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    Wyświetlanie 1-11 z 11
    Tytuł:
    Real-time Segmentation of Yarn Images Based on an FCM Algorithm and Intensity Gradient Analysis
    Segmentacja obrazu przędzy oparta na algorytmie FCM i analizie gradientu intensywności
    Autorzy:
    Li, Z.
    Pan, R.
    Wang, J.
    Wang, Z.
    Li, B.
    Gao, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/233569.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    real-time segmentation
    image processing
    yarn evenness
    FCM algorithm
    gradient analysis
    segmentacja w czasie rzeczywistym
    przetwarzanie obrazu
    algorytm FCM
    analiza gradientu
    Opis:
    This paper presents a new method for real-time segmentation of yarn images which are captured by a real-time image acquisition device. The first frame of the images is clustered by the local average intensity and entropy of the image based on the FCM (Fuzzy C-means) algorithm to obtain a segmentation threshold value. The pixels with an intensity below the threshold value in each column of the image are convolved with a convolve template to construct an intensity gradient curve. The points of maximum value and minimum value in the curve are considered as the upper and lower edge points of yarn. A robust real-time segmentation algorithm of yarn images is obtained for evaluating yarn diameter more precisely. Finally two indices of SE (Segmentation Error) in % and ADE (Average Diameter Error) in % are proposed to evaluate the segmentation method, which is then compared with the manual method.
    Artykuł dotyczy oceny przeprowadzonej w czasie rzeczywistym segmentacji obrazów w oparciu o rozmyty algorytm C-średnich i analizę intensywności gradientu. Zaproponowano metodę segmentacji obrazów przędzy mającą na celu zwiększenie dokładności pomiarów jej średnicy, a w zamierzeniach wpłynięcie na zwiększenie dokładności oceny jej nierównomierności. W tym celu zaprojektowano stanowisko badawcze, umożliwiające rejestrację obrazów przędzy wykonaną w czasie rzeczywistym, z bardzo dużą częstotliwością rejestracji kadrów zdjęć. Na tej podstawie przeprowadzono obliczenia obejmujące między innymi minimalizację rozmytej funkcji celu, lokalną charakterystykę intensywności obrazu, a także jednowymiarowy splot wykorzystane do wykrywania krawędzi rozpatrywanej przędzy. Uzyskane rezultaty proponowanej metody skonfrontowano z rezultatami przewidywanymi za pośrednictwem tradycyjnych metod. W szczególności w celach porównawczych uwzględniono progowanie Otsu i grupowanie za pośrednictwem algorytmu FCM, a także Region Growing Algorithm.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 4 (118); 45-50
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On stability analysis in shape optimisation : critical shapes for Neumann problem
    Autorzy:
    Dambrine, M.
    Sokolowski, J.
    Żochowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970525.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja kształtu
    analiza stabilności
    gradient kształtu
    shape optimisation
    stability analysis
    shape gradient
    shape Hessian
    Opis:
    The stability issue of critical shapes for shape optimization problems with the state function given by a solution to the Neumann problem for the Laplace equation is considered. To this end, the properties of the shape Hessian evaluated at critical shapes are analysed. First, it is proved that the stability cannot be expected for the model problem. Then, the new estimates for the shape Hessian are derived in order to overcome the classical two norms-discrepancy well know in control problems, Malanowski (2001). In the context of shape optimization, the situation is similar compared to control problems, actually, the shape Hessian can be coercive only in the norm strictly weaker with respect to the norm of the second order differentiability of the shape functional. In addition, it is shown that an appropriate regularization makes possible the stability of critical shapes.
    Źródło:
    Control and Cybernetics; 2003, 32, 3; 503-528
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nontrivial variations of morpho-anatomical leaf traits in natural south-eastern populations of vaccinium species from Central Balkans
    Autorzy:
    Bjedov, I.
    Obratov-Petkovic, D.
    Rakonjac, V.
    Skocajic, D.
    Bojovic, S.
    Markovic, M.
