Skocz do pozycji: 1.

Tytuł:

Sensitivity analysis of deterministic signaling pathways models

Autorzy:

Puszyński, K.
Lachor, P.
Kardyńska, M.
Śmieja, J.

Powiązania:

https://bibliotekanauki.pl/articles/201589.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

signaling pathways
sensitivity analysis

Opis:

The paper is focused on application of sensitivity methods to analysis of signaling pathway models. Two basic methods are compared: local, based on standard sensitivity functions, and global, based on Sobol indices. Firstly, a general outline of modeling of signaling pathways by means of ordinary differential equations is briefly described. Afterwards, the methods of sensitivity analysis, known from literature, are introduced and illustrated with a simple example of a dynamical system of the second order. Subsequently, the analysis of the p53/Mdm2 regulatory module, which is a key element of any pathway involving p53 protein, is presented. The results of this analysis suggest that no single method should be chosen for investigation of any signaling pathway model but several of them should be applied to answer important questions about sources of heterogeneity in cells behavior, robustness of signaling pathways and possible molecular drug targets.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 471-479
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Economic analysis of implementing VMI model using game theory

Autorzy:

Stehel, Vojtěch
Vochozka, Marek
Kliestik, Tomas
Bakes, Vladimir

Powiązania:

https://bibliotekanauki.pl/articles/19090921.pdf

Data publikacji:

2019

Wydawca:

Instytut Badań Gospodarczych

Tematy:

VMI
game theory
sensitivity analysis

Opis:

Research background: The article deals with implementing VMI between the supplier and customer. To assess whether the system will be implemented, the evolution game theory is used. The contribution is based on the limitations of the study of the evolutionary game theory approach to modelling VMI policies (Torres et al., 2014) and its later extension, The evolutionary game theory approach to modelling VMI policies (Torres & García-Díaz, 2018). It aims is to complement the studies and provide a comprehensive picture of the issue. Purpose of the article: The main objective of the contribution is to respond to the question whether the VMI system will be introduced between the supplier and customer. Methods: In the first phase, the matrix is analysed from the point of view of the game meaning and its limit parameters. The limit parameters are set taking into account the economic reality. The only examined states of the matrix are those where the result is not obvious. For the purposes of the contribution, we work with a 5-year period. A new software capable of calculating evolutionary focus and their stability is created. Sensitivity analysis is carried out for the individual parameters that affect the system behaviour. Findings & Value added: Value added is a complex description of the system and complementation of previous studies in this field. VMI is confirmed. The results obtained can be used for practical management, so that the managers are able to identify what the actual costs are and what the probability of introducing the system is. At the same time, they can identify the parameters that can be influenced by them and observe their impact on the shift of the system introduction probability.

Źródło:

Oeconomia Copernicana; 2019, 10, 2; 253-272
2083-1277

Pojawia się w:

Oeconomia Copernicana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

High order sensitivity analysis of a mistuned blisk including intentional mistuning

Autorzy:

Pohle, L.
Tatzko, S.
Panning-von Scheidt, L.
Wallaschek, J.

Powiązania:

https://bibliotekanauki.pl/articles/281842.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

turbine blades
mistuning
sensitivity analysis

Opis:

Small deviations between turbine blades exist due to manufacturing tolerances or material inhomogeneities. This effect is called mistuning and usually causes increased vibration amplitudes and also a lower service life expectancy of bladed disks or so called blisks (bladed integrated disk). The major resulting problem is to estimate the maximum amplitude with respect to these deviations. Due to the probability distribution of these deviations, statistical methods are used to predict the maximum amplitude. State of the art is the Monte-Carlo simulation which is based on a high number of randomly re-arranged input parameters. The aim of this paper is to introduce a useful method to calculate the probability distribution of the maximum amplitude of a mistuned blisk with respect to the random input parameters. First, the applied reduction method is presented to initiate the sensitivity analysis. This reduction method enables the calculation of the frequency response function (FRF) of a Finite Element Model (FEM) in a reasonable calculation time. Based on the Taylor series approximation, the sensitivity of the vibration amplitude depending on normally distributed input parameters is calculated and therewith, it is possible to estimate the maximum amplitude. Calculating only a single frequency response function shows a good agreement with the results of over 1000 Monte-Carlo simulations.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 353-368
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Sensivity and design of fiber layout in composites

Autorzy:

Dems, K.

Powiązania:

https://bibliotekanauki.pl/articles/279497.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

sensitivity analysis
composites
fiber layout
optimization

Opis:

For a linear structure reiforced with elastic fibers, the first variation of an arbitrary behavioral functional corresponding to variation of shape or orientation of fibers is derived by using the direct approach to sensivity analysis. The relevant optimality conditions for optimal design and identification problems are then derived. Both the static and dynamic loading cases are considered. Some simple examples illustrate the applicability of the presented approach.
Wrażliwość i projektowanie ułożenia włókien w kompozycie. W pracy rozpatrzono pierwszą wariację dowolnego funkcjonału związaną z wariacją kształtu lub orientacji wzmacniających włókien w płaskiej liniowo-sprężystej tarczy. Wrażliwości rozpatrywanego funkcjonału wyznaczono wykorzystując metodę bezpośrednią analizy wrażliwości. Następnie sformułowano typowy problem optymalnego projektowania oraz problem identyfikacyjny i wyznaczono odpowiednie warunki optymalności. Rozpatrzono zarówno przypadek obciążeń statycznych, jak i dynamicznych.

Źródło:

Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 807-818
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

A remark on sensitivity in linear programming and Gale-Samuelson nonsubstitution theorem

Autorzy:

De Giuli, M. E.
Giorgi, G.

Powiązania:

https://bibliotekanauki.pl/articles/969906.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

linear programming
sensitivity analysis
nonsubstitution theorem

Opis:

The main purpose of this paper is to show that David Gale's result (1960, Lemma 9.3 on sensitivity in linear programming) is not generally valid. In this lemma, additional assumptions, that are instead required, are not made. We give some correct versions of the above mentioned lemma, and with these an elementary proof of the Gale-Samuelson nonsubstitution theorem.

Źródło:

Control and Cybernetics; 2010, 39, 3; 827-838
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Sensitivity Analysis and Optimization for Selected Supply Chain Management Issues in the Company – Using System Dynamics and Vensim

Autorzy:

Kasperska, Elżbieta
Mateja-Losa, Elwira
Marjasz, Rafał

Powiązania:

https://bibliotekanauki.pl/articles/475034.pdf

Data publikacji:

2013

Wydawca:

Fundacja Upowszechniająca Wiedzę i Naukę Cognitione

Tematy:

System Dynamics
sensitivity analysis
optimization
Vensim

Opis:

The aim of our paper is to present the new results of research work on optimization and simulation for some logistic problems in the company. The System Dynamics (SD) method and the Vensim simulation language are applied in order to solve specific managerial problems described by Forrester in the model of supply chain. The historical model of Customer-Producer-Employment System by Forrester (Forrester, 1961) has not been examined with the sensitivity analysis, from the “automatic” testing perspective. Optimization experiments have not been conducted, either. It is surprising, since the model is old and widely known. The opportunities offered by the Vensim language allow us to perform such analysis. The visualization called “confidence bounds“ is used, to show the behaviour of chosen variables over a period of time. The Monte-Carlo method is applied for sampling a set of numbers from within bounded domains (distribution for each searching parameters is specified). The authors of this paper conducted numerous experiments in this scope. This paper presents their results and offers some conclusions formulated at the end.

