[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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This paper reviews a general strategy for testing core-based system-on-a-chip designs. The strategy includes isolating cores from each other to reduce total test complexity, using the best method for testing each individual core, and starting test development for a core early in its design flow. This paper can help design engineers better understand test issues in order to make SoC development successful.

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We develop a simulation system to support maintenance decision for multi-unit system. For given maintenance(inspection) intervals of units, the simulation system produces estimators of system availabilities and total operating costs. Various system structures, series, parallel, and standby, are studied. Spare parts and maintenance engineers are considered as system constraints. An example is also included.

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The article considers an estimation problem of repairable units. The failure time of each unit follows a Weibull distribution and units are imperfectly repaired on failures. The parameters of a Weilbull distribution and maintenance effects are estimated by maximum likelihood method. A new search technique is presented. Simulation is used to illustrate the accuracy of the proposed method.

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