This paper discusses an optimal burn-in procedure to minimize total costs based on the assumption that the failure rate pattern follows a bimodal mixed Weibull distribution. The procedure will consider warranty period as a factor of the total expected burn-in cost. A cost model is formulated to find the optimal burn-in time that minimizes the expected burn-in cost. Conditional reliability for warranty period will be discussed. An illustrative example is included to show how to use the cost model in practice.

Abstract
 1. Introduction
 2. Bimodal Mixed Weibull Distribution
  2.1. Time Dependent Conditional Reliability
 3. Cost model under warranty
 4. Optimizing expected total cost
 5. An Illustrative example
 6. Conclusion
 BIBLIOGRAPHY

• Kuinam J. Kim
• Chiyeon Park
• Changeui Hong