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Wyświetlanie 1-15 z 70
Tytuł:
Constructing stochastic models for investigation of dangerous events and accidents number in Baltic Sea region ports
Autorzy:
Grabski, F.
Powiązania:
https://bibliotekanauki.pl/articles/2069142.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
stochastic process
Poisson process
safety characteristics
Opis:
The stochastic processes theory provides concepts and theorems that allow to build probabilistic models concerning incidents or (and) accidents. Counting processes are applied for modelling number of the dangerous events and accidents number in Baltic Sea region ports in the given time intervals. A crucial role in construction of the models plays a Poisson process and its generalizations. Three models of the incidents or (and) accidents number in the seaports are here constructed. Moreover some procedures of the model parameters identification and the computer procedures for anticipation of the dangerous events number are presented in the paper.
Źródło:
Journal of Polish Safety and Reliability Association; 2016, 7, 1; 73--78
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the software testing process taking into account the secondary errors
Autorzy:
Konopacki, G.
Powiązania:
https://bibliotekanauki.pl/articles/94955.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
software
software testing
stochastic process
Opis:
It discusses the two formal models of software testing by the concept of a black box. In the first model assumes a non-zero probability of not removing the detected error. In the second model assumes also non-zero probability to introduce additional of error, so-called secondary error. In both cases the systems of ChapmanKolmogorov differential equations was formulated. Solving them was obtained formulas to enable an estimate the expected number of errors remaining in the software after end of testing and estimation of the expected duration of the process to complete software testing them.
Źródło:
Information Systems in Management; 2016, 5, 2; 175-184
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of transport potential of the transportation company taking into account random demand for transport services
Autorzy:
Konopacki, Gustaw
Powiązania:
https://bibliotekanauki.pl/articles/94887.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
transport potential
demand
stochastic process
Opis:
Is considered a transport company, which operates a uniform in the sense of destination, means of transport for example tankers, with random exploitation characteristics. The company's transport potential is measured by the number of transportable means of transport for a sufficiently long period of time. The company operates on the market of transport services, where the demand for transport services is also random. The problem of optimizing the transport potential of a transport company is being considered, taking into account the random demand for transport services.
Źródło:
Information Systems in Management; 2019, 8, 1; 15-25
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the degree of fitting the transport potential of the transportation company to a random demand for transport services
Autorzy:
Konopacki, G.
Powiązania:
https://bibliotekanauki.pl/articles/94939.pdf
Data publikacji:
2018
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
transport potential
demand
stochastic process
Opis:
Will be considered transport company exploiting the uniform in the sense of destination, means of transport such as tankers, with a total transport potential equal to a loading units (e.g. tones). The company operates in the transport market, where demand for transport services is random. The problem of fitting the transport potential of a transport company to the demand for such services is formulated. As measure of this fit assumes that the probability of a firm's transport potential is not being exceeded by demand over the given time horizon. Practically useful formulas for estimating such probability for cases where demand for transport services is described by stationary and non-stationary normal stochastic processes. The results are illustrated by numerical examples.
Źródło:
Information Systems in Management; 2018, 7, 2; 120-132
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization potential transport of transport company
Autorzy:
Konopacki, G.
Powiązania:
https://bibliotekanauki.pl/articles/94791.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
transport potential
stochastic process
multicriteria optimization
Opis:
The article presents a method for determining the optimum number of vehicles transport company, depending on the size of the specific demand for transport services and depending on the performance properties of means of transport. Formulated the task of multi-criteria optimization and presents the results of its solution.
Źródło:
Information Systems in Management; 2017, 6, 1; 14-25
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo method for reliability of parallel system with dependent failures of component
Autorzy:
Grabski, F.
Powiązania:
https://bibliotekanauki.pl/articles/2069174.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
stochastic process
Weibull distribution
dependency
Opis:
A problem of parallel system reliability with dependent failures of components is presented in the paper. It is assumed that lifetimes of components are independent random variable having Weibull distribution. We take under consideration a parallel (in reliability meaning) system consisting of n independent at the beginning of work and identical components. We assume that a load of the working system affects on the reliability of its components and the load of the system is distributed on all working components. Therefore, a failure rate of each component is changeable during run of the system and depends on a number of working elements at this point in time. As a model of the system failures we construct a stochastic process which value at the moment t denotes the number of working components. Generally it is neither Markov nor semi-Markov process. To assess the reliability characteristics of the system we simulate this stochastic process using the Monte-Carlo method and we calculate values of nonparametric kernel density and reliability functions estimators.