    Dajic-Stevanovic, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2142112.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Analysis of Variance
    climate factors
    Cluster Analysis
    elevational gradient
    Principal Component Analysis
    Serbia
    intraspecific and interspecific variability
    Opis:
    Morpho-anatomical characteristics of Vaccinium myrtillus, V. uliginosum and V. vitis-idaea leaves from several sites of the Central Balkans were examined. The aim of this study was to investigate for the first time morpho-anatomical leaf traits of these species in the studied populations and to identify traits that follow a specific trend along the gradients of climate factors. Leaf traits that discriminate Vaccinium species were as follows: depth of the adaxial cuticule (AdC), thickness of the palisade tissue (PT), thickness of the spongy tissue (ST), height of the abaxial epidermal cells (AbE), height of the abaxial cuticule (AbC) and leaf thickness (LT). Populations of V. myrtillus were characterized by the smallest, and populations of V. vitis-idaea by the highest values for AdC, PT, ST, AbE and LT. Additionally, AbC was significantly larger for V. uliginosum in comparison to two other species. On the basis of morpho-anatomical traits, intraspecific variability of the studied species was explored by Principal Component Analysis (PCA), Cluster Analysis (CA) and Analysis of Variance (ANOVA). CA based on 10 morpho-anatomical traits showed that populations of V. myrtillus and V. uliginosum that grew at lower altitudes (characterized by higher mean annual temperature) are more similar to each other. Especially V. myrtillus was responsive to the elevational gradient and exhibited the highest plasticity in morpho-anatomical leaf traits. Populations of V. vitis-idaea had a different pattern of differentiation along the elevational gradient. CA showed that the populations at the lowest and at the highest altitudes were more similar according to the morpho-anatomical leaf traits, meaning that evergreen leaves were more resistant to environmental conditions.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2021, 63, 2; 7-16
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forced nonlinear vibrations in a smart magneto-viscoelastic multiscale composite nanobeam in a humid thermal environment
    Autorzy:
    Anitha, Lakshmanan
    Rajalakshmi, Loganathan
    Selvamani, Rajendran
    Ebrahimi, Farzad
    Powiązania:
    https://bibliotekanauki.pl/articles/38911353.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    piezoelectric nanobeam
    vibration analysis
    viscoelastic damping
    nonlocal strain gradient
    magneto-electro-viscoelastic
    Opis:
    In this paper, we study forced harmonic waves in a magneto-electro-viscoelastic (MEV) nanobeam embedded in a viscoelastic foundation using nonlocal strain gradient elasticity theory. The viscoelastic foundation is modeled as a Winkler-Pasternak layer. The governing equations of the nonlocal strain gradient viscoelastic nanobeam are derived using Hamilton’s principle and solved analytically. A parametric study is presented to examine the effects of physical variables on the field. It is found that the effect of strain gradient and nonlocal parameter on dimensionless amplitude and phase angle is quite important. The findings from this study highlight the significance of identifying magneto-piezoelectricity in predicting the vibration characteristics of intelligent nanostructures and elucidating the impact of humid thermal effects on nanomaterials.
    Źródło:
    Engineering Transactions; 2023, 71, 4; 617-644
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convergence Analysis for Principal Component Flows
    Autorzy:
    Yoshizawa, S.
    Helmke, U.
    Starkov, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/908317.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    badanie zbieżności
    sieć neuronowa
    principal component analysis
    neural networks
    gradient flows
    phase portrait
    Hessians
    Opis:
    A common framework for analyzing the global convergence of several flows for principal component analysis is developed. It is shown that flows proposed by Brockett, Oja, Xu and others are all gradient flows and the global convergence of these flows to single equilibrium points is established. The signature of the Hessian at each critical point is determined.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 223-236
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of physicochemical parameters on zooplankton in the brackish, coastal Vistula Lagoon
    Autorzy:
    Paturej, E.
    Gutkowska, A.
    Koszalka, J.
