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Wyszukujesz frazę "Szkutnik, Z." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    A note on minimax rates of convergence in the Spektor-Lord-Willis problem
    Autorzy:
    Szkutnik, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/254773.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    poisson inverse problem
    rate minimaxity
    singular value decomposition
    stereology
    Opis:
    In this note, attainable lower bounds are constructed for the convergence rates in a stereological problem of unfolding spheres size distribution from linear sections, which shows that a spectral type estimator is strictly rate minimax over some Sobolev-type classes of functions.
    Źródło:
    Opuscula Mathematica; 2010, 30, 2; 203-207
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unfolding spheres size distribution from linear sections with B-splines and EMDS algorithm
    Autorzy:
    Szkutnik, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255515.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    inverse problem
    singular value expansion
    stereology
    discretization
    quasi-maximum likelihood estimator
    Opis:
    The stereological problem of unfolding spheres size distribution from linear sections is formulated as a problem of inverse estimation of a Poisson process intensity function. A singular value expansion of the corresponding integral operator is given. The theory of recently proposed B-spline sieved quasi-maximum likelihood estimators is modified to make it applicable to the current problem. Strong L2-consistency is proved and convergence rates are given. The estimators are implemented with the recently proposed EMDS algorithm. Promising performance of this new methodology in finite samples is illustrated with a numerical example. Data grouping effects are also discussed.
    Źródło:
    Opuscula Mathematica; 2007, 27, 1; 151-165
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On a dense minimizer of empirical risk in inverse problems
    Autorzy:
    Podlewski, J.
    Szkutnik, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/952841.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    inverse problem
    empirical risk minimization
    Opis:
    Properties of estimators of a functional parameter in an inverse problem setup are studied. We focus on estimators obtained through dense minimization (as opposed to minimization over δ-nets) of suitably defined empirical risk. At the cost of imposition of a sort of local finite-dimensionality assumption, we fill some gaps in the proofs of results published by Klemela and Mammen [Ann. Statist. 38 (2010), 482-511]. We also give examples of functional classes that satisfy the modified assumptions.
    Źródło:
    Opuscula Mathematica; 2016, 36, 5; 671-679
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uszkodzenia środowiska leśnego w wyniku turystyki i rekreacji
    Damage to the forest environment as a result of tourism and recreation
    Autorzy:
    Dudek, T.
    Szkutnik, P.
    Bilek, M.
    Olbrycht, T.
    Chmielowska, K.
    Dziuba, M.
    Czerniakowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/979229.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    turystyka
    rekreacja
    turystyka piesza
    lasy
    presja turystyczna
    szlaki piesze
    szlaki turystyczne
    uszkodzenia gleby
    oddziaływanie na środowisko
    uszkodzenia roślin
    forest recreation
    leisure time
    tourist pressure
    tourist trail
    Opis:
    The purpose of the paper was to determine the impact of the most popular form of recreation and tourism (i.e. walking) on the environment in selected forests that were made available by the means of educational trails. The research was carried out in south−eastern Poland, in the forest reserves Bór (RB) and Polanki (RP) as well as in the economic forests of the Kołaczyce (NK) and Brzozów (NB) forest districts. A 1−km−long transect was established on both sides along each educational trail with control points determined every 10 m. In total 200 points were distinguished and data on the degree of soil damage was collected at research plots with an area of 1 m2 each. Based on these 200 plots, damage of young trees and soil were measured. The studies indicate that the damage to the soil and trees in the immediate vicinity of the routes available for recreation and tourism are very large. In all objects, 53−99% of the soil surface and 28−56% of trees were damaged. Slightly damaged soil earned the highest fraction on all studied trails (for NK it was 62%, RB – 49%, RP – 35.5% and NB – 26.5%). The most severe soil damage (packed soil) was recorded in as many as 37% of the measurement points in RB, 9.5% in RP and NB and 7% in NK. The most common form of damage to the trees was bark rub without damaging the pulp or partial damage to the needles or leaves. In case of NK, such damage was observed in 41% of trees, while 30.4% of RB, NB in 20.9% and RP in 13.9%. Trees ranked as the 2 most severe degrees of damage accounted for as much as 9.2% in NK, while 7.2% of RP, 6.4% in RB and 5.6% in NB. The damage level of the examined components of the forest environment determined in the study as a result of tourist and recreational use should be considered as high.
    Źródło:
    Sylwan; 2020, 164, 02; 170-176
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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