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Wyświetlanie 1-15 z 476
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:
The grouping differential evolution algorithm for multi-dimensional optimization problems
Autorzy:
Piotrowski, A. P.
Napiórkowski, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/969839.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
differential evolution
multidimensional problems
multimodal problems
metaheuristics
Opis:
A variant of the Differential Evolution method is presented. The classical Differential Evolution approach is very successful for simple problems, but does not perform well enough for troublesome multi-dimensional non-convex continuous functions. To overcome some of the drawbacks, the Grouped Multi-Strategy Differential Evolution algorithm is proposed here. The main idea behind the new approach is to exploit the knowledge about the local minima already found in different parts of the search space in order to facilitate further search for the global one. In the proposed method, the population is split into four groups: three of them rarely communicate with the others, but one is allowed to gain all available knowledge from the whole population throughout the search process. The individuals simultaneously use three different crossover/mutation strategies, which makes the algorithm more flexible. The proposed approach was compared with two Differential Evolution based algorithms on a set of 10- to 100-dimensional test functions of varying difficulty. The proposed method achieved very encouraging results; its advantage was especially significant when more difficult 50- and 100-dimensional problems were considered. When dividing population into separate groups, the total number of individuals becomes a crucial restriction. Hence, the impact of the number of individuals on the performance of the algorithms was studied. It was shown that increasing the number of individuals above the number initially proposed for classic Differential Evolution method is in most cases not advantageous and sometimes may even result in deterioration of results.
Źródło:
Control and Cybernetics; 2010, 39, 2; 527-550
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation of the eigenvalue problem for elliptic operator by finite element method with numerical integration
Autorzy:
Lewińska, E.
Powiązania:
https://bibliotekanauki.pl/articles/748226.pdf
Data publikacji:
1994
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Eigenvalue problems
Opis:
.
The author considers the effect of numerical integration in the case of solving a two-dimensional eigenvalue problem for the second-order elliptic differential operator via the finite element method. It is proved that the optimal estimates for eigenfunctions (namely, the estimates of the same order as the optimal estimates for the classical finite element approximation without numerical integration) are valid under the assumption that the precision of the numerical quadrature is the same as that for the corresponding boundary value problem.
Źródło:
Mathematica Applicanda; 1994, 23, 37
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A principal for safe vehicle traffic in a section of a road on which passing is prohibited
Autorzy:
Dziuda, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/747966.pdf
Data publikacji:
1982
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Traffic problems
Opis:
.
The paper deals with the determination of the safe distance between vehicles in a section of a road, on which passing is prohibited. Nonzero length of each vehicle is assumed. First the minimal safe distance is evaluated in the case when two vehicles, P 1 followed by P 2 , have equal speeds and suddenly P 1 starts to brake. In the rest of the paper the case of forced speed reduction of the faster vehicle P 2 is considered. The main result of this section is the formula for the least safe distance between P 1 and P 2 on which P 2 is obliged to apply the brake. This distance ensures the safety during the whole time interval when the speed of P 2 exceeds that of P 1 including the situation of unexpected applying of the brake by the vehicle P 1 .
Źródło:
Mathematica Applicanda; 1982, 10, 18
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
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:
Approximation of eigenvalues of nonselfadjoint problems on an infinite interval
Autorzy:
Regińska, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/748435.pdf
Data publikacji:
1979
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Linear boundary value problems,Linear equations,Eigenvalue problems
Opis:
W pracy badane są zagadnienia własne Lu=a u. Dowodzi się, iż wartości własne tego zagadnienia są aproksymowane przez wartości własne pewnych zagadnień własnych na przedziałach skończonych.
The author treats the problem of approximation of the eigenvalues of the nonselfadjoint problem Lu=λu, u(0)=0, u∈L2(0,∞), where L=−d2/dt2+p(x), domL={u∈L2(0,∞):du/dt continuous, d2u/dt2∈L2(0,∞), u(0)=0}. The same question for a selfadjoint problem was answered in the author's recent paper.
Źródło:
Mathematica Applicanda; 1979, 7, 14
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extensions of the control variational method
Autorzy:
Sprekels, J.
Tiba, D.
Powiązania:
https://bibliotekanauki.pl/articles/206097.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
calculus of variations
contact problems
evolution problems
Opis:
The control variational method is a development of the variational approach, based on optimal control theory. In this work, we give an application to a variational inequality arising in mechanics and involving unilateral conditions both in the domain and on the boundary, and we explore the extension of the method to time-dependent problems.
Źródło:
Control and Cybernetics; 2011, 40, 4; 1099-1108
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control for a nonstationary linear system with a quadratic cost functional
Autorzy:
Czornik, Adam
Powiązania:
https://bibliotekanauki.pl/articles/747535.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Optimal stochastic control
Problems involving randomness
Linear-quadratic problems
Opis:
.
