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Wyszukujesz frazę "Bylina, J." wg kryterium: Autor


Wyświetlanie 1-11 z 11
Tytuł:
Studying OpenMP thread mapping for parallel linear algebra kernels on multicore system
Autorzy:
Bylina, B.
Bylina, J.
Powiązania:
https://bibliotekanauki.pl/articles/200778.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computation performance
OpenMP standard
nonnegative matrix factorization
thread mapping
energy consumption
wydajność obliczeniowa
Standard OpenMP
nieujemna faktoryzacja macierzy
mapowanie
zużycie energii
Opis:
Thread mapping is one of the techniques which allow for efficient exploiting of the potential of modern multicore architectures. The aim of this paper is to study the impact of thread mapping on the computing performance, the scalability, and the energy consumption for parallel dense linear algebra kernels on hierarchical shared memory multicore systems. We consider the basic application, namely a matrix-matrix product (GEMM), and two parallel matrix decompositions (LU and WZ). Both factorizations exploit parallel BLAS (basic linear algebra subprograms) operations, among others GEMM. We compare differences between various thread mapping strategies for these applications. Our results show that the choice of thread mapping has the measurable impact on the performance, the scalability, and energy consumption of the GEMM and two matrix factorizations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 6; 981-990
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of preconditioning and blocking on accuracy in solving Markovian models
Autorzy:
Bylina, B.
Bylina, J.
Powiązania:
https://bibliotekanauki.pl/articles/907654.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
kondycjonowanie
równanie liniowe
metoda blokowania
łańcuch Markowa
rozkład WZ
preconditioning
linear equations
blocking methods
Markov chains
WZ factorization
Opis:
The article considers the effectiveness of various methods used to solve systems of linear equations (which emerge while modeling computer networks and systems with Markov chains) and the practical influence of the methods applied on accuracy. The paper considers some hybrids of both direct and iterative methods. Two varieties of the Gauss elimination will be considered as an example of direct methods: the LU factorization method and the WZ factorization method. The Gauss-Seidel iterative method will be discussed. The paper also shows preconditioning (with the use of incomplete Gauss elimination) and dividing the matrix into blocks where blocks are solved applying direct methods. The motivation for such hybrids is a very high condition number (which is bad) for coefficient matrices occuring in Markov chains and, thus, slow convergence of traditional iterative methods. Also, the blocking, preconditioning and merging of both are analysed. The paper presents the impact of linked methods on both the time and accuracy of finding vector probability. The results of an experiment are given for two groups of matrices: those derived from some very abstract Markovian models, and those from a general 2D Markov chain.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 207-217
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational aspects of GPU - accelerated sparse matrix - vector multiplication for solving Markov models
Obliczeniowe aspekty mnożenia macierzy rzadkiej przez wektor dla rozwiązywania modeli Markowa przyspieszanego przez karty GPU
Autorzy:
Bylina, B.
Bylina, J.
Karwacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/375696.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Markovian models
wireless network models
GPU
matrix-vector multiplication
sparse matrices
Opis:
In this article we investigate some computational aspects of GPU-accelerated matrix-vector multiplication where matrix is sparse. Particularly, we deal with sparse matrices appearing in modelling with Markovian queuing models. The model we use for research is a Markovian queuing model of a wireless device. This model describes the device’s behavior during possible channel occupation by other devices. We study the efficiency of multiplication of a sparse matrix by a dense vector with the use of an appropriate, ready-to-use GPU-accelerated mathematical library, namely CUSP. For the CUSP library we discuss data structures and their impact on the CUDA platform for the fine-grained parallel architecture of the GPU. Our aim is to find the best format for storing a sparse matrix for GPU-computation (especially one associated with the Markovian model of a wireless device). We compare the time, the performance and the speed-up for the card NVIDIA Tesla C2050 (with ECC ON). For unstructured matrices (as our Markovian matrices), we observe speed-ups (in respect to CPU-only computations) of over 8 times.
