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Wyświetlanie 1-15 z 34
Tytuł:
Scheduling arbitrary number of malleable tasks on multiprocessor systems
Autorzy:
Barketau, M. S.
Kovalyov, M. Y.
Węglarz, J.
Machowiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/202097.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-processor scheduling
malleable tasks
makespan
Opis:
The problem of scheduling n tasks in a multiprocessor system with m processors to minimize the makespan is studied. Tasks are malleable, which means that a task can be executed by several processors at a time, its processing speed depends on the number of allocated processors, and a set of processors allocated to the same task can change over time. The processing speed of a task is a strictly increasing function of the number of processors allocated to this task. The earlier studies considered the case n ≤ m. This paper presents results for arbitrary n and m including characterizations of a feasible domain and an optimal solution, polynomial time algorithms for strictly increasing convex and concave processing speed functions, and a combinatorial exponential algorithm for arbitrary strictly increasing functions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 255-261
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of the microstructure and properties in the length scales varying from nano- to macroscopic
Autorzy:
Kurzydłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/199877.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi length scale modelling
grain boundaries
nanomaterials
Opis:
The aim of this paper is to show the recent progress in multi length scale modelling of the engineering materials. This progress is demonstrated using a series of examples addressing, in particular, the role of effect of the grain boundaries in shaping properties of nano-polycrystalline metals.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 217-226
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simplified control strategy for single-phase UPS inverters
Autorzy:
Monfared, M.
Powiązania:
https://bibliotekanauki.pl/articles/201075.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-phase UPS
multi-loop feedback
feedforward
Opis:
Though there are many strategies to control single-phase uninterruptible power supply (UPS) inverters, they suffer from some drawbacks, the main being complexity. This paper proposes a simple dual-loop controller for the single-phase UPS inverter with the LC filter. The suggested control scheme uses the capacitor current as the feedback signal in the inner current loop. No fictitious phase generation or reference frame transformations are required, and simple proportional gains are employed as both voltage and current regulators. A feedforward of the derivative of the output voltage is also proposed, which significantly improves the performance of the closed loop control system. Then, based on the model of the inverter with the proposed control strategy, a simple and systematic design procedure is presented. Finally, the theoretical achievements are supported by extensive simulations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 367-373
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal selection of inner-branches parameters of matching circuits under the minimum branch-current RMS values and zero active-power conditions
Autorzy:
Jaraczewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/201906.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-terminal-network compensators
optimization
nonlinear load
Opis:
The article is a continuation of a study on the synthesis of matching multi-terminal networks, also known as compensators. The reactive four-terminal-network compensators for linear loads were introduced in previous publications, but it appeared they operate effectively with nonlinear loads too. The methods to create a compensator for a mono-harmonic source, which allows complete independence of the input from output waveforms, ensuring optimal operating conditions for the source, are presented herein. The work for the first time presents the optimal four-terminal-network compensator applied to a nonlinear load.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 777-783
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General specification of multi-robot control system structures
Autorzy:
Zieliński, C.
Winiarski, T.
Powiązania:
https://bibliotekanauki.pl/articles/199952.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
robot control systems
specification of controllers
multi-robot systems
Opis:
The paper deals with structuring robot control systems. The control system is decomposed into distinct agents. An agent, in general, is responsible for control of its effector, perception of the environment for the purpose of its effector control, and inter-agent communication. The behaviour of the agent is governed by its set of transition functions. The control system consists of two tiers – the upper tier is defined by the flow of information between the agents and the lower tier is defined by formal specification of each agent’s behaviour (influence on the environment, gathering sensor readings, production and consumption of the information for/from the other agents). The paper presents one of the examples of utilization of this approach. The example concerns the multi-robot drawing copying system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 15-28
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A robust 18-pulse diode rectifier with coupled reactors
Autorzy:
Mysiak, P.
Strzelecki, R.
Powiązania:
https://bibliotekanauki.pl/articles/200065.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
series active power filters
multi-pulse rectifiers
coupled reactors
power conditioning
Opis:
The article presents the principle of operation and selected results of simulation and laboratory tests of the 18-pulse rectifier system with coupled reactors and small series active power filter. The presented system makes it possible to reduce, especially in distribution supply networks, undesired higher current harmonics. The 18-pulse nature of operation of the rectifier is reached using a set of coupled three-phase network reactors (CDT and CTR). The simultaneous use of the coupled reactors and the small active power filter provides opportunities for reduction of the supply current distortion, especially in case of voltage harmonic distortion and voltage unbalance.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 541-550
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent multi-agent system for DC microgrid energy coordination control
Autorzy:
Qaderi-Baban, P.
