Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "symmetric" wg kryterium: Temat


Tytuł:
Complementation in spaces of symmetric tensor products and polynomials
Autorzy:
Blasco, Fernando
Powiązania:
https://bibliotekanauki.pl/articles/1220111.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
symmetric tensor
polynomial
complementation
Opis:
For a locally convex space E we prove that the space of n-symmetric tensors is complemented in the space of (n+1)-symmetric tensors endowed with the projective topology. Applications and related results are also given.
Źródło:
Studia Mathematica; 1997, 123, 2; 165-173
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Undirected and directed graphs with near polynomial growth
Autorzy:
Trofimov, V.
Powiązania:
https://bibliotekanauki.pl/articles/743188.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
vertex-symmetric graph
vertex-symmetric directed graph
near polynomial growth
multivalued mapping
Opis:
The growth function of a graph with respect to a vertex is near polynomial if there exists a polynomial bounding it above for infinitely many positive integers. In the paper vertex-symmetric undirected graphs and vertex-symmetric directed graphs with coinciding in- and out-degrees are described in the case their growth functions are near polynomial.
Źródło:
Discussiones Mathematicae Graph Theory; 2003, 23, 2; 383-391
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On interpolation in NEXT(KB.Alt(2))
Autorzy:
Kostrzycka, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/749976.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
symmetric Kripke frames
interpolation
amalgamation
Opis:
We prove that there is infinitely many tabular modal logics extending KB.Alt(2) which have interpolation.
Źródło:
Bulletin of the Section of Logic; 2018, 47, 3
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of block ciphers: new possibilities
Autorzy:
Kotulski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/747866.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
block ciphers, symmetric cryptography, chaotic systems,
Opis:
Artykuł pokazuje nowe konstrukcje kodów blokowych.
The paper is an explication of how to construct block ciphers in a completely new way. The paper can be divided into three parts. In the first part the foundations of the construction of block ciphers and their security are given. In the second part the foundations and properties of chaotic systems are given. In the third part there are some considerations about using the chaotic systems to construct block ciphers. Applying the chaotic systems in symmetric cryptography is very original and a completely new idea. Chaotic systems have a lot of properties similar to the requirements for block ciphers. The main problem to solve is digitizing chaotic systems (which are continuous) to use them in a discrete application such as block ciphers. Much more consideration and investigation of this matter are needed; however, the idea is very interesting and promising.
Źródło:
Mathematica Applicanda; 2003, 31, 45/04
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some differential operators in the symmetric bundle
Autorzy:
Kimaczyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/122502.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
symmetric tensors
symmetric derivative
gradient
divergence
Weitzenböck type formula
operator różnicowy
tensory symetryczne
pochodna symetryczna
Opis:
Some natural differential operators in the bundles of symmetric tensors and symmetric tensors with values in the tangent bundle are investigated. Applications in geometry, physics and tomography are also reviewed.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 3; 27-36
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a characterization of symmetric balanced incomplete block designs
Autorzy:
Mohan, R.
Kageyama, Sanpei
Nair, M.
Powiązania:
https://bibliotekanauki.pl/articles/729802.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
symmetric balanced incomplete block (SBIB) design
Opis:
All the symmetric balanced incomplete block (SBIB) designs have been characterized and a new generalized expression on parameters of SBIB designs has been obtained. The parameter b has been formulated in a different way which is denoted by bi, i = 1, 2, 3, associating with the types of the SBIB design Di. The parameters of all the designs obtained through this representation have been tabulated while corresponding them with the suitable formulae for the number ofblocks bi and the expression Si for the convenience of practical users for constructional methods of certain designs, which is the main theme of this paper.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2004, 24, 1; 41-58
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tetravalent arc-transitive graphs of order $3p^2$
Autorzy:
Ghasemi, Mohsen
Powiązania:
https://bibliotekanauki.pl/articles/31231999.pdf
Data publikacji:
2014-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
s-transitive graphs
symmetric graphs
Cayley graphs
Opis:
Let $s$ be a positive integer. A graph is s-transitive if its automorphism group is transitive on s-arcs but not on $(s + 1)$-arcs. Let $p$ be a prime. In this article a complete classification of tetravalent s-transitive graphs of order $3p^2$ is given.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 3; 567-575
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-dimensional real symmetric spaces with maximal projection constant
Autorzy:
Chalmers, Bruce
Lewicki, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1208018.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
absolute projection constant
minimal projection
symmetric spaces
Opis:
Let V be a two-dimensional real symmetric space with unit ball having 8n extreme points. Let λ(V) denote the absolute projection constant of V. We show that $λ(V) ≤ λ(V_n)$ where $V_n$ is the space whose ball is a regular 8n-polygon. Also we reprove a result of [1] and [5] which states that $4/π = λ(l₂^{(2)}) ≥ λ(V)$ for any two-dimensional real symmetric space V.
Źródło:
Annales Polonici Mathematici; 2000, 73, 2; 119-134
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized symmetric spaces and minimal models
Autorzy:
Dumańska-Małyszko, Anna
Stępień, Zofia
Tralle, Aleksy
Powiązania:
https://bibliotekanauki.pl/articles/1311095.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
minimal model
Koszul complex
generalized symmetric space
Opis:
We prove that any compact simply connected manifold carrying a structure of Riemannian 3- or 4-symmetric space is formal in the sense of Sullivan. This result generalizes Sullivan's classical theorem on the formality of symmetric spaces, but the proof is of a different nature, since for generalized symmetric spaces techniques based on the Hodge theory do not work. We use the Thomas theory of minimal models of fibrations and the classification of 3- and 4-symmetric spaces.
Źródło:
Annales Polonici Mathematici; 1996, 64, 1; 17-35
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The unit ball of \(L_s(^2l_{\infty}^3)\)
Autorzy:
Kim, Sung Guen
Powiązania:
https://bibliotekanauki.pl/articles/1912848.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Symmetric bilinear forms
extreme points
exposed points
Opis:
We classify the extreme and exposed symmetric bilinear forms of the unit ball of the space \({\mathcal L}_s(^2l_{\infty}^3)\).
Źródło:
Commentationes Mathematicae; 2017, 57, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On generalized Hom-functors of certain symmetric monoidal categories
Autorzy:
Vogel, Hans
Powiązania:
https://bibliotekanauki.pl/articles/729029.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
symmetric monoidal category
monoidal functor
Hom-functor
Opis:
It is well-known that for each object A of any category C there is the covariant functor $H^{A}: C → Set$, where $H^{A}(X)$ is the set C[A,X] of all morphisms out of A into X in C for an arbitrary object X ∈ |C| and $H^{A}(φ)$, φ ∈ C[X,Y], is the total function from C[A,X] into C[A,Y] defined by C[A,X] ∋ u → uφ ∈ C[A,Y].
If C̲ is a dts-category, then $H^{A}$ is in a natural manner a d-monoidal functor with respect to
$\tilde{H^{A}} = $\tilde{H^{A}}⟨X,Y⟩: C[A,X] × C[A,Y] → C[A,X⊗Y]$,
$((u₁,u₂) ↦ d_{A}(u₁⊗u₂)) | X,Y ∈ |C|)$
and
$i_{H^{A}}:{∅} → C[A,I], (∅ ↦ t_{A})$.
This construction can be generalized to functors $H^{e}$ from any dhth∇s-category K̲ into the category P̲a̲r̲ related to arbitrary subidentities e of K̲ (cf. S [3]). Each such generalized Hom-functor $H^{e}$ related to any subidentity $e ≤ 1_{A}$, $o_{A,A} ≠ e$, turns out to be a monoidal dhth∇s-functor from K̲ into P̲a̲r̲.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2002, 22, 1; 47-71
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structures argumentales de prédicats N Prép N. Emplois réciproques et non réciproques
Argument structures of N Prep N predicates. Reciprocal and non reciprocal uses
Autorzy:
Kaliska, Agnieszka K.
Powiązania:
https://bibliotekanauki.pl/articles/1048303.pdf
Data publikacji:
2019-05-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
argument structure
reciprocity
symmetric relations
manner predicates
Opis:
The purpose of this article is to provide the lexical analysis of predicates such as face à face (‘face to face’) and côte à côte (‘side by side’), which are generally reciprocal and symmetric. Some of them are also used in an unusual way, that is, the structures in which they appear do not meet the requirements set for symmetric constructions. This imbalance, as we will show, has for the origin a semantic difference between the arguments x and y which must belong to the same semantic class if we want them to be in a symmetric relation. The question of semantic similarity within the argument structures is thus of greater importance for the semantic completeness of the reciprocal predicates. The question will be for us to recognize if, when a semantic difference occurs, we would have to deal with different (non reciprocal) meanings and if so how to describe them.
Źródło:
Studia Romanica Posnaniensia; 2019, 46, 1; 75-95
0137-2475
2084-4158
Pojawia się w:
Studia Romanica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ring-like structures with unique symmetric difference related to quantum logic
Autorzy:
Dorninger, Dietmar
Länger, Helmut
Maczyński, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/729037.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
generalized Boolean quasiring
symmetric difference
quantum logic
Opis:
Ring-like quantum structures generalizing Boolean rings and having the property that the terms corresponding to the two normal forms of the symmetric difference in Boolean algebras coincide are investigated. Subclasses of these structures are algebraically characterized and related to quantum logic. In particular, a physical interpretation of the proposed model following Mackey's approach to axiomatic quantum mechanics is given.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2001, 21, 2; 239-253
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subdirectly irreducible non-idempotent left symmetric left distributive groupoids
Autorzy:
Jeřábek, Emil
Kepka, Tomáš
Stanovský, David
Powiązania:
https://bibliotekanauki.pl/articles/729183.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
groupoid
left distributive
left symmetric
subdirectly irreducible
Opis:
We study groupoids satisfying the identities x·xy = y and x·yz = xy·xz. Particularly, we focus our attention at subdirectlyirreducible ones, find a description and charecterize small ones.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2005, 25, 2; 235-257
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symmetric Banach *-algebras: invariance of spectrum
Autorzy:
Barnes, Bruce
Powiązania:
https://bibliotekanauki.pl/articles/1206024.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
*-inverse closed
inverse closed
symmetric Banach *-algebra
Opis:
Let A be a Banach *-algebra which is a subalgebra of a Banach algebra B. In this paper, assuming that A is symmetric, various conditions are given which imply that A is inverse closed in B.
Źródło:
Studia Mathematica; 2000, 141, 3; 251-261
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operators in divergence form and their Friedrichs and Krein extensions
Autorzy:
Arlinskii, Y.
Kovalev, Y.
Powiązania:
https://bibliotekanauki.pl/articles/254828.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
symmetric operator
divergence form
Friedrichs extension
Krein extension
Opis:
For a densely defined nonnegative symmetric operator A = L*(2)L1 in a Hilbert space, constructed from a pair L1 ⊂ L2 of closed operators, we give expressions for the Friedrichs and Krein nonnegative selfadjoint extensions. Some conditions for the equality (L*(2)L1)* = L*(1)L2 are obtained. Applications to 1D nonnegative Hamiltonians, corresponding to point interactions, are given.
Źródło:
Opuscula Mathematica; 2011, 31, 4; 501-517
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the representation of uncountable symmetric basic sets and its applications
Autorzy:
L. Hernandez, Francisco
Troyanski, Stanimir
Powiązania:
https://bibliotekanauki.pl/articles/1292447.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
symmetric basis
Orlicz sequence spaces
Lorentz sequence spaces
Opis:
It is shown that every uncountable symmetric basic set in an F-space with a symmetric basis is equivalent to a basic set generated by one vector. We apply this result to investigate the structure of uncountable symmetric basic sets in Orlicz and Lorentz spaces.
Źródło:
Studia Mathematica; 1993, 107, 3; 287-304
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on strict K-monotonicity of some symmetric function spaces
Autorzy:
Ciesielski, Maciej
Kolwicz, Paweł
Płuciennik, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/745027.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Koethe space, K-monotonicity, strict K-monotonicity, symmetric
Opis:
We discuss some sufficient and necessary conditions for strict K-monotonicity of some important concrete symmetric spaces. The criterion for strict monotonicity of the Lorentz space \(\Gamma _{p,w}\) with \(0\)
Źródło:
Commentationes Mathematicae; 2013, 53, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solutions for network games and symmetric group representations
Autorzy:
Sánchez-Pérez, Joss
Powiązania:
https://bibliotekanauki.pl/articles/406635.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
network game
axiomatic solutions
representation theory
symmetric group
Opis:
We present the relationship between network games and representation theory of the group of permutations of the set of players (nodes), and also offer a different perspective to study solutions for this kind of problems. We then provide several applications of this approach to the cases with three and four players.
