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Wyświetlanie 1-10 z 36
Tytuł:
Semi-Browder operators and perturbations
Autorzy:
Rakočević, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/1220263.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
ascent
descent
semi-Fredholm
Opis:
An operator in a Banach space is called upper (resp. lower) semi-Browder if it is upper (lower) semi-Fredholm and has a finite ascent (resp. descent). An operator in a Banach space is called semi-Browder if it is upper semi-Browder or lower semi-Browder. We prove the stability of the semi-Browder operators under commuting Riesz operator perturbations. As a corollary we get some results of Grabiner [6], Kaashoek and Lay [8], Lay [11], Rakočević [15] and Schechter [16].
Źródło:
Studia Mathematica; 1997, 122, 2; 131-137
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
La cathédrale gothique et la crypte: de l’ascension à la descente
Autorzy:
Jakubczyk, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2076893.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Gothic Cathedral
Crypt
Ascension
Descent
Symbolism
Opis:
The article deals with the symbolism of the Gothic cathedral and crypt in Wyspiański’s “French” letters to Rydel, Huysmans’ and Berent’s novels, and in the art from the late 19th century through the early 20th century (Monet, Rodin). The cathedral represented in the examined works becomes a symbol of the need of the human soul to free oneself from the body and fly up to heaven. The crypt is considered a space of self-reflection and refuge.
Źródło:
Kwartalnik Neofilologiczny; 2016, 4; 523-533
0023-5911
Pojawia się w:
Kwartalnik Neofilologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The buffered optimization methods for online transfer function identification employed on DEAP actuator
Autorzy:
Bernat, Jakub
Kołota, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/27322621.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Stochastic Gradient Descent
ADAM
AMSGrad
DEAP
system identification
Opis:
Identification plays an important role in relation to control objects and processes as it enables the control system to be properly tuned. The identification methods described in this paper use the Stochastic Gradient Descent algorithms, which have so far been successfully presented in machine learning. The article presents the results of the Adam and AMSGrad algorithms for online estimation of the Dielectric Electroactive Polymer actuator (DEAP) parameters. This work also aims to validate the learning by batch methodology, which allows to obtain faster convergence and more reliable parameter estimation. This approach is innovative in the field of identification of control systems. The researchwas supplemented with the analysis of the variable amplitude of the input signal. The dynamics of the DEAP parameter convergence depending on the normalization process was presented. Our research has shown how to effectively identify parameters with the use of innovative optimization methods. The results presented graphically confirm that this approach can be successfully applied in the field of control systems.
Źródło:
Archives of Control Sciences; 2023, 33, 3; 565--587
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convergence Analysis of Inverse Iterative Neural Networks with L₂ Penalty
Autorzy:
Wen, Y.
Wang, J.
Huang, B.
Zurada, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/108754.pdf
Data publikacji:
2016
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
neural networks
gradient descent
inverse iterative
monotonicity
regularization
convergence
Opis:
The iterative inversion of neural networks has been used in solving problems of adaptive control due to its good performance of information processing. In this paper an iterative inversion neural network with L₂ penalty term has been presented trained by using the classical gradient descent method. We mainly focus on the theoretical analysis of this proposed algorithm such as monotonicity of error function, boundedness of input sequences and weak (strong) convergence behavior. For bounded property of inputs, we rigorously proved that the feasible solutions of input are restricted in a measurable field. The weak convergence means that the gradient of error function with respect to input tends to zero as the iterations go to infinity while the strong convergence stands for the iterative sequence of input vectors convergence to a fixed optimal point.
Źródło:
Journal of Applied Computer Science Methods; 2016, 8 No. 2; 85-98
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“The way up is the way down”: Curzio Malaparte’s “Il Cristo Proibito” and Krzysztof Kieślowski’s “Three Colours: Red”
Autorzy:
Coates, Paul
Powiązania:
https://bibliotekanauki.pl/articles/923218.pdf
Data publikacji:
2019-03-25
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
doubling
judgment
fraternité
Christianity
revenge
descent into Hell
Opis:
The statement ‘the way up is the way down’ may imply that the spiritual way to perfection lies through humility. It may however also apply to the physical world that is the source of such spiritual metaphors, and within which the actions play out of fictional characters who themselves serve as metaphors for real ones. I will argue that both meanings apply to both of these films, with a comparison between the two films enabling one to employ Malaparte’s explicit prohibition of a Christ-like position to make apparent a similar prohibition that is only implicit in Kieślowski’s film. Such physical movements provide an appropriate topography for the concern with judgment, knowledge, revenge, isolation and humiliation embodied in the male protagonists of the two films. In each case, the protagonists’ eventual divestment from programmes of judgment and revenge may be related to the prohibition Malaparte formulates explicitly: that upon human re-enactment of the Christ-like position that is the one of judgment. Here a destructive and self-destructive movement downwards, in the sense of dehumanization and extreme isolation, is countered eventually by a downward one that, in fact, leads upwards through an embrace of the humiliation of inaction. The paper examines various ways in which the object of both texts is to rediscover a ‘we’ that is rather one of solidarity than complicity.