Menhaj, M. B.
Dosaranian-Moghadam, M.
Fakharian, A.
Powiązania:
https://bibliotekanauki.pl/articles/200811.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-agent system
DC microgrid
energy management
coordinated control
voltage control
Opis:
In this paper, an energy coordination control method based on intelligent multi-agent systems (MAS) is proposed for energy management and voltage control of a DC microgrid. The structure of the DC microgrid is designed to realize the mathematical modeling of photovoltaic cells, fuel cells and batteries. A two-layer intelligent MAS is designed for energy coordination control: grid-connection and islanding of a DC microgrid is combined with energy management of PV cells, fuel cells, loads and batteries. In the hidden layer and the output layer of the pro-posed neural network there are 17 and 8 neurons, respectively, and the “logsig” activation function is used for the neurons in the network. Eight kinds of feature quantities and 13 different actions are taken as the input and output parameters of the neural network from the micro-source and the load, and the as the control center agent’s decision-makers. The feasibility of the proposed intelligent multi-agent energy coordination control strategy is verified by MATLAB/Simulink simulation, and three types of examples are analyzed after increasing the load. The simulation results show that the proposed scheme exhibits better performance than the traditional approaches.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 741-748
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-constrained topology optimization using constant criterion surface algorithm
Autorzy:
Mrzygłód, M.
Powiązania:
https://bibliotekanauki.pl/articles/201310.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-constrained topology optimization
stress and fatigue constraints
constant criterion surface algorithm
Opis:
This paper sets out to describe a multi-constrained approach to topology optimization of structures. In the optimization, a constant criterion surface algorithm and the multi-constraint procedure is used. The multi-constraint procedure consists of constraints normalization and equivalent design space assembling. The work is illustrated by an example of the L-shaped domain optimization with the horizontal line support and complex loads. The example takes into consideration stress, fatigue and compliance constraints. The separate and simultaneous application of constraints resulted in significant differences in structure topology layouts. The application of a fatigue constraint gave more conservative results when compared to static stress or compliance limitations. The multi-constrained approach allowed effectively lowering the mass of the structure while satisfying all constraints.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 229-236
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multipitch estimation using judge-based model
Autorzy:
Rychlicki-Kicior, K.
Stasiak, B.
Powiązania:
https://bibliotekanauki.pl/articles/200087.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MIR
fundamental frequency estimation
multi F0
multipitch
polyphony
częstotliwość
oszacowanie częstotliwości
polifony
Opis:
Multipitch estimation, also known as multiple fundamental frequency (F0) estimation, is an important part of the Music Information Retrieval (MIR) field. Although there have been many different approaches proposed, none of them has ever exceeded the abilities of a trained musician. In this work, an iterative cancellation method is analysed, being applied to three different sound representations - salience spectrum obtained using Constant-Q Transform, cepstrum and enhanced autocorrelation result. Real-life recordings of different musical instruments are used as a database and the parameters of the solution are optimized using a simple yet effective metaheuristic approach - the Luus-Jaakola algorithm. The presented approach results in 85% efficiency on the test database.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 751-757
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-loop control system design
Autorzy:
Alekseev, A.
Zamyatin, S.
Rudnicki, V.
Powiązania:
https://bibliotekanauki.pl/articles/201635.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
control system
multi-loop system
plant identification
auto tuning controller
real interpolation method
Opis:
The approach based on a special case of the Laplace transform, which allows to design multi-loop system is considered. The tuning regulators program on the base of this approach is developed. The numerical example is shown.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 627-630
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A survey of requirements for COVID-19 mitigation strategies
Autorzy:
Jamroga, Wojciech
Mestel, David
Roenne, Peter B.
Ryan, Peter Y. A.
Skrobot, Marjan
Powiązania:
https://bibliotekanauki.pl/articles/2086859.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
COVID-19
mitigation strategies
specification
multi-agent logic
strategia łagodzenia
specyfikacja
logika wieloagentowa
Opis:
The COVID-19 pandemic has influenced virtually all aspects of our lives. Across the world, countries have applied various mitigation strategies, based on social, political, and technological instruments. We postulate that multi-agent systems can provide a common platform to study (and balance) their essential properties. We also show how to obtain a comprehensive list of the properties by “distilling” them from media snippets. Finally, we present a preliminary take on their formal specification, using ideas from multi-agent logics.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137724, 1--10
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic guarantee of success for multi-agent memetic systems
Autorzy:
Byrski, A.