Źródło:
Operations Research and Decisions; 2019, 29, 4; 95-123
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On SαS density function
Autorzy:
Mazurkiewicz, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/729728.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
stable distribution
symmetric stable distribution
moments
scale mixture
Opis:
In this paper, we study some analytical properties of the symmetric α-stable density function.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2005, 25, 1; 91-101
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symmetric polynomials in the 2D Fourier equation
Autorzy:
Biernat, G.
Lara-Dziembek, S.
Pawlak, E.
Powiązania:
https://bibliotekanauki.pl/articles/122935.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
block matrices
symmetric polynomials
macierze blokowe
wielomiany symetryczne
Opis:
The work is a continuation of the method of calculating the determinant of the block matrix in the two-dimensional case. In this paper we use the Finite Differences Method and the symmetric polynomials.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 4; 5-12
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Wear Resistance in Polycrystalline and Monocrystalline Iron
Autorzy:
Liu, Zhiming
Zhang, Qiang
Liu, Fangying
Zhang, Hezhe
Powiązania:
https://bibliotekanauki.pl/articles/2203723.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
molecular dynamics
polycrystalline
centro symmetric analysis
abrasive wear
Opis:
In the present research, we used molecular dynamics simulation to determine the effect of cutting parameters on micro-grain boundary structures and Burgers vector distribution in single crystal iron and polycrystalline iron materials. The result showed that the destruction of the lattice in polycrystalline iron caused by the cutting tool was restricted to the contact surface area. In addition, in the precision machining process, a higher refining grain was observed on the iron surface. During the cutting process of single crystal iron, large-scale slip occurred along the <111> crystal direction on the {110} crystal plane. And the slip presented an annular shape.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 15--20
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of voltage unbalance estimation in electric power networks
Autorzy:
Olczykowski, Z.
Wąsowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/262813.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
voltage unbalance
symmetric component
differential coefficient
differential angle
Opis:
Methods of voltage unbalance estimation based on the theory of symmetrical components and the method of differential — angular coefficients of asymmetry have been discussed. It has been proposed the last one to estimate the asymmetry of square absolute voltage value, as useful for distorted processes.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 71-76
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Knots in $S^2 x S^1$ derived from Sym(2, ℝ)
Autorzy:
Lee, Sang
Lim, Yongdo
Park, Chan-Young
Powiązania:
https://bibliotekanauki.pl/articles/1205027.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
geodesic
symmetric matrix
Shilov boundary
2-periodic knot
Opis:
We realize closed geodesics on the real conformal compactification of the space V = Sym(2, ℝ) of all 2 × 2 real symmetric matrices as knots or 2-component links in $S^2 × S^1$ and show that these knots or links have certain types of symmetry of period 2.
Źródło:
Fundamenta Mathematicae; 2000, 164, 3; 241-252
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symmetric polynomials in the 3D Fourier equation
Autorzy:
Biernat, G.
Lara-Dziembek, S.
Pawlak, E.
Powiązania:
https://bibliotekanauki.pl/articles/122274.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
block matrices
symmetric polynomials
macierze blokowe
wielomiany symetryczne
Opis:
The work is a continuation of the method of calculating the determinant of the block matrix in the three-dimensional case. In this article the symmetric polynomials are used.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 1; 5-12
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Counterexample to a conjecture on the structure of bipartite partitionable graphs
Autorzy:
Gibson, Richard
Mynhardt, Christina
Powiązania:
https://bibliotekanauki.pl/articles/743437.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
domination
prism fixer
symmetric dominating set
bipartite graph
Opis:
A graph G is called a prism fixer if γ(G×K₂) = γ(G), where γ(G) denotes the domination number of G. A symmetric γ-set of G is a minimum dominating set D which admits a partition D = D₁∪ D₂ such that $V(G)-N[D_i] = D_j$, i,j = 1,2, i ≠ j. It is known that G is a prism fixer if and only if G has a symmetric γ-set.
Hartnell and Rall [On dominating the Cartesian product of a graph and K₂, Discuss. Math. Graph Theory 24 (2004), 389-402] conjectured that if G is a connected, bipartite graph such that V(G) can be partitioned into symmetric γ-sets, then G ≅ C₄ or G can be obtained from $K_{2t,2t}$ by removing the edges of t vertex-disjoint 4-cycles. We construct a counterexample to this conjecture and prove an alternative result on the structure of such bipartite graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2007, 27, 3; 527-540
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symmetric Hamilton Cycle Decompositions of Complete Multigraphs
Autorzy:
Chitra, V.
Muthusamy, A.
Powiązania:
https://bibliotekanauki.pl/articles/29788703.pdf
Data publikacji:
2013-09-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
complete multigraph
1-factor
symmetric Hamilton cycle
decomposition
Opis:
Let $n ≥ 3$ and $⋋ ≥ 1$ be integers. Let $⋋K_n$ denote the complete multigraph with edge-multiplicity $⋋$. In this paper, we show that there exists a symmetric Hamilton cycle decomposition of $⋋K_{2m}$ for all even $⋋ ≥ 2$ and $m ≥ 2$. Also we show that there exists a symmetric Hamilton cycle decomposition of $⋋K_{2m} − F$ for all odd $⋋ ≥ 3$ and $m ≥ 2$. In fact, our results together with the earlier results (by Walecki and Brualdi and Schroeder) completely settle the existence of symmetric Hamilton cycle decomposition of $⋋K_n$ (respectively, $⋋K_n − F$, where $F$ is a 1-factor of $⋋K_n$) which exist if and only if $⋋(n − 1)$ is even (respectively, $⋋(n − 1)$ is odd), except the non-existence cases n ≡ 0 or 6 (mod 8) when ⋋ = 1
Źródło:
Discussiones Mathematicae Graph Theory; 2013, 33, 4; 695-707
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-attribute decision-making based on q-rung dual hesitant power dual Maclaurin symmetric mean operator and a new ranking method
Autorzy:
Li, Li
Wang, Jun
Ji, Chunliang
Powiązania:
https://bibliotekanauki.pl/articles/2175106.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
q-rung dual hesitant fuzzy sets
power geometric
dual Maclaurin symmetric mean
power dual Maclaurin symmetric mean
multi-attribute decision-making
Opis:
The ability of q-rung dual hesitant fuzzy sets (q-RDHFSs) in dealing with decision makers’ fuzzy evaluation information has received much attention. This main aim of this paper is to propose new aggregation operators of q-rung dual hesitant fuzzy elements and employ them in multi-attribute decision making (MADM). In order to do this, we first propose the power dual Maclaurin symmetric mean (PDMSM) operator by integrating the power geometric (PG) operator and the dual Maclaurin symmetric mean (DMSM). The PG operator can reduce or eliminate the negative influence of decision makers’ extreme evaluation values, making the final decision results more reasonable. The DMSM captures the interrelationship among multiple attributes. The PDMSM takes the advantages of both PG and DMSM and hence it is suitable and powerful to fuse decision information. Further, we extend the PDMSM operator to q-RDHFSs and propose q-rung dual hesitant fuzzy PDMSM operator and its weighted form. Properties of these operators are investigated. Afterwards, a new MADM method under q-RDHFSs is proposed on the basis on the new operators. Finally, the effectiveness of the new method is testified through numerical examples.
Źródło:
Archives of Control Sciences; 2022, 32, 3; 627--658
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Near-field multiple optical trapping using high order axially symmetric polarized beams
Autorzy:
Zhou, Z
Tan, Q
Zhu, L
Yang, C
Powiązania:
https://bibliotekanauki.pl/articles/174886.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical trapping
surface plasmon polaritons
axially symmetric polarized beams
Opis:
The near-field multiple optical trapping using high order axially symmetric polarized beams (ASPBs) is studied for the first time. First, a near-field optical trapping scheme is proposed based on the Kretschmann–Raether configuration, and surface plasmon polaritons (SPPs) field distributions excited by incident ASPBs are calculated, which present a multi-focal-spot pattern and the size of spots is much smaller than that of the diffraction limitation. Then, the gradient forces on Rayleigh dielectric particles formed by the multi-focal-spot focused field are computed, which indicates that multiple ultra-small particles with the refractive index higher than that of the ambient medium can be trapped simultaneously on the metal surface. The number and size of trapped particles can be manipulated by flexibly modifying the polarization order of incident beams, which is expected to enhance the capability of traditional optical trapping systems and provide a solution for massively parallel optical trapping of nanometer-sized particles.
Źródło:
Optica Applicata; 2013, 43, 2; s. 287-296
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adjointness between theories and strict theories
Autorzy:
Vogel, Hans-Jürgen
Powiązania:
https://bibliotekanauki.pl/articles/728926.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
symmetric monoidal category
dhts-category
partial theory
adjoint functor
Opis:
The categorical concept of a theory for algebras of a given type was foundet by Lawvere in 1963 (see [8]). Hoehnke extended this concept to partial heterogenous algebras in 1976 (see [5]). A partial theory is a dhts-category such that the object class forms a free algebra of type (2,0,0) freely generated by a nonempty set J in the variety determined by the identities ox ≈ o and xo ≈ o, where o and i are the elements selected by the 0-ary operation symbols.
If the object class of a dhts-category forms even a monoid with unit element I and zero element O, then one has a strict partial theory.
In this paper is shown that every J-sorted partial theory corresponds in a natural manner to a J-sorted strict partial theory via a strongly d-monoidal functor. Moreover, there is a pair of adjoint functors between the category of all J-sorted theories and the category of all corresponding J-sorted strict theories.
This investigation needs an axiomatic characterization of the fundamental properties of the category Par of all partial function between arbitrary sets and this characterization leads to the concept of dhts- and dhth∇s-categories, respectively (see [5], [11], [13]).
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2003, 23, 2; 163-212
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Categories of functors between categories with partial morphisms
Autorzy:
Vogel, Hans-Jürgen
Powiązania:
https://bibliotekanauki.pl/articles/729097.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
symmetric monoidal category
dhts-category
Hoehnke category
Hoehnke theory
monoidal functor
d-monoidal functor
dht-symmetric functor
functor composition
cartesian product
Opis:
It is well-known that the composition of two functors between categories yields a functor again, whenever it exists. The same is true for functors which preserve in a certain sense the structure of symmetric monoidal categories. Considering small symmetric monoidal categories with an additional structure as objects and the structure preserving functors between them as morphisms one obtains different kinds of functor categories, which are even dt-symmetric categories.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2005, 25, 1; 39-87
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The symmetric tensor product of a direct sum of locally convex spaces
Autorzy:
M Ansemil, José
Floret, Klaus
Powiązania:
https://bibliotekanauki.pl/articles/1218462.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
symmetric tensor products
continuous n-homogeneous polynomials
tensor topologies
Opis:
An explicit representation of the n-fold symmetric tensor product (equipped with a natural topology τ such as the projective, injective or inductive one) of the finite direct sum of locally convex spaces is presented. The formula for $⨂^n_{τ,s} (F_1⨁ F_2)$ gives a direct proof of a recent result of Díaz and Dineen (and generalizes it to other topologies τ) that the n-fold projective symmetric and the n-fold projective "full" tensor product of a locally convex space E are isomorphic if E is isomorphic to its square $E^2$.
Źródło:
Studia Mathematica; 1998, 129, 3; 285-295
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On weakly symmetric generalized trans-sasakian manifold
Autorzy:
Das, Levejoy S.
Nivas, Ram
Agnihotri, Rupali
Powiązania:
https://bibliotekanauki.pl/articles/1912861.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Trans-Sasakian manifold
weakly symmetric
Riemannian manifold
curvature tensor
Opis:
In this paper, we have defined the weakly symmetric generalized Trans-Sasakian manifold \(G(WS)_n\) and it has been shown that on such manifold if any two of the vector fields \(\lambda,\gamma,\tau\), defined by equation (0.3) are orthogonal to \(\xi\), then the third will also be orthogonal to \(\xi\). We have also proved that the scalar curvature \(r\) of weakly symmetric generalized Trans-Sasakian manifold \(G(WS)_n\), \((n > 2)\) satisfies the equation \(r = 2n(\alpha^2 − \beta^2)\), where \(\alpha\) and \(\beta\) are smooth function and \(\gamma\not=\tau\).
