Temat: probabilistic methods - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Bounds on the Double Italian Domination Number of a Graph
Autorzy:: Azvin, Farzaneh
Rad, Nader Jafari
Powiązania:: https://bibliotekanauki.pl/articles/32222552.pdf
Data publikacji:: 2022-11-01
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: Italian domination
double Italian domination
probabilistic methods
Opis:: For a graph G, a Roman {3}-dominating function is a function f : V → {0, 1, 2, 3} having the property that for every vertex u ∈ V, if f(u) ∈ {0, 1}, then f(N[u]) ≥ 3. The weight of a Roman {3}-dominating function is the sum w(f) = f(V) = Σ_v∈V f(v), and the minimum weight of a Roman {3}-dominating function is the Roman {3}-domination number, denoted by γ_{R3}(G). In this paper, we present a sharp lower bound for the double Italian domination number of a graph, and improve previous bounds given in [D.A. Mojdeh and L. Volkmann, Roman {3}-domination (double Italian domination), Discrete Appl. Math. 283 (2022) 555–564]. We also present a probabilistic upper bound for a generalized version of double Italian domination number of a graph, and show that the given bound is asymptotically best possible.
Źródło:: Discussiones Mathematicae Graph Theory; 2022, 42, 4; 1129-1137
2083-5892
Pojawia się w:: Discussiones Mathematicae Graph Theory
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Developments of power quality studies in electric transportation system
Autorzy:: Burchi, G.
Foiadelli, F.
Zaninelli, D.
Powiązania:: https://bibliotekanauki.pl/articles/262769.pdf
Data publikacji:: 2005
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:: power quality
electric transportation
traction converter
probabilistic methods
Opis:: The paper deals with the update studies on Power Quality for electric traction systems. Probabilistic methods of analysis are presented both for the supply lines and the rolling stocks. Simulation software tools are created for disturbance propagation studies and examples of application are reported with reference to the Italian railway case.
Źródło:: Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 107-112
1896-4672
Pojawia się w:: Electrical Power Quality and Utilisation. Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Probabilistic evaluation of deterioration processes with maintenance activities
Autorzy:: Sugier, J.
Anders, G. J.
Powiązania:: https://bibliotekanauki.pl/articles/2069615.pdf
Data publikacji:: 2011
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: deterioration modelling
probabilistic methods
maintenance policy
risk assessment
Opis:: Reliable operation of contemporary complex systems depends on selecting efficient maintenance policy, which often must take into account not only the reliability, but also economic factors. In this work, we present an approach which allows evaluation of various possible maintenance scenarios with respect to these two areas. The method is based on the concept of a life curve and discounted cost used to study the effect of equipment aging under different maintenance strategies. The deterioration process is first described by a Markov model and then its various characteristics are used to develop the equipment life curve and to quantify other reliability parameters. Based on these data, effects of various “what-if” maintenance scenarios can be examined and their efficiency compared. Simple life curves are combined to model equipment deterioration undergoing diverse maintenance actions, while computing other parameters of the model allows evaluation of additional critical factors, such as probability of equipment failure. Additionally, the paper deals with the problem of the model adjustment so that the computed frequencies are close to the historical values, which is very important in practical applications of the method.
Źródło:: Journal of Polish Safety and Reliability Association; 2011, 2, 1; 177--184
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Landslide susceptibility assessment in Constantine region (NE Algeria) by means of statistical models
Autorzy:: Manchar, N.
Benabbas, C.
Hadji, R.
Bouaicha, F.
Grecu, F.