Schaefer, R.
Smołka, M.
Cotta, C.
Powiązania:
https://bibliotekanauki.pl/articles/201942.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational multi-agent systems
asymptotic analysis
global optimization
parallel evolutionary algorithms
Markov chain modeling
Opis:
The paper introduces a stochastic model for a class of population-based global optimization meta-heuristics, that generalizes existing models in the following ways. First of all, an individual becomes an active software agent characterized by the constant genotype and the meme that may change during the optimization process. Second, the model embraces the asynchronous processing of agent’s actions. Third, we consider a vast variety of possible actions that include the conventional mixing operations (e.g. mutation, cloning, crossover) as well as migrations among demes and local optimization methods. Despite the fact that the model fits many popular algorithms and strategies (e.g. genetic algorithms with tournament selection) it is mainly devoted to study memetic algorithms. The model is composed of two parts: EMAS architecture (data structures and management strategies) allowing to define the space of states and the framework for stochastic agent actions and the stationary Markov chain described in terms of this architecture. The probability transition function has been obtained and the Markov kernels for sample actions have been computed. The obtained theoretical results are helpful for studying metaheuristics conforming to the EMAS architecture. The designed synchronization allows the safe, coarse-grained parallel implementation and its effective, sub-optimal scheduling in a distributed computer environment. The proved strong ergodicity of the finite state Markov chain results in the asymptotic stochastic guarantee of success, which in turn imposes the liveness of a studied metaheuristic. The Markov chain delivers the sampling measure at an arbitrary step of computations, which allows further asymptotic studies, e.g. on various kinds of the stochastic convergence.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 257-278
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of hydro-thermo-chemo-mechanical phenomena in building materials
Autorzy:
Gawin, D.
Koniorczyk, M.
Pesavento, F.
Powiązania:
https://bibliotekanauki.pl/articles/202013.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
building materials
chemical degradation
hydro-thermal processes
mechanics of multi-phase porous media
numerical solution
Opis:
IssueJournal/Yearbook Volume Issue Page Issues Volume 61 (2013) Issue 1 (Mar 2013) , pp. 5-286 Volume 60 (2012) Issue 4 (Dec 2012) , pp. 673-859 Issue 3 (Sep 2012) , pp. 371-667 Issue 2 (Jun 2012) , pp. 185-368 Issue 1 (Mar 2012) , pp. 3-178 Volume 59 (2011) Issue 4 (Dec 2011) , pp. 371-579 Issue 3 (Sep 2011) , pp. 247-366 Issue 2 (Jun 2011) , pp. 125-243 Issue 1 (Mar 2011) , pp. 3-115 Volume 58 (2010) Issue 4 (Dec 2010) , pp. 463-716 Issue 3 (Sep 2010) , pp. 347-458 Issue 2 (Jun 2010) , pp. 217-342 Issue 1 (Mar 2010) , pp. 3-207 Volume 57 (2009) Issue 4 (Dec 2009) , pp. 297-398 Issue 3 (Sep 2009) , pp. 195-292 Issue 2 (Jun 2009) , pp. 123-188 Issue 1 (Mar 2009) , pp. 3-116 Most Downloaded Articles Joint reactions in rigid or flexible body mechanisms with redundant constraints by Wojtyra, M. and Frączek, J. Modified current differencing transconductance amplifier – new versatile active element by Malcher, A. Particle swarm optimization of artificial-neural-network-based on-line trained speed controller for battery electric vehicle by Ufnalski, B. and Grzesiak , L.M. Laser modification of the materials surface layer – a review paper by Kusinski, J./ Kac, S./ Kopia, A./ Radziszewska, A./ Rozmus-Górnikowska, M./ Major, B./ Major, L./ Marczak, J. and Lisiecki, A. Gas sensors based on nanostructures of semiconductors ZnO and TiO2 by Pustelny, T./ Procek, M./ Maciak, E./ Stolarczyk, A./ Drewniak, S./ Urbańczyk, M./ Setkiewicz, M./ Gut, K. and Opilski, Z. View Top 20 Most Downloaded Articles Previous Article Next Article Go to table of contents Download full text pdf (PDF, 1 MB) Modelling of hydro-thermo-chemo-mechanical phenomena in building materials D. Gawin1 / M. Koniorczyk1 / F. Pesavento2 1Department of Building Physics and Building Materials, Lodz University of Technology, 6 Politechniki Ave., 90-924 Lodz, Poland 2Department of Civil, Architectural and Environmental Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy Citation Information: Bulletin of the Polish Academy of Sciences: Technical Sciences. Volume 61, Issue 1, Pages 51–63, ISSN (Print) 0239-7528, DOI: 10.2478/bpasts-2013-0004, May 2013 Publication History: Published Online: 2013-05-01 Abstract A general approach to modelling chemical degradation processes in building materials, due to combined