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Tytuł:
A new fuzzy Lyapunov approach to non-quadratic stabilization of Takagi-Sugeno fuzzy models
Autorzy:
Abdelmalek, I.
Goléa, N.
Hadjili, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/911242.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
liniowe nierówności macierzowe
stabilizacja
funkcja Lapunowa
model Takagi-Sugeno
system rozmyty
T-S fuzzy systems
non-quadratic stability conditions
linear matrix inequalities
parallel distributed compensation
stabilization
Opis:
In this paper, new non-quadratic stability conditions are derived based on the parallel distributed compensation scheme to stabilize Takagi-Sugeno (T-S) fuzzy systems. We use a non-quadratic Lyapunov function as a fuzzy mixture of multiple quadratic Lyapunov functions. The quadratic Lyapunov functions share the same membership functions with the T-S fuzzy model. The stability conditions we propose are less conservative and stabilize also fuzzy systems which do not admit a quadratic stabilization. The proposed approach is based on two assumptions. The first one relates to a proportional relation between multiple Lyapunov functions and the second one considers an upper bound to the time derivative of the premise membership functions. To illustrate the advantages of our proposal, four examples are given.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 1; 39-51
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the efficiency of a parallel program for construction of the shortest covering of a Boolean matrix
Autorzy:
Adamus, A.
Novikov, S.
Powiązania:
https://bibliotekanauki.pl/articles/93008.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Boolean matrix
shortest covering
parallel program
cluster
Opis:
The paper presents results of investigations of the efficiency of a parallel program for the solution of the NP-complete problem of constructing of the shortest covering of a Boolean matrix. It was explored dependencies of the time of constructing of the shortest covering from the number processing processors of a cluster and from the dimension of a Boolean matrix.
Źródło:
Studia Informatica : systems and information technology; 2010, 1-2(14); 67-76
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Unrelated Parallel Machines Scheduling Problem with Machine and Job Dependent Setup Times, Availability Constraints, Time Windows and Maintenance Times
Autorzy:
Agárdi, Anita
Nehéz, Károly
Powiązania:
https://bibliotekanauki.pl/articles/2023961.pdf
Data publikacji:
2021-09
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
production scheduling
parallel machine
setup time
time windows
genetic algorithm
Opis:
Unrelated Parallel Machines Scheduling Problem (U-PMSP) is a category of discrete optimization problems in which various manufacturing jobs are assigned to identical parallel machines at particular times. In this paper, a specific production scheduling task the U-PMSP with Machine and Job Dependent Setup Times, Availability Constraint, Time Windows and Maintenance Times is introduced. Machines with different capacity limits and maintenance times are available to perform the tasks. After that our problem, the U-PMSP with Machine and Job Dependent Setup Times, Availability Constraints, Time Windows and Maintenance Times is detailed. After that, the applied optimization algorithm and their operators are introduced. The proposed algorithm is the genetic algorithm (GA), and proposed operators are the order crossover, partially matched crossover, cycle crossover and the 2-opt as a mutation operator. Then we prove the efficiency of our algorithm with test results. We also prove the efficiency of the algorithm on our own data set and benchmark data set. The authors conclude that this GA is effective for solving high complexity parallel machine problems.
Źródło:
Management and Production Engineering Review; 2021, 13, 3; 15-24
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advances in parallel heterogeneous genetic algorithms for continuous optimization
Autorzy:
Alba, E.
Luna, F.
