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  1. Article ; Online: The Concept of Using the Decision-Robustness Function in Integrated Navigation Systems.

    Czaplewski, Krzysztof / Czaplewski, Bartosz

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 16

    Abstract: The diversity and non-uniformity of the positioning systems available in maritime navigation systems often impede the watchkeeping officer in the selection of the appropriate positioning system, in particular, in restricted basins. Thus, it is necessary ... ...

    Abstract The diversity and non-uniformity of the positioning systems available in maritime navigation systems often impede the watchkeeping officer in the selection of the appropriate positioning system, in particular, in restricted basins. Thus, it is necessary to introduce a mathematical apparatus to suggest, in an automated manner, which of the available systems should be used at the given moment of a sea trip. Proper selection of the positioning system is particularly important in integrated navigation systems, in which the excess of navigation information may impede the final determinations. In this article, the authors propose the use of the decision-robustness function to assist in the process of selecting the appropriate positioning system and reduce the impact of navigation observations encumbered with large errors in self-positioning accuracy. The authors present a mathematical apparatus describing the decision function (a priori object), with the determination of decision-assistance criteria, and the robustness function (a posteriori object), with different types of attenuation function. In addition, the authors present a computer application integrating both objects in the decision-robustness function. The study was concluded by a test showing the practical application of the decision-robustness function proposed in the title.
    Language English
    Publishing date 2022-08-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22166157
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A novel approach exploiting properties of convolutional neural networks for vessel movement anomaly detection and classification.

    Czaplewski, Bartosz / Dzwonkowski, Mariusz

    ISA transactions

    2021  Volume 119, Page(s) 1–16

    Abstract: The article concerns the automation of vessel movement anomaly detection for maritime and coastal traffic safety services. Deep Learning techniques, specifically Convolutional Neural Networks (CNNs), were used to solve this problem. Three variants of the ...

    Abstract The article concerns the automation of vessel movement anomaly detection for maritime and coastal traffic safety services. Deep Learning techniques, specifically Convolutional Neural Networks (CNNs), were used to solve this problem. Three variants of the datasets, containing samples of vessel traffic routes in relation to the prohibited area in the form of a grayscale image, were generated. 1458 convolutional neural networks with different structures were trained to find the best structure to classify anomalies. The influence of various parameters of network structures on the overall accuracy of classification was examined. For the best networks, class prediction rates were examined. Activations of selected convolutional layers were studied and visualized to present how the network works in a friendly and understandable way. The best convolutional neural network for detecting vessel movement anomalies has been proposed. The proposed CNN is compared with multiple baseline algorithms trained on the same dataset.
    MeSH term(s) Algorithms ; Automation ; Movement ; Neural Networks, Computer
    Language English
    Publishing date 2021-02-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2012746-7
    ISSN 1879-2022 ; 0019-0578
    ISSN (online) 1879-2022
    ISSN 0019-0578
    DOI 10.1016/j.isatra.2021.02.030
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Application of Least Squares with Conditional Equations Method for Railway Track Inventory Using GNSS Observations.

    Czaplewski, Krzysztof / Wisniewski, Zbigniew / Specht, Cezary / Wilk, Andrzej / Koc, Wladyslaw / Karwowski, Krzysztof / Skibicki, Jacek / Dabrowski, Paweł / Czaplewski, Bartosz / Specht, Mariusz / Chrostowski, Piotr / Szmaglinski, Jacek / Judek, Slawomir / Grulkowski, Slawomir / Licow, Roksana

    Sensors (Basel, Switzerland)

    2020  Volume 20, Issue 17

    Abstract: Satellite geodetic networks are commonly used in surveying tasks, but they can also be used in mobile surveys. Mobile satellite surveys can be used for trackage inventory, diagnostics and design. The combination of modern technological solutions with the ...

    Abstract Satellite geodetic networks are commonly used in surveying tasks, but they can also be used in mobile surveys. Mobile satellite surveys can be used for trackage inventory, diagnostics and design. The combination of modern technological solutions with the adaptation of research methods known in other fields of science offers an opportunity to acquire highly accurate solutions for railway track inventory. This article presents the effects of work carried out using a mobile surveying platform on which Global Navigation Satellite System (GNSS) receivers were mounted. The satellite observations (surveys) obtained were aligned using one of the methods known from classical land surveying. The records obtained during the surveying campaign on a 246th km railway track section were subjected to alignment. This article provides a description of the surveying campaign necessary to obtain measurement data and a theoretical description of the method employed to align observation results as well as their visualisation.
    Language English
    Publishing date 2020-09-01
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s20174948
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Subarachnoid space: new tricks by an old dog.

    Frydrychowski, Andrzej F / Szarmach, Arkadiusz / Czaplewski, Bartosz / Winklewski, Pawel J

    PloS one

    2012  Volume 7, Issue 5, Page(s) e37529

    Abstract: Purpose: The purpose of the study was to: (1) evaluate the subarachnoid space (SAS) width and pial artery pulsation in both hemispheres, and (2) directly compare magnetic resonance imaging (MRI) to near-infrared transillumination/backscattering sounding ...

    Abstract Purpose: The purpose of the study was to: (1) evaluate the subarachnoid space (SAS) width and pial artery pulsation in both hemispheres, and (2) directly compare magnetic resonance imaging (MRI) to near-infrared transillumination/backscattering sounding (NIR-T/BSS) measurements of SAS width changes in healthy volunteers.
    Methods: The study was performed on three separate groups of volunteers, consisting in total of 62 subjects (33 women and 29 men) aged from 16 to 39 years. SAS width was assessed by MRI and NIR-T/BSS, and pial artery pulsation by NIR-T/BSS.
    Results: In NIR-T/BSS, the right frontal SAS was 9.1% wider than the left (p<0.01). The SAS was wider in men (p<0.01), while the pial artery pulsation was higher in women (p<0.01). Correlation and regression analysis of SAS width changes between the back- and abdominal-lying positions measured with MRI and NIRT-B/SS demonstrated high interdependence between both methods (r = 0.81, p<0.001).
    Conclusions: NIR-T/BSS and MRI were comparable and gave equivalent modalities for the SAS width change measurements. The SAS width and pial artery pulsation results obtained with NIR-T/BSS are consistent with the MRI data in the literature related to sexual dimorphism and morphological asymmetries between the hemispheres. NIR-T/BSS is a potentially cheap and easy-to-use method for early screening in patients with brain tumours, increased intracranial pressures and other abnormalities. Further studies in patients with intracranial pathologies are warranted.
    MeSH term(s) Adolescent ; Adult ; Cerebrovascular Circulation/physiology ; Female ; Humans ; Magnetic Resonance Imaging ; Male ; Sex Factors ; Subarachnoid Space/anatomy & histology ; Young Adult
    Language English
    Publishing date 2012-05-31
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0037529
    Database MEDical Literature Analysis and Retrieval System OnLINE

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