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Wyświetlanie 1-15 z 24
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:
Self-sensing teleoperation system based on 1-dof pneumatic manipulator
Autorzy:
Saków, M.
Miądlicki, K.
Parus, A.
Powiązania:
https://bibliotekanauki.pl/articles/385020.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
telerobotics
modeling
inverse problems
manipulators
Opis:
Paper presents a novel approach to a control design of bilateral teleoperation systems with force-feedback. The problem statement, analysis of research achievements to date, and the scope of the study are presented. The new design of a control unit for a master-slave system with force-feedback is presented on a simple and ideal 1-DOF bilateral teleoperation system. System control unit was based on an inverse model. The model was used to reduce value of force in the force-feedback communication channel, that the system might generate in freemotion. A substantial part of the paper is focused on the development of a mathematical model covering phenomena occurring in the investigated control scheme. The new approach was validated on a test-stand of a rotating non-linear pneumatic manipulator arm. Two linear pneumatic actuators were used in the drive system. The paper presents the modeling procedure of the experimental setup and the model used in the study. Three experiments are described to demonstrate the new control approach to master-slave objects with force-feedback. The paper contains conclusions regarding the control system and the experimental setup.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 1; 64-76
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
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:
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:
Advanced Inversion Techniques for Ground Penetrating Radar
Autorzy:
Fedeli, A.
Pastorino, M.
Randazzo, A.
Powiązania:
https://bibliotekanauki.pl/articles/308896.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
electromagnetic scattering
Ground Penetrating Radar
inverse problems
Opis:
Ground Penetrating Radar (GPR) systems arenowadays standard inspection tools in several application areas, such as subsurface prospecting, civil engineering and cultural heritage monitoring. Usually, the raw output of GPR isprovided as a B-scan, which has to be further processed inorder to extract the needed information about the inspectedscene. In this framework, inversescattering-based approachesare gaining an ever-increasing interest, thanks to their capabilities of directly providing images of the physical and dielectricproperties of the investigated areas. In this paper, some advances in the development of such inversion techniques in theGPR field are revised and discussed.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 3; 37-42
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
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:
Evolutionary multi-agent computing in inverse problems
Autorzy:
Wróbel, K.
Torba, P.
Paszyński, M
Byrski, A.
Powiązania:
https://bibliotekanauki.pl/articles/305816.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multi-agent systems
evolutionary computation
inverse problems
Opis:
This paper tackles the application of evolutionary multi-agent computing to solve inverse problems. High costs of fitness function call become a major difficulty when approaching these problems with population-based heuristics. However, evolutionary agent-based systems (EMAS) turn out to reduce the fitness function calls, which makes them a possible weapon of choice against them. This paper recalls the basics of EMAS and describes the considered problem (Step and Flash Imprint Lithography), and later, shows convincing results that EMAS is more effective than a classical evolutionary algorithm.
Źródło:
Computer Science; 2013, 14 (3); 367-383
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of selected algorithms for force identification in time domain
Porównanie wybranych algorytmów identyfikacji wymuszeń działających w dziedzinie czasu
Autorzy:
Deręgowski, J.
Mendrok, K.
Powiązania:
https://bibliotekanauki.pl/articles/329588.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
identyfikacja wymuszeń
zagadnienie odwrotne
force identification
inverse problems
Opis:
In recent years one can observe significant growth of the interest in the structural health monitoring (SHM) systems development and applications. However many authors focuses on the damage detection and all the activities related with diagnosis of failure. Meanwhile, classical, full SHM system should have in addition to a diagnostic module also module for excitation monitoring. Excitation can be measured, but easier and cheaper is to identify it by measuring the response of the object. Often it is the only practical possibility to monitor the excitation. The authors took this often overlooked problem of SHM systems, comparing the most commonly used algorithms for the identification of excitation acting in the time domain in terms of their usefulness in SHM systems. Showing a description of each of the algorithms and simulation results. The following features were compared: accuracy of the excitation reconstruction, simplicity of the algorithm, including the amount and type of data needed to build the model.
W ostatnich latach obserwuje się znaczny wzrost zainteresowania budową i zastosowaniami układów monitorowania stanu obiektów (ang. Structural Health Monitoring - SHM). Jednakże większość autorów skupia się na wykrywaniu uszkodzeń i innymi czynnościami związanymi z diagnostyką. Tymczasem, klasyczny, pełny układ monitoringu powinien posiadać poza modułem diagnostycznym również moduł odpowiedzialny za rejestrację wymuszeń. Wymuszenia te mogą być mierzone, lecz taniej i łatwiej niejednokrotnie jest identyfikować je na podstawie pomiaru odpowiedzi. Często jest to jedyna praktyczna możliwość monitorowania wymuszeń. Autorzy podjęli ten często pomijany problem, dokonując porównania najpopularniejszych algorytmów identyfikacji wymuszeń działających w dziedzinie czasu pod kątem ich przydatności w układach SHM. Pokazano zarówno opis metod jak i wyniki ich symulacyjnej weryfikacji. Porównywano następujące cechy algorytmów: dokładność odtwarzania wymuszenia, prostota algorytmu z uwzględnieniem implementacji, czasu działania i rodzaju danych koniecznych do przygotowania algorytmu.
