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Wyświetlanie 1-15 z 1202
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:
Multivariate and Geostatistical Analyses of Groundwater Quality for Acid Rock Drainage at Waste Rock and Tailings Storage Site
Autorzy:
Adadzi, Patrick
Allwright, Amy
Fourie, Francois
Powiązania:
https://bibliotekanauki.pl/articles/2202307.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
acid rock drainage
groundwater
correlation matrix
principal component analysis
geostatistical analysis
Opis:
A multi-disciplinary approach is indispensable for adequate acid rock drainage (ARD), mineral leaching impact, and groundwater management. Groundwater is a valuable resource, and it is critical to protect as well as mitigate the effects of pollution such as ARD in the mining environment. Mine waste storage facilities (waste rocks and tailings) are potential ARD sources capable of degrading groundwater reserves. This research investigated and reported the application of a case study of multivariate statistical and spatial variability of selected parameters associated with ARD in groundwater around WRD and TSF at mine sites. Water quality analysis data of seventy water samples from 10 boreholes located at the WRD and TSF mine were utilised in this study. The correlation matrix and principal components analysis was applied to the data set to determine the associated variability in groundwater in relation to ARD. Geostatistical analysis was used to produce contour maps to ARD principal components of the study site, using ordinary kriging of the best fit models. The application of multivariate statistical and geospatial analysis in groundwater quality assessment with coupled soil and groundwater modelling of flow and transport at waste rock dump and tailings storage sites provides an essential tool for exploratory data analysis, and spatial extent determination of the relationship between various data sets significant to acid rock drainage.
Źródło:
Journal of Ecological Engineering; 2022, 23, 12; 203--216
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matrix jako cykl intertekstualny
Autorzy:
Adam, Franke,
Powiązania:
https://bibliotekanauki.pl/articles/897427.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Men in Black
Science fiction
Matrix
Anonymous
Monomit
Gurdżijew
Gnostycyzm
Opis:
The text is an attempt to present lesser-known plot interpretations of the Matrix series (both film trilogy and anime Animatrix) movies. The author uses various research perspectives (religio-mystical, political and socio-economic ones) to present possible ways of interpretation of particular motifs and characters, referring among others to mystical beliefs, Gnostic ideas and the tradition of initiation novel, but also to contemporary popular culture regarding films and science fiction novels. The analysis contains as well socio-political issues touched upon in the movie; moreover on the example of Anonymous Group activities the author reveals the way Matrix series still influences contemporary culture.
Źródło:
Przegląd Humanistyczny; 2015, 59(3 (450)); 145-153
0033-2194
Pojawia się w:
Przegląd Humanistyczny
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:
Solution of the Stieltjes truncated matrix moment problem
Autorzy:
Adamyan, V.M.
Tkachenko, I.M.
Powiązania:
https://bibliotekanauki.pl/articles/255081.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Stieltjes power moments
canonical solutions
Nevanlinna's formula
matrix
Opis:
The truncated Stieltjes matrix moment problem consisting in the description of all matrix distributions sigma(t) on [0, infin) with given first 2n + 1 power moments (Cj)nj=0 is solved using known results on the corresponding Hamburger problem for which sigma(t) are defined on (-infin, infin). The criterion of solvability of the Stieltjes problem is given and all its solutions in the non-degenerate case are described by selection of the appropriate solutions among those of the Hamburger problem for the same set of moments. The results on extensions of non-negative operators are used and a purely algebraic algorithm for the solution of both Hamburger and Stieltjes problems is proposed.
Źródło:
Opuscula Mathematica; 2005, 25, 1; 5-24
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of stress and strain state of aluminum alloys during a hot extrusion and patterns of structure and feature formation
Autorzy:
Aghbalyan, Suren G.
Bagdasaryan, Vazgen
Vasilyan, Gayane A.
