Abstract: The invention relates to a floating impedance high voltage simultaneously test circuit, using two or more sets of conditions capable of simultaneously outputting different source signals to perform simultaneously the high voltage test and the low voltage DC impedance test, so that it is possible to simplify the test procedure of electric products, to reduce the poor yield of the facility, to reduce the test time, and to greatly increase the production efficiency; and to a method of performing the test.

Abstract: For mining causality rules in an event database, the rules are obtained by iteratively generating candidate rules and counting their occurrences in the event database. Newly identified causality rules are used to generate the next set of candidate rules to be evaluated, by increasing the size of the set of consequential events triggered by triggering events and/or the number of triggering events. The preferred embodiment uses an iterative approach to deriving the causality rules in order of the consequential set sizes and triggering set sizes. The detection of an occurrence of a causality rule in an event sequence is handled as a sub-sequence matching problem using a novel hierarchical matching method to improve efficiency.