Łańcuchy Markowa są przydatnym narzędziem do modelowania systemów złożonych, takich jak systemy i sieci komputerowe. W ostatnich latach łańcuchy Markowa zostały z powodzeniem wykorzystane do oceny pracy sieci bezprzewodowych. Jednym z problemów jaki się pojawia przy wykorzystywaniu łańcuchów Markowa w modelowaniu sieci są problemy natury obliczeniowej. W artykule zajmiemy się badaniem mnożenia macierzy rzadkiej przez wektor, które jest jedną z głównych operacji podczas numerycznego rozwiązywania modeli Markowowskich. Aby, przyspieszyć czas obliczeń mnożenia macierz rzadkiej przez wektor wykorzystano funkcje z biblioteki CUSP. Biblioteka jest zbiorem funkcji wykonywanych na GPU (ang.Graphics Processing Unit) celem skrócenia czasu obliczeń. Do testowania operacji mnożenia macierzy rzadkiej przez wektor badano macierze z Markowowskiego modelu pracy sieci bezprzewodowej. Model ten opisuje zachowanie urządzenia, gdy kanał transmisyjnych może być zajęty przez inne urządzenia. Macierz przejść wspomnianego modelu jest macierzą rzadką i potrzeba specialnej struktury danych do jej przechowywania, dlatego w artykule dyskutowane są różne struktury danych dla macierzy rzadkich i ich przydatność do obliczen na kartach graficznych. W pracy porównano czas, wydajność i przyspieszenie jakie otrzymano podczas testowania biblioteki CUSP na karcie NVIDIA Tesla C2050 dla niestrukturalnych macierzy rzadkich opisujących model zajętości węzła w sieciach bezprzewodowych przy różnych formatach przechowywania macierzy rzadkich. Dla testowanych macierzy zauważono ośmiokrotne przyspieszenie obliczeń przy wykorzystaniu karty graficznej.
Źródło:
Theoretical and Applied Informatics; 2011, 23, 2; 127-145
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alcohol drinking patterns and habits among a sample of PONS study subjects: preliminary assessment
Autorzy:
Przewozniak, K.
Lobaszewski, J.
Wojtyla, A.
Bylina, J.
Manczuk, M.
Zatonski, W.A.
Powiązania:
https://bibliotekanauki.pl/articles/51801.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Tematy:
alcohol drinking
habit
PONS project
drinking habit
Polska
human disease
risk factor
Źródło:
Annals of Agricultural and Environmental Medicine; 2011, 18, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patterns of leisure time physical activity and its determinants among a sample of adults from Kielce region, Poland – the ‘PONS’ study
Autorzy:
Lobaszewski, J.
Przewozniak, K.
Zatonska, K.
Wojtyla, A.
Bylina, J.
Manczuk, M.
Zatonski, W.A.
Powiązania:
https://bibliotekanauki.pl/articles/51985.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Tematy:
leisure time
physical activity
determinant
adult
Kielce region
Polska
PONS project
health survey
questionnaire research
Źródło:
Annals of Agricultural and Environmental Medicine; 2011, 18, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wet age-related macular degeneration (wet AMD) in rural and urban inhabitants in south-eastern Poland
Autorzy:
Latalska, M.
Matysik-Wozniak, A.
Bylina, J.
Latalski, M.
Rejdak, R.
Mackiewicz, J.
Jarosz, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/50461.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Change of situation of a family with a child treated due to scoliosis
Autorzy:
Latalski, M.
Kuzaka, R.
Fatyga, M.
Bylina, J.
Trzpis, T.
Jarosz, M.J.
Latalska, M.
Gregosiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/49530.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-economic conditionings of families with children treated due to scoliosis in Eastern Poland
Autorzy:
Latalski, M.
Fatyga, M.
Kuzaka, R.
Bylina, J.
Trzpis, T.
Kopytiuk, R.
Jarosz, M.J.
Latalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/50968.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk factors of postural defects in children at school age
Autorzy:
Latalski, M.
Bylina, J.
Fatyga, M.
Repko, M.
Filipovic, M.
Jarosz, M.J.
Borowicz, K.B.
Matuszewski, L.
Trzpis, T.
