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    Wyświetlanie 1-6 z 6
    Tytuł:
    Praktyka oszacowań błędów wartości własnych operatorów różniczkowych znajdowanych metodą różnicową sprzężoną z QR-algorytmem
    Autorzy:
    Hobot, G.
    Stefańczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/748112.pdf
    Data publikacji:
    1975
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Applied Mathematics
    Źródło:
    Mathematica Applicanda; 1975, 3, 4
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Safe strategy of door opening with impendance controlled manipulator
    Autorzy:
    Winiarski, T.
    Banachowicz, K.
    Stefańczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/384427.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    manipulation
    impedance control
    service robots
    Opis:
    Modern robotic systems are able to localize doors and its handle or knob, grasp the handle and open the door. Service robots need to open doors and drawers to autonomously operate in human environment. The mechanical properties of doors lead to incorporation of force and velocity constraints into the control law, to avoid the environment damage. In the article the impedance control law was expanded with these factors to achieve safe behavior of direct (explicit) position-force controller of KUKA LWR4+ robot that opens the door.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2013, 7, 4; 21-26
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D camera and lidar utilization for mobile robot navigation
    Autorzy:
    Stefańczyk, M.
    Banachowicz, K.
    Walęcki, M.
    Winiarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/950794.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mobile robotics
    navigation
    RGB-D sensing
    Opis:
    The article presents a navigation system based on 3D camera and laser scanner capable of detecting a wide range of obstacles in indoor environment. First, existing methods of 3D scene data acquisition are presented. Then the new navigation system gathering data from various sensors (e.g. 3D cameras and laser scanners) is described in a formal way, as well as exemplary applications that verify the approach.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2013, 7, 4; 27-33
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient generation of 3D surfel maps using RGB-D sensors
    Autorzy:
    Wilkowski, A.
    Kornuta, T.
    Stefańczyk, M.
    Kasprzak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/331116.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    RGB-D sensor
    V-SLAM
    surfel map
    frustum culling
    octree
    czujnik RGB-D
    drzewo ósemkowe
    Opis:
    The article focuses on the problem of building dense 3D occupancy maps using commercial RGB-D sensors and the SLAM approach. In particular, it addresses the problem of 3D map representations, which must be able both to store millions of points and to offer efficient update mechanisms. The proposed solution consists of two such key elements, visual odometry and surfel-based mapping, but it contains substantial improvements: storing the surfel maps in octree form and utilizing a frustum culling-based method to accelerate the map update step. The performed experiments verify the usefulness and efficiency of the developed system.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 99-122
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agent-based approach to the design of a multimodal interface for cyber-security event visualisation control
    Autorzy:
    Kasprzak, W.
    Szynkiewicz, W.
    Stefańczyk, M.
    Dudek, W.
    Węgierek, M.
    Seredyński, D.
    Figat, M.
    Zieliński, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/200534.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multimodal interface
    cyber security visualisation
    embodied agent
    Opis:
    Convenient human-computer interaction is essential to carry out many exhausting and concentration-demanding activities. One of them is cyber-situational awareness as well as dynamic and static risk analysis. A specific design method for a multimodal human-computer interface (HCI) for cyber-security events visualisation control is presented. The main role of the interface is to support security analysts and network operators in their monitoring activities. The proposed method of designing HCIs is adapted from the methodology of robot control system design. Both kinds of systems act by acquiring information from the environment, and utilise it to drive the devices influencing the environment. In the case of robots the environment is purely physical, while in the case of HCIs it encompasses both the physical ambience and part of the cyber-space. The goal of the designed system is to efficiently support a human operator in the presentation of cyberspace events such as incidents or cyber-attacks. Especially manipulation of graphical information is necessary. As monitoring is a continuous and tiring activity, control of how the data is presented should be exerted in as natural and convenient way as possible. Hence two main visualisation control modalities have been assumed for testing: static and dynamic gesture commands and voice commands, treated as supplementary to the standard interaction. The presented multimodal interface is a component of the Operational Centre, which is a part of the National Cybersecurity Platform. Creation of the interface out of embodied agents proved to be very useful in the specification phase and facilitated the interface implementation.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1187-1205
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contractile effect of PGF2alpha and PGE2 on isolated branches of uterine and ovarian artery in different days of estrous cycle and early pregnancy in pigs
    Autorzy:
    Skipor, J.
    Pikulinska, M.
    Stefanczyk-Krzymowska, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/30402.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    uterine artery
    ovarian artery
    oestrous cycle
    early pregnancy
    pregnancy
    pig
    prostaglandin E2
    prostaglandin F2 alpha
    uterus
    embryo
    reproductive tract
    veno-arterial communication
    Opis:
    The contractile effects of PGF₂α (3 × 10⁻⁶ to 10⁻⁴ M) and PGE₂ (10⁻⁷ to 10⁻⁵ M) were examined on isolated branches of ovarian artery (OA) and extramyometrial branches of uterine artery (UA) collected from pigs in the luteal (day 10-12) and follicular phase (day 17-20) of the estrous cycle, and during early pregnancy (day 10-12). Strong contraction was demonstrated in both arteries during all investigated periods in response to PGF2α, which was significantly higher (P < 0.01) than to PGE₂, being negligible in the follicular phase. In UA, the effective dose of PGF₂α (ED50) amounted 7.9 × 10⁻⁶ M and 6.3 × 10⁻⁶ M in the luteal and follicular phase, and 5.0 × 10⁻⁶ M in early pregnancy. ED50 for PGE₂ reached 5.0 × 10⁻⁷ M in the luteal phase, and 4.1 × 10⁻⁷ M in early pregnancy. For both prostaglandins, the contraction was much stronger (P < 0.01) in OA than in UA branches. In OA, the ED50 for PGF₂α was 1.2 × 10⁻⁵ M in the luteal phase and was significantly higher (P < 0.05) than in the follicular phase (3.1 × 10⁻⁶ M) and early pregnancy (2.7 × 10⁻⁶ M). ED50 for PGE2 amounted 7.3 × 10⁻⁷ M in the luteal phase and 1.7 × 10⁻⁷ M in early pregnancy. Studies showed the influence of the estrous cycle and early pregnancy on OA branches sensitivity to the contractile effect of PGF₂α and the lack of this effect on UA branches, and the influence of the estrous cycle on UA and OA branch contraction in response to PGE2.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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