Źródło:
Commentationes Mathematicae; 2014, 54, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Adaptive Differential Evolution with Hybrid Rules of Perturbation for Dynamic Optimization
Autorzy:
Trojanowski, K.
Raciborski, M.
Kaczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/308439.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
adaptive differential evolution
dynamic optimization
symmetric a-stable distribution
Opis:
In this paper an adaptive differential evolution approach for dynamic optimization problems is studied. A new benchmark suite Syringa is also presented. The suite allows to generate test-cases from a multiple number of dynamic optimization classes. Two dynamic benchmarks: Generalized Dynamic Benchmark Generator (GDBG) and Moving Peaks Benchmark (MPB) have been simulated in Syringa and in the presented research they were subject of the experimental research. Two versions of adaptive differential evolution approach, namely the jDE algorithm have been heavily tested: the pure version of jDE and jDE equipped with solutions mutated with a new operator. The operator uses a symmetric ?-stable distribution variate for modification of the solution coordinates.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 4; 20-30
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cryptographic Protection of Removable Media with a USB Interface for Secure Workstation for Special Applications
Autorzy:
Chudzikiewicz, J.
Furtak, J.
Powiązania:
https://bibliotekanauki.pl/articles/309355.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
filter driver
removable media protection
symmetric and asymmetric encryption
Opis:
This paper describes one of the essential elements of Secure Workstation for Special Applications (SWSA) to cryptographic protection of removable storage devices with USB interface. SWSA is a system designed to process data classified to different security domains in which the multilevel security is used. The described method for protecting data on removable Flash RAM protects data against unauthorized access in systems processing the data, belonging to different security domains (with different classification levels) in which channel the flow of data must be strictly controlled. Only user authenticated by the SWSA can use the removable medium in the system, and the data stored on such media can be read only by an authorized user by the SWSA. This solution uses both symmetric and asymmetric encryption algorithms. The following procedures are presented: creating protected a file (encryption), generating signatures for the file and reading (decryption) the file. Selected elements of the protection systems implementation of removable Flash RAM and the mechanisms used in implementation the Windows have been described.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 3; 22-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Les principes de la description syntagmatique des constructions fondées sur la présence des expressions symétriques
Syntactic modeling of sentences based on symmetric expressions - fundamental methodological assumptions
Autorzy:
Nkollo, Mikołaj
Powiązania:
https://bibliotekanauki.pl/articles/1052729.pdf
Data publikacji:
2007-03-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Semantically based grammar
Syntactic modeling of sentences
Symmetric expressions
Opis:
Structural modeling of sentences based on symmetric expressions has to be designed so as to take into account the diversity of syntactic functions covered by this class of language signs. It implies taking into consideration particular features of symmetric predicates depending on the part of speech they represent. Fundamental methodological assumptions of this approach are to be sought in so-called "semantically based grammar".
Źródło:
Studia Romanica Posnaniensia; 2007, 34; 83-99
0137-2475
2084-4158
Pojawia się w:
Studia Romanica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
About a certain relation between two polynomials of the same degree
Autorzy:
Piwowarczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/229447.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roots of polynomials
symmetric polynomials
companion matrix
eigenvalues
transformations
Opis:
This article presents several different methods for solving the problem of how to find a certain relation defined in chapter 2. The first method deals with the identities known in the theory of symmetric polynomials as the elements of a certain vector space. The second method is designed around the matrix transformations between symmetric polynomials. The third method is designed around the property of a linear operator and its characteristic polynomial. The fourth method is designed in the area of complex numbers, and introduces the multiplication group of 'complex roots of one'. Significant improvement in the third and fourth method is made by introducing so called 'block method'. It facilitates all calculations by making them much shorter. The article ends with an example showing symmetry and regularity of all procedures. Finally, the article shows how to solve the problem for any degree n of the polynomial, and for any degree k. At the end of the paper solutions for n < 5 and k < 5 are tabulated.
Źródło:
Archives of Control Sciences; 2011, 21, 1; 85-103
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallel Algorithms for Forward and Back Substitution in Linear Algebraic Equations of Finite Element Method
Autorzy:
Fialko, Sergiy
Powiązania:
https://bibliotekanauki.pl/articles/308616.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
finite element method
multithreaded parallelization
sparse symmetric matrices
triangular solution
Opis:
This paper considers several algorithms for parallelizing the procedure of forward and back substitution for high-order symmetric sparse matrices on multi-core computers with shared memory. It compares the proposed approaches for various finite-element problems of structural mechanics which generate sparse matrices of different structures.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 4; 20-29
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interative method of calculation of originally circular-symmetric structures
Iteracyjna metoda obliczania modyfikowanych konstrukcji pierwotnie kołowo-symetrycznych
Autorzy:
Pruputniewicz, S.
Pruputniewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/396386.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mechanika konstrukcji
konstrukcje modyfikowane
circular-symmetric structures
modification
cyclic matrices
Opis:
The paper proposes an iterative method of calculation of modified, originally circular-symmetric structures. The method applies a cyclical (or quasi-cyclical) stiffness matrix of the original structure in each iteration step. A lot of modified systems which differ considerably from circular-symmetric ones (lack of some elements, strengthening, additional supports) have been calculated. The obtained results indicate that although the algorithm is not unconditionally convergent, exact solutions are often received even for considerable changes in the original structure. Operations on considerably smaller matrices than the full ones describing a system completely, compensate for the necessity of performing a greater number of iterations than when applying other methods of modification.
W pracy zaproponowano iteracyjny sposób obliczania modyfikowanych konstrukcji pierwotnie kołowo-symetrycznych, w którym na każdym kroku iteracji korzysta sięz cyklicznej (lub quasicyklicznej) macierzy sztywności konstrukcji pierwotnej. Wykonano obliczenia wielu modyfikowanych układów znacznie różniących się od kołowo-symetrycznych (brak niektórych elementów, wzmocnienia, dodatkowe podpory). Uzyskane wyniki wskazują na to, że chociaż algorytm nie jest bezwarunkowo zbieżny to nawet przy znacznych zmianach w konstrukcji pierwotnej uzyskuje się często dokładne rozwiązania. Działanie na macierzach znacznie mniejszych od pełnych macierzy opisujących układ znacząco rekompensuje koniecznośś wykonania wiekszej liczby iteracji niż przy korzystaniu z innych metod.
Źródło:
Civil and Environmental Engineering Reports; 2005, 1; 243-259
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The boundary Harnack principle for the fractional Laplacian
Autorzy:
Bogdan, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1220146.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
boundary Harnack principle
symmetric stable processes
harmonic functions
Lipschitz domains
Opis:
We study nonnegative functions which are harmonic on a Lipschitz domain with respect to symmetric stable processes. We prove that if two such functions vanish continuously outside the domain near a part of its boundary, then their ratio is bounded near this part of the boundary.
Źródło:
Studia Mathematica; 1997, 123, 1; 43-80
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A characterization of maximal regular ideals in lmc algebras
Autorzy:
Fragoulopoulou, Maria
Powiązania:
https://bibliotekanauki.pl/articles/1293115.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
symmetric lmc*-algebra
LFQ-algebra
maximal ideal space
Lindelöf space
Opis:
A question of Warner and Whitley concerning a nonunital version of the Gleason-Kahane-Żelazko theorem is considered in the context of nonnormed topological algebras. Among other things it is shown that a closed hyperplane M of a commutative symmetric F*-algebra E with Lindelöf Gel'fand space is a maximal regular ideal iff each element of M belongs to some closed maximal regular ideal of E.
Źródło:
Studia Mathematica; 1992, 103, 1; 41-49
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of the representations of symmetric groups to characterizing solutions of games in partition function form
Autorzy:
Sánchez-Pérez, J.
Powiązania:
https://bibliotekanauki.pl/articles/406330.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
games in partition function form
value
representation theory
symmetric group
Opis:
A different perspective from the more “traditional” approaches to studying solutions of games in partition function form has been presented. We provide a decomposition of the space of such games under the action of the symmetric group, for the cases with three and four players. In particular, we identify all the irreducible subspaces that are relevant to the study of linear symmetric solutions. We then use such a decomposition to derive a characterization of the class of linear and symmetric solutions, as well as of the class of linear, symmetric and efficient solutions.
Źródło:
Operations Research and Decisions; 2014, 24, 2; 97-122
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A categorical model of predicate linear logic
Autorzy:
Demeterová, E.
Mihályi, D.
Novitzká, V.
Powiązania:
https://bibliotekanauki.pl/articles/122570.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
linear type theory
predicate linear logic
symmetric monoidal closed category
Opis:
Linear logic is one of the logical systems with special properties suitable for describing real processes used in computer science. It enables one to specify dynamics, non determinism, consecutive processes and important resources as memory and time on syntactic level. Moreover, its deduction system enables one to verify specified properties. Constructing an appropriate model based on categories can serve for modeling various program systems in the wide spectrum of computer science. Mainly, propositional linear logic is used for these purposes. The expression power of linear logic significantly grows by extending propositional logic with predicates and quantifiers. Our paper concerns itself with defining predicate linear logic together with its deduction system and our main aim is to construct a categorical model of predicate linear logic as a symmetric monoidal closed category.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 1; 27-42
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract
Autorzy:
Mushtaq, Tahir
Kamran, Ahmad
Qureshi, Muhammad Zubair Akbar
Iqbal, Zafar
Powiązania:
https://bibliotekanauki.pl/articles/31339832.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
symmetric
digital waveguide
vocal tract
delay lines
rectilinear uniform grid
Opis:
Simulation of wave propagation in the three-dimensional (3D) modeling of the vocal tract has shown significant promise for enhancing the accuracy of speech production. Recent 3D waveguide models of the vocal tract have been designed for better accuracy but require a lot of computational tasks. A high computational cost in these models leads to novel work in reducing the computational cost while retaining accuracy and performance. In the current work, we divide the geometry of the vocal tract into four equal symmetric parts with the introduction of two axial perpendicular planes, and the simulation is performed on only one part. A novel strategy is defined to implement symmetric conditions in the mesh. The complete standard 3D digital waveguide model is assumed as a benchmark model. The proposed model is compared with the benchmark model in terms of formant frequencies and efficiency. For the demonstration, the vowels /ɔ/, /i/, /ɛ/, /ɑ/, and /u/ have been selected for the simulations. According to the results, the benchmark and current models are nearly identical in terms of frequency profiles and formant frequencies. Still the current model is three times more effective than the benchmark model.
Źródło:
Archives of Acoustics; 2023, 48, 3; 317-324
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Worm-like locomotion as a problem of nonlinear dynamics
Ruch robaczkowy jako zagadnienie dynamiki nieliniowej
Autorzy:
Zimmermann, K.
Zeidis, I.
Powiązania:
https://bibliotekanauki.pl/articles/280753.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
worm-like motion
modelling
oscillations
non-symmetric friction
peristaltic motion
Opis:
Non-pedal forms of locomotion show their advantages in inspection techniques or applications to the medical technology for diagnostic systems and minimally invasive surgery. Observing the locomotion of worms, one recognizes conversion of (mostly periodic) internal and internally driven motions into a change in the external position (undulatory locomotion). This paper presents some theoretical and practical investigations of worm-like motion systems that have the earthworm as a live prototype. The locomotion of worms can be described by introduction of nonlinear non-symmetric frictional forces. In the first part of the paper these systems are modelled in form of straight chains of interconnected mass points. The ground contact can be described by non-symmetric dry friction. The investigations are concentrated on motion in a tube or channel, and on motion on a horizontal pIane as well. In both cases, the body is modeled as a viscous Newtonian fluid. The effect of the mass flow through a cross section on the disturbance and material parameters (viscosity, dimensions) is discussed. The paper presents first prototyp es of technically implemented artificial worms.
