Temat: Stochastic Process - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Constructing stochastic models for investigation of dangerous events and accidents number in Baltic Sea region ports
Autorzy:: Grabski, F.
Tematy:: stochastic process
Poisson process
safety characteristics; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Powiązania:: https://bibliotekanauki.pl/articles/2069142.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optimization of transport potential of the transportation company taking into account random demand for transport services
Autorzy:: Konopacki, Gustaw
Tematy:: transport potential
demand
stochastic process; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/94887.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Assessment of the degree of fitting the transport potential of the transportation company to a random demand for transport services
Autorzy:: Konopacki, G.
Tematy:: transport potential
demand
stochastic process; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/94939.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Modeling the software testing process taking into account the secondary errors
Autorzy:: Konopacki, G.
Tematy:: software
software testing
stochastic process; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/94955.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Assessment of potential transport of transport company for random demand for transport services
Autorzy:: Konopacki, G.
Tematy:: potential transport company
modeling
stochastic process; Pokaż więcej
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:: https://bibliotekanauki.pl/articles/409198.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Optimization potential transport of transport company
Autorzy:: Konopacki, G.
Tematy:: transport potential
stochastic process
multicriteria optimization; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/94791.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Monte Carlo method for reliability of parallel system with dependent failures of component
Autorzy:: Grabski, F.
Tematy:: reliability
stochastic process
Weibull distribution
dependency; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Powiązania:: https://bibliotekanauki.pl/articles/2069174.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A probabilistic concept of load assessmentof self-ignition engines
Autorzy:: Girtler, J.
Tematy:: hypothesis
load
self-ignition engine
stochastic process; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258922.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A computational tool for general model of industrial systems operations processes
Autorzy:: Lumanpauw, E.
Habibullah, M. S.
Kołowrocki, K.
Soszyńska, J.
Xie, M.
Tematy:: stochastic process
semi-Markov model
computational tool
reliability; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Powiązania:: https://bibliotekanauki.pl/articles/2069655.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Comparative Analysis of Stochastic and Uncertain Process Degradation Modeling Based on RQRL
Autorzy:: Liu, Kai
Zou, Tianji
Xin, Mincheng
Tematy:: degradation modeling
epistemic uncertainty
uncertain process
stochastic process
reliability estimation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/59112739.pdf Link otwiera się w nowym oknie
Opis:: Small sample sizes cause epistemic uncertainties in reliability estimation and even result in potential risks in maintenance strategies. To explore the difference between stochastic- and uncertain-process-based degradation modeling in reliability estimation for small samples, this study proposes a comparative analysis methodology based on the range of quantile reliable lifetime (RQRL). First, considering both unit-to-unit variability and epistemic uncertainty, we proposed the Wiener and Liu process degradation models. Second, based on the RQRL, a comparative analysis method of different degradation models for reliability estimation under various sample sizes and measurement times was proposed. Third, based on a case study, the sensitivities of the Wiener and Liu process degradation models for various sample sizes and measurement times were compared and analyzed based on the RQRL. The results demonstrated that using the uncertain process degradation model improved the uniformity and stability of reliability estimation under small-sample conditions.
Dostawca treści:: Biblioteka Nauki

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