Nebro, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/907622.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
algorytm genetyczny
optymalizacja ciągła
konwergencja przedwczesna
parallel genetic algorithms
continuous optimization
premature convergence
heterogeneity
Opis:
In this paper we address an extension of a very efficient genetic algorithm (GA) known as Hy3, a physical parallelization of the gradual distributed real-coded GA (GD-RCGA). This search model relies on a set of eight subpopulations residing in a cube topology having two faces for promoting exploration and exploitation. The resulting technique has been shown to yield very accurate results in continuous optimization by using crossover operators tuned to explore and exploit the solutions inside each subpopulation. We introduce here a further extension of Hy3, called Hy4, that uses 16 islands arranged in a hypercube of four dimensions. Thus, two new faces with different exploration/exploitation search capabilities are added to the search performed by Hy3. We analyze the importance of running a synchronous versus an asynchronous version of the models considered. The results indicate that the proposed Hy4 model overcomes the Hy3 performance because of its improved balance between exploration and exploitation that enhances the search. Finally, we also show that the async Hy4 model scales better than the sync one.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 3; 317-333
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel approach for big data classification based on hybrid parallel dimensionality reduction using spark cluster
Autorzy:
Ali, Ahmed Hussein
Abdullah, Mahmood Zaki
Powiązania:
https://bibliotekanauki.pl/articles/305766.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
big data
dimensionality reduction
parallel processing
Spark
PCA
LDA
Opis:
The big data concept has elicited studies on how to accurately and efficiently extract valuable information from such huge dataset. The major problem during big data mining is data dimensionality due to a large number of dimensions in such datasets. This major consequence of high data dimensionality is that it affects the accuracy of machine learning (ML) classifiers; it also results in time wastage due to the presence of several redundant features in the dataset. This problem can be possibly solved using a fast feature reduction method. Hence, this study presents a fast HP-PL which is a new hybrid parallel feature reduction framework that utilizes spark to facilitate feature reduction on shared/distributed-memory clusters. The evaluation of the proposed HP-PL on KDD99 dataset showed the algorithm to be significantly faster than the conventional feature reduction techniques. The proposed technique required >1 minute to select 4 dataset features from over 79 features and 3,000,000 samples on a 3-node cluster (total of 21 cores). For the comparative algorithm, more than 2 hours was required to achieve the same feat. In the proposed system, Hadoop’s distributed file system (HDFS) was used to achieve distributed storage while Apache Spark was used as the computing engine. The model development was based on a parallel model with full consideration of the high performance and throughput of distributed computing. Conclusively, the proposed HP-PL method can achieve good accuracy with less memory and time compared to the conventional methods of feature reduction. This tool can be publicly accessed at https://github.com/ahmed/Fast-HP-PL.
Źródło:
Computer Science; 2019, 20 (4); 411-429
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallelizing user-defined functions in the ETL workflow using orchestration style sheets
Autorzy:
Ali, Syed Muhammad Fawad
Mey, Johannes
Thiele, Maik
Powiązania:
https://bibliotekanauki.pl/articles/331096.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ETL workflow
parallel ETL operator
parallel algorithmic skeleton
user defined function
workflow ETL
równoległy szkielet algorytmiczny
funkcja zdefiniowana przez użytkownika
Opis:
Today’s ETL tools provide capabilities to develop custom code as user-defined functions (UDFs) to extend the expressiveness of the standard ETL operators. However, while this allows us to easily add new functionalities, it also comes with the risk that the custom code is not intended to be optimized, e.g., by parallelism, and for this reason, it performs poorly for data-intensive ETL workflows. In this paper we present a novel framework, which allows the ETL developer to choose a design pattern in order to write parallelizable code and generates a configuration for the UDFs to be executed in a distributed environment. This enables ETL developers with minimum expertise in distributed and parallel computing to develop UDFs without taking care of parallelization configurations and complexities. We perform experiments on large-scale datasets based on TPC-DS and BigBench. The results show that our approach significantly reduces the effort of ETL developers and at the same time generates efficient parallel configurations to support complex and data-intensive ETL tasks.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 1; 69-79
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative stability analysis of D23N mutated Aβ
Autorzy:
Alred, E. J.
Scheele, E. G.
Berhanu, W. M.
Hansmann, U. H. E.