This paper is about optimal control of infinite-horizon nonstationary stochastic linear processes with a quadratic cost criterion. The synthesis problem of optimal control is solved under the assumptions that the criterion is an average expected cost and that the process' matrices possess limits for the time approaching infinity. Furthermore, the limit matrices are such that the "limit" process is both observable and controllable. The paper documents existence of an optimal feedback control policy. The policy is such that the gain matrix is a (scaled) solution to a Riccati stationary matrix equation. The equation is stationary in that its coefficients are the limits of the process' non-stationary matrices.
Źródło:
Mathematica Applicanda; 1997, 26, 40
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
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:
Extrema problems solved in GeoGebra
Extremální úlohy řešené v programu GeoGebra
Autorzy:
Morávková, Z.
Volný, P.
Powiązania:
https://bibliotekanauki.pl/articles/113399.pdf
Data publikacji:
2017
Wydawca:
STE GROUP
Tematy:
GeoGebra
extrema problems
Opis:
The solving of applied problems is a reasonable way to gain better understanding of mathematical concepts, especially for future engineers. GeoGebra is a very useful tool for modeling these problems thanks to its interactivity.
Rešení aplikovaných úloh je jeden z vhodných zpusobu pro lepší pochopení matematických konceptu predevším pro budoucí inženýry. Díky své interaktivite je GeoGebra velmi užitecný nástroj pro modelování takových úloh.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2017, 6, 4; 294-299
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vision problems in children - a review
Autorzy:
Kourkouta, L.
Frantzana, E.
Iliadis, Ch.
Ouzounakis, P.
Monios, A.
Powiązania:
https://bibliotekanauki.pl/articles/1918528.pdf
Data publikacji:
2017-11-12
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
vision problems
children
Opis:
Introduction: A vision problem is a condition which involves not only visual difficulty but also blindness. Purpose: The purpose of this short review study is the early recognition of vision problems in children, the proper treatment as well as their prevention. Materials and methods: The material of the study has been recent articles on the subject that have been found mainly in the electronic database Medline, (HEAL-Link), with the following keywords: children, vision impairment, blindness, treatment, prevention. Review: A high risk group of individuals that frequently presents ophthalmic severe lesions leading to blindness consists of children with prenatal and perinatal adverse effects. Conclusions: Education gives the opportunity of co-existence between the blind and people who are able to see. This is the path to social inclusion of individuals with vision problems. Moreover, it is estimated these two groups would have more points in common than differences between them through this experience.
Źródło:
Progress in Health Sciences; 2017, 7(2); 80-84
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multigrid method for numerical solution of ordinary differential equations
Autorzy:
Kozakiewicz, J. M.
Mika, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/747463.pdf
Data publikacji:
1992
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Initial value problems
Opis:
.
We consider the initial value problem for systems of ordinary differential equations such that the solution vector can be split into subvectors and each subvector represented as a product of a scalar amplitude and a shape vector which changes slowly with time. The equations for the shape vectors can be solved with much larger time steps than those required for the original equations. The numerical results show that a substantial reduction in the computing time may be achieved
Źródło:
Mathematica Applicanda; 1992, 21, 35
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The algorithms of selected methods for the two-point boundary value problem for the equation - u + g(x)u = f(x)
Autorzy:
Kołodziejczyk, Janusz
Grabarski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/747914.pdf
Data publikacji:
1990
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Boundary value problems
Opis:
.
In this paper four algorithms of methods of approximate solution of the two-point boundary value problem for the equation - u” + g(x)u = f(x) are given and compared. The finite difference, collocation, finite element and collocation-Galerkin methods are considered. Numerical results are presented. For sufficiently regular functions u,f and g the finite difference method is the most effective.
Źródło:
Mathematica Applicanda; 1990, 18, 32
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges to American Hegemony: Realizing and Responding
Autorzy:
Nguyen, Hang
Powiązania:
https://bibliotekanauki.pl/articles/531283.pdf
Data publikacji:
2016-03-15
Wydawca:
Fundacja Instytut Nauki o Polityce
Tematy:
American hegemony
domestic problems
psychologic problems
emerging powers
power diffusion
Opis:
This article analyzes the challenges to American hegemony in the contemporary world order. It will demonstrate that the rise of the rest including China and India, the possibilities of a massive military attack and an economic collapse on American soil are merely exaggerated challenges to American hegemonic position. The challenges that have great potential to cut into American hegemony are very internal including American domestic and psychologic problems. Looking at the future of American hegemony, the article highlights that the United States still has overwhelming power to sustain its hegemony in the foreseeable time. Yet it is crucially important for American leaders to realize and effectively deal with the imminent challenges to its power. Also, six policy recommendations are made for the United States to endure its hegemony in the contemporary world order.
Źródło:
Polish Journal of Political Science; 2016, 2, 1; 63-91
2391-3991
Pojawia się w:
Polish Journal of Political Science
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
Wyświetlanie 1-15 z 476

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