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Wyświetlanie 1-15 z 20
Tytuł:
Topology analysis and parameter design of three-level multi-input DC/DC converter based on multi-source access
Autorzy:
Tian, Jingjing
Qu, Jiaoping
Zhao, Feng
Chen, Xiaoqiang
Wang, Ying
Gan, Yang
Powiązania:
https://bibliotekanauki.pl/articles/2202547.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-input converter
parameter design
power sharing
three-level
topology analysis
Opis:
A three-level multi-input DC/DC converter is proposed to solve the problems of complex interface circuit structure and high economic cost for multi-source access to the joint power supply distribution system. In this structure, multiple dc sources are integrated into a three-level DC/DC converter. In comparison with the two-stage counterpart, two active switches and boost diodes are eliminated, while two blocking diodes are added to block the reverse current from the dc-link capacitors. In addition, when the input inductors work in the discontinuous conduction mode, power sharing among different input sources can be achieved by properly selecting the inductance value. The working principle of the converter is analyzed by introducing nine working modes in detail and deriving the steady-state relationship expressions. The parameter range of the element is determined and the design process of a group of dynamic parameter values is shown. Finally, the power electronics real-time simulation platform is built based on StarSim HIL and the corresponding experimental waveforms are given to verify the topology and analysis.
Źródło:
Archives of Electrical Engineering; 2023, 72, 1; 59--80
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of BIM to propose alternative construction methods to reduce the cost of energy for the historic archeological building in Iraq
Autorzy:
Abdullah, Oday Hammody
Hatem, Wadhah Amer
Powiązania:
https://bibliotekanauki.pl/articles/27312125.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
autodesk
chmura 360°
modelowanie informacji o budynku
BIM
projekt budowlany
efektywność energetyczna
budynek zabytkowy
projektowanie zrównoważone
parametr projektowy
insight 360 cloud
building information modelling
construction project
energy efficiency
historic building
sustainable design
design parameter
Opis:
The building information modeling (BIM) method is one of the newest methods that has been widely used in many parts of the building business, including energy management. The aim of this research is to analyze the most holy theotokos in order to find the best set of modifications that result in an optimal energy cost. The analysis was conducted through the use of building information modeling (BIM) technology and the associated programmers such as Auto Desk Revit 2020 and Auto Desk Insight 360, in order to determine the optimal strategies by which the most applicable alternative construction materials and procedures are considered in order to obtain an environmentally and economically sustainable most holy theotokos. Applying this analyze to the most holy theotokos revealed that many alternatives are capable of making a tangible reduction in the cost of electrical energy consumption and the cost of fuel for generators. Such reductions are noticed when altering in the optimum manner. The alteration of construction materials for walls and roofs also reduces the cost of electrical energy consumption and fuel for generators. The results show that changing the plug load efficiency in the optimal manner reduces the cost of electrical energy consumption by approximately 933913 US dollar ($), and changing the heating, ventilating, and air conditioning systems (HVAC) reduces the cost of fuel energy consumption by approximately 13522 US Dollar ($). Green building studio (GBS) is a tool that helps in the early stages of a project to find the best ways to save energy.
Źródło:
Archives of Civil Engineering; 2023, 69, 2; 535--549
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-independent stochastic design sensitivity analysis of structural systems with second-order accuracy
Autorzy:
Weber, H.
Powiązania:
https://bibliotekanauki.pl/articles/281017.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
design sensitivity
statics
random parameter
finite element
Opis:
In the paper, the static sensitivity of complex structures with respect to random design parameters is presented. Using the adjoint system method, based on the mean-point second-order perturbation method, the first two probabilistic moments of time-independent sensitivity are formulated with means and cross-covariances of random design parameters as the input data. It enables one to obtain the second-order accuracy of the solution. The presented formulations are illustrated by a number of numerical examples. The influence of finite element mesh density for the obtained results is discussed using the analysis of the spatial bar dome.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 783-794
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust parameter design using the weighted metric method - The case of 'the smaller the better'
Autorzy:
Ardakani, M. K.
Noorossana, R.
Niaki, S. T. A.
Lahijanian, H.