Powiązania:
https://bibliotekanauki.pl/articles/52145.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction and objective: Postural defects increasingly more often concern children and adolescents at school age. The lack of prophylaxis and neglecting adequate procedures may lead to limitations of physical and motor abilities, back pain, or the development of severe spinal deformities. Recognition of the risk factors conducive to the occurrence of the disorder allows the creation of adequate conditions for the psychomotor development of children, as well as the elaboration and implementation of specified educational schemes directed at schools and parents. The study concerned determination of the risk factors for the development of postural defects in school age children. Material and methods: The study was conducted by means of a diagnostic survey. The study group covered 380 children aged 14 (175 girls (46.1%) and 205 boys (53.9%)) – selected at random from schools in eastern Poland and the Czech Republic. The significance of the relationships between variables was investigated by means of chi-square test for independence. The differences between the empirical and theoretical sample distribution was examined by means of chi-square goodnessof- fit test. The significance level was set at p=0.05. Results: The BMI in the population examined was 20.2, on average (from 14–39). Respondents living in rural areas and small towns constituted 57.63% of the study group, while inhabitants of medium-size and large cities – 42.37%. The majority of children in the study had been previously examined for the occurrence of postural defects (74.2%), whereas nearly every tenth child had never undergone such an examination. As many as 16.3% of adolescents did not know whether they had ever participated in a screening test. A defect was detected in 14.7% of children, in 56.6% no asymmetry was detected, while approximately 30% were not aware if their body posture was normal or not. Conclusions: 1. There is a relationship between physical activity of the child and the occurrence of postural defects. 2. There is a relationship between the economic standard of the family and awareness of own state of health. 3. There is a need for the creation of a system of education for parents and children concerning postural defects and risks resulting from these defects.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An evaluation of the genetic conditioning of evoking pain
Autorzy:
Pacian, A.B.
Kocki, J.
Pacian, J.
Kaczoruk, M.
Bylina, M.
Kaczor-Szkodny, P.
Galińska, E.M.
Kulik, T.
Panasiuk, L.
Powiązania:
https://bibliotekanauki.pl/articles/2085535.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
genetics
chronic pain
genes expression
DRD1 gene
molecular research
Opis:
Introduction and objective. Pain is an integral element of the pathogenic process and sometimes determines its course. Disorders in pain sensation, as well as its lack, the pain threshold, and variability in sensation of the same pain stimuli as more or less intensive by different persons, may be genetically conditioned. The aim of the study is to examine genes in pathogenesis of chronic pain. Materials and method. The study was conducted in a specially selected group of 31 persons: study group – 20 patients with chronic pain, and control group – 11 healthy individuals who did not experience pain. The control group of 11 healthy persons, compared with the study group, was the catalyst for determining the relative quantification (RQ) of gene expression. Biological material in the form of venous blood was collected from the study participants into the tubes containing anticoagulant EDTA KE/2.7 ml (ethylenediaminetetraacetic acid), preventing extracorporeal blood clotting. Results. Analysis of expression of the examined genes showed over-expression of the DRD1 gene in patients experiencing chronic pain, which means that in these patients an increased number of dopamine D1 receptors encoded by this gene should be expected. The dopamine D1 receptor is a G-protein-coupled receptor which regulates (stimulates or inhibits) adenyl cyclase – the enzyme responsible for synthesis of cyclic AMP (cAMP). An increase in the concentration of cAMP in neurons enhances the sensation of pain. Conclusions. The genes (DRD1, COMT, OPRK1, HCN2) have a significant role in the pathogenesis of chronic pain in various diseases; they can also influence the perception of pain. Knowledge of these genes can contribute to the development of effective methods of combating pain.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 2; 274-278
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imidazole-induced contractility of vascular smooth muscle cells in the presence of U-73122, ODQ, indomethacin and 7-nitroindazole
Autorzy:
Wicinski, M.
Grzesk, G.
Malinowski, B.
Grzesk, E.
Sinjab, A.T.
Krzyzanowski, M.
Michalska, A.
Bylina, D.
Dzieciol, J.
Szadujkis-Szadurska, K.
Czeczuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/32360.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of the study was to assess the impact of modulating factors on vascular smooth muscle cells reactivity. Vascular resistance was induced by the administration of increasing concentrations of imidazole. The experiments were performed on isolated and perfused tail artery of Wistar rats (weight 250 g – 350 g). Rats were been narcotized by urethane (intraperitoneal injection) at a dose of 120 mg/kg, stunned and then sacrificed by cervical dislocation. In the following investigation classical pharmacometric methods were used. Relationships between concentration-response curves (CRCs) for imidazole observed in the presence of ODQ [(1H-(1,2,4)oxadiazolo-[4,3-a]quinoxalin-1-one)], 7-nitroindazole and indomethacin were analyzed. Imidazole-induced contractility of vascular smooth muscle cells was independent from alpha-adrenergic receptors and PLC activity. Reactivity of VSMCsinduced by imidazole, was significantly changed in the presence of ODQ and 7-nitroindazole.
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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