Znana w naturze forma transportu i przemieszczania się z miejsca na miejsce bez użycia odnóży, tzw. forma niekrocząca, kryje w sobie ogromny potencjał aplikacyjny w technikach badawczych oraz medycynie, zwłaszcza w diagnostyce i nieinwazyjnej chirurgii. W obserwacji pełzania robaków stwierdza się konwersję ruchu wewnętrznego, lub wewnętrznie indukowanego (głównie periodycznego) w mierzalne przemieszczenie zewnętrzne (tzw. ruch falujący). W pracy przedstawiono badania teoretyczne i uwagi praktyczne na temat sztucznych układów przemieszczających się ruchem robaczkowym, których żywym prototypem może być zwykła dżdżownica. Taki rodzaj transportu opisano poprzez wprowadzenie do modelu matematycznego nieliniowej i niesymetrycznej charakterystyki tarcia. W pierwszej części pracy układy zamodelowano prostymi łańcuchami punktów materialnych. Kontakt z podłożem odwzorowano niesymetryczną siłą tarcia suchego. Analizę skoncentrowano na pełzaniu w rurze i kanale oraz ruchu po poziomej powierzchni. We wszystkich przypadkach poruszające się ciało zamodelowano jako ciecz Newtonowską. Przedyskutowano efekt przepływu masy przez przekrój poprzeczny na zakłócenia w ruchu i zmianę parametrów ciała (lepkość, wymiary). Zaprezentowano również pierwsze prototypy sztucznych robaków przeznaczonych do zadań technicznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2007, 45, 1; 179-187
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A general boundary value problem and its Weyl function
Autorzy:
Ryzhov, V.
Powiązania:
https://bibliotekanauki.pl/articles/255861.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
abstract boundary value problem
symmetric operators
Green formula
Weyl function
Opis:
We study the abstract boundary value problem defined in terms of the Green identity and introduce the concept of Weyl operator function M(·) that agrees with other definitions found in the current literature. In typical cases of problems arising from the multidimensional partial equations of mathematical physics the function M(·) takes values in the set of unbounded densely defined operators acting on the auxiliary boundary space. Exact formulae are obtained and essential properties of M(·) are studied. In particular, we consider boundary problems defined by various boundary conditions and justify the well known procedure that reduces such problems to the "equation on the boundary" involving the Weyl function, prove an analogue of the Borg-Levinson theorem, and link our results to the classical theory of extensions of symmetric operators.
Źródło:
Opuscula Mathematica; 2007, 27, 2; 305-331
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cryptosystems using subgroup distortion
Autorzy:
Chatterji, I.
Kahrobaei, D.
Lu, N. Y.
Powiązania:
https://bibliotekanauki.pl/articles/375856.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hyberbolic groups
symmetric key
distortion
grupy hiperboliczne
klucz symetryczny
zniekształcenie
Opis:
In this paper we propose cryptosystems based on subgroup distortion in hyperbolic groups. We also include concrete examples of hyperbolic groups as possible platforms.
Źródło:
Theoretical and Applied Informatics; 2017, 29, 1-2; 14-24
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Influence of Parts ́ Materials Properties on the Assembly Orientation
Autorzy:
Václav, Štefan
Sobrino, Daynier Rolando Delgado
Zajačko, Ivan
Pokorný, Peter
Powiązania:
https://bibliotekanauki.pl/articles/2064705.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
assembly orientation
degree of symmetry
complexity
laboriousness
symmetric
material component
Opis:
The material of a part or component has a decisive impact on the complexity and laboriousness of assembly process. Thus, solid, fragile and flexible parts and components are all handled in a different way. The present paper classifies some of the most common types of materials parts are usually made of, while also analyzing their impact on the assembly process. In mechanical engineering, solid parts are most often used, given that these do not require special measures in known assembly orientation and handling techniques. However, such solid materials pose several challenges as well, and this mainly due to their several specific shapes, which means a specific problem in gripping and especially in their orientation during the assembly process. In this regard, the paper also addresses with one of the most important and assembly-troublesome properties of these solid parts, which the degree of symmetry. The degree of symmetry of solid parts has a direct impact on the complexity and laboriousness of their orientation in assembly. The last part of the paper focuses on the theoretical basis for the calculation of complexity and laboriousness in the assembly of parts.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 422--434
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimality conditions for preinvex functions using symmetric derivative
Autorzy:
Rastogi, Sachin
Iqbal, Akhlad
Rajan, Sanjeev
Powiązania:
https://bibliotekanauki.pl/articles/2204082.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
invex set
preinvex function
symmetric derivative
Fritz John optimality conditions
Opis:
As a generalization of convex functions and derivatives, in this paper, the authors study the concept of a symmetric derivative for preinvex functions. Using symmetrical differentiation, they discuss an important characterization for preinvex functions and define symmetrically pseudo-invex and symmetrically quasi-invex functions. They also generalize the first derivative theorem for symmetrically differentiable functions and establish some relationships between symmetrically pseudo-invex and symmetrically quasi-invex functions. They also discuss the Fritz John type optimality conditions for preinvex, symmetrically pseudo-invex and symmetrically quasi-invex functions using symmetrical differentiability.
Źródło:
Operations Research and Decisions; 2022, 32, 4; 91--101
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of water impact for symmetric wedge by experimental and numerical methods
Autorzy:
Nikfarjam, M.
Koto, J.
Yaakob, O. B.
Seif, M. S.
Aref, A.
Powiązania:
https://bibliotekanauki.pl/articles/266182.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
hydrodynamika
ciśnienie uderzenia
statek
symmetric wedge
hydrodynamic impact
impact pressure
Opis:
Evaluation of impact loads when a ship hull contacts the wave surface is one of the main issues for researchers who are going to design the structure of marine vehicles. In this paper, the results of experimental tests and numerical modeling of the distribution of pressure on different wedge-shaped models are reported and the effect of related parameters such as the deadrise angles, the weight and drop heights, is assessed. The output of analyses and the results can give appropriate approximations of the maximum impact pressures for the geometries that are similar to marine vehicle’s hull sections to estimate the hydrodynamic impact loads in different sea-states. In addition, other effective parameters such as the impact speed, acceleration and water entry process can be used for evaluating the performance of such crafts.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 221-230
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conversion: non-réciproque – réciproque. Variantes syntaxiques
Reciprocal transformation. Syntactic varieties
Autorzy:
Nkollo, Mikołaj
Powiązania:
https://bibliotekanauki.pl/articles/1051622.pdf
Data publikacji:
2010-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
reciprocity
reciprocal construction
grammatical vs. lexical exponents
reflexive
symmetric relations
Opis:
The present paper is devoted to the concept of reciprocity and to reciprocal expressions, which are divided into two main classes. Those belonging to the first of them signify reciprocity on their own, i.e. without any additional reciprocal markers. The other class contains expressions that acquire ability to refer to reciprocal states of affairs only as a result of appropriate transformations. Different reciprocal markers – grammatical, lexical and quantifying – are singled out and thoroughly characterized. Their use results in converting non-reciprocal signs into reciprocal ones. They are applied according to the part of speech of a modified term. The conclusion to be drawn from this analysis revolves around the discrepancy between morphological and syntactic means of reciprocal transformation. While the former ones are rather scanty, the latter are largely used in contemporary French.
Źródło:
Studia Romanica Posnaniensia; 2010, 37, 2; 15-27
0137-2475
2084-4158
Pojawia się w:
Studia Romanica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Summing multi-norms defined by Orlicz spaces and symmetric sequence space
Autorzy:
Blasco, Oscar
Powiązania:
https://bibliotekanauki.pl/articles/745023.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
multinorms
(p,q)-summing norm
Orlicz space
symmetric sequence space
Opis:
We develop the notion of the \((X_1,X_2)\)-summing power-norm based on a~Banach space \(E\), where \(X_1\) and \(X_2\) are symmetric sequence spaces. We study the particular case when \(X_1\) and \(X_2\) are Orlicz spaces \(\ell_\Phi\) and \(\ell_\Psi\) respectively and analyze under which conditions the \((\Phi, \Psi)\)-summing power-norm becomes a~multinorm. In the case when \(E\) is also a~symmetric sequence space \(L\), we compute the precise value of \(\|(\delta_1,\cdots,\delta_n)\|_n^{(X_1,X_2)}\) where \((\delta_k)\) stands for the canonical basis of \(L\), extending known results for the \((p,q)\)-summing power-norm based on the space \(\ell_r\) which corresponds to \(X_1=\ell_p\), \(X_2=\ell_q\), and \(E=\ell_r\).
Źródło:
Commentationes Mathematicae; 2016, 56, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady Oseen’s flow past a deformed sphere: an analytical approach
Autorzy:
Srivastava, D. K.
Yadav, R. R.
Yadav, S.
Powiązania:
https://bibliotekanauki.pl/articles/280226.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Stokes drag
Oseen’s drag
axially symmetric arbitrary body
axial flow
Opis:
In a recent authors’ paper, the general expression of Stokes drag experienced by a deformed sphere in both longitudinal and transverse flow situations was calculated in terms of the deformation parameter up to the second order. In this paper, Oseen’s correction to the axial Stokes drag on the deformed sphere is presented by using Brenner’s formula in general, first and then applied to prolate and oblate the deformed spheroid up to the second order of the deformation parameter. Numerical values of Oseen’s correction is obtained with respect to the deformation parameter and Reynolds number. The corresponding variations are depicted in figures. Some particular cases of a needle shaped body and flat circular disk are considered and found to be in good agreement with those existing in the literature. The import ant applications are also highlighted.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 661-673
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the structure of halfdiagonal-halfterminal-symmetric categories with diagonal inversions
Autorzy:
Vogel, Hans-Jürgen
Powiązania:
https://bibliotekanauki.pl/articles/728750.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
halfdiagonal-halfterminal-symmetric category
diagonal inversion
partial order relation
subidentity
equation
Opis:
The category of all binary relations between arbitrary sets turns out to be a certain symmetric monoidal category Rel with an additional structure characterized by a family $d = (d_{A}: A → A⨂ A | A ∈ |Rel|)$ of diagonal morphisms, a family $t = (t_{A}: A → I | A ∈ |Rel|)$ of terminal morphisms, and a family $∇ = (∇_{A}: A ⨂ A → A | A ∈ |Rel|)$ of diagonal inversions having certain properties. Using this properties in [11] was given a system of axioms which characterizes the abstract concept of a halfdiagonal-halfterminal-symmetric monoidal category with diagonal inversions (hdht∇s-category). Besides of certain identities this system of axioms contains two identical implications. In this paper is shown that there is an equivalent characterizing system of axioms for hdht∇s-categories consisting of identities only. Therefore, the class of all small hdht∇-symmetric categories (interpreted as hetrogeneous algebras of a certain type) forms a variety and hence there are free theories for relational structures.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2001, 21, 2; 139-163
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model of a radially symmetric cloud of self-attracting particles
Autorzy:
Nadzieja, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/1340313.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
asymptotic behavior
cloud of particles
nonlinear parabolic equation
radially symmetric solutions
Opis:
We consider a parabolic equation which describes the gravitational interaction of particles. Existence of solutions and their convergence to stationary states are studied.
Źródło:
Applicationes Mathematicae; 1995-1996, 23, 2; 169-178
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromatic Properties of the Pancake Graphs
Autorzy:
Konstantinova, Elena
Powiązania:
https://bibliotekanauki.pl/articles/31341647.pdf
Data publikacji:
2017-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Pancake graph
Cayley graphs
symmetric group
chromatic number
total chromatic number
Opis:
Chromatic properties of the Pancake graphs Pn, n ⩾ 2, that are Cayley graphs on the symmetric group Symn generated by prefix-reversals are investigated in the paper. It is proved that for any n ⩾ 3 the total chromatic number of Pn is n, and it is shown that the chromatic index of Pn is n − 1. We present upper bounds on the chromatic number of the Pancake graphs Pn, which improve Brooks’ bound for n ⩾ 7 and Katlin’s bound for n ⩽ 28. Algorithms of a total n-coloring and a proper (n − 1)-coloring are given.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 3; 777-787
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Every reasonably sized matrix group is a subgroup of $S_∞$
Autorzy:
Kallman, Robert
Powiązania:
https://bibliotekanauki.pl/articles/1205071.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
infinite symmetric group
matrix groups
nonarchimedian absolute values
field extensions
topological groups
Opis:
Every reasonably sized matrix group has an injective homomorphism into the group $S_∞$ of all bijections of the natural numbers. However, not every reasonably sized simple group has an injective homomorphism into $S_∞$.
Źródło:
Fundamenta Mathematicae; 2000, 164, 1; 35-40
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some properties of the spectral radius of a set of matrices
Autorzy:
Czornik, A.
Jurgaś, P.
