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Wyświetlanie 1-15 z 115
Tytuł:
Synthesis of Binary Group-Complementary Sequences
Autorzy:
Koshevyy, V.M.
Powiązania:
https://bibliotekanauki.pl/articles/116221.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ultra wideband (UWB)
binary sequences
binary group-complementary sequences
complementary sequences
reduction of the number sequences
set of sequences
synthetized sequences
radar signals
Opis:
Algorithm of binary {-1, 1} group-complementary sequences direct construction for any sequences length N is suggested. On the base of these sequences the signals with very wide frequency bandwidth may be constructed (up to the ultra wideband (UWB) signals). Synthesized sequences may found their application in radar and communication.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 545-548
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A search of significant phrases for building topic models in text documents
Autorzy:
Ożdżyński, P.
Zakrzewska, D.
Powiązania:
https://bibliotekanauki.pl/articles/94925.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
topic model
frequent sequences
LDA
Opis:
A huge amount of documents in the digitalized libraries requires efficient methods for exploring contained there information. ìTopic modelingî is considered as one of the most effective among them. In spite of commonly used approaches for finding occurrences of single words, in the paper building topic models based on phrases is pondered. We propose a methodology, which enables to create a set of significant word sequences and thus limiting the search area to phrases which contain them. The methodology is evaluated on experiments performed on real text datasets. Obtained results are compared with those received by using LDA algorithm.
Źródło:
Information Systems in Management; 2016, 5, 2; 205-214
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Walsh-chirp sequences for wireless applications
Autorzy:
Wysocki, B. J.
Wysocki, T. A.
Zepernick, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/309560.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
spread spectrum communications
polyphase spreading sequences
multi-access interference
Walsh sequences
aperiodic correlation functions
Opis:
This paper deals with a new method to design polyphase spreading sequences for DS CDMA wireless applications. The method is based on weighting symbols of the orthogonal Walsh sequences by the complex factors being symbols of baseband chirp sequences. The resulting sequences possess good aperiodic correlation properties, while maintaining the orthogonality. Because of the parametric design, the sequences can be optimized to achieve desired characteristics.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 3; 24-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphical tools of discrete longitudinal data presentation in R
Autorzy:
Genge, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/425116.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
longitudinal data
categorical sequences
sequence visualization
Opis:
Good graphical presentation of data is useful during the whole analysis process from the first glimpse into the data to the model fitting and presentation of results. The most popular way of longitudinal data presentation are separate (for each wave, in cross-sectional dimension) comparisons of figures. However, plotting the data over time is useful in suggesting appropriate modeling techniques to deal with the heterogeneity observed in the trajectories. The main aim of this paper is to present the changing perceptions of the financial situation in Poland using different graphical tools for the heterogonous discrete longitudinal data sets and present demographics features for those changes. We will focus on the most important features of the categorical longitudinal data – category sequences and their graphical presentation. We aim to characterize the analyzed sequences on the basis of unidimensional indicators and composite complexity measures, as well as using mainly TraMineR [Gabadinho et al. 2017] package of R.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2019, 23, 3; 26-39
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrability of trigonometric series with generalized semi-convex coefficients
Autorzy:
Krasniqi, X. Z.
Powiązania:
https://bibliotekanauki.pl/articles/254833.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
trigonometric series
generalized semi-convex sequences
Opis:
In this paper we deal with cosine and sine trigonometric series with generalized semi-convex coefficients. Integrability conditions for them are obtained.
Źródło:
Opuscula Mathematica; 2012, 32, 3; 521-528
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extremum degree sets of irregular oriented graphs and pseudodigraphs
Autorzy:
Dziechcińska-Halamoda, Zyta
Majcher, Zofia
Michael, Jerzy
Skupień, Zdzisław
Powiązania:
https://bibliotekanauki.pl/articles/743975.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
irregular digraphs
degree sequences
degree sets
Opis:
A digraph in which any two vertices have distinct degree pairs is called irregular. Sets of degree pairs for all irregular oriented graphs (also loopless digraphs and pseudodigraphs) with minimum and maximum size are determined. Moreover, a method of constructing corresponding irregular realizations of those sets is given.
Źródło:
Discussiones Mathematicae Graph Theory; 2006, 26, 2; 317-333
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing of thermographic sequence using Principal Component Analysis
Autorzy:
Świta, R.
Suszyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/114604.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
filtering
correlation
PCA
segmentation
thermal sequences
Opis:
This paper describes application of the principal component analysis in relation to the thermal imaging contrast sequences, recorded with pulse excitation for three different objects. The aim of the study was to demonstrate that thermographic sequences contain an excessive number of data-distorting information about the characteristics of an object and that it is possible to reduce them. It has been shown that PCA can improve SNR, simplifies separation of areas with distinct features and allows determining their count, which is important, inter alia, with infrared image segmentation. The study shows examples of the results for a sequence of infrared registered for thin-layer-chromatography plate (SiO2 on glass) with separated analytes, the high power Si-eutectic-Mo thyristor structure with defects in eutectic, and the Al disk with cavities of different diameter and depth.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 215-218
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extremes in multivariate stationary normal sequences
Autorzy:
Wiśniewski, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/1339017.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
stationary normal sequences
extreme order statistics
Opis:
This paper deals with a weak convergence of maximum vectors built on the base of stationary and normal sequences of relatively strongly dependent random vectors. The discussion concentrates on the normality of limits and extends some results of McCormick and Mittal [4] to the multivariate case.
