This report shows changes in the usage of research equipment by the concept and status of its physical lifespan.
The changes in equipment failure rates over time can be confirmed in ‘Failure Rate-Time Relationship according to Weibull Distribution.’ To facilitate understanding of the utilization of the repairable equipment, it was expressed in words and graphs. In addition, the facilities, which do not accumulate profit from a cost perspective such as research equipment, should be continuously used as long as they are valuable in terms of performance and application. It also includes the concept of physical lifespan.

Ⅰ. Concept of physical lifespan
Ⅱ. Concept comparison with various lifespan periods
Ⅲ. Warranty and paid repair
Ⅳ. Research equipment failure rates
Ⅴ. Changes in the conditions of research equipment
Ⅵ. Research equipment management and improvements