 51, 4; 467-486
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Similarity measures for Atanassov’s intuitionistic fuzzy sets : some dilemmas and challenges
    Autorzy:
    Szmidt, Eulalia
    Kacprzyk, Janusz
    Bujnowski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2183493.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    similarity measures
    Atanassov’s intuitionistic fuzzy sets
    distances
    complement
    Opis:
    We discuss some aspects of similarity measures in the context of Atanassov’s intuitionistic fuzzy sets (IFSs, for short). IFSs, proposed in 1983, are a relatively new tool for the modeling and simulation and, because of their construction, present us with new challenges as far the similarity measures are concerned. Specifically, we claim that the distances alone are not a proper measure of similarity for the IFSs. We stress the role of a lack of knowledge concerning elements (options, decisions, etc.) and point out the role of the opposing (complementing) elements. We also pay attention to the fact that it is not justified to talk about similarity when one has not enough knowledge about the compared objects/elements. Some novel measures of similarity are presented.
    Źródło:
    Control and Cybernetics; 2022, 51, 2; 249--266
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New developments in fuzzy clustering with emphasis on special types of tasks
    Autorzy:
    Viattchenin, D. A.
    Owsiński, J. W.
    Kacprzyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/206677.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    clustering
    fuzzy sets
    possibilistic clustering
    inference
    three-way clustering
    feature selection
    Opis:
    The paper is devoted to a survey of work done in fuzzy clustering, mainly during the first decade of the 21st century, and that with emphasis on various approachesto the problem, as well as various formulations of the very problem. That is why not only the classical formulations are treated, but several other problems, related to (the use of) clustering, like feature selection, inference systems, three-way clustering, and, on the other hand, such formulations of clustering as the possibilistic one or the one involving intuitionistic fuzzy sets. These are treated as the background for presentation of some specific ideas of the main author, concerning definite heuristic algorithms for effective solving of some of these problems.
    Źródło:
    Control and Cybernetics; 2018, 47, 2; 115-130
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft methods in statistical quality control
    Autorzy:
    Grzegorzewski, P.
    Hryniewicz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/206289.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    statystyczna kontrola jakości
    zbiór rozmyty
    control charts
    fuzzy sets
    sampling plans
    vague data
    Opis:
    The paper is devoted to soft methods in statistical quality control. A review of existing tools for dealing with vague data or fuzzy requirements is given. Some new procedures are also proposed.
    Źródło:
    Control and Cybernetics; 2000, 29, 1; 119-140
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the evaluation of compatibility with gradual rules in information systems : a topological approach
    Autorzy:
    Kortelainen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/205981.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    analiza danych
    topologia
    zbiór rozmyty
    data analysis
    knowledge acquisition
    L-fuzzy sets
    modifier logic
    rough sets
    topology
    Opis:
    The paper presents an approach to detecting dependence of a decision-maker's actions (or decisions) on conditions with respect to a certain type of fuzzy rules, namely gradual rules. Gradual rules are of the form "the more c is C, the more d is D", where C and D are L-fuzzy sets on the domain of the attributes c and d with membership values possibly in different lattices, respectively. The decision-maker's actions and conditions for those are found in a data base-like system, called an information system. We use the information system to define relations corresponding to L-fuzzy sets, and we define weakening modifiers by these relations. These modifiers are closure operators in the corresponding topologies, and we can define fineness relation between L-fuzzy sets. This relation is useful when comparing different decision-maker's actions. We define strong degree and topological degree of depedence of the attributes (with respect to a gradual rule), and we study some properties of those. Finally, we present a small application.
    Źródło:
    Control and Cybernetics; 1999, 28, 1; 121-131
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical inference about the median from vague data
    Autorzy:
    Grzegorzewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/205933.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    estymacja
    metoda nieparametryczna
    metoda statystyczna
    testowanie hipotezy
    zbiór rozmyty
    confidence interval
    estimation
    fuzzy numbers
    fuzzy sets
    hypothesis testing
    median
    nonparametric statistics
    sign-test
    vague data
    Opis:
    In traditional statistics all parameters of the mathematical model and possible observations should be well defined. Sometimes such assumption appears too rigid for the real-life problems, especially when dealing with imprecise or linguistic data. To relax this rigidity fuzzy methods are incorporated into statistics. This paper is devoted to statistical inference about the population median in the presence of vague data. We propose the notion of fuzzy median. Then we suggest a fuzzy estimator and fuzzy confidence interval for the median. Next we discuss the problem of hypothesis testing concerning the median in the presence of imprecise data. All methods presented are distribution-free.
    Źródło:
    Control and Cybernetics; 1998, 27, 3; 447-464
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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