A Study of Estimation Methods for Reliability of Common Cause Failure at k-out of-n System

Abstract

Abstract. System lifespan modeling becomes more complicated when an external event causes the succession of failure in 2 or more system components. Models that don't consider this common cause failure cause the wrong estimation of system reliability. Let us assume that there are data composed of numbers of successive failures in i, i = 1, … , n out of n components of system. Data having these characteristics are closely related with the number of system components. This is a problem occurring frequently in the estimation of reliability with respect to environmental change among components in various systems. This paper is intended to examine the estimation methods of reliability for common cause failure at k-out of-n system.

Evaluation of Apical Transportation by Three Rotary Systems in Extracted Teeth with Curved Canals

“…These instruments are more resistant to torsion and cycle fatigue and factors that cause fracture of the instruments, and allow a better conservation of the tooth structure during instrumentation because they follow the path with less resistance. These instruments were found to be successful in widening the root canals with complex anatomy (8,9). Hyflex CM design includes a triangular section, a variable helix angle, and an inactive tip, these instruments offers of 300-800% more resistance to fracture caused by fatigue cycle in comparison to the traditional NiTi files (10,11).…”