Źródło:
Images. The International Journal of European Film, Performing Arts and Audiovisual Communication; 2018, 24, 33; 47-59
1731-450X
Pojawia się w:
Images. The International Journal of European Film, Performing Arts and Audiovisual Communication
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of helicopter descent velocity changes on the phenomenon of vortex ring state
Autorzy:
Grzegorczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/102235.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
helicopter
Vortex Ring State (VRS)
vertical descent
numerical analysis
CFD
Opis:
The paper presents the results of a numerical aerodynamic analysis whose purpose was to determine the influence of the rate of descent on the vortex ring state (VRS). This phenomenon occurs for an appropriate combination of induced velocity and the velocity of the incoming airstream from the bottom. The rates of change of velocities delimit dangerous areas of flight. The simulations were performed using FLUENT software and the geometry of helicopter W-3 „Sokół”.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 17; 35-41
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the effect of the descent rate of a helicopter in the Vortex Ring conditions
Autorzy:
Surmacz, K.
Kowaleczko, G.
Powiązania:
https://bibliotekanauki.pl/articles/248016.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Vortex Ring State
helicopter descent
computational fluid dynamics
flow simulations
Opis:
One of the limiting factors for a helicopter operation is the Vortex Ring State (VRS). This aerodynamic phenomenon, known as the VRS or “Settling with Power”, is characterized by the formation of circulating air stream moving along a ring shaped track around the main rotor of a helicopter. Conditions, conducive to development of the vortex ring state, occur in the vertical or nearly vertical descent. This leads to decrease in thrust and thus rapidly increasing the rate of descent. This phenomenon occurs for an appropriate combination of induced velocity and the velocity of the stream of airflow from the bottom to the rotor. The rates of change of velocities delimit dangerous areas of flight. The objective of this work was to investigate the influence of the descent rate of a helicopter on the vortex ring formation process and determinants of the occurrence of vortex rings. For better understanding of the nature of this state, a computational method was applied. Series of three-dimensional (3D) unsteady analysis was carried out using Computational Fluid Dynamics tools (CFD). Simulations were realized using geometry and performance of the W-3 “Sokol” helicopter. The paper presents results of a helicopter operation in axial and non-axial descent conditions. Three calculation cases of vertical flight of a helicopter with different rates of velocity changes were considered. A simulation of non-axial descent was based on the measured flight test data for the W-3 helicopter. The results provide information about the changing nature of the flow in the course of the movement of a helicopter and show the influence of the rate of descent during initiation on the development of VRS. Results of the calculations provide guidelines for helicopter pilots.
Źródło:
Journal of KONES; 2016, 23, 1; 345-352
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the axiomatic theory of spectrum II
Autorzy:
Mbekhta, M.
Müller, V.
Powiązania:
https://bibliotekanauki.pl/articles/1287569.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
spectral mapping theorem
ascent
descent
semiregular operators
quasi-Fredholm operators
Opis:
We give a survey of results concerning various classes of bounded linear operators in a Banach space defined by means of kernels and ranges. We show that many of these classes define a spectrum that satisfies the spectral mapping property.
Źródło:
Studia Mathematica; 1996, 119, 2; 129-147
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximate relaxed descent method for optimal control problems
Autorzy:
Chryssoverghi, I.
Coletsos, J.
Kokkinis, B.
Powiązania:
https://bibliotekanauki.pl/articles/206679.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
dyskretyzacja
kontrola relaksacyjna
sterowanie optymalne
descent method
discretization
optimal control
relaxed controls
Opis:
We consider an optimal control problem for systems governed by ordinary differential equations with control constraints. Since no convexity assumptions are made on the data, the problem is reformulated in relaxed form. The relaxed state equation is discretized by the implicit trapezoidal scheme and the relaxed controls are approximated by piecewise constant relaxed controls. We then propose a combined descent and discretization method that generates sequences of discrete relaxed controls and progressively refines the discretization. Since here the adjoint of the discrete state equation is not defined, we use, at each iteration, an approximate derivative of the cost functional defined by discretizing the continuous adjoint equation and the integral involved by appropriate trapezoidal schemes. It is proved that accumulation points of sequences constructed by this method satisfy the strong relaxed necessary conditions for optimality for the continuous problem. Finally, the computed relaxed controls can be easily approximated by piecewise constant classical controls.
Źródło:
Control and Cybernetics; 2001, 30, 4; 385-404
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 36

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