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Wyszukujesz frazę "problems" wg kryterium: Temat


Tytuł:
Elevator trip distribution for inconsistent passenger input-output data
Autorzy:
Yoneda, K.
Powiązania:
https://bibliotekanauki.pl/articles/375933.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
traffic problems
inverse problems
estimation
operation research
Opis:
Accurate traffic data are the basis for group control of elevators and its performance evaluation by trace driven simulation. The present practice estimates a time series of inter-floor passenger traffic based on commonly available elevator sensor data. The method demands that the sensor data be transformed into sets of passenger input-output data which are consistent in the sense that the transportation preserves the number of passengers. Since observation involves various behavioral assumptions, which may actually be violated, as well as measurement errors, it has been necessary to apply data adjustment procedures to secure the consistency. This paper proposes an alternative algorithm which reconstructs elevator passenger origin-destination tables from inconsistent passenger input-output data sets, thus eliminating the ad hoc data adjustment.
Źródło:
Decision Making in Manufacturing and Services; 2007, 1, 1-2; 175-190
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving boundary value problems in the open source software R: package bvpSolve
Autorzy:
Mazzia, F.
Cash, J. R.
Soetaert, K.
Powiązania:
https://bibliotekanauki.pl/articles/255850.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ordinary differential equations
boundary value problems
singular perturbation problems
test problems
Fortran
R
Opis:
The R package bvpSolve for the numerical solution of Boundary Value Problems (BVPs) is presented. This package is free software which is distributed under the GNU General Public License, as part of the R open source software project. It includes some well known codes to solve boundary value problems of ordinary differential equations (ODEs) and differential algebraic equations (DAEs). In addition to the packages already available for solving initial value problems, the new package now allows non expert users to efficiently solve boundary value problems in the problem solving environment R.
Źródło:
Opuscula Mathematica; 2014, 34, 2; 387-403
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety technical problems associated with the storage of liquefied natural gas (LNG)
Autorzy:
Oliinyk, A.
Łaciak, M.
Powiązania:
https://bibliotekanauki.pl/articles/298850.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
LNG
storage problems
Opis:
Liquefied natural gas (LNG) due to its extremely favorable properties is considered to be one of the most convenient sources of energy, both the transport, storage and distribution. However, these same properties, and factors which represent the LNG as convenient, such as: a very low temperature (-162 degrees of Celsius), a very large increase in the volume of the evaporation (about 600 times) and also create a potential threats The greatest potential threats are in areas where LNG is a very large quantities for a long period of time. The facts presented above show that there is potentially the greatest threat to the storage of LNG. Leaks, clouds LNG vapor, explosions, low temperature, and "rollover" are the most dangerous potential hazards that occur during storage of LNG. Each of these risks can be avoided. This is achieved by the use of appropriate materials for tanks and equipment, as well as the proper and adequate execution of engineering design at each stage of technology. Proper selection of vessel design and materials, and the use of appropriate methods of combining them decide on a safe and long life tanks.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 1; 181-189
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collocation methods for the solution of eigenvalue problems for singular ordinary differential equations
Autorzy:
Auzinger, W.
Karner, E.
Koch, O.
Weinmuller, E.
Powiązania:
https://bibliotekanauki.pl/articles/255635.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
polynomial collocation
singular boundary value problems
linear and nonlinear eigenvalue problems
Opis:
We demonstrate that eigenvalue problems for ordinary differential equations can be recast in a formulation suitable for the solution by polynomial collocation. It is shown that the well-posedness of the two formulations is equivalent in the regular as well as in the singular case. Thus, a collocation code equipped with asymptotically correct error estimation and adaptive mesh selection can be successfully applied to compute the eigenvalues and eigenfunctions efficiently and with reliable control of the accuracy. Numerical examples illustrate this claim.
Źródło:
Opuscula Mathematica; 2006, 26, 2; 229-241
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Threats to the environment in the areas of abandoned extraction of hydrocarbon deposits
Autorzy:
Rybicki, Cz.
Winid, B.
Solecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/299032.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
abandoned wells
environmental problems
Opis:
The environmental problems in past mining areas, where the production process was ended, are connected with contaminations coming from past extraction processes and the risks relating to the abandonment of wells and deposits. The risk could be variable depending on such factors as the geological formation and hydrogeological conditions in the analyzed area, and the condition of abandoned wells. The main source of contamination could be improperly sealed abandoned wells and unplugged abandoned oil and gas wells. The environmental problems could be particularly concern on the area of old historical extraction sites. There are some hydrocarbon deposits, where production i s endedand still it is possible to see places of wells and remains of an old oilfield infrastructure. Unplugged or improperly sealed wells can result in stray gas migration or contamination of soil, ground and surface and ground waters. The end of well exploitation may cause the risk associated to the restoration of formation pressure. This could be the reason of uncontrolled discharge of gaseous and liquid hydrocarbons into shallow depths. Returning to the extraction from some deposits could reduce the formation pressure and constrain uncontrollable leakages of hydrocarbons. This option seems to be environmentally friendly. Authors of the paper made efforts to evaluate the scale and the range of mentioned disadvantageous phenomena.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 1; 103-120
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear Sturm-Liouville problems with Riemann- Stieltjes integral boundary conditions
Autorzy:
Kong, Q.
George, T. E. S.
Powiązania:
https://bibliotekanauki.pl/articles/254797.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
nodal solutions
integral boundary value problems
Sturm-Liouville problems
eigenvalues
matching method
Opis:
We study second-order linear Sturm-Liouville problems involving general homogeneous linear Riemann-Stieltjes integral boundary conditions. Conditions are obtained for the existence of a sequence of positive eigenvalues with consecutive zero counts of the eigenfunctions. Additionally, we find interlacing relationships between the eigenvalues of such Sturm-Liouville problems and those of Sturm-Liouville problems with certain two-point separated boundary conditions.
Źródło:
Opuscula Mathematica; 2018, 38, 4; 557-571
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Misfit landforms imposed by ill-conditioned inverse parametric problems
Autorzy:
Łoś, M.
Smołka, M.
Schaefer, R.
Sawicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/305739.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
taxonomy of ill-conditioned problems
ill-posed global optimization problems
fitness landscapes
Opis:
In this paper, we put forward a new topological taxonomy that allows us to distinguish and separate multiple solutions to ill-conditioned parametric inverse problems appearing in engineering, geophysics, medicine, etc. This taxonomy distinguishes the areas of insensitivity to parameters called the landforms of the misfit landscape, be it around minima (lowlands), maxima (uplands), or stationary points (shelves). We have proven their important separability and completeness conditions. In particular, lowlands, uplands, and shelves are pairwise disjoint, and there are no other subsets of the positive measure in the admissible domain on which the misfit function takes a constant value. The topological taxonomy is related to the second, “local” one, which characterizes the types of ill-conditioning of the particular solutions. We hope that the proposed results will be helpful for a better and more precise formulation of ill-conditioned inverse problems and for selecting and profiling complex optimization strategies used in solving these problems.
Źródło:
Computer Science; 2018, 19 (2); 157-178
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On reconstructing an unknown coordinate of a nonlinear system of differential equations
Autorzy:
Blizorukowa, M.
Kuklin, A.
Maksimov, V
Powiązania:
https://bibliotekanauki.pl/articles/256042.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ordinary differential equations
inverse problems
Opis:
The paper discusses a method of auxiliary controlled models and the application of this method to solving problems of dynamical reconstruction of an unknown coordinate in a nonlinear system of differential equations. The solving algorithm, which is stable with respect to informational noises and computational errors, is presented.
Źródło:
Opuscula Mathematica; 2014, 34, 2; 257-269
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of ODE limit problems for reaction-diffusion equations
Autorzy:
Simsen, J.
Simsen, M. S.
Zimmermann, A.
Powiązania:
https://bibliotekanauki.pl/articles/1397881.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ODE limit problems
shadow systems
reaction-diffusion equations
parabolic problems
variable exponents
attractors
upper semicontinuity
Opis:
In this work we study ODE limit problems for reaction-diffusion equations for large diffusion and we study the sensitivity of nonlinear ODEs with respect to initial conditions and exponent parameters. Moreover, we prove continuity of the flow and weak upper semicontinuity of a family of global attractors for reaction-diffusion equations with spatially variable exponents when the exponents go to 2 in $L^\infty(\Omega)$ and the diffusion coefficients go to infinity.
