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Tytuł:
Implementation of the parallel Arnoldi method in the IBM SP2 distributed memory system
Autorzy:
Rewieński, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1953483.pdf
Data publikacji:
1997
Wydawca:
Politechnika Gdańska
Opis:
The following article discusses the Implicitly Restarted Arnoldi Method used for solving large sparse eigenvalue problems. It presents the parallel implementation of this algorithm for a distributed memory architecture developed by Maschhoff and Sorensen ([1]) and included in the P_ARPACK library. The article gives results of performance tests of the P_ARPACK subroutines in the IBM Scalable POWER2 (SP2) parallel system installation at the Academic Computer Centre TASK in Gdansk and describes some technical problems concerning use of message-passing libraries (particularly the Message Passing Interface (MPI)) as well as communication subsystems available in IBM SP2 with the discussed software package.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1997, 1, 1; 109-126
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Extensive Statistical Mechanics - a Possible Basis for Modelling Processes in Computer Memory System
Autorzy:
Strzałka, D.
Powiązania:
https://bibliotekanauki.pl/articles/1538502.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.20.Ff
05.20.-y
05.90.+m
Opis:
Tsallis definition of non-extensive entropy introduced in 1988 has been considered to obtain new possibilities to construct generalized thermodynamical basis for statistical physics expanding classical Boltzmann-Gibbs thermodynamics for nonequilibrium states. During the last two decades this q-generalized theory has been successfully applied to considerable number of physically interesting complex phenomena. In the paper the possible thermodynamical basis of processes will be presented in nowadays computer systems in the case of memory behaviour.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 652-657
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multitask real-time architecture supporting predictable management and memory system
Zarządzanie oraz organizacja systemu pamięci wielozadaniowej przewidywalnej czasowo struktury czasu rzeczywistego
Autorzy:
Golly, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/152228.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
precision time model
pipeline interleave
system-level design
simulation and modeling
real-time electronic embedded systems
precyzyjne modele czasowe
przeplot wątków
projektowanie systemowe
symulacja i modelowanie
elektroniczne systemy wbudowane czasu rzeczywistego
Opis:
The paper presents an extension of interleave pipeline PRET architecture. The main emphasize is made on obtaining deterministic, time predicable data and a program memory system which cooperates with the pipeline processor. The idea is to pass control of all IO operations to a special unit called MACU (Memory Access Control Unit). Thread State Controller (TSC), Dynamic Interleave Controller (DIC) and MACU together with a pipeline processor are proposed, to deliver microarchitecture details, which deal with a number of hardware threads working in the system. The paper also discusses several arbitration policies in MACU and DIC. A few experiments are performed to show benefits of the proposed methodology.
Praca porusza tematykę przewidywalności czasowej systemów elektronicznych. Problem ten był obiektem badań różnych grup badaczy. Zdaniem autora największym osiągnięciem było przedstawienie architektury potokowej z przeplotem wątków sprzętowych. Główną cechą tego podejścia było usunięcie zjawiska hazardu danych i sterowania. Autor niniejszej pracy zwraca uwagę na kwestie wypracowania schematu zarządzania wielozadaniową architekturą przewidywalną czasowo oraz przewidywalnego czasowo systemu pamięci (pkt. nr 3). Pierwsza kwestia została rozwiązana dzięki zastosowaniu kontrolera kontekstu potoku (pkt. nr 4). Identyfikatory, pamięć stanów wątków (rys. 1), specjalne kolejki do przechowywania identyfikatorów (rys. nr 2) i danych (rys. nr 4) umożliwiły efektywne zarządzanie wątkami sprzętowymi. Zmiana kontekstu potoku (punkt nr 4., rys. 3 oraz 4) następuje, gdy wątek wykonuje rozkaz operacji z pamięcią (rys. nr 5). Dzięki temu podczas wykonywania operacji wejścia/wyjścia, inny wątek będzie mógł realizować swój program. Takie podejście pozwala na ukrycie detali związanych z dostępem do pamięci głównej (implementacja w module MACU) oraz zwiększenie wydajności systemu (pkt. nr 7.). Przedyskutowano także różne schematy arbitrażu przy wprowadzaniu wątków do potoku (algorytmy zaimplementowane w DIC) oraz dostępu do pamięci (algorytmy zaimplementowane w MACU) (pkt. nr 6). Wysunięte tezy potwierdzono wynikami eksperymentalnymi (pkt. nr 6).
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 6, 6; 346-349
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How the mind is ageing?
Autorzy:
Nosal, Czesław S.
