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Wyświetlanie 1-15 z 79
Tytuł:
Flexible lighting distribution on “party ships”
Autorzy:
Mayer, O.
Powiązania:
https://bibliotekanauki.pl/articles/134922.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
TRIZ
TIPS
trimming
function analysis
FOS
trends
IFR
resources
Opis:
TRIZ trends predict an increased electrification of engineering systems. One of the visible effects of this is lighting, in this case party lights on boats. The need to furnish a boat with colorful illumination requires a flexible, redispatchable system. Cable-bound illumination does not meet this requirement. A solution is presented in this paper using TRIZ as a problem-solving methodology. TRIZ comprises a set of heuristic tools for problem analysis, reformulation, root cause analysis, and problem-solving algorithms. TRIZ, however, concentrates on generating solutions to problems irrespective of given limitations concerning, for example, safety, producibility, or cost. TRIZ provides a direction of thinking that has been proven successful in the past for similar problems. Other tools must, nevertheless, be used to carry out a technical evaluation of the feasibility of the solution, scalability, practicability, or cost target. TRIZ tools are widely used by engineers in multinational corporations such as Intel, GE, Philips, Siemens, Bosch, Boeing, Samsung, LG, and Cochlear. In this paper, selected tools from the overall TRIZ toolbox will be used and explained, with a focus on functional analysis, trimming, and resources. However, other aspects (Trends, Function Oriented Search (FOS), and Ideal Final Result (IFR)) will also be presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 9-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mutational analysis of the AtNUDT7 Nudix hydrolase from Arabidopsis thaliana reveals residues required for protein quarternary structure formation and activity
Autorzy:
Olejnik, Kamil
Płochocka, Danuta
Grynberg, Marcin
Goch, Grażyna
Gruszecki, Wiesław
Basińska, Teresa
Kraszewska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/1040587.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
dimer
Nudix
structure-function analysis
mutagenesis
AtNUDT7
Arabidopsis thaliana
14.3.3 interaction
biophysical analysis
Opis:
Arabidopsis thaliana AtNUDT7, a homodimeric Nudix hydrolase active on ADP-ribose and NADH, exerts negative control on the major signaling complex involved in plant defense activation and programmed cell death. The structural and functional consequences of altering several amino-acid residues of the AtNUDT7 protein have been examined by site-directed mutagenesis, far-UV circular dichroism (CD), attenuated total reflection-Fourier transform infrared (ATR-FTIR) and photon correlation (PCS) spectroscopy, biochemical analysis and protein-protein interaction studies. Alanine substitutions of F73 and V168 disallowed dimer formation. Both the F73A- and V168A-mutated proteins displayed no observable enzymatic activity. Alanine substitution of the V69 residue did not significantly alter the enzyme activity and had no influence on dimer arrangement. The non-conserved V26 residue, used as a negative control, did not contribute to the enzyme quaternary structure or activity. Detailed biophysical characterization of the wild-type and mutant proteins indicates that the mutations do not considerably alter the secondary structure of the enzyme but they affect dimer assembly. In addition, mutating residues V69, F73 and V168 disrupted the binding of AtNUDT7 to the regulatory 14.3.3 protein. These are the first studies of the structure-function relationship of AtNUDT7, a Nudix hydrolase of important regulatory function.
Źródło:
Acta Biochimica Polonica; 2009, 56, 2; 291-300
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Predictors of the Consequences of Secondary Exposure to Trauma Among Professionals Working With Trauma Victims
Autorzy:
Juczyński, Zygfryd
Ogińska-Bulik, Nina
Powiązania:
https://bibliotekanauki.pl/articles/31343460.pdf
Data publikacji:
2023
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
secondary traumatic stress
secondary posttraumatic growth
core beliefs
cognitive processing of trauma
discriminant function analysis
Opis:
Helping those who have experienced trauma exposes the helpers to secondary traumatization. The mechanisms of its development are most often explained using the cognitive model of trauma processing. The aim of the research is to determine how disturbances of core beliefs and cognitive processing in the form of coping with stress are associated with secondary traumatic stress (STS) and secondary posttraumatic growth (SPTG). The study was conducted among psychologists and social workers (N = 240), working with people after traumatic experiences. Four standardized measurement tools were used. Based on the differential diagnosis, four types of consequences were identified. Discriminant analysis was used to establish the optimal configuration of predictors explaining the differences between the four subgroups. Two significant discriminant functions were significant, each identifies different beliefs and coping strategies. The first is associated with the disruptions of core beliefs about the world and cognitive processing in the form of a non-adaptive strategy; the second—with disturbed beliefs about oneself and adaptation strategies. Our results show a much greater exposure of social workers to the negative consequences of secondary traumatic stress disorder. A system of constant monitoring should be introduced, and the principles of prevention and therapy should be implemented.
