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The present invention relates to a method of diagnosing the lifetime of a structure and a system for diagnosing the same, the method comprises a step for preparing a structure to be measured; a step for measuring an amount of exothermic or endothermic heat of the structure; a step for measuring an amount of entropy decrease of the structure by using the measured amount of exothermic or endothermic heat; and a step for diagnosing the remaining lifetime of the structure from the measured amount of entropy decrease.