    Bowszys, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48536.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    physicochemical parameter
    zooplankton
    brackish water
    Vistula Lagoon
    environment condition
    canonical correspondence analysis
    temperature
    salinity gradient
    Opis:
    This paper analyzes whether physicochemical properties significantly influence the occurrence of zooplankton in a brackish reservoir. The studies were carried out on the Vistula Lagoon in August and September from 2006 to 2009 at 32 research sites. The environmental conditions in the Vistula Lagoon varied widely. At the time of the investigation, 17 species of rotifers, six species of Cladocera, and ten species of Copepoda were noted, and the total density of plankton fauna ranged from 145 to 765 ind. dm3. Statistical analysis demonstrated a significant correlation between the occurrence of some zooplankton species and certain environmental parameters, whereas the sampling sites were grouped according to study years. The zooplankton systems recorded at the research sites in 2006 constitute the most disparate group. Thus, it can be concluded that physicochemical properties might significantly impact both individual species (depending on their environmental demands) and entire zooplankton clusters.
    Źródło:
    Oceanologia; 2017, 59, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Causes of periodical rainfall distribution and long-term forecast of precipitation for Lankaran, Azerbaijan
    Autorzy:
    Mammadov, A.
    Rajabov, R.
    Casanova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/108455.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    rainfall distribution
    synoptic processes
    atmospheric forces
    harmonic analysis
    baric gradient
    opady
    rozkład opadów
    prognoza długoterminowa
    Azerbejdżan
    Opis:
    Irregular rainfall distribution is receiving considerable attention. The amount of rainfall for one region can account for 500-600 mm, sometimes 1000 mm. For example, in the year 1985, Zagtala in Azerbaijan received 716 mm of rainfall, while in 1988, 2004 and 2008 - 1151, 1306 and 661 mm, respectively, were measured. In Lankaran 2061 mm were measured in 1982 and 470 mm in 1999. Generally, rainfall distribution differs across the Republic of Azerbaijan. In this study, the physical side of such variations was clarified. In relation to that, the movement speed of the atmosphere in regard of the rotation of the Earth was analyzed, showing that the difference in rainfall distribution, according to the time structure, is connected to the direction change of the atmospheric movement. Generally, the reasons for atmospheric movements cannot be identified as the rotation movement of the earth, mainly because both environments show different activities. While the processes happening in the atmosphere often change, influenced by the pressure gradient, the rotation movement of the earth is more stationary. We also evaluated the rainfall forecast method for the region Lankaran. Taking into account its simplicity, the Shuster method was used. Observation data was divided into stationary and casual elements. Selection of periodicals was determined by separation of long term meteorological data into harmonic functions. By accepting the variation, the coefficient casual item was added.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2018, 6, 2; 39-43
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isospectral integrability analysis of dynamical systems on discrete manifolds
    Autorzy:
    Blackmore, D.
    Prykarpatsky, A. K.
    Prykarpatsky, Y. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/255384.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    gradient holonomic algorithm
    conservation laws
    asymptotic analysis
    Poissonian structures
    Lax representation
    finite dimensional reduction
    Liouville integrability
    nonlinear discrete dynamical systems
    Opis:
    It is shown how functional-analytic gradient-holonomic structures can be used for an isospectral integrability analysis of nonlinear dynamical systems on discrete manifolds. The approach developed is applied to obtain detailed proofs of the integrability of the discrete nonlinear Schrödinger, Ragnisco-Tu and Riemann-Burgers dynamical systems.
    Źródło:
    Opuscula Mathematica; 2012, 32, 1; 41-66
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ryszard Zieliński’s contribution to statistical optimization and fixed-precision estimation
    Autorzy:
    Męczarski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/747417.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    stochastic approximation, Kiefer-Wolfowitz procedure, gradient estimation, response surface analysis, simplex design, confidence set, stopping rule, fixed-precision estimation
    aproksymacja stochastyczna, procedura Kiefera\--Wol\-fowitza, estymacja gradientu, analiza powierzchni odpowiedzi, plan sympleksowy, zbiór ufności, reguła zatrzymania, estymacja stałoprecyzyjna
    Opis:
    W tej części opisane będą wyniki Profesora Ryszarda Zielińskiego w dziedzinie klasycznej aproksymacji stochastycznej, analizy powierzchni odpowiedzi oraz konstrukcji zbiorów ufności o zadanej precyzji.