Powiązania:
https://bibliotekanauki.pl/articles/704081.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cognitive aging
general intelligence
fluid and crystallized intelligence
memory system
working memory
associative memory
scaffolding theory
Opis:
The process of cognitive aging in global sense can be characterised by changes of the fluid and crystallised intelligence. In the context of this explanation the basic question is which cognitive functions and regulatory mechanisms play the basic role of the determinants for cognitive aging. Probable, mechanism of associative memory play a central role in top-down direction of cognitive processing. This type of memory connect the resources/networks of long term memory with the current processing in working memory. Another set of mechanisms concerns with bottom-up direction based on procedural memory, which is fundamental for the functioning of the mind as whole (Tulving theory,1985). Unfortunately, our knowledge about associative memory and its relations to working and procedural memory is incomplete and unclear. The importance of associative memory are partly, empirically supported by classic research on decreasing the cognitive components of intelligence aging, since the fluid and crystallized intelligence where discovered (Horn, Cattell, 1967). Changes of the mind functioning and its cognitive growth/aging can be characterised as a complex chain from primary, biologically determined mind, through Piagetian and Vygotsky’s type of mind to relatively balanced mind.
Źródło:
Nauka; 2019, 2
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relaxation Times in Magnetic Nanoparticles System and Memory Effects
Autorzy:
Osaci, M.
Abrudean, C.
Berdie, A.
Powiązania:
https://bibliotekanauki.pl/articles/1814024.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Lh
75.50.Tt
78.20.Bh
Opis:
Some memory effects in nanoparticle systems, similar to those seen in spin glass systems, may have important device applications, by tuning the interaction and the particle size. Recently, this subject provoked a special interest in nano-sciences. In this work we present a study, by simulation of the mode in which the behavior of a magnetic nanoparticle system is influenced by the superposition of the dimensions' distribution, the effective anisotropy constants and the disposal of nanoparticles in the sample, if we take into account the dipolar magnetic interaction.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1203-1212
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of shape memory alloy in harvesto-absorber system
Autorzy:
Kęcik, K.
Powiązania:
https://bibliotekanauki.pl/articles/386907.pdf
Data publikacji:
2015
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pendulum
sma spring
energy harvester
vibration absorber
control
continuation method
stopy z pamięcią kształtu
teoria Ginzburga-Landaua
tłumik drgań
Opis:
This paper presents a conception of the harvester-absorber system consisting of two parts. The first is the pendulum attached to the main system (oscillator), which is suspended on the linear damper and the nonlinear spring made of shape memory alloy. The spring is modelled as a polynomial function based on Landau–Ginzburg theory of phase transitions (similar as ferroelectric and ferromagnets). The obtained results show, that SMA element can increase harvesting energy level, while the absorber effect can be impaired (but not loss). Additionally, introducing SMA element causes changes in dynamics, introduces a new unstable solutions and bifurcations. The analysis was done by classical integration and continuation solution methods.
Źródło:
Acta Mechanica et Automatica; 2015, 9, 3; 155-160
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Między upamiętnieniem a rewizjonizmem. O dwóch portretach Jana Rodowicza „Anody”
Biography Blurred by Reportage. On Two Portraits of Jan Rodowicz “Anoda”
Autorzy:
Żarnecka, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/2097261.pdf
Data publikacji:
2021-12-16
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
archive
anti-system memory community
commemorative biography
critical interpretative biography
transitional justice
Opis:
The aim of the article is to compare two ways of introducing the poetics of reportage in biographical writing, using the method of comparative biography, described by Richard Holmes. The author compares two biographies of Jan Rodowicz “Anoda” by Barbara Wachowicz and Piotr Lipiński in aspects like: the use of the poetics of reportage, the selection of archival materials and the approach to it. As a result, she describes two ways a poetics of reportage can be introduced in biographical writing. The first one is described using the example of the book by Barbara Wachowicz, in which a portrait of a national hero is being constructed with archival materials provided by his own family and statements made by the members of the anti- system memory community, that were responsible for keeping the memory of the Warsaw Uprising and the post-war lives of its participants undisturbed by the state’s propaganda. The second one is represented in a book by Piotr Lipiński that uses the biography of “Anoda” to deal with the problem of transitional justice as an unfulfilled dream of Polish society. From this comparison a conclusion can be drawn that there are many ways that biographers can introduce the poetics of reportage in their writing, depending on their aims and the role they want to play in their books.
Źródło:
Zagadnienia Rodzajów Literackich; 2021, 64, 2; 99-111
0084-4446
Pojawia się w:
Zagadnienia Rodzajów Literackich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recurrent neural networks for dynamic reliability analysis
Autorzy:
Cadini, F.
Zio, E.
Pedroni, N.
