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We consider a class of population models, which will be named “two‐mode” and is suitable to represent phenomena characterized by the interaction of two compartment groups. The two groups, both containing the same number of compartments, may exhibit some difference in their behaviour (“mode”),...
This paper studies a system of parallel service facilities or processors with mixed exponential and non‐exponential queues, a non‐exponential finite source input and interdependent arrival as well as departure blocking such as due to a common pool or shared resource. A concrete invariance...
A study of glial tumours involving 192 cases is presented. Different issues are addressed: (i) the interrelationships between the histological variables, (ii) the problem of the prediction of the survival time, (iii) the causal role of the variables in the progress of the disease.
We deal with the problem of finding a suitable model to predict survival of patients suffering from glial tumours as a function of several covariates.
Phase‐type (PH) probability distributions provide a versatile class of distributions, and are shown to fit naturally into a Markovian compartmental system, where “individuals” or “particles” move between a series of compartments, so that phase‐type compartmental residence‐time distributions can...
In this paper we give a reliability analysis of a stand‐by system with repair, consisting of N working and NR stand‐by units. Failed and repaired units are collected in intermediate stocks. Concerning the delivery from the intermediate stocks we consider two rules: (i) the collected units are...
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