Powiązania:
https://bibliotekanauki.pl/articles/907855.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wnioskowanie decyzyjne
estymacja regresji
metodologia oceny powierzchni
metoda metryczna
multiobjective decision making
regression estimation
response surface methodology
robust parameter design
weighted metric method
Opis:
In process robustness studies, it is desirable to minimize the influence of noise factors on the system and simultaneously determine the levels of controllable factors optimizing the overall response or outcome. In the cases when a random effects model is applicable and a fixed effects model is assumed instead, an increase in the variance of the coefficient vector should be expected. In this paper, the impacts of this assumption on the results of the experiment in the context of robust parameter design are investigated. Furthermore, two criteria are considered to determine the optimum settings for the control factors. In order to better understand the proposed method and to evaluate its performances, a numerical example for the case of 'the smaller the better' is included.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 1; 59-68
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocenivanie vlijanija konstruktivno-komponovochnykh skhem ehnergosredstv na komplektovanie agregatov na ikh baze
Evaluation of the influence of structural-layout circuits power unit on acquisition of units in their base
Autorzy:
Skkarivskijj, G.
Powiązania:
https://bibliotekanauki.pl/articles/77760.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
energy parameter
tractor unit
acquisition
evaluation
design-layout scheme
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using a Parameter Diagram as a DoE Planning Tool
Autorzy:
Barsalou, Matthew
Wilcynska, Karolina
Saraiva, Pedro Manue
Powiązania:
https://bibliotekanauki.pl/articles/27324204.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
design of experiments
parameter-diagram
p-diagram
DoE
experiment planning
Opis:
This paper describes the p-diagram (parameter-diagram) and its application in planning a DoE (Design of Experiments). A case study describing an actual problem from industry is presented where the planning phase started to go wrong as difficulties in selecting the right variables for the DoE were discovered. Furthermore, running these experiments became prohibitively expensive, due to the large number of such experiments that would be needed, and though the exploitation of a p-diagram it was then possible to come up with a feasible DoE.
Źródło:
Management and Production Engineering Review; 2023, 14, 4; 3--9
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody statystyczne stosowane do wyznaczania parametrów geotechnicznych
Statistical methods used for determining geotechnical parameters
Autorzy:
Olek, B.
Woźniak, H.
Stanisz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2074248.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
projektowanie geotechniczne
parametr charakterystyczny
analiza bayesowska
geotechnical design
characteristic parameter
Bayesian updating
Opis:
The paper presents the methods of determining values of characteristic parameter. Geotechnical design is based largely on decision making under uncertainty. Currently, the biggest problem is the correct choice a save value of the parameter. In many cases, the EC7 does not specify strict form of calculation, but indicates what criteria should be checked computationally. The selection of characteristic value of geotechnical parameter is the most accurate when the statistical methods are used. This approach has proved successful in the European practice, and has been implemented for a unified standard. The choice of the appropriate method of calculation depends on many factors such as the amount of test data, statistical knowledge of the parameter or additional data from the previous research. After analyzing the available methods for estimating the value of the characteristic parameters it can be stated that the correct prediction will depend on the particular situation.
Źródło:
Przegląd Geologiczny; 2014, 62, 10/2; 657--663
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody statystyczne stosowane do wyznaczania parametrów geotechnicznych
Statistical methods used for determining geotechnical parameters
Autorzy:
Olek, B.
Woźniak, H.
Stanisz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2074258.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
projektowanie geotechniczne
parametr charakterystyczny
analiza bayesowska
geotechnical design
characteristic parameter
bayesian update
Opis:
The paper presents the methods of determining values of characteristic parameter. Geotechnical design is based largely on decision making under uncertainty. Currently, the biggest problem is the correct choice a save value of the parameter. In many cases, the EC7 does not specify strict form of calculation, but indicates what criteria should be checked computationally. The selection of characteristic value of geotechnical parameter is the most accurate when the statistical methods are used. This approach has proved successful in the European practice, and has been implemented for a unified standard. The choice of the appropriate method of calculation depends on many factors such as the amount of test data, statistical knowledge of the parameter or additional data from the previous research. After analyzing the available methods for estimating the value of the characteristic parameters it can be stated that the correct prediction will depend on the particular situation.
Źródło:
Przegląd Geologiczny; 2014, 62, 10/2; 657--663
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Selection of Measurement Locations for Parameter Estimation in Distributed Processes
Autorzy:
Uciński, D.