Źródło:
Diagnostyka; 2012, 3(63); 27-34
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stretching the Least Squares to Embed Loss Function Tables
Autorzy:
Yoneda, K.
Moretti, A. C.
Poker, J. Jr.
Powiązania:
https://bibliotekanauki.pl/articles/375983.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
least squares
individual behavior
inverse problems
simultaneous equations
optimization
Opis:
The method of least squares is extended to accommodate a class of loss functions specified in the form of function tables. The function tables are embedded into the standard quadratic loss function so that nonlinear least squares algorithms can be adopted for loss minimization. This is an alternative to a more straightforward approach which interpolates the function tables and minimizes the resulting loss function by some generic optimization algorithm. The alternative approach has advantages over the straightforward, such as the wider availability of the least squares programs compared to the generic optimization programs and reduction in computational complexity. Examples are given for its application to multiplicative utility function maximization problems.
Źródło:
Decision Making in Manufacturing and Services; 2015, 9, 2; 105-116
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of polygonal domains using PIES in inverse boundary problems modeled by 2D Laplaces equation
Autorzy:
Zieniuk, E.
Bołtuć, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964153.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska
Tematy:
parametric integral equation system (PIES)
inverse problems
Laplace's equation
Opis:
The paper presents an original method to identify polygonal boundary geometry in 2D boundary problems defined by Laplace's equation using a parametric integral equation system (PIES). In the PIES, the polygonal boundary shape is defined mathematically by means of parametric linear segments, with a small number of corner points being posed. Identification of the polygonal boundary is reduced to identification of the corner points. Finally, the solution of the problem is reduced to the solution of a non-linear system of algebraic equations. Coordinates of identified corner points are obtained after solving the system of equations.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 4; 415-426
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Cast Iron Substitute Thermal Capacity Using the Experimental Data
Autorzy:
Majchrzak, E.
Mendakiewicz, J.
Mochnacki, B.
Powiązania:
https://bibliotekanauki.pl/articles/353685.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modeling of alloys solidification
numerical methods
sensitivity analysis
inverse problems
Opis:
In the paper the problem of the cast iron substitute thermal capacity estimation is discussed. This parameter appears when the macroscopic mathematical model of alloys solidification bases on the one domain method (fixed domain approach). In the case of cast iron the form of function describing the course of temperature-dependent thermal capacity is quite complex. Using the experimental data, in particular the measured cooling, heating curves at the set of points selected in the casting – mould domain the identification problem has been solved using the gradient methods. The results presented concern the gray iron 3.21% C and 1.9% Si.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 307-314
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the inverse problems of Lyapunov theorem and Riccati equation
Autorzy:
Sun, Y.
Powiązania:
https://bibliotekanauki.pl/articles/205963.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
teoria systemu liniowego
zagadnienie odwrotne
inverse problems
linear systems theory
Opis:
In this note, the inverse problem of Lyapunov theorem is reconsidered and the inverse problem of Riccati equation is introduced. Simple proofs are provided to guarantee the solution of such problems.
Źródło:
Control and Cybernetics; 2001, 30, 2; 227-230
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of the boundary condition in the problem of the binary alloy solidification
Odtworzenie warunku brzegowego w zagadnieniu krzepnięcia stopu dwuskładnikowego
Autorzy:
Słota, D.
Powiązania:
https://bibliotekanauki.pl/articles/351110.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
krzepnięcie
zagadnienie odwrotne
stop dwuskładnikowy
solidification
inverse problems
binary alloys
macrosegregation
Opis:
The solution of the inverse problem involving the designation of the boundary condition in the problem of the binary alloy solidification for known temperature measurements at a selected point of the cast is presented. In the discussed model, the temperature distribution is described by means of the Stefan problem with varying in time temperature corresponding to the beginning of solidification and depending on the concentration of the alloy component. Whereas to describe the concentration, the Scheil model was used.
W pracy przedstawiono rozwiązanie zagadnienia odwrotnego polegającego na określeniu warunku brzegowego w zagadnieniu krzepnięcia stopu dwuskładnikowego, gdy znane są pomiary temperatury w wybranym punkcie odlewu. W rozważanym modelu rozkład temperatury opisany został zagadnieniem Stefana ze zmienną w czasie temperaturą odpowiadającą początkowi procesu krzepnięcia, zależną od stężenia składnika stopowego. Do opisu stężenia wykorzystano model Scheila.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 2; 278-285
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 24

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