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Wyświetlanie 1-15 z 135
Tytuł:
Cyclic Bayesian Network : Markov Process Approach
Autorzy:
Kłopotek, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/92928.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Bayesian networks
Markov process
Opis:
The paper proposes a new interpretation of the concept of cyclic Bayesian Networks, based on stationary Markov processes over feature vector state transitions.
Źródło:
Studia Informatica : systems and information technology; 2006, 1(7); 47-55
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Availability of AIS binary data transmission based on dynamic measurements performed
Autorzy:
Jaskólski, K.
Powiązania:
https://bibliotekanauki.pl/articles/320538.pdf
Data publikacji:
2013
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
AIS
Markov process
availability
Opis:
The problem of determining coordinates for the requirements of maritime navigation, considered only in terms of measurement error, seems to be solved on a global scale. In view of the above, the operational characteristics of radio navigation systems such as availability are equally important. This paper analyses the problem of AIS binary transmission availability. An attempt was made to assess the availability of the AIS service transmission channel based on dynamic measurements. For this purpose, the theory of Markov processes defined on a discrete state space was applied. The Criterion of state system availability was adopted, stochastic matrix of probabilities of transitions between the states of the availability and accessibility of states limit the probability of AIS. In this paper, the author proposed a model for the assessment of AIS Service availability. To meet the objective of the research, recorded data derived from the Southern Baltic and Danish Straits Base Stations were used.
Dokładności, jakie zapewniają współczesne systemy satelitarne, sprawiają, że problem wyznaczania współrzędnych pozycji dla celów żeglugi morskiej w kategoriach minimalizacji błędów pomiaru wydaje się być rozwiązany w skali globalnej. Wobec powyższego równie ważna staje się operacyjna charakterystyka systemów radionawigacyjnych w oparciu o takie wielkości, jak na przykład dostępność. W artykule przedstawiono analizę zagadnienia dostępności transmisji binarnej w systemie AIS. Badania przeprowadzono dla oszacowania dostępności kanału transmisji AIS w oparciu o pomiary z obiektu ruchomego. W tym celu zastosowano teorię procesów Markova zdefiniowanych na dyskretnej przestrzeni stanów. Adaptowano kryterium stanu dostępności systemu opisane stochastyczną matrycą prawdopodobieństw przejść między stanami. Autor zaproponował model dla oszacowania dostępności AIS. Badania wykonano na danych zarejestrowanych na południowym Bałtyku oraz w cieśninach bałtyckich.
Źródło:
Annual of Navigation; 2013, 20; 25-36
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety and risk evaluation of Stena Baltica ferry in variable operation conditions
Autorzy:
Kołowrocki, K.
Soszyńska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069680.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
safety function
operation process
semi-markov process
Opis:
Basic safety structures of multi-state systems of components with degrading safety states related to their variable operation conditions are defined. For these systems the conditional and unconditional multi-state safety functions are determined. A semi-markov process for the considered systems operation modelling is applied. Further, the paper offers an approach to the solution of a practically important problem of linking the multi-state systems safety models and the systems operation processes models. Theoretical definitions and results are illustrated by the example of their application in the safety and risk evaluation of the Stena Baltica ferry operating at the Baltic Sea. The ferry transportation system has been considered in varying in time operation conditions. The system safety structure and its components safety functions were changing in variable operation conditions.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 231--240
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-Markov processes: application in system reliability and maintenance
Autorzy:
Grabski, F.
Powiązania:
https://bibliotekanauki.pl/articles/2069404.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
maintenance
semi-Markov process
semi-Markov perturbed processes
Opis:
The author’s monograph “Semi-Markov Processes: Application in System Reliability and Maintenance” which will be published by Elsevier in 2014 is presented. The paper is composed of an introduction, the monograph contents, conclusions and the references the monograph contents is based on.
Źródło:
Journal of Polish Safety and Reliability Association; 2014, 5, 1; 57--62
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The random failure rate
Autorzy:
Grabski, F.