Wyczółkowski, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/36074875.pdf
Data publikacji:
2024
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
casting
aluminum alloy
hot extrusion
slip
stress
matrix
pressure
Opis:
This paper investigates the stress and strain state as well as formation processes of structure and features of aluminum alloys during the hot extrusion. It has been shown that during the hot extrusion the ring layers of an extruded element experience not only longitudinal and transverse deformations, but also a slip. The slip increases from inner layers to the surface layer. The tensile principal stresses and the sum of slip deformations also increase. It has been also demonstrated that at the exit of the pressing part the tensile principal stresses have different directions, forming an angle with extruder axis, which also increases towards the surface. In conclusion, it has been stated that the main radial and circumferential deformations act as restraining deformations.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2024, 33, 1; 3-16
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic extractive and generic document summarization based on NMF
Autorzy:
Aghdam, Mehdi Hosseinzadeh
Powiązania:
https://bibliotekanauki.pl/articles/2201319.pdf
Data publikacji:
2023
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
text summarization
latent topics
non-negative matrix factorization
updating rules
Opis:
Nowadays, textual information grows exponentially on the Internet. Text summarization (TS) plays a crucial role in the massive amount of textual content. Manual TS is time-consuming and impractical in some applications with a huge amount of textual information. Automatic text summarization (ATS) is an essential technology to overcome mentioned challenges. Non-negative matrix factorization (NMF) is a useful tool for extracting semantic contents from textual data. Existing NMF approaches only focus on how factorized matrices should be modeled, and neglect the relationships among sentences. These relationships provide better factorization for TS. This paper suggests a novel non-negative matrix factorization for text summarization (NMFTS). The proposed ATS model puts regularizes on pairwise sentences vectors. A new cost function based on the Frobenius norm is designed, and an algorithm is developed to minimize this function by proposing iterative updating rules. The proposed NMFTS extracts semantic content by reducing the size of documents and mapping the same sentences closely together in the latent topic space. Compared with the basic NMF, the convergence time of the proposed method does not grow. The convergence proof of the NMFTS and empirical results on the benchmark data sets show that the suggested updating rules converge fast and achieve superior results compared to other methods.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2023, 13, 1; 37--49
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model-Based Method for Acoustic Echo Cancelation and Near-End Speaker Extraction: Non-negative Matrix Factorization
Autorzy:
Agrawal, P.
Shandilya, M.
Powiązania:
https://bibliotekanauki.pl/articles/958086.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
adaptive algorithms
convergence
echo cancellation
non-negative matrix factorization (NMF)
Opis:
Rapid escalation of wireless communication and hands-free telephony creates a problem with acoustic echo in full-duplex communication applications. In this paper a simulation of model-based acoustic echo cancelation and near-end speaker extraction using statistical methods relying on nonnegative matrix factorization (NMF) is proposed. Acoustic echo cancelation using the NMF algorithm is developed and its implementation is presented, along with all positive, real time elements and factorization techniques. Experimental results are compared against the widely used existing adaptive algorithms which have a disadvantage in terms of long impulse response, increased computational load and wrong convergence due to change in near-end enclosure. All these shortcomings have been eliminated in the statistical method of NMF that reduces echo and enhances audio signal processing.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 2; 15-22
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the accuracy of detailed model inductance matrix estimation for air core winding
Autorzy:
Ahour, J. N.
Seyedtabaii, S.
Gharehpetian, G. B.
Powiązania:
https://bibliotekanauki.pl/articles/140614.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
detailed transformer model
transient
inductance matrix and homogeneous
structure
Opis:
Researchers have used various methods to determine the parameters of transformer- equivalent circuits in transient studies. But most of these previous algorithms had difficulty finding the equivalent circuit parameters in a bigger model. This paper presents a new method to extract the inductance matrix of a detailed model for an air core winding for transient studies using frequency-response measurement data. This matrix can be determined with acceptable accuracy by using the proposed method. The biggest advantage of the proposed method is a reduction in the search space, and thus, speedier problemsolving. Simulations showed that the use of the proposed method leads to better behavioural quality of a transformer winding. The simulation results of the previous and proposed methods were compared with the help of a 20/0.4 kV, 1600 kVA transformer. This comparison showed the accuracy and superiority of the proposed method.