Źródło:

Journal of Entrepreneurship, Management and Innovation; 2013, 9, 2; 29-44
2299-7075
2299-7326

Pojawia się w:

Journal of Entrepreneurship, Management and Innovation

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Exploring the role of socio-economic and built environment driving factors in shaping the commuting modal share: a path-analysis-based approach

Autorzy:

Boukarta, Soufiane
Berezowska-Azzag, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/1050982.pdf

Data publikacji:

2020-12-21

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

commuting
questionnaire
sensitivity analysis
path analysis
Djelfa (Algeria)

Opis:

This paper explores the role of the built environment and socio-economic drivers in shaping the modal share of commuting. For this, we have identified through our literature review 67 potential variables categorised into two groups; the built environment and the households’ socio-economic characteristics. We have considered the city of Djelfa as a case study and used the questionnaire as a data collection tool. The questionnaire processing of the 700 questionnaires provided to the households allowed us to select 184 questionnaires for our analysis. The sensitivity analysis protocol is designed for two stages; (i) an exploratory stage, conducted by principal component analysis and bivariate correlation analysis; (ii) and a confirmatory stage conducted by a path analysis. The first step allowed us to hypothesise several causal pathways that could explain, directly or indirectly, the modal share of commuting. The results of the path analysis show that the modal shares of walking, private car and public transit are controlled by 13, 16 and 12 explanatory variables, respectively. Overall, the socio-economic characteristics of households discourage walking and transit use, and encourage private car commuting. On the other hand, the variables identified in this paper related to the built environment discourage walking, but encourage the use of public transit rather than private cars for commuting.

Źródło:

Quaestiones Geographicae; 2020, 39, 4; 87-107
0137-477X
2081-6383

Pojawia się w:

Quaestiones Geographicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Sensitivity analysis of a fuzzy expert system for modelling dependencies in human operators’ emergency tasks

Autorzy:

Zio, E.
Baraldi, P.
Librizzi, M.
Podofillini, L.
Dang, H. V.

Powiązania:

https://bibliotekanauki.pl/articles/2069589.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności

Tematy:

human reliability analysis
fuzzy expert system
sensitivity analysis

Opis:

This paper analyzes the behaviour of a fuzzy expert system for evaluating the dependence among successive operator actions, through a sensitivity analysis on the fuzzy input partitioning and assessment. Preliminary results are presented with respect to a case study concerning two successive tasks of an emergency procedure in a nuclear reactor. Work is in progress to perform a thorough sensitivity analysis to generalize the results obtained.

Źródło:

Journal of Polish Safety and Reliability Association; 2007, 2; 379--389
2084-5316

Pojawia się w:

Journal of Polish Safety and Reliability Association

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Sensitivity analysis of performance of Nigerian ports using data envelopment analysis

Autorzy:

Nze, Obiageli N.
Ejem, Ejem Agwu

Powiązania:

https://bibliotekanauki.pl/articles/2141047.pdf

Data publikacji:

2020

Wydawca:

Fundacja Centrum Badań Socjologicznych

Tematy:

Nigerian ports
sensitivity analysis
data envelopment analysis
sustainability

Opis:

With cognizance to some differences among the ports and complexities in productivity measurement, the research tries to identify and evaluate productive issues in terms of technical efficiencies (managerial efficiency) and scale efficiencies (managerial and allocative efficiency) experienced at individual Nigeria ports. It equally provided a technical benchmark for assessing the overall efficiencies of the respective ports in Nigeria during the pre-concessioned and post-concessioned era. The level of inputs required for each DMU to be efficient is given i.e. for DMU 2014 to be efficient input-wise, the number of berth may be reduced by two units as a result of idleness of this two (2) berths, the average turnaround time may be reduced by 3 hours and the berth occupancy may be reduced by 3%. Since a fixed asset such as berth cannot be reduced therefore technically and complimentarily the turnaround time and berth occupancy rate need to be decreased more than 5 hours and 3% respectively by allocating the queue ship at the over-utilized berth to the idle berths which in turn will mitigate underutilization of this berths been required to be reduced or alternatively the port should embrace more cargo handling technology to enhance fast loading and discharging of cargoes thus attracting more vessels to the Port.

Źródło:

Journal of Sustainable Development of Transport and Logistics; 2020, 5, 1; 37-47
2520-2979

Pojawia się w:

Journal of Sustainable Development of Transport and Logistics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Constructing improvement plan for inputs through dialogue with DM about DEA-Efficiency for DMUs

Autorzy:

Uemura, Y.

Powiązania:

https://bibliotekanauki.pl/articles/206812.pdf

Data publikacji:

1999

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

evaluation efficiency
partial improvement plan
sensitivity analysis

Opis:

Evaluation of efficiency of the DMUs (Decision Making Units) in a company is a very important problem. Thus, the studies of evaluation of efficiency are being actively carried out on the basis of the production functions, for example Cobb-Douglas production function and fuzzy loglinear production function (fuzzy Cobb-Douglas model). Recently, DEA (Data Envelopment Analysis) was applied to evaluation of efficiency, in the sense of benchmarking evaluation. After having evaluated DMUs by DEA, we obtain the improvement plan for every input in the inefficient DMUs. Though we many not be able to decrease inputs at one time according to the DEA plan, it is natural to construct some phased improvement plans for decreasing the inputs. First, we propose to support the construction of some phased improvement plans by the sensitivity analysis for the evaluated efficiency by applicatiion of definite limits to the decrease of inputs. Second, we evaluate this method by applying it to the case of bank data.

Źródło:

Control and Cybernetics; 1999, 28, 1; 133-139
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Sensitivity analysis of biological tissue freezing process with respect to the radius of spherical cryoprobe
Analiza wrażliwości procesu zamrażania tkanki biologicznej ze względu na promień kriosondy sferycznej

Autorzy:

Majchrzak, E.
Kałuża, G.

Powiązania:

https://bibliotekanauki.pl/articles/280301.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

freezing process
boundary element method
sensitivity analysis

Opis:

Application of the shape sensitivity analysis to the case of problems of the biological tissue freezing process is discussed. The freezing process described by a strongly non-linear bioheat transfer equation in which an additional term controlling the evolution of latent heat appears. Using the approach called 'the one domain method', one finally obtains a partial differential equation containing the substitute thermal capacity of tissue. The boundary and initial conditions determine the thermal interaction between the tissue and cryoprobe tip. In the paper, we consider a spherical internal cryoprobe. In order to estimate the influence of cryoprobe geometry on the course of the process, the shape sensitivity analysis is applied. In particular, a direct approach is used (explicit differentiation method). The results of numerical modeling (the boundary element method is applied) allow one to formulate essential practical conclusions concerning the course of cryosurgery treatments.
Praca dotyczy zastosowania analizy wrażliwości kształtu w zagadnieniach modelowaniaprocesuzamrażania tkanki biologicznej. Proces ten jest opisany silnie nieliniowym równaniem przepływu biociepła, w którym pojawia się dodatkowy składnik związany z wydzielaniem się utajonego ciepła zamrażania. Formalne przekształcenia wyjściowego równania opisującego proces prowadzi do równania różniczkowego, w którym występuje zastępcza pojemność cieplna tkanki (tzw. metoda jednego obszaru). Odpowiednio przyjęte warunki brzegowe determinują oddziaływania termiczne między tkanką a końcówką kriosondy. W pracy rozważa się sferyczną kriosondę wewnętrzną. VV celu oszacowania wpływu geometrii kriosondy na przebieg procesu zamrażania wykorzystano podejście bezpośrednie analizy wrażliwości kształtu. Wyniki obliczeii numerycznych otrzymane za pomocą metody elementów brzegowych pozwoliły na sformułowanie wniosków przydatnych w praktyce kriochirurgicznej.

Źródło:

Journal of Theoretical and Applied Mechanics; 2006, 44, 2; 381-392
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Process of separating acetonitrile and water using LTTMs as entrainer

Autorzy:

Li, Chengshuai
Ma, Wencheng

Powiązania:

https://bibliotekanauki.pl/articles/2081511.pdf

Data publikacji:

2021

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

LTTMs
ACN
Simulation
Extraction distillation
Sensitivity analysis

Opis:

New extractive distillation confi gurations, which use low transition temperature mixtures (LTTMs) as entrainers, have attracted widespread attention among scholars due to their green processes. Furthermore, the design and comparison of different processes can promote the application of new solvents in the future. In this study, two extractive distillation processes, the extractive distillation column (ED) and the extraction dividing wall column (EDW), were selected from previous work. The separation process of acetonitrile (ACN)-water ternary mixtures was studied, and GC3:1(choline chloride/glycolic acid mixture (molar mass 1:3)) and EC2:1((choline chloride/ethylene glycol 1:2 molar mass) were used as entrainers. Minimum consumption energy and the purity of ACN and water were set as the goals, and our sensitivity analysis and economic evaluation results showed that both ED and EDW were effective. As a result, LTTMs can be used in extractive distillation for azeotrope separation.

