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    Wyświetlanie 1-4 z 4
    Tytuł:
    Rib kinematics analysis in oblique and lateral impact tests
    Autorzy:
    Jastrzębski, Dominik
    Perz, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/306287.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pęknięcie
    tułów
    żebro
    THUMS
    fracture
    thorax
    rib
    Opis:
    Understanding thorax kinematics and rib breaking mechanisms in conditions of oblique and lateral impact is crucial in safety systems development. To increase knowledge level on this subject, simulation and experimental tests are necessary. The purpose of this study was to obtain single rib kinematics in the case of oblique and lateral impact conditions using numerical simulation approach. Methods: Two impact tests using human body model of a 50th percentile man (THUMS v4.0.1 AM50) were performed in LS-Dyna R7.1.1. Impactor was a rigid cylinder with a diameter of 152 mm, and velocity equal to 6.7 m/s. Impact angle measured to sagittal plane was 30 and 90°, respectively in oblique and lateral impact case. Results: Kinematics of ribs from 3rd to 6th were analyzed. Results shown significant similarities between oblique impact and kinematics of ribs tested in frontal impact conditions in the literature, with maximal costochondral joint displacement relatively to costovertebral joint varying from 65.4 mm (3rd rib) to 82.0 mm (5th rib). Deformation of rib in lateral impact conditions was different than during oblique impact test, with distinctive “flattening” approximately in the middle of the rib. Maximal relative displacement varies from 16.4 mm (6th rib) to 26.6 mm (5th rib) and its location depends on the analyzed rib. Conclusions: Oblique impact scenario may be simulated for the single rib on an experimental way using set-up of the frontal impact. Experimental simulation of the lateral impact for the single rib should not use the same set-up, as the kinematics analysis showed significant differences between simulated cases.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 1; 135-141
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unmanned aerial vehicles in the protection of the elements of a country’s critical infrastructure – selected directions of development
    Autorzy:
    Bielawski, Radosław
    Rządkowski, Witold
    Perz, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/576505.pdf
    Data publikacji:
    2018-12-20
    Wydawca:
    Akademia Sztuki Wojennej
    Tematy:
    security
    critical infrastructure
    unmanned aerial system/vehicle (UAS/UAV)
    programme “Świerszcz” [English: “Cricket”]
    Opis:
    This paper explores the directions for the application of unmanned aerial vehicles in the provision of security to vital elements of a country’s critical infrastructure. The analysis focuses on two paths of development: the first one refers to the transportation system, the latter is related to the gas supply network – the basic components of a country’s critical infrastructure. The first section of this paper will examine the current state of knowledge in the field, and is designed as a reference of terminology pertaining to unmanned aerial vehicles (definitions and classification). The section shall furthermore provide a basis for and a contribution to the developed conceptual-semantic framework for UAV research. The first direction of development is described in terms of the characteristics and assumptions of the system; this includes an overview of the specific requirements of the unmanned platform itself, as well as the elements of the system, such as a local monitoring centre and other components. Furthermore, this section provides the overview of the designated mobile application, whose development is expected to improve the efficiency of system operation, which is a conceptual novelty considering similar developments. The second direction concerns the development of an unmanned system of production, storage, and use of chemical and radioactive substances, including pipelines for hazardous substances. The programme that fits perfectly in the framework of the second considered branch of development is “Cricket” [Polish: “Świerszcz”] – a programme implemented in the periodic inspection of gas supply infrastructure. The description of the programme in question included specifying the technical and operational requirements for the fight devices as well as for the equipment.
    Źródło:
    Security and Defence Quarterly; 2018, 22, 5; 3-19
    2300-8741
    2544-994X
    Pojawia się w:
    Security and Defence Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Animal Detection in Thermal Images Using YOLO Architecture
    Autorzy:
    Popek, Łukasz
    Perz, Rafał
    Galiński, Grzegorz
    Abratański, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/27311963.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    artificial neural networks
    YOLOv5
    transfer learning
    genetic algorithm
    thermal imaging
    Opis:
    The article presents research on animal detection in thermal images using the YOLOv5 architecture. The goal of the study was to obtain a model with high performance in detecting animals in this type of images, and to see how changes in hyperparameters affect learning curves and final results. This manifested itself in testing different values of learning rate, momentum and optimizer types in relation to the model’s learning performance. Two methods of tuning hyperparameters were used in the study: grid search and evolutionary algorithms. The model was trained and tested on an in-house dataset containing images with deer and wild boars. After the experiments, the trained architecture achieved the highest score for Mean Average Precision (mAP) of 83%. These results are promising and indicate that the YOLO model can be used for automatic animal detection in various applications, such as wildlife monitoring, environmental protection or security systems.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 4; 826--831
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie środowiska LabVIEW w realizacji badań eksperymentalnych urządzeń cieplnych
    Application of labVIEW environment during realization of experimental research in thermal devices
    Autorzy:
    Judt, Wojciech
    Urbaniak, Rafał
    Ciupek, Bartosz
    Perz, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/310819.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    pomiary cieplne
    kotły grzewcze
    środowisko LabVIEW
    thermal measurements
    heating boilers
    LabVIEW environment
    Opis:
    W artykule omówiono możliwości zautomatyzowania archiwizacji wyników pomiarów uzyskiwanych podczas badań eksperymentalnych urządzeń cieplnych. Do tego celu wykorzystano środowisko LabVIEW umożliwiające przygotowanie programu pomiarowego bez konieczności pisania kodu przy wykorzystaniu klasycznych języków programowania. W artykule pokrótce opisano typy czujników pomiarowych, które zwykle wykorzystywane są przy tego typu pomiarach. Ponadto przedstawiono specyfikację sprzętową w postaci układu pomiarowego wymaganego do współpracy z tego typu oprogramowaniem komputerowym. Artykuł przedstawia również metodologię przygotowania programu pomiarowego w środowisku LabVIEW.
    Paper discussed possibilities of realization of automatic measurements obtained during experimentally research in heating devices. LabVIEW environment was used for this purpose. This software allow to prepare a measurement application without necessity of clasical programming language using. Article presents type of detectors, which are popularly used during realization of this type of measurements. Also a hardware specification was presented, which is required in cooperation with this type of software. Paper also presents a methodology of measurement application preparation for this type of experimental research.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 1-2; 272-276
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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