Źródło:
Roczniki Psychologiczne; 2023, 26, 3; 241-260
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of technical efficiency by application of the SFA method for panel data
Autorzy:
Bezat, A.
Powiązania:
https://bibliotekanauki.pl/articles/573024.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
efficiency
stochastic frontier analysis
Cobb-Douglas function
translog function
analysis method
business firm
technical efficiency
frontier production function
Opis:
Estimation of the technical efficiency which measures the ability of a company to obtain the maximum output from given inputs or to use the minimum input to achieve given outputs has been considered. Stochastic methods were chosen because of their wide application in research in the whole world. The Translog and Cobb-Douglas stochastic frontiers were fitted in order to estimate the efficiency of milling companies in Poland.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2011, 11(26), 3
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
On the classification of observations in the switching regression
O klasyfikacji obserwacji w regresji przełącznikowej
Autorzy:
Pruska, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/904610.pdf
Data publikacji:
1997
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
switching regression model
discrimination analysis
loss function
Opis:
The paper discusses the method of determining the sample division indicator for the switching regression model in case of two states generating values of the explained variable, which ensures the least risk of making a mistake, understood as the expected value of relevant loss function. This paper is an attempt to take advantage of the discrimination analysis elements in the switching regression analysis.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 1997, 141
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The hazard function and its role in a non-parametric duration analysis of enterprises in the Łódzkie Voivodeship
Autorzy:
Mikulec, Artur
Powiązania:
https://bibliotekanauki.pl/articles/424857.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
enterprises
duration analysis
hazard function
cumulative hazard function
mean absolute percentage error
Opis:
In a duration analysis of enterprises, as a rule there are determined four basic functions related to the time of their duration, i.e.: the density function; the distribution function; the survival function, and the hazard function. It turns out that the hazard function and its cumulative version are the key to understanding modern survival analysis. The aim of the paper is to indicate the best method of the estimation of the values of individual functions in survival analysis based on other functions. The paper provides compiled and classified information on particular functions used in the non-parametric duration analysis of enterprises. It examines some theoretical and practical problems related to the determination of, among others, the hazard function and the cumulative hazard function on the basis of data in cohort tables and the results of the estimation of the survival function with the use of the Kaplan- Meier method. The considerations included in the paper are illustrated with the results of analyses for enterprises established in the Łódzkie Voivodeship in 2001-2015 (including those which went into liquidation).
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2019, 23, 3; 59-75
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Second Wave of the COVID-19 Pandemic in Poland - Characterised Using FDA Methods
Druga fala COVID-19 w Polsce - charakterystyka z zastosowaniem metod FDA
Autorzy:
Hęćka, Patrycja
Powiązania:
https://bibliotekanauki.pl/articles/21375673.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
function-on-function regression
functional data analysis (FDA)
COVID-19
functional principal component analysis
smooth functions
regresja function-on-function
analiza danych funkcjonalnych
analiza głównych składowych funkcjonalnych
funkcje gładkie
Opis:
The aim of this article was to analyse functional data of the number of hospitalised individuals, intensive care patients, positive COVID-19 tests, deaths and convalescents during the second wave of the COVID-19 pandemic in Poland. For this purpose, firstly the author convert data of sixteen voivodeships to smooth functions, and then used the principal component analysis and multiple function-on-function linear regression model to predict the number of hospitalised and intensive care patients due to the COVID-19 infection during the second wave of the pandemic. Finally, the results were compared with those previously obtained for the combined data of the second and third wave of the COVID-19 pandemic in Poland (Hęćka, 2023).