Powiązania:
https://bibliotekanauki.pl/articles/911191.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
czujnik lokacyjny
rozproszony system komputerowy
estymacja parametryczna
sensor location
distributed-parameter systems
parameter estimation
optimum experimental design
spatial statistics
Opis:
The problem of locating pointwise sensor measurements so as to optimally estimate unknown parameters in a class of distributed systems is studied. Based on a scalar measure of performance defined on the corresponding Fisher information matrix, two approaches are developed for this problem: introduction of continuous designs, which allows for adaptation of well-known sequential algorithms of classical optimum experimental design, and application of standard non-linear programming techniques. In each case, particular algorithms are delineated and analysis of the appropriate sensor placements is made. The relative advantages and shortcomings of both the approaches are discussed and demonstrated by applying them to a two-dimensional diffusion process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 2; 357-379
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Dispersion of Electrical Parameters and Characteristics of FinFET Devices
Autorzy:
Malinowski, A.
Tomaszewski, D.
Łukasiak, L.
Jakubowski, A.
Sekine, M.
Hori, M.
Korwin-Pawlowski, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/308253.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
FinFET
line edge roughness
parameter variability
plasma etching
technology computer aided design (TCAD)
Opis:
Extensive numerical simulations of FinFET structures have been carried out using commercial TCAD tools. A series of plasma etching steps has been simulated for different process conditions in order to evaluate the influence of plasma pressure, composition and powering on the FinFET topography. Next, the most important geometric parameters of the FinFETs have been varied and the electrical characteristics have been calculated in order to evaluate the sensitivity of the FinFET electrical parameters on possible FinFET structure variability.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 45-50
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed scheduling of measurements in a sensor network for parameter estimation of spatio-temporal systems
Autorzy:
Patan, M.
Kowalów, D.
Powiązania:
https://bibliotekanauki.pl/articles/331122.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sensor network
distributed parameter system
parameter estimation
experimental design
sensor scheduling
sieć sensorowa
układ o parametrach rozłożonych
estymacja parametrów
projekt eksperymentalny
Opis:
The main aim of the paper is to develop a distributed algorithm for optimal node activation in a sensor network whose measurements are used for parameter estimation of the underlying distributed parameter system. Given a fixed partition of the observation horizon into a finite number of consecutive intervals, the problem under consideration is to optimize the percentage of the total number of observations spent at given sensor nodes in such a way as to maximize the accuracy of system parameter estimates. To achieve this, the determinant of the Fisher information matrix related to the covariance matrix of the parameter estimates is used as the qualitative design criterion (the so-called D-optimality). The proposed approach converts the measurement scheduling problem to a convex optimization one, in which the sensor locations are given a priori and the aim is to determine the associated weights, which quantify the contributions of individual gaged sites to the total measurement plan. Then, adopting a pairwise communication scheme, a fully distributed procedure for calculating the percentage of observations spent at given sensor locations is developed, which is a major novelty here. Another significant contribution of this work consists in derivation of necessary and sufficient conditions for the optimality of solutions. As a result, a simple and effective computational scheme is obtained which can be implemented without resorting to sophisticated numerical software. The delineated approach is illustrated by simulation examples of a sensor network design for a two-dimensional convective diffusion process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 39-54
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planning identification experiments for cell signaling pathways: An NFκB case study
Autorzy:
Fujarewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/908137.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
komórka
ścieżka sygnalizacyjna
projektowanie eksperymentu
estymacja parametrów
cell signaling pathways
experiment design
parameter estimation
Opis:
Mathematical modeling of cell signaling pathways has become a very important and challenging problem in recent years. The importance comes from possible applications of obtained models. It may help us to understand phenomena appearing in single cells and cell populations on a molecular level. Furthermore, it may help us with the discovery of new drug therapies. Mathematical models of cell signaling pathways take different forms. The most popular way of mathematical modeling is to use a set of nonlinear ordinary differential equations (ODEs). It is very difficult to obtain a proper model. There are many hypotheses about the structure of the model (sets of variables and phenomena) that should be verified. The next step, fitting the parameters of the model, is also very complicated because of the nature of measurements. The blotting technique usually gives only semi-quantitative observations, which are very noisy and collected only at a limited number of time moments. The accuracy of parameter estimation may be significantly improved by a proper experiment design. Recently, we have proposed a gradient-based algorithm for the optimization of a sampling schedule. In this paper we use the algorithm in order to optimize a sampling schedule for the identification of the mathematical model of the NF[...]B regulatory module, known from the literature. We propose a two-stage optimization approach: a gradient-based procedure to find all stationary points and then pair-wise replacement for finding optimal numbers of replicates of measurements. Convergence properties of the presented algorithm are examined.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 773-780
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametry konstrukcyjne zestawów kołowych oraz ich wpływ na bezpieczeństwo jazdy
Autorzy:
Sobaś, Marek
Powiązania:
https://bibliotekanauki.pl/articles/34112071.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
Tematy:
parametry konstrukcyjne
parametr qR
zestaw kołowy
bezpieczeństwo jazdy
design parameters
qR parameter
wheelset
driving safety
Opis:
W artykule przedstawiono stan normalizacyjny zestawów kołowych, które należą do najbardziej obciążonych części w kolejnictwie. Omówiono znaczenie parametru qR, biorąc pod uwagę jego wpływ jak bezpieczeństwo jazdy, konieczność napraw oraz konserwacji. Przedstawiono dopuszczalne wymiary kresowe parametru z uwagi na bezpieczeństwo eksploatacyjne, które są zdefiniowane w kartach UIC, normach europejskich oraz przepisach TSI.