Powiązania:
https://bibliotekanauki.pl/articles/908427.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promień spektralny
podpromień spektralny
macierz symetryczna
spectral radius
spectral subradius
symmetric matrices
Opis:
In this paper we show new formulas for the spectral radius and the spectral subradius of a set of matrices. The advantage of our results is that we express the spectral radius of any set of matrices by the spectral radius of a set of symmetric positive definite matrices. In particular, in one of our formulas the spectral radius is expressed by singular eigenvalues of matrices, whereas in the existing results it is expressed by eigenvalues.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 2; 183-188
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Symmetric Block Ciphering Processors using techniques of configuring the Soft-Cores
Budowa procesorów do symetrycznej blokowej szyfracji z zastosowaniem techniki "soft-cores"
Autorzy:
Melnyk, V.
Powiązania:
https://bibliotekanauki.pl/articles/154628.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
szyfrowanie blokowe
konfigurowanie procesorów szyfrowania
symmetric block ciphering
configuring the Soft Core
Opis:
In a paper a concepts of the Symmetric Block Ciphering Soft-Cores configuring are highlighted. Standard approaches of the hardware configuring whichare realized in VHDL language are considered, their disadvantages are exposed. Alternative technologies of the Smmetric Block Ciphering Soft-Cores configuring are proposed. These technologies are implemented using specific libraries. Proposed technologies have advantages in comparison with the standard technologies. They were used for development a set of Symmetric Block Ciphering processors. Forty-six variations of the DES and Triple DES processors are proposed.
W publikacji przeanalizowano koncepcje konfigurowania modeli programowych procesorów symetrycznego blokowego szyfrowania. Dokonano przeglądu standardowych metod konfigurowania zrealizowanych w języku VHDL oraz określono ich wady. Zaproponowane alternatywne technologie konfigurowania modeli programowych procesorów symetrycznego blokowego szyfrowania. Powyższe technologie zostały zrealizowane z wykorzystaniem wyspecjalizowanych bibliotek programowych. W porównaniu do standardowych proponowane technologie są lepsze. Na ich podstawie opracowano szereg procesorów symetrycznego blokowego szyfrowania.
Źródło:
Pomiary Automatyka Kontrola; 2003, R. 49, nr 7-8, 7-8; 59-62
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Non-Symmetric Nash and Kalai–Smorodinsky Bargaining Solutions
Autorzy:
Gerchak, Y.
Powiązania:
https://bibliotekanauki.pl/articles/375971.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Nash bargaining solution
Non-Symmetric
Kalai–Smorodinsky Bargaining Solution
supply chain coordination
Opis:
Recently, in some negotiation application areas, the usual assumption that negotiators are symmetric has been relaxed. In particular, weights have been introduced to the Nash Bargaining Solution to reflect the different powers of the players. Yet, we feel that operating with non-symmetric bargaining solutions and their implications is not well understood. We analyze the properties and optimization of the non-symmetric Nash Bargaining Solution and of a non-symmetric Kalai–Smorodinsky Bargaining Solution. We provide extensive comparative statics, then comment on the implications of the concepts in supply chain coordination contexts.
Źródło:
Decision Making in Manufacturing and Services; 2015, 9, 1; 55-61
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the arm spacing effect on symmetric and asymmetric Y-shape optical power splitters: plasmonic interactions between gold nanorings
Autorzy:
Ahmadivand, A.
Powiązania:
https://bibliotekanauki.pl/articles/174115.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasmonics
symmetric and asymmetric
splitter and Y-structure
nanoring
offset distance
transmitted power
Opis:
In this paper, we investigated specific properties and features of several kinds of Y-splitters based on gold nanorings arrays which are surrounded by SiO2 host substance, to be used at C-band spectrum (λ ~ 1550 nm). The comparison between two kinds of splitters shows that the symmetric splitter demonstrates better performance than the asymmetric splitter at given wavelength with high efficiency and transmittance (power ratio). Calculations proved that the transmitted power percentage was approximately ~47.5% in the well-organized splitter. It is shown that the offset distance plays an important role in the quality of the optical energy division and transmission through the plasmonic waveguide. The influence of increasing and decreasing in the offset distance was demonstrated numerically by snapshots. Hence, choosing and determining the appropriate value for the offset distance lead to the structure with lower losses and higher percentage in energy transmission. Ultimately, the optical behavior of an asymmetric nanostructure with unequal distances between the arms and the main array is investigated and its applications and possible purposes are introduced.
Źródło:
Optica Applicata; 2014, 44, 1; 123-133
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic behaviour and approximation of eigenvalues for unbounded block Jacobi matrices
Autorzy:
Malejki, M.
Powiązania:
https://bibliotekanauki.pl/articles/255505.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
symmetric unbounded Jacobi matrix
block Jacobi matrix
tridiagonal matrix
point spectrum
eigenvalue
asymptotics
Opis:
The research included in the paper concerns a class of symmetric block Jacobi matrices. The problem of the approximation of eigenvalues for a class of a self-adjoint unbounded operators is considered. We estimate the joint error of approximation for the eigenvalues, numbered from 1 to N, for a Jacobi matrix J by the eigenvalues of the finite submatrix J(n) of order pn x pn, where N = max{k ∈ N : k ≤ rpn} and r ∈ (0, 1) is suitably chosen. We apply this result to obtain the asymptotics of the eigenvalues of J in the case p = 3.
Źródło:
Opuscula Mathematica; 2010, 30, 3; 311-330
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A parallel algorithm of icsym forcomplexsymmetric linear systems in quantum chemistry
Autorzy:
Zhang, Y.
Lv, Q.
Xiao, M.
Xie, G.
Breitkopf, P.
Powiązania:
https://bibliotekanauki.pl/articles/305677.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
complex symmetric linear systems
parallel computing
improved conjugate gradient-type iterative algorithm (ICSYM)
Opis:
Computational effort is a common issue for solving large-scale complex symmetric linear systems, particularly in quantum chemistry applications. In order to alleviate this problem, we propose a parallel algorithm of improved conjugate gradient-type iterative (ICSYM). Using three-term recurrence relation and or- thogonal properties of residual vectors to replace the tridiagonalization process of classical CSYM, which allows to decrease the degree of the reduce-operator from two to one communication at each iteration and to reduce the amount of vector updates and vector multiplications. Several numerical examples are implemented to show that high performance of proposed improved version is obtained both in convergent rate and in parallel efficiency.
Źródło:
Computer Science; 2018, 19 (4); 385-401
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On uncountable collections of continua and their span
Autorzy:
Repovš, Dušan
Skopenkov, Arkadij
Ščepin, Evgenij
Powiązania:
https://bibliotekanauki.pl/articles/967010.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
uncountable collection of compacta
deleted product
chainable continua
span
equivariant maps
symmetric span
Opis:
We prove that if the Euclidean plane $ℝ^2$ contains an uncountable collection of pairwise disjoint copies of a tree-like continuum X, then the symmetric span of X is zero, sX = 0. We also construct a modification of the Oversteegen-Tymchatyn example: for each ε > 0 there exists a tree $X ⊂ ℝ^2$ such that σX < ε but X cannot be covered by any 1-chain. These are partial solutions of some well-known problems in continua theory.
Źródło:
Colloquium Mathematicum; 1996, 69, 2; 289-296
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards theory of C-symmetries
Autorzy:
Kuzhel, S.
Sudilovskaya, V.
Powiązania:
https://bibliotekanauki.pl/articles/255003.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Krein space
J-self-adjoint operator
J-symmetric operator
Friedrichs extension
C-symmetry
Opis:
The concept of C-symmetry originally appeared in PT-symmetric quantum mechanics is studied within the Krein spaces framework.
Źródło:
Opuscula Mathematica; 2017, 37, 1; 65-80
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symbolic approach to the general cubic decomposition of polynomial sequences. Results for several orthogonal and symmetric cases
Autorzy:
Mesquita, T. A.
Rocha, Z. Da
Powiązania:
https://bibliotekanauki.pl/articles/255977.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
symmetric polynomials
orthogonal polynomials
cubic decomposition
symbolic computations
Mathematica 8.0.1.0.
Opis:
We deal with a symbolic approach to the cubic decomposition (CD) of polynomial sequences - presented in a previous article referenced herein - which allows us to compute explicitly the first elements of the nine component sequences of a CD. Properties are investigated and several experimental results are discussed, related to the CD of some widely known orthogonal sequences. Results concerning the symmetric character of the component sequences are established.
Źródło:
Opuscula Mathematica; 2012, 32, 4; 675-687
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Affine analogues of the Sasaki-Shchepetilov connection
Autorzy:
Robaszewska, Maria
Powiązania:
https://bibliotekanauki.pl/articles/744685.pdf
Data publikacji:
2016-12-01
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
connection on a vector bundle
associated vector bundle
connection form
locally symmetric connection
Opis:
For two-dimensional manifold M with locally symmetric connection ∇ and with ∇-parallel volume element vol one can construct a flat connection on the vector bundle TM ⊕ E, where E is a trivial bundle. The metrizable case, when M is a Riemannian manifold of constant curvature, together with its higher dimension generalizations, was studied by A.V. Shchepetilov [J. Phys. A: 36 (2003), 3893-3898]. This paper deals with the case of non-metrizable locally symmetric connection. Two flat connections on TM ⊕ (ℝ × M) and two on TM ⊕ (ℝ2 × M) are constructed. It is shown that two of those connections – one from each pair – may be identified with the standard flat connection in ℝN, after suitable local affine embedding of (M,∇) into ℝN.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2016, 15
2300-133X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional models for Nevanlinna families
Autorzy:
Behrndt, J.
Hassi, S.
Snoo, H. de
Powiązania:
https://bibliotekanauki.pl/articles/255065.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
symmetric operator
selfadjoint extension
boundary relation
Weyl family
functional model
reproducing kernel Hilbert space
Opis:
The class of Nevanlinna families consists of R-symmetric holomorphic multivalued functions on C \ R with maximal dissipative (maximal accumulative) values on C+ (C-, respectively) and is a generalization of the class of operator-valued Nevanlinna functions. In this note Nevanlinna families are realized as Weyl families of boundary relations induced by multiplication operators with the independent variable in reproducing kernel Hilbert spaces.
Źródło:
Opuscula Mathematica; 2008, 28, 3; 233-245
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On bifurcation intervals for nonlinear eigenvalue problems
Autorzy:
Przybycin, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/1294164.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
bifurcation interval
symmetric operator
Sturm-Liouville problem
Dirichlet problem
Leray-Schauder degree
characteristic values
Opis:
We give a sufficient condition for [μ-M, μ+M] × {0} to be a bifurcation interval of the equation u = L(λu + F(u)), where L is a linear symmetric operator in a Hilbert space, μ ∈ r(L) is of odd multiplicity, and F is a nonlinear operator. This abstract result provides an elementary proof of the existence of bifurcation intervals for some eigenvalue problems with nondifferentiable nonlinearities. All the results obtained may be easily transferred to the case of bifurcation from infinity.
Źródło:
Annales Polonici Mathematici; 1999, 71, 1; 39-46
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Affine surfaces with parallel shape operators
Autorzy:
Jelonek, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1312195.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Blaschke structure
affine locally symmetric surface
affine shape operator
equiaffine structure
affine normal field
Opis:
We study affine nondegenerate Blaschke hypersurfaces whose shape operators are parallel with respect to the induced Blaschke connections. We classify such surfaces and thus give an exact classification of extremal locally symmetric surfaces, first described by F. Dillen.