Głównym celem artykułu była analiza danych funkcjonalnych dotyczących liczby pozytywnych wyników testu, zgonów, ozdrowieńców, osób hospitalizowanych oraz w stanie ciężkim podczas drugiej fali pandemii COVID-19 w Polsce. Pierwszym krokiem była konwersja danych w funkcje gładkie. Następnie przedstawiono analizę głównych składowych funkcjonalnych oraz użycie modelu multiple function-on-function linear regression w celu predykcji liczby osób hospitalizowanych oraz będących w stanie ciężkim z powodu COVID-19 w polskich województwach. Otrzymane wyniki porównano z wcześniej uzyskanymi dla połączonych danych z drugiej i trzeciej fali pandemii.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2023, 27, 3; 20-34
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bifurcation and Stability Analysis of the Dynamics of Gonorrhea Disease in the Population
Autorzy:
Adediipo, Adeola D.
Akanni, John O.
Shangodare, Olasunkanmi M.
Powiązania:
https://bibliotekanauki.pl/articles/1030149.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Basic Reproduction Number
Bifurcation analysis
Gonorrhea disease
Lyapunov function
Sensitivity analysis
Stability Analysis
Opis:
The model was governed by a system of ordinary differential equations; the population into susceptible individuals (S), Exposed individuals (E), infected individuals (I) and Recovered individuals (Q). Theory of positivity and boundedness was used to investigate the well-posedness of the model. Equilibrium solutions were investigated analytically. The basic reproduction number (R0) were calculated using the next generation operator method. Bifurcation analysis and global stability of the model were carried out using centre manifold theory and Lyapunov functions respectively. The effects of parameters such as efficacy of Condom (κ), Effective Contact Rate (β), Compliance of Condom (θ), Progression Rate (ρ) and Treatment Rate (α) on R0 were explored through sensitivity analysis. The possibility of mitigating the spread of gonorrhea in the population has been studied. It can be concluded that parameters representing efficacy of Condom, Effective Contact Rate, Compliance of Condom, Progression Rate and Treatment Rate are significant in reducing the burden of gonorrhea disease in the population.
Źródło:
World Scientific News; 2020, 143; 139-154
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supporting decisions on the Forex market using fuzzy approach
Autorzy:
Juszczuk, Przemysław
Kruś, Lech
Powiązania:
https://bibliotekanauki.pl/articles/384399.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
trading system
Forex
fuzzy membership function
multicriteria analysis
Opis:
A new concept of the multicriteria fuzzy trading system using the technical analysis is proposed. The existing trading systems use different indicators of the technical analysis and generate buy or sell signal only when assumed conditions for a given indicator are satisfied. The information presented to the trader – decision maker is binary. The decision maker obtains a signal or no. In comparison to the existing traditional systems called as crisp, the proposed system treats all considered indicators jointly using the multicriteria approach and the binary information is extended with the use of the fuzzy approach. Currency pairs are considered as variants in the multicriteria space in which criteria refer to different technical indicators. The introduced domination relation allows generating the most efficient, non‐dominated (Pareto optimal) variants in the space. An algorithm generated these non-dominated variants is proposed. It is implemented in a computer‐based system assuring the sovereignty of the decision maker. We compare the proposed system with the traditional crisp trading system. It is made experimentally on different sets of real‐world data for three different types of trading: short‐term, medium and long‐term trading. The achieved results show the computational efficiency of the proposed system. The proposed approach is more robust and flexible than the traditional crisp approach. The set of variants derived for the decision maker in the case of the proposed approach includes only non‐dominated variants, what is not possible in the case of the traditional crisp approach. The reservation point and its impact on the overall results are measured with the use of the sensitivity analysis.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 50-62
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability analysis method of coupling optimal importance sampling density and multi-fidelity Kriging model
Autorzy:
Xie, Jiayu
Tian, Zongrui
Zhi, Pengpeng
Zhao, Yadong
Powiązania:
https://bibliotekanauki.pl/articles/24200829.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reliability analysis
multifidelity model
learning function
stopping condition
Opis:
The commonly used reliability analysis approaches for Kriging-based models are usually conducted based on high-fidelity Kriging models. However, high-fidelity surrogate models are commonly costly. Therefore, in order to balance the calculation expense and calculation time of the surrogate model, this paper proposes a multi-fidelity Kriging model reliability analysis approach with coupled optimal important sampling density (OISD+MFK). First, the MEI learning function is proposed considering the training sample distance, model computation cost, expected improvement function, and model relevance. Second, a dynamic stopping condition is proposed that takes into account the failure probability estimation error. Finally, the optimal importance sampling density is incorporated into the reliability analysis process, which can effectively reduce failure probability estimation error. The results of the study show that the approach proposed in this paper can reduce the calculation cost while outputting relatively accurate failure probability evaluation results.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 2; art. no. 161893
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental modal analysis in research
Autorzy:
Żółtowski, M.