Źródło:

Polish Journal of Chemical Technology; 2021, 23, 4; 1-9
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Sensitivity analysis as a tool to optimise Human Development Index

Autorzy:

Kuc-Czarnecka, Marta

Powiązania:

https://bibliotekanauki.pl/articles/22446409.pdf

Data publikacji:

2019

Wydawca:

Instytut Badań Gospodarczych

Tematy:

Human Development Index
composite indicators
sensitivity analysis

Opis:

Research background: Composite indicators are commonly used as an approximation tool to measure economic development, the standard of living, competitiveness, fairness, effectiveness, and many others being willingly implemented into many different research disciplines. However, it seems that in most cases, the variable weighting procedure is avoided or erroneous since, in most cases, the so-called ?weights by belief? are applied. As research show, it can be frequently observed that weights do not equal importance in composite indicators. As a result, biased rankings or grouping of objects are obtained. Purpose of the article: The primary purpose of this article is to optimise and improve the Human Development Index, which is the most commonly used composite indicator to rank countries in terms of their socio-economic development. The optimisation will be done by re-scaling the current weights, so they will express the real impact of every single component taken into consideration during HDI?s calculation process. Methods: In order to achieve the purpose mentioned above, the sensitivity analysis tools (mainly the first-order sensitivity index) were used to determine the appropriate weights in the Human Development Index. In the HDI?s resilience evaluation process, the Monte Carlo simulations and full-Bayesian Gaussian processes were applied. Based on the adjusted weights, a new ranking of countries was established and compiled with the initial ranking using, among others, Kendall tau correlation coefficient. Findings & Value added: Based on the data published by UNDP for 2017, it has been shown that the Human Development Index is built incorrectly by putting equal weights for all of its components. The weights proposed by the sensitivity analysis better reflect the actual contribution of individual factors to HDI variability. Re-scaled Human Development Index constructed based on proposed weights allow for better differentiation of countries due to their socio-economic development.

Źródło:

Equilibrium. Quarterly Journal of Economics and Economic Policy; 2019, 14, 3; 425-440
1689-765X
2353-3293

Pojawia się w:

Equilibrium. Quarterly Journal of Economics and Economic Policy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Synthesis of a pumping unit with consideration of a flexible member in the system

Autorzy:

Sapietová, A.
Sekerka, M.
Vaško, M.
Sapieta, M.

Powiązania:

https://bibliotekanauki.pl/articles/102969.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

torque
sensitivity analysis
multibody systems
MSC ADAMS

Opis:

To achieve a correct function and maximal effectiveness of a pumping unit, it is necessary to correctly design the input dynamic parameters. This paper will present sensitivity analysis, which aims to find appropriate input parameters needed to realize the prescribed work tasks from the point of view of consideration of flexible member in the system.

Źródło:

Advances in Science and Technology. Research Journal; 2016, 10, 31; 119-123
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Fuzzy global sensitivity analysis of fuzzy net present value

Autorzy:

Sari, I. D.
Kuchta, D.

Powiązania:

https://bibliotekanauki.pl/articles/206340.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

fuzzy sensitivity analysis
fuzzy net present value

Opis:

The cash flows of an investment project are influenced by several factors. All the factors influencing fuzzy net present value of a project should be taken into account, together with their variability, in order to analyze the whole project, and to make the best decisions during the project’s life. In this paper a fuzzy global sensitivity analysis method is proposed for fuzzy net present value to determine the influences of the factors on the worth of an investment project. The results of the proposed method for an application are also interpreted.

Źródło:

Control and Cybernetics; 2012, 41, 2; 481-496
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Sensitivity analysis of an identification method dedicated to nonlinear systems working under operational loads
Analiza wrażliwości metody identyfikacji układów nieliniowych w warunkach eksploatacyjnych

Autorzy:

Iwaniec, J.

Powiązania:

https://bibliotekanauki.pl/articles/281049.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

sensitivity analysis
nonlinear system identification
operational loads

Opis:

In the paper, the exploitational nonlinear systems identification method based on algorithms of the restoring force, boundary perturbations and direct parameter identification methods is presented. The obtained parameter estimates provide information concerning forces transferred on the foundation and find application in the model-based diagnostics. The results of the sensitivity analysis carried out in order to assess the influence of input parameters uncertainties (accuracy of resonant frequency and amplitude estimates, errors of transfer function estimation in operational conditions, value of introduced additional mass) on the accuracy of estimated system parameters are also presented.
W pracy przedstawiono metodę operacyjnej identyfikacji parametrów modeli nieliniowych konstrukcji mechanicznych, realizowaną w oparciu o algorytmy metody sił resztkowych, zaburzeń brzegowych oraz bezpośredniej identyfikacji parametrów. Uzyskane estymaty parametrów dostarczają informacji o siłach przekazywanych na pod- łoże i znajdują zastosowanie w diagnostyce realizowanej w oparciu o model układu nieuszkodzonego. W celu oszacowania wpływu niepewności parametrów wejściowych na dokładność estymowanych parametrów układu, przeprowadzono analizę wrażliwości poszukiwanych parametrów układu (masy, sztywności, tłumienia) na dokładność estymacji częstotliwości i amplitud rezonansowych (uwarunkowaną błędami estymacji funkcji przejścia w warunkach eksploatacyjnych), a także wartość masy wprowadzanej do układu w celu zmodyfikowania jego własności dynamicznych (zgodnie z algorytmem metody zaburzeń brzegowych).

Źródło:

Journal of Theoretical and Applied Mechanics; 2011, 49, 2; 419-438
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Vibration diagnostics of footbridge with use of rotation sensor

Autorzy:

Banaś, A.
Wilde, K.

Powiązania:

https://bibliotekanauki.pl/articles/1395589.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

vibrational diagnostics
footbridge
sensitivity analysis
rotation sensors

Opis:

The benefits of the additional measurement of rotational degrees of free-dom on the performance of the vibration diagnosis of bridges are studied in this paper. The common vibrational diagnostics that uses translational degrees of freedom is extended by measurements of rotations. The study is curried out on a footbridge and the presence of damage as well as its location and size is determined with use of FEM updating procedure. The results showed that rotational degrees of freedom significantly improve the effectiveness of the vibrational method.

Źródło:

Applied Computer Science; 2014, 10, 4; 38-49
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

A comprehensive mathematical programming model for minimizing costs in a multiple-item reverse supply chain with sensitivity analysis

Autorzy:

Mahmoudi, H.
Fazlollahtabar, H.

Powiązania:

https://bibliotekanauki.pl/articles/407169.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

reverse supply chain
mathematical modeling
sensitivity analysis

Opis:

These instructions give you guidelines for preparing papers for IFAC conferences. A reverse supply chain is configured by a sequence of elements forming a continuous process to treat return-products until they are properly recovered or disposed. The activities in a reverse supply chain include collection, cleaning, disassembly, test and sorting, storage, transport, and recovery operations. This paper presents a mathematical programming model with the objective of minimizing the total costs of reverse supply chain including transportation, fixed opening, operation, maintenance and remanufacturing costs of centers. The proposed model considers the design of a multi-layer, multi-product reverse supply chain that consists of returning, disassembly, processing, recycling, remanufacturing, materials and distribution centers. This integer linear programming model is solved by using Lingo 9 software and the results are reported. Finally, a sensitivity analysis of the proposed model is also presented.

