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Skocz do pozycji: 1.

Tytuł:: Importance measures in presence of uncertainties
Autorzy:: Baraldi, P.
Zio, E.
Compare, M.
Powiązania:: https://bibliotekanauki.pl/articles/2069576.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: importance measures
birnbaum importance
uncertainty
sorting algorithm
quicksort
Opis:: This paper presents a work on the study of importance measures in presence of uncertainties originating from the lack of knowledge and information on the system (epistemic uncertainties). A criterion is proposed for ranking the risk contributors in presence of uncertainties described by probability density functions.
Źródło:: Journal of Polish Safety and Reliability Association; 2008, 1; 33--39
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Particle filtering for the estimation of system mode of operation
Autorzy:: Cadini, F.
Avram, D.
Zio, E.
Powiązania:: https://bibliotekanauki.pl/articles/2069691.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: particle filtering
Monte Carlo
hybrid system
discrete modes of operation
Opis:: Efficient diagnosis and prognosis of system faults depend on the ability to estimate the system state on the basis of noisy measurements of the system dynamic variables and parameters. The system dynamics is typically characterized by transitions among discrete modes of operation, each one giving rise to a specific continuous dynamics of evolution. The estimation of the state of these hybrid dynamic systems is a particularly challenging task because it requires keeping track of the transitions among the multiple modes of system dynamics corresponding to the different modes of operation. In this paper a Monte Carlo estimation method is illustrated with an application to a case study of literature which consists of a tank filled with liquid, whose level is autonomously maintained between two thresholds. The system behavior is controlled by discrete mode actuators, whose states are estimated by a Monte Carlo-based particle filter on the basis of noisy level and temperature measurements.
Źródło:: Journal of Polish Safety and Reliability Association; 2009, 1; 77--86
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optimising a fuzzy fault classification tree by a single-objective genetic algorithm
Autorzy:: Zio, E.
Baraldi, P.
Popescu, I. C.
Powiązania:: https://bibliotekanauki.pl/articles/2069595.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: fault classification
decision tree
fuzzy logic
genetic algorithm
Opis:: In this paper a single-objective Genetic Algorithm is exploited to optimise a Fuzzy Decision Tree for fault classification. The optimisation procedure is presented with respect to an ancillary classification problem built with artificial data. Work is in progress for the application of the proposed approach to a real fault classification problem.
Źródło:: Journal of Polish Safety and Reliability Association; 2007, 2; 391--400
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:: Analysis of the safety efficiency of a road network : a real case study
Autorzy:: Zio, E.
Sansavini, G.
Maja, R.
Marchionni, G.
Powiązania:: https://bibliotekanauki.pl/articles/2069613.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: complex systems
road networks
safety
vulnerability
Opis:: In this paper, recently introduced topological measures of interconnection and efficiency of network systems are applied to the safety analysis of the road transport system of the Province of Piacenza in Italy. The vulnerability of the network is evaluated with respect to the loss of a road link, e.g. due to a car accident, road work or other jamming occurrences. Eventually, the improvement in the global and local safety indicators following the implementation of a road development plan is evaluated.
Źródło:: Journal of Polish Safety and Reliability Association; 2007, 2; 401--406
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Soft computing methods applied to condition monitoring and fault diagnosis for maintenance
Autorzy:: Zio, E.
Powiązania:: https://bibliotekanauki.pl/articles/2069596.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: soft computing
artificial neural networks
fuzzy logic
genetic algorithms
condition monitoring
fault diagnosis
maintenance
Opis:: Malfunctions in equipment and components are often sources of reduced productivity and increased maintenance costs in various industrial applications. For this reason, machine condition monitoring is being pursued to recognize incipient faults in the strive towards optimising maintenance and productivity. In this respect, the following lecture notes provide the basic concepts underlying some methodologies of soft computing, namely neural networks, fuzzy logic systems and genetic algorithms, which offer great potential for application to condition monitoring and fault diagnosis for maintenance optimisation. The exposition is purposely kept on a somewhat intuitive basis: the interested reader can refer to the copious literature for further technical details.
Źródło:: Journal of Polish Safety and Reliability Association; 2007, 2; 363--377
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Monte Carlo simulation-based reliability model for the PSA of a radioactive waste repository
Autorzy:: Cadini, F.
Avram, D.
Zio, E.
Luce, A.
Taglioni, A.
Powiązania:: https://bibliotekanauki.pl/articles/2069572.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: radioactive waste repository
probabilistic safety assessment
reliability-based model
Monte Carlo simulation
Opis:: Disposal facilities for radioactive wastes comprise a series of engineered barriers whose purpose is to contain the radionuclides until their radiation hazard has decreased to acceptable levels. In this regard, it is required that the long-term functionality of the system of barriers be evaluated by a quantitative risk analysis procedure, also called performance assessment. In this paper, a Monte Carlo simulation-based reliability model is propounded for the preliminary analysis of the safety performance of a radioactive waste repository, accounting also for barrier degradation processes. The model strengths are: simplicity, chich allows ease of computation, and flexibility, which allows modification to account for various physical aspects and inter-comparison of their effects. An application to a case study of literature is presented to validate the approach and demonstrate its flexibility.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 1; 43--50
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Multi-objective genetic algorithms for the reliability analysis and optimization of electrical transmission networks
Autorzy:: Cadini, F.
Zio, E.
Golea, L. R.
Petrescu, C. A.
Powiązania:: https://bibliotekanauki.pl/articles/2069695.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: multi-objective genetic algorithms
critical infrastructures
reliability efficiency
group closeness centrality measure
Opis:: The results of two applications of multi-objective genetic algorithms to the analysis and optimization of electrical transmission networks are reported to show the potential of these combinational optimization schemes in the treatment of highly interconnected, complex systems. In a first case study, an analysis of the topological structure of an electrical power transmission system of literature is carried out to identify the most important groups of elements of different sizes in the network. The importance is quantified in terms of group closeness centrality. In the second case study, an optimization method is developed for identifying strategies of expansion of an electrical transmission network by addition of new lines of connection. The objective is that of improving the transmission reliability, while maintaining the investment cost limited.
Źródło:: Journal of Polish Safety and Reliability Association; 2009, 1; 87--94
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Recurrent neural networks for dynamic reliability analysis
Autorzy:: Cadini, F.
Zio, E.
Pedroni, N.
Powiązania:: https://bibliotekanauki.pl/articles/2069583.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: dynamic reliability analysis
infinite impulse response
locally recurrent neural network
long-term non-linear dynamics
system state memory
simplified nuclear reactor
Opis:: A dynamic approach to the reliability analysis of realistic systems is likely to increase the computational burden, due to the need of integrating the dynamics with the system stochastic evolution. Hence, fast-running models of process evolution are sought. In this respect, empirical modelling is becoming a popular approach to system dynamics simulation since it allows identifying the underlying dynamic model by fitting system operational data through a procedure often referred to as ‘learning’. In this paper, a Locally Recurrent Neural Network (LRNN) trained according to a Recursive Back-Propagation (RBP) algorithm is investigated as an efficient tool for fast dynamic simulation. An application is performed with respect to the simulation of the non-linear dynamics of a nuclear reactor, as described by a simplified model of literature.
Źródło:: Journal of Polish Safety and Reliability Association; 2007, 1; 45--53
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Sensitivity analysis of a fuzzy expert system for modelling dependencies in human operators’ emergency tasks
Autorzy:: Zio, E.
Baraldi, P.
Librizzi, M.
Podofillini, L.
Dang, H. V.
Powiązania:: https://bibliotekanauki.pl/articles/2069589.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: human reliability analysis
fuzzy expert system
sensitivity analysis
Opis:: This paper analyzes the behaviour of a fuzzy expert system for evaluating the dependence among successive operator actions, through a sensitivity analysis on the fuzzy input partitioning and assessment. Preliminary results are presented with respect to a case study concerning two successive tasks of an emergency procedure in a nuclear reactor. Work is in progress to perform a thorough sensitivity analysis to generalize the results obtained.
Źródło:: Journal of Polish Safety and Reliability Association; 2007, 2; 379--389
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Performance analysis of a power transmission system under uncertain load conditions and network configurations
Autorzy:: Zio, E.
Piccinelli, R.
Delfanti, M.
Olivieri, V.
Pozzi, M.
Powiązania:: https://bibliotekanauki.pl/articles/2069672.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: vulnerability
electric power transmission network
load flow
power flow betweenness centrality
uncertainty
Opis:: In this paper, the load flow problem in a power transmission network is studied in presence of load and Power generation uncertainties and transmission lines failures. Network performance indicators are computed and the importance of the different components is evaluated by a power flow betwenness centrality measure.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 1; 279--284
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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