Powiązania:
https://bibliotekanauki.pl/articles/1935815.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska
Tematy:
Aβ
structural polymorphism
molecular dynamics
parallel and anti-parallel β sheets
Iowa mutant
Opis:
Amyloid β (Aβ) is the subject of numerous studies due to its link to the devastating Alzheimer’s disease and it exists in a parallel structure in fibril aggregate. The Iowa mutant (D 23 N) Aβ posses a unique antiparallel fibril aggregate structure and can also form parallel structure. This structural difference, coupled with the fact that occurrence of the Iowa mutant is correlated with early onset Alzheimer’s, suggests to use these peptides as candidates for computational studies of the structural determinants of the toxicity of Alzheimer’s disease. In order to compare the two observed Aβ structural motifs, we designed a computational study to probe the factors that affect the stability of parallel and antiparallel aggregates. Since the structural changes may occur on a timescale beyond that sampled in traditional molecular dynamics (MD), we employed a techniques of scaling the mass to reduce the solution ’s viscosity and compared the results to regular molecular dynamics. The knowledge gained from this study could provide insight into the mechanism of selection for antiparallel and parallel two fold structures.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 4; 365--371
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work safety interventions and threat complexity - a formative investigation into why farmers do not act safely
Autorzy:
Alwall Svennefelt, C.E.
Hunter, E.
Palsdottir, A.M.
Powiązania:
https://bibliotekanauki.pl/articles/2083063.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
agriculture
extended parallel processing model
fear appeals
occupational injuries
formative research
Safe Farmers
Common Sense
Opis:
Introduction. Fear appeals are a common tactic used in work safety interventions to motivate farmers to adopt safer behaviours. They begin by introducing a threat, followed by information on how to remove the threat. However, fear appeals tend to be ineffective when developed without a firm grasp of the cognitive processes underlying behavioural change. Although previous research on farm safety interventions have investigated fear appeals, they have focused on very narrow threats and behaviours, such as tractor or cow safety, while others have studied the threats but not the cognitive processing. Consequently, not enough is known about the range of threats that evoke fear, how farmers behave when under threat, or their general cognitive beliefs regarding self-efficacy, response cost and response efficacy. In In this study, 23 Swedish Farmers were interviewed and participated in a work safety intervention to identify the range of threats farmers perceive, and actions taken to remove those threats. Materials and method. The extended parallel processing model was used to gain insights into how farmers cognitively processed threats and their subsequent behaviour. Interestingly, it was found that farmers were more fearful of work safety threats related to family members and employees—yet the actions they took to reduce threats were mostly personal in nature. To help explain this finding, a typology of threat complexity was developed by the authors. Results. It was found that simple, common, and direct threats to safety tended to lead to adaptive, threat-reducing behaviours, whereas complex, general, or indirect threats promoted more maladaptive behaviours that reduced fear, but not the threats.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 280-289
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solution of viscous flow in a rectangular region by using the hybrid finite volume scheme
Autorzy:
Ambethkar, Vusala
Basumatary, Lakshmi Rani
Powiązania:
https://bibliotekanauki.pl/articles/122951.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
components of velocity
pressure
moving parallel walls
rectangular region
hybrid finite volume scheme
lepki przepływ
liczba Reynoldsa
przepływ laminarny
ciśnienie
Opis:
In the present work, a solution to the problem of viscous flow in a rectangular region with two moving parallel walls is obtained by using a hybrid finite volume scheme. The discretized governing equations are solved iteratively, and thereby the flow variables are computed numerically. The results for velocity and pressure in horizontal and vertical directions through the centre of a rectangular region are elucidated. The nature of velocity profiles and pressure for different Reynolds numbers in the horizontal and vertical directions through the geometric centre was analyzed with the help of pictorial representations. The present results are compared with the available benchmark results and we have found that they are not in disagreement.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 3; 17-30
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel solutions on model-based and model-free robotic-assisted ankle rehabilitation
Autorzy:
Arceo, Juan Carlos
Alvarez, Jorge
Armenta, Carlos
Lauber, Jimmy
Cremoux, Sylvian
Simoneau-Buessinger, Emilie
Bernal, Miguel
Powiązania:
https://bibliotekanauki.pl/articles/1409032.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active disturbance rejection
computed torque control
differential algebraic equations
parallel rehabilitation robot
real-time implementation
system identification
Opis:
In this report, ankle rehabilitation routines currently approved by physicians are implemented via novel control algorithms on a recently appeared robotic device known as the motoBOTTE. The physician specifications for gait cycles are translated into robotic trajectories whose tracking is performed twofold depending on the availability of a model: (1) if obtained via the Euler-Lagrange approach along with identification of unknown plant parameters, a new computed-torque control law is proposed; it takes into account the parallel-robot characteristics; (2) if not available, a variation of the active disturbance rejection control technique whose parameters need to be tuned, is employed. A detailed discussion on the advantages and disadvantages of the model-based and model-free results, from the continuous-time simulation to the discrete-time implementation, is included.