Źródło:

Management and Production Engineering Review; 2014, 5, 3; 42-52
2080-8208
2082-1344

Pojawia się w:

Management and Production Engineering Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

GIS as a Support Tool for Sensitivity and Decision-Making Analysis for Transport Infrastructure Development

Autorzy:

Păunescu, Cosmin
Dobre, Robert
Comănescu, Laura
Drăghici, Traian
Nedelea, Alexandru

Powiązania:

https://bibliotekanauki.pl/articles/2069905.pdf

Data publikacji:

2021

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

GIS
transport infrastructure development
sensitivity analysis
decision-making analysis

Opis:

The sustainable implementation of highway projects requires a sensitivity analysis of the terrain and all of its components that have a direct influence on road design, construction and operation. The result of this inquiry involving GIS techniques and methods regarding environmental and economic factors helps in choosing the optimal road route, in order to meet the real-world connectivity requirements. The sensitivity analysis can be applied to road and rail infrastructure projects, aiming to develop a decision-making tool that can be employed by their potential beneficiaries, according to their purposes and interests. This paper aims to create an objective decision-making tool for transport infrastructure development in correlation with the current needs of society regarding the development of transport infrastructure in an economic sustainable manner with low environmental impact. Furthermore, the study tries to identify the best highway corridor in an area with environmental constraints (especially geomorphological), that is in balance with both environment and financial resources.

Źródło:

Rocznik Ochrona Środowiska; 2021, 23; 23--41
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Expressing and communicating uncertainty in relation to quantitative risk analysis (QRA)

Autorzy:

Flage, R.
Aven, T.

Powiązania:

https://bibliotekanauki.pl/articles/2069562.pdf

Data publikacji:

2008

Wydawca:

Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności

Tematy:

quantitative risk analysis
QRA
uncertainty
sensitivity analysis
decision support

Opis:

A quantitative risk analysis (QRA) should provide a comprehensive, informative and balanced picture of risk, in order to support decisions. To achieve this, a proper treatment of uncertainty is a prerequisite. Most approaches to treatment of uncertainty in QRA seem to be based on the thinking that uncertainty relates to the calculated probabilities and expected values. This causes difficulties when it comes to communicating what the analysis results mean, and could easily lead to weakened conclusions if large uncertainties are involved. An alternative approach is to hold uncertainty as a main component of risk, and regard probabilities as epistemic-based expressions of uncertainty. In the paper the latter view is taken, and we describe what should be the main pillars of a risk description following this approach. We also indicate how this approach should relate to decision-making. An important issue addressed is how to communicate the shortcomings and limitations of probabilities and expected values. Sensitivity analysis plays a key role in this regard. An example is included to illustrate ideas and findings.

Źródło:

Journal of Polish Safety and Reliability Association; 2008, 1; 109--115
2084-5316

Pojawia się w:

Journal of Polish Safety and Reliability Association

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

The influence of built environment and socio-economic factors on commuting energy demand. A path analysis-based approach

Autorzy:

Boukarta, Soufiane
Berezowska-Azzag, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/15805631.pdf

Data publikacji:

2022

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

Djelfa (Algeria)
energy consumption
path analysis
sensitivity analysis
commuting

Opis:

Transport is the second energy consumer sector after housing in Algeria. In this article, we explore the ener- gy implication of commuting by considering a panel of socio-economic (SE) and built environment (BE) driving factors. The method is based on four steps: (i) The first step is to identify the main and potential drivers from the literature review and to propose a model that summarises the main assumptions that could explain the volume of commuting and the resulting energy consumption. (ii) In the second step, we designed and distributed 700 questionnaires in the municipality of Djelfa and retained 184 valid questionnaires in the final study sample. (iii) In the third step, we developed a method adapted to urban areas to quantify energy consumption as a function of the distance travelled, the type and density of occupation by means of transport and the type of fuel. (iv) The fourth step is to check the fit of the hypothetical model with a path analysis-based approach. The model developed identifies 15 factors, of which five have a direct impact and 10 have an indirect impact on the energy consumption of commuting. The model shows that building density and the age of the respondent can reduce the energy consumption of commuting by up to −15% and −12% respectively; whereas the number of cars by housing and the round-trip frequency could increase the energy consumption up to 38% and 27% respectively. Our results suggest a structuring role of the socio-economic characteristics of households in explaining the energy consumption of commuting.

Źródło:

Quaestiones Geographicae; 2022, 41, 4; 19-39
0137-477X
2081-6383

Pojawia się w:

Quaestiones Geographicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Unreported standard errors in meta-analysis

Autorzy:

Longford, Nicholas T.

Powiązania:

https://bibliotekanauki.pl/articles/1917016.pdf

Data publikacji:

2021-12-08

Wydawca:

Główny Urząd Statystyczny

Tematy:

empirical Bayes
imputation
meta-analysis
missing value
sensitivity analysis

Opis:

A study that would otherwise be eligible is commonly excluded from a meta-analysis when the standard error of its treatment-effect estimator, or the estimate of the variance of the outcomes, is not reported and cannot be recovered from the available information. This is wasteful when the estimate of the treatment effect is reported. We assess the loss of information caused by this practice and explore methods of imputation for the missing variance. The methods are illustrated on two sets of examples, one constructed specifically for illustration and another based on a published systematic review.

Źródło:

Statistics in Transition new series; 2021, 22, 4; 1-17
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Numerical evaluation of sensitivity of stress distribution in bone to geometric parameters of endoprosthesis

Autorzy:

Kowalczyk, P.

Powiązania:

https://bibliotekanauki.pl/articles/280295.pdf

Data publikacji:

1999

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

biomechanics
sensitivity analysis
finite element method
contact problems

Opis:

One of serious drawbacks in the bone endoprosthetics is the implant separation from bone or cement. Stress concentrations on the implant surface are deemed major factor in this process and implant shape optimization seems to be a natural way of improvement of stress disrtibution. An important tool in effective optimization algorithms is design sensitivity analysis (DSA). The discretized formulation of the problem in terms of the finite element method is presented in this paper. A three-dimensional model of femur with a cementless implant analysed. Frictionless contact and perfect bonding are assumed on the smooth and rough parts of the implant surface, respectively. Computational examples show the stress concentrations and their sensitivity to various geometric parameters of the implant.
Jednym z poważnych mankamentów endoprotetyki stawów jest odrywanie się implantu od cementu lub kości. Główną przyczyną tego zjawiska są koncentracje naprężeń na powierzchni implantu. Optymalizacja kształtu implantu jest uważana za naturalną drogę do przeciwdziałania temu zjawisku. Ważnym narzędziem w algorytmach optymalizacji jest analiza wrażliwości parametrycznej (DSA). Praca przedstawia sformułowanie zagadnienia wrażliwości w zdyskretyzowanym ujęciu metody elementów skończonych. Analizowana jest kość udowa z implantem bezcementowym o powierzchni gładkiej, a w górnej części porowatej. Przykłady numeryczne przedstawiają koncentracje naprężeń w tkance kostnej i ich wrażliwość na różne parametry kształtu implantu.

Źródło:

Journal of Theoretical and Applied Mechanics; 1999, 3; 555-577
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Failure simulation of Babar dam – Algeria and its impact on the valley downstream section

Autorzy:

Gaagai, Aissam
Boudoukha, Abderrahmane
Benaabidate, Lahcen

Powiązania:

https://bibliotekanauki.pl/articles/292897.pdf

Data publikacji:

2020

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

dam
dam failure
Hec-Ras
sensitivity analysis
simulation

Opis:

A failure analysis of Babar dam on the El Arab River was performed to highlight the impact of flood wave and velocities on the four villages downstream of the dam; Hella, Khérenne, Chebla and El Oueldja. The simulation of wave propagation along the El Arab River under several scenarios was performed by the hydraulic HEC-RAS model. This model is dedicated to the description of floods at the dam following a breach in the dike. The main factors considered in this simulation include the level of flood water, the flood hydrograph, and the typical scenario for this breach. The flood risk analysis revealed that the maximum of flood wave flow registered at the breach is (Q_max = 9253.02 m³∙s^{–1), and is beginning to mitigate downstream of the dam along the El Arab River where it reached at the last village with a low flow (Q = 1110.64 m3∙s–1). This simulation allowed drawing the risk map which showed the areas threatened by flood wave resulting from a total failure of the work, and consequently required a plan of security measures to moderate as much as possible the consequences of floods. A sensitivity analysis was conducted to approach the parameters of impact of the breach on the dam failure scenario. It was confirmed that these parameters as formulation time, breach width and side slope have a great influence on the dam failure scenario with the four adjustments (±20 and ±50).}

Źródło:

Journal of Water and Land Development; 2020, 44; 75-89
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Simulation and sensitivity analysis for biodiesel production in a reactive distillation column

Autorzy:

Agarwal, M.
Singh, K.
Chaurasia, S. P.

