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Wyszukujesz frazę "Narkiewicz, Janusz" wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
A collision avoidance algorithm in Simultaneous Localization and Mapping problem for mobile platforms
Autorzy:
Małecki, Tomasz
Narkiewicz, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2086976.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
algorithm
modeling
path planning
SLAM
Opis:
A collision avoidance algorithm applicable in simultaneous localization and mapping (SLAM) has been developed with a prospect of an on-line application for mobile platforms to search and map the operation area and avoid contact with obstacles. The algorithm, which was implemented in MATLAB software, is based on a linear discrete-time state transition model for determination of the platform position and orientation, and a ‘force’ points method for collision avoidance and definition of the next-step of platform motion. The proposed approach may be incorporated into real-time applications with limited on-board computational resources.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 317--328
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of algorithms for satellite attitude determination using data from visual sensors
Autorzy:
Narkiewicz, Janusz
Sochacki, Mateusz
Rodacki, Adam
Grabowski, Damian
Powiązania:
https://bibliotekanauki.pl/articles/2086831.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
space
navigation
attitude determination
visual sensors
przestrzeń
nawigacja
determinacja postawy
czujnik wizualny
Opis:
The objective of the research was to investigate the efficiency of selected methods of data fusion from visual sensors used on-board satellites for attitude measurements. Data from a sun sensor, an earth sensor, and a star tracker were fused, and selected methods were applied to calculate satellite attitude. First, a direct numerical solution, a numerical and analytical solution of the Wahba problem, and the TRIAD method for attitude calculation were compared used for integrating data produced by a sun sensor and an earth sensor. Next, attitude data from the star tracker and earth/sun sensors were integrated using two methods: weighted average and Kalman filter. All algorithms were coded in the MATLAB environment and tested using simulation models of visual sensors. The results of simulations may be used as an indication for the best data fusion in real satellite systems. The algorithms developed may be extended to incorporate other attitude sensors like inertial and/or GNSS to form a complete satellite attitude system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137935, 1--7
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody rozwoju oprogramowania krytycznego dla bezpieczeństwa
Safety Critical Software Development Methodologies in Avionics
Autorzy:
Zakrzewski, Paweł
Narkiewicz, Janusz
Brenchly, Darren
Powiązania:
https://bibliotekanauki.pl/articles/36412161.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
avionics
safety critical software
Agile
systems engineering
awionika
oprogramowanie krytyczne dla bezpieczeństwa
metody zwinne
inżynieria systemowa
Opis:
Artykuł podsumowuje metody rozwoju oprogramowania krytycznego dla bezpieczeństwa, oraz wpływ standardu DO-178C na potencjalne zastosowanie metod zwinnych. Wyjaśniamy w nim także kategoryzację oprogramowania krytycznego w systemach lotniczych. Artykul opisuje różnice w podejściu do procesu tworzenia oprogramowania od metody kaskadowej, przez model V, aż do metody iteracyjnej i przyrostowej, wraz ze wskazaniem ich największych zalet. Opisane zostały najważniejsze zasady leżące u podstaw metod zwinnych, oraz Scrum jako popularny framework stosowany w tworzeniu oprogramowania nie-krytycznego. Analiza możliwości zastosowania metod zwinnych do tworzenia oprogramowania krytycznego dla bezpieczeństwa w awionice została oparta na praktycznym doświadczeniu autorów. Uwzględnia wymagania standardu DO-178C, wielkość projektu, skalowalność metody, oraz kulturę organizacji. Zdefniowanie zwinnej metody ramowej tworzenia oprogramownia krytycznego dla bezpieczeństwa, spójnej z procesem certyfikacji i istniejącymi standardami zostało uznane za potencjalny przełom dla rozwoju systemów awioniki.
This article summarizes avionics safety-critical software development methodologies and implications of the DO-178C standard from an Agile application perspective. We explain the safety-critical software categorization. It also outlines the main differences and advantages of different approaches to the development process, from Waterfall through the V-model to Iterative and Incremental. Agile principles are explained as well as a Scrum – which is a popular framework in the non-safety-critical software industry. The application of Agile, for safety-critical software considerations, is based on the practical knowledge of the authors, and looks at the potential solution from a DO-178C standard, size of the project, scalability, and organizational culture points of view. Definition of the Agile type of framework, consistent with the certification process and existing standards, has been highlighted as a potential game-changer for the avionics industry.
