Assuming exponential lifetime and repair time distributions, we study the limiting availability A? as well per unit time-limiting profit ? of a one-unit system having two identical, cold standby spare units using semi-Markov processes. The failed is repaired either by an in-house repairer within patience T or external expert who works faster but charges more. When there are facilities, allow re...

We propose a method that can be used when deciding on how to maintain capital goods, given a product design and the layout of a repair network. Capital goods are physical systems that are used to produce products or services. They are expensive and technically complex and have high downtime costs. Examples are manufacturing equipment, defense systems, and medical devices. Due to the high downti...

In this paper, a new model has been presented to determine the number of spare transformers and their locations for distribution stations. The number of spare transformers must be so that they need minimum investment. Furthermore, they must be sufficient for replacing with transformers that have been damaged. For this reason, in this paper a new purpose function has been presented to maximize p...

Multi-unit parallel production systems (MuPPSs) widely exist in many industry areas. A general requirement for the MuPPS is that each system should continuously run and its downtime be as short feasible. For such systems, optimising preventive maintenance (PM) policy crucial so resources number of spare units repairmen can optimally used. On this basis, paper develops an optimal model jointly P...

predicting the maintenance and management costs and replacement age of tractors in agricultural mechanized units, is important from several points. so, doing a timely agricultural operations, more accurate measure of the amount of income  including the cost of these items , determining the useful life of old tractors , replacement age, cost of the process changes and the possibility of examinin...

This paper proposes a means of using the knowledge in a network to determine the functionality or relevance of individual units, both for the purpose of understanding the network's behavior and improving its performance. The basic idea is to iteratively train the network to a certain performance criterion, compute a measure of relevance that identifies which input or hidden units are most criti...

We study a one-unit repairable system, supported by two identical spare units on cold standby, and serviced types of repairers. The model applies, for instance, to ANSI (American National Standard Institute) centrifugal pumps in chemical plant. failed unit undergoes repair either an in-house repairer within random or deterministic patience time, else visiting expert repairer. repairs one all be...

A three-dimensional, self-reconfigurable structure is proposed. The structure is a fully distributed system composed of many identical 3-D units. Each unit has functions of changing local connection, information processing, and communication among neighborhood units. Groups of units cooperate to change their connection so that the shape of the whole solid structure transforms into arbitrary sha...

Predicting the maintenance and management costs and replacement age of tractors in agricultural mechanized units, is important from several points. So, doing a timely agricultural operations, more accurate measure of the amount of income  including the cost of these items , determining the useful life of old tractors , replacement age, cost of the process changes and the possibility of examinin...