Źródło:
Annales Polonici Mathematici; 1991-1992, 56, 2; 179-186
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypergeometric series and the Riemann zeta function
Autorzy:
Chu, Wenchang
Powiązania:
https://bibliotekanauki.pl/articles/1390850.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
the Riemann zeta function
the harmonic numbers
hypergeometric series
the gamma function
symmetric functions
Źródło:
Acta Arithmetica; 1997, 82, 2; 103-118
0065-1036
Pojawia się w:
Acta Arithmetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of spintronic devices for application in random access memory
Modelowanie urządzeń spintronicznych do zastosowania w pamięci o dostępie swobodnym RAM
Autorzy:
Politanskyi, Ruslan
Vistak, Maria
Veryga, Andriy
Ruda, Tetyana
Powiązania:
https://bibliotekanauki.pl/articles/408022.pdf
Data publikacji:
2020
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
STT-MRAM
spin-polarized current
binary symmetric channel
prąd spolaryzowany spinowo
symetryczny kanał binarny
Opis:
The article analyzes the physical processes that occur in spin-valve structures during recording process which occurs in high-speed magnetic memory devices.Considered are devices using magnetization of the ferromagnetic layer through transmitting magnetic moment bypolarized spin (STT-MRAM).Basic equations are derived to model the information recording process in the model of symmetric binary channel.Because the error probability arises from the magnetization process, a model of the magnetization process is formed, which is derived from the Landau-Lifshitz-Gilbert equations under the assumption of a single-domain magnet. The choice of a single-domain model is due to the nanometer size of the flat magnetic layer. The developed method of modeling the recording process determines the dependence of such characteristics as the bit error probability and the rate of recording on two important technological characteristics of the recording process: the value of the current and its duration. The endresult and the aim of the simulation is to determine the optimal values of the current and its duration at which the speed of the recording process is the highest for a given level of error probability. The numerical values of the transmission rate and error probability were obtained for a wide range of current values (10–1500 μA) and recording time of one bit (1–70 ns),and generally correctly describe the process of information transmission. The calculated data were compared with the technical characteristics of existing industrial devices and devices which are the object of the scientific research.The resulting model can be used to simulate devices using different values of recording currents: STT-MRAM series chips using low current values (500-100 μA), devices in the stage of technological design and using medium current values (100–500 μA) and devices that are the object of experimental scientific research and use high currents (500–1000 μA).The model can also be applied to simulate devices with different data rates, which have different requirements for both transmission speed and bit error probability. In this way, the model can be applied to both high-speed memory devices in computer systems and signal sensors, which are connected to sensor networks or connected to the IoT.
W tym artykule analizowane są procesy fizyczne zachodzące w strukturach zaworów spinowych podczas procesu rejestrowania informacji, który występuje w urządzeniach z szybką pamięcią magnetyczną. Obiektem badańsą urządzenia wykorzystujące magnetyzację warstwy ferromagnetycznej poprzez przenoszenie momentu magnetycznego za pomocą spolaryzowanegospinu(STT-MRAM).Wyprowadzono podstawowe równania potrzebne do modelowania procesu rejestrowania informacji w modelu symetrycznego kanału binarnego.W związku z tym, żeprawdopodobieństwobłędu wynika z procesu magnesowania,stworzonyjest model procesu magnesowania, który został wyprowadzonyz równań Landaua-Lifshitza-Hilberta przy założeniu magnesu jednodomenowego.Wybór modelu jednodomenowego wynika z nanometrycznej wielkości płaskiej warstwy magnetycznej. Opracowana metoda modelowania procesu rejestrowaniainformacjiokreśla zależność wskaźników, takich jakprawdopodobieństwo błędnegobitu i szybkość transmisji informacji, od dwóch ważnych właściwości procesu rejestrowania: natężenia prądu i czasu jego trwania. Końcowym rezultatem i zarazem celem symulacji jest określenie optymalnych wartości natężenia prądu i czasutrwania rejestracji informacji, przy których prędkość procesu zapisu będzie najwyższa dla danego stopnia prawdopodobieństwa błędu. Uzyskano wartości liczbowe dla szybkości transmisji i prawdopodobieństwa błędu dla szerokiego zakresu natężenia prądu (10–1500 μA) i czasu rejestracji jednego bitu (1–70 ns), które ogólnie poprawnie opisują proces transmisji informacji. Wyniki obliczeń zostały porównane ze specyfikacją techniczną istniejących urządzeń przemysłowych i urządzeń będących obiektami badań naukowych.Powstały model można wykorzystać do symulacji urządzeń wykorzystujących różne wartości natężenia prądu: układy szeregowe STT-MRAM wykorzystujące niskie natężenie prądu (500–100 μA), urządzenia na etapie projektowania technologicznego, które wykorzystują średnie natężenie prądu (100–500 μA) oraz urządzenia będące obiektami eksperymentalnych badań naukowych, które wykorzystują wysokie natężenie prądu (500–1000 μA). Model można również zastosować w symulacjachurządzeń o różnych szybkościach transmisji danych, które mają różne wymagania dotyczące zarówno szybkości transmisji, jak i prawdopodobieństwa błędu w jednym bicie informacji.W ten sposób model ten można wykorzystać zarówno w urządzeniach z szybką pamięcią w systemach komputerowych, jak i w czujnikach sygnałów, które są podłączone do sieci czujników lub podłączone do Internetu rzeczy.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2020, 10, 1; 62-65
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On convergence for the square root of the Poisson kernel in symmetric spaces of rank 1
Autorzy:
Rönning, Jan-Olav
Powiązania:
https://bibliotekanauki.pl/articles/1219076.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
maximal function
square root of the Poisson kernel
convergence region
symmetric space of rank 1
Opis:
Let P(z,β) be the Poisson kernel in the unit disk , and let $P_{λ}f(z) = ʃ_{∂} P(z,φ)^{1//2+λ} f(φ)dφ$ be the λ -Poisson integral of f, where $f ∈ L^p(∂)$. We let $P_{λ}f$ be the normalization $P_{λ}f//P_{λ}1$. If λ >0, we know that the best (regular) regions where $P_{λ}f$ converges to f for a.a. points on ∂ are of nontangential type. If λ =0 the situation is different. In a previous paper, we proved a result concerning the convergence of $P_0f$ toward f in an $L^p$ weakly tangential region, if $f ∈ L^p(∂)$ and p > 1. In the present paper we will extend the result to symmetric spaces X of rank 1. Let f be an $L^p$ function on the maximal distinguished boundary K/M of X. Then $P_{0}f(x)$ will converge to f(kM) as x tends to kM in an $L^p$ weakly tangential region, for a.a. kM ∈ K/M.
Źródło:
Studia Mathematica; 1997, 125, 3; 219-229
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band copulas as spectral measures for two-dimensional stable random vectors
Autorzy:
Bojarski, Jacek
K. Misiewicz, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/729780.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Symmetric stable random vector
spectral measure
canonical spectral measure
copula
James corelation for random variables
Opis:
In this paper, we study basic properties of symmetric stable random vectors for which the spectral measure is a copula, i.e., a distribution having uniformly distributed marginals.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2003, 23, 1; 69-75
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aplikacja Maple do kryptograficznej ochrony folderów, utworzonych na pamięciach chmurowych, dyskach twardych i na nośnikach wymiennych
Maple implementation of cryptographic protection of folders created in cloud storage, hard disks and portable memory devices
Autorzy:
Kościelny, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/131933.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Wyższa Szkoła Informatyki Stosowanej Horyzont
Tematy:
szyfr strumieniowy
struktura bajtowa
szyfrowanie symetryczne plików
Maple byte-oriented stream-cipher
symmetric file encryption
Opis:
Opisano sposób realizacji aplikacji do szyfrowania i deszyfrowania folderów. Aplikację zrealizowano stosując program Maple 2016. Jest to program wyjątkowo łatwy w obsłudze, ponieważ użytkownik stosuje wyłącznie lewy klawisz myszy, wybierając folder, który będzie przetwarzany oraz jedną z operacji, czyli szyfrowanie lub deszyfrowanie folderu. Dlatego też aplikację można polecić specjalistom średnio biegłym w informatyce, jak filolodzy, ekonomiści, prawnicy, osoby duchowne, itp., którzy w swoich komputerach posiadają foldery z poufnymi dokumentami. Program posiada prosty graficzny interfejs użytkownika i przeznaczony jest głównie do kryptograficznej ochrony plików przechowywanych w folderach tworzonych w pamięciach chmurowych, (`cloud storage`) oraz na dyskach twardych i na nośnikach wymiennych. Aplikacja niezawodnie chroni pliki przed nieupoważnionym dostępem.
It has been shown how to implement a Maple worksheet which performs cryptographic protection of folders created in cloud storage, hard disks and portable memory devices by means of byte-oriented stream-cipher using the addition in GF(256).
Źródło:
Biuletyn Naukowy Wrocławskiej Wyższej Szkoły Informatyki Stosowanej. Informatyka; 2016, 16; 9-13
2082-9892
Pojawia się w:
Biuletyn Naukowy Wrocławskiej Wyższej Szkoły Informatyki Stosowanej. Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slowly vibrating axially symmetric bodies-transverse flow
Autorzy:
Srivastava, D. K.
Powiązania:
https://bibliotekanauki.pl/articles/1839883.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyn newtonowski
przepływ osiowy
metoda Stokesa
Stokes drag
axially symmetric bodies
Newtonian fluid
axial flow
Opis:
Stokes drag on axially symmetric bodies vibrating slowly along the axis of symmetry placed under a uniform transverse flow of the Newtonian fluid is calculated. The axially symmetric bodies of revolution are considered with the condition of continuously turning tangent. The results of drag on sphere, spheroid, deformed sphere, egg-shaped body, cycloidal body, Cassini oval, and hypocycloidal body are found to be new. The numerical values of frictional drag on a slowly vibrating needle shaped body and flat circular disk are calculated as particular cases of deformed sphere.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 226-250
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$L^p$-$L^q$-Time decay estimate for solution of the Cauchy problem for hyperbolic partial differential equations of linear thermoelasticity
Autorzy:
Gawinecki, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1313322.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
decay estimates
partial differential equations
Cauchy problem
symmetric hyperbolic system of first order
linear thermoelasticity
Opis:
We prove the $L^p$-$L^q$-time decay estimates for the solution of the Cauchy problem for the hyperbolic system of partial differential equations of linear thermoelasticity. In our proof based on the matrix of fundamental solutions to the system we use Strauss-Klainerman's approach [12], [5] to the $L^p$-$L^q$-time decay estimates.
Źródło:
Annales Polonici Mathematici; 1991, 54, 2; 135-145
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spherical fuzzy power partitioned Maclaurin Symmetric Mean Operators and their application in Multiple Attribute Group Decision Making
Autorzy:
Zhang, Huiyuan
Cai, Qiang
Wei, Guiwu
Powiązania:
https://bibliotekanauki.pl/articles/27312003.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
spherical fuzzy sets
partitioned Maclaurin symmetric mean operator
power average operator
multiple attribute group decision making
Opis:
Spherical fuzzy sets (SFSs) provide more free space for decision makers (DMs) to express preference information from four aspects: approval, objection, abstention and refusal. The partitioned Maclaurin symmetric mean (PMSM) operator is an effective information fusion tool, which can fully capture the interrelationships among any multiple attributes in the same block whereas attributes in different block are unrelated. Therefore, in this paper, we first extend PMSM operator to spherical fuzzy environment and develop spherical fuzzy PMSM (SFPMSM) operator as well as spherical fuzzy weighted PMSM (SFWPMSM) operator. Meanwhile, we discuss some properties and special cases of these two operators. To diminish the impact of extreme evaluation values on decision-making results, then we integrate power average (PA) operator and PMSM operator to further develop spherical fuzzy power PMSM (SFPPMSM) operator and spherical fuzzy weighted power PMSM (SFWPPMSM) operator and also investigate their desirable properties. Subsequently, a new multiple attribute group decision making (MAGDM) method is established based on SFWPPMSM operator under spherical fuzzy environment. Finally, two numerical examples are used to illustrate the proposed method, and comparative analysis with the existing methods to further testy the validity and superiority of the proposed method.
Źródło:
Archives of Control Sciences; 2023, 33, 1; 179--238
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opory skrawania gleby narzędziami o kształcie klina prostego i symetrycznego klina ukośnego
Resistance of soil to a simple wedge-shaped tool and a symmetric diagonal-wedge tool
Autorzy:
Lejman, K.
Powiązania:
https://bibliotekanauki.pl/articles/286764.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
gleba
opór skrawania
klin prosty
symetryczny klin ukośny
soil
cutting resistance
plain wedge
symmetric diagonal wedge
Opis:
Przedstawiono wyniki badań wpływu kształtu narzędzia na charakter przebiegu oporu w funkcji głębokości skrawania, prędkości skrawania i zwięzłości gleby. Badania sił działających na narzędzia o kształcie klina prostego i symetrycznego klina ukośnego o kątach wzniosu 30° i 50° oraz szerokościach 9 i 14 cm przeprowadzono w warunkach polowych w glebie gliniastej średniej przy wilgotności 12-15%. Stwierdzono, że kształt narzędzia wpływa istotnie na charakter zmian oporu w funkcji głębokości skrawania, natomiast nie wpływa na ten charakter w funkcji zwięzłości gleby. Przebiegi oporów w funkcji prędkości skrawania różnią się istotnie jedynie w przypadku kąta wzniosu 50° i szerokości 14 cm. W zdecydowanej większości przypadków wartości oporu skrawania klinem prostym były wyższe od oporu dla symetrycznego klina ukośnego.
