pdf download - Software and Computer Technology - TU Delft
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Glossary of terms<br />
• Model: an abstract representation of a system from a particular viewpoint, chosen by the<br />
modeler (in this thesis, the model can be both written down on some medium, or could remain<br />
only in the knowledge of an individual).<br />
• Model-Based Diagnosis (MBD): a reasoning technique to isolate root causes of failures, that<br />
uses a clearly separated model of a system.<br />
• Modality: diagnostic equipment that uses a medical imaging technique, such as X-ray, Nuclear<br />
Medicine, ultrasound <strong>and</strong> MRI.<br />
• Motor/Brake Unit (MBU): FRU of Philips C/V X-Ray System. This component consists of<br />
a motor <strong>and</strong> a brake. The motor is the actuator of the mechanical movement of the frontal<br />
st<strong>and</strong>.<br />
• Motor Voltage Regulator (MVR): hardware unit that controls the current <strong>and</strong> voltage towards<br />
the motor.<br />
• Nominal behavior: the intended behavior of the system.<br />
• Observability: the extent to which internal states of a system can be inferred by knowledge<br />
of its external outputs.<br />
• Observable: a property of the system that can be observed.<br />
• Online inference: the MBD model is solved for h, using realtime observations, at the moment<br />
fault diagnosis is performed.<br />
• Off-line inference: the MBD model is solved for h, using expected observations, priori to the<br />
moment that fault diagnosis is performed.<br />
• PCI: Peripheral Component Interconnect. This is the most common I/O bus in use today.<br />
It provides a shared data path between a number of peripheral controllers in an embedded<br />
system.<br />
• Philips: One of the world’s biggest electronics companies (Royal Philips Electronics).<br />
• Philips Cardio-Vascular X-Ray System: the Cardio-Vascular X-Ray System that is developed<br />
<strong>and</strong> serviced by Philips Medical Systems.<br />
• Philips Medical Systems (PMS): a subsidiary of Philips that develops, sales <strong>and</strong> services a<br />
wide range of medical systems.<br />
• Power-On-Self-Test (POST): a test of one FRU that is automatically performed at startup.<br />
• Potentiometer: component of the Philips C/V X-Ray System (not a FRU), used as a position<br />
sensor for various mechanical movements.<br />
• Potmeter/Encoder Unit (PEU): FRU of Philips C/V X-Ray System that consists of a Potentiometer<br />
<strong>and</strong> an encoder. ]<br />
• Power Distribution Unit (PDU): most important power supply of the Philips C/V X-Ray<br />
System. This FRU is used in the power supply example; it provides voltage.<br />
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