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Wyświetlanie 1-15 z 55
Tytuł:
Continuity of superquadratic set-valued functions
Autorzy:
Troczka-Pawelec, K.
Powiązania:
https://bibliotekanauki.pl/articles/122038.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
grupy topologiczne
przestrzeń wektorowa
topologiczna przestrzeń wektorowa
topological groups
vector space
topological vector space
Opis:
Let X = (X,+) be an arbitrary topological group. The aim of the paper is to prove a regularity theorem for set-valued superquadratic functions, that is solutions of the inclusion 2F(s) + 2F(t) ⊂ F(s + t) + F(s − t), s, t ∈ X, with values in a topological vector space.
Źródło:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2012, 17; 77-86
2450-9302
Pojawia się w:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-photorealistic rendering with the use of short segments of straight lines in a vector space of increments
Autorzy:
Borawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/206028.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
non-photorealistic rendering
vector space of increments
Opis:
In the article, a two-stagemethod of non-photorealistic rendering is presented. In the first stage, short segments of straight lines described by vectors and tangential to the object contours are generated. On this basis, a vector image is created with the use of vector space of increments. This image can be a vector representation of the object contours in the picture.
Źródło:
Control and Cybernetics; 2014, 43, 1; 161-178
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of parallel techniques for dimensionality reduction and its impact on the quality of text processing algorithms
Autorzy:
Pietroń, M.
Wielgosz, M.
Karwatowski, M.
Wiatr, K.
Powiązania:
https://bibliotekanauki.pl/articles/114190.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
singular value decomposition
vector space model
TFIDF
Opis:
The presented algorithms employ the Vector Space Model (VSM) and its enhancements such as TFIDF (Term Frequency Inverse Document Frequency) with Singular Value Decomposition (SVD). TFIDF were applied to emphasize the important features of documents and SVD was used to reduce the analysis space. Consequently, a series of experiments were conducted. They revealed important properties of the algorithms and their accuracy. The accuracy of the algorithms was estimated in terms of their ability to match the human classification of the subject. For unsupervised algorithms the entropy was used as a quality evaluation measure. The combination of VSM, TFIDF, and SVD came out to be the best performing unsupervised algorithm with entropy of 0.16.
Źródło:
Measurement Automation Monitoring; 2015, 61, 7; 352-353
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vector space of increments
Autorzy:
Borawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/206256.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
incremental arithmetic
vector space
vector calculus
standard deviation increment
variance increment
Opis:
The article discusses definitions of vector space for variance increment and standard deviation increment, as well as definition of scalar product for variance increment. This justifies using a vector calculus for variance increment and allows for emplyoing vector calculus methods for variance recalculated into variance increment. The paper also presents a practical example of combining images from sector-scan sonar based on comparison made between local increments of variance.
Źródło:
Control and Cybernetics; 2012, 41, 1; 145-170
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proof-theoretic approach to scope ambiguity in compositional vector space models
Autorzy:
Wijnholds, G. J.
Powiązania:
https://bibliotekanauki.pl/articles/103949.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
Tematy:
proof theory
scope ambiguity
compositional vector space models
bialgebra
Opis:
We investigate the extent to which compositional vector space models can be used to account for scope ambiguity in quantified sentences (of the form Every man loves some woman). Such sentences containing two quantifiers introduce two readings, a direct scope reading and an inverse scope reading. This ambiguity has been treated in a vector space model using bialgebras by Hedges and Sadrzadeh (2016) and Sadrzadeh (2016), though without an explanation of the mechanism by which the ambiguity arises. We combine a polarised focussed sequent calculus for the non-associative Lambek calculus NL, as described in Moortgat and Moot (2011), with the vector-based approach to quantifier scope ambiguity. In particular, we establish a procedure for obtaining a vector space model for quantifier scope ambiguity in a derivational way.
Źródło:
Journal of Language Modelling; 2018, 6, 2; 261-286
2299-856X
2299-8470
Pojawia się w:
Journal of Language Modelling
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformations of bimodule problems
Autorzy:
Geiß, Christof
Powiązania:
https://bibliotekanauki.pl/articles/1205483.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
bimodule problems
vector space categories
tame
wild
deformations
degenerations
Opis:
We prove that deformations of tame Krull-Schmidt bimodule problems with trivial differential are again tame. Here we understand deformations via the structure constants of the projective realizations which may be considered as elements of a suitable variety. We also present some applications to the representation theory of vector space categories which are a special case of the above bimodule problems.