Źródło:
Journal of Polish Safety and Reliability Association; 2016, 7, 1; 67--72
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of potential transport of transport company for random demand for transport services
Autorzy:
Konopacki, G.
Powiązania:
https://bibliotekanauki.pl/articles/409198.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
potential transport company
modeling
stochastic process
Opis:
Will be considered transport company exploiting the uniform in the sense of destination, means of transport such as tankers, with a total transport potential equal to a loading units (e.g. tones). The company operates in the transport market, where demand for transport services is random. Formulate the problem of satisfying the transport demand in full by transport company and shall be given the formulas to calculating the probability of such an event with the general assumptions about the demand for transport services. Practically useful formulas for estimating such a probability is given for the demand for transport services the described by normal stationary stochastic process. The results are illustrated by an example of the calculation.
Źródło:
Research in Logistics & Production; 2014, 4, 4; 283-291
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A probabilistic concept of load assessmentof self-ignition engines
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/258922.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hypothesis
load
self-ignition engine
stochastic process
Opis:
A proposal of probabilistic interpretation of loading process of self-ignition combustion engines, was presented. Probabilistic description of loading the engines was proposed with taking into account known parameters (indices) of their operation. It was demonstrated that instantaneous load of such engines can be considered a random variable. Attention was paid to the fact that the load can be taken as a multi-dimensional random variable. Engine load changes during its operation were considered as the loading process and presented in the form of a multi-dimensional stochastic process whose states are loads considered to be random variables. It was demonstrated that the loading process can be taken as the stochastic one of asymptotically independent incements, stationary and ergodic. Justification of the above mentioned features of the loading process is contained in the presented hypotheses. It was also demonstrated that in testing the load process of self-ignition engines stochastic relation between thermal and mechanical loading should be taken into account.
Źródło:
Polish Maritime Research; 2008, 2; 65-70
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A computational tool for general model of industrial systems operations processes
Autorzy:
Lumanpauw, E.
Habibullah, M. S.
Kołowrocki, K.
Soszyńska, J.
Xie, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069655.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
stochastic process
semi-Markov model
computational tool
reliability
Opis:
The complexities of real industrial systems operation processes require computational methods that can analyze the large data and evaluate the behaviours of these systems. The use of methods such as Bayesian Network, Formal Safety Assessment and Statistical-Model based method were discussed as possibilities. Of which, a computational tool, based on the Semi-Markov model, was developed. This tool was then applied to analyze the behaviour of the operation processes of the oil transportation system in Dębogórze, Poland. The analyses showed that the computational solutions generated compared favorably well with the analytical calculations, enabling possible extensions of the tool to include reliability and optimization evaluations to be explored.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 295--302
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some applications of Girsanovs theorem to the theory of stochastic differential inclusions
Autorzy:
Kisielewicz, Micha
Powiązania:
https://bibliotekanauki.pl/articles/729482.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
stochastic process
Girsanov’s theorem
stochastic differential inclusion
weak solution
Brownian motion
Opis:
The Girsanov's theorem is useful as well in the general theory of stochastic analysis as well in its applications. We show here that it can be also applied to the theory of stochastic differential inclusions. In particular, we obtain some special properties of sets of weak solutions to some type of these inclusions.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2003, 23, 1; 21-29
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluktuujący świat Mariana Smoluchowskiego
Fluctuating world of Marian Smoluchowski
Autorzy:
Fuliński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/691096.pdf
Data publikacji:
2017
Wydawca:
Copernicus Center Press
Tematy:
atomic theory
fluctuations
Brownian motion
stochastic process
non-markovian process
Marian Smoluchowski
Opis:
The main goal of this paper is to present the Marian Smoluchowski’s work on thermal and primordial fluctuations which are the main cause of Brownian motion and one of the first empirical evidences for molecular structure of matter.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2017, 62; 127-138
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling sequential events for risk, safety and maintenance assessments
Autorzy:
Eid, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069602.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
probability
sequential events
double Poisson Stochastic Process
modulated
spectral
polynomial
Opis:
Assessing the Occurrence Probability of a given sequence of events in a determined order is necessary in many scientific fields. That is the case in the following fields: nucleation and microstructure growth in materials, Narrow-Band process, financial risk analysis, Sequential detection theory, rainfall modelling, in optics to model the sequences of photoelectrons under detection, population biology, software reliability, queuing in network traffic exhibiting long-range dependence behaviour, and DNA sequences and gene time expression modelling. However, the topic has a particular interest in the field of risk, safety and maintenance assessments. The lecture will focus on sequences composed of Double Stochastic Poisson Processes.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 83--88
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of building a model of operational changes for the marine combustion engine describing the impact of the damages of this engine on the characteristics of its operation process
Autorzy:
Landowski, B.