action of variable hydrothermal, chemical and mechanical loads, is presented. Mechanics of multiphase porous media and damage mechanics are applied for this purpose, and kinetics of degradation processes is described with evolution equations based on thermodynamics of chemical reactions. The mass-, energy - and momentum balances, as well as the evolution equations, constitutive and physical relations are briefly summarized. Then, the model governing equations are numerically solved with the finite element method. Three examples of the model application for analyzing degradation processes of building materials are presented and discussed. The first one deals with capillary suction of the salt solution by two different building materials, the second one with the salt crystallization during drying of a brick wall, and the third one concerns calcium leaching from a concrete wall due to the chemical attack of pure water under pressure gradient at two different temperatures.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 51-63
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MFFNet: A multi-frequency feature extraction and fusion network for visual processing
Autorzy:
Deng, Jinsheng
Zhang, Zhichao
Yin, Xiaoqing
Powiązania:
https://bibliotekanauki.pl/articles/2173678.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deblurring
multi-feature fusion
deep learning
attention mechanism
rozmywanie
fuzja wielu funkcji
głęboka nauka
mechanizm uwagi
Opis:
Convolutional neural networks have achieved tremendous success in the areas of image processing and computer vision. However, they experience problems with low-frequency information such as semantic and category content and background color, and high-frequency information such as edge and structure. We propose an efficient and accurate deep learning framework called the multi-frequency feature extraction and fusion network (MFFNet) to perform image processing tasks such as deblurring. MFFNet is aided by edge and attention modules to restore high-frequency information and overcomes the multiscale parameter problem and the low-efficiency issue of recurrent architectures. It handles information from multiple paths and extracts features such as edges, colors, positions, and differences. Then, edge detectors and attention modules are aggregated into units to refine and learn knowledge, and efficient multi-learning features are fused into a final perception result. Experimental results indicate that the proposed framework achieves state-of-the-art deblurring performance on benchmark datasets.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e140466
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated analytical-field design method of multi-disc magnetorheological clutches for automotive applications
Autorzy:
Kluszczyński, Krzysztof
Pilch, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/2086881.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromechanical convertor
drive system component
electromagnetic calculations
MR fluids
magnetorheological fluids
MR multi-disc clutch
multi-disc magnetorheological clutch
clutch design
analytical field
design
przetwornik elektromechaniczny
element układu napędowego
obliczenia elektromagnetyczne
płyny MR
płyny magnetoreologiczne
wielotarczowe sprzęło magnetoreologiczne
sprzęgło wielotarczowe
projektowanie
Opis:
This study proposes a new integrated analytical-field design method for multi-disc magnetorheological (MR) clutches. This method includes two stages, an analytical stage (composed of 36 algebraic formulas) and a field stage based on the finite element method (FEM). The design procedure is presented systematically, step-by-step, and the results of the consecutive steps of the design calculations are depicted graphically against the background of the entire considered clutch. The essential advantage of the integrated method with this two-stage structure is the relatively high accuracy of the first analytical stage of the design procedure and the rapid convergence of the second field stage employing the FEM. The essence of the new method is the introduction of a yoke factor ky (the concept of which is based on the theory of induction machines) that determines the ratio of magnetomotive force required to magnetise the entire magnetic circuit of the clutch to the magnetomotive force required to magnetise the movement region. The final value, the yoke factor ky is determined using loop calculations. The simplicity of the developed design method predisposes its use in optimisation calculations. The proposed method can also be adapted to other MR devices analysed in shear mode.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139392, 1--15
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 34

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