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Wyszukujesz frazę "dilation" wg kryterium: Temat


Tytuł:
Dilation and Modelling of Sands in the Light of Experimental Data
Autorzy:
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/241366.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
sands
dilation
constitutive equations
Opis:
The problem of dilation is discussed in the context of classical Cam-Clay model, which was developed on the basis of a specific assumption regarding the plastic work. This assumption leads to a special form of the dilation function, from which a shape of yield function is derived. The above mentioned assumption is compared with the results of the triaxial tests, performed on the model “Skarpa” sand. It is shown that the Cam-Clay approach is not realistic, as it is based on the assumption which is not consistent with experimental data. Some general considerations and discussion of this problem are also presented.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 1-2; 3-15
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Payload Enhancement on Least Significant Bit Image Steganography Using Edge Area Dilation
Autorzy:
Setiadi, De Rosal Ignatius Moses
Powiązania:
https://bibliotekanauki.pl/articles/226376.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
edge
dilation
image
payload
steganography
Opis:
This research proposes a method to enhance the payload message by embedding messages on the dilated edge areas by the Least Significant Bit (LSB) method. To add security aspects to messages, messages are not embedded directly on the LSB but encrypted with XOR operations with Most Significant Bit (MSB). The experimental results of the test in this study showed that the dilation process to some extent can increase the payload of 18.65% and the average bpp is 1.42 while maintaining the imperceptibilty quality of stego image with an average PSNR value of about 47 dB, SSIM is 0.9977 and MSE is 1.13.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 287-292
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On dilation and commuting liftings of $n$-tuples of commuting Hilbert space contractions
Autorzy:
Burdak, Zbigniew
Grygierzec, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/1795588.pdf
Data publikacji:
2020-04-01
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
dilation
lifting
von Neumann inequality
Opis:
The $n$-tuples of commuting Hilbert space contractions are considered. We give a model of a commuting lifting of one contraction and investigate conditions under which a commuting lifting theorem holds for an $n$-tuple. A series of such liftings leads to an isometric dilation of the $n$-tuple. The method is tested on some class of triples motivated by Parrotts example. It provides also a new proof of the fact that a positive definite $n$-tuple has an isometric dilation.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2020, 19; 121-139
2300-133X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast watershed-based dilation
Autorzy:
Smołka, J.
Powiązania:
https://bibliotekanauki.pl/articles/103212.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
image processing
dilation
watershed transformation
Opis:
A watershed-based region growing image segmentation algorithm requires a fast watershed-based dilation implementation for effective operation. This paper presents a new way for watershed image representation and uses this representation for effective implementation of dilation. Methods for improving the algorithm speed are discussed. Presented solutions may also be used for solving other problems where fast set summation is required.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 23; 41-44
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Optimization Algorithm for Dilation and Erosion
Autorzy:
Yin, K.
Powiązania:
https://bibliotekanauki.pl/articles/108794.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
dilation
erosion
optimization
iteration algorithm
time complexity analysis
Opis:
Effectively optimizing dilation and erosion is an extensively studied but not completely resolved problem. In this paper, a new optimization algorithm is proposed to improve the efficiency of dilation and erosion. Four notions are given to define the edges for any simply connected structuring element (SE). An assistant algorithm is proposed to detect these edges. Based on these notions, three iteration equations can be derived, which redefine dilation and erosion as iteration calculation. Time complexity of the new algorithm is reduced to O(n³). In addition, the new algorithm is suitable for online applications without the decomposition of SE. Simulation shows that with the same parameters, the performance of the new algorithm is better than that of Yang's algorithm.
Źródło:
Journal of Applied Computer Science Methods; 2011, 3 No. 1; 5-16
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the existence of a compactly supported $L^{p}$-solution for two-dimensional two-scale dilation equations
Autorzy:
Kotowicz, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1339206.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
dilation equation
compactly supported $L^p$ scaling function
Opis:
Necessary and sufficient conditions for the existence of compactly supported $L^p$-solutions for the two-dimensional two-scale dilation equations are given.
