In the world of integrated circuits, it is very important to manufacture products with high reliability and high durability. Especially for the decades-long life cycle required in industrial environments, reliability and durability have become key indicators. Whether from the knowledge level or the intuition level, the facts tell us that the more variables there are in a problem, the more complicated the result of the problem. Or, from a system perspective, the more components a system has, the more vulnerable points there are.