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Wyszukujesz frazę "Demkowicz, J." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Kalman filtering for 3d real time data visualization of multibeam sonar records
Autorzy:
Demkowicz, J.
Moszyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/331515.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
Kalman filtering
sonar records
visualization
Opis:
For the last decade multibeam sonars have been increasingly used for mapping and visualization of the bottom surfaces to provide the 'physical bases' for environmental studies due to theirs unprecedentedly high resolution mapping ability. However, the raw sonar records are subject to systematic errors, random noise and outliers. In this paper Kalman filtering approach to generating optimal estimates of bottom surface from a noisy raw sonar records is presented. The experiment on the surface indicates that after applying the Kalman filtering technique the outliers of raw records can be efficiently detected and removed. Moreover in the same time, the two-step Kalman filtering method is applied, which aims to filter every multibeam sonar swath and enable 3D seabed visualization in real time. The 3D bottom relief before, and after the filtering method application is also presented.
Źródło:
Hydroacoustics; 2003, 6; 189-194
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
VRML visualization of pelagic fish movement in the echosounder beam
Autorzy:
Moszyński, M.
Bikonis, K.
Demkowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/332747.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
VRML
pelagic
fish
echosounder beam
Opis:
During over thirty years of development of echosounders, the acquisition software has developed different kind of charts for data visualization. In the paper the concept of creation of dynamic echograms from the data acquired in acoustical surveys is presented. As the modern split-beam echosounders allow for nonambiguous localization of targets in the water column, it is possible to visualize them in 3D coordinate system. Virtual Reality Modeling Language VRML is a popular language used in modeling of virtual reality. Using its build-in properties, it is relatively easy to visualize movement of fish treated as an object in any coordinate system. VRML despite the typical application in computer graphics is also used in other various fields. For instance in chemistry it is used for visualization of atom particles, in medicine for modeling of human organs, in astronomy for visualization of trajectories of the stars and in geography and navigation for creation of 3D maps. Hence, in this paper we describe its application in fisheries. Additionally, as the any WWW browser can be equipped with VRML plugin 3D fish visualization can be redistributed in the Internet.
Źródło:
Hydroacoustics; 2003, 6; 53-58
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of the dual constellation GPS/GALILEO mobile device for improving navigation of the visually impaired in an urban area
Autorzy:
Drypczewski, K.
Moszyński, M.
Demkowicz, J.
Bikonis, K.
Stepnowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/258979.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
dual constellation receiver
GPS
Galileo
voice maps
navigation for the blind
visually impaired
personal navigation device
PND
Opis:
The article discusses damages of essential tribological associations in crankshaft and piston systems of large power two-stroke engines used as main engines, which take place during transport tasks performed by those ships. Difficulties are named which make preventing those damages impossible, despite the fact that the technical state of engines of this type is identified with the aid of complex diagnostic systems making use of advanced computer technology. It is demonstrated that one of causes of the damages is the lack of research activities oriented on recognising random properties of the loads leading to those damages. A proposal is made for the loads acting at a given time t on tribological associations in crankshaft and piston systems of internal combustion engines used as main engines to be considered as random variables Qt. At the same time the loads examined within a given time interval tr ≤ t ≤ tz would be considered stochastic processes {Q(t): t ≥ 0}. Essential properties of the loads of the abovementioned tribological associations are named and explained by formulating hypotheses which need empirical verification. Interval estimation is proposed for estimating the expected value E(Qt) of the load Qt acting at time t. A relation is indicated between the mechanical load and the thermal load acting on tribological associations in the ship main engine crankshaft and piston system. A suggestion is formulated that a stochastic form of the relation between these types of load is to be searched for, rather than statistic relation, and a proposal is made to measure the intensity (strength) of the stochastic relation using the Czuprow’s convergence coefficient.
Źródło:
Polish Maritime Research; 2015, 4; 15-20
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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