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254 A Common Architectural Approach for IoT Empowerment
6.3.3 Functional Blocks and Basic Interfaces Among Them
For the sake of clarity, we split the description of functional blocks in three
subsections: Service Level, CVO Level, VO Level.
6.3.3.1 Service Level Functionality
Natural Language Processing (NLP) is the functional block that translates
non-technical user human language queries and statements into the formal
iCore service request SPARQL query. The Service Request Analysis comprises
the Service Analysis block which receives the SPARQL query and
asks for the retrieval (through the Intent Recognition) of the current situation
in which the query is performed. The Semantic Query Matcher comprises
semantic alignment/learning enhancements as a potential pre-processing for
the standard SPARQL matching of query to Service Template concept as done
in the RDF Rules Inference Engine. The outcome of the RDF Rules Inference
Engine is actually a logical mash-up of CVO-selection criteria (i.e. CVO Template
names, in its simplest form), called Service Execution Request, which
is to be handed over to the CVO Level for service execution. The Service
Execution Request is the final outcome of the Service Request Analysis and
comprises — apart from CVO-selection criteria — Service Level Agreement
(SLA) criteria that express quality demands and cost criteria.
The Service Template Repository contains a semantically query-able collection
of Service Templates, as provided in the repository by the Domain
Expert/Knowledge Engineer. The Intent Recognition comprises the cognitive
functionality that is used to determine what the Intent of the User is and
assists in identifying the “Monitoring Goals” (application specific) needed
for Situation Detection sub-block of the Situation Awareness block. The User
Characterisation comprises the determination of a range of facts concerning a
human user, including user context, profile, preferences and policies.
The Situation Awareness block is responsible for the creation of the
RWK info, which is then stored in the RWK model. The situational awareness
process is generated by a logical sequence of steps/sub-blocks namely
(i) Situation Detection (ii) Situation Recognition (iii) Situation Classification
and (iv) Situation Projection. Cognition adds the element of intelligence
which helps discerning the situation and thereby resulting action. Each of
the above sub-blocks follows the cognition cycle in terms of Perception