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Appendix A
Glossary of terms
In this appendix we give an overview of frequently used terms and abbreviations.
• Abduction: reasoning based on the principle of ’inference to the best explanation’.
• Abductive approach: an approach to fault diagnosis that defines a diagnosis as a set of
abnormality assumptions that covers (or, in terms of logic, implies) the observations. [18, 24]
• Abductive Model: see abductive approach. It is the part of the strong model that defines the
false modes of operation.
• Accuracy: the extent to which diagnoses agree with reality. Used as a criterion of diagnostic
performance in this thesis.
• Adaptability: a criterion of diagnostic performance that is used in this thesis, namely the
ability of a diagnostic process to cope with design changes of the target system.
• A priori probability: the probability that a component fails (h=0), without having made any
observations.
• Arm: term of mechanics that is defines as the distance between the centre of buoyancy and
the the lever’s fulcrum.
• Automated Fault Diagnosis: approaches to fault diagnosis, in which the interpretation of
system data to produce diagnoses is automated.
• Backpanel Control Unit: a FRU of the Philips C/V X-Ray system that is comparable with
the motherboard of a PC; by means of PCI it connects various hardware units.
• Beam propeller movement: a mechanical (rotational) movement of a stand of the Philips
Cardio-Vascular X-Ray System.
• Behavior: what the system does to implement its function, and is described by a sequence of
states [4].
• Black Box: A model that describes the externally observable behavior, but does not state
anything about the structure of the system or behavior of internal components of the system.
• Build-In-Self-Test (BIST): a test of one or more FRUs that can be performed in Field Service
mode.
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