Powiązania:
https://bibliotekanauki.pl/articles/2069577.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
random failure rate
semi-Markov process
Opis:
A failure rate of the object is assumed to be a stochastic process with nonnegative, right continuous trajectories. A reliability function is defined as an expectation of a function of a random failure rate process. The properties and examples of the reliability function with the random failure rate are presented in the paper. A semi-Markov process as the random failure rate is considered in this paper.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 143--149
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A theoretical framework for determining the appropriate level of subsidy in an economy
Autorzy:
Osagiede, A. A.
Ekhosuehi, V. U.
Powiązania:
https://bibliotekanauki.pl/articles/406643.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
entropy
Markov process
per capita income
subsidy
Opis:
A framework has been developed for determining the subsidy that, in the long run, serves to equalize the per capita income shares across income classes. The framework characterizes the income dynamics by the Markov process and uses the principle of maximum entropy for selecting among alternative subsidy schemes. The study provides a means to forecast the per capita income shares at any instant of time and serves as an objective tool to decide on the appropriate level of subsidy.
Źródło:
Operations Research and Decisions; 2015, 25, 2; 19-35
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A stochastic model of changes in the operational states of means of transport
Autorzy:
Landowski, B.
Perczyński, D.
Powiązania:
https://bibliotekanauki.pl/articles/949491.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
homogeneous Markov process
operation process
operational state
transport means
Opis:
In the article, application of a Markov process for modelling the process of transport means operational state changes whose duration times can be estimated by Erlang distribution is presented. The research object is a system of city bus transport operation, used in a selected agglomeration. A homogenous Markov process was assumed a mathematical model of the process of transport means operation. Transformation of a stochastic process, for which distributions of random variables denoting duration times of the states are Erlang distributions, into a stochastic process characterized by exponential distribution of the state duration times, was performed at the costs of the state space extension. The use of a homogeneous Markov process for mathematical modelling of the operation process was dictated by the fact that the process reflects adequately, from the point of view of the research goal, the real operation process. In order to illustrate the process, a hypothetical, simplified calculation example was provided. Reliability of technical objects needs to be maintained at appropriate level, which is the responsibility of the repair and maintenance subsystem ensuring. This subsystem consists of two subsystems. The main tasks of the mobile emergency teams include providing vehicles, that is, buses that are outside the depot with the serviceability state as quickly as possible or hauling damaged buses to technical service stations.
Źródło:
Journal of KONES; 2018, 25, 2; 223-230
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary statistical identification and prediction of the container gantry crane operation process
Autorzy:
Kołowrocki, K.
Soszyńska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069653.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
semi-Markov process
system operation process
sojourn time
estimation
Opis:
In the paper a Semi-markov process is used to construct a general model of complex industrial systems’ operation processes. Main parameters of this model are defined and its main characteristics are determined as well. In particular case, for a gantry crane, the operation states are defined, the relationships between them are fixed and particular model of its operation process is constructed and finally its main characteristics are determined.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 173--180
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model-building adaptive critics for semi-Markov control
Autorzy:
Gosavi, A.
Murray, S.
Hu, J.
Ghosh, S.
Powiązania:
https://bibliotekanauki.pl/articles/91878.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
adaptive critics
learning algorithm
semi-Markov process
decision process
Opis:
Adaptive (or actor) critics are a class of reinforcement learning algorithms. Generally, in adaptive critics, one starts with randomized policies and gradually updates the probability of selecting actions until a deterministic policy is obtained. Classically, these algorithms have been studied for Markov decision processes under model-free updates. Algorithms that build the model are often more stable and require less training in comparison to their model-free counterparts. We propose a new model-building adaptive critic, which builds the model during the learning, for a discounted-reward semi-Markov decision process under some assumptions on the structure of the process. We illustrate the use of our algorithm with numerical results on a system with 10 states and a real-world case-study from management science.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 1; 43-58
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The upper bound of the number of eigenvalues for a class of perturbed Dirichlet forms
Autorzy:
Cupała, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/1289649.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
eigenvalue asymptotics
Dirichlet form
Markov process
Lie group
Opis:
The theory of Markov processes and the analysis on Lie groups are used to study the eigenvalue asymptotics of Dirichlet forms perturbed by scalar potentials.