Pająk, M.
Żółtowski, B.
Muślewski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/258818.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
process of operation
stochastic process
compression ignition engine
condition of object
operating condition
Opis:
This article deals with the modeling of the processes of operating both marine main and auxiliary engines. The paper presents a model of changes in operating conditions of ship’s internal combustion engine. The semi-Markov decision process was used to mathematically describe the process model of the engine. The developed model describes the effect of engine damage on the characteristics of its operation. A change in the input parameters of the model can simulate the influence of internal and external factors on the course of the analyzed process. A simplified calculation example is also presented for illustration purposes. The presented method together with developed algorithms and IT tools can be used to solve a wide range of problems related to the operation of marine main engines and other marine equipment as well as maritime and port facilities. This concerns primarily the economic, risk management and operational security issues of complex technical systems, as well as the readiness and reliability analysis of technical facilities.
Źródło:
Polish Maritime Research; 2017, 4; 67-76
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New approach in modelling of the patients behavior in Primary Health Care (PHC)
Nowe podejście do modelowania zachowań pacjentów Podstawowej Opieki Zdrowotnej (POZ)
Autorzy:
Bauer, W.
Powiązania:
https://bibliotekanauki.pl/articles/282128.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
PHC
stochastic process modelling
population modeling
POZ
modelowanie stochastyczne
modelowanie populacji
Opis:
The purpose of this paper is to show the concept of simulation of Primary Health Care (PHC) patients behavior. There are two reasons for interest in this area. The first of them is the need for support in decision making regarding financing and management of PHC facilities on levels from national (Natonal Health Fund) to local (PHC provider). The second one is the lack of effective methods for such population modeling. In this paper author describe an idea of probability distribution modeling and present preliminary results of patient visits simulation over a period of a year.
Celem artykułu jest pokazanie koncepcji symulacji zachowań pacjentów Podstawowej Opieki Zdrowotnej (POZ). Temat ten jest ważny z dwóch powodów. Po pierwsze model taki mógłby posłużyć w podejmowaniu decyzji w rozdzielaniu funduszy pomiędzy jednostkami POZ przez Narodowy Fundusz Zdrowia. Drugim z powodów jest obecnie brak efektywnych metod modelowania populacji POZ. W niniejszej pracy autor opisuje ideę modelowania populacji przy użyciu rozkładu prawdopodobieństwa i przedstawia wstępne wyniki symulacji dla wizyt pacjentów w ciągu roku.
Źródło:
Automatyka / Automatics; 2015, 19, 1; 17-28
1429-3447
2353-0952
Pojawia się w:
Automatyka / Automatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Set-valued stochastic integrals and stochastic inclusions in a plane
Autorzy:
Sosulski, Władysław
Powiązania:
https://bibliotekanauki.pl/articles/729310.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
stochastic inclusions in the plane
set-valued random field
two-parameter stochastic process
weak compactness
Opis:
We present the concepts of set-valued stochastic integrals in a plane and prove the existence of a solution to stochastic integral inclusions of the form
$z_{s,t} ∈ φ_{s,t} + ∫_{0}^{s} ∫_{0}^{t} F_{u,v}(z_{u,v})dudv + ∫_{0}^{s} ∫_{0}^{t}G_{u,v}(z_{u,v})dw_{u,v}$
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2001, 21, 2; 249-259
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 70

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