Powiązania:

https://bibliotekanauki.pl/articles/779118.pdf

Data publikacji:

2012

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

biodiesel
reactive distillation
modeling
simulation
transesterification
sensitivity analysis

Opis:

The conventional process for biodiesel production by transesterification is still expensive due to a need of high excess of alcohol required and its recovery by distillation. The use of a reactive distillation process can reduce the amount of alcohol in the feed stream as it works on a simultaneous reaction and separation. In the present study, a mathematical model has been developed for biodiesel production from triglycerides in a reactive distillation column, which has been validated with the reported data and CHEMCAD results. The effects of process parameters such as methanol to oil feed ratio, feed temperature, and reaction time have been investigated. The sensitivity analysis shows that yield of ester increases with methanol to oil ratio and number of stages, however, it decreases with fl ow rate. The MATLAB simulated results show that methanol to oil molar ratio of 5:1 produces 90% (by wt.) of methyl ester in a residence time of 4.7 minutes.

Źródło:

Polish Journal of Chemical Technology; 2012, 14, 3; 59-65
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Sensitivity analysis of signaling pathway models based on discrete-time measurements

Autorzy:

Kardynska, M.
Smieja, J.

Powiązania:

https://bibliotekanauki.pl/articles/229721.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sensitivity analysis
signaling pathways
measurement uncertainty
discretetime measurements

Opis:

The paper is focused on sensitivity analysis of large-scale models of biological systems that describe dynamics of the so called signaling pathways. These systems are continuous in time but their models are based on discrete-time measurements. Therefore, if sensitivity analysis is used as a tool supporting model development and evaluation of its quality, it should take this fact into account. Such models are usually very complex and include many parameters difficult to estimate in an experimental way. Changes of many of those parameters have little effect on model dynamics, and therefore they are called sloppy. In contrast, other parameters, when changed, lead to substantial changes in model responses and these are called stiff parameters. While this is a well-known fact, and there are methods to discern sloppy parameters from the stiff ones, they have not been utilized, so far, to create parameter rankings and quantify the influence of single parameter changes on system time responses. These single parameter changes are particularly important in analysis of signalling pathways, because they may pinpoint parameters, associated with the processes to be targeted at the molecular level in laboratory experiments. In the paper we present a new, original method of creating parameter rankings, based on an Hessian of a cost function which describes the fit of the model to a discrete experimental data. Its application is explained with simple dynamical systems, representing two typical dynamics exhibited by the signaling pathways.

Źródło:

Archives of Control Sciences; 2017, 27, 2; 239-250
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Sensitivity Analysis of the Nasgro Equation Based on the PZL-130 TC-II Orlik Trainer Aircraft Full Scale Fatigue Test

Autorzy:

Reymer, Piotr
Leski, Andrzej
Kurdelski, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/24201173.pdf

Data publikacji:

2022

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

sensitivity analysis
crack propagation
full scale fatigue test

Opis:

The study investigates the sensitivity of numerical crack propagation estimations based on the Nasgro equation. The equation is widely used for crack propagation calculations since it considers the whole range of crack propagation speed from threshold to critical values of stress intensity factor range (∆K). The presented investigation is based on the actual results of the full scale fatigue test (FSFT) of the PZL-130 ‘Orlik’ TC-II aircraft. We provide a brief description of the test and the general approach followed in crack propagation estimations originally carried out after the test. The obtained results are verified in terms of variation of the input data. Overall results are compared and discussed.

Źródło:

Fatigue of Aircraft Structures; 2022, 14; 8--17
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

External wall technological solutions for carbon zero kindergartens in Italy

Autorzy:

Ciacci, Cecilia
Bazzocchi, Frida
Di Naso, Vincenzo

Powiązania:

https://bibliotekanauki.pl/chapters/31234004.pdf

Data publikacji:

2020

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

external envelope
carbon-zero
sensitivity analysis
kindergartens
sustainability

Opis:

For the construction of a carbon zero kindergartens, it is necessary to choose a proper technological solution for the external wall and the material to be used for the insulation layer in the early stages of the design process. Furthermore, in the context of “2030 climate & energy framework” and “2050 low-carbon economy”, from the beginning of the building design, it is fundamental to try to identify the elements that significantly influence energy performance to reduce building energy needs. The main aim of the presented study is to analyse five different technological solutions for an external wall combined with four different materials for the insulation layer. The solutions will be used in a new typological model for a kindergarten and analysed and compared with respect to both environmental impact and energy performance. Results point out that all the technological solutions proposed are valid alternatives to build a carbon-zero kindergarten in Italy. Furthermore, for completeness, a sensitivity analysis was carried out to understand the influence on energy demand of different factors such as, for instance, the type of wall technological solution, the thickness of insulation for wall and roof and the type of solar shading considering different climate zones in Italy.

Źródło:

Innovations – Sustainability – Modernity – Openness. Energy; 45-65
9788366391291

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

MOLPTOL – a software package for sensitivity analysis in MOLP

Autorzy:

Sitarz, Sebastian
Botor, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/2027992.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Ekonomiczny w Katowicach

Tematy:

Computer software
Multi-objective linear programming
Sensitivity analysis

Opis:

The paper introduces a new software package, MOLPTOL, for sensitivity analysis in multi-objective linear programming. In this application, which is available for free of charge on the web page (https:// sites.google.com/view/molptol), the tolerance approach as a measure of sensitivity is used. The motivation for creating MOLPTOL is the lack of such tools to date. MOLPTOL is novel for multi-criteria decision-making methods based on sensitivity analysis. The paper presents some new computational methods for obtaining the supremal tolerances as well.

Źródło:

Multiple Criteria Decision Making; 2021, 16; 140-152
2084-1531

Pojawia się w:

Multiple Criteria Decision Making

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Exergetic analysis of the chitosan-based treatment process for removing polycyclic aromatic hydrocarbons from seawater and sediments

Autorzy:

Cantillo-Figueroa, Maileth
Moreno-Sader, Kariana A.
Gonzalez-Delgado, Angel D.

Powiązania:

https://bibliotekanauki.pl/articles/1844377.pdf

Data publikacji:

2021

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

efficiency
exergy
polycyclic aromatic hydrocarbons
PAHs
sensitivity analysis

Opis:

The Bay of Cartagena (Colombia) is a site of commercial interest owing to its privileged location for maritime operations; however, the discharge of wastewaters from industrial activities and domestic sewage are affecting the water quality, and consequently, the biodiversity of coastal ecosystems. The polycyclic aromatic hydrocarbons (PAHs) are found in sediments and water of main ports, causing severe damage to the ecosystem. Thus, alternatives for the treatment of the Bay of Cartagena’s water and sediments are needed. In this paper, we performed the exergetic analysis of removing PAHs from water and sediments in the Bay of Cartagena using an adsorption-based treatment process with chitosan microbeads and magnetic nanoparticles (CM-TiO2/Fe3O4). The outcomes of exergy of utilities, irreversibilities and exergy losses were calculated using process data and exergy of substances. The Aspen plus V10 software provided the physical exergies, while chemical exergies were gathered from the literature. Overall exergy efficiency of 0.3% was determined for the seawater and sediment treatment facility. A sensitivity analysis was performed to identify the impact and viability of different design alternatives.

Źródło:

Journal of Water and Land Development; 2021, 48; 88-93
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Optimal heat distributions by a gradient-based shape optimization method

Autorzy:

Belhachmi, Z.
Meftahi, B.
Meftahi, H.

