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,whereUP /âFPâŞFM. Itmayseemoddthat thedispatcherreturnsanunknownresultUP.
Incausalmodeling,weexpresswithanunknownvariableUP thatwedonotexplainhow
it is caused.
OutgoingmessageMâ˛. Previously, thedispatcherPhas selected thecorresponding lo-
cal operation according to the operation speciďŹedwithin themessageM. The outgoing
messageMⲠcontains the result of the executionof theoperationop,whichwedeďŹneas
the followingequation.
MⲠ:= fMâ˛(P,M,UMâ˛)
:= {
R , ifP=opâ§opâM
UMⲠ, 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
variableUMâ˛whichsays thatwedonotdetermine itsvalue fromthecausalmodel.
Discriminator D. Finally, the discriminator identiďŹes whether the outgoing mes-
sageMⲠis theoperationâs result or anunknowndispatcherâs result.
D := fD(Mâ˛,UD)
:= {
1 , ifMâ˛=R
0 ,otherwise
The discriminator returns 1, ifMⲠresults from the operation execution. Therewith, the
discriminatorestablishes thedependencebetweenincomingandoutgoingmessage.Note
thatwedonotneedtoknowtheconcrete resultof theoperationexecution. In thismodel,
theoperation resultRonly identiďŹes itsorigin.
Graphicalmodel. Finally, everySCMis associatedwith a graphical causalmodel, or
simplyagraph.Thegraphâsnodes represent thevariablesV andU from table1and the
edges represent the structural equation inE. The ďŹgure 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
- Title
- Intelligent Environments 2019
- Subtitle
- Workshop Proceedings of the 15th International Conference on Intelligent Environments
- Authors
- AndrĂŠs MuĂąoz
- Sofia Ouhbi
- Wolfgang Minker
- Loubna Echabbi
- Miguel Navarro-CĂa
- Publisher
- IOS Press BV
- Date
- 2019
- Language
- German
- License
- CC BY-NC 4.0
- ISBN
- 978-1-61499-983-6
- Size
- 16.0 x 24.0 cm
- Pages
- 416
- Category
- Tagungsbände