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Wyświetlanie 1-15 z 205
Tytuł:
A comparative study of the fuzzy linear model and the DEA in evaluation of efficiency of the DMUs
Autorzy:
Uemura, Y.
Powiązania:
https://bibliotekanauki.pl/articles/206862.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
model liniowy rozmyty
BCC model
DEA
fuzzy log-linear model
possibility production set
Opis:
Evaluation of efficiency for every DMU (Decision Making Unit) in a company is a very important issue. Thus, the studies of evaluation of efficiency are being actively carried out on the basis of production functions. Until now, loglinear production function (Cobb-Douglas model) has been used for evaluation. This loglinear model evaluates DMUs by measuring the average. Recently, DEA (Data Envelopment Analysis) has been applied as the available method involving, for example, the CCR (Charnes-Cooper-Rhodes) and BCC (Banker-Charnes-Cooper) models. However, the IDEA models do not have the lower limit on the production set, but only the upper limit. Since, however, we consider that the real problems have the production set extending from the lower limit to the upper limit, we propose the possibility production function obtained by introducing the fuzziness into the loglinear production function. As we try to evaluate the efficiency by this possibility production function we can obtain two efficiency ratings: for the upper and lower limits. Though both DEA and fuzzy loglinear model include all the DMU data, in the DEA approach we obtain the lower limit on inputs for the given output, while in the fuzzy loglinear approach we obtain the possibility maximum output for the given inputs. By making full use of the difference between the two approaches, we try to compare the DEA and the fuzzy loglinear model in the evaluation of efficiency of the DMUs. In terms of two efficiency ratings, fuzzy loglinear model can yield more exact ranking for every DMU than DEA. Genarally, when a DMU has efficiency less that 1 by fuzzy loglinear analysis, it means that there is a possibility of obtaining larger output for the given inputs.
Źródło:
Control and Cybernetics; 1998, 27, 3; 471-477
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparison of Small Area Estimation Methods for Poverty Mapping
Autorzy:
Guadarrama, María
Molina, Isabel
Rao, J. N. K.
Powiązania:
https://bibliotekanauki.pl/articles/465671.pdf
Data publikacji:
2016
Wydawca:
Główny Urząd Statystyczny
Tematy:
area level model
non-linear parameters
empirical best estimator
hierarchical Bayes
poverty mapping
unit level models
Opis:
We review main small area estimation methods for the estimation of general nonlinear parameters focusing on FGT family of poverty indicators introduced by Foster, Greer and Thorbecke (1984). In particular, we consider direct estimation, the Fay-Herriot area level model (Fay and Herriot, 1979), the method of Elbers, Lanjouw and Lanjouw (2003) used by the World Bank, the empirical Best/Bayes (EB) method of Molina and Rao (2010) and its extension, the Census EB, and finally the hierarchical Bayes proposal of Molina, Nandram and Rao (2014). We put ourselves in the point of view of a practitioner and discuss, as objectively as possible, the benefits and drawbacks of each method, illustrating some of them through simulation studies.
Źródło:
Statistics in Transition new series; 2016, 17, 1; 41-66
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A developed nonlinear model for the location-allocation and transportation problems in a cross-docking distribution network
Autorzy:
Nasrollahi, Saeid
Hosseini-Nasab, Hasan
Fakhrzad, Mohamad Bagher
Honarvar, Mahboobeh
Powiązania:
https://bibliotekanauki.pl/articles/2175835.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cross-docking
location-allocation
transportation problem
mixed-integer non-linear model
consolidation
Opis:
The paper addresses the location-allocation and transportation problems in designing a cross-docking distribution network that consists of suppliers, cross-docks, and plants. A developed mixed-integer non- -linear model is proposed for a post-distribution cross-docking strategy with multiple cross-docks and products that cross-docks can be connected. The objective function is to minimise the total cost comprising the cost of established cross-docks and transportation costs. To obtain this model, first, two models are introduced and compared (basic non-linear model 1 and non-linear model 2 with the possibility of connections between cross-docks). Results indicate that the total cost is decreased when the connection between cross-docks exists. So, model 2 is more efficient and suitable than model 1. Then, consolidation of plant orders is added to model 2, and the developed model is formulated. Finally, some problems with different sizes are generated randomly and solved by GAMS software to evaluate the model accuracy.