Powiązania:

https://bibliotekanauki.pl/articles/206300.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

heat conduction
shape optimization
sensitivity analysis
minimax differentiability

Opis:

In this paper, we consider the problem of locating coated inclusions in a 2D dimensional conductor material in order to obtain a suitable thermal environment. The mathematical model is described by elliptic partial differential equation with linear boundary condition, including heat transfer coefficient. A shape optimization problem is formulated by introducing a cost functional to solve the problem under consideration. The shape sensitivity analysis is rigorously performed for the problem by means of a Lagrangian formulation. The optimization problem is solved by means of gradient-based strategy and numerical experiments are carried out to demonstrate the feasibility of the approach.

Źródło:

Control and Cybernetics; 2018, 47, 1; 33-53
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Modeling of the fascia-mesh system and sensitivity analysis of a junction force after a laparoscopic ventral hernia repair
Modelowanie układu powięź-siatka i analiza wrażliwości siły połączenia po laparoskopowej operacji przepukliny brzusznej

Autorzy:

Szymczak, C.
Lubowiecka, I.
Tomaszewska, A.
Śmietański, M.

Powiązania:

https://bibliotekanauki.pl/articles/279958.pdf

Data publikacji:

2010

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

biomechanics
ventral hernia repair
cable model
sensitivity analysis

Opis:

In the paper, a simple model of the fascia-mesh system is considered to assess the junction force after a laparoscopic hernia repair. The aim of this study is to develop a cable model of the system in order to find the junction force and to distinguish the most important parameters affecting the system junction force. The cable is subjected to a pressure in the abdominal cavity and displacements of the cable edges caused by bends of the patient body. The attention is paid to the junction force sensitivity analysis with respect to initial tension of the mesh, its length and elasticity as well as fascia flexibility. All these parameters are crucial for ventral hernia repair safety. Finally, some concluding remarks important for practicing surgeons and for further more advanced study using two dimensional fascia-mesh models are presented.
W pracy rozpatrywano prosty model układu powięź-siatka do oszacowania siły połączenia siatki z powięzią po laparoskopowej operacji przepukliny brzusznej. Celem pracy jest zastosowanie modelu cięgna do wyznaczenia siły połączenia tego układu oraz do wyznaczenia najważniejszych parametrów mających wpływ na siłę połączenia implantu z powięzią. W tym celu zastosowano analizę wrażliwości siły połączenia względem wariacji początkowej siły rozciągającej siatki, jej długości i modułu sprężystości oraz podatności powięzi. Cięgno jest obciążone ciśnieniem wewnątrz brzusznym oraz przemieszczeniami jego końców wywołanymi skłonami ciała pacjenta. Wszystkie podane wyżej parametry są istotne dla bezpieczeństwa operacji przepukliny. W wyniku pracy sformułowano pewne wnioski ważne dla chirurgów oraz dla dalszych bardziej zaawansowanych badań z zastosowaniem modeli dwuwymiarowych układu powięź-siatka.

Źródło:

Journal of Theoretical and Applied Mechanics; 2010, 48, 4; 933-950
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Modeling of thermal processes proceeding in a 1D domain of crystalline solids using the lattice Boltzmann method with an interval source function

Autorzy:

Piasecka-Belkhayat, A.
Korczak, A.

Powiązania:

https://bibliotekanauki.pl/articles/281185.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

lattice Boltzmann method
directed interval arithmetics
sensitivity analysis

Opis:

The interval lattice Boltzmann method (ILBM) with an uncertainly defined internal heat source function is used to simulate heat transfer in a thin silicone film. The solution to the interval Boltzmann transport equations has been obtained taking into account the rules of directed interval arithmetics. A similar analysis has been done using the sensitivity model where the Boltzmann transport equations and boundary-initial conditions have been differentiated with respect to the no-interval heat source value. The knowledge of the sensitivity function distribution and the application of the Taylor formula allow one to find the border solutions of the problem analyzed, which (to some extent) correspond to the solution obtained under the assumption of the uncertainly defined source function. In the final part of the paper, numerical computations obtained for both methods are presented.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 167-175
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Sensitivity analysis of sandwich beams and plates accounting for variable support conditions

Autorzy:

Studziński, R.
Pozorski, Z.
Garstecki, A.

Powiązania:

https://bibliotekanauki.pl/articles/201924.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sandwich panels
sensitivity analysis
optimal design
support conditions

Opis:

The paper addresses the problems of the sensitivity analysis and optimal design of multi-span sandwich panels with a soft core and flat thin steel facings. The response functional is formulated in a general form allowing wide practical applications. Sensitivity gradients of this functional with respect to dimensional, material and support parameters are derived using adjoint variable method. These operators account for the jump of the slope of a Timoshenko beam or a Reissner plate at the position of concentrated active load or reaction, thus extending the sensitivity operators known in literature. The jump of slope is the effect of shear deformation of the core. Special attention is focussed on sensitivity and optimisation allowing for variable support position and stiffness, because local phenomena observed in supporting area of sandwich plates often initiate failure mechanisms. Introducing optimally located elastic supports allows to reduce the unfavourable influence of temperature on the state of stress. Several examples illustrate the application of derived sensitivity operators and demonstrate their exactness.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 201-210
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

The influence of boundary condition functions on the quality of the solution and its sensitivity to coefficients of k-? turbulence models

Autorzy:

Błazik-Borowa, E.

Powiązania:

https://bibliotekanauki.pl/articles/390264.pdf

Data publikacji:

2011

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

CFD
k-? turbulence models
sensitivity analysis
square cylinder

Opis:

The paper is devoted to the problem of boundary conditions influence on the quality of the solution obtained with use of k-? turbulence models. There are calculation results for different boundary conditions and two methods: standard k-? and RNG k-? in the paper. The flow parameters obtained from the calculation are compared with our own measurement results. Moreover, the influence of input data on the inflow edge on sensitivity coefficients is shown and analysed in the paper. The research is performed for components of velocity and turbulence kinetic energy.

Źródło:

Budownictwo i Architektura; 2011, 8, 1; 15-26
1899-0665

Pojawia się w:

Budownictwo i Architektura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Ocena przydatności wskaźników finansowych do prognozowania bankructwa przedsiębiorstw w zależności od rozmiaru obiektów

Autorzy:

Pawełek, Barbara
Pociecha, Józef
Baryła, Mateusz

Powiązania:

https://bibliotekanauki.pl/articles/581038.pdf

Data publikacji:

2018

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

ABC Analysis
bankructwo przedsiębiorstw
model prognostyczny
rozmiar przedsiębiorstwa
Sensitivity Analysis

Opis:

Celem pracy jest przedstawienie wyników badań empirycznych nad przydatnością wybranych wskaźników finansowych do prognozowania bankructwa przedsiębiorstw, w zależności od rozmiaru analizowanych obiektów. Wartością dodaną pracy jest propozycja zastosowania Sensitivity Analysis w połączeniu z ABC Analysis do oceny przydatności wskaźników finansowych do prognozowania bankructwa przedsiębiorstw. W analizie wykorzystano dane finansowe przedsiębiorstw z sektora przetwórstwa przemysłowego w Polsce z lat 2005-2008. Badaniem objęto takie metody, jak: drzewo klasyfikacyjne, bagging, boosting, lasy losowe. Modele były budowane na podstawie danych finansowych dotyczących zarówno wszystkich obiektów w rozważanym zbiorze, jak i obiektów zaklasyfikowanych do trzech podzbiorów uzyskanych dzięki ABC Analysis. Ocenę przydatności wybranych wskaźników finansowych do prognozowania bankructwa przedsiębiorstw przeprowadzono z wykorzystaniem algorytmu Data-based Sensitivity Analysis.

Źródło:

Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2018, 507; 191-199
1899-3192

Pojawia się w:

Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

On the robustness of optimal solutions for combinatorial optimization problems

Autorzy:

Libura, M.

Powiązania:

https://bibliotekanauki.pl/articles/969645.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

robustness analysis
sensitivity analysis
combinatorial optimization
accuracy function
robustness radius

Opis:

We consider the so-called generic combinatorial optimization problem, where the set of feasible solutions is some family of subsets of a finite ground set with specified positive initial weights of elements, and the objective function represents the total weight of elements of a feasible solution. We assume that the weights of all elements may be perturbed simultaneously and independently up to a given percentage of their initial values. A feasible solution which minimizes the worst-case relative regret, is called a robust solution. The maximum percentage level of perturbations, for which an initially optimal solution remains robust, is called the robustness radius of this solution. In this paper we study the robustness aspect of initially optimal solutions and provide lower bounds for their robustness radii.