The article presents the standardization condition of wheelsets that belong to the busiest part in the railway. The significance of qR parameter is discussed taking into account its impact as the safety of riding, necessity of repairs and maintenance. The permissible limited dimensions of the parameter due to the operational safety are presented. They are defined in UIC leaflets, the European standard and the TSI regulations.
Źródło:
Rail Vehicles/Pojazdy Szynowe; 2015, Nr 1; 22-29
0138-0370
2719-9630
Pojawia się w:
Rail Vehicles/Pojazdy Szynowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor network scheduling for identification of spatially distributed processes
Autorzy:
Uciński, D.
Powiązania:
https://bibliotekanauki.pl/articles/331382.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sieć sensorowa
estymacja parametrów
układ o parametrach rozłożonych
macierz informacyjna Fishera
sensor network
parameter estimation
distributed parameter system
optimum experimental design
Fisher information matrix
Opis:
The work treats the problem of fault detection for processes described by partial differential equations as that of maximizing the power of a parametric hypothesis test which checks whether or not system parameters have nominal values. A simple node activation strategy is discussed for the design of a sensor network deployed in a spatial domain that is supposed to be used while detecting changes in the underlying parameters which govern the process evolution. The setting considered relates to a situation where from among a finite set of potential sensor locations only a subset of them can be selected because of the cost constraints. As a suitable performance measure, the Ds-optimality criterion defined on the Fisher information matrix for the estimated parameters is applied. The problem is then formulated as the determination of the density of gauged sites so as to maximize the adopted design criterion, subject to inequality constraints incorporating a maximum allowable sensor density in a given spatial domain. The search for the optimal solution is performed using a simplicial decomposition algorithm. The use of the proposed approach is illustrated by a numerical example involving sensor selection for a two-dimensional diffusion process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 25-40
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor network design for the estimation of spatially distributed processes
Autorzy:
Uciński, D.
Patan, M.
Powiązania:
https://bibliotekanauki.pl/articles/929585.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
projekt optymalny
estymacja parametrów
sieć sensorowa
identyfikacja źródłowa
optimal experiment design
parameter estimation
sensor network
source identification
Opis:
In a typical moving contaminating source identification problem, after some type of biological or chemical contamination has occurred, there is a developing cloud of dangerous or toxic material. In order to detect and localize the contamination source, a sensor network can be used. Up to now, however, approaches aiming at guaranteeing a dense region coverage or satisfactory network connectivity have dominated this line of research and abstracted away from the mathematical description of the physical processes underlying the observed phenomena. The present work aims at bridging this gap and meeting the needs created in the context of the source identification problem. We assume that the paths of the moving sources are unknown, but they are sufficiently smooth to be approximated by combinations of given basis functions. This parametrization makes it possible to reduce the source detection and estimation problem to that of parameter identification. In order to estimate the source and medium parameters, the maximum--ikelihood estimator is used. Based on a scalar measure of performance defined on the Fisher information matrix related to the unknown parameters, which is commonly used in optimum experimental design theory, the problem is formulated as an optimal control one. From a practical point of view, it is desirable to have the computations dynamic data driven, i.e., the current measurements from the mobile sensors must serve as a basis for the update of parameter estimates and these, in turn, can be used to correct the sensor movements. In the proposed research, an attempt will also be made at applying a nonlinear model-predictive-control-like approach to attack this issue.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 3; 459-481
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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