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PROBLEM TO BE SOLVED: To efficiently discriminate the classification of a gas appliance during use and a gas leakage with high accuracy.
SOLUTION: Noise of instantaneous flow data measured by a flow measuring means 11 is eliminated by a flow data noise eliminating means 21, and data of a change part and a flat part of flow is extracted by a flow data object extracting means 22. The \"length\" of the change part of flow, \"initial flow,\" \"a row of transition regions,\" the \"length\" of a flat part of flow, \"average value\" and \"inclination\" are extracted by a gas flow feature extracting means 31. A rule coincidence retrieving and point adding means 43 of an appliance determination means 41 retrieves a rule with the feature data coinciding with the features of the change part and flat part of flow and adds points at every classification of the gas appliance and every gas leakage. An appliance-in-use determination means 44 determines that the gas appliance of that classification is during use and outputs appliance classification information as determined results.
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