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    Wyświetlanie 1-8 z 8
    Tytuł:
    Point-plane distance AS model for uncertainty evaluation of coordinate measurement
    Autorzy:
    Płowucha, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/1849154.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    task specific uncertainty
    uncertainty of coordinate measurement
    measurement models
    Type B evaluation
    sensitivity analysis method
    Opis:
    The paper presents a detailed theoretical background for coordinate measurement uncertainty evaluation by means of Type B evaluation method, taking into account information on accuracy of a coordinate measuring system given with the formula for maximum permissible errors of length measurement and verification test results. A proposal for evaluation of the verification test results is made. A measurement model based on the point-plane distance equation is presented. A detailed analysis of the partial derivatives (sensitivity factors in an uncertainty budget) of the measurement model is presented. The analyses of measurement uncertainty for different geometrical characteristics were conducted using this measurement model. Examples of uncertainty evaluation for geometrical deviations are presented: position of a point related to a datum plane and flatness in the case of convex or concave surfaces. The examples include detailed uncertainty budgets.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 4; 625-639
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A polytomous item response theory models using R
    Politomiczne modele teorii odpowiedzi na pozycje testowe w programie R.
    Autorzy:
    Brzezińska, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/425272.pdf
    Data publikacji:
    2016
    Wydawca:
    Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
    Tematy:
    IRT models
    multidimensional IRT models
    measurement theory
    R software
    Opis:
    Item response theory (IRT) is widely used in educational and psychological research to model how participants respond to test items in isolation and in bundles. Item response theory has replaced classical measurement theory as a framework for test development, scale constructions, scree reporting and test evaluation. The most popular of the item response models for multiple choice tests are the one-parameter (i. e. the Rasch model) and threeparameter models. This is the general framework for specifying the functional relationship between a respondent’s underlying latent trait level, commonly known as ability in educational testing, or the factor score in the factor analysis tradition and an item level stimulus. In this paper, arguments are offered for continuing research and applying multidimensional IRT models. The position is also taken that multi-parameter IRT models have potentially important roles to play in the advancement of measurement theory about which models to use should depend on model fit to the test data. All calculations are conducted in R available from CRAN which is a widely-used and well-known environment for statistical computing and graphics.
    Źródło:
    Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 2 (52); 43-52
    1507-3866
    Pojawia się w:
    Econometrics. Ekonometria. Advances in Applied Data Analytics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermovision in the validation process of numerical simulation of braking
    Autorzy:
    Baranowski, P.
    Damaziak, K.
    Malachowski, J.
    Mazurkiewicz, L.
    Polakowski, H.
    Piatkowski, T.
    Kastek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220945.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermovision
    numerical models validation
    temperature measurement
    Opis:
    This article presents the validation process of a brake FE model by means of temperature measured on a special stand using infrared technology. Unlike many other publications, the authors try to show the interaction between measurement technology and numerical modeling rather than only nice, perfectly correlated graphs. Some difficulties in choosing and using validation parameters are also pointed out and discussed. Finally, results of FE analyses are compared with measured data, followed by explanation of applied numerical technology and estimation of validation process effectiveness.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 329-340
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Discretization Method of Continuous-Time Dynamic Linear Model
    Autorzy:
    Gryś, Sławomir
    Minkina, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/27311915.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sensor dynamics
    compensation
    discrete models
    temperature measurement
    Opis:
    The article presents a new discretization method of a continuous-time linear model of sensor dynamics. It can be useful to reduce measuring errors related to the inertia of the sensor. For example it is important in the measurement of rapid processes as temperature changes in combustion chambers, or for shortening the time needed to establish the sensor readings in a transition state. There is assumed that sensor dynamics can be approximated by linear differential equation or transfer function. The searched coefficients of equivalent difference equation or discrete transfer function are obtained from Taylor expansion of a sensor output signal and then on the solution of the linear set of equations. The method does not require decomposition of sensor transfer function for zeros and poles and can be applied to the case of transfer function with zeros equal to zero. The method was used to compensate the dynamics of sensor measuring fast signals. The Bode characteristics of a compensator were compared with others derived using classical methods of discretization of linear models. Additionally, signals in time were presented to show the dynamic error before and after compensation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 2; 281--286
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of gas bubble formation at the nozzle outlet
    Badanie procesu tworzenia się pęcherzyków gazu u wylotu z dyszy
    Autorzy:
    Rząsa, M. R.
