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Ontology Reuse In MBSE

Ontology Reuse In MBSE. Henson Graves January 2011. Outline. Examples of reuse of existing ontologies Potential reuse Opportunities What are the benefits Approaches to ontology reuse Some observations on reuse Next steps. Ontology Reuse In MBSE. Examples Units and measures

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Ontology Reuse In MBSE

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  1. Ontology Reuse In MBSE Henson Graves January 2011

  2. Outline • Examples of reuse of existing ontologies • Potential reuse Opportunities • What are the benefits • Approaches to ontology reuse • Some observations on reuse • Next steps

  3. Ontology Reuse In MBSE • Examples • Units and measures • Physical interactions (laws) • Material classification and properties • Enterprise concepts • Levels of rigor in ontologies • Vocabulary • Informal textual semantics of vocabulary • Formal (axiomatic) semantics

  4. Potential Reuse Opportunities Ontology for events Ontology for computational methods Ontology for experimental setups Ontology for system engineering artifacts Ontology for product structure and attributes Ontology for measurement value spaces

  5. Ontologies may be Organized into hierarchies Fundamental terms use in all projects, disciplines, and applications Foundation Ontologies Base, Mission, Project, Quantities-Units-Dimensions-Values, Analysis, Artifact, Architecture Description use Discipline Ontologies Mechanical, Electrical, Physics, Thermal, Propulsion, Attitude Control, Navigation, … Discipline-specific terms specified and owned by discipline experts use Focus is integration and interoperation Kinds of items that are modeled in a project; specified and owned by application experts use Application Ontologies Star Tracker, Sun Sensor, Reaction Wheel, Thruster,.. 2-axis vs. 3-axis S/C; Radio vs. optical comm; … Focus is reuse

  6. What Are The Benefits • Leveraging reusable knowledge to jump start engineering • Basis for model integration and large scale collaboration • Standardization of engineering work products

  7. Approaches To Achieving Reuse • Opportunistic Reuse: identify candidate ontologies, acquire and refurbish and make available • Designed Reuse: establish modeling principles and start over, making use of lessons learned

  8. Opportunistic Reuse • Identify candidate ontologies, acquire and refurbish and make available • Opportunistic reuse has only had limited success in • Hardware component design • Software design • Reuse only worked well when the right units of modularization were understood, e.g. ASICS, Patterns

  9. Designed Reuse Process • Collect any reuse ontology candidates • Document modeling principles to be used in redo • Chose a foundation (upper) ontology, e.g., DOLCE in accord with design principles • Modify if needed, based on experience • Create specializations of subsets of the upper ontology, e.g., • For physical laws, enterprise concepts • Repeat as needed

  10. Upper Ontology Concepts That Might Be Useful Classes Properties

  11. Example From Upper Ontologies That Is Particularly Useful: Qualities Physical Object hasQuality Quality Type inPounds Car Measured Weight 1D Space With units hasMeasuredWeight <mwt, 18k> Empty 1969 VW <Vw,mwt> Weight object 18K pounds

  12. Next Steps For Ontology Reuse Development • Get a working group established for this purpose • Collect any reuse ontology candidates • Document modeling principles to be used

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