Powiązania:
https://bibliotekanauki.pl/articles/2069583.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
dynamic reliability analysis
infinite impulse response
locally recurrent neural network
long-term non-linear dynamics
system state memory
simplified nuclear reactor
Opis:
A dynamic approach to the reliability analysis of realistic systems is likely to increase the computational burden, due to the need of integrating the dynamics with the system stochastic evolution. Hence, fast-running models of process evolution are sought. In this respect, empirical modelling is becoming a popular approach to system dynamics simulation since it allows identifying the underlying dynamic model by fitting system operational data through a procedure often referred to as ‘learning’. In this paper, a Locally Recurrent Neural Network (LRNN) trained according to a Recursive Back-Propagation (RBP) algorithm is investigated as an efficient tool for fast dynamic simulation. An application is performed with respect to the simulation of the non-linear dynamics of a nuclear reactor, as described by a simplified model of literature.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 45--53
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a nonlinear and chaotic non-ideal vibrating system with shape memory alloy (SMA)
O nieliniowym, chaotycznym i nieidealnym układzie drgającym z elementami wykazującymi efekt pamięci kształtu
Autorzy:
Piccirillo, V.
Balthazar, J. M.
Pontes, B. R. Jr.
Felix, J. L. P.
Powiązania:
https://bibliotekanauki.pl/articles/280905.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
pamięć kształtu
chaos
efekt Sommerfelda
shape memory
nonlinear dynamics
Sommerfeld effect
Opis:
In this paper, we present nonlinear dynamic behaviour of a system which consists of a mass connected to a rigid support by a shape memory alloy (SMA) element and a damper. In order to disturb the system, a DC motor with limited power supply is connected to the mass, causing an interaction between the vibrating structure and the energy source. The SMA element is characterised using a one-dimensional phenomenological constitutive model, based on the classical Devonshire theory. We analyse the non-ideal system in form of two coupled nonlinear differential equations. Some interesting nonlinear phenomena as the Sommerfeld effect and nonlinear resonance including periodic, chaotic and hyperchaotic regime are presented.
W pracy przedstawiono opis dynamiki nieliniowego układu złożonego z masy połączonej ze sztywnym podłożem za pośrednictwem elementu z pamięcią kształtu i tłu- mikiem. W celu realizacji wymuszenia w układzie zastosowano silnik prądu stałego z ograniczonym poborem mocy, który pobudza do ruchu masę, tworząc w ten sposób sprzężenie mechaniczne pomiędzy układem drgającym a źródłem energii. Element z pamięcią kształtu opisano za pomocą jednowymiarowego modelu fenomenologicznego opartego na teorii Devenshire’a. Przeanalizowano rozważany nieidealny układ opisany dwoma sprzężonymi nieliniowymi równaniami ruchu. Zaobserwowano i opisano interesujące zjawiska nieliniowe w postaci efektu Sommerfelda i nieliniowego rezonansu w zakresie drgań okresowych, chaotycznych i hiperchaotycznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2008, 46, 3; 597-620
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-range dependencies in reading memory pages in the man-computer system interaction
Autorzy:
Dymora, P.
Mazurek, M.
Nieroda, S.
Powiązania:
https://bibliotekanauki.pl/articles/106260.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
long-range dependencies
computer system
memory
Hurst parameter
operating system
Opis:
This paper shows that the organization of computer system memory as a hierarchical structure can lead to the existence of long-memory effect during the man-computer interaction. As a point of reference, the rate at which the operating system resolves data from hard drive caused by the hardware page faults in the virtual memory mechanism can be given. The existence of such a phenomenon can be considered in terms of statistical mechanics and Hurst parameter.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2012, 12, 2; 49-58
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single–server queueing system with limited queue, random volume customers and unlimited sectorized memory buffer
Autorzy:
Ziółkowski, Marcin
Tikhonenko, Oleg
Powiązania:
https://bibliotekanauki.pl/articles/2173725.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-server queueing system
queueing systems with random volume customers
sectorized memory buffer
total volume vector
Laplace-Stieltjes transform
system kolejkowy z jednym serwerem
system kolejkowy z losowymi klientami
bufor pamięci sektorowany
wektor objętości całkowity
transformata Laplace'a-Stieltjesa
Opis:
In the present paper, we analyze the model of a single–server queueing system with limited number of waiting positions, random volume customers and unlimited sectorized memory buffer. In such a system, the arriving customer is additionally characterized by a non– negative random volume vector whose indications usually represent the portions of unchanged information of a different type that are located in sectors of unlimited memory space dedicated for them during customer presence in the system. When the server ends the service of a customer, information immediately leaves the buffer, releasing resources of the proper sectors. We assume that in the investigated model, the service time of a customer is dependent on his volume vector characteristics. For such defined model, we obtain a general formula for steady–state joint distribution function of the total volume vector in terms of Laplace-Stieltjes transforms. We also present practical results for some special cases of the model together with formulae for steady–state initial moments of the analyzed random vector, in cases where the memory buffer is composed of at most two sectors. Some numerical computations illustrating obtained theoretical results are attached as well.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143647
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Queueing systems with random volume customers and a sectorized unlimited memory buffer
Autorzy:
Tikhonenko, Oleg
Ziółkowski, Marcin
Kempa, Wojciech M.