Źródło:
Archives of Electrical Engineering; 2017, 66, 4; 787-799
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porosity measurement in CFRP
Autorzy:
Akhlaghi, Alireza
Powiązania:
https://bibliotekanauki.pl/articles/29433331.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
MAUT
Matrix Array Ultrasonic Testing
Porosity
Disbound
Delamination
Opis:
Single point, amplitude distributions and area measurements via Matrix Array Ultrasonic Testing (MAUT) software tools can provide users numerous options and versatility to characterise and quantify porosity. These measurement tools can specifically be beneficial in Live Mode when capturing data for better visualisation and will lead to a more accurate decision-making. Although the application examples highlighted in this presentation are mainly focused on porosity measurements, such ultrasonic workflow can be fine-tuned and adopted for many other inspection tasks as a quantitative test method. This case study is carried out by utilising the MAUT technology as a new and pioneer technique for porosity evaluation.
Źródło:
Badania Nieniszczące i Diagnostyka; 2023, 1-4; 37--39
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of industrial divinyl rubber by oxidative chlorophosphorylation and assess-ment of metal ion removal efficiency of obtained polymer sorbent
Autorzy:
Akhmedov, V. M.
Alfadul, S.
Maharramov, A. M.
Azizov, A. A.
Alosmanov, R. M.
Buniyad-Zadeh, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/778480.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Divinyl rubber
modification by chlorophosphorylation
nature and distribution of phosphoric functionalities in the polymer matrix
heavy metal ions
sorption
Opis:
The main goal of this study was the preparation of materials containing phosphoric functionalities on the base of industrial polymer - divinyl rubber and the assessment of their removal efficiency of heavy metals from aqueous solutions. The new method concerns the oxidative chlorophosphorylation of divinyl rubber by PCl3 with the following modification of obtained inter-mediates to create -PO(OH)2, -OPO(OH)2&enspgroups in the polymer chain. The obtained modified polymers get some new properties such as complex formation and capability for ion exchange. The nature and distribution of phosphoric functionalities in the polymer were studied by the methods of NMRand FTIR- spectroscopy, thermal analysis and scanning electron microscopy. The sorption properties of synthesized polymers towards some cations (Cu+2, Ni+2, Co+2 and Zn+2) from water solutions have been tested. It has been shown that the metal removal efficiency of prepared material depends on pH of medium, initial concentration and type of metal ions
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 2; 112-118
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automated Self-trained System of Functional Control and State Detection of Railway Transport Nodes
Autorzy:
Akhmetov, Bakhytzhan
Lakhno, Valeriy
Oralbekova, Ayaulym
Kaskatayev, Zhanat
Mussayeva, Gulmira
Powiązania:
https://bibliotekanauki.pl/articles/227158.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information intellectual technology of failure detection
functional control
learning matrix
learning algorithm
operator effectiveness criterion
nodes and aggregates
railway transport
Opis:
Automation of data processing of contactless diagnostics (detection) of the technical condition of the majority of nodes and aggregates of railway transport (RWT) minimizes the damage from failures of these systems in operating modes. This becomes possible due to the rapid detection of serious defects at the stage of their origin. Basically, in practice, the control of the technical condition of the nodes and aggregates of the RWT is carried out during scheduled repairs. It is not always possible to identify incipient defects. Consequently, it is not always possible to warn personnel (machinists, repairmen, etc.) of significant damage to the RWT systems until their complete failure. The difficulties of obtaining diagnostic information is that there is interdependence between the main nodes of the RWT. This means that if physical damage occurs at any of the RWT nodes, in other nodes there can also occur malfunctions. As the main way to improve the efficiency of state detection of the nodes and aggregates of RWT, we see the direction of giving the adaptability property for an automated data processing system from various contactless diagnostic information removal systems. The global purpose can be achieved, in particular, through the use of machine learning methods and failure recognition (recognition objects). In order to improve the operational reliability and service life of the main nodes and aggregates of RWT, there are proposed an appropriate model and algorithm of machine learning of the operator control system of nodes and aggregates. It is proposed to use the Shannon normalized entropy measure and the Kullback-Leibler distance information criterion as a criterion of the learning effectiveness of the automated detection system and operator node state control of RWT. The article describes the application of the proposed method on the example of an automatic detection system (ADS) of the state of a traction motor of an electric locomotive. There are given the test data of the model and algorithm in the MATLAB environment.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 491-496
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of 3D local orientation map calculation in the Matlab framework
Optymalizacja obliczeń trójwymiarowych lokalnych map kierunkowych z użyciem środowiska obliczeniowego Matlab
Autorzy:
Al Darwich, R.