Powiązania:: https://bibliotekanauki.pl/articles/178256.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: geographic information system
probabilistic methods
information value
weight of evidence
frequency ratio
Opis:: The purpose of the present study was to compare the prediction performances of three statistical methods, namely, information value (IV), weight of evidence (WoE) and frequency ratio (FR), for landslide susceptibility mapping (LSM) at the east of Constantine region. A detailed landslide inventory of the study area with a total of 81 landslide locations was compiled from aerial photographs, satellite images and field surveys. This landslide inventory was randomly split into a testing dataset (70%) for training the models, and the remaining (30%) was used for validation purpose. Nine landslide-related factors such as slope gradient, slope aspect, elevation, distance to streams, lithology, distance to lineaments, precipitation, Normalized Difference Vegetation Index (NDVI) and stream density were used in the landslide susceptibility analyses. The inventory was adopted to analyse the spatial relationship between these landslide factors and landslide occurrences. Based on IV, WoE and FR approaches, three landslide susceptibility zonation maps were categorized, namely, “very high, high, moderate, low, and very low”. The results were compared and validated by computing area under the receiver operating characteristic (ROC) curve (AUC). From the statistics, it is noted that prediction scores of the FR, IV and WoE models are relatively similar with 73.32%, 73.95% and 79.07%, respectively. However, the map, obtained using the WoE technique, was experienced to be more suitable for the study area. Based on the results, the produced LSM can serve as a reference for planning and decision-making regarding the general use of the land.
Źródło:: Studia Geotechnica et Mechanica; 2018, 40, 3; 208-219
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Contribution Overview to the Evaluation and Development of Spare Parts Management Models: Meta-Heuristic and Probabilistic Methods
Autorzy:: Bounou, Oumaima
El Barkany, Abdellah
El Biyaali, Ahmed
Powiązania:: https://bibliotekanauki.pl/articles/1841431.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: spare parts
maintenance
inventory management
probabilistic methods
meta heuristic method
risk management
performance
Opis:: The presence of the spare parts stock is a necessity to ensure the continuity of services. The supply of spare parts is a special case of the global supply chain. The main objective of our research is to propose a global spare parts management approach which allows decision makers to determine the essential points in stock management. Thus, it is important for the stock manager to evaluate the system considered from time to time based on performance indicators. Some of these indicators are presented in the form of a dashboard. The presentation of this chapter chronologically traces the progress of our research work. In the first part, we present the work related to the forecast of spare parts needs through parametric and statistical methods as well as a Bayesian modelling of demand forecasting. To measure the appreciation of the supply of spare parts inventory, the second part focuses on work related to the evaluation of the performance of the spare parts system. Thus, we concretize the link between the management of spare parts and maintenance in the third part, more precisely, in the performance evaluation of the joint -management of spare parts and maintenance, in order to visualize the influence of parameters on the system. In the last section of this chapter, we will present the metaheuristic methods and their use in the management of spare parts and maintenance and make an analysis on work done in the literature.
Źródło:: Management and Production Engineering Review; 2021, 12, 1; 24-37
2080-8208
2082-1344
Pojawia się w:: Management and Production Engineering Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Experiencing a probabilistic approach to clarify and disclose uncertainties when setting occupational exposure limits
Autorzy:: Vernez, David
Fraize-Frontier, Sandrine
Vincent, Raymond
Binet, Stéphane
Rousselle, Christophe
Powiązania:: https://bibliotekanauki.pl/articles/2159984.pdf
Data publikacji:: 2018-07-04
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: risk management
chemical toxicity
assessment factors
uncertainty distributions
probabilistic methods
occupational exposure limits
Opis:: Objectives Assessment factors (AFs) are commonly used for deriving reference concentrations for chemicals. These factors take into account variabilities as well as uncertainties in the dataset, such as inter-species and intra-species variabilities or exposure duration extrapolation or extrapolation from the lowest-observed-adverse-effect level (LOAEL) to the noobserved- adverse-effect level (NOAEL). In a deterministic approach, the value of an AF is the result of a debate among experts and, often a conservative value is used as a default choice. A probabilistic framework to better take into account uncertainties and/or variability when setting occupational exposure limits (OELs) is presented and discussed in this paper. Material and methods Each AF is considered as a random variable with a probabilistic distribution. A short literature was conducted before setting default distributions ranges and shapes for each AF commonly used. A random sampling, using Monte Carlo techniques, is then used for propagating the identified uncertainties and computing the final OEL distribution. Results Starting from the broad default distributions obtained, experts narrow it to its most likely range, according to the scientific knowledge available for a specific chemical. Introducing distribution rather than single deterministic values allows disclosing and clarifying variability and/or uncertainties inherent to the OEL construction process. Conclusions This probabilistic approach yields quantitative insight into both the possible range and the relative likelihood of values for model outputs. It thereby provides a better support in decision-making and improves transparency. Int J Occup Med Environ Health 2018;31(4):475–489
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2018, 31, 4; 475-489
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Using probabilistic automata for security protocols verification
Autorzy:: Siedlecka-Lamch, O.