Źródło:
Applicationes Mathematicae; 1996-1997, 24, 3; 325-334
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factorization through Hilbert space and the dilation of L(X,Y)-valued measures
Autorzy:
Mandrekar, V.
P., P.
Powiązania:
https://bibliotekanauki.pl/articles/1292450.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
spectral dilation of operator-valued measure
Hilbertian operators
factorization
Opis:
We present a general necessary and sufficient algebraic condition for the spectral dilation of a finitely additive L(X,Y)-valued measure of finite semivariation when X and Y are Banach spaces. Using our condition we derive the main results of Rosenberg, Makagon and Salehi, and Miamee without the assumption that X and/or Y are Hilbert spaces. In addition we relate the dilation problem to the problem of factoring a family of operators through a single Hilbert space.
Źródło:
Studia Mathematica; 1993, 107, 2; 101-113
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilation theorems for completely positive maps and map-valued measures
Autorzy:
Hensz-Chądzyńska, Ewa
Jajte, Ryszard
Paszkiewicz, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1342207.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
completely positive map
von Neumann algebra
dilation
map-valued measure
Opis:
The Stinespring theorem is reformulated in terms of conditional expectations in a von Neumann algebra. A generalisation for map-valued measures is obtained.
Źródło:
Banach Center Publications; 1998, 43, 1; 231-239
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the intertwinings of regular dilations
Autorzy:
Gaşpar, Dumitru
Suciu, Nicolae
Powiązania:
https://bibliotekanauki.pl/articles/1294790.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
commuting multioperator
*-regular dilation
contractive intertwining
(semi-)subnormal pair
Opis:
The aim of this paper is to find conditions that assure the existence of the commutant lifting theorem for commuting pairs of contractions (briefly, bicontractions) having (*-)regular dilations. It is known that in such generality, a commutant lifting theorem fails to be true. A positive answer is given for contractive intertwinings which doubly intertwine one of the components. We also show that it is possible to drop the doubly intertwining property for one of the components in some special cases, for instance for semi-subnormal bicontractions. As an application, a result regarding the existence of a unitary (isometric) dilation for three commuting contractions is obtained.
Źródło:
Annales Polonici Mathematici; 1997, 66, 1; 105-121
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endoscopic treatment of oesophageal injury after thyroidectomy – a case report
Autorzy:
Radziuk, Dagmara
Witzling, Mieczysław
Powiązania:
https://bibliotekanauki.pl/articles/1392110.pdf
Data publikacji:
2019
Wydawca:
Index Copernicus International
Tematy:
cervical oesophageal perforation
oesophageal injury
oesophagogastroscopy
oesophagus dilation
thyroidectomy
Opis:
The most common complications after thyroidectomy are postoperative neck hematoma, recurrent laryngeal nerve injury and hypoparathyroidism [1]. However, iatrogenic cervical esophageal perforation is a very rare repercussion of this procedure. In literature there are a few reported cases concerning this complication. We want to report a case of a patient with severe esophageal injury resulting from thyroidectomy.
Źródło:
Polish Journal of Surgery; 2019, 91, 6; 50-52
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On operators with unitary ϱ-dilations
Autorzy:
Ando, T.
Takahashi, K.
Powiązania:
https://bibliotekanauki.pl/articles/1294732.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
polynomially bounded operators
operators of class $C_ϱ$
unitary ϱ-dilation
Opis:
We show a polynomially boundend operator T is similar to a unitary operator if there is a singular unitary operator W and an injection X such that XT = WX. If, in addition, T is of class $C_ϱ$, then T itself is unitary.
Źródło:
Annales Polonici Mathematici; 1997, 66, 1; 11-14
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive definite functions and dual pairs of locally convex spaces
Autorzy:
Alpay, D.
Gabriyelyan, S.