Źródło:

Control and Cybernetics; 2009, 38, 3; 671-685
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Modelling of tissue thermal injury formation process with application of direct sensitivity method

Autorzy:

Jasiński, M.

Powiązania:

https://bibliotekanauki.pl/articles/280597.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

bioheat transfer
Arrhenius scheme
boundary element method
sensitivity analysis

Opis:

In the paper, numerical analysis of thermal processes proceeding in a biological tissue is presented. The tissue is subjected to the external heat impulse and a 2D problem is taken into account. In order to determine the influence of variations of thermophysical parameters of the tissue on the value of tissue injury integral and the area of the lesion, a direct approach of sensitivity analysis is applied. The process of thermal injury formation is also analyzed. At the stage of numerical simulation, the boundary element method is used. In the final part of the paper, an example of numerical simulation is shown.

Źródło:

Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 947-957
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Shape sensitivity analysis of elastic shells with cracs
Analiza wrażliwości kształtu podatnych powłok z pęknięciami

Autorzy:

Taroco, E.
Feijoo, R. A.

Powiązania:

https://bibliotekanauki.pl/articles/280946.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

shape sensitivity analysis
elastic shells
linear elastic fracture mechanics

Opis:

This study concerns the application of shape sensitivity analysis as a systematic methodology to determine the energy release rate of cracked shells, within the framework of a linear elastic approach that takes into account the effect of transverse shear deformation. This methodology and the direct method of shape sensitivity analysis is applied to shells with an arbitrary middle surface and leads to an explicit general expression for the shape sensitivity of the total potential strain energy. In elastic shells with cracks, crack initiation is simulated by a change of shape characterized by a suitable tangential velocity distribution over the middle surface of the shell. In this case, a useful expression of energy release rate is expressed in terms of the strain-stress state and the adopted shape change velocity field. Finally, shape sensitivity analysis is applied to the circular cylindrical shell and thus the condition of null divergence of the corresponding Eshelby tensor is verified.
Badania opisane w pracy dotyczą zastosowania analizy wrażliwości kształtu jako systematycznej metodologii wyznaczania tempa uwalnianej energii powłok z pęknięciami w ramach liniowego podejścia uwzględniającego efekt deformacji od ścinania poprzecznego. Ta metodologia i bezpośrednia analiza wrażliwości kształtu została zastosowana do powłok o dowolnej powierzchni środkowej, pozwalając na znalezienie jawnego i ogólnego wyrażenia na pochodną całkowitej energii odkształcenia. W podatnych powłokach z pęknięciami symulację inicjacji pęknięcia dokonano na podstawie zmiany kształtu określonej odpowiednim rozkładem prędkości powierzchni środkowej powłoki. W takim przypadku użyteczną formułę określającą tempo uwalnianej energii wyznaczono w funkcji stanu naprężenia i odkształcenia oraz zmian rozkładu pola prędkości powierzchni środkowej. Na koniec, analizę wrażliwości kształtu zastosowano do szczególnego przypadku powłoki cylindrycznej, gdzie warunek zerowej dywergencji odpowiadającego tensora Eshelby'ego został potwierdzony.

Źródło:

Journal of Theoretical and Applied Mechanics; 2003, 41, 3; 643-673
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Sensitivity of conti-casting process with respect to cooling conditions
Analiza wrażliwości procesu ciągłego odlewania na warunki chłodzenia wlewka

Autorzy:

Mochnacki, B.
Majchrzak, E.

Powiązania:

https://bibliotekanauki.pl/articles/281418.pdf

Data publikacji:

2002

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

continuous casting
solidification process
sensitivity analysis
boundary element method

Opis:

In the first part of this paper mathematical description of heat transfer processes proceeding in the domain of continuous casting is presented. The approach called the second generation modelling is taken into account. In particular, the capacity of a source function in the energy equation is determined by the nucleation and growth laws and the Johnson-Mehl-Avrami-Kolmogorow theory. Next, on the basis of the methods of sensitivity analysis the influence of cooling conditions of the cast slab surface on the course of solidification process is analyzed. At the stage of numerical computations the boundary element method has been used. In the final part of the paper an example of computations is presented.
W pierwszej części pracy przedstawiono opis matematyczny krzepnięcia wlewka ciągłego wytwarzanego z czystego matalu. Do opisu wykorzystano podeście nazywane modelem drugiej generacji. W szczególności, wydajność wewnętrznych źródeł ciepła będąca składnikiem równania energii jest wyznaczana na podstawie praw zarodkowania i wzrostu oraz teorii Johnsona-Mehla-Avrami-Kołomogorowa. Następnie, wykorzystując metodę bezpośrednią analizy wrażliwości, badano wpływ warunków chłodzenia powierzchni wlewka na proces jego krzepnięcia. Na etapie obliczeń numerycznych zastosowano metodę elementów brzegowych. W końcowej części pracy pokazano przykład obliczeń numerycznych.

Źródło:

Journal of Theoretical and Applied Mechanics; 2002, 40, 1; 129-147
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Application of sensitivity analysis to the correction of static characteristics of a phase angle modulator

Autorzy:

Sroka, R.

Powiązania:

https://bibliotekanauki.pl/articles/220462.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

phase modulator
sensitivity analysis
static characteristics
methods of correction

Opis:

The paper presents definitions and relative measures of the system sensitivity and sensitivity of its errors. The model of a real system and model of an ideal measuring system were introduced. It allows to determine the errors of the system. The paper presents also how to use the error sensitivity analysis carried out on the models of the measuring system to the correction of the nonlinearity error of its static characteristic. The corrective function is determined as a relation between the input variable of the tested system and its chosen parameter. The use of the proposed method has been presented on the example of a phase angle modulator. The obtained results have been compared with the results of analytic calculations. The idea of a phase angle modulator is also presented.

Źródło:

Metrology and Measurement Systems; 2011, 18, 2; 249-259
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Displacement monitoring and sensitivity analysis in the observational method

Autorzy:

Górska, K.
Muszyński, Z
Rybak, J.

Powiązania:

https://bibliotekanauki.pl/articles/178242.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

monitoring
metoda obserwacyjna
analiza wrażliwości
observation method
sensitivity analysis

Opis:

This work discusses the fundamentals of designing deep excavation support by means of observational method. The effective tools for optimum designing with the use of the observational method are both inclinometric and geodetic monitoring, which provide data for the systematically updated calibration of the numerical computational model. The analysis included methods for selecting data for the design (by choosing the basic random variables), as well as methods for an on-going verification of the results of numeric calculations (e.g., MES) by way of measuring the structure displacement using geodetic and inclinometric techniques. The presented example shows the sensitivity analysis of the calculation model for a cantilever wall in non-cohesive soil; that analysis makes it possible to select the data to be later subject to calibration. The paper presents the results of measurements of a sheet pile wall displacement, carried out by means of inclinometric method and, simultaneously, two geodetic methods, successively with the deepening of the excavation. This work includes also critical comments regarding the usefulness of the obtained data, as well as practical aspects of taking measurement in the conditions of on-going construction works.

Źródło:

Studia Geotechnica et Mechanica; 2013, 35, 3; 25-43
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Sensitivity analysis of grey linear programming for optimization problems

Autorzy:

Darvishi, Davood
Pourofoghi, Farid
Forrest, Jeffrey Yi-Lin

Powiązania:

https://bibliotekanauki.pl/articles/2100359.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

sensitivity analysis
uncertainty
interval grey number
grey linear programming

Opis:

Sensitivity analysis of parameters is usually more important than the optimal solution when it comes to linear programming. Nevertheless, in the analysis of traditional sensitivities for a coefficient, a range of changes is found to maintain the optimal solution. These changes can be functional constraints in the coefficients, such as good values or technical coefficients, of the objective function. When real-world problems are highly inaccurate due to limited data and limited information, the method of grey systems is used to perform the needed optimisation. Several algorithms for solving grey linear programming have been developed to entertain involved inaccuracies in the model parameters; these methods are complex and require much computational time. In this paper, the sensitivity of a series of grey linear programming problems is analysed by using the definitions and operators of grey numbers. Also, uncertainties in parameters are preserved in the solutions obtained from the sensitivity analysis. To evaluate the efficiency and importance of the developed method, an applied numerical example is solved.