Źródło:
Archives of Control Sciences; 2021, 31, 1; 5-27
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonrandomized response model for complex survey designs
Autorzy:
Arnab, Raghunath
Shangodoyin, Dahud Kehinde
Arcos, Antonio
Powiązania:
https://bibliotekanauki.pl/articles/1359279.pdf
Data publikacji:
2019-04-25
Wydawca:
Główny Urząd Statystyczny
Tematy:
complex survey designs
parallel model
randomized response
probability proportional to size
varying probability sampling
Opis:
Warner’s randomized response (RR) model is used to collect sensitive information for a broad range of surveys, but it possesses several limitations such as lack of reproducibility, higher costs and it is not feasible for mail questionnaires. To overcome such difficulties, nonrandomized response (NRR) surveys have been proposed. The proposed NRR surveys are limited to simple random sampling with replacement (SRSWR) design. In this paper, NRR procedures are extended to complex survey designs in a unified setup, which is applicable to any sampling design and wider classes of estimators. Existing results for NRR can be derived from the proposed method as special cases.
Źródło:
Statistics in Transition new series; 2019, 20, 1; 67-86
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementacja kontrolera mikroprocesorowych układów transmisji równoległej w strukturach CPLD
Implementation of a hardware controller of microprocessor PPI devices in CPLD structures
Autorzy:
Arnold, K.
Michalak, S.
Powiązania:
https://bibliotekanauki.pl/articles/156511.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
systemy mikroprocesorowe
transmisja równoległa
układy CPLD
dekodowanie adresów
kontroler przerwań
microprocessor systems
parallel transmission
CPLD
address decoding
interrupt controller
Opis:
W pracy przedstawiono możliwości zwiększania liczby wejść i wyjść równoległych w systemach mikroprocesorowych z wykorzystaniem programowalnych układów peryferyjnych. Wskazano ograniczenia w zakresie rozszerzania portów równoległych i zaproponowano rozwiązanie problemu multi-liniowej komunikacji mikrokontrolerów z otoczeniem przez sterowanie zewnętrznych specjalizowanych układów peryferyjnych z poziomu kontrolera CPLD, odpowiedzialnego za dekodowanie adresów wejścia/wyjścia i przyjmowanie zgłoszeń przerwań.
