This paper considers an important concept which suggested to take stock of the over estimation in reliability characteristics or under estimation of hazard rate. Using this concept, the study considers the analysis of the reliability characteristics of an exponential lifetime model when prior variations in its parameters are suspected.

Operational profile is often used in software reliability testing, but it is limited to non-obvious-operation software such as Autonomous Control System. After analyzing the autonomous control system and scenario technology, a scenario-based profile constructing method for software reliability testing is presented. Two levels of scenario-based profile in the paper are introduced: system level a...

This paper proposes a single-loop system reliability based design optimization (SRBDO) approach using the recently developed matrix-based system reliability (MSR) method. A single-loop method was employed to eliminate the inner loop of SRBDO that evaluates probabilistic constraints. The MSR method computes the system failure probability and its parameter sensitivities efficiently and accurately...

Often a rule-based system is tested by checking its performance on a number of test cases with known solutions, modii~’ing the system until it gives the correct results ibr all or a sufficiently high proportion of the test cases. However, the performance on the test cases may not accurately predict performance of the system in actual use. In this paper we discuss why this testing method does no...

Reliability of a power system is considerably influenced by its equipments. Power transformers are one of the most critical and expensive equipments of a power system and their proper functions are vital for the substations and utilities. Therefore, reliability model of power transformer is very important in the risk assessment of the engineering systems. This model shows the characteristic...

Human factors are among the main elements affecting the reliability of nondestructive examinations (NDE). In a man-machine system, human reliability is affected by many factors (performance shaping factors) whose influence on reliability cannot be easily expressed quantitatively. This paper identifies and ranks 59 perform-ance shaping factors by using a fuzzy reasoning method and proposes a pro...

one of the most important problems in the system reliability optimization is redundancy allocation problem that has been studied in different system configurations. k-out-of-n structure is a general system configuration and offers enhanced capabilities for analyzing more design problems. hence, in this paper, the redundancy allocation problem of k-out-of-n systems is studied. in the most previo...

Deregulation policy has caused some changes in the concepts of power systems reliability assessment and enhancement. In this paper, generation reliability is considered, and a method for its assessment using intelligent systems is proposed. Also, because of power market and generators’ forced outages stochastic behavior, Monte Carlo Simulation is used for reliability evaluation. Generation r...

In general fuzzy sets are used to analyze the fuzzy system reliability. Here intuitionistic fuzzy set theory for analyzing the fuzzy system reliability has been used. To analyze the fuzzy system reliability, the reliability of each component of the system as a triangular intuitionistic fuzzy number is considered. Triangular intuitionistic fuzzy number and their arithmetic operations are introdu...