Źródło:
Transactions on Aerospace Research; 2020, 2 (259); 59-71
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie kliniczne ekspresji neuropiliny-1 u chorych na raka jajnika
Clinical signifi cance of neuropilin-1 expression in patients with ovarian cancer
Autorzy:
Klasa-Mazurkiewicz, Dagmara
Narkiewicz, Joanna
Milczek, Tomasz
Lipińska, Barbara
Emerich, Janusz
Wydra, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1030638.pdf
Data publikacji:
2009
Wydawca:
Medical Communications
Tematy:
angiogenesis
lymphangiogenesis
neuropilin
ovarian cancer
prognostic factors
angiogeneza
czynniki prognostyczne
kluczowe: rak jajnika
limfangiogeneza
neuropilina
Opis:
Background: Angiogenesis is a key process in the development of a malignant tumor, enabling both growth of primary lesion and spread of metastases. Most potent stimulators of normal and pathological angiogenesis are proteins of the vascular endothelial growth factor (VEGF) family. Regulation of angiogenesis process is also mediated by neuropilin- 1 (NP-1), as coreceptor VEGFR-2. NP-1 plays a crucial role controlling both normal angiogenesis during embryonal development and pathological angiogenesis in malignant tumors. The aim of this paper was to assess NP-1 expression in ovarian cancer and to analyze correlations between NP-1 expression and selected clinical-pathological factors in a group of ovarian cancer patients. Material and method: Analyzed was the relative level of NP-1 in 168 surgical specimens collected during surgical procedures performed at the Department of Oncologic Gynecology of Medical University in Gdańsk. Tissue samples included: 32 healthy tissues, 42 benign tumors, 10 borderline tumors, 76 ovarian cancers, 8 metastatic tumors. Relative NP-1 level was assessed using Western blotting technology. Results: Overexpression of NP-1 was seen significantly more often in early clinical stages of ovarian cancer (p=0.01), in cancers other than serous (p=0.04) and in patients with peritoneal exudate (p=0.03). Log-rank test did not reveal any significant correlation between NP-1 expression and favorable response to chemotherapy, disease-free survival or total survival time. Conclusions. Elevated NP-1 level seen in initial clinical stages of ovarian cancer may indicate crucial role of neoangiogenesis in the early phase of tumor development.
Źródło:
Current Gynecologic Oncology; 2009, 7, 4; 237-247
2451-0750
Pojawia się w:
Current Gynecologic Oncology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in expression of serine proteases HtrA1 and HtrA2 during estrogen-induced oxidative stress and nephrocarcinogenesis in male Syrian hamster
Autorzy:
Zurawa-Janicka, Dorota
Kobiela, Jaroslaw
Stefaniak, Tomasz
Wozniak, Agnieszka
Narkiewicz, Joanna
Wozniak, Michał
Limon, Janusz
Lipinska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/1040768.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
17-β-estradiol
HtrA proteases
estrogen-induced carcinogenesis
oxidative stress
Opis:
Serine proteases HtrA1 and HtrA2 are involved in cellular stress response and development of several diseases, including cancer. Our aim was to examine the involvement of the HtrA proteins in acute oxidative stress response induced in hamster kidney by estrogen treatment, and in nephrocarcinogenesis caused by prolonged estrogenization of male Syrian hamster. We used semi-quantitative RT-PCR to estimate the HtrA1 and HtrA2 mRNA levels in kidney tissues, and Western blotting to monitor the amount of the HtrA proteins. Within the first five hours following estrogen administration both HtrA1 mRNA and the protein levels were increased significantly. No changes in the expression of HtrA2 were observed. This indicates that HtrA1 may be involved in the response against oxidative stress induced by estrogen treatment in hamster kidney. During prolonged estrogenization, a significant reduction of the HtrA1 mRNA and protein levels was observed after 6 months of estradiol treatment, while the expression of HtrA2 was significantly elevated starting from the third month. This suggests an involvement of the HtrA proteins in estrogen-induced nephrocarcinogenesis in hamster. Using fluorescence in situ hybridization we localized the HtrA1 gene at the qb3-4 region of Syrian hamster chromosome 2, the region known to undergo a nonrandom deletion upon prolonged estrogenization. It is possible that the reduced level of HtrA1 expression is due to this chromosomal aberration. A full-length cDNA sequence of the hamster HtrA1 gene was obtained. It codes for a 50 kDa protein which has 98 and 96% identity with mouse and human counterparts, respectively.
Źródło:
Acta Biochimica Polonica; 2008, 55, 1; 9-20
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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