Źródło:
Operations Research and Decisions; 2022, 32, 1; 127--148
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A discrete model for geometrically nonlinear free and forced vibrations of stepped and continuously segmented Euler-Bernoulli AFG beams (SAFGB) carrying point masses
Autorzy:
Moukhliss, Anass
Rahmouni, Abdellatif
Bouksour, Othman
Benamar, Rhali
Powiązania:
https://bibliotekanauki.pl/articles/2146732.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
discrete model
stepped beam
free non-linear vibration
forced nonlinear vibration
AFG beam
point mass
model dyskretny
belka o skokowo zmiennym przekroju
drgania swobodne
drgania wymuszone
drgania nieliniowe
Opis:
A discrete model is applied to handle the geometrically nonlinear free and forced vibrations of beams consisting of several different segments whose mechanical characteristics vary in the length direction and contain multiple point masses located at different positions. The beam is presented by an N degree of freedom system (N-Dof). An approach based on Hamilton's principle and spectral analysis is applied, leading to a nonlinear algebraic system. A change of basis from the displacement basis to the modal basis has been performed. The mechanical behavior of the N-Dof system is described in terms of the mass tensor mij, the linear stiffness tensor kij, and the nonlinear stiffness tensor bijkl. The nonlinear vibration frequencies as functions of the amplitude of the associated vibrations in the free and forced cases are predicted using the single mode approach. Once the formulation is established, several applications are considered in this study. Different parameters control the frequency-amplitude dependence curve: the laws that describe the variation of the mechanical properties along the beam length, the number of added masses, the magnitude of excitation force, and so on. Comparisons are made to show the reliability and applicability of this model to non-uniform and non-homogeneous beams in free and forced cases.
Źródło:
Diagnostyka; 2022, 23, 4; art no 2022401
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A dominant height growth model for eucalyptus plantations in Portugal
Autorzy:
Mateus, Ayana
Tomé, Margarida
Powiązania:
https://bibliotekanauki.pl/articles/729682.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
algebraic difference equation
dynamic model
dominant height
forest planning
non linear model
Opis:
Eucalyptus globulus Labill is one of the most important economic forest species in Portugal, occupying an area of 875.10³ ha in a total forest area of 3346.10³ ha (Tomé et al., 2007). The main goal of this study is to develop a dominant height growth model for Eucalyptus, applicable throughout the country, representing an improve of the curves that are part of the whole stand model existing in Portugal, the GLOBULUS model (Tomé et al., 2001). The dominant height growth model will be built on a biological function formulated as a difference equation (Algebraic Difference Approach) to an all possible growth intervals data structure. The dynamic model proposed, obtains non biased and efficient estimates for the parameters. Comparing to the already available model, the last has the advantage of expressing the asymptote in weather variables functions, meaning that it is possible to reproduce the eucalyptus growth according to weather changes.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2009, 29, 2; 155-168
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A geometric approach to structural model matching by output feedback in linear impulsive systems
Autorzy:
Zattoni, E.
Powiązania:
https://bibliotekanauki.pl/articles/330301.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
linear impulsive system
hybrid system
model matching
disturbance decoupling
geometric approach
structural properties
układ liniowy impulsowy
układ hybrydowy
dopasowanie modelu
właściwości strukturalne
Opis:
This paper provides a complete characterization of solvability of the problem of structural model matching by output feedback in linear impulsive systems with nonuniformly spaced state jumps. Namely, given a linear impulsive plant and a linear impulsive model, both subject to sequences of state jumps which are assumed to be simultaneous and measurable, the problem consists in finding a linear impulsive compensator that achieves exact matching between the respective forced responses of the linear impulsive plant and of the linear impulsive model, by means of a dynamic feedback of the plant output, for all the admissible input functions and for all the admissible sequences of jump times. The solution of the stated problem is achieved by reducing it to an equivalent problem of structural disturbance decoupling by dynamic feedforward. Indeed, this latter problem is formulated for the so-called extended linear impulsive system, which consists of a suitable connection between the given plant and a modified model. A necessary and sufficient condition for the solution of the structural disturbance decoupling problem is first shown. The proof of sufficiency is constructive, since it is based on the synthesis of the compensator that solves the problem. The proof of necessity is based on the definition and the geometric properties of the unobservable subspace of a linear impulsive system subject to unequally spaced state jumps. Finally, the equivalence between the two structural problems is formally established and proven.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 25-38
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Linear Model for Uniformity Trial Experiments
Autorzy:
Shukla, Alok K.
