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1
Content available Noise control of the beginning and development dynamics of faults in the running gear of the rolling stock
Aliev Telman, Babayev Tofig, Alizada Tahir, Rzayeva Narmin
Transport Problems
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2020
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T. 15, z. 2
83--91
EN
In contrast to traditional systems for monitoring fault of the running gear of the rolling stock, this paper proposes a technology of noise control at the onset of defects. The authors consider the possibility of creating an intelligent system that can perform noise diagnostics with the indication of the beginning of the latent period of the initiation of typical defects preceding faults. To this end, using the noise technology, sets of reference informative attributes are created in the training process. The reference sets, in turn, are used to determine the condition of the object at the beginning of the development of defects by comparing them with current noise estimates. It also allows controlling the dynamics of the development of defects.
2
Content available Modelowanie bezpiecznej prędkości RMS „Titanic” na polu lodowym za pomocą wielopoziomowego sterownika rozmytego Mamdaniego
Ficoń K.
Zeszyty Naukowe Akademii Marynarki Wojennej
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2014
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R. 55 nr 2 (197)
23--54
PL
W artykule przedstawiono koncepcję wykorzystania rozmytych sterowników Mamdaniego do modelowania bezpiecznej prędkości RMS „Titanic” w krytycznym momencie rejsu 14 kwietnia 1912 roku. Dla potrzeb dedykowanego sterownika Logic Fuzzy Controller (Titanic) zaprojektowano sytuacyjny model logiczny obrazujący uwarunkowania nawigacyjno-meteorologiczne i eksploatacyjno-organizacyjne panujące w tym rejonie w newralgicznym momencie podróży. Dodatkowo w modelu uwzględniono psychologiczny czynnik presji i prestiżu rejsu, który nie pozostał bez wpływu na podejmowane decyzje. Wariantowe badanie bezpiecznej prędkości RMS „Titanic” przeprowadzono dla czterech hipotetycznych sytuacji decyzyjnych aplikowanych za pomocą eksperckich baz reguł logicznych.
EN
This paper presents a concept of using the Mamdani fuzzy logic controller for modeling a safe speed for the RMS 'Titanic' at the critical moment of her voyage on 14 April, 1912. For the purposes of the Fuzzy Logic Controller (Titanic) a situation-focused logic model was designed. It displays navigation-meteorology and exploitation-organization related conditions in the area at the crucial moment of the voyage. In addition, a psychological factor of pressure and voyage prestige which affected the decisions made was taken into account in the model. Study of variants of safe speed for RMS ‘Titanic’ were made for four hypothetical decision situations using expert bases of logic rules.
3
Content available remote A possibilistic view on set and multiset comparison
Bronselaer A., Hallez A., Tre G. de
Control and Cybernetics
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2009
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Vol. 38, no 2
341-366
EN
Comparative evaluation operators for sets and multisets are proposed from a possibilistic point of view. In general, an evaluator estimates the possibility of (non) co-reference of two arbitrary (sub)-objects. Such operators can be used in a hierarchical possibilistic framework for finding co-referent objects with a complex structure. This paper first discusses properties of evaluators in general and continues with studying operators for sets and multisets, thereby making a clear distinction between hard and soft evaluators. Hard evaluators are based on evaluation of derived (multi)sets, while soft evaluators use a low level evaluator to incorporate co-reference at element level. The two important parts of such a soft evaluator are an injective element mapping and an aggregation function. An algorithm to provide the injective mapping is presented and discussed. For the aggregation step, ordered weighted conjunction is studied by introducing parameterized fuzzy quantifiers to calculate weight vectors. An advanced learning strategy is introduced to train the optimal parameter matrix.
4
Content available remote On some new decompositions of continuity
Ekici E., Noiri T.
Demonstratio Mathematica
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2008
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Vol. 41, nr 1
225-231
EN
The main purpose of this paper is to introduce the concepts of [...] to obtain new decompositions of continuity and super-continuity.
5
Content available remote On gβ-regular and gβ-normal spaces
Tahiliani S.
Demonstratio Mathematica
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2007
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Vol. 40, nr 3
739-743
EN
The aim of this paper is to introduce and study two new classes of spaces, called gβ-regular and gβ-normal spaces. The concept of gβ-regularity and gβ-normality are separation properties obtained by utilizing gβ-closed sets. Recall that a subset A of a space (X, r ) is called gβ-closed if β Cl(A) is a subset of U where A is a subset of U and U is open in X.
6
Content available remote On maps and generalized lambda alfa-sets
Caldas M., Ganster M., Jafari S., Navalagi G. B.
Demonstratio Mathematica
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2005
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Vol. 38, nr 3
729--738
EN
In this paper we introduce and study the concepts of g-lambda alfa-continuous maps, g-lambda alfa-irresolute maps and g-lambda alfa-closed maps by using generalized lambda alfa-sets and generalized Valfa-sets.
7
Content available remote The sets of certain classes in generalized metric spaces
Konik T.
Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
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2004
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Vol. 3, nr 1
53--60
EN
In this paper some property of sets of certain classes in the generalized metric spaces are considered. In last section of this paper an example of a certain set of these classes in two-dimensional Euklidean space will be given.
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