Reliability Assurance System Using Large Scale Multi-Media Databases and its Application

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Results are summarized into the following four categories :1.System for Sharing Information to Prevent Reliability and Safety ProblemsTo prevent problems in reliability and safety, collection and analysis of data, integration of information through databases, and their application on the actual spot play important roles. Researches on management aspect, human aspect and hardware aspect are implemented and systems for sharing information for reliability and safety are proposed.2.Design of Lifetime Evaluation and Its Distributional FormAn optimal design for binary lifetime experiment is developed which attains the highest precision of the estimation from D-optimal criterion. Also its sequential design is investigated. It becomes clear that the distributional form of an electro-migration of LSI follows a log-normal distribution, not Weibull distribution.3.Condition Monitoring Maintenance Aiming Utilization of Multi-media InformationCondition monitoring maintenance using sensors plays impo … More rtant roles for reliability and safety assurance. But a sensor has two failure modes : false alarm and failure to alarm. To decrease these failures, a k-out-of-n alarm decision system prevails. This research investigates the optimality of equal thresholds of all sensors for alarming, validity of self-moving sensors, and the thresholds with gray zone areas.4.Lifetime Data Analysis Based on Large Scale DatabasesNowadays databases of field reliability data have been spreading all over the world and getting larger and larger. Mainly these data come from repair records during product warranty period in each division. To the contrary, sales amount information comes from the databases of sales department. It is necessary to combine these two different databases for estimating lifetime parameters. It is necessary to combine these two different databases fro estimating lifetime parameters. Also, sometimes, sales amount of each month is missing and just total sales amount of the products are known. This research tackles with those problems and develops the methods of lifetime data based on large scale databases. Less