Abstract This paper addresses the efficiency measurement of firms composed by multiple components, and assessed at different decision levels. In particular it develops models for three levels decision/production: subunit (production division/process), DMU (firm) industry (system). For each level, inefficiency is measured using a directional distance function developed measures are contrasted wi...

The paper considers reliability analysis for aging multi-state system where the system and its components can have different performance levels ranging from perfect functioning to complete failure. Aging is treated as failure rate increasing during system lifetime. Reliability measures for multi-state system such as mean accumulated performance deficiency, mean number of failures, average avail...

A lot of complex sytems (Operation Systems, Database systems, Distributed Systems, Information Systems, etc. ) is possible describe, form the point of view of reliability, like the Multi-State Systems. The Multi-State System is investigated in this paper as an object of reliability analysis. In this case system and its component may experience more than two states of reliability as opposed to t...

A model-based evaluation of a system’s design often considers to what degree components need to be available multiple times in order to reach a desired level of availability, reliability or dependability. Multiple components of the same kind then lead to models with regular structures. In stochastic models, especially Markovian models, such regularities have been studied for a long time and are...

This paper considers a problem of multi-state system reliability modelling and assessment. By using the advantages of uncertainty reasoning and figurative expression of Bayesian network, a new method of modelling and assessment of multi-state system reliability based on BN is proposed to determine the nodes of BN and the multiple states of components of system, and to give the probability of ea...

The sensitivity analysis of complex industrial systems aims at identifying, in a multi-unit structure, which components contribute the most to a variation of the performance criterion. In this paper an importance factor, called multi-directional sensitivity measure, defined as the derivative of the performance in the direction of one parameter, in the direction of a group of parameters (failure...

Close control of blood glucose levels significantly reduces vascular complications in diabetes, as well as having beneficial effect for cardiac and other critical care patients. Recent studies have shown that tight regulation of blood glucose level in intensive care unit patients can reduce mortality by as much as 45%. This paper presents an optimal insulin infusion algorithm to tightly regulat...

This paper develops an efficient heuristic to solve the non-homogeneous redundancy allocation problem for multi-state series-parallel systems. Non identical components can be used in parallel to improve the system availability by providing redundancy in subsystems. Multiple component choices are available for each subsystem. The components are binary and chosen from a list of products available...