Kurkowski, M.
Piątkowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/122825.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: verification of security protocols
probabilistic methods
weryfikacja protokołów bezpieczeństwa
metody probabilistyczne
protokoły uwierzytelniania
Opis:: The article discusses the issues of modeling and the analysis of executions, which is a substantial part of modern communication protocols - authentication protocols, which are generally referred to herein as security protocols. The article presents a way of security protocols executions analysis with the use of probabilistic automata, without well known and widely used perfect cryptography assumption (we assume allowing the possibility of breaking a key with a specified probability). This type of analysis leads to interesting observations about the operation of the protocol and its weaknesses.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 2; 119-125
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: O możliwościach wykorzystania teorii niezawodności dla praktyki projektowania konstrukcji okrętowych
On the Possibility of Applying Reliability Theory for the Practice of the Ships Structural Design
Autorzy:: Hann, M.
Powiązania:: https://bibliotekanauki.pl/articles/906457.pdf
Data publikacji:: 2005
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: niezawodność
konstrukcje okrętowe
metody probabilistyczne
symulacja komputerowa
reliability
ships structures
probabilistic methods
computer simulation
Opis:: Konstrukcje okrętowe mogą być projektowane przy użyciu probabilistycznych metod analizy niezawodności. Jest to możliwe ponieważ proces losowy kołysań statku na fali jest dobrze rozpoznany. Konstrukcje okrętowe i oceanotechniczne są bardzo skomplikowane i wrażliwe na oddziaływanie otoczenia oraz czynnika ludzkiego. Z tego powodu związki pomiędzy zdarzeniami powodującymi uszkodzenia są złożone co prowadzi do zastosowania w analizie niezawodności metod symulacji komputerowej.
Ship structures can be designed using probabilistic methods for reliability analysis. It is possible, as the random process of ship motion in waves is well recognized. Ship and offshore structures are very complex and susceptible to environment and human activity. For this reason the connections between the events causing damages are complex and lead to the application of computer simulation methods in the reliability analysis.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 7 (79); 53-66
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Statystyczne modele procesu separacji cząstek w warunkach zmiany kąta nachylenia sita
Statistical models of the separation process of the particles conditioned of change of the angle of inclination of the sieve
Autorzy:: Detyna, J.
Powiązania:: https://bibliotekanauki.pl/articles/288353.pdf
Data publikacji:: 2006
Wydawca:: Polskie Towarzystwo Inżynierii Rolniczej
Tematy:: entropia
probalistyka
proces separacji
nachylenie sita
entropy
probabilistic methods
separation process
inclination of the sieve
Opis:: Dla analizy rozkładów gęstości prawdopodobieństwa zaproponowano opisaną wcześniej entropię informacyjną Shannona. W odniesieniu do analizowanych rozkładów jej wartość wiernie oddaje poprzeczną dynamikę separowanych cząsteczek.
For analysis of distributions of the density of the probability we proposed described the Shannon's informational entropy. With reference to analyzed distributions the value of this measure faithfully gives the transverse dynamics of separated particles.
Źródło:: Inżynieria Rolnicza; 2006, R. 10, nr 2 (77), 2 (77); 213-219
1429-7264
Pojawia się w:: Inżynieria Rolnicza
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Methods for optimization of sea waterway systems and their application
Autorzy:: Gucma, S.
Ślączka, W.
Powiązania:: https://bibliotekanauki.pl/articles/258876.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: optimization of sea waterway systems
sea traffic engineering
probabilistic methods of determination safe breadth of fairways
Opis:: This paper presents developed optimization methods for sea waterway systems. Objective function of optimization of sea waterway systems have been formulated and its detail form for fairways has been determined. Three probabilistic methods for determining safe bed-breadth of fairway are described. Limitations of the presented methods are also discussed. The developed optimization methods for sea waterway systems have been applied to determine parameters of a modernized fairway between Świnoujście and Szczecin as well as its navigation systems.
Źródło:: Polish Maritime Research; 2015, 3; 14-19
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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