Ontology in Model-Based Systems Engineering. Henson Graves 29 January 2011. Preview Of Monday Discussion Topics. SysML and ontology in biomedical modeling Ontology reuse in MBSE Ontology for identifying and resolving model ambiguity
Ontology in Model-Based Systems Engineering
29 January 2011
SysML and ontology in biomedical modeling
Ontology reuse in MBSE
Ontology for identifying and resolving model ambiguity
Approaches to integrating SysML with logic based frameworks, e.g., OWL
Overlap with other MBSE working groups
Enterprise modeling (DoDAF, …
Issues, questions, what else is going on,…
SysML and Ontology in Biomedical Modeling
30 January 2011
Focus of conceptual modeling is on structure
Construct a model that captures what is common to all (or at least) most human hearts
corresponds to product model, or product line
Perform general reasoning about effects of pathology and disease symptom propagation
general properties of operation
Use general case to analyze and reason about a specific heart
Do the modeling principles used by Description Logic (OWL) community offer anything for MBSE?
Will these examples and the DL models help us understand how to integrate formal reasoning with SysML?
How do biomedical examples look in SysML?
Do the modeling principles used for air vehicles and other systems work in biomedical domain?
Ontology Reuse In MBSE
Units and measures
Physical interactions (laws)
Material classification and properties
Levels of rigor
Informal textual semantics of vocabulary
Formal (axiomatic) semantics
Common MBSE Modeling Questions and How Ontology Helps
January 10, 2011
Are the things described by a model all the same, or can they be different?
In particular, do they all have the same parts linked together in the same way?
The answer is no (perhaps intentionally) if
The model is incomplete.
Does a car have more than engines and wheels?
Are there any specializations of the model? Is there more than one model of the same car?
The model is complete, but isn’t specific.
What kind of engine? What kind of wheel? Which goes with which?
Parts aren’t distinguished or equated.
Does the car roll on the driven wheels?
Ontology languages enable modelers to say how they want these questions to be answered
Doesn’t mean system engineers need to learn ontology languages
Ontology languages can motivate and validate extensions to SysML/UML and other modeling languages to address ambiguities
Improves quality of communication between people, between people and machines, and between machines
Giving a model a descriptive name (“complete car model”) does not mean that people or machines know exactly what you are talking about.
Integrating SysML with OWL
(or other logic based formalisms)
Engineering has always been about
building models of real world domains,
analyzing models and making measurements
refining and modifying the models
Integrating a modeling language with logic-based system enables
Standardization of model semantics
Checking that model integration does not lead to inconsistency
Automated reasoning tools to perform tasks which outstrip manual capability
formal derivations for justification of engineering decisions
Constructions in logical language are given (axiomatic and/or referential) semantics, e.g.,
Codify expected properties of language constructions such as subclass, instance, part,…
Allow users as they model systems to not be dependent on subject matter experts to convey their meaning
Use automated reasoning, based on formal semantics, for consistency checking as models are developed and merged
Formal derivations (proofs) can provide justification for assumptions and decisions made on basis of models
Learn some logic based language, say FOL, or OWL and use that
recognizing that logic is primary
Translate SysML into OWL and back in so far as is possible
Switch back and forth
Provide SysML with a formal logical foundation
allow users to work within SysML and take advantage of reasoning tools
Data Interchange Format Standards
Resource Identification Standards
Increasing use of standards
To enable semantic interoperability