Due to the increasing need to distributed energy resources in power systems, their problems should be studied. One of the main problem of distributed energy resources is unplanned islanding. The unplanned islanding has some dangers to the power systems and the repairman which are works with the incorrect devices. In this paper, a passive local method is proposed. The proposed method is based on...

The importance in promoting, sustaining industries, manufacturing systems and economy through reliability measurement has become an area of interest. Reliability is one of the most important factors in any successful industries and manufacturing settings. In this paper, we study the reliability of three different repairable redundant network flow systems. First order differential equations meth...

ooesn't ~rt 1xlsiness idea! Swedish Telecan tJI:psala Sweden Who can afford handmade cars today? What would the term "just-in-tilre" mean today if the developnent of "carmanU£acturing" had been handled as the developnent of "systemnanU£acturing"? can the user afford those who know everything? Is it m::>re skillful to "mend" a systen. than construct? What if you, everytilre you leave your car to...

In this paper, repairable k – out – of – n:F system with single repairman is studied. The failure and repair times of components are assumed as geometric distribution which is one of the discrete distributions. Both the generalized and steady state transition probabilities of the states for the related system are obtained. The recursive relations for the reliability of the system are generated....

In this paper, a new kind of repairable system with repairman vacation and warning device is discussed, in which the delayed vacation rate and failure rates are functions related to system working time. The system model is established by using probability analysis method, which then is translated into a initial value problem of a class of abstract semi-linear evolution equation in a suitable Ba...

Supermarket models are a class of interesting parallel queueing networks with dynamic randomized load balancing and real-time resource management. When the parallel servers are subject to breakdowns and repairs, analysis of such a supermarket model becomes more difficult and challenging. In this paper, we apply the mean-field theory to studying four interrelated supermarket models with repairab...

We consider a machine repair problem with queue-dependent heterogeneous repairmen. The stationary probability distribution of the number of failed machines in the system is derived. A profit model is developed to determine the optimal values of threshold to assign/add one more repairman for increasing the total service rate where the service rate is assumed adjustable. The probabilistic global ...

We study a two-unit cold standby system in steady-state. The online unit goes through a finite number of stages of successive degradation preceding the failure. The units are reparable, there is a repairman and two types of maintenance are considered, preventive and corrective. The preventive repair aims to improve the degradation of a unit being operative. The corrective repair is necessary wh...

An online problem is one that must be ”solved” without knowing the future or without having complete information. One common approach to evaluating strategies for such problems is to assume a specific stochastic model of the unknown and use various probabilistic tools. Another approach, sometimes called competitive analysis, and related to min-max strategies in game theory, evaluates strategies...