Źródło:
Applicationes Mathematicae; 1998-1999, 25, 3; 375-379
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrability of Double Cosine Trigonometric Series with coefficients of bounded variation of second order
Autorzy:
Krasniqi, Xhevat Z.
Powiązania:
https://bibliotekanauki.pl/articles/744869.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Trigonometric series
sequences of bounded variation
Opis:
In this paper integrability condition for double cosine trigonometric series with coefficients of bounded variation of second order has been obtained. This condition is given explicitly in terms of the coefficients. The result extends a previous result of Telyakovskiı̆ from one dimensional case to two dimensional case.
Źródło:
Commentationes Mathematicae; 2011, 51, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the inverse of two variables power series
Autorzy:
Ptak, M.
Rutkowska, A.
Sowa, A.
Powiązania:
https://bibliotekanauki.pl/articles/748705.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Multiple sequences and serie
Convergence and divergence of series and sequences
Extrapolation to the limit, deferred corrections
Opis:
.
We show a new recurrent formula for coefficients of an inverse of a power series of two variables with partially vanishing coefficient
Źródło:
Mathematica Applicanda; 1995, 24, 38
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on the general moment problem
Autorzy:
El Azhar, Hamza
Hanine, Abdelouahab
Zerouali, El Hassan
Powiązania:
https://bibliotekanauki.pl/articles/29519750.pdf
Data publikacji:
2024
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
general moment problem
charge sequences
atomic measure
Opis:
In this note we show that given an indeterminate Hamburger moment sequence, it is possible to perturb the first moment in such way that the obtained sequence remains an indeterminate Hamburger moment sequence. As a consequence we prove that every sequence of real numbers is a moment sequence for a signed discrete measure supported in $ \mathbb{R}_+ $.
Źródło:
Opuscula Mathematica; 2024, 44, 3; 359-372
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using frequent pattern mining algorithms in text analysis
Autorzy:
Ożdżyński, P.
Zakrzewska, D.
Powiązania:
https://bibliotekanauki.pl/articles/95011.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
GSP
SuffixArray
PrefixSpan
N-Gram
frequent sequences
Opis:
In text mining, effectiveness of methods depends on document representations. The ones based on frequent word sequences are used in such tasks as categorization, clustering and topic modelling. In the paper a comparison of different algorithms for finding frequent word sequences is presented. There are considered techniques dedicated for market basket analysis such as GSP and PrefixSpan as well as a method based on a suffix array. The investigated techniques are compared with the new approach of searching maximum frequent word sequences in document sets. Performance of the algorithms is examined taking into account execution times for the considered test collections.
Źródło:
Information Systems in Management; 2017, 6, 3; 213-222
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Chaplyghin method for first order partial differential equations
Autorzy:
Puźniakowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/255777.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
characteristics
Newton method
Chaplyghin sequences
initial problems
Opis:
Classical solutions of initial problems for nonlinear first order partial differential equations are considered. It is shown that under natural assumptions on given functions, there exist Chaplyghin sequences and they are convergent. Error estimates for approximate solutions are given. The method of characteristics is used for the construction of approximate solutions.
Źródło:
Opuscula Mathematica; 2008, 28, 2; 163-178
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formulaic Sequences in First Language Acquisition and Foreign Language Learning
Autorzy:
Orlik, Marta
Powiązania:
https://bibliotekanauki.pl/articles/601311.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
formulaic sequences, formulas, fused strings, prefabricated chunks
Opis:
Formulaic sequences constitute a large part of the language we speak. This group contains, for example, idiomatic expressions, proverbs, mnemonics, or larger texts taught as a whole, like songs or prayers. They seem to be stored in our mental lexicon rather than created from scratch every time they are needed. The aim of the present article is to examine some types of formulaic sequences and discuss their function in communication. First, the article describes how children acquire and make use of formulaic sequences when they start speaking English as their mother tongue. Secondly, the paper discusses the difference between learning English as an L1 and as an L2. The paper aims to discuss various strategies used by children who do not speak English but have to use it because they find themselves in English-speaking environments. Furthermore, the article discusses some selected issues concerning adults learning formulaic sequences and major problems connected with it. Such difficulties usually stem from not having enough linguistic input from native speakers and therefore not being able to recognise strings of words that are most likely to occur. 
Źródło:
New Horizons in English Studies; 2017, 2
2543-8980
Pojawia się w:
New Horizons in English Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formelhaft oder nicht? Die wichtigsten Merkmale der formelhaften Sequenzen
Formulaic or not? The most important characteristics of formulaic sequences
Autorzy:
Czarnecka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/917007.pdf
Data publikacji:
2018-11-05
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
formulaic sequences
formulaicity
language economics
whole memorization
Opis:
Formulaic sequences constitute a large protection of any discourse and, furthermore, they exist in so many forms that it is difficult to develop an adequate definition of this phenomenon. The term formulaic sequences encompasses verious types of world strings which appear to be stored and retrieved as holistic units from the memory. This article outlines some improtant aspects of formulaic sequences; it also shows the variety of definitions which appear in the research literature, and tries to find some specific criteria by means of which formulaic sequences could be identified in a discourse or a text.
Źródło:
Glottodidactica. An International Journal of Applied Linguistics; 2010, 36, 1; 33-43
0072-4769
Pojawia się w:
Glottodidactica. An International Journal of Applied Linguistics
Dostawca treści:
Biblioteka Nauki
Artykuł
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