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

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    Wyświetlanie 1-4 z 4
    Tytuł:
    3D imaging of seabed from electronic chart bathymetric data
    Autorzy:
    Demkowicz, J.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331740.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Application of 3D imaging and mapping of seabed is very attractive in many areas including marine cartography, navigation. hydrography, GIS systems etc. There are two competing approaches to constructing 3D images of seabed. The first, off-line method, utilizes the bathymetric information extracted from vectorized digital navigational charts. The second one, on-line technique, employs multibeam sonar seabed echo records processing, The paper describes procedures of bathymetric data analysis for the first method along with newly proposed rendering schemes.
    Źródło:
    Hydroacoustics; 2001, 4; 37-42
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integration of inertial sensors and GPS system data for underwater navigation
    Autorzy:
    Bikonis, K.
    Demkowicz, J.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332423.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The Inertial Navigation System (INS) is usually employed to determine the position of an underwater vehicles, like Remotely Operated Vehicles (ROV) and, more recently, Autonomous Underwater Vehicle (AUV). The accuracy of the position provided by the INS, which uses accelerometers and gyroscopes, deteriorates with time. An external aiding sources such as the Global Positioning System (GPS) can be employed to reduce the error growth in the INS. The GPS aided INS system provides enhance positioning accuracy of the underwater vehicles compared to that of a stand-alone INS technique. In the paper integration algorithm of inertial sensors (accelerometers and gyroscopes) and GPS system data for underwater navigation is presented. For data integration algorithm External Kalman Filter (EKF) is proposed.
    Źródło:
    Hydroacoustics; 2012, 15; 21-26
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D visualisation and monitoring of marine pollutant aggregations in web-based GIS
    Autorzy:
    Łubiniewski, Z.
    Bikonis, K.
    Demkowicz, J.
    Partyka, A.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332356.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the visualisation and monitoring of marine pollutant aggregations as the sample application of the real-time, remotely accessible marine GIS. The system is dedicated for instantaneous integration, processing and visualisation of marine data acquired by direct sampling, satellite remote sensing and underwater acoustic systems. The developed Web-based GIS is capable of producing 2D maps with overlaid various types of data, as well as generating the composed, time-varying 3D scenes presenting different elements of marine environment. As the sample application of the system, the visualisation of the 3D modelling of an oil spill drift and spreading within the southern Baltic area is presented. The data were obtained from the composed 3D modelling system CAROCS. The developed GIS, due to its remote accessibility and the on-line data processing, may be applied as a useful tool for maritime domain awareness and emergency management supporting, with respect to hazard of a different kind: pollution, ecological catastrophes, natural disasters. The system utilises the SQL spatial database for data storage and the Scalable Vector Graphics (SVG) and Virtual Reality Modelling Language (VRML) standards for remote presentation of geographical objects, and requires only the WWW browser with SVG and VRML viewer on the client side.
    Źródło:
    Hydroacoustics; 2006, 9; 103-108
    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 1-4 z 4

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