In this paper the possibility of increasing parallel inputs and outputs in microprocessor systems with a programmable peripheral interface (PPI) is presented. The requirements and restrictions associated with expanding parallel ports for microprocessors with internal bus and microprocessors with external access memory are described. The basic system with a central processor unit and parallel transmission device(s) is described (Fig. 1) and parallel interface modes for 82C55A PPI are shown (Figs. 2, 3). An example of multi-channel communication between a microcontroller and external units, with hardware CPLD controller and PPI devices, is given. The controller is responsible for input/output address decoding and interrupts receiving (Fig. 4). The external address/interrupt controller minimizes the time required by the microcomputer for interruption of the current program, servicing of the peripheral units, and resumption of the interrupted program. The basic requirements for programmable devices working as controllers in input/output parallel integrated subsystems are shown. The controller was implemented in one of XC9500XL family devices (Tab. 1). For each device from this family the I/Os are fully 5V (CMOS, TTL) tolerant even though the core power supply is 3.3 volts. In mixed (5V/3.3V/2.5V) systems a controller can work with low power supply microprocessors (Fig. 5). Use of this one programmable device gives us a chance for creating a flexible controller (Fig. 6) which can work with different kinds of 8-bit central units.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 7, 7; 635-637
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the effectiveness of variation of physical variables on steady flow between parallel plates with heat transfer in a porous medium
O efektywności uzmienniania parametrów fizycznych stacjonarnego przepływu przez ośrodek porowaty z uwzględnieniem przesyłu ciepła pomiędzy równoległymi płytami
Autorzy:
Attia, H. A.
Abdeen, M, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/949360.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
variable properties
porous medium
heat transfer
parallel plates
steady state
Opis:
The effect of variation of physical variables on a steady flow through a porous medium with heat transfer between parallel plates is examined. The viscosity and the thermal conductivity are assumed to be temperature dependent. A constant pressure gradient is applied in the axial direction and the two plates are kept at two constant but different temperatures, while the viscous dissipation is considered in the energy equation. A numerical solution for the governing non-linear coupled equations of motion and the energy equation is determined. The effect of porosity of the medium, the variable viscosity, and the variable thermal conductivity on both the velocity and temperature distributions is reported.
W pracy zbadano wpływ zmiany parametrów fizycznych na ustalony przepływ przez porowaty ośrodek przy jednoczesnym przesyle ciepła pomiędzy równoległymi płytami ograniczającym obszar ośrodka. Założono, że lepkość i współczynnik przewodnictwa cieplnego są zależne od temperatury. Do utrzymania stacjonarnego przepływu wprowadzono stały gradient ciśnienia w kierunku osiowym, a dwie płyty utrzymano w stałych, lecz różniących się temperaturach. Efekt dyssypacji wiskotycznej uwzględniono w równaniu energii. Zaprezentowano numeryczne rozwiązanie nieliniowych, sprzężonych równań ruchu oraz równania energii. Omówiono wpływ porowatości ośrodka, zmiennej lepkości i współczynnika przewodnictwa cieplnego na rozkład prędkości i temperatury w obszarze przepływu.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 1; 53-61
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High voltage pulse generation using magnetic pulse compression
Autorzy:
Balcerak, M.
Hołub, M.
Pałka, R.
Powiązania:
https://bibliotekanauki.pl/articles/141756.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kicker power supply
power source for pulse corona discharge
magnetic pulse compression
parallel connection of IGBT and MOSFET transistors
Opis:
The paper presents an overview of a method of nanosecond-scale high voltage pulse generation using magnetic compression circuits. High voltage (up to 18 kV) short pulses (up to 1.4 μs) were used for Pulsed Corona Discharge generation. In addition, the control signal of parallel connection of IGBT and MOSFET power transistor influence on system losses is discussed. For a given system topology, an influence of core losses on overall pulse generator efficiency is analysed.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 463-472
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positioning accuracy analysis of the parallel mechanism near singular positions
Autorzy:
Bałchanowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/265691.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
clearances in the joint
parallel mechanism
singular positions
pojedyncze obiekty
mechanizmy równoległe
modelowanie numeryczne
Opis:
This paper presents a method of numerical modelling of parallel mechanisms with clearances in their kinematic pairs taken into account. The pairs with clearances are modelled as shape connections based on constraints in the form of contact interactions. Using the created models simulations were run to determine the positioning errors of the links in a parallel mechanism with three degrees of freedom (MR2120). In particular, the accuracy of positioning the links close to the mechanism singular configurations was studied.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 1; 5-18
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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