Relaxed Abduction: Robust Information Interpretation for by Thomas Hubauer

By Thomas Hubauer

Thomas Hubauer addresses the problem of delivering moderate interpretations of incomplete observational facts within the context of imperfect area versions – a scenario frequently encountered within the context of business diagnostics. To take on this challenge, the writer proposes a unique process referred to as comfy Abduction, which will derive pragmatic interpretations in events the place present equipment both fail or supply overly complicated ideas. to reinforce the hyperlink to functions in business diagnostics, he develops a technique to constitution analysis difficulties in keeping with ISO 13379 and exhibit it utilizing a number of description good judgment wisdom bases.

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1 suffice to establish two central properties of relaxed abduction, namely conservativeness and weak optimality. The fact that relaxed abduction conservatively extends standard logic-based abduction guarantees that, under natural conditions, our extended approach reproduces all solutions to the corresponding standard abduction problem. Intuitively, this means that no “perfect” solution explaining all observations is lost when applying the relaxation. 1 (Conservativeness of the relaxation) Let RAP = (T , A, O, A , O ) be a relaxed abduction problem, with the corresponding preferential abduction problem PrefAP = (T , A, O, A ).

This idea can be formally grounded within the notion of Pareto-optimality from the theory of economics. 1: Pareto-optimality and Dominance (i. e. either incomparable or worse), the strong notion demands a component being strictly better. 1 visualizes the different notions for total orders. In this example, the points A and B are both weakly and strongly Pareto-optimal, whereas C is weakly Pareto-optimal, but not strongly. Point D is said to be dominated by A (A is smaller than D in all dimensions).

Representing Diagnostic Knowledge Causal Modelling. Diagnostic knowledge represented causally is captured in an ontology Mcaus of axioms that have the form Sysi ∃ Rinfi . (∃ operatesIn . Fault ) j ∃ shows . 3: A hierarchy of diagnostic ontologies where C , r denote variables that range over concepts and roles respectively, Sysi is some system, Symi,j are concrete symptoms, and Rinfi is a relation expressing that one system influences another. We moreover require that Msys ∪ Mcust |= { Fault FaultMode, Symi,j Symptom, Rinfi isInfluencedBy}.

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