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...

Tires represent a critical spare part in mines. There is a shortage of medium and large tires. In addition, with increased mining activities and the creation of new mines, the demand for tires has increased significantly. Thus, it is particularly important for mining engineers to identify tire characteristics and correctly manage the spare part inventory. Spare parts management is critical from...

tires represent a critical spare part in mines. there is a shortage of medium and large tires. in addition, with increased mining activities and the creation of new mines, the demand for tires has increased significantly. thus, it is particularly important for mining engineers to identify tire characteristics and correctly manage the spare part inventory. spare parts management is critical from...

The path-segment-protecting p-cycles (“flow p-cycles” for short) have capacity efficiency near that of the Shared Backup Path-Protection (SBPP) scheme currently favoured for optical networking. In this paper a significant extension to the method of p-cycle is introduced for network protection. The Flow p-cycle is use to protect path segments of adjacent workingflow, directly straddle the p-cycl...

We examined the effects of Kelley's "warm/cold" manipulation on first impressions of persons and teaching ability. A stimulus person, posing as a visiting professor, gave a "neutral" lecture to 240 university students. Before the stimulus person appeared, half of the subjects received information that he was a rather warm person, whereas the other half was told that he was a rather cold person....

A new parameter is introduced for modeling the reliability of systems with standby spares. Dependability, d, is defined as the conditional probability that the checker reports a module as good given that the module is good. The trade-off between the number of spares and dependability then is examined.

We describe two simulation models for repair processes of aircraft in the Navy, and suggest ways to reduce cycle time and improve readiness. The models illustrate the e ects of material availability and process redesign on repair cycle time and work-in-process inventory levels for critical components. Our results indicate that the Navy could signi cantly reduce repair cycle times of those compo...

There are two effective ways to maintain the system to perform a high or required level of reliability and availability: one is spare units for key units; the other is several maintainers for the system. To solve reliability indexes of complex mechanical system under these assumptions, a system model was established, which consists of two dissimilar subsystems in series and each subsystem is wa...