Źródło:
Fundamenta Mathematicae; 1996, 150, 3; 255-264
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Character analysis on linear elementary algebra with max-plus operation
Autorzy:
Kalfin, Kalfin
Jufra, Jufra
Muhtar, Norma
Subiyanto, Subiyanto
Supian, Sudradjat
Powiązania:
https://bibliotekanauki.pl/articles/1177763.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Max-Plus Algebra
eigenvalues and eigenvectors
matrix
vector space
Opis:
This paper discusses the further characteristic that exists in max-plus algebra by comparing the characteristics that exist in ordinary linear algebra. The steps taken are to examine what happens to linear algebra, then applied to max-plus algebra with respect to the existing operations. Characteristics of matrix operations and differences that occur in linear algebra and are met in max-plus algebra with max and plus operations. However, max-plus algebra does not satisfy the vector space characteristics.
Źródło:
World Scientific News; 2018, 100; 110-123
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some remarks on mappings that preserve unit distance
Autorzy:
Billich, M.
Powiązania:
https://bibliotekanauki.pl/articles/121771.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
przestrzeń Euklidesa
przestrzeń euklidesowa
przestrzeń wektorowa
mapowanie
Euclidean space
vector space
mapping
Opis:
In the present paper we investigate some properties on isometric mappings between Euclidean spaces. In addition, non-isometric distance one preserving mappings are also considered.
Źródło:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2009, 14; 7-11
2450-9302
Pojawia się w:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convexity ranks in higher dimensions
Autorzy:
Kojman, Menachem
Powiązania:
https://bibliotekanauki.pl/articles/1205064.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
convexity
convexity number
Polish vector space
continuum hypothesis
Cantor-Bendixson degree
Opis:
A subset of a vector space is called countably convex if it is a countable union of convex sets. Classification of countably convex subsets of topological vector spaces is addressed in this paper. An ordinal-valued rank function ϱ is introduced to measure the complexity of local nonconvexity points in subsets of topological vector spaces. Then ϱ is used to give a necessary and sufficient condition for countable convexity of closed sets. Theorem. Suppose that S is a closed subset of a Polish linear space. Then S is countably convex if and only if there exists $α < ω_1$ so that ϱ(x) < α for all x ∈ S. Classification of countably convex closed subsets of Polish linear spaces follows then easily. A similar classification (by a different rank function) was previously known for closed subset of $ℝ^2$ [3]. As an application of ϱ to Banach space geometry, it is proved that for every $α < ω_1$, the unit sphere of C(ωα) with the sup-norm has rank α. Furthermore, a countable compact metric space K is determined by the rank of the unit sphere of C(K) with the natural sup-norm: Theorem. If $K_1,K_1$ are countable compact metric spaces and $S_i$ is the unit sphere in $C(K_i)$ with the sup-norm, i = 1,2, then $ϱ(S_1) = ϱ(S_2)$ if and only if $K_1$ and $K_2$ are homeomorphic. Uncountably convex closed sets are also studied in dimension n > 2 and are seen to be drastically more complicated than uncountably convex closed subsets of $ℝ^2$
Źródło:
Fundamenta Mathematicae; 2000, 164, 2; 143-163
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Document Clustering : Concepts, Metrics and Algorithms
Autorzy:
Tarczynski, T.
Powiązania:
https://bibliotekanauki.pl/articles/226231.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
document clustering
text mining
k-means
hierarchical clustersting
vector space model
Opis:
Document clustering, which is also refered to as text clustering, is a technique of unsupervised document organisation. Text clustering is used to group documents into subsets that consist of texts that are similar to each orher. These subsets are called clusters. Document clustering algorithms are widely used in web searching engines to produce results relevant to a query. An example of practical use of those techniques are Yahoo! hierarchies of documents [1]. Another application of document clustering is browsing which is defined as searching session without well specific goal. The browsing techniques heavily relies on document clustering. In this article we examine the most important concepts related to document clustering. Besides the algorithms we present comprehensive discussion about representation of documents, calculation of similarity between documents and evaluation of clusters quality.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 271-277
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the boundedness of sets in Musielak-Orlicz spaces
Autorzy:
Shragin, Isaac V.