    Boguniewicz-Zabłocka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/388340.pdf
    Data publikacji:
    2014
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    bubble formation
    mathematical models
    bubble volume measurement
    tworzenie pęcherzyków gazu
    modelowanie matematyczne
    pomiar objętości pęcherzy
    Opis:
    The paper presented a short literature review of theoretical models of formation of gas bubbles. On this basis, was prepare a classification of model. In the next step, experimental research was conducted, on the basis of which three were selected basic structure of the formation of bubbles. On the next step Then presents the results of experimental studies on the basis of which three were selected basic structure of the formation of bubbles. The classifications of bubble formation structures were expressed by Eötvös and Reynolds numbers. Furthermore, on this basis, were constructed a map of the structures forming bubbles. This paper presents a measurement method used for determination of parameters of bubbles forming at jet attachment from which the bubbles are displaced upward.
    Praca zawiera krótki przegląd literaturowy modeli teoretycznych tworzenia się pęcherzyków gazu. Na tej podstawie przeprowadzono klasyfikację modeli. Następnie przedstawiono wyniki badań eksperymentalnych, na podstawie których wyłoniono trzy podstawowe struktury tworzenia się pęcherzyków. Klasyfikacje struktur oparto na liczbach kryterialnych Reynoldsa oraz Eötvösa. Posłużyło to do opracowania map struktur tworzenia się pęcherzyków. Ponadto w pracy przedstawiono metodę pomiarową do wyznaczania objętości tworzących się pęcherzyków gazu.
    Źródło:
    Ecological Chemistry and Engineering. A; 2014, 21, 4; 493-502
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lorentz force eddy current testing: validation of numerical results
    Testowanie wiroprądowe w oparciu o pomiar siły Lorentza
    Autorzy:
    Uhlig, R.P.
    Zec, M.
    Ziolkowski, M.
    Brauer, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/159341.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    stan stały
    pomiar nieniszczący
    wady
    model analityczny
    model numeryczny
    symulacja
    metoda elementów skończonych
    solid state specimens
    non-destructive measurement
    defects
    analytical models
    numerical models
    simulation
    finite element method
    Opis:
    The paper at hand reports investigations regarding the characterization of an a electrically conducting solid state specimen with a new non-destructive measurement technique for the detection of subsurface defects. On the one hand it is necessary to characterize a specimen without defects in order to detect defects, on the other hand we show the validation of the analytical and numerical models that are used to simulate the application.
    Artykuł opisuje badania charakteryzujące elektrycznie przewodzącą próbkę w stanie stałym przy użyciu nowej nieniszczącej techniki pomiarowej w celu detekcji defektów podpowierzchniowych
    Źródło:
    Prace Instytutu Elektrotechniki; 2011, 251; 135-145
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Manoeuvring Criteria for Safety Assessment in Shallow Water
    Autorzy:
    Nakamura, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/116979.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    shallow water
    ships manoeuvering
    safety assessment
    manoeuvring criteria
    navigational safety assessment
    mathematical models
    navigational simulation
    measurement of motion conditions
    Opis:
    The necessity of verifying manoeuvring mathematical models in shallow water for studying the safety of ships using a ship-handling simulator is pointed out in this report. Several instances of verification of mathematical models in shallow water are introduced here based on measurements of motion conditions of full-scale ships and shallow water tank tests of models. Results of safety assessment tests of five manoeuvring phases are given using the verified manoeuvring mathematical models to discuss manoeuvring criteria in shallow water. Objective manoeuvring criteria for safety assessment in shallow water are proposed based on subjective judgement related to control margin assessed by more than 3,200 masters and pilots for over 325 simulation tests and by analysis of the study results of 15 full-scale ships.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 401-407
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Optimized Propagation Model based on Measurement Data for Indoor Environments
    Autorzy:
    Morocho-Yaguana, M.
    Ludeňa-González, P.
    Sandoval, F.
    Poma-Vélez, B.
    Erreyes-Dota, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/308451.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    indoor
    ITU model
    log-distance model
    loss measurement
    one-slope model
    path loss
    propagation measurements
    propagation models
    radio propagation
    Opis:
    Propagation is an essential factor ensuring good coverage of wireless communications systems. Propagation models are used to predict losses in the path between transmitter and receiver nodes. They are usually defined for general conditions. Therefore, their results are not always adapted to the behavior of real signals in a specific environment. The main goal of this work is to propose a new model adjusting the loss coefficients based on empirical data, which can be applied in an indoor university campus environment. The Oneslope, Log-distance and ITU models are described to provide a mathematical base. An extensive measurement campaign is performed based on a strict methodology considering different cases in typical indoor scenarios. New loss parameter values are defined to adjust the mathematical model to the behavior of real signals in the campus environment. The experimental results show that the model proposed offers an attenuation average error of 2.5% with respect to the losses measured. In addition, comparison of the proposed model with existing solutions shows that it decreases the average error significantly for all scenarios under evaluation.
    Źródło:
    Journal of Telecommunications and Information Technology; 2018, 2; 69-75
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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