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    Wyświetlanie 1-13 z 13
    Tytuł:
    Long-term Traffic Forecasting in Optical Networks Using Machine Learning
    Autorzy:
    Walkowiak, Krzysztof
    Szostak, Daniel
    Włodarczyk, Adam
    Kasprzak, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/27311948.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    traffic forecasting
    machine learning
    classification
    Regression
    Opis:
    Knowledge about future traffic in backbone optical networks may greatly improve a range of tasks that Communications Service Providers (CSPs) have to face. This work proposes a procedure for long-term traffic forecasting in optical networks. We formulate a long-terT traffic forecasting problem as an ordinal classification task. Due to the optical networks’ (and other network technologies’) characteristics, traffic forecasting has been realized by predicting future traffic levels rather than the exact traffic volume. We examine different machine learning (ML) algorithms and compare them with time series algorithms methods. To evaluate the developed ML models, we use a quality metric, which considers the network resource usage. Datasets used during research are based on real traffic patterns presented by Internet Exchange Point in Seattle. Our study shows that ML algorithms employed for long-term traffic forecasting problem obtain high values of quality metrics. Additionally, the final choice of the ML algorithm for the forecasting task should depend on CSPs expectations.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 4; 751--762
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obciążenie cieplne ceramicznego filtra sadzy
    Autorzy:
    Dudek, Krzysztof.
    Walkowiak, Wojciech.
    Powiązania:
    W: Alternatywne paliwa pochodzenia roślinnego do silników wozów bojowych : problemy eksploatacji zespołów napędowych pojazdów wojskowych : KONSSPAL 2000 / red. nauk. Mieczysław Struś ; Wyższa Szkoła Inżynierska im. Tadeusza Kościuszki Wrocław : WSO s. 43-46
    Współwytwórcy:
    Struś, Mieczysław. Redakcja
    Data publikacji:
    4346
    Tematy:
    Filtr sadzy regeneracja materiały konferencyjne
    Filtracja urządzenia materiały konferencyjne
    Silniki spalinowe materiały konferencyjne
    Termografia i termowizja materiały konferencyjne
    Pojazdy wojskowe napęd materiały konferencyjne
    Opis:
    Rys., tab.; Bibliogr.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    In situ-formed bacterial exopolysaccharide (EPS) as a potential carrier for anchorage-dependent cell cultures
    Autorzy:
    Komorowski, Piotr
    Kołodziejczyk, Agnieszka
    Makowski, Krzysztof
    Kotarba, Sylwia
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844871.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    bacterial exopolysaccharides
    dextran- -based “microcarriers”
    scanning electron microscopy
    atomic force microscopy
    roughness parameters
    three-dimensional cell culture
    Opis:
    The study involved the use of a bacterial strain isolated from environmental samples which produce the biopolymer in the form of pellets in the submerged culture. This material (bacterial exopolysaccharide) is produced by bacteria of the Komogateibacter xylinus which are prevalent in the environment. The aim of this study was to characterize bacterial exopolysaccharides and commercial dextran-based “microcarriers” in terms of their roughness and cell culture effects, including the morphology and viability of the human hybridoma vascular endothelial cell line EA.hy926. The pellets were characterized using scanning electron microscopy (SEM) and atomic for¬ce microscopy (AFM). The resulting structures were used for cell culture of adherent cells (anchorage¬-dependent cells). At the same time, the cultures with commercial, dextran-based “microcarriers” were carried out for comparative purposes. After com¬pletion of the cell culture (24 hours of culture), the cellulose and commercial “carriers” were analyzed using SEM and AFM. Finally, the obtained cell dens¬ities (fluorescence labelling) and their morphological characteristics (SEM) were compared. The obtained results strongly support the applicability of bacterial exopolysaccharide (EPS) in tissue engineering to build innovative 3D scaffolds for cell culture, the more so that it is technologically possible to produce EPS as spatially complex structure
    Źródło:
    Engineering of Biomaterials; 2021, 24, 159; 18-23
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification and characterization of microbiological contamination sources in the environment of production of personalized femoral implant
    Autorzy:
    Gniada, Natalia
    Leszczewicz, Martyna
    Makowski, Krzysztof
    Komorowski, Piotr
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844919.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    implants
    microbiology
    microorganisms
    implanty
    mikrobiologia
    mikroorganizmy
    Źródło:
    Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 47
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological and biochemical features of microorganisms inhabiting the surfaces of personalized femoral implants
    Autorzy:
    Leszczewicz, Martyna
    Gniada, Natalia
    Makowski, Krzysztof
    Komorowski, Piotr
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844905.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    microorganisms
    implants
    sterilization
    mikroorganizmy
    implanty
    sterylizacja
    Źródło:
    Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 46
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and manufacture of customized medical implants - final report
    Autorzy:
    Elgalal, Marcin
    Komorowski, Piotr
    Makowski, Krzysztof
    Styczyński, Andrzej
    Rokita, Bożena
    Kubiak, Tomasz
    Sawicki, Jacek
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844816.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Źródło:
    Engineering of Biomaterials; 2021, 24, 163; 24
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and manufacture of customized medical implants - continued
    Autorzy:
    Elgalal, Marcin
    Komorowski, Piotr
    Makowski, Krzysztof
    Styczyński, Andrzej
    Ulański, Piotr
    Kubiak, Tomasz
    Sawicki, Jacek
    Domżalski, Marcin
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/283931.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Źródło:
    Engineering of Biomaterials; 2019, 22, no.153; 100
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and manufacture of customized medical implants - third report
    Autorzy:
    Elgalal, Marcin
    Komorowski, Piotr
    Makowski, Krzysztof
    Styczyński, Andrzej
    Ulański, Piotr
    Kubiak, Tomasz
    Sawicki, Jacek
    Domżalski, Marcin