    Professor Ryszard Zieliński's results in stochastic approximation, extremal experimental design in the framework of response surface analysis and fixed-precision set estimation are outlined. First, he proposed a randomized version of Fabian's (1967) gradient estimate in the Kiefer-Wolfowitz procedure, which reduced the number of required observations and improved the rate of convergence. Second, when considering response surface analysis and experimental designs for the gradient estimation, he constructed a randomized simplex design which resulted in the unbiased estimator. Third, he gave a method to construct confidence sets with prescribed accuracy (i. e. the width and the confidence level) by sampling independent copies of a process of interest. Professor Ryszard Zieliński's results in stochastic approximation, extremal experimental design in the framework of response surface analysis and fixed precision set estimation are outlined. First, he proposed a randomized version of Fabian's (1967) gradient estimate in the Kiefer-Wolfowitz procedure, which reduced the number of required observations and improved the rate of convergence. Second, when considering response surface analysis and experimental designs for the gradient estimation, he constructed a randomized simplex design which resulted in the unbiased estimator. Third, he gave a method to construct confidence sets with prescribedaccuracy (i. e. the width and the confidence level) by sampling independent copiesof a process of interest.
    Źródło:
    Mathematica Applicanda; 2012, 40, 2
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A complete gradient clustering algorithm formed with kernel estimators
    Autorzy:
    Kulczycki, P.
    Charytanowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/907781.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza danych
    eksploracja danych
    grupowanie
    metoda statystyczna
    estymacja jądrowa
    obliczenia numeryczne
    data analysis
    data mining
    clustering
    gradient procedures
    nonparametric statistical methods
    kernel estimators
    numerical calculations
    Opis:
    The aim of this paper is to provide a gradient clustering algorithm in its complete form, suitable for direct use without requiring a deeper statistical knowledge. The values of all parameters are effectively calculated using optimizing procedures. Moreover, an illustrative analysis of the meaning of particular parameters is shown, followed by the effects resulting from possible modifications with respect to their primarily assigned optimal values. The proposed algorithm does not demand strict assumptions regarding the desired number of clusters, which allows the obtained number to be better suited to a real data structure. Moreover, a feature specific to it is the possibility to influence the proportion between the number of clusters in areas where data elements are dense as opposed to their sparse regions. Finally, the algorithm-by the detection of one-element clusters-allows identifying atypical elements, which enables their elimination or possible designation to bigger clusters, thus increasing the homogeneity of the data set.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2010, 20, 1; 123-134
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Searching for optimal prestressing of steel bar structures based on sensitivity analysis
    Autorzy:
    Yurchenko, V. V.
    Peleshko, I. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/230774.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja parametryczna
    element zbędny
    siła sprężająca początkowa
    sprężenie optymalne
    analiza wrażliwości
    metoda rzutowania gradientowego
    parametric optimization
    redundant member
    initial prestressing force
    optimal prestressing
    sensitivity analysis
    gradient projection method
    Opis:
    The paper considers parametric optimization problems for the steel bar structures formulated as nonlinear programming ones with variable unknown cross-sectional sizes of the structural members, as well as initial prestressing forces introduced into the specified redundant members of the structure. The system of constraints covers load-bearing capacity constraints for all the design sections of the structural members subjected to all the design load combinations at ultimate limit state, as well as displacement constraints for the specified nodes of the bar system, subjected to all design load combinations at serviceability limit state. The method of the objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations has been used to solve the parametric optimization problem. A numerical technique to determine the optimal number of the redundant members to introduce the initial prestressing forces has been offered for high-order statically indeterminate bar structures. It reduces the dimension for the design variable vector of unknown initial prestressing forces for considered optimization problems.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 525-540
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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