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The mathematical support of functioning of intellectual agents of activity planning on the basis of ontologies was developed, which allowed to formalize their behavior in the space of states. Using ontologies allows to narrow the search way from the initial state to the state of the goal, rejecting irrelevant alternatives. Such approach made it possible to reduce the task of planning the activities of the intellectual agent to the problem of dynamic programming, where the goal function is the composition of two functions that specify competitive criteria. Using the developed method, the calculation of the necessary costs for pipeline modernization and the expected economic effect from their application were made.
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