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844948.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    implants
    design
    manufacture
    implanty
    projektowanie
    wykonanie
    Źródło:
    Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 31
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microscopic analysis of the nanostructures impact on endothelial cells
    Autorzy:
    Kołodziejczyk, Agnieszka Maria
    Kucińska, Magdalena
    Jakubowska, Aleksandra
    Siatkowska, Małgorzata
    Sokołowska, Paulina
    Kotarba, Sylwia
    Makowski, Krzysztof
    Komorowski, Piotr
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844983.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    nanostructures
    atomic force microscopy
    transmission electron microscopy
    scanning electron microscopy
    cell morphology
    Opis:
    Nowadays nanostructures are more and more often designed as carriers for drug delivery, especially to improve the drug pharmacokinetics and pharmaco-dynamics. Numerous kinds of nanostructures are considered a good prospect for medical applications thanks to their small size, acceptable biocompatibility and toxicity. Due to the fact that nanotechnology is a new field of science, every nano-scale product must be thoroughly examined regarding its toxicity to the human body. This study provides new insights into effects of exposing endothelial cells to the selected nanostructures. Dendrimers of the fourth generation (PAMAMs), multi-walled carbon nanotubes (MWCNTs) and silver nanoparticles (SNPs) were used to evaluate nanostructures influence on endothelial cells in vitro. The nanostructures were evaluated via transmission electron microscopy and dynamic light scattering technique. The cells previously exposed to the nanostructures were observed and analyzed via the atomic force microscopy and scanning electron microscopy to obtain a quantitative evaluation of the cells morphology. The presence of multi-walled carbon nanotubes and silver nanoparticles on the cells surface was confirmed by the scanning electron microscopy. Our results confirm that the surface association and/or uptake of nanostructures by the cells resulting from physicochemical and biological processes, affect the cells morphology. Morphological changes can be induced by the membrane proteins interaction with nanomaterials, which trigger a sequence of intracel-lular biological processes.
    Źródło:
    Engineering of Biomaterials; 2020, 23, 154; 2-8
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microscopic analysis of the nanostructures impact on endothelial cells
    Autorzy:
    Kołodziejczyk, Agnieszka Maria
    Kucińska, Magdalena
    Jakubowska, Aleksandra
    Siatkowska, Małgorzata
    Sokołowska, Paulina
    Kotarba, Sylwia
    Makowski, Krzysztof
    Komorowski, Piotr
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/970974.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    nanostructures
    atomic force microscopy
    transmission electron microscopy
    scanning electron microscopy
    cell morphology
    Opis:
    Nowadays nanostructures are more and more often designed as carriers for drug delivery, especially to improve the drug pharmacokinetics and pharmaco-dynamics. Numerous kinds of nanostructures are considered a good prospect for medical applications thanks to their small size, acceptable biocompatibility and toxicity. Due to the fact that nanotechnology is a new field of science, every nano-scale product must be thoroughly examined regarding its toxicity to the human body. This study provides new insights into effects of exposing endothelial cells to the selected nanostructures. Dendrimers of the fourth generation (PAMAMs), multi-walled carbon nanotubes (MWCNTs) and silver nanoparticles (SNPs) were used to evaluate nanostructures influence on endothelial cells in vitro. The nanostructures were evaluated via transmission electron microscopy and dynamic light scattering technique. The cells previously exposed to the nanostructures were observed and analyzed via the atomic force microscopy and scanning electron microscopy to obtain a quantitative evaluation of the cells morphology. The presence of multi-walled carbon nanotubes and silver nanoparticles on the cells surface was confirmed by the scanning electron microscopy. Our results confirm that the surface association and/or uptake of nanostructures by the cells resulting from physicochemical and biological processes, affect the cells morphology. Morphological changes can be induced by the membrane proteins interaction with nanomaterials, which trigger a sequence of intracel-lular biological processes.
    Źródło:
    Engineering of Biomaterials; 2020, 23, 154; 2-8
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigations of the PMMA bone cement distribution inside a model of lumbar vertebrae
    Autorzy:
    Bonik, Artur
    Tyfa, Zbigniew
    Ciupik, Lechosław Franciszek
    Sobczak, Krzysztof
    Kierzkowska, Agnieszka
    Obidowski, Damian Stanisław
    Witkowski, Dariusz
    Pałczyński, Tomasz
    Elgalal, Marcin
    Komorowski, Piotr
    Słoński, Edward
    Jóźwik, Krzysztof
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/2232172.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    percutaneous vertebroplasty
    osteoporotic spinal fractures
    spinal cement injection
    cement distribution
    bone cement preparation
    Opis:
    The use of bone cement in procedures such as vertebroplasty and kyphoplasty can reduce pain and mechanically support the spine. This study aimed to evaluate whether air entrapped within bone cement affected its distribution in a vertebral body model. The study included 3D printed anatomical models of vertebrae together with their internal trabecular structure. Aeration was achieved by mixing the bone cement using three different altered procedures, whilst the control sample was prepared according to the manufacturer’s instructions. The further two samples were prepared by reducing or increasing the number of cycles required to mix the bone cement. A test rig was used to administer the prepared bone cement and introduce it into the vertebral model. Each time the injection was stopped when either the cement started to flow out of the vertebral model or when the entire cement volume was administered. The computer tomography (CT) scanning was performed to evaluate aerification and its influence on the bone cement distribution in each of the patient-specific models. The large number of small pores visible within the cement, especially in the cannula vicinity, indicated that the cement should not be treated as a homogenous liquid. These results suggest that a high level of aerification can influence the further cement distribution.
    Źródło:
    Engineering of Biomaterials; 2022, 25, 165; 23--30
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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