Powiązania:
https://bibliotekanauki.pl/articles/745827.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
bounded set in topological vector space, F-norm, gen-~function, Musielak-Orlicz space, right space
Opis:
The notions of metrical and topological vector boundedness of sets are considered in Musielak-Orlicz spaces. The space is called right if both these notions are equivalent. Necessary conditions of the rightness are established, and certain sufficient conditions are found.
Źródło:
Commentationes Mathematicae; 2013, 53, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uniformly bounded set-valued composition operators in the spaces of functions of bounded variation in the sense of Schramm
Autorzy:
Ereú, T.
Merentes, N.
Sanchez, J. L.
Wróbel, M.
Powiązania:
https://bibliotekanauki.pl/articles/951870.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
funkcja ograniczona
funkcja afiniczna
Nemytskii operator
przestrzeń wektorowa
affine function
vector space
Opis:
We prove that, under some general assumptions, the one-sided regularizations of the generator of any uniformly bounded set-valued composition operator, acting in the spaces of functions of bounded variation in the sense of Schramm with nonempty bounded closed and convex values is an affine function. As a special case, we obtain an earlier result ([15]).
Źródło:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2012, 17; 37-47
2450-9302
Pojawia się w:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved space vector modulation strategy for common-mode voltage reduction in matrix rectifier
Autorzy:
Liu, X.
Zhang, Q.
Hou, D.
Powiązania:
https://bibliotekanauki.pl/articles/950664.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
matrix converter
space vector modulation
common-mode voltage
Opis:
The matrix rectifier modulated by the classical space vector modulation (SVM) strategy generates common-mode voltage (CMV). The high magnitude and high du/dt of the CMV causes serious problems such as motor damage, electromagnetic noise and many others. In this paper, an improved SVM strategy is proposed by replacing the zero vectors with suitable couple of active ones that substantially eliminate the CMV. Theoretical analysis proves that the proposed strategy can reduce the amplitude of the CMV to half of the original value. In addition, the quality of the input and output waveforms is not affected by extra active vectors. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposed strategy are shown.
Źródło:
Archives of Electrical Engineering; 2014, 63, 1; 93-106
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple three-level neutral point voltage balance control strategy based on SVPWM
Autorzy:
Bo, G.
Shanmei, Ch.
Yi, Q.
Powiązania:
https://bibliotekanauki.pl/articles/141238.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
space vector
neutral point voltage
voltage offset
PWM
Opis:
The unbalance of the neutral point voltage is an inherent problem of three-level neutral-point-clamped (NPC) inverter, the effect of neutral point voltage balancing which is caused by voltage vector is analyzed, and the relationship of the voltage offset and neutral point voltage is studied in this paper. This paper proposes a novel neutral point balance strategy for three-level NPC inverter based on space vector pulse width modulation (SVPWM). A voltage offset is added to the modulation wave, and a closed-loop neutral point voltage balance control system is designed. In the control system, the dwelling time of synthesis voltage vectors for SVPWM is varied to solve the problem of the unbalance of the neutral point voltage, the sequence of the voltage vectors maintains unchanging. Simulation and experimental results show the neutral point voltage balancing control strategy based on SVPWM is effective.
Źródło:
Archives of Electrical Engineering; 2013, 62, 1; 15-23
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The concept of boundedness and the Bohr compactification of a MAP Abelian group
Autorzy:
Galindo, Jorge
Hernández, Salvador
Powiązania:
https://bibliotekanauki.pl/articles/1205259.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Bohr topology
LCA group
$ℒ_∞$-group
boundedness
locally convex vector space
DF-space
maximally almost periodic
respects compactness
C-embedded
C*-embedded
Opis:
Let G be a maximally almost periodic (MAP) Abelian group and let ℬ be a boundedness on G in the sense of Vilenkin. We study the relations between ℬ and the Bohr topology of G for some well known groups with boundedness (G,ℬ). As an application, we prove that the Bohr topology of a topological group which is topologically isomorphic to the direct product of a locally convex space and an $ℒ_∞$-group, contains "many" discrete C-embedded subsets which are C*-embedded in their Bohr compactification. This result generalizes an analogous theorem of van Douwen for the discrete case and some other ones due to Hartman and Ryll-Nardzewski concerning the existence of $I_0$-sets. We also obtain some results on preservation of compactness for the Bohr topology of several types of MAP Abelian groups, like $ℒ_∞$-groups, locally convex vector spaces and free Abelian topological groups.
Źródło:
Fundamenta Mathematicae; 1999, 159, 3; 195-218
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 55

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