Knowledge modeling: Difference between revisions

Revision as of 05:41, 20 August 2007

Revision as of 13:21, 28 August 2007

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* steam shall be input in a heater

* condensate shall be output of a heater

* etc.<br />

The basis of a knowledge model of an assembly physical object is a decomposition structure that specifies the components of the assembly and possible the sub-components of the components.

For example, knowledge about a compressor system includes that a compressor system consists of a compressor, a lubrication system, etc, whereas a lubrication system consists of a pump system, etc. This means that a part of a knowledge model about a compressor system will contains the following specifications:<br />

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* compressor system shall have as part a lubrication system

* lubrication system shall have as part a pump system

* pump system shall have as part a pump<br />

Such a knowledge model will be further extended with knowledge and specifications about the properties of the components, their fabrications and possibly testing and maintenance requirements.

== Explicitation of document content ==

Knowledge modeling includes the explicitation of knowledge that is available in documents, such as design manuals, (international) standard specifications and standard data sheets. In order to make such knowledge computer interpretable it need to be transformed into a computer interpretable form. For example in the form of a system independent [[Gellish English]] expressions that canbe stored in a Database. The knowledge that is contained in documents can be modeled at various levels of explicitation. A low level of explicitation keeps large parts of the specifications in the form of natural langaugelanguage text. The extreme is that whole documents are related to an element in the knowledge model. For example, the knowledge that the API 617 standard contains a standard specification for centrifugal compressors can be linked to the concept compressor in the knowledge model of a compressor system as follows:<br />

* centrifugal compressor is specified in API 617<br />

A higher level of explicitation means that paragraphs or sentences in natural language are related to components in the knowledge model. A full explicit model means that the natural language sentences are completely transformed into data in a database structure.

For example, a specification of a minimum shaft diameter might be included in the knowledge model as follows:<br />

* shaft diameter shall have on scale a value greater than 20 mm<br />

The above described explicitation process results in Knowledge Models and Standard Specifications Models that enable their use for computer supported knowledge-aided design as well as for automated verification of designs.