This paper presents results of studia on soil resistance. Research was conducted in field conditions on loamy clay soil. Models of symmetrical skew wedge-shaped and simple wedge-shaped tillage tools of 30° and 50° lift angle and with 9 cm and 14 cm tool width were used. Influence of the tool shape on the resistance force in relationship to the cone index of soil, depth of work and cutting speed were analysed. Analysis of the results obtained has proved that the tool shape significantly influences the resistance forces as far as the depth is concerned but does not influence the function of the cone index. Courses of soil resistance as a function of cutting speed do not differ significantly only for the tool width and tool angle (14 cm, 50°). Resistance forces of simple wedge-shaped tools were higher than those of symmetric diagonal wedge-shaped tools.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 3, 3; 279-288
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lightweight compression with encryption based on asymmetric numeral systems
Autorzy:
Duda, Jarosław
Niemiec, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2201015.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
symmetric cryptography
lightweight cryptography
data compression
entropy coding
kryptografia symetryczna
kryptografia lekka
kompresja danych
kodowanie entropijne
Opis:
Data compression combined with effective encryption is a common requirement of data storage and transmission. Low cost of these operations is often a high priority in order to increase transmission speed and reduce power usage. This requirement is crucial for battery-powered devices with limited resources, such as autonomous remote sensors or implants. Well-known and popular encryption techniques are frequently too expensive. This problem is on the increase as machine-to-machine communication and the Internet of Things are becoming a reality. Therefore, there is growing demand for finding trade-offs between security, cost and performance in lightweight cryptography. This article discusses asymmetric numeral systems-an innovative approach to entropy coding which can be used for compression with encryption. It provides a compression ratio comparable with arithmetic coding at a similar speed as Huffman coding; hence, this coding is starting to replace them in new compressors. Additionally, by perturbing its coding tables, the asymmetric numeral system makes it possible to simultaneously encrypt the encoded message at nearly no additional cost. The article introduces this approach and analyzes its security level. The basic application is reducing the number of rounds of some cipher used on ANS-compressed data, or completely removing an additional encryption layer when reaching a satisfactory protection level.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2023, 33, 1; 45--55
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semimartingale measure in the investigation of Stratonovich-type stochastic integrals and inclusions
Autorzy:
Syga, Joachim
Powiązania:
https://bibliotekanauki.pl/articles/729758.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
forward
backward and symmetric integral
time-reversible process
semimartingale measure
set-valued stochastic integral
Stratonovich inclusion
Opis:
A random measure associated to a semimartingale is introduced. We use it to investigate properties of several types of stochastic integrals and properties of the solution set of Stratonovich-type stochastic inclusion.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 7-27
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ układu czynnikowego na pomiar preferencji konsumentów metodą Maximum Difference Scaling
Impact of factorial design on the measurement of consumers’ preferences using Maximum Difference Scaling
Autorzy:
Bartłomowicz, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/424793.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
measurement of consumers’ preferences
asymmetric
symmetric and balanced factorial designs
Maximum Difference Scaling (MaxDiff)
R program
Opis:
Measurement of consumer preferences is one of the most important elements of marketing research. In the measurement of consumers’ preferences Maximum Difference Scaling can be used. In this method, a fractional factorial design is used as the experiment, where a limited set of profiles (product or service) is taken into account. The resignation of full factorial design, in which the number of profiles exceeds the ability of respondents to assess, means choosing one of many possible factorial designs. The aim of this article is to present the results of the measurement of consumers’ preferences based on different fractional factorial designs using Maximum Difference Scaling. The article presents the results of measurement of consumers’ preferences using asymmetric, symmetric and balanced factorial designs and the MaxDiff R package.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2015, 2 (48); 33-43
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A random walk version of Robbins problem: small horizon
Autorzy:
Allaart, Pieter
Allen, Andrew
Powiązania:
https://bibliotekanauki.pl/articles/953267.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
robbins' problem
stopping time
symmetric random walk
expected rank
proces ornsteina-uhlenbecka
floc
estymacja
rozkłas stabilny
Opis:
In Robbins' problem of minimizing the expected rank, a finite sequence of $n$ independent, identically distributed random variables are observed sequentially and the objective is to stop at such a time that the expected rank of the selected variable (among the sequence of all $n$ variables) is as small as possible. In this paper we consider an analogous problem in which the observed random variables are the steps of a symmetric random walk. Assuming continuously distributed step sizes, we describe the optimal stopping rules for the cases $n=2$ and $n=3$ in two versions of the problem: a ``full information" version in which the actual steps of the random walk are disclosed to the decision maker; and a ``partial information" version in which only the relative ranks of the positions taken by the random walk are observed. When $n=3$, the optimal rule and expected rank depend on the distribution of the step sizes. We give sharp bounds for the optimal expected rank in the partial information version, and fairly sharp bounds in the full information version.
Źródło:
Mathematica Applicanda; 2019, 47, 2
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A parallel block Lanczos algorithm and its implementation for the evaluation of some eigenvalues of large sparse symmetric matrices on multicomputers
Autorzy:
Guarracino, M. R.
Perla, F.
Zanetti, P.
Powiązania:
https://bibliotekanauki.pl/articles/908413.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
cluster architecture
symmetric block Lanczos algorithm
sparse matrices
parallel eigensolver
algorytm Lanczosa
macierze rzadkie
architektura klastrowa
Opis:
In the present work we describe HPEC (High Performance Eigenvalues Computation), a parallel software package for the evaluation of some eigenvalues of a large sparse symmetric matrix. It implements an efficient and portable Block Lanczos algorithm for distributed memory multicomputers. HPEC is based on basic linear algebra operations for sparse and dense matrices, some of which have been derived by ScaLAPACK library modules. Numerical experiments have been carried out to evaluate HPEC performance on a cluster of workstations with test matrices from Matrix Market and Higham’s collections. A comparison with a PARPACKroutine is also detailed. Finally, parallel performance is evaluated on random matrices, using standard parameters.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 2; 241-249
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Block ciphers on the basis of reversible cellular automata
Szyfry blokowe na podstawie odwracalnych automatów komórkowych
Autorzy:
Tanasyuk, Yuliya
Burdeinyi, Petro
Powiązania:
https://bibliotekanauki.pl/articles/408746.pdf
Data publikacji:
2020
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
block cipher
symmetric encryption algorithm
reversible cellular automata
szyfr bloku
algorytm szyfrowania symetrycznego
odwracalny automat komórkowy
Opis:
The given paper is devoted to the software development of block cipher based on reversible one-dimensional cellular automata and the study of their statistical properties. The software implementation of the proposed encryption algorithm is performed in C# programming language in Visual Studio 2017. The paper presents specially designed approach for key generation. To ensure a desired cryptographic stability, the shared secret parameters can be adjusted in order to contain information needed for creating substitution tables, defining reversible rules, and hiding the final data. For the first time, it is suggested to create substitution tables based on iterations of a cellular automaton that is initialized by the key data.
Niniejszy artykuł poświęcony jest rozwojowi oprogramowania szyfrów blokowych opartychna odwracalnych jednowymiarowych automatach komórkowych oraz badaniu ich właściwości statystycznych. Zastosowanie oprogramowania w proponowanym algorytmie kodowania wykonywane jest w języku programowania C# w Visual Studio 2017. Artykuł przedstawia specjalnie zaprojektowane podejście do generowania klucza. Aby zapewnić pożądaną stabilność kryptograficzną, dostosowane mogą zostać wspólne tajne parametry w taki sposób,aby zawierały informacje wymagane dla stworzenia tabel substytucyjnych, określające zasadyodwracalne oraz ukrywające dane końcowe. Po raz pierwszy, proponowane jest tworzenie tabeli substytucyjnych w oparciu o iterację automatów komórkowych,które zostają zainicjowane poprzez dane klucza.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2020, 10, 1; 8-11
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On symmetric spaces containing isomorphic copies of Orlicz sequence spaces
Autorzy:
Astashkin, Sergey
Powiązania:
https://bibliotekanauki.pl/articles/745096.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
symmetric space
Orlicz sequence space
independent functions
p-convex function
q-concave function
interpolation of operators
Opis:
Let an Orlicz function \(N\) be \((1+\varepsilon)\)-convex and \((2-\varepsilon)\)-concave at zero for some \(\varepsilon>0.\) Then the function \(1/N^{-1}(t)\), \(t\in(0,1]\), belongs to a separable symmetric space \(X\) with the Fatou property, which is an interpolation space with respect to the couple \((L_1,L_2)\), whenever \(X\) contains a strongly embedded subspace isomorphic to the Orlicz sequence space \(l_N\). On the other hand, we find necessary and sufficient conditions on such an Orlicz function \(N\) under which a sequence of mean zero independent functions equimeasurable with the function \({1}/{N^{-1}}(t)\), \(0
Źródło:
Commentationes Mathematicae; 2016, 56, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Program Maple do szyfrowania i deszyfrowania plików, zapisanych na dyskach i na nośnikach wymiennych
Maple implementation of an interactive application for cryptographic protection of files stored on hard disk and portable memory devices
Autorzy:
Kościelny, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/131985.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Wyższa Szkoła Informatyki Stosowanej Horyzont
Tematy:
funkcja biblioteczna Maple convert/base
szyfrowanie symetryczne plików
Maple convert/base built-in function symmetric file encryption
Opis:
Opisano przykład interaktywnej aplikacji typu `workhsheet` uruchamianej w środowisku Maple 2015.1 i realizującej zadania „bezkluczowego” szyfrowania i deszyfrowania plików. Aplikacja jest prosta w obsłudze, ponieważ użytkownik nie wprowadza żadnych danych tylko używa myszy. Program posiada prosty graficzny interfejs użytkownika i przeznaczony jest głównie do kryptograficznej ochrony plików przechowywanych na dyskach i na nośnikach wymiennych. Aplikacja wyjątkowo skutecznie i niezawodnie chroni pliki przed nieupoważnionym dostępem.
An example of an interactive implementation Maple worksheet application which performs the „keyless” file encryption or decryption by means of the symmetric cipher has been presented. The application has simple graphical user interface and may be used mainly for cryptographic protection of files stored in disks and in portable memory devices. The application very effectively protect files against unauthorized access.
Źródło:
Biuletyn Naukowy Wrocławskiej Wyższej Szkoły Informatyki Stosowanej. Informatyka; 2015, 5; 2-6
2082-9892
Pojawia się w:
Biuletyn Naukowy Wrocławskiej Wyższej Szkoły Informatyki Stosowanej. Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Shooting Tests of Target Perforating Ability, Performed on Cast Concrete Cylinders
Autorzy:
Habera, Łukasz
Hebda, Kamil
Koślik, Piotr
Sałaciński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1062821.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
shaped charge
axially-symmetric elliptical liner
hexogen
perforation channel
concrete
X-ray computer tomography
3D numerical visualisation
Opis:
In this paper, the first results of the applicability of shaped charges with a single liner, of a conical and of an axially-symmetric elliptical shape, are compared. The shaped charges were of an analogous type. The outer diameter and the height of the shaped charges were 39 and 42 mm, respectively. The mass of the explosive (flegmatized hexogen) in these charges was 27 g. The charges with the conical liner were commercially available. All liners used in these tests were made according to the same technology, as well as being of the same material, i.e. electrolytic copper. Two series of tests were carried out for shaped charges with the elliptical liner, i.e. 11 and 12 shots, with or without a distance plate between the shaped charge and the concrete shooting model (core), respectively. For comparison, 4 shots for each of these configurations were executed for commercial shaped charges with a conical liner. The distance plate was made of mild steel and its dimensions were 50×50×10 mm. All of the concrete cores used were uniform in the shape of a cylinder, with diameter 160 ±10 mm and height 1200 ±10 mm, and were prepared in a single-batch process. The tests were completed under outdoor conditions at ambient temperature. of 0.1 mm, were used to create 3D numerical visualisation of the perforation channels in the concrete cores created by the tested shaped charges. The 3D images allowed the depths to be measured, together with the volumes and degrees of uniformity of these channels. On the basis of these images, it was determined that the volume of the perforation channels created when using shaped charges with an elliptical liner were in the range 230-557 cm3, while the volumes created by commercial shaped charges were in the range 105-201 cm3. This is because charges with an elliptically shaped liner produced longer perforation channels than their analogues with conical liners. The tested shaped charges enclosing a single liner of an axially-symmetric elliptical shape assures better opening of a hydrocarbon reservoir in the downhole conditions of oil and gas wells, as compared to its analogous traditional form, with a conical liner.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 4; 584-599
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of medical service quality based on a novel multi-criteria decision-making method with unknown weighted information
Autorzy:
Zhao, Butian
Zhang, Runtong
Xing, Yuping
Powiązania:
https://bibliotekanauki.pl/articles/1845505.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interval-valued q-rung dual hesitant fuzzy set
Maclaurin symmetric mean operator
multi-criteria decision-making
aggregation operators
Opis:
In modern society, people concern more about the evaluation of medical service quality. Evaluation of medical service quality is helpful for medical service providers to supervise and improve their service quality. Also, it will help the public to understand the situation of different medical providers. As a multi-criteria decision-making (MCDM) problem, evaluation of medical service quality can be effectively solved by aggregation operators in interval-valued q-rung dual hesitant fuzzy (IVq-RDHF) environment. Thus, this paper proposes interval-valued q-rung dual hesitant Maclaurin symmetric mean (IVq-RDHFMSM) operator and interval-valued q-rung dual hesitant weighted Maclaurin symmetric mean (IVq-RDHFWMSM) operator. Based on the proposed IVq-RDHFWMSM operator, this paper builds a novel approach to solve the evaluation problem of medical service quality including a criteria framework for the evaluation of medical service quality and a novel MCDM method. What’s more, aiming at eliminating the discordance between decision information and weight vector of criteria determined by decisionmakers (DMs), this paper proposes the concept of cross-entropy and knowledge measure in IVq-RDHF environment to extract weight vector from DMs’ decision information. Finally, this paper presents a numerical example of the evaluation of medical service for hospitals to illustrate the availability of the novel method and compares our method with other MCDM methods to demonstrate the superiority of our method. According to the comparison result, our method has more advantages than other methods.
