الفهرس 
ANALYSIS OF AVAILABILITY AND RELIABILITY OF k-OUT-OF-n: F MODEL WITH FUZZY RATESOnly 14 pages are availabe for public view
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Abstract
Reliability is considered to be one of the most quality characteristics of<technical systems. Reliability is theoretically defined as the probability that an item performs its required function for a stated service time under’ stated condition. Areliability has longtime been an important issue in’ the manufacturing indu~try, repairable system, multiprogramming system, parallel redundant system, power plants, etc. Achieving a high or required level of reliability is often an essential requisite. Availability is a measure of the degree to which an item is in an operable state at the start of a mission, when the mission is called for at an unknown time. Availability is defined as the probability that the system is capable of conducting its required function when it is called upon given that it is not failed or undergoing a repair action. Therefore, availability is not only a function of reliability, but it is also a function of maintainability. In other words, the reliability focuses on a period of time when the system is free of failures, but the availability concerns a time at
which the system does not stay at the failed state.