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Wyszukujesz frazę "Evidence" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
New Approach Towards Position Fixing
Autorzy:
Filipowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/320811.pdf
Data publikacji:
2010
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
position fixing
mathematical theory of evidence
fuzzy reasoning
Opis:
Navigation aids indications, measured distances and bearings are random values governed by various distributions, normal characteristic is widely assumed. Navigation handbooks read that mean error of bearing taken with radar is within a given range, distance error is within certain percentage of an obtained value. It is also known that measurements taken to different landmarks can be subjectively evaluated therefore diversified. All the mentioned factors are to be taken into account once vessel position is being fixed. In order to include them into a calculation scheme one has to engage new ideas and use different approaches. Mathematical Theory of Evidence extended for fuzzy environment proved to be universal platform for wide variety of new solutions in navigation.
Źródło:
Annual of Navigation; 2010, 16; 41-53
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Nautical Observation Errors Evaluation
Autorzy:
Filipowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/117354.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Nautical Observation
Navigational Method
mathematical theory of evidence (MTE)
Errors Evaluation
Observation Errors Evaluation
Plausibility
Systematic Errors Identificatio
Navigational Evidence
Opis:
Mathematical Theory of Evidence (MTE) enables upgrading models and solving crucial problems in many disciplines. MTE delivers new unique opportunity once one engages possibilistic concept. Since fuzziness is widely perceived as something that enables encoding knowledge thus models build upon fuzzy platforms accepts ones skill within given field. At the same time evidence combining scheme is a mechanism enabling enrichment initial data informative context. Therefore it can be exploited in many cases where uncertainty and lack of precision prevail. In nautical applications, for example, it can be used in order to handle data feature systematic and random deflections. Theoretical background was discussed and computer application was successfully implemented in order to cope with erroneous and uncertain data. Output of the application resulted in making a fix and a posteriori evaluating its quality. It was also proven that it can be useful for calibrating measurement appliances. Unique feature of the combination scheme proven by the author in his previous paper, enables identifying measurement systematic deflection. Based on the theorem the paper aims at further exploration of practical aspects of the problem. It concentrates on reduction of hypothesis frame reduction and random along with systematic errors identifications.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 545-550
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the mathematical theory of evidence in navigation
Autorzy:
Filipowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/135523.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
nautical evidence
uncertainty
belief structures
position fixing
fix accuracy
systematic errors evaluation
Opis:
In most problems encountered in navigation, imprecision and uncertainty dominate. Methods of their processing rely on rather obsolete formalisms based on probability and statistics. Available solutions exploit a limited amount of available data, and knowledge is necessary to interpret the achieved results. Profound a posteriori analysis is rather limited; thus, the informative context of solutions is rather poor. Including knowledge in a nautical data processing scheme is impossible. Remaining stuck with the traditional formal apparatus, based on probability theory, one cannot improve the informative context of obtained results. Traditional approaches toward solving problems require assumptions imposed by the probabilistic model that exclude possibility of modelling uncertainty. It should be noticed that the flexibility of exploited formalism decide the quality of upgrading models and, subsequently, on the universality of the final results. Therefore, extension of the available formalisms is a challenge to be met. Many publications devoted to the mathematical theory of evidence (MTE) and its adaptation for nautical science in order to support decision making in navigational processes have enabled one to submit and defend the following proposition. Many practical problems related to navigational ship conducting and to feature uncertainty can be solved with MTE; the informative context of the obtained results is richer when compared to those acquired by traditional methods. Additionally, a posteriori analysis is an inherent feature of the new foundations. The brief characteristics of a series of publications devoted to the new methodology are the main topics of this paper.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 159-167
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problem wykrycia i problem pokrycia
Problem of detecting objects and of covering an area
Autorzy:
Filipowicz, W.
Neumann, T.
Powiązania:
https://bibliotekanauki.pl/articles/360375.pdf
Data publikacji:
2008
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
matematyczna teoria ewidencji
fuzja danych nawigacyjnych
mathematical evidence theory
navigational data fusion
Opis:
Radar jest przykładem urządzenia nawigacyjnego, za pomocą którego możliwe jest monitorowanie obszarów wodnych. Charakteryzuje się on, jak każde urządzenie techniczne, pewnym ograniczonym poziomem funkcjonalności oraz niezawodności. Rozmieszczenie stacji obserwacyjnych w taki sposób, aby prawdopodobieństwo wykrycia dowolnego obiektu w dowolnym miejscu było większe od zadanej wartości progowej, jest zadaniem optymalizacyjnym. Sformułowanie oraz metoda rozwiązania powyższego zadania zostały przedstawione w prezentowanym artykule.
The radar is an example of a navigational device which enables monitoring of the sea areas. As every technical device, it is characterized by a certain limited level of functionality and reliability. Arranging observation stations so that plausibility of detecting any object at any place is greater than the threshold value is an operational research task. Formulation of the problem and the methods for solving it are presented in the paper.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2008, 13 (85); 10-14
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A logical device for processing nautical data
Autorzy:
Filipowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/135599.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
probability density
probability distributions
nautical evidence
uncertainty model
nautical propositions
simple belief structure
Opis:
Nautical measurements are randomly and systematically corrupted. There is a rich scope of knowledge regarding the randomness shown by results of observations. The distribution of stochastic distortions remains an estimate and is imprecise with respect to their parameters. Uncertainties can also occur through the subjective assessment of each piece of available data. The ability to model and process all of the aforementioned items through traditional approaches is rather limited. Moreover, the results of observations, the final outcome of a quality evaluation, can be estimated prior to measurements being taken. This a posteriori analysis is impaired and it is outside the scope of traditional, inaccurate data handling methods. To propose new solutions, one should start with an alternative approach towards modelling doubtfulness. The following article focusses on belief assignments that may benefit from the inclusion of uncertainty. It starts with a basic interval uncertainty model. Then, assignments engaging fuzzy locations around nautical indications are discussed. This fragment includes transformation from density functions to probability distributions of random errors. Diagrams of the obtained conversions are included. The presentation concludes with a short description of a computer application that implements the presented ideas.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 52 (124); 65-73
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Application of Mathematical Theory of Evidence in Navigation
Autorzy:
Filipowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/116718.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
mathematical theory of evidence (MTE)
MTE in Navigation
marine navigation
Dempster-Shafer theory
Probability Assignment
Fuzzy Values
Uncertainty
Belief Structures
Opis:
Plenty of various quality data are available to the officer of watch. The data of various qualities comes from different navigational aids. This kind of data creates new challenge regarding information association. The challenge is met by Mathematical Theory of Evidence. The theory delivers methods enabling combination of various sources of data. Results of association have informative context increased. Associated data enable the navigator to refine his position and his status regarding dangerous places. The procedure involves uncertainty, ambiguity and vague evidence. Imprecise and incomplete evidence can be combined using extended Dempster-Shafer reasoning scheme.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 4; 423-430
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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