Powiązania:
https://bibliotekanauki.pl/articles/2055163.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
queueing system
random volume customers
sectorized memory buffer
total volume vector
Laplace transform
Laplace–Stieltjes transform
multivariate L’Hospital rule
system kolejkowania
wektor objętości
transformata Laplace'a
transformata Laplace'a-Stieltjesa
Opis:
In the present paper, we concentrate on basic concepts connected with the theory of queueing systems with random volume customers and a sectorized unlimited memory buffer. In such systems, the arriving customers are additionally characterized by a non-negative random volume vector. The vector’s indications can be understood as the sizes of portions of information of a different type that are located in the sectors of memory space of the system during customers’ sojourn in it. This information does not change while a customer is present in the system. After service termination, information immediately leaves the buffer, releasing its resources. In analyzed models, the service time of a customer is assumed to be dependent on his volume vector characteristics, which has influence on the total volume vector distribution. We investigate three types of such queueing systems: the Erlang queueing system, the single-server queueing system with unlimited queue and the egalitarian processor sharing system. For these models, we obtain a joint distribution function of the total volume vector in terms of Laplace (or Laplace-Stieltjes) transforms and formulae for steady-state initial mixed moments of the analyzed random vector, in the case when the memory buffer is composed of two sectors. We also calculate these characteristics for some practical case in which the service time of a customer is proportional to the customer’s length (understood as the sum of the volume vector’s indications). Moreover, we present some numerical computations illustrating theoretical results.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2021, 31, 3; 471--486
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-server queueing system with external and internal customers
Autorzy:
Tikhonenko, O.
Ziółkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/199838.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-server queueing system with non-homogeneous customers
random volume customers
loss probability
total volume distribution
Laplace transform
Laplace-Stieltjes transform
RAM memory space
prawdopodobieństwo straty
transformacja Laplace'a
transformata Laplace'a-Stieltjesa
pamięć RAM
Opis:
In the paper, we investigate a single-server queueing system with unlimited memory space and non-homogeneous customers (calls) of the two following types: 1) external customers that are served by the system under consideration, 2) internal customers that arrive and interrupt the service process only when an external customer is being served. The external customers appear according to a stationary Poisson process. Customers of each of the above-mentioned types are characterized by some random volume. The customer service time depends arbitrarily on its volume. Two schemes of customer service organization are analyzed. The non-stationary and stationary distributions of the total volume of customers present in the system are determined in terms of Laplace and Laplace-Stieltjes transforms. The stationary first and second moments of total customers volume are also calculated. The obtained results are used to approximate loss characteristics in analogous systems with limited buffer space. Numerical examples illustrating theoretical results are attached as well.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 539-551
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some preliminary results of memory cache analysis with the use of non-extensive
Autorzy:
Strzałka, D.
Powiązania:
https://bibliotekanauki.pl/articles/106168.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
complex systems
cache memory
system counters
sallis entropy
Opis:
The problem of modeling different parts of computer systems requires accurate statistical tools. Cache memory systems is an inherent part of nowadays computer systems, where the memory hierarchical structure plays a key point role in behavior and performance of the whole system. In the case of Windows operating systems, cache memory is a place in memory subsystem where the I/O system puts recently used data from disk. In paper some preliminary results about statistical behavior of one selected system counter behavior are presented. Obtained results shown that the real phenomena, which have appeared during human-computer interaction, can be expressed in terms of non-extensive statistics that is related to Tsallis proposal of new entropy definition.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2016, 16, 2; 43-47
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear q-Difference Fractional-Order Control Systems with Finite Memory
Autorzy:
Mozyrska, D.
Pawłuszewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/387319.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
obserwowalność
możliwość kontroli
pamięć
układ sterowania
memory
control system
observability
controllability
Opis:
The formula for the solution to linear q-difference fractional-order control systems with finite memory is derived. New definitions of observability and controllability are proposed by using the concept of extended initial conditions. The rank condition for observability is established and the control law is stated.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 2; 69-73
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł

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