Źródło:
Studia Mathematica; 1995, 113, 2; 109-125
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotics of thermal dispersion in periodic media
Autorzy:
Timofte, C.
Powiązania:
https://bibliotekanauki.pl/articles/279607.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Markov process
central limit theorem
asymptotic dispersion coefficient
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 1; 95-108
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attempts at calculating chosen contributors with regard to the Semi- Markov process and the Weibull function distribution
Autorzy:
Zajac, M.
Kierzkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069531.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
Semi Markov process
exponential distribution
availability
transient probabilities
Opis:
The main aim of this article is the presentation of the way of making calculation with the application of the semi-Markov processes, with the continuous time t, where non-exponential distribution function is going to be applied. These type of calculations were published but the time there was approaching infinity. Engineering practice proves that the lack of solutions of this issue leads to obtainment of solutions that are encumbered with errors. This article is the first attempt of the error analysis.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 217--222
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A general model of industrial systems operation processes related to their environment and infrastructure
Autorzy:
Kołowrocki, K.
Soszyńska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069711.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
system operation process
semi-markov process
system in varying operation
Opis:
The operation process of the complex industrial system is considered and its operation states are introduced. The semi-markov process is used to construct a general probabilistic model of the considered complex industrial system operation process. To build this model the vector of probabilities of the system operation process initials operation states, the matrix of probabilities of the system operation process transitions between the operation states, the matrix of conditional distribution functions and the matrix of conditional density functions of the system operation process conditional sojourn times in the operation states are defined. To describe the system operation process conditional sojourn times in the particular operation states the uniform distribution, the triangle distribution, the double trapezium distribution, the exponential distribution, the Weibull distribution and the normal distribution are suggested. Under these all assumptions from the constructed general model the main characteristics of the system operation process are find. The mean values of the system operation process conditional sojourn times in particular operation states having these distributions are calculated. Moreover, the unconditional distribution functions of the system operation process unconditional sojourn times in the particular operation states, the mean values of the system operation process unconditional sojourn times in the particular operation states, the limit values of the transient probabilities of the system operation process at the particular operation states and the mean values of the system operation process total sojourn times in the particular operation states are determined.
Źródło:
Journal of Polish Safety and Reliability Association; 2008, 2; 223--226
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex technical systems safety prediction
Autorzy:
Soszyńska-Budny, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069501.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
safety function
complex system
Semi-Markov process
system operation process
Opis:
There are presented general safety analytical models of complex multistate technical systems related to their operation processes. They are the integrated general models of complex technical systems, linking their multistate safety models and their operation processes models and considering variable at the different operation states safety structures and their components safety parameters. The conditional safety functions at the system particular operation states and independent of the system particular operation states the unconditional safety function and the risk function of the complex technical systems are defined. These joint models of the safety and the variable in time system operation processes are constructed for multistate series, parallel, “m out of n”, consecutive “m out of n: F”, series-parallel, parallel-series, series-“m out of k”, “mi out of li”-series, series-consecutive “m out of k: F” and consecutive “mi out of li: F”-series systems. The joint models are applied to determining safety characteristics of these systems related to their varying in time safety structures and their components safety characteristics. Under the assumption that the considered systems are exponential, the unconditional safety functions of these systems are determined. The proposed models and methods are applied to the safety analysis, evaluation and prediction of the one subsystem of the port grain transportation system related to varying in time their operation processes, structures and components safety parameters.
Źródło:
Journal of Polish Safety and Reliability Association; 2014, 5, 2; 127--142
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 135

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