Napieraj, K.
Powiązania:
https://bibliotekanauki.pl/articles/390979.pdf
Data publikacji:
2017
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
experimental modal analysis
FRF function
vibration modes
testing
Opis:
Experimental modal analysis has grown steadily in popularity since the advent of the digital FFT spectrum analyser in the 1970’s. This days impact testing has become widespread as a fast and economical means of finding the vibration modes of a machine or structure. Its significantly use ascending roles can be seen also in the civil engineering industry [6]. This paper reviews the main topics associated with experimental modal analysis including making FRF measurements, modal excitation techniques, and modal parameter estimation from a set of FRFs.
Źródło:
Budownictwo i Architektura; 2017, 16, 3; 5-12
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trajectory tracking and collision avoidance for the formation of two-wheeled mobile robots
Autorzy:
Kowalczyk, W.
Kozłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/200897.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
robot formation
nonholonomic robot
stability analysis
Lyapunov-like function
path following
artificial potential function
Opis:
This paper presents control method for multiple two-wheeled mobile robots moving in formation. Trajectory tracking algorithm from [7] is extended by collision avoidance, and is applied to the different type of formation task: each robot in the formation mimics motion of the virtual leader with a certain displacement. Each robot avoids collisions with other robots and circular shaped, static obstacles existing in the environment. Artificial potential functions are used to generate repulsive component of the control. Stability analysis of the closed-loop system is based on Lyapunov-like function. Effectiveness of the proposed algorithm is illustrated by simulation results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 915-924
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of engineering/physical dynamic systems using residual energy function
Autorzy:
Civelek, C.
Powiązania:
https://bibliotekanauki.pl/articles/229956.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stability analysis
residual energy function as Lyapunov function
physical dynamic systems
coupled engineering systems
Opis:
In this article, an engineering/physical dynamic system including losses is analyzed inrelation to the stability from an engineer’s/physicist’s point of view. Firstly, conditions for a Hamiltonian to be an energy function, time independent or not, is explained herein. To analyze stability of engineering system, Lyapunov-like energy function, called residual energy function is used. The residual function may contain, apart from external energies, negative losses as well. This function includes the sum of potential and kinetic energies, which are special forms and ready-made (weak) Lyapunov functions, and loss of energies (positive and/or negative) of a system described in different forms using tensorial variables. As the Lypunov function, residual energy function is defined as Hamiltonian energy function plus loss of energies and then associated weak and strong stability are proved through the first time-derivative of residual energy function. It is demonstrated how the stability analysis can be performed using the residual energy functions in different formulations and in generalized motion space when available. This novel approach is applied to RLC circuit, AC equivalent circuit of Gunn diode oscillator for autonomous, and a coupled (electromechanical) example for nonautonomous case. In the nonautonomous case, the stability criteria can not be proven for one type of formulation, however, it can be proven in the other type formulation.
Źródło:
Archives of Control Sciences; 2018, 28, 2; 201-222
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Outlier detection based on the functional coefficient of variation
Autorzy:
Deveci Kocakoç, Ipek
Köymen Keser, Istem
Powiązania:
https://bibliotekanauki.pl/articles/12289238.pdf
Data publikacji:
2023-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
coefficient of variation function
outlier detection
functional data analysis
Opis:
The coefficient of the variation function is a useful descriptive statistic, especially when comparing the variability of more than two curve groups, even when they have significantly different mean curves. Since the coefficient of variation function is the ratio of the mean and standard deviation functions, its particular property is that it shows the acceleration more explicitly than the standard deviation function. The aim of the study is twofold: to show that the functional coefficient of variation is more sensitive to abrupt changes than the functional standard deviation and to propose the utilisation of the functional coefficient of variation as an outlier detection tool. Several simulation trials have shown that the coefficient of the variation function allows the effects of outliers to be seen explicitly.
Źródło:
Statistics in Transition new series; 2023, 24, 2; 1-16
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 79

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