Powiązania:
https://bibliotekanauki.pl/articles/255413.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
positive definite function locally convex space
dual pair
factorization property
dilation theory
Opis:
Using pairs of locally convex topological vector spaces in duality and topologies defined by directed families of sets bounded with respect to the duality, we prove general factorization theorems and general dilation theorems for operator-valued positive definite functions.
Źródło:
Opuscula Mathematica; 2018, 38, 4; 463-482
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Embedding complete ternary trees into hypercubes
Autorzy:
Choudum, S.
Lavanya, S.
Powiązania:
https://bibliotekanauki.pl/articles/743075.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
complete ternary trees
hypercube
interconnection network
embedding
dilation
node congestion
edge congestion
Opis:
We inductively describe an embedding of a complete ternary tree Tₕ of height h into a hypercube Q of dimension at most ⎡(1.6)h⎤+1 with load 1, dilation 2, node congestion 2 and edge congestion 2. This is an improvement over the known embedding of Tₕ into Q. And it is very close to a conjectured embedding of Havel [3] which states that there exists an embedding of Tₕ into its optimal hypercube with load 1 and dilation 2. The optimal hypercube has dimension ⎡(log₂3)h⎤ ( = ⎡(1.585)h⎤) or ⎡(log₂3)h⎤+1.
Źródło:
Discussiones Mathematicae Graph Theory; 2008, 28, 3; 463-476
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of two variables Toeplitz type operators
Autorzy:
Król-Klimkowska, Elżbieta
Ptak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/744673.pdf
Data publikacji:
2016-12-01
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
Pair of contractions
isometric dilation
doubly commuting
Toeplitz operator
symbol operator
Opis:
The investigation of properties of generalized Toeplitz operators with respect to the pairs of doubly commuting contractions (the abstract analogue of classical two variable Toeplitz operators) is proceeded. We especially concentrate on the condition of existence such a non-zero operator. There are also presented conditions of analyticity of such an operator.
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:
Assessment of High Frequency Imaging and Doppler System for the Measurements of the Radial Artery Flow-Mediated Dilation
Autorzy:
Nowicki, Andrzej
Gambin, Barbara
Secomski, Wojciech
Trawiński, Zbigniew
Szubielski, Michał
Tymkiewicz, Ryszard
Olszewski, Robert
Powiązania:
https://bibliotekanauki.pl/articles/176847.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
flow mediated dilation
shear rate
axial resolution
elevation resolution
pulsed Doppler
ultrasonic imaging
Opis:
Objectives: In the article we describe the new, high frequency, 20 MHz scanning/Doppler probe designed to measure the flow mediated dilation (FMD) and shear rate (SR) close to the radial artery wall. Methods: We compare two US scanning systems, standard vascular modality working below 12 MHz and high frequency 20 MHz system designed for FMD and SR measurements. Axial resolutions of both systems were compared by imaging of two closely spaced food plastic foils immersed in water and by measuring systolic/diastolic diameter changes in the radial artery. The sensitivities of Doppler modalities were also determined. The diagnostic potential of a high frequency system in measurements of FMD and SR was studied in vivo, in two groups of subjects, 12 healthy volunteers and 14 patients with stable coronary artery disease (CAD). Results: Over three times better axial resolution was demonstrated for a high frequency system. Also, the sensitivity of the external single transducer 20 MHz pulse Doppler proved to be over 20 dB better (in terms of a signal-to-noise ratio) than the pulse Doppler incorporated into the linear array. Statistically significant differences in FMD and FMD/SR values for healthy volunteers and CAD patients were confirmed, p-values < 0:05. The areas under Receiver Operating Characteristic (ROC) curves for FMD and FMD/SR for the prediction CAD had the values of 0.99 and 0.97, respectively. Conclusions: These results justify the usefulness of the designed high-frequency scanning system to determine the FMD and SR in the radial artery as predictors of coronary arterial disease.
Źródło:
Archives of Acoustics; 2019, 44, 4; 637-644
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł

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