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,whereUP /âFPâȘFM. Itmayseemoddthat thedispatcherreturnsanunknownresultUP.
Incausalmodeling,weexpresswithanunknownvariableUP thatwedonotexplainhow
it is caused.
OutgoingmessageMâČ. Previously, thedispatcherPhas selected thecorresponding lo-
cal operation according to the operation speciïŹedwithin themessageM. The outgoing
messageMâČ contains the result of the executionof theoperationop,whichwedeïŹneas
the followingequation.
MâČ := fMâČ(P,M,UMâČ)
:= {
R , ifP=opâ§opâM
UMâČ , otherwise
,whereR=op(M) is the result of the operation op taking the arguments from the in-
comingmessageM. If opwas not known to the dispatcher, the result is the unknown
variableUMâČwhichsays thatwedonotdetermine itsvalue fromthecausalmodel.
Discriminator D. Finally, the discriminator identiïŹes whether the outgoing mes-
sageMâČ is theoperationâs result or anunknowndispatcherâs result.
D := fD(MâČ,UD)
:= {
1 , ifMâČ=R
0 ,otherwise
The discriminator returns 1, ifMâČ results from the operation execution. Therewith, the
discriminatorestablishes thedependencebetweenincomingandoutgoingmessage.Note
thatwedonotneedtoknowtheconcrete resultof theoperationexecution. In thismodel,
theoperation resultRonly identiïŹes itsorigin.
Graphicalmodel. Finally, everySCMis associatedwith a graphical causalmodel, or
simplyagraph.Thegraphâsnodes represent thevariablesV andU from table1and the
edges represent the structural equation inE. The ïŹgure 3 depicts the graphical causal
modelof themessagepassingbehaviorof interoperableprocesses.
Figure3. Graphical causalmodelof themessagepassingbehaviorof interoperableprocesses
S. Kotstein and C. Decker /AnApproach for Measuring IoT
Interoperability176
Intelligent Environments 2019
Workshop Proceedings of the 15th International Conference on Intelligent Environments
- Titel
- Intelligent Environments 2019
- Untertitel
- Workshop Proceedings of the 15th International Conference on Intelligent Environments
- Autoren
- Andrés Muñoz
- Sofia Ouhbi
- Wolfgang Minker
- Loubna Echabbi
- Miguel Navarro-CĂa
- Verlag
- IOS Press BV
- Datum
- 2019
- Sprache
- deutsch
- Lizenz
- CC BY-NC 4.0
- ISBN
- 978-1-61499-983-6
- Abmessungen
- 16.0 x 24.0 cm
- Seiten
- 416
- Kategorie
- TagungsbÀnde