Źródło:

Operations Research and Decisions; 2021, 31, 4; 35--52
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

A structural optimisation viewpoint on growth phenomena

Autorzy:

Barthold, F.

Powiązania:

https://bibliotekanauki.pl/articles/201312.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

computational mechanics
structural optimisation
sensitivity analysis
configurational mechanics
growth

Opis:

Evolutionary solid bodies undergoing changes of mass, of properties, and of shapes are considered in models of growth and adaptation and similarily in structural optimisation. A fundamental separation of different growth phenomena and a subsequent parametrisation using independent design variables for the amount of substance as well as for molar mass and molar volume facilitates an efficient formulation of the design space. Thus, the effects of design variations, i.e. change of amount of substance, on the variations of the structural response, i.e. the deformation in physical space, can be clearly described. Overall, a novel treatment of growth processes based on an evolution of the amount of substance is outlined. The parallelism of variations in physical and design space are highlighted and compared with the multiplicative decomposition of the deformation gradient into a growth and an elastic part incorporating an incompatible intermediate configuration. This drawback is overcome by a compatible manifold based on material points modelling the amount of substance outside of any geometrical space.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 247-252
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Analysis and design of thermo-mechanical interfaces

Autorzy:

Dems, K.
Mroz, Z.

Powiązania:

https://bibliotekanauki.pl/articles/202338.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

multiphase structures
sensitivity analysis
optimization
heat transfer
thermo-elasticity

Opis:

An elastic structure subjected to thermal and mechanical loading with prescribed external boundary and varying internal interface is considered. The different thermal and mechanical nature of this interface is discussed, since the interface form and its properties affect strongly the structural response. The first-order sensitivities of an arbitrary thermal and mechanical behavioral functional with respect to shape and material properties of the interface are derived using the direct or adjoint approaches. Next the relevant optimality conditions are formulated. Some examples illustrate the applicability of proposed approach to control the structural response due to applied thermal and mechanical loads.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 205-213
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Sensitivity analysis of the dem model numerical parameters on the value of the angle of repose of lunar regolith analogs

Autorzy:

Młynarczyk, Przemysław
Kolusz, Adam
Gallina, Alberto

Powiązania:

https://bibliotekanauki.pl/articles/27314470.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Centrum Badań Kosmicznych PAN

Tematy:

DEM
regolith
space mining
repose angle test
sensitivity analysis

Opis:

The discrete element method (DEM) is a numerical technique used in many areas of modern science to describe the behavior of bulk materials. Terramechanics of planetary soil analogs for in situ resource utilization activities is a research field where the use of DEM appears to be beneficial. Indeed, the close-to-physics modeling approach of DEM allows the researcher to gain much insight into the mechanical behavior of the regolith when it interacts with external devices in conditions that are hard to test experimentally. Nevertheless, DEM models are very difficult to calibrate due to their high complexity. In this paper, we study the influence of fundamental model parameters on specific simulation outcomes. We provide qualitative and quantitative assessments of the influence of DEM model parameters on the simulated repose angle and computational time. These results help to understand the behavior of the numerical model and are useful in the model calibration process.

Źródło:

Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, Special Issue 1; 188--202
2083-6104

Pojawia się w:

Artificial Satellites. Journal of Planetary Geodesy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Modelling and optimation of transmission system with an asynchronous motor
Modelowanie i optymalizacja układów napędowych z silnikami asynchronicznymi

Autorzy:

Mężyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/281127.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

mathematical model
gear train
electromechanical system
sensitivity analysis
optimization

Opis:

Mathematical models of an electromechanical system with an induction motor are dealt with in the paper. An electric motor model is described in the equivalent axial coordinate system (x, y). The mathematical model of the gear train has been formulated by means of a hybrid method of rigid and deformable finite elements. Special attention has been paid to problems of modelling of planetery gears. The sensitivity analysis and optimization have been carried out using an objective function describing the maximal forces in kinematic pairs. The applied algorithm of direct differentiation makes it possible to examine the influence of parameters of the electromechanical model on the dynamic phenomena occuring in the system. From the performed investigations it appears that, when modelling the mechanisms under consideration, it is necessary to take electromechanical couplings into account.
W pracy omówiono sposób modelowania elektromechanicznych układów napędowych z silnikami indukcyjnymi. Model silnika elektrycznego opisano w zastępczym układzie współrzędnych (x, y). Model matematyczny przekładni zębatej opracowano z wykorzystaniem hybrydowej metody sztywnych i odkształcalnych elementów skończonych. Szczególną uwagę zwrócono na modelowanie przekładni planetarnej. Analizę wrażliwości i optymalizację przeprowadzono dla funkcji celu opisującej wartości maksymalne sił dynamicznych. Zaprezentowana metoda bezpośredniego różniczkowania umożliwia określenie wpływu parametrów silnika napędowego na zjawiska dynamiczne w części mechanicznej.

Źródło:

Journal of Theoretical and Applied Mechanics; 2003, 41, 1; 169-197
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

The sensitivity of state differential game vessel traffic model

Autorzy:

Lisowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/259067.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine transport
safety of navigation
game control
sensitivity analysis

Opis:

The paper presents the application of the theory of deterministic sensitivity control systems for sensitivity analysis implemented to game control systems of moving objects, such as ships, airplanes and cars. The sensitivity of parametric model of game ship control process in collision situations have been presented. First-order and k-th order sensitivity functions of parametric model of process control are described. The structure of the game ship control system in collision situations and the mathematical model of game control process in the form of state equations, are given. Characteristics of sensitivity functions of the game ship control process model on the basis of computer simulation in Matlab/Simulink software have been presented. In the end , have been given proposals regarding the use of sensitivity analysis to practical synthesis of computer-aided system navigator in potential collision situations.

Źródło:

Polish Maritime Research; 2016, 2; 14-18
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Sensitivity Analysis of the Estimation of the Single-Number Sound Absorption Evaluation Index DLα

Autorzy:

Batko, W.
Pawlik, P.
Wszołek, G.

Powiązania:

https://bibliotekanauki.pl/articles/176445.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sensitivity analysis
acoustic barriers
interval arithmetic
Monte Carlo method

Opis:

Acoustic barriers are assigned to the respective categories of sound absorbing properties on the basis of a single-number sound absorption evaluation index. Categories of absorbing properties play a significant role in selecting the barrier type for the given localisation. The estimation of the single-number sound absorption evaluation index is performed, among others, by means of measuring the sound absorption coefficient of the analysed acoustic barrier sample in the reverberation chamber. The sensitivity analysis of the determination of the single-number sound absorption evaluation index was performed in this work. The estimation of the input parameters uncertainty contribution to the expanded uncertainty of the sound absorption evaluation index, was done first. The Monte Carlo method and the reduction interval arithmetic were used for this aim. The relative sensitivity coefficients were determined by means of the author’s method based on the interval arithmetic. These coefficients contain information concerning the quantitative influence of the given input value on the final result.

Źródło:

Archives of Acoustics; 2017, 42, 4; 689-696
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Generalized J-integral method for sensitivity analysis of static shape design

Autorzy:

Ohtsuka, K.
Chludnev, A.

Powiązania:

https://bibliotekanauki.pl/articles/205915.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

derivative of energy functional
domain perturbation
GJ-integral
sensitivity analysis

Opis:

The paper analyses the concept of GJ-integral. This concept is linked with the derivative of the energy functional with respect to a general perturbation of the domain and it is useful in studying many problems of sensitivity analysis. Applications of the GJ-integral method to numerous linear and nonlinear problems are indicated.

Źródło:

Control and Cybernetics; 2000, 29, 2; 513-533
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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