Źródło:
Opuscula Mathematica; 2018, 38, 1; 117-131
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on confidence intervals for deblurred images
Autorzy:
Biel, Michał
Szkutnik, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/255867.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
inverse problems
confidence intervals
convolution
deblurring
Opis:
We consider pointwise asymptotic confidence intervals for images that are blurred and observed in additive white noise. This amounts to solving a stochastic inverse problem with a convolution operator. Under suitably modified assumptions, we fill some apparent gaps in the proofs published in [N. Bissantz, M. Birke, Asymptotic normality and confidence intervals for inverse regression models with convolution-type operators, J. Multivariate Anal. 100 (2009), 2364-2375]. In particular, this leads to modified bootstrap confidence intervals with much better finite-sample behaviour than the original ones, the validity of which is, in our opinion, questionable. Some simulation results that support our claims and illustrate the behaviour of the confidence intervals are also presented.
Źródło:
Opuscula Mathematica; 2020, 40, 3; 361-373
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Utility Function to Solve Approximate Linear Equations for Decision Making
Autorzy:
Yoneda, K.
Celaschi, W.
Powiązania:
https://bibliotekanauki.pl/articles/375878.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
individual behavior
inverse problems
simultaneous equations
optimization
Opis:
Suppose there are a number of decision variables linearly related to a set of outcome variables. There are at least as many outcome variables as the number of decision variables since all decisions are outcomes by themselves. The quality of outcome is evaluated by a utility function. Given desired values for all outcome variables, decision making reduces to “solving” the system of linear equations with respect to the decision variables; the solution being defined as decision variable values such that maximize the utility function. This paper proposes a family of additively separable utility functions which can be defined by setting four intuitive parameters for each outcome variable: the desired value of the outcome, the lower and the upper limits of its admissible interval, and its importance weight. The utility function takes a nonnegative value within the admissible domain and negative outside; permits gradient methods for maximization; is designed to have a small dynamic range for numerical computation. Small examples are presented to illustrate the proposed method.
Źródło:
Decision Making in Manufacturing and Services; 2013, 7, 1-2; 5-18
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A loss function for box-constrained inverses problems
Autorzy:
Yoneda, K.
Powiązania:
https://bibliotekanauki.pl/articles/375902.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
individual behavior
inverse problems
simultaneous equations
optimization
Opis:
A loss function is proposed for solving box-constrained inverse problems. Given causality mechanisms between inputs and outputs as smooth functions, an inverse problem demands to adjust the input levels to make the output levels as close as possible to the target values; box-constrained refers to the requirement that all outcome levels remain within their respective permissible intervals. A feasible solution is assumed known, which is often the status quo. We propose a loss function which avoids activation of the constraints. A practical advantage of this approach over the usual weighted least squares is that permissible outcome intervals are required in place of target importance weights, facilitating data acquisition. The proposed loss function is smooth and strictly convex with closed-form gradient and Hessian, permitting Newton family algorithms. The author has not been able to locate in the literature the Gibbs distribution corresponding to the loss function. The loss function is closely related to the generalized matching law in psychology.
Źródło:
Decision Making in Manufacturing and Services; 2008, 2, 1-2; 79-98
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maximization of an Asymmetric Utility Function by the Least Squares
Autorzy:
Yoneda, K.
Moretti, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/375999.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
individual behavior
inverse problems
simultaneous equations
optimization
Opis:
This note points out that a utility maximization procedure proposed in an earlier paper may be reduced to the least squares. The utility function is asymmetric in the sense that for each cue its ideal value and the permissible range are assigned in such a way that the ideal is not necessarily at the center of the range, like "a beer of 350 ml would be ideal, but acceptable if within [100, 500]". A practical consequence of the observation is that very little programming will be needed to deploy the utility maximization since software for the least squares is widely available.
Źródło:
Decision Making in Manufacturing and Services; 2014, 8, 1-2; 5-12
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
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:
Existence results and a priori estimates for solutions of quasilinear problems with gradient terms
Autorzy:
Filippucci, Roberta
Lini, Chiara
Powiązania:
https://bibliotekanauki.pl/articles/255859.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
existence result
quasilinear problems
a priori estimates
Opis:
In this paper we establish a priori estimates and then an existence theorem of positive solutions for a Dirichlet problem on a bounded smooth domain in [formula] with a nonlinearity involving gradient terms. The existence result is proved with no use of a Liouviiie theorem for the limit problem obtained via the usual blow up method, in particular we refer to the modified version by Ruiz. In particular our existence theorem extends a result by Lorca and Ubilla in two directions, namely by considering a nonlinearity which includes in the gradient term a power of u and by removing the growth condition for the nonlinearity ∫ at u = 0.
Źródło:
Opuscula Mathematica; 2019, 39, 2; 195-205
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł

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