Źródło:
Archives of Control Sciences; 2021, 31, 3; 645-685
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Stability of an Irrigation Canal System
Autorzy:
Bounit, H.
Powiązania:
https://bibliotekanauki.pl/articles/908097.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
matematyka
Saint-Venant equation
dimensionless
symmetric hyperbolic equation
internal stability
transfer functions
input-output stability
regular systems
Opis:
In this paper we examine the stability of an irrigation canal system. The system considered is a single reach of an irrigation canal which is derived from Saint-Venant's equations. It is modelled as a system of nonlinear partial differential equations which is then linearized. The linearized system consists of hyperbolic partial differential equations. Both the control and observation operators are unbounded but admissible. From the theory of symmetric hyperbolic systems, we derive the exponential (or internal) stability of the semigroup underlying the system. Next, we compute explicitly the transfer functions of the system and we show that the input-output (or external) stability holds. Finally, we prove that the system is regular in the sense of (Weiss, 1994) and give various properties related to its transfer functions.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 4; 453-468
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Study between CS-LBP/SVM and CS-LBP/PCA in Facial Expression Recognition
Autorzy:
Gaur, Sheena
Powiązania:
https://bibliotekanauki.pl/articles/1075570.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Center symmetric local binary patterns (CS-LBP)
Facial Expression Analysis
Principal Component Analysis 9PCA)
Support Vector Machine (SVM)
Opis:
Face plays significant role in social communication. This is a 'window' to human personality, emotions and thoughts. Due to this, face is a subject of study in many areas of science such as psychology, behavioral science, medicine and computer science etc. In this paper, a comparative study is suggested between CS-LBP/SVM and CS-LBP/PCA. These algorithms are used in emotive facial expression recognition. Finally, a comparison is shown between PCA & SVM in terms of Dimension Reduction. The proposed system uses grayscale frontal face images of a Japanese female to classify six basic emotions namely happiness, sadness, disgust, fear, surprise and anger.
Źródło:
World Scientific News; 2019, 121; 83-89
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scalable PP-1 block cipher
Autorzy:
Bucholc, K.
Chmiel, K.
Grocholewska-Czuryło, A.
Idzikowska, E.
Janicka-Lipska, I.
Stokłosa, J.
Powiązania:
https://bibliotekanauki.pl/articles/907705.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
resistance against cryptanalysis
symmetric cipher
scalable cipher
S-box construction
error detection
szyfrowanie symetryczne
szyfrowanie skalowalne
kryptoanaliza
wykrywanie błędu
Opis:
A totally involutional, highly scalable PP-1 cipher is proposed, evaluated and discussed. Having very low memory requirements and using only simple and fast arithmetic operations, the cipher is aimed at platforms with limited resources, e.g., smartcards. At the core of the cipher's processing is a carefully designed S-box. The paper discusses in detail all aspects of PP-1 cipher design including S-box construction, permutation and round key scheduling. The quality of the PP-1 cipher is also evaluated with respect to linear cryptanalysis and other attacks. PP-1's concurrent error detection is also discussed. Some processing speed test results are given and compared with those of other ciphers.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 2; 401-411
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New symmetric cryptosystem
Nowy kryptosystem symetryczny
Autorzy:
Jelonek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/209751.pdf
Data publikacji:
2011
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
wzorzec biometryczny
bezpieczeństwo danych
tożsamość cyfrowa
kryptologia
podpis cyfrowy
informatyka kryminalistyczna
symmetric cryptosystem
private key
quotient module
linear algebra
Opis:
In this note we show how to use some simple algebraic concepts in symmetric cryptography. For a given number n ≥ 2 let M ⊂ Zⁿ be a free submodule of rank n of prime index [Zⁿ : M]=p. To code the information we use the algebraic structure of the quotient module Zⁿ / M. The private key is composed from the prime number p and some vectors v1,...vn ; w ∈ Zⁿ.
W tej pracy stosujemy pewne proste algebraiczne koncepcje by zbudować nowy kryptosystem symetryczny. Dla danej liczby naturalnej n ≥ 2 niech M ⊂ Zⁿ będzie podmodułem wolnym rzędu n i indeksu pierwszego [Zⁿ : M]=p. Informacje kodujemy wykorzystując algebraiczną strukturę modułu ilorazowego Zⁿ / M. Klucz prywatny składa się z liczby pierwszej p i pewnych wektorów v1,...vn ; w ∈ Zⁿ.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 3; 415-420
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect algebras and ring-like structures
Autorzy:
Beltrametti, Enrico
Maczyński, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/728948.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
generalized Boolean quasiring
effect algebra
ring-like structure
quantum logics
axiomatic quantum mechanics
state-supported probability
symmetric difference
Opis:
The dichotomic physical quantities, also called propositions, can be naturally associated to maps of the set of states into the real interval [0,1]. We show that the structure of effect algebra associated to such maps can be represented by quasiring structures, which are a generalization of Boolean rings, in such a way that the ring operation of addition can be non-associative and the ring multiplication non-distributive with respect to addition. By some natural assumption on the effect algebra, the associativity of the ring addition implies the distributivity of the lattice structure corresponding to the effect algebra. This can be interpreted as another characterization of the classicality of the logical systems of propositions, independent of the characterizations by Bell-like inequalities.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2003, 23, 1; 63-79
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On representative functions method for clustering of 2D contours with application to pottery fragments typology
Autorzy:
Kaliszewska, A.
Syga, M.
Powiązania:
https://bibliotekanauki.pl/articles/205512.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
shape representation
2D contours
cross-sections
rotationally symmetric objects
representative functions
clustering
dynamic time warping (DTW) distance
Opis:
We investigate clustering of 2D contours which represent cross-sections of rotationally symmetric objects. We propose modifications of the existing representations of digitized 2D contours and similarity measures. In particular, we represent each of the investigated objects as a single number and two functions and we use the DTW distance to measure their similarity. We apply our method to clustering of pottery fragments.
Źródło:
Control and Cybernetics; 2018, 47, 1; 85-108
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$L^p$-spaces and quantum dynamical semigroups
Autorzy:
Goldstein, Stanisław
Lindsay, J.
Powiązania:
https://bibliotekanauki.pl/articles/1342202.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
C*-algebra
symmetric embedding
von Neumann algebra
weight
$L^p$-space
Markov semigroup
positivity
KMS-symmetry
Dirichlet form
Źródło:
Banach Center Publications; 1998, 43, 1; 211-216
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some properties for \(\alpha\)-starlike functions with respect to \(k\)-symmetric points of complex order
Autorzy:
Darwish, H. E.
Lashin, A. Y.
Sowileh, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/747047.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Analytic functions
starlike functions of complex order
convex functions of complex order
\(\alpha\)-starlike
\(k\)-symmetric points
subordination
Opis:
In the present work, we introduce the subclass \(\mathcal{T}_{\gamma ,\alpha}^{k}(\varphi )\), of starlike functions with respect to \(k\)-symmetric points of complex order \(\gamma\) (\(\gamma \neq 0\)) in the open unit disc \(\vartriangle\). Some interesting subordination criteria, inclusion relations and the integral representation for functions belonging to this class are provided. The results obtained generalize some known results, and some other new results are obtained.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2017, 71, 1
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for solving a system of linear equations with a symmetric indefinite coefficient matrix
Autorzy:
Czochralska, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/748583.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Gaussian elimination, triangular and triangular-diagonal factorization of a matrix, numerically stable diagonalization of a symmetric indefinite matrix.
Opis:
The subject of this article is a numerically stable method for solving nonsingular Cramerian systems of linear equations, with a symmetric indefinite coefficient matrix. It consists in adapting the algorithm presented in [1] that can stably and effectively diagonalize any indefinite symmetric matrix. It is in fact some modification of the Gaussian symmetric elimination procedure.
Źródło:
Mathematica Applicanda; 2006, 34, 48/07
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of medical service quality based on a novel multi-criteria decision-making method with unknown weighted information
Autorzy:
Zhao, Butian
Zhang, Runtong
Xing, Yuping
Powiązania:
https://bibliotekanauki.pl/articles/1845522.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interval-valued q-rung dual hesitant fuzzy set
Maclaurin symmetric mean
operator
multi-criteria decision-making
aggregation operators
Opis:
In modern society, people concern more about the evaluation of medical service quality. Evaluation of medical service quality is helpful for medical service providers to supervise and improve their service quality. Also, it will help the public to understand the situation of different medical providers. As a multi-criteria decision-making (MCDM) problem, evaluation of medical service quality can be effectively solved by aggregation operators in interval-valued q-rung dual hesitant fuzzy (IVq-RDHF) environment. Thus, this paper proposes interval-valued q-rung dual hesitant Maclaurin symmetric mean (IVq-RDHFMSM) operator and interval-valued q-rung dual hesitant weighted Maclaurin symmetric mean (IVq-RDHFWMSM) operator. Based on the proposed IVq-RDHFWMSM operator, this paper builds a novel approach to solve the evaluation problem of medical service quality including a criteria framework for the evaluation of medical service quality and a novel MCDM method. What’s more, aiming at eliminating the discordance between decision information and weight vector of criteria determined by decisionmakers (DMs), this paper proposes the concept of cross-entropy and knowledge measure in IVq-RDHF environment to extract weight vector from DMs’ decision information. Finally, this paper presents a numerical example of the evaluation of medical service for hospitals to illustrate the availability of the novel method and compares our method with other MCDM methods to demonstrate the superiority of our method. According to the comparison result, our method has more advantages than other methods.
Źródło:
Archives of Control Sciences; 2021, 31, 3; 645-685
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-Dimensional Lifting Model For Non-Homogeneous Loads
Autorzy:
Gilad, I.
Boughanim, D.
Powiązania:
https://bibliotekanauki.pl/articles/89919.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
manual lifting
non-symmetric lifting
biomechanics modeling
posture analysis
fizjologia pracy
pozycja przy pracy
praca mięśni
modele matematyczne
podnoszenie ładunku
Opis:
A 3-dimensional model and analysis methodology is suggested for treating lifting tasks when unbalanced loads are involved. The paper describes the biomechanical equations that are coupled with the worker’s posture geometry, to address a practical problem of non-symmetric lifting. The analysis has a dominant biomechanical modeling scope, as it contains a breakdown of the internal lifting forces resulting from posture and external loads acting on the body. The load model represents the acting forces due to unbalanced lifting, which is commonly found in industrial situations. The suggested model allows the user to simulate the influence of the practical load distribution, aiding safe design of a lifting job.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 4; 511-524
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies