This work deals with two models of a single machine subject to breakdowns. The first model is binary-state while the second one multi-state model. Breakdowns are followed by repairs. systems under study tracking type. We use nonlinear predictive control determine optimal repair rates that keep variables as close possible their target. Numerical illustrations sensitivity analysis used assess eff...

Accurate and reliable time is necessary for financial and legal transactions, transportation, distribution systems, and many other applications. Time synchronization protocols such as NTP (the Network Time Protocol) have kept clocks of such applications synchronized to each other for many years. Nowadays there are many commercial GPS based NTP time server products at the market but they almost ...

a single server queue with bernoulli vacation has been considered. in addition the admission to queue is based on a bernoulli process and the server gives two type of services. for this model the probability generating function for the number of customers in the queue at different server's state are obtained using supplementary variable technique. some performance measures are calculated. ...

Direct implicit simulation of complex steady state ows is usually too dii-cult numerically in the absence of a good initial guess. \Pseudo-transient-continuation" is a physically motivated technique that follows the physical transient solution starting from a uniform ow. Here, a delicate choice of the time steps, or the CFL numbers is crucial to reduce the number of iterations. However , existi...

It has been known for some time that non-destructive electric breakdowns precede destructive thermal dielectric breakdown. We have been studying both processes in oxides between 5 nm and 80 nm in thickness. We have shown that the electric breakdowns can trigger dielectric breakdown under certain conditions. This triggering of dielectric breakdown causes TDDB distributions to be nonunique. The T...

in this research, both resource allocation and reactive resource allocation problems in multi-server dynamic pert networks are analytically modeled, where new projects are expected to arrive according to a poisson process, and activity durations are also known as independent random variables with exponential distributions. such system is represented as a queuing network, where multi servers at ...