Babout, L.
Powiązania:
https://bibliotekanauki.pl/articles/408734.pdf
Data publikacji:
2015
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
local orientation
PCA analysis
eigenvalue
eigenvector
matrix of inertia
orientacja lokalna gradientu
analiza PCA
wartość własna
wektor własny
macierz bezwładności
Opis:
This paper presents the development and evaluation of a new approach toward the optimization of 3D local orientation map calculation in the Matlab framework. This new approach can be detailed as: optimize eigenvector calculation for PCA analysis of X-ray micro tomography images of lamellar Titanium alloys image. We use two different methods to find the eigenvector of the largest eigenvalue and compare them with the Matlab built-in function (eigs). The results show a steep decrease of the calculation time using the authors' method compared to the Matlab built-in function.
W artykule przedstawiono rozwój i ocenę nowego podejścia dotyczącego optymalizacji obliczeń 3D lokalnych orientacji map w środowiska Matlab. Zastosowano dwie różne metody wyznaczania wektora własnego największej wartości własnej. Wyniki są porównywane z wynikami otrzymanymi przy pomocy wbudowanych w pakiecie Matlab funkcji wyznaczające wektory i wartości własne. Wyniki porównania pokazują redukcję czasu obliczeń przy użyciu autorskiej metody w stosunku do funkcji wbudowanej w Matlab.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 2; 22-24
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of nanoparticles reinforcements on the mechanical performance and tribological properties of aluminum 6082 alloys
Autorzy:
Al-Obaidi, Anwer J.
Tariq, Abdalameer
Dalfi, Hussein
Powiązania:
https://bibliotekanauki.pl/articles/38890058.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Al6082 alloy
SiC nanoparticles
tensile strength
wear resistance
metal matrix composite
Opis:
This research investigates the effect of using hard ceramic SiC particles on the mechanical and tribological properties of Al6082 alloy. This investigation is performed by mixing various contents of SiC as weight percentages of 0, 1, 2, 3, and 4% with Al6082. Mechanical tests, such as tensile strength and hardness tests, are adopted for this composite (Al6082/SiC) at various contents of the filler (SiC). Besides, the wear test is conducted for the Al6082/SiC composite at various normal loads (10, 15, 20, 25, and 30 N) and sliding distances (200, 400, 600, 800, and 1000 m). Taguchi’s approach is used to create the experimental runs’ matrix. The findings reveal that the mechanical properties improved with increasing the percentage of SiC reinforcement. The tensile strength and Rockwell hardness of Al6082 increased by about 24.6 and 14%, respectively, using 4% of SiC particles. Regarding the tribological behavior, the average wear of Al6082 alloy decreased with increasing the percentage of SiC reinforcement due to higher hardness of reinforcement in Al6082/SiC composite. At the same time, an increase in the normal load and sliding distance led to a decrease in wear due to increasing plastic deformation at elevated loadings and larger area contacts.
Źródło:
Engineering Transactions; 2022, 70, 4; 391-405
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mózgi w naczyniu
Brains in a vat
Autorzy:
Albiński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/950198.pdf
Data publikacji:
2012-06-16
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
brains in vats
putnam
realism
matrix
Opis:
Although there is a disagreement about how Putnam’s argument should be understood, it is possible to point to several elements of this argument which are common for many different reconstructions. In this paper I have tried to show that not all of them are unquestionable. And I want to propose a new way in which self-refutation of statement „I am a brain in a vat” may be understood. A form of this reconstruction is neutral for controversy about metaphysical realism or skepticism – it differs from the argument suggested by Putnam’s text. But I think that a story about envatted brains is simply a story about a language.
Źródło:
Filozofia Publiczna i Edukacja Demokratyczna; 2012, 1, 1; 81-92
2299-1875
Pojawia się w:
Filozofia Publiczna i Edukacja Demokratyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1202

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