Yadav, Subhash K.
Misra, Govind Ch.
Powiązania:
https://bibliotekanauki.pl/articles/465826.pdf
Data publikacji:
2013
Wydawca:
Główny Urząd Statystyczny
Tematy:
Fairfield Smith’s Variance Law
linear model
uniformity trial experiments
Opis:
Uniformity trial experiments are required to assess fertility variation in agricultural land. Several models have appeared in literature, of which Fairfield Smith’s Variance Law assuming a nonlinear relationship between the coefficient of variation (C.V.) and a plot size has been extensively used in uniformity trial studies. A linear model has been proposed for uniformity trial experiments and it has shown better results as compared to existing models. The expression for point of maximum curvature for the proposed model is much simpler as compared to the model of Fairfield Smith. The appropriateness of the proposed model has also been verified with the help of a data set.
Źródło:
Statistics in Transition new series; 2013, 14, 1; 161-170
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-product and multi-period facility location model for reverse logistics
Model lokalizacji wieloasortymentowej i wielookresowej w logistyce odwrotnej
Autorzy:
Benaissa, M.
Benabdelhafid, A.
Powiązania:
https://bibliotekanauki.pl/articles/405845.pdf
Data publikacji:
2010
Wydawca:
Politechnika Częstochowska
Tematy:
logistyka odwrotna
lokalizacja obiektu
końcowe życie produktu
problem lokalizacji
model liniowego programowania mieszanego
reverse logistics
facility location
end of life product
location problem
mixed linear program model
Opis:
Reverse logistics has become an important entity in the world economy. Businesses increasingly have to cope with product returns, mandated environmental regulations and increasing costs associated with product disposal. This study presents a cost-minimization model for a multi-time-step, multi-type product waste reverse logistics system. The facility location is a central issue of the logistics networks. In this article we are interested in optimizing of the sites facility location for a reverse logistics network for product end of life. Specifically, we present a Mixed Linear Program model for the strategic problem of collection sites facility location, cannibalization and recycling. This model allows determining to open or to close the sites previously in the reverse logistics network. All of these decisions are to minimize the costs of end of life product returns at various time periods considered in the planning. To solve the mathematical program, we have used the evaluation process and separation implemented in CPLEX commercial solver.
Logistyka odwrotna stała się bardzo ważnym elementem świata ekonomii. Przedsiębiorstwa coraz częściej muszą radzić sobie ze zwrotami produktów, obowiązującymi przepisami dotyczącymi środowiska oraz rosnącymi kosztami usuwania wyrobu. W artykule zaprezentowano model minimalizacji kosztów dla systemu wielu kroków czasowych usuwania wielu typów produktów w logistce odwrotnej. Problem lokalizacji jest główną kwestią sieci logistycznych. W niniejszej pracy skupiono się przede wszystkim na optymalizacji miejsc lokalizacji w sieciach logistyki odwrotnej w przypadku końcowego życia produktu. Zaprezentowano model Liniowego Programowania Mieszanego w strategicznym problemie lokalizacji w miejscu zbierania odpadów, kanibalizacji i recyclingu. Ten model umożliwia określenie wcześniejszego otwarcia lub zamknięcia miejsc zbierania odpadów w sieci logistyki odwrotnej. Celem tych decyzji jest minimalizacja kosztów końcowego życia zwrotu wyrobu w różnych okresach czasu na etapie planowania. Aby rozwiązać ten problem matematyczny zastosowano proces oceny i separacji zaimplementowany w komercyjnym solverze CPLEX.
Źródło:
Polish Journal of Management Studies; 2010, 2; 7-19
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new elliptical model of the vocal tract
Autorzy:
Kobus, A.
Kuniszyk-Jóźkowiak, W.
Smołka, E.
Suszyński, W.
Codello, I.
Powiązania:
https://bibliotekanauki.pl/articles/333373.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
model eliptyczny
aparat głosowy
przewidywania liniowe
jąkanie
elliptical model
vocal tract
PARCOR
linear prediction
disfluency
stuttering
Opis:
In this paper a new model of the vocal tract is proposed. It is based on elliptical cylinders. It uses the vocal tract model based on PARCOR coefficients and midsaggital measurements of the voice tube. PARCOR coefficients were obtained from linear prediction coefficients which had been obtained by Levinson-Durbin method. Midsaggital lengths, understood as the height of a real vocal tract, were taken from X-Ray pictures, and they were averaged from the vocal tracts of a few people, who uttered the same vowels. The paper bases on Polish vowels: a,e,o,u,i,y.
Źródło:
Journal of Medical Informatics & Technologies; 2011, 17; 131-139
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new fuzzy Lyapunov approach to non-quadratic stabilization of Takagi-Sugeno fuzzy models
Autorzy:
Abdelmalek, I.
Goléa, N.
Hadjili, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/911242.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
liniowe nierówności macierzowe
stabilizacja
funkcja Lapunowa
model Takagi-Sugeno
system rozmyty
T-S fuzzy systems
non-quadratic stability conditions
linear matrix inequalities
parallel distributed compensation
stabilization
Opis:
In this paper, new non-quadratic stability conditions are derived based on the parallel distributed compensation scheme to stabilize Takagi-Sugeno (T-S) fuzzy systems. We use a non-quadratic Lyapunov function as a fuzzy mixture of multiple quadratic Lyapunov functions. The quadratic Lyapunov functions share the same membership functions with the T-S fuzzy model. The stability conditions we propose are less conservative and stabilize also fuzzy systems which do not admit a quadratic stabilization. The proposed approach is based on two assumptions. The first one relates to a proportional relation between multiple Lyapunov functions and the second one considers an upper bound to the time derivative of the premise membership functions. To illustrate the advantages of our proposal, four examples are given.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 1; 39-51
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on the existence of the maximum likelihood estimate in variance components models
Autorzy:
Grządziel, Mariusz
Michalski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/729792.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
variance component
linear mixed model
maximum likelihood
Opis:
In the paper, the problem of the existence of the maximum likelihood estimate and the REML estimate in the variance components model is considered. Errors in the proof of Theorem 3.1 in the article of Demidenko and Massam (Sankhyā 61, 1999), giving a necessary and sufficient condition for the existence of the maximum likelihood estimate in this model, are pointed out and corrected. A new proof of Theorem 3.4 in the Demidenko and Massam's article, concerning the existence of the REML estimate of variance components, is presented.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 159-167
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel robust H1 fuzzy state-feedback control design on nonlinear Markovian jump systems with time-varyin delay
Autorzy:
Assawinchaichote, W.
Powiązania:
https://bibliotekanauki.pl/articles/205767.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
H∞ fuzzy control
Takagi-Sugeno (TS) fuzzy model
linear matrix inequalities (LMIs)
Markovian jump parameters
time-varying delay
Opis:
This paper considers the problem of designing a robust H∞ fuzzy state-feedback controller for a class of nonlinear Markovian jump systems with time-varying delay. A novel design methodology has been proposed for designing a controller that guarantees the L2-gain of the mapping from the exogenous input noise to the regulated output to be less than some prescribed value. Solutions to the problem are provided in terms of linear matrix inequalities. To illustrate the effectiveness of the design developed in this paper, a numerical example is also provided.
Źródło:
Control and Cybernetics; 2014, 43, 2; 227-248
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel Wiener process model with measurement errors for degradation analysis
Analiza degradacji z zastosowa niem nowego modelu procesu Wienera uwzględniającego błędy pomiarowe
Autorzy:
Wang, Z.
Li, J.
Zhang, Y.
Fu, H.
Liu, C.
Krishnaswamy, S.
Powiązania:
https://bibliotekanauki.pl/articles/301209.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
performance degradation
independent increment process
Wiener process model
linear mean function
linear standard deviation function
measurement error
obniżenie charakterystyk
proces o przyrostach niezależnych
model procesu Wienera
funkcja średniej liniowej
funkcja liniowego odchylenia standardowego
błąd pomiaru
Opis:
Degradation analysis can be used to assess reliability for complex systems and highly reliable products, because few or even no failures are expected in a reasonable life test span. In order to further our study on degradation analysis, an independent increment random process method with linear mean and standard deviation functions is presented to model practical degradation procedures. It is essentially a Wiener process method. Since measurement errors are often created by imperfect instruments, procedures and environments during degradation investigation, the measurement error is incorporated into the independent increment random process. Furthermore, statistical inferences of this model are discussed, and close forms of a product’s median life and percentile of the failure time distribution (FTD) are also derived. The proposed method is illustrated and verified in a comprehensive simulation study and two practice applications for storage disks and Infrared light-emitting diodes. Meanwhile, the time-transformed Wiener process model with measurement error is considered as a reference method. Comparisons show that the proposed model can provide reasonable results, even in considerably small sample size circumstance.
Analizę degradacji można stosować do oceny niezawodności wysoce niezawodnych złożonych systemów i produktów, ponieważ w ich przypadku istnieje bardzo niskie lub zerowe prawdopodobieństwo wystąpienia uszkodzenia w trakcie badania trwałości w przyjętym okresie eksploatacji. W artykule przedstawiono nowo opracowane podejście do modelowania procesu degradacji wykorzystujące metodę procesu o przyrostach niezależnych oraz pojęcia funkcji średniej liniowej i funkcji liniowego odchylenia standardowego. Zasadniczo jest to metoda oparta na procesie Wienera. Ponieważ badania degradacji często wiążą się z błędami pomiarowymi wynikającymi z niedoskonałości stosowanych narzędzi, procedur i warunków badawczych, opisywany proces o przyrostach niezależnych uwzględnia błędy pomiaru. Ponadto, w pracy omówiono wnioski statystyczne, jakie można wyciągnąć na podstawie przedstawionego modelu oraz wyprowadzono wzory ogólne na średnią długość życia produktu oraz na percentyl rozkładu czasu do uszkodzenia. Proponowaną metodę zilustrowano i zweryfikowano na podstawie kompleksowego badania symulacyjnego oraz przykładów praktycznego zastosowania modelu w odniesieniu do dysków pamięci masowej oraz diod podczerwieni. W artykule przedstawiono także model procesu Wienera z transformowanym czasem uwzględniający błąd pomiaru, który posłużył za model referencyjny. Porównania pokazują, że proponowany model może dawać poprawne wyniki, nawet przy bardzo małej liczebności próby.
Źródło:
Eksploatacja i Niezawodność; 2016, 18, 3; 396-405
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A predictive model of multi-stage production planning for fixed time orders
Autorzy:
Kozłowski, E.
Terkaj, W.
Gola, A.
Hajduk, M.
Świć, A.
Powiązania:
https://bibliotekanauki.pl/articles/407278.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
production planning
faulty parts predictability
mathematical model
linear quadratic control
Opis:
The traditional production planning model based upon a deterministic approach is well described in the literature. Due to the uncertain nature of manufacturing processes, such model can however incorrectly represent actual situations on the shop floor. This study develops a mathematical modeling framework for generating production plans in a multistage manufacturing process. The devised model takes into account the stochastic model for predicting the occurrence of faulty products. The aim of the control model is to determine the number of products which should be manufactured in each planning period to minimize both manufacturing costs and potential financial penalties for failing to fulfill the order completely.
Źródło:
Management and Production Engineering Review; 2014, 5, 3; 23-32
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the identification of the second-order linear Nomoto model from the zigzag test
Autorzy:
Artyszuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/134975.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship
manoeuvring
steering
Nomoto
linear model
zigzag
Opis:
In this paper a simple four-point, in terms of time, but eight-value in total, identification method has been developed for the second-order linear Nomoto steering model. The algorithm intrinsically uses the zigzag test data in that it inherited some principles of the well-known procedure for the first-order model, from which it is essentially derived. The performance evaluation was then conducted with both simulated and real data. However, the results of these early, unprecedented efforts are far from satisfactory. Some potential sources of difficulties have been discussed. This calls for further research and improvement in order to provide a practical application of the method.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 53 (125); 59-67
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
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