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    Wyświetlanie 1-4 z 4
    Tytuł:
    Bitmap based structures for the modeling of fuzzy entities
    Autorzy:
    Verstraete, J.
    Tre, G. de
    Hallez, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970481.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    imprecise GIS
    uncertain GIS
    fuzzy data modelling
    fuzzy bitmaps
    Opis:
    Bitmap models are a known technique to model field based geographic information. Commonly, geographic information is modelled in a crisp sense, even though in reality it most likely is an approximation. In this article, we present the use of bitmap based structures to model imprecise or uncertain locations and ditto regions: these structures should be considered to be extensions of respectively a point and a polygon. The imprecission or uncertainty is modelled using fuzzy set theory. Apart from presenting the structures, appropriate operators are denned and explained.
    Źródło:
    Control and Cybernetics; 2006, 35, 1; 147-164
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A possibilistic view on set and multiset comparison
    Autorzy:
    Bronselaer, A.
    Hallez, A.
    Tre, G. de
    Powiązania:
    https://bibliotekanauki.pl/articles/970953.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    evaluator
    co-reference
    multisets
    sets
    Opis:
    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.
    Źródło:
    Control and Cybernetics; 2009, 38, 2; 341-366
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A qualitative trajectory calculus as a basis for representing moving objects in Geographical Information Systems
    Autorzy:
    Weghe, N. van de
    Cohn, A. G.
    Tre, G. de
    Maeyer, P. de
    Powiązania:
    https://bibliotekanauki.pl/articles/970477.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    obiekt ruchomy
    wnioskowanie jakościowe
    specyfikacja jakościowa
    moving objects
    qualitative reasoning
    qualitative representation
    spatio-temporal modelling
    Opis:
    Qualitative formalisms, suited to express qualitative temporal or spatial relationships between entities, have gained wide acceptance as a useful way of abstracting from the real world. The question remains how to describe spatio-temporal concepts, such as the interaction between disconnected moving objects, adequately within a qualitative calculus and more specifically how to use this in geographical information systems. In this paper, the Basic Qualitative Trajectory Calculus (QTCB) for representing and reasoning about moving objects is presented. QTCB enables comparisons between positions of objects at different time points ro be made. The calculus is based on few primitives (i.e., distance and speed constraints), making it elegant and theoretically simple. To clarify the way in which trajectories are represented within QTCB: specific cases of movements (e.g. circular movement) are presented. To illustrate the naturalness of QTC, a "predator-prey" example is studied.
    Źródło:
    Control and Cybernetics; 2006, 35, 1; 97-119
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling imperfect time intervals in a two-dimensional space
    Autorzy:
    Qiang, Y.
    Delafontaine, M.
    Asmussen, K.
    Stichelbaut, B.
    De Tre, G.
    De Maeyer, P.
    Van de Weghe, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/970193.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    rough set
    rough time interval
    fuzzy set
    fuzzy time interval
    Triangular Model
    temporal relation
    Opis:
    Every event has an extent in time, which is usually described by crisp time intervals. However, under some circumstances, temporal extents of events are imperfect, and therefore cannot be adequately modelled by crisp time intervals. Rough sets and fuzzy sets are two frequently used tools for representing imperfect temporal information. In this paper, we apply a two-dimensional representation of crisp time intervals, which is called the Triangular Model (TM), to investigate rough time intervals (RTIs) and fuzzy time intervals (FTIs). With this model, RTIs and FTIs, as well as their temporal relations, can be represented as graphics (i.e. discrete geometries or continuous fields) in a two-dimensional time space. Compared to the traditional linear representation of time intervals, we found that TM provides a more compact and clearer representation of imperfect time intervals and relations. Moreover, temporal queries of imperfect intervals can be graphically addressed in TM, which is closer to human intuition than mathematical expressions. As human minds are more efficient in perceiving and processing graphic representations than numerical representations, we believe TM can be applied as a valuable assistant tool for analysing and reasoning about imperfect time intervals.
    Źródło